PSG Section 16311A
INTEGRATED UNIT SUBSTATIONS (IUS) Secondary less than 1000 v
Section 16311A
section 16311A
INTEGRATED UNIT SUBSTATIONS (IUS) Secondary less than 1000 v
PART 1 General
1.01 Scope
A. The Contractor shall furnish and install the integrated unit
substation (IUS) complete from the incoming line terminals to the
outgoing line terminals as specified herein and as shown on the
contract drawings.
B. The integrated unit substation shall consist of primary
breaker, dry type transformer, & secondary main &
distribution sections as required. The manufacturer of the
integrated unit substation shall furnish and coordinate all major
components of the IUS, including incoming primary equipment
section, transformer and low-voltage section, as well as circuit
breakers, and metering components. Provide a single warranty
covering all substation assemblies, transformers and
components.
C. Connections between the primary device and transformer shall
be direct cable, and between the transformer and secondary shall be
flexible bus braid.1.02 Related Sections
A. Section 16426A Metal-Enclosed Drawout Switchgear (Magnum DS)
Low VoltageB. Section 16322B Substation Transformers Dry-Type
-- (OR --B. Section 16322C Substation Transformers Resibloc(
Cast Resin
-- (OR --
B. Section 16322D Substation Transformers Vacuum Cast-Coil
Design
1.03 References
A. The integrated unit substation shall be designed, assembled,
tested and installed in accordance with latest applicable standards
of NEMA, IEEE and ANSI, applicable to its three major sections:
1. MV Metal-Enclosed Switchgear NEMA SG4, SG5; ANSI C37.20.3
2. Secondary Substation Transformers NEMA 210, IEEE 100, ANSI
C57
3. LV Metal-Enclosed Switchgear ANSI C37.20.1, ANSI C37.51, UL
1558
1.04 Submittals for review/Approval
A. The following information shall be submitted to the
Engineer:
1. Master drawing index
2. Front view elevation
3. Floor plan
4. Single line
5. Schematic diagram
6. Nameplate schedule
7. Component list
8. Conduit entry/exit locations
9. Assembly ratings including:
a. Short-circuit rating
b. Voltage
c. Continuous current
d. Basic Impulse level for equipment over 600 volts
e. kVA
10. Major component ratings including:
a. Voltage
b. Continuous current
c. Interrupting ratings
11. Cable terminal sizes
12. Connection details between close-coupled assemblies
13. Composite front view and floor plan of close-coupled
assemblies
14. Impedance for transformers
15. Product data sheets
B. Where applicable, the following additional information shall
be submitted to the Engineer:
1. Busway connection
2. Key interlock scheme drawing and sequence of operation
1.05 Submittals for CONSTRUCTION
A. The following information shall be submitted for record
purposes:
1. Final as-built drawings and information for items listed
Paragraph 1.04, and shall incorporate all changes made during the
manufacturing process
2. Wiring diagrams
3. Certified production test reports
4. Installation information
5. Seismic certification as specified
1.06 Qualifications
A. The manufacturer of the assembly shall be the manufacturer of
the major components within the assembly.B. For the equipment
specified herein, the manufacturer shall be ISO 9001 or 9002
certified.C. The manufacturer of this equipment shall have produced
similar electrical equipment for a minimum period of five (5)
years. When requested by the Engineer, an acceptable list of
installations with similar equipment shall be provided
demonstrating compliance with this requirement.D. (Provide Seismic
qualified equipment as follows:
1. The equipment and major components shall be suitable for and
certified by actual seismic testing to meet all applicable seismic
requirements of the 2006 International Building Code (IBC).
Equipment certification acceptance criteria shall be based upon the
ability for the equipment to be returned to service immediately
after a seismic event within the above requirements without the
need for repairs.
2. The following minimum mounting and installation guidelines
shall be met, unless specifically modified by the above referenced
standards.
a. The Contractor shall provide equipment anchorage details,
coordinated with the equipment mounting provision, prepared and
stamped by a licensed civil engineer in the state. Mounting
recommendations shall be provided by the manufacturer based upon
the above criteria to verify the seismic design of the
equipment.
b. The equipment manufacturer shall certify that the equipment
can withstand, that is, function following the seismic event,
including both vertical and lateral required response spectra as
specified in above codes.
c. The equipment manufacturer shall document the requirements
necessary for proper seismic mounting of the equipment. Seismic
qualification shall be considered achieved when the capability of
the equipment, meets or exceeds the specified response spectra.
1.07 Regulatory Requirements
A. Certified copies of production test reports shall be supplied
demonstrating compliance with these standards when requested by the
engineer.
1.08 Delivery, Storage and Handling
A. Equipment shall be handled and stored in accordance with
manufacturer's instructions. One (1) copy of these instructions
shall be included with the equipment at time of shipment.
1.09 Operation and Maintenance Manuals
A. Equipment operation and maintenance manuals shall be provided
with each assembly shipped and shall include instruction leaflets,
instruction bulletins, and renewal parts lists where applicable for
the complete assembly and each major component.
PART 2 PRODUCTS
2.01 Manufacturers
A. Eaton
B. (__________
C. (__________
The listing of specific manufacturers above does not imply
acceptance of their products that do not meet the specified
ratings, features and functions. To eliminate possible disputes
between circuit breaker and switchgear coordination, the
manufacturer of the switchgear shall also be the manufacturer of
the circuit breaker. Manufacturers listed above are not relieved
from meeting these specifications in their entirety. Products in
compliance with the specification and manufactured by others not
named will be considered only if pre-approved by the Engineer ten
(10) days prior to bid date.
2.02 PRIMARY EQUIPMENT (5KV & 15KV CLASS)
A. The primary section described in this specification shall be
designed for operation on a ([2.4] [3.3] [4.16] [4.8] [6.9] [7.2]
[8.4] [11] [11.5] [12] [12.47] [13.2] [13.8] [14.4] kV, 3-phase,
([3] [4] wire, ([solidly grounded] [ungrounded] [low impedance
grounded] [high impedance grounded], ([50][60] Hertz system.
B. The primary section main bus (when applicable) shall be rated
([600A] [1200] amperes. The primary section shall be constructed so
that all buses, bus supports and connections shall withstand
stresses that would be produced by fault currents equal to the
close and latch rating of the circuit breakers. The short time
short circuit current withstand capability of the busses shall be
the same as that of the primary circuit breakers. The temperature
rise of the bus and connections shall be in accordance with IEEE
standard C37.20.3 and C37.20.2, and documented by design tests. The
primary equipment compartment (5kV or 15kV), including all busses,
breakers, and instrument transformers, shall be completely isolated
from the secondary equipment compartment (600VAC) by means of
grounded steel or glass polyester barriers. The primary section
shall be located in the lower half of the IUS structure, with the
secondary main section located in the top half of the IUS
structure. Each primary circuit breaker load side studs shall be
equipped with insulated copper extension buses terminating in
solderless type terminals in the rear cable compartment for direct
cable connection to the transformer. Incoming primary cables shall
enter the IUS structure from the [top via steel wireways into the
lower primary termination compartment.] [bottom. Additional space
underneath the IUS structure may be required for stress cone
connection for bottom incoming cable]
C. Each primary circuit breaker shall have the following
ratings:
Note to Spec. Writer: Insert PRIMARY circuit breaker ratings
below from Table 16347C-1
Rated Maximum Voltage
(______kV1-minute Power Freq withstand voltage(______kV
RMSImpulse withstand voltage (BIL)
(______kV Peak
Continuous Current
As shown on drawings Rated Short-Circuit Current at Rated
Maximum Voltage
(______kA RMS Sym.Rated Voltage Range Factor K
1.0Maximum symmetrical Interrupting and 2-Sec short-time current
carrying
capability
(______kA RMS Sym
Closing and Latching Capability
(______kA peak3-Phase MVA at rated maximum voltage.(______ Rated
Interrupting Time
5 Cycle
Table 16347C-1
Rated Maximum Voltage
1-minute Power Frequency withstand voltageImpulse withstand
voltage (BIL)Rated Short Circuit Current at Rated Maximum
VoltageRated Voltage Range FactorMaximum Sym. Interrupting and
2-second Short Time Current Carrying CapabilityClosing and Latching
Capability (Momentary)3-phase MVA at rated maximum voltage (for
reference only)
VIKK * I2.6 * K * I
kV RMSKV RMSkV peakkA RMS symkA RMS symkA CrestMVA
4.761960161.016 42130
4.761960201.020 52165
4.761960251.025 65210
15.03695161.016 42420
15.03695201.020 52520
15.03695251.025 65650
D. Primary Circuit Breaker
1. The primary circuit breaker shall utilize vacuum interrupters
for interruption and switching functions. The current transfer
between the circuit breaker and phase conductors in the compartment
shall be via heavily silver plated and spring loaded copper finger
cluster (phase disconnect) on the breaker, and rigidly mounted
silver plated copper stabs within the insulated housing mounted on
the compartment wall. The current transfer from vacuum interrupter
moving stem to the primary disconnect cluster on the breaker shall
be non-sliding type via heavily silver or tin plated flexible
copper leaf conductors attached on each end.
2. Each primary circuit breaker shall be supplied with contact
surface erosion (contact wear) indicator that requires no tools or
measurements for the checking of the contact surface erosion.
3. Each primary circuit breaker shall be equipped with
high-speed stored energy operating mechanism and shall permit
open-close-open (OCO) operating sequence without recharging the
closing springs.
4. The primary breaker front panel shall be removable when the
compartment door is open for ease of inspection and maintenance of
the mechanism.
5. Each primary circuit breaker shall be equipped with
mechanical operations counter on the front of the breaker to
provide record of the number of circuit breaker operations.
6. Each primary circuit breaker shall include contacts
Open/Close and spring Charged/Discharged status indications on the
front of the breaker.
7. Each primary circuit breaker shall be supplied with an
auxiliary switch with 5 NO and 5 NC contacts. The switch shall be
heavy duty, double break type with wipe type contacts. All unused
contacts from this switch shall be wired out to terminal blocks for
owners use.
8. Primary circuit breakers shall be manually operated (MO)
unless shown on the drawings as electrically operated (EO). Energy
required for closing and opening of the circuit breaker shall be
provided by manual charging of springs. The spring charging handle
shall be integral to the circuit breaker and conveniently located
on the front of the circuit breaker.
9. Each primary circuit breaker shall be supplied with Manual ON
and OFF push buttons located on the front of the circuit breaker
for opening and closing the breaker manually, without a need for
external control power.
10. Where indicated on the drawings as EO, each primary circuit
breaker shall be electrically operated. Energy required for closing
and opening of the circuit breaker shall be provided by charging of
springs by an electrical motor. Electrical closing/opening of the
circuit breaker shall be accomplished by energizing spring release
coil/shunt trip coil. Control voltage required for electrical
operation of the circuit breaker shall be ([derived from a control
power transformer mounted within the switchgear] [supplied by owner
from an external source] and shall be as follows:
a. ([120] [240] VAC CLOSE and AC Capacitor Trip.
-- (OR--
b. ([24] [48] [125] VDC CLOSE, and ([24] [48] [125] VDC
Trip.
11. One control circuit cutout device shall be provided and
installed in the control compartment of each primary circuit
breaker for control circuit isolation and short circuit
protection.
12. All primary EO circuit breakers shall also be supplied with
a spring charging handle located on the front of the circuit
breaker for manually charging closing springs during an emergency
or for maintenance. Manual ON and OFF push buttons shall be located
on the front of the circuit breaker for opening and closing the
circuit breaker manually.
13. (For primary MO circuit breakers, provide pad lockable
hinged plastic cover to limit access to Manual ON and OFF push
buttons.
14. (For primary EO circuit breakers, provide pad lockable
hinged plastic cover to limit access to Manual OFF pushbutton and
completely prevent access to Manual ON pushbutton.
E. Primary Trip Units
1. The switchgear manufacturer shall furnish and install, in the
metal-enclosed switchgear, the quantity and type of primary trip
units and current sensors or protection relays and current
transformers as indicated on the drawings and described hereinafter
in this specification.
2. Microprocessor Based Three-Phase & Ground Overcurrent
& Voltage Protection Circuit Breaker Relay System with metering
and on-board display capability (Eaton type Digitrip 1150V or
equivalent)
Note to Spec Writer -The Digitrip 1150V is a relay integral to
the primary circuit breaker. It can be applied with Manually
Operated (without a need for external control power) or
Electrically Operated circuit breakers. Application of this device
with MO or EO operated circuit breakers can result in cost savings
compared to EO circuit breakers with external relays.
a. The three-phase and ground overcurrent and voltage protective
relay system shall consist of Eaton Digitrip 1150V or equivalent
trip unit, Type-V or equivalent current sensors and matching rating
plug for the trip unit, and mechanical trip actuator. The trip unit
shall be UL recognized, CSA approved, and carry CE mark.
b. The mechanical trip actuator assembly and the relay shall be
installed on the circuit breaker. The relay shall be front
accessible. The current sensors shall be installed over insulated
bushings, one in each phase, in the primary circuit. The assembly
of the bushings and current sensors shall withstand rated impulse
voltage of the assembly. Each relay shall have rating plug
installed that is matched to the associated current sensor rating.
Provide an additional rating label on the back surface of the
compartment door as a reference to indicate the current sensor and
rating plug ratings used for primary circuit associated with that
compartment.
c. The current sensor rating for each circuit shall be as
indicated on the drawings or specified hereinafter in this
specification. The current sensors produce a secondary output
current proportional to the load current. The current sensors and
rating plug defines the maximum continuous current rating of the
circuit breaker (In). The overcurrent protection functions of the
relay shall be self-powered from the current flowing in the
secondary of the current sensors. The relay shall continuously
analyze the secondary current signals and, when preset current
levels and time delay settings are exceeded, send an initiating
trip signal to the trip actuator of the circuit breaker. The trip
actuator shall cause tripping of the circuit breaker by providing
the required mechanical force for the tripping. The primary circuit
breaker mechanism shall automatically reset the trip actuator each
time the circuit breaker opens.
d. The primary circuit breaker relay shall provide following
ANSI/IEEE protection functions:
1. 51/50 (time and instantaneous overcurrent) for each of the
(3) phases
2. 51/50N or 51/50G (time and instantaneous overcurrent) for
ground
3. 37 (phase loss, with adjustable time delay)
4. 46 (current unbalance, with adjustable time delay)
5. 27 (3-phase undervoltage, with adjustable time delay)
6. 59 (3-phase overvoltage, with adjustable time delay)
7. 81U (underfrequency, with adjustable time delay)
8. 81O (overfrequency, with adjustable time delay)
9. 47 (voltage unbalance, with adjustable time delay)
10. 32 (reverse power, with adjustable time delay)
e. The primary relay shall be microprocessor based that operates
from secondary output of current sensors and external voltage
transformers and provide true RMS sensing of each phase and ground,
and suitable for application to either 50 or 60 Hz systems. The
ground protection shall be capable of being utilized in residual
scheme, zero sequence scheme, or deactivated. The overcurrent
protection functions of the relay shall be self-powered from the
current flowing in the secondary of the current sensors. The
auxiliary power required for voltage and frequency related
protection and alarm functions shall be ([120 VAC] [230 VAC] [24 to
48 VDC] [125 VDC] +/- 10%, and shall be ([supplied by an owner from
a reliable external source] [derived from UPS module powered from a
CPT within the switchgear lineup].f. The phase and ground
time-overcurrent response curves shall have selectable
characteristics as follows:
1. Phase Long Delay: I2t, I4t, IEEE Moderately Inverse, Very
Inverse, or Extremely Inverse2. Phase Short Delay: FLAT or I2t3.
Phase Instantaneous: FLAT or I2t4. Ground Overcurrent: FLAT or
I2t
g. Phase Long Delay protection shall have memory feature, when
enabled, shall cause breaker to trip in progressively shorter time
if the primary circuit breaker trips and recloses on repeated
overload conditions. The memory feature shall reset when at least
10 minutes have elapsed between the overloads.
h. The relay shall have ground fault memory to protect loads in
the event of an arc-to-ground. The ground protection shall remember
the arc-to-ground event for up to ten (10) times the time setting
to allow detection of the ground fault. After the expiration of the
time, the unit shall reset automatically.
i. The sensing current for Ground protection shall be derived
from the residual connections of the phase sensors or a separate
Eaton Type-V or equivalent zero sequence sensor as indicated on the
drawings or specified herein after in this specification.
j. The primary relay shall accept secondary output of 110 or 120
VAC, derived from a set of external primary voltage transformers,
connected in two line-to-line or three line-to-ground
configurations. The primary voltage transformer ratio shall be
programmable for correct display of measured primary voltages,
power, and energy values.
k. The primary relay shall have a built-in 24-character
alpha-numeric LED display to allow programming and viewing of
settings, menus, trip and alarm logs, and real time metering data.
All settings shall be programmable through use of appropriate
buttons located on the front of the unit.
l. Primary relay shall be capable of displaying following meter
values:
1. Individual phase and ground currents in RMS amperes, real
time
2. Individual phase and ground currents in average RMS amperes
(5 minute average)3. Individual phase and ground currents, maximum
and minimum (since last reset)4. Line-to-Line Voltages V-AB, V-BC,
V-CA5. Forward/Reverse kW, kW Demand, and Max kW Demand6. KVA, kVA
Demand, and Max kVA Demand7. Watt and VA demand, maximum W and VA
demand8. Forward/Reverse kWh9. KVAh10. Total Harmonic Distortion
for each phase current11. Individual harmonic currents up through
27th harmonic for each phase12. Power factor, minimum, maximum13.
Frequency14. Circuit breaker operations count15. Metering accuracy
shall be minimum:a. +/- 1% of full-scale (In) for currents for
currents in the range of 5 to 100% of (In)b. +/- 3% of full-scale
for voltages (full-scale is equal to VT primary voltage)c. +/- 4%
of full scale for power and energy readings
16. The primary relay shall be capable of communication via
Cutler-Hammer PowerXpert system to a remote master computer via a
PowerXpert Gateway. The communication shall include display of
monitored values, trip/alarm events, remote open/close controls,
and waveform capture and display.
17. (Provide one interface module to translate C-H INCOM
protocol to MODBUS protocol for communication with remote Modbus
master.18. The primary relay shall have programmable output
contacts, designated as Relay contacts A, B, and C. The Relay
contact A can be programmed and activated for one or more trip or
alarm conditions or it can be programmed for use as a pulse
initiator for either kWh or kVAh functions to transmit kWh or kVAh
pulses to an external counter. The Relay contact B can be
programmed and activated for one or more trip conditions for use as
blocking relay to prevent closing of the circuit breaker after a
trip until the trip unit is reset. The Relay contact C can be
programmed and activated and latched for one or more trip
conditions.
m. Zone Interlocking
1. The Phase Short Delay time overcurrent and Ground time
overcurrent protection functions shall be capable of being zone
interlocked between two or more primary relays OR secondary trip
units, to provide the fastest possible tripping for faults within
the zone of protection of the primary OR secondary circuit breaker,
and yet also provide positive coordination among all primary OR
secondary circuit breakers in the system to limit power outage to
only the affected part of the system. Zone Interlocking wiring
shall be provided when indicated on the drawings or specified
herein after in this specification. When Zone Interlocking is
employed, a fault within the zone of protection in the primary OR
secondary circuit breaker shall cause the appropriate primary relay
OR secondary trip unit to simultaneously trip the affected primary
OR secondary circuit breaker immediately, and send a signal to
upstream primary relay OR secondary trip unit to restrain from
tripping immediately. The restraining signal shall cause the
upstream protective devices to follow their set coordination times,
so that the service is only minimally disrupted while the fault is
cleared in the shortest possible time.
n. The primary relay shall be provided with a green LED (for
unit status) that blinks approximately once every second to
indicate that the trip unit is energized and operating properly.
The overcurrent functions of the relay shall become self-powered
once the 3-phase load current through the circuit breaker exceeds
approximately 10-12% of the current sensor rating or 1-phase load
current exceeds approximately 30% of the current sensor rating.
o. The primary relay shall be provided with representation of
the time-current curve depicted on the faceplate of the unit that
indicates the protection functions. The relay shall have battery
backed-up LEDs strategically located in the related segment of the
time-current representation to indicate mode of trip following an
automatic trip operation. A battery test button shall be provided
to confirm battery status and to reset the LEDs. All protection
function of the unit shall be independent of the battery. The
battery shall be used to for trip indication LEDs only. The battery
shall be 3 volt, 1/3N lithium cell. It shall be front accessible
and shall not affect operation of the relay or its protection
function when installing/removing even when circuit breaker is in
service.p. The primary relay shall provide following data through
its front panel display to help plan inspection and maintenance
schedules of the circuit breaker and circuit it is protecting:1.
-Total number of instantaneous and short delay trip operations by
the circuit breaker since last reset2. -Total number of overloads
(long delay trips) and ground fault trips since last reset3. -Total
number of Close Operations by the circuit breaker since last
reset4. -The last time the circuit breaker was operated (Opened or
Closed or Tripped) with time and date5. -Maximum chip temperature
in degrees C as seen by the trip unitq. The relay shall have a test
access port, protected by removable Plexiglas cover, for interface
with a hand held tester capable of testing trip elements of the
trip unit, and mechanical trip assembly of the circuit breaker.
r. (Provide one hand held tester
s. (Provide communication cable (TripLink) to transfer settings
from one relay to another via test access ports of the trip
units.
3. When shown on the drawings or specified herein after, provide
primary circuit breakers with Overcurrent Trip Switch (OTS). The
switch shall operate when the circuit breaker has been tripped by
the action of an integral protective relay. The switch shall have
one Form-C contact wired out to terminal blocks, unless noted
otherwise on the drawings. When the switch operates, its contact
shall change state and remain in that state until the switch is
manually reset.2.03 TRANSFORMER SECTION
Products A Product Transformers
*Note to Spec. Writer: Select transformer from one of the
following:
Dry-Type Transformers
Section 16322B Part 2
RESIBLOC( Cast Resin Transformers
Section 16322C Part 2
Cast-Coil Transformers
Section 16322D Part 2
** Note that the transformer core & coils will be rotated 90
degrees to allow for a reduction in overall transformer enclosure
width. High voltage and low voltage connections will be on the same
side of the transformer, and shall be per section 1.01.C.
2.03 SECONDARY EQUIPMENT (600v CLASS)
A. Secondary Ratings
1. Secondary voltage rating shall be as indicated on the
drawings. The entire secondary section shall be suitable for 600VAC
maximum service.2. The secondary assembly shall be rated to
withstand mechanical forces exerted during short-circuit conditions
when connected directly to a power source having available fault
current [of ((42,000) (65,000) (85,000) (100,000) amperes
symmetrical at rated voltage] [as shown on the drawings].3. The
secondary bus system shall have a minimum ANSI short-circuit
withstand rating of ([100,000] [150,000] amperes symmetrical tested
in accordance with ANSI C37.20.1 and UL1558.4. All secondary
circuit breakers shall have a minimum symmetrical interrupting
capacity of ([42,000] [50,000] [65,000] [85,000] [100,000] amperes.
To ensure a fully selective system, all circuit breakers shall have
30 cycle short-time withstand ratings equal to their symmetrical
interrupting ratings through 85,000 amperes, regardless of whether
equipped with instantaneous trip protection or not.5. All secondary
ratings shall be tested to the requirements of ANSI C37.20.1,
C37.50 and C37.51 and UL witnessed and approved.
B. Secondary Construction
1. The secondary MAIN compartment shall be located above the
primary compartment as described in section 2.02.B, all in one
section. The individual primary & secondary compartments shall
have sufficient grounded steel or glass polyester barriers to
prevent access between the two compartments. Connections to both
the MV and LV terminals on the transformer shall be made from this
section, as described in section 1.01.C. Each secondary main
circuit breaker load side studs shall include the necessary
three-phase bus connections to the main vertical section bus.2. The
secondary FEEDER section(s) shall consist of the required number of
vertical sections bolted together to form a rigid assembly. The
sides shall be covered with removable bolt-on covers. All edges of
front covers or hinged front panels shall be formed. Provide
ventilators located on the top of the switchgear over the breaker
and bus compartments to ensure adequate ventilation within the
enclosure. ([The rear covers shall be fabricated in two (2) pieces
for ease of handling and shall be mounted using captive hardware]
[Hinged rear doors, complete with provisions for padlocking, shall
be provided.]3. The secondary assembly shall be provided with
adequate lifting means and shall be capable of being moved into
installation position and bolted directly to ([Contractor supplied
floor sills to be set level in concrete per manufacturers
recommendations] [the floor without the use of floor sills
providing the floor is level to 1/8 inch per 3-foot distance in any
direction]. Provisions shall be made for jacking of shipping
groups, for removal of skids or insertion of equipment rollers.
Base of assembly shall be suitable for rolling directly on pipes
without skids. The base shall be equipped with slots in the base
frame members to accommodate the use of pry bars for moving the
equipment to its final position.4. Each vertical steel unit forming
part of the switchgear line-up shall be a self-contained housing
having one or more individual breaker or instrument compartments, a
centralized bus compartment and a rear cable compartment. Each
individual primary or secondary circuit breaker compartment, or
cell, shall be segregated from adjacent compartments and sections
by means of steel barriers to the maximum extent possible. It shall
be equipped with draw-out rails and phase & control
disconnecting contacts. Removable hinge pins shall be provided on
the primary and secondary breaker compartment door hinges. Current
transformers for feeder instrumentation, where shown on the plans,
shall be located within the appropriate breaker cells and be front
accessible and removable.5. The stationary part of the phase
disconnecting devices for each power circuit breaker shall be
breaker mounted and consist of a set of contacts extending to the
rear through glass polyester insulating support barrier;
corresponding moving finger contacts, suitably spaced, shall be
furnished on the power circuit breaker studs which engage in only
the connected position. The assembly shall provide multiple
silver-to-silver full floating high pressure point contacts with
uniform pressure on each finger maintained by springs. Each feeder
circuit breaker shall include the necessary three-phase bus
connections between the section bus and the breaker line side
studs. Load studs shall be equipped with insulated copper load
extension buses terminating in solderless type terminals in the
rear cable compartment of each structure. Bus extensions shall be
([silver-plated] [tin-plated] where outgoing terminals are
attached.6. The secondary circuit breaker door design shall be such
that the following functions may be performed without the need to
open the circuit breaker door: lever circuit breaker between
positions, operate manual charging system, close and open circuit
breaker, examine and adjust trip unit, and read circuit breaker
rating nameplate.7. The control disconnecting devices shall consist
of floating terminals mounted on the stationary unit and engaging
mating contacts at the front of the breaker. The control
disconnecting devices shall be gold-plated and engagement shall be
maintained in the connected and test positions.8. The removable
secondary power circuit breaker element shall be equipped with
disconnecting contacts and interlocks for drawout application. It
shall have four positions, connected, test, disconnected and
removed. The breaker drawout element shall contain a worm gear
levering in and out mechanism with removable lever crank. Levering
shall be accomplished via the use of conventional tools. Mechanical
interlocking shall be provided so that the breaker is in the
tripped position before levering in or out of the cell.
Interlocking that trips the breaker will not be accepted. The
breaker shall include an optional provision for key locking open to
prevent manual or electric closing. Padlocking shall provide for
securing the breaker in the connected, test, or disconnected
position by preventing levering.9. An insulating flash shield shall
be mounted above each circuit breaker to prevent flashover from the
arc chutes to ground.10. The secondary switchgear shall be Eaton
Magnum DS low voltage metal-enclosed switchgear, utilizing Magnum
DS power circuit breakers as herein specified.11. (The switchgear
shall be suitable for use as service entrance equipment and be
labeled in accordance with UL requirements.12. (Provide a rear
compartment barrier between the cable compartment and the main bus
to protect against inadvertent contact with main or vertical bus
bars.13. (Provide in the cell when the circuit breaker is
withdrawn, a safety shutter which automatically covers the line and
load stabs and protects against incidental contact. 14. (Provide a
metal barrier full height and depth between adjacent vertical
structures in the cable compartment.15. (Provide a glass polyester
full height and depth barrier between adjacent vertical structures
in the bus compartment with appropriate slots for main bus. C.
Secondary Bus
1. The secondary LV bus bars shall be ([silver-plated copper]
[tin-plated copper]. Main horizontal bus bars shall be mounted with
all three phases arranged in the same vertical plane. Bus sizing
shall be based on ANSI standard temperature rise criteria of 65
degrees C over a 40 degrees C ambient (outside the enclosure).
2. Provide a full capacity neutral bus where a neutral bus is
indicated on the drawings.3. A copper ground bus shall be furnished
firmly secured to each vertical section structure and shall extend
the entire length of the switchgear. The ground bus short-time
withstand rating shall meet that of the largest circuit breaker
within the assembly.4. All hardware used on conductors shall be
high-tensile strength and zinc-plated. All bus joints shall be
provided with Belleville-type washers.
D. Wiring/Terminations
1. Small wiring, necessary fuse blocks and terminal blocks
within the switchgear shall be furnished as required. Control
components mounted within the assembly shall be suitably marked for
identification corresponding to the appropriate designations on
manufacturers wiring diagrams.2. Provide a front accessible,
isolated vertical wireway for routing of factory and field wiring.
Factory provisions shall be made for securing field wiring without
the need for adhesive wire anchors.3. Front access to all circuit
breaker secondary connection points shall be provided for ease of
troubleshooting and connection to external field connections
without the need of removing the circuit breaker for access.4. All
control wire shall be type SIS. Control wiring shall be ([16 ] [14
] gauge for control circuits and ([14 ] [12 ] gauge for current
transformer circuits. Wire bundles shall be secured with nylon ties
and anchored to the assembly with the use of pre-punched wire
lances or nylon non-adhesive anchors. All current transformer
secondary leads shall first be connected to conveniently accessible
shorting terminal blocks before connecting to any other device.
Shorting screws with provisions for storage shall be provided. All
groups of control wires leaving the switchgear shall be provided
with terminal blocks with suitable numbering strips and provisions
for #10 AWG field connections. Each control wire shall be marked to
the origin zone/wire name/destination zone over the entire length
of the wire using a cured ink process. ([Provide wire markers at
each end of all control wiring]. Plug-in terminal blocks shall be
provided for all shipping split wires. Terminal connections to
remote devices or sources shall be front accessible via doors above
each circuit breaker.5. NEMA 2-hole ([mechanical-] [crimp-] type
lugs shall be provided for all line and load terminations where
applicable, suitable for copper or aluminum cable rated for 75
degrees C of the size indicated on the drawings.
6. Lugs shall be provided in the incoming line section for
connection of the main grounding conductor. Additional lugs for
connection of other grounding conductors shall be provided as
indicated on the drawings.7. (Reusable insulating boots shall be
provided to cover all power cable terminations.
E. Secondary circuit breakers
1. All protective secondary devices shall be low voltage power
circuit breakers, Eaton type Magnum DS or approved equal. All
breakers shall be UL listed for application in their intended
enclosures for 100% of their continuous ampere rating.2. All
secondary power circuit breakers shall be constructed and tested in
accordance with ANSI C37.13, C37.16, C37.17, C37.50, UL 1066 and
NEMA SG-3 standard. The breaker shall carry a UL label.3. Secondary
breakers shall be provided in drawout configuration. The 800, 1600,
2000 and 3200 ampere frame power circuit breakers shall be provided
in the same physical frame size, while 4000, 5000 and 6000 ampere
frame power circuit breakers shall be provided in a second physical
frame size. Both physical frame sizes shall have a common height
and depth.4. Secondary power circuit breakers shall utilize a
two-step stored-energy mechanism to charge the closing springs. The
closing of the breaker contacts shall automatically charge the
opening springs to ensure quick-break operation.
5. Secondary breakers shall be manually operated (MO) unless
electrically operated (EO) is indicated on the drawings.6.
Electrically operated secondary breakers shall be complete with
([120 VAC] [240 VAC] [24 VDC] [48 VDC] [125 VDC] motor operators.
The charging time of the motor shall not exceed 6 seconds.7. To
facilitate lifting, the secondary power circuit breaker shall have
integral handles on the side of the breaker.8. The secondary power
circuit breaker shall have a closing time of not more than 3
cycles.9. The secondary breaker phase contacts shall have an easily
accessible wear indicator to indicate contact erosion.10. The
secondary power circuit breaker shall have three windows in the
front cover to clearly indicate any electrical accessories that are
mounted in the breaker. The accessory shall have a label that will
indicate its function and voltage. The accessories shall be plug
and lock type and UL listed for easy field installation. They shall
be modular in design and shall be common to all frame sizes and
ratings.11. The secondary breaker control interface shall have
color-coded visual indicators to indicate contact open or closed
positions, as well as mechanism charged and discharged positions.
Manual control pushbuttons on the breaker face shall be provided
for opening and closing the breaker. The power circuit breaker
shall have a Positive On feature. The breaker flag will read Closed
if the contacts are welded and the breaker is tripped or opened.12.
The current sensors shall have a back cover window that will permit
viewing the sensor rating on the back of the secondary breaker. A
rating plug will offer indication of the rating on the front of the
trip unit.13. A position indicator shall be located on the
faceplate of the secondary breaker. This indicator shall provide
color indication of the breaker position in the cell. These
positions shall be Connect (Red), Test (Yellow), and Disconnect
(Green). The levering door shall be interlocked so that when the
breaker is in the closed position, the breaker levering-in door
shall not open.14. Each secondary power circuit breaker shall offer
a minimum of sixty (60) front-mounted dedicated control wiring
points. Each wiring point shall have finger safe contacts, which
will accommodate #10 AWG maximum field connections with ring tongue
or spade terminals or bare wire.
*Note to Spec. Writer:
Digitrip RMS trip units are available in four (4) models:
Digitrip RMS 520 Basic protection select Paragraph 2.07 A
through I.
Digitrip RMS 520M Basic protection with local current metering,
select Paragraph 2.07 A through K.
Digitrip RMS 520MC Basic protection with local current metering
and remote communications, select Paragraph 2.07 A through L, and
X.
Digitrip RMS 1150+ Advanced protection, metering, LED display
and remote communications, select Paragraph 2.07 A through E, H
through J, and L through X.
F. SECONDARY TRIP UNITS1. Each secondary low voltage power
circuit breaker shall be equipped with a solid-state tripping
system consisting of three current sensors, microprocessor-based
trip device and flux-transfer shunt trip. Current sensors shall
provide operation and signal function. The trip unit shall use
microprocessor-based technology to provide the basic adjustable
time-current protection functions. True RMS sensing circuit
protection shall be achieved by analyzing the secondary current
signals received from the circuit breaker current sensors and
initiating trip signals to the circuit breaker trip actuators when
predetermined trip levels and time delay settings are reached.
Interchangeable current sensors with their associated rating plug
shall establish the continuous trip rating of each circuit breaker.
The trip unit shall be Eaton type Digitrip RMS ([520] [520M]
[520MC] [1150+].2. The secondary trip unit shall have an
information system that utilizes battery backup LEDs to indicate
mode of trip following an automatic trip operation. The indication
of the mode of trip shall be retained after an automatic trip. A
reset button shall be provided to turn off the LED indication after
an automatic trip. A test pushbutton shall energize a LED to
indicate the battery status.3. The secondary trip unit shall be
provided with a display panel, including a representation of the
time/current curve that will indicate the protection functions. The
unit shall be continuously self-checking and provide a visual
indication that the internal circuitry is being monitored and is
fully operational.4. The secondary trip unit shall be provided with
a making-current release circuit. The circuit shall be armed for
approximately two cycles after breaker closing and shall operate
for all peak fault levels above 25 times the ampere value of the
rating plug.5. Secondary trip unit shall have selectable powered
and unpowered thermal memory for enhanced circuit protection.6.
Complete system selective coordination shall be provided by the
addition of the following individually adjustable time/current
curve shaping solid-state elements:a. All circuit breakers shall
have adjustments for long delay pickup and timeb. ([Main] [Tie]
[Feeders] [All circuit breakers] shall have individual adjustments
for short delay pickup and time, and include I2t settingsc. ([Main]
[Tie] [Feeders] [All circuit breakers] shall have an adjustable
instantaneous pickupd. ([Main] [Tie] [Feeders] [All circuit
breakers] [Circuit breakers, where indicated on the drawings,]
shall have individually adjustable ground fault current pickup and
time, and include I2t settings or ground alarm only
7. The secondary trip unit shall have provisions for a single
test kit to test each of the trip functions.8. The Phase Short
Delay time overcurrent and Ground time overcurrent protection
functions shall be capable of being zone interlocked between two or
more primary OR secondary trip units, to provide the fastest
possible tripping for faults within the zone of protection of the
primary OR secondary circuit breaker, and yet also provide positive
coordination among all primary OR secondary circuit breakers in the
system to limit power outage to only the affected part of the
system. Zone Interlocking wiring shall be provided when indicated
on the drawings or specified herein after in this specification.
When Zone Interlocking is employed, a fault within the zone of
protection in the primary OR secondary circuit breaker shall cause
the appropriate primary OR secondary trip unit to simultaneously
trip the affected primary OR secondary circuit breaker immediately,
and send a signal to upstream primary OR secondary trip unit to
restrain from tripping immediately. The restraining signal shall
cause the upstream trip units to follow their set coordination
times, so that the service is only minimally disrupted while the
fault is cleared in the shortest possible time. (Factory shall wire
for zone interlocking for the power circuit breakers within the
switchgear.9. (([Main] [Tie] [Feeders] [All secondary circuit
breakers] [Secondary circuit breakers, where indicated on the
drawings,] shall have individually adjustable ground fault alarm
only.10. ([Except 520] The secondary trip unit shall have a
4-character LCD display showing phase, neutral, and ground current.
The accuracy of these readings shall be +/- 2% of full scale.11.
([Only 520MC & 1150+] The secondary trip unit shall be equipped
to permit communication via a network twisted pair for remote
monitoring and control.12. The secondary trip unit shall include a
power/relay module which shall supply control to the readout
display. Following an automatic trip operation of the circuit
breaker, the trip unit shall maintain the cause of trip history and
the mode of trip LED indication as long as its internal power
supply is available. ([except 520] An internal relay shall be
programmable to provide contacts for remote ground alarm
indication.13. The secondary trip unit shall include a voltage
transformer module, suitable for operation up to 600V, 50/60 Hz.
The primary of the voltage transformer module shall be connected
internally to the line side of the circuit breaker through a
dielectric test disconnect plug.14. ([1150+ only] The display for
the secondary trip units shall be a 24-character LED display.15.
([1150+ only] Metering display accuracy of the complete system,
including current sensors, auxiliary CTs, and the secondary trip
unit, shall be +/- 1% of full scale for current values. Metering
display accuracy of the complete system shall be +/- 2% of full
scale for power and energy values.16. ([1150+ only] The secondary
unit shall be capable of monitoring the following data:a.
Instantaneous value of phase, neutral and ground currentb.
Instantaneous value of line-to-line voltagec. Minimum and maximum
current valuesd. Watts, Vars, VA, Watt hours, Var hours and VA
hours
17. ([1150+ only] The energy-monitoring parameter values (peak
demand, present demand, and energy consumption) shall be indicated
in the secondary trip units alphanumeric display panel.18. ([1150+
only] The secondary trip unit shall display the following power
quality values: crest factor, power factor, percent total harmonic
distortion, and harmonic values of all phases through the 31st
harmonic.19. ([1150+ only] An adjustable high load alarm shall be
provided, adjustable from 50 to 100% of the long delay pickup
setting.20. ([1150+ only] The secondary trip unit shall contain an
integral test pushbutton. A keypad shall be provided to enable the
user to select the values of test currents within a range of
available settings. The protection functions shall not be affected
during test operations. The breaker may be tested in the TRIP or NO
TRIP test mode.21. ([1150+ only] Programming may be done via a
keypad at the faceplate of the unit or via the communication
network.22. System coordination shall be provided by the following
microprocessor-based programmable time-current curve shaping
adjustments. The short-time pickup adjustment shall be dependant on
the long delay setting.a. Programmable long-time settingb.
Programmable long-time delay with selectable I2t or I4t curve
shapingc. Programmable short-time settingd. Programmable short-time
delay with selectable flat or I2t curve shaping, and zone selective
interlockinge. Programmable instantaneous settingf. Programmable
ground fault setting trip or ground fault setting alarmg.
Programmable ground fault delay with selectable flat or I2t curve
shaping and zone selective interlocking
23. ([1150+ only] The secondary trip unit shall offer a
three-event trip log that will store the trip data, and shall time
and date stamp the event.24. ([1150+ only] The secondary trip unit
shall have the following advanced features integral to the trip
unit:
a. Adjustable undervoltage releaseb. Adjustable overvoltage
releasec. Reverse load and fault currentd. Reverse sequence voltage
alarme. Underfrequencyf. Overfrequencyg. Voltage phase unbalance
and phase loss during current detection
25. ([1150+ only] The secondary trip unit shall offer
information on the circuit breakers health. The data available
shall include total number of all Instantaneous and Short Delay
trips seen by the circuit breaker, an additional count of all the
overloads and ground fault trips seen by the circuit breaker, an
operation counter, a time stamp of the last breaker operation, and
the maximum temperature seen by the trip unit. All these data
points will be stored in non volatile memory and available for
remote communications.26. ([520MC, 1150+] The secondary trip unit
shall utilize ARMS Technology (Arc Flash Reduction Maintenance
System). The ARMS Technology shall be provided in a system that
shall reduce the trip unit Instantaneous pickup value when
activated. The ARMS device shall not compromise breaker phase
protection even when enabled. Once the ARMS unit is disabled, the
recalibration of trip unit phase protection shall not be required.
Activation and deactivation of the ARMS Technology trip setting
shall be accomplished without opening the circuit breaker door and
exposing operators to energized parts. The ARMS Technology shall
provide a clearing time of 0.04 seconds, adjustable with a minimum
of five settings ranging from 2.5X to 10X of the sensor value.27.
[520MC ARMS Technology shall be enabled via a switch on the trip
unit and operation is indicated via a blue LED on the trip unit.]
[1150+ ARMS Technology shall be enabled via programmable keypad on
trip unit and operation is indicated via a flashing ARMS message on
the display.] 28. (The ARMS Technology shall be provided with
remote enable/disable control..29. (The ARMS Technology shall be
provided with a switchgear panel mounted enable padlockable
selector switch and indication via Blue LED pilot light.30. (The
ARMS Technology shall be wired locally with interposing relays and
wired to terminal blocks to enable a remote selector switch and
confirmation light to be mounted a the downstream protected
distribution equipment.
31. *Note to Spec. Writer: For remote enable/indication add in
the downstream distribution equipment specification a requirement
for a padlockable selector switch and Blue LED confirmation
light.
2.04 CENTRAL DISPLAY UNIT
A. Where indicated on the drawings, provide a central display
unit capable of displaying information and data from trip units
specified above.
*Note to Spec. Writer: For centralized local monitoring of the
Digitrip 520MC, Digitrip 1150+ and 1150(V) units, select BIM II
from Section 16901, Paragraph 2.03 A2.05 MISCELLANEOUS DEVICES
A. Key interlocks shall be provided as indicated on the
drawings. These interlocks shall keep the circuit breakers
trip-free when actuated.B. (Each section of the switchgear shall be
provided with a space heater ([thermostatically controlled]. Power
for the space heaters shall be obtained ([from a control power
transformer within the switchgear] [from a source as indicated on
the drawings]. Supply voltage shall be 120VAC.C. Fused control
power transformers shall be provided as indicated on the drawings
or as required for proper operation of the equipment. A manual
disconnect shall be provided ahead of the primary fuses. ([Control
power transformers shall have adequate capacity to supply power to
the transformer cooling fans.]
2.06 OWNER METERING
A. Where indicated on the drawings, provide a separate
compartment for owner metering with front hinged door.B. Provide
current transformers for each meter. Current transformers shall be
wired to shorting-type terminal blocks.C. Provide ([potential
transformers including primary and secondary fuses with
disconnecting means] [fused potential taps as the potential source]
for metering as shown on the drawings.
*Note to Spec. Writer: Select Devices as required for Paragraph
2.11.C.1Refer to Section 16901 for detailed specification for
metering.
1. Microprocessor-Based Metering System.
2.07 Enclosures
A. NEMA 1 Enclosure
1. A portable overhead circuit breaker lifter shall be provided
to assist in removal of the circuit breakers from the enclosure2.
Each shipping section shall be shipped completely assembled
2.08 Nameplates
A. Engraved nameplates, mounted on the face of the assembly,
shall be furnished for all main and feeder circuits as indicated on
the drawings. Nameplates shall be laminated plastic, black
characters on white background, and secured with screws. Characters
shall be 3/16-inch high, minimum. B. Furnish master nameplate
giving switchgear designation, voltage ampere rating, short-circuit
rating, and manufacturers name. C. Control components mounted
within the assembly, such as fuse blocks, relays, pushbuttons,
switches, etc., shall be suitably marked for identification
corresponding to appropriate designations on manufacturers
drawings.
2.09 Finish
A. All exterior and interior steel surfaces of the switchgear
shall be properly cleaned and provided with a rust-inhibiting
phosphatized coating. Color and finish of the switchgear shall be
ANSI 61.
2.010 Accessories
A. Provide a ([traveling type circuit breaker lifter,
rail-mounted on top of switchgear] [floor running portable circuit
breaker transfer truck with manual lifting mechanism].
2.011 (Surge Protection DeviceA. Provide transient voltage surge
suppression as specified in Section 16671A.
PART 3execution
3.01factory testing
A. Standard factory tests shall be performed on the primary
equipment provided under this section. All tests shall be in
accordance with the latest version of ANSI and NEMA standards.B.
The following factory tests shall be made on all transformers. All
tests shall be in accordance with the latest revision of ANSI and
NEMA standards.
1. Resistance measurements of all windings on the rated voltage
connection of each unit and at the tap extremes of one unit only of
a given rating on this project2. Ratio tests on the rated voltage
connection and on all tap connections3. Polarity and phase-relation
tests on the rated voltage connections4. No-load loss at rated
voltage on the rated voltage connection5. Exciting current at rated
voltage on the rated voltage connection6. Impedance and load loss
at rated current on the rated voltage connection of each unit and
on the tap extremes of one unit only of a given rating on this
project7. Applied potential test8. Induced potential tests9.
Temperature test(s) shall be made on ([all units] [one unit] only
of a project covering one or more units of a given kVA rating].
Tests shall not be required when there is available a record of a
temperature test on an essentially duplicate unit. When a
transformer is supplied with auxiliary cooling equipment to provide
more than one kVA rating, temperature tests as listed above shall
be made on the lowest kVA ONAN or AA rating and the highest kVA
ONAF rating10. ANSI impulse test on all primary windings
C. The following standard factory tests shall be performed on
the secondary equipment provided under this section. All tests
shall be in accordance with the latest version of ANSI and NEMA
standards.
11. The switchgear shall be completely assembled, wired,
adjusted and tested at the factory. After assembly, the complete
switchgear shall be tested to ensure the accuracy of the wiring and
the functioning of all equipment. The main bus system shall be
given a dielectric test of 2200 volts for one minute between live
parts and ground and between opposite polarities12. The wiring and
control circuits shall be given a dielectric test of 1500 volts for
one minute or 1800 volts for one second between live parts and
ground, in accordance with ANSI C37.20.1
D. The manufacturer shall provide three (3) certified copies of
factory test reports.E. The owners representative shall witness the
factory tests as outlined above.
13. The manufacturer shall notify the owner two (2) weeks prior
to the date the tests are to be performed14. The manufacturer shall
include the cost of transportation and lodging for up to three (3)
owner's representatives. The cost of meals and incidental expenses
shall be the owner's responsibility
3.02field quality control
B. Provide the services of a qualified factory-trained
manufacturer's representative to assist the Contractor in
installation and startup of the equipment specified under this
section for a period of (________ working days. The manufacturer's
representative shall provide technical direction and assistance to
the contractor in general assembly of the equipment, connections
and adjustments, and testing of the assembly and components
contained herein.C. The Contractor shall provide three (3) copies
of the manufacturer's field startup report.
3.03manufacturer's certification
D. A qualified factory-trained manufacturer's representative
shall certify in writing that the equipment has been installed,
adjusted and tested in accordance with the manufacturer's
recommendations.E. The Contractor shall provide three (3) copies of
the manufacturer's representative's certification.
3.04training
F. The Contractor shall provide a training session for up to
five (5) owner's representatives for (______ normal workdays at a
job site location determined by the owner.G. A manufacturers
qualified representative shall conduct the training session. The
training program shall include instructions on the assembly
including primary equipment, transformer, and secondary equipment.
All circuit breakers, protective devices and other major components
shall be included.
3.05installation
H. The contractor shall install all equipment per the
manufacturers recommendation and the contract drawings.I. All
necessary hardware to secure the assembly in place shall be
provided by the contractor.( Note to Spec. Writer Select one
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16311A-
02/20/13