-
2350 NE Hopkins Court
Pullman, WA
99163-5603
USA
Phone: (509) 332-1890
Fax: (509) 332-7990
E-mail: [email protected]
Internet: www.selinc.com
SEL-351R Recloser Control
Data SheetData Sheet
DWG. FRONT
(press for 3 sec)LOCK
1
HOT LINE
RPULLMAN WASHINGTON USASCHWEITZER ENGINEERING LABORATORIES
145 23
SEL-351R RECLOSER CONTROL
GROUPC N T R LSET
EXIT
81C U R R E N THIGH
PORT FSERIAL
9
O T H E REVENTS STATUS
TRIPFAST
SELECT
PROBLEMBAT T ERY
TAG
METERRESET
CANCELT E S T
SUPPLYAC
ENABLEDC O N T R O L
LAMP
T A R G E T
CURVE
9 8 7 6
SEFGC
AUX 1
AUX 2
BL O C K O U T ACYCLERESET
CONTROL STATE
GROUND
RECLOSE
ENABLED
FAULT TYPE
WAKE UP
RECLOSERCLOSED
ENABLED
ENABLEDR E M O T E
C L O S ESETTINGSALTERNATE
OPEN
196-0325
TRIP
U.S. Patents 5,041,737 5,208,545 5,317,472 5,349,490 5,365,396,
5,479,315 5,515,227 5,602,707 5,694,281Foreign Patents issued and
other U.S. and Foreign Patents Pending
RECLOSER
KEY FEATURES Compatible with Standard Control
Cable and Mounting Dimensions forEase of Retrofit
Tested to ANSI/IEEE C37.60
Easy Settings
Up to Four Reclosures and SequenceCoordination
Fast and Delay Curves for Phase andGround Overcurrent
Protection
US, IEC, Programmable, and AllTraditional Recloser Curves
Underfrequency Load Shedding
Recloser Wear Monitor, Load Profiling,Sequential Events Recorder
(SER), andEvent Reports
Enhanced SELOGIC Control Equationsand Six Setting Groups for
DesigningCustom Schemes
Mirrored Bits Technology for Relay-to-Relay Digital Logic
Communications
Optional DNP Version 3.00 Level 2 Protocol with Point
Mapping
Connect True Three-Phase Voltage for:
complete metering, including MWh and MVARh load encroachment
logic to prevent tripping on load fault location and directional
overcurrent elements high-side blown fuse detection
Connect Extra Voltage Channel for Synchronism-Check and Line
Voltage Check
Control and Low VoltageClose Cables Available
from SEL.
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2INSTALLATION OVERVIEW AND EXAMPLE APPLICATIONS
NEW CAPABILITIES AVAILABLE WHEN TRADITIONAL INSTALLATIONS
ARERETROFITTED
Figure 1 shows an SEL-351R retrofitted into a traditional
installation, where single-phase 120Vac power is the only voltage
brought to the control. Even this installation has the first
elevenbulleted key features listed on the front cover. One of these
key features, underfrequency loadshedding, is illustrated in Figure
2.
(a lso connectedto voltage VAfor f requency
moni tor ing- see Figure 7) Dwg. l inedia1
120 VacPower
120 Vac Close Power(i f recloser is equipped)
Tr ip and CloseRecloser StatusIA , IB , I C , IN
Contro l Cable
LoadSource
C
B
A
RECLOSER
SEL-351R
24 Vdc
Figure 1: Retrofit Traditional Installation With SEL-351R
Recloser Control
The feeder in Figure 2 would traditionally be the last to trip
for underfrequency load sheddingbecause it serves critical fire
department and hospital loads. By retrofitting recloser
controlinstallations on various taps with SEL-351Rs, the feeder can
now contribute first tounderfrequency load shedding at the tap
level. The SEL-351Rs on the residential load taps areset to trip
first for underfrequency load shedding, without interrupting
service to the critical firedepartment and hospital loads.
Resident ia l
Resident ia l
Substat ion
SEL-351R
Fire Depar tmentand Hospi ta l
1
SEL-351R
1
SEL-351R
1
Figure 2: Implement Underfrequency Load Shedding at the Tap
Level with SEL-351RRecloser Controls
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3FULL CAPABILITIES AVAILABLE WHEN ALL VOLTAGES ARE CONNECTEDWhen
true three-phase voltage and synchronism-check voltage are
connected to the SEL-351R asshown in Figure 3, the additional key
features listed at the bottom of the front cover are gained.This
allows for more sophisticated control schemes as illustrated in
Figure 4.
120 VacPower
120 Vac Close Power(i f recloser is equipped)
Tr ip and CloseRecloser StatusIA, IB , IC , IN
Control Cable
SEL-351R
Connect to extra vol tagechannel VS for synchronism-check and l
ine vol tagecheck (channel VSconnected to phase A in th
isexample)
Dwg. lnd iag24 Vdc3-Phase Vol tage(connect to vol tage
channels VA, VB, and VC)
LoadSource
C
B
A
RECLOSER
Figure 3: Connect True Three-Phase and Synchronism-Check
Voltages to SEL-351RRecloser Control
The load in Figure 4 can be served from either recloser 1 or
recloser 2. The respectiveSEL-351R knows the state of source- and
load-side voltages. The controls communicate viafiber-optic cable
to determine whether the load should be quickly transferred to the
other sourcein the event of an outage. This communication is
reliably and economically accomplished withMirrored Bits technology
and SEL-2815 Fiber-Optic Transceivers. If the power system
islooped, the SEL-351Rs also have directional overcurrent elements
for reliable, secure tripping.
TXRX
SEL-2815
SEL-351R
DWG: DS351R04Load
2
31
Fiber-Opt ic Cable
3 1
SEL-351R
SEL-2815
Source Source
TXRX
1
Figure 4: Improve Service Reliability for Load With Two SEL-351R
Recloser ControlsCommunicating Over Fiber-Optic Cable
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4HARDWARE OVERVIEW
Contro l CableReceptac le 7/8" and 1-3/8"
Knockouts
TerminalB lock
Bat tery Fence
Batter ies
NEMA Type 3R(IP32) Enclosure
Relay Module
120 Vac (GFCI)Convenience Out le t
D W G : M 3 5 1 R 0 3 8
SidePanel
Figure 5: SEL-351R Recloser Control Enclosure With Swing Panel
Open
Figure 6: SEL-351R Recloser Control Relay Module Side Panel
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5INSIDE THE ENCLOSURE
B
Radio
SEL-351R Recloser Contro l(not including front panel)
7 OutputContacts /1 A L A R M
EIA-485EIA-232EIA-232
VV A
V C
V S
IA, IB, IC, IN
Recloser StatusTr ip and Close
S C A D Aor
OtherControl
ControlCable
+
EIA-232(Wake Up)
120 VacPower
24 VdcLead-Acid
Battery
6 Opto isolatedInputs
dwg: insidej
(synch-check)
(a lso moni tors
to Radio
Power In
BatteryMonitor/Charger
TerminalBlock
12 Vdc Out
f requency)OrderingOption
OrderingOption
ClosePower(if recloser
is equipped)PowerSupply
24 Vdc
PowerSupply
Control
PowerSupply
12 Vdc
(if installed)
ToConvenience
Outlet
24 Vdc Out
Figure 7: Connections Inside the SEL-351R Recloser Control
Enclosure
Comments on the connections in Figure 7:
The control cable from the recloser attaches at the bottom of
the SEL-351R enclosure to astandard receptacle. The wiring from
this receptacle continues into the control itself, withthe currents
landing on the terminal block to connect channel IN residually with
phase currentchannels IA, IB, and IC.
The 120 Vac power is paralleled to voltage channel VA, as
discussed in the retrofit of atraditional installation in Figure 1.
If the SEL-351R is ordered with additional voltagechannels VB, VC,
and VS, then true three-phase voltage and synchronism check voltage
canbe connected, as discussed in Figure 3. The terminal block is
used to make these voltageconnections.
Battery charging/discharging is made through the internal
battery monitor/charger. Thisallows the control to keep track of
battery capacity. Knowing battery capacity, the controlcan put
itself to sleep if capacity reaches a user-set threshold after an
extended outage.
The figure proposes the idea of connecting a radio to
communicate with the SEL-351R. TheEIA-232 wake-up ports only
function is to receive a specific message to wake up the controlif
it has been put to sleep to conserve battery energy during an
extended outage (and 120 Vacpower has not yet been restored).
Communication takes place with the other paralleled EIA-232 port
after the unit wakes up.
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6FRONT-PANEL INTERFACE
DWG. FRNTCALL-1
(press for 3 sec)LOCK
1
HOT LINE
RPULLMAN WASHINGTON USASCHWEITZER ENGINEERING LABORATORIES
145 23
SEL-351R RECLOSER CONTROL
GROUPCNTRLSET
EXIT
81CURRENTHIGH
PORT FSERIAL
9
OTHEREVENTS STATUS
TRIPFAST
SELECT
PROBLEMBATTERY
TAG
METERRESET
CANCELTEST
SUPPLYAC
ENABLEDCONTROL
LAMP
TARGET
CURVE
9 8 7 6
SEFGC
AUX 1
AUX 2
BLOCKOUT ACYCLERESET
CONTROL STATE
GROUND
RECLOSE
ENABLED
FAULT TYPE
WAKE UP
RECLOSERCLOSED
ENABLED
ENABLEDREMOTE
CLOSESETTINGSALTERNATE
OPEN
1 9 6 - 0 3 2 5
TRIP
U.S. Patents 5,041,737 5,208,545 5,317,472 5,349,490 5,365,396,
5,479,315 5,515,227 5,602,707 5,694,281Foreign Patents issued and
other U.S. and Foreign Patents Pending
RECLOSER
Status and TripTarget LEDs
Pushbut tons
Operator Controls
Ample spacing al lowsfor protective glove
operation of al l basicrecloser control
function (note thecorresponding status
LED just to the right ofeach operator control,
except WAKE UP).
Display2 x 16 l iquid
crystal display (LCD)
1
2
3
See noted safety features forCLOSE and TRIP operatorcontrols in
Table 1.
Figure 8: SEL-351 Recloser Control Front-Panel Interface
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7Table 1: Front-Panel Interface Definitions (see Figure 8)
The pushbuttons (except TARGET RESET/LAMP TEST) have dual
functions (primary/secondary).After a primary function is selected
(i.e., METER pushbutton), the pushbuttons then revert tooperating
on their secondary functions (CANCEL, SELECT, left/right arrows,
up/down arrows,EXIT) so the user can scroll through information,
activate settings/control, etc. on the LCD.
CONTROL ENABLED* SEL-351R Recloser Control is enabled.AC SUPPLY
120 Vac power is present.BATTERY PROBLEM Indicates any of the
following battery problems:
- discharge test failure- disconnected- cannot be charged-
monitor/charger failure
HOT LINE TAG No closing or auto-reclosing can take place via the
control.TRIP Indication that a trip occurred by an overcurrent
element,
underfrequency element, or otherwise.FAST CURVE Fast curve
overcurrent element trip.HIGH CURRENT High-set overcurrent element
trip.81 Underfrequency trip.RESET The control is in the Reset
State, ready for a reclose cycle.CYCLE The control is actively in
the trip/reclose cycle mode.LOCKOUT All reclose attempts were
unsuccessful, so the control goes to the
lockout state.A, B, C* Phases A, B, or C involved in fault.G
Ground involved in fault.SEF Sensitive earth fault overcurrent
element trip.
GROUND ENABLED Enables/Disables ground overcurrent
elements.RECLOSE ENABLED Enables/Disables auto-reclosing.REMOTE
ENABLED Enables/Disables remote control.ALTERNATESETTINGS
Switches active setting group between main and alternate
settinggroups.
LOCK(press for 3 sec)
Blocks the function of other operator controls (except WAKE
UPand TRIP). 3 second delay to engage/disengage.
AUX 1 User programmable; e.g., program to Trip Test - to test
auto-recloselogic without applying current.
AUX 2 User programmable; e.g., program to Enable/Disable fast
curvetripping.
WAKE UP* Wakes up the control after it has been put to
sleep.CLOSE/RECLOSER CLOSED
Close recloser/recloser closed status.Note: The CLOSE operator
control can be set with a delay, allowingthe operator to press
CLOSE and then move away a safe distancefrom the recloser before
closing proceeds.
TRIP/RECLOSER OPEN
Trip recloser (go to lockout)/recloser open status.Note: The
TRIP operator control can be set with a delay, allowingthe operator
to press TRIP and then move a safe distance from therecloser before
tripping proceeds.
* These indicated LEDs and operator control have fixed
functions. All the other LEDs and operatorcontrols (with
corresponding status LEDs) can change function by programming at a
higher logic level.
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8COMMUNICATIONS
Front Panel
SEL-2020
SEL-351R (#2)SEL-351R (#1)
SEL-351R (#1)
Computer
PORT 2
(METALLIC)Cable #C273A
SEL-351R
SEL-351R SEL-351R
SEL-2020Communicat ions
Processor
SEL-351R (#2) SEL-351R (#32)
DATA AND T IME-SYNCHRONIZATION* CONNECTIONS
SEL-2020Communicat ions
Processor
PORT 2
Fiber-Optic Cable#C273AFZ
or #C273AF0 SEL-2810
Optical Cable ConnectionMetal l ic Cable Connection
EIA-485 CONNECTIONS ( i f ordered wi th EIA-485 por t )
PORT 1 PORT 1 PORT 1
LOCAL CONNECTIONSC O N N E C T T O THE SEL-2020O N C E A N D
COMMUNICATE W I T HANY C O N N E C T E D SEL RELAY O RR ECLOSER
CONT ROL
PORT 2 Side Panel
PORT F Front Panel
O R . . .C O N N E C T T O THE SEL-351RR ECLOSER CONT
ROLINDIVIDUALLY VIA THE FR O N T-P ANEL SERIAL PO R T
DWG: M351R050
* Demodulated IRIG-B t ime code can be input into the connector
for ei ther ser ial port 1 orserial port 2, but not both at the
same t ime.
PORT 2 Side Panel
PORT F Front Panel
Cable#C234A
Figure 9: SEL-351R Recloser Control Communications Connections
Examples
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9Operator Controls and Serial Communications
The SEL-351R is equipped with three EIA-232 serial ports (one on
the front panel and two onthe side panel) and as an option one
isolated EIA-485 serial port (on the side panel). Each serialport
operates independently of the other serial ports. The serial ports
provide full access to eventhistory, recloser control status, and
meter information. Multi-level password access providessecurity for
control and setting operations. Several communication methods are
supported:
Simple ASCII - Plain-language commands for human and
simplemachine communications.
- Use for metering, setting, self-test status, eventreporting,
and other functions.
Compressed ASCII - Comma-delimited ASCII data reports. Allows
anexternal device to obtain control data in a formatwhich directly
imports into a spreadsheet ordatabase program. Data are checksum
protected.
Extended Fast Meter - Binary protocol for
machine-to-machinecommunications. Quickly updates the SEL-2020,RTU,
and other substation devices with meteringinformation, relay
element, input and outputstatus, time-tags, open and close
commands, andsummary event reports. Data are checksumprotected.
- Binary and ASCII protocol operatesimultaneously over the same
communicationslines such that control operator meteringinformation
is not lost while a technician istransferring an event report.
Distributed Port SwitchProtocol (LMD)
- Enables multiple SEL devices to share a commoncommunications
network using a two-characteraddress from 01 to 99. LMD is
appropriate forlow-cost, low-speed port-switching applicationswhere
updating a real-time database is not arequirement.
DNP V3.0 Level 2 - Distributed Network Protocol Version
3.00Level 2 slave implementation is available. TheSEL-351R provides
point mapping to allowcustom DNP mapping for the application.
The SEL-351R does not require special communications software.
Dumb terminals, printingterminals, or a computer supplied with
terminal emulation and a serial communications port is allthat is
required.
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10
FEATURES AND BENEFITS
SEL-351R RECLOSER CONTROL DERIVED FROM THE SEL-351 RELAYThe
SEL-351R Recloser Control is derived from SELs premiere
distribution relay: the SEL-351Relay. The primary differences
between the SEL-351R and the SEL-351 Relay are:
The three single-phase time-overcurrent elements of the SEL-351
Relay (51AT, 51BT,51CT) are converted to extra phase, neutral
ground, and residual ground time-overcurrent elements (51P2T,
51N2T, and 51G2T, respectively) in the SEL-351R.These extra
time-overcurrent elements provide fast and delay curve tripping for
phaseand ground overcurrent protection.
The SEL-351R has front-panel operator controls (see bottom of
Figure 8 and Table 1).These operator controls and corresponding
status LEDs eliminate separate panel controlswitches and
lights.
EASY TO SET THE SEL-351R RECLOSER CONTROLThe SEL-351R is easy to
set - only settings such as minimum trip pickup, curve type, and
recloseinterval have to be made. These settings are made at an EZ
(easy) access level. The SELOGICControl Equations cannot be changed
at this access level.
The control logic is preconfigured at the factory. If the user
wants to customize the logic, theSELOGIC Control Equations can be
reprogrammed at a higher logic level.
TRADITIONAL RECLOSER CONTROL FEATURES AVAILABLE IN THE
SEL-351RRECLOSER CONTROL
Reclosing
The SEL-351R can reclose up to four (4) times. This allows for
up to five operations of anycombination of fast and delay curve
overcurrent elements. Each reclose interval can be set up to999,999
cycles (over 4.5 hours) if desired.After a reclose interval has
timed out, the control waits for a user-set time (close power
waittime) for the 120 Vac power to come hot before proceeding with
the auto-reclose. The recloserneeds either primary or secondary
(120 Vac) voltage to provide the closing power, depending onhow the
recloser is equipped. The 120 Vac power into the SEL-351R is an
indication of thepresence of this primary or secondary voltage. The
close power wait time has the same 999,999cycle setting range.
The reset times are separately set for reset timing for an
auto-reclose and reset timing for amanual/remote close from
lockout. Traditionally, the reset time for a manual/remote close
fromlockout is set less than the reset time for an auto-reclose.
The reset times have the same 999,999cycle setting range.
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11
Front-panel LEDs track the control state for auto-reclosing:
RESET, CYCLE, or LOCKOUT(see Figure 8 and Table 1).Sequence
coordination logic is enabled to prevent the SEL-351R from tripping
on its fast curvesfor faults beyond a downstream recloser.
If the user wants to customize the reclosing logic, the
corresponding SELOGIC Control Equationscan be reprogrammed at a
higher logic level.
Overcurrent Protection
Fast and Delay Curves
Fast and delay curves are available for phase and ground
overcurrent protection. For a nominalrecloser ct ratio of 1000:1,
these curves can be set as sensitive as 100 A and 5 A primary
forphase and ground overcurrent protection, respectively. These
fast and delay curves can be set forany combination of operations,
up to five as described in the preceding reclosing subsection
(e.g.,two fast curve operations, followed by two delay curve
operations).These curves can be set with numerous curve choices,
including user-designed curves. Thechoices resident in the SEL-351R
are listed in Table 2.
Table 2: Curve Choices Resident in the SEL-351R Recloser
Control
Curve Type Curve Choices
All TraditionalRecloser Curves
A, B, C, D, E, F, G, H, J, KP, L, M, N, P, R, T, V,W, Y, Z, 1,
2, 3, 4, 5, 6, 7, 8, 8PLUS, 9, KG, 11,13, 14, 15, 16, 17, 18
US Curves moderately inverse, inverse, very inverse,extremely
inverse, short-time inverse
IEC Curves class A (standard inverse), class B (very
inverse),class C (extremely inverse), long-time inverse,short-time
inverse
Programmable Curves(User-Designed)
Four (4) Programmable Curves
Any fast or delay curve (phase or ground) can be set with any of
the curves in Table 2. The USand IEC curves conform to IEEE
C37.112-1996 IEEE Standard Inverse-Time CharacteristicEquations for
Overcurrent Relays.
The traditional recloser curve choices in Table 2 are listed
using the older electronic controldesignations. The traditional
recloser curves can also be specified in a curve setting using
thenewer microprocessor-based control designations - the SEL-351R
works with either designation.For example, a given traditional
recloser curve has the following two designations:
Older electronic control designation: A
Newer microprocessor-based control designation: 101
Traditional recloser curve A and 101 are the same curve - use
either designation in making curvesettings in the SEL-351R.
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12
Four (4) user-designed curves (created with a software package)
can be downloaded to the SEL-351R. The fast and delay curves (phase
or ground) can be set with the user-designed curves orthe curve
choices in Table 2.
Fast and delay curves (including US or IEC curve choices) can be
modified with traditionalrecloser control curve modifiers:
constant time adder - adds time to curve vertical multiplier
(time dial) - shifts whole curve up or down in time minimum
response time - holds off curve tripping for minimum time high
current trip - instantaneous trip with optional time delay high
current lockout - high-set lockout threshold
Fast and delay curves using US or IEC curve choices from Table 2
can be set withelectromechanical induction-disc emulation reset if
desired. This feature is useful in situationswhere the relay to the
source-side of the SEL-351R is an electromechanical relay.
For example, for a fault to the load-side of the SEL-351R, the
source-side electromechanicalrelay also times. When the recloser
interrupts the fault, the source-side electromechanical relaystarts
to reset. If the fast or delay curve reset emulates an
electromechanical relay, then source-side electromechanical relay
and the SEL-351R reset in tandem. When the recloser is
auto-reclosed back into the fault - the fast or slow curve of the
SEL-351R starts to time from where itis, if not yet fully reset.
This keeps the source-side electromechanical relay from ratcheting
totrip for repetitive reclosures by the SEL-351R into the load-side
fault.
Front-panel target LEDs indicate any overcurrent trip in general
(TRIP LED) and thendiscriminate a fast curve trip (FAST CURVE LED)
or a high current trip (HIGH CURRENT).See Figure 8 and Table 1.
Sensitive Earth Fault (SEF) ElementA sensitive earth fault (SEF)
element with time delay (up to 16,000 cycles) can be set as
sensitiveas 5 A primary (assuming nominal recloser ct ratio of
1000:1). Current channel IN with a 0.05 Asecondary nominal rating
provides this sensitivity (see Figure 7 and accompanying
notes).Front-panel target LEDs indicate any SEF element trip with
the SEF LED (see Figure 8 andTable 1).
Custom Overcurrent Protection
If the user wants to customize the overcurrent protection, the
corresponding SELOGIC ControlEquations can be reprogrammed at a
higher logic level.
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13
Recloser Wear Monitor Feature = Intelligent Recloser Maintenance
Scheduling
Reclosers experiencemechanical and electricalwear every time
they operate.The recloser wear monitorfeature measures unfiltered
accurrent at the time of trip andthe number of
close-to-openoperations as a means ofmonitoring this wear.
Every time the recloser trips,the relay records themagnitude of
the raw currentin each phase. This currentinformation is integrated
on aper phase basis. Figure 10: Recloser Contact Wear Curve and
Settings
When the result of this integration exceeds the threshold set by
the recloser wear curve, theSEL-351R asserts a logic point for the
affected phase. This logic point can be routed foralarming or to
modify reclosing (e.g., shorten the number of reclosures). This
method ofmonitoring recloser wear is solidly based on methods of
breaker rating from breaker manufacturers.
Figure 10 shows three setpoints needed to emulate a breaker wear
curve. These setpoints are setautomatically by the SEL-351R,
following recommendations for reclosers in ANSI C37.61-1973.Only
the recloser type (oil or vacuum) and the interrupt rating have to
be entered.If the user wants to customize the recloser wear curve,
the setpoints in Figure 10 can beprogrammed at a higher logic
level.
Intelligent Battery Monitor/Charger
Refer to the Figure 7.
When 120 Vac power is interrupted, 24-volt, 8.0 Amp-hour sealed
lead-acid batteries supplypower to the SEL-351R. The
temperature-compensated battery monitor/ charger monitorsbattery
capacity, measures power supply load current, and calculates
expected battery run time.A fully charged 8.0 Amp-hour battery
supplies the trip and control power for 10 to 24 hoursdepending on
ambient temperature and load.
After battery capacity discharges to a user-set threshold, the
SEL-351R puts itself to sleep. The12 Vdc can be kept on to power a
radio during the sleep mode.
The SEL-351R can be programmed to issue a trip to sectionalize
the dead line before going tosleep. When power is restored, the
system can then be restored section by section.
The recloser control wakes up if any of the following occur:
120 Vac power is restored a specific message is received by the
EIA-232 wake-up port (see Figure 7) the WAKE UP operator control is
pressed (see Figure 8)
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14
The control reports battery health in the diagnostic self-test
status reports. Regardless of batteryhealth, the SEL-351R can trip
and close the recloser from the 120 Vac power.
Load Profile
The SEL-351R logs up to 15 user-selected values into the load
profile buffer. These values canbe virtually any analog value
(e.g., current, demand current, voltage, MW, MVAR, MWh,MVARh). Set
the data logging interval from 5 to 60 minutes. The SEL-351R stores
up to 40days of data for a load profile of 15 values logged every
15 minutes.
Note: With a single phase voltage connection, no power or energy
values are available.
Event Reporting and SER
Event reports are automatically triggered at fault inception and
when the SEL-351R issues a trip.Event report length is selectable:
15 or 30 cycles. The current, voltage, frequency, and elementstatus
information contained in each report confirms performance of the
control, scheme, andsystem for every fault. The latest twenty-eight
15-cycle event reports (or fourteen 30-cycle longevent reports) are
stored in nonvolatile memory. Decide how much detail is necessary
when yourequest an event report: 1/4-sample/cycle or
1/16-sample/cycle filtered or unfiltered analog data.
The control adds lines in the sequential events recorder (SER)
report for a change of state ofprogrammed conditions. The control
stores the latest 512 lines of the SER report in nonvolatilememory.
Use SER reports to gain a broad perspective of system performance
at a glance -especially an auto-reclosing sequence.
Event reports and SER reports are date- and time-stamped. The
IRIG-B time-code inputsynchronizes the SEL-351R time to within 5 ms
of the time-source input. A convenient sourcefor this time code is
the SEL-2020 or SEL-2030 Communications Processor (see Figure
9).
Remote Control
Remote control of the SEL-351R can be accomplished via the:
serial ports optoisolated inputs/output contacts connected to
SCADA (see Figure 7)
The user can customize the remote control (and its hierarchy
with front-panel operator control -see bottom of Figure 8) by
programming SELOGIC Control Equations at a higher logic level.
NEW FEATURES AVAILABLE WITH THE SEL-351R RECLOSER CONTROLFigure
1 shows an SEL-351R retrofitted into a traditional installation,
where single-phase 120Vac power is the only voltage brought to the
control. Even this installation has the first elevenbulleted key
features listed on the front cover. The new features available with
the SEL-351Rare described in this subsection.
-
15
Underfrequency Load Shedding
The SEL-351R underfrequency load shedding element has a pickup
range of 40.10 - 65.00 Hzwith a time delay settable up to 16,000
cycles. Figure 2 gives an example application forunderfrequency
load shedding.
Front-panel target LEDs indicate any underfrequency load
shedding trip with the 81 LED (seeFigure 8 and Table 1).Five (5)
additional frequency elements are available in the SEL-351R. Use
these extra elementsfor additional underfrequency load shedding
levels (with varying time delays) or to provide afrequency window
for load restoration. These extra frequency elements can be
accessed at ahigher logic level.
Relay-to-Relay Digital Communications (Mirrored Bits
Technology)The SEL patented Mirrored Bits technology provides
bidirectional relay-to-relay digitalcommunications. Figure 4 gives
an example application for Mirrored Bits. Mirrored Bits canoperate
independently on up to two EIA-232 serial ports on a single
SEL-351R. With MirroredBits operable on two serial ports, there is
communication upstream and downstream from theSEL-351R site.
This bidirectional digital communication creates eight
additional virtual outputs (transmittedMirrored Bits) and eight
additional virtual inputs (received Mirrored Bits) for each serial
portoperating in the Mirrored Bits mode. These Mirrored Bits can be
used to transmit/receiveinformation in communications-aided
tripping schemes (e.g., permissive overreaching transfertripping)
and other control functions (e.g., cancel reclosing). Mirrored Bits
also help reduce totalscheme operating time by eliminating the need
to assert output contacts to transmit information.
Enhanced SELOGIC Control Equations
SELOGIC Control Equations provide the reserve horsepower in the
SEL-351R for implementingnecessary custom protection and control
schemes. All SEL-351R logic is already set at thefactory in the
SELOGIC Control Equations. If the user wants to customize the
logic, the SELOGICControl Equations can be reprogrammed at a higher
logic level. This can be done separately foreach setting group, so
a different scheme can be had in each setting group (see following
multiplesetting groups discussion).Programming SELOGIC Control
Equations consists of combining relay elements (e.g.,
voltage,overcurrent), inputs, reclosing states, etc. with SELOGIC
Control Equation operators to driveoutput contacts and other
settable parameters.
The SELOGIC Control Equation operators included are:
+ OR One element on either side of a + symbol must assert before
the condition is true.
* AND Elements on both sides of the * symbol must assert before
the condition is true.
! Invert (NOT) Inverts the value of the element immediately
following the ! symbol.( ) Parentheses Enclose elements, inputs,
etc., inside these parentheses to be operated on
by the +, !, or * operators. Use these parentheses in the
SELOGIC Control Equations tominimize setting entries.
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16
/ Rising Edge Produces a logic 1 pulse for one processing
interval following a risingedge of the element immediately
following the / symbol.
\ Rising Edge Produces a logic 1 pulse for one processing
interval following a fallingedge of the element immediately
following the \ symbol.
In addition to Boolean-type logic, 16 general purpose SELOGIC
Control Equation timers eliminatethe need for external timers for
custom protection or control schemes. Each timer hasindependent
time-delay pickup and dropout settings (six timers settable up to
999,999 cycles andten timers settable up to 16,000 cycles). Program
the input to a timer with any desired element(e.g., time qualify a
voltage element). Assign the timer output to trip logic, reclose
logic, or othercontrol scheme logic.
Multiple Setting Groups
The relay stores six setting groups. Switch the active setting
group with the front-panel GROUPpushbutton (see Figure 8), a serial
port command, or other programmable conditions (e.g.,
viaoptoisolated inputs). Use these setting groups to cover a wide
range of protection and controlcontingencies. Selectable setting
groups make the SEL-351R ideal for applications requiringfrequent
setting changes and for adapting the protection to changing system
conditions.
When the active setting group is switched, the settings (e.g.,
overcurrent and reclosing) as well asthe logic (implemented in
SELOGIC Control Equations) is switched, too. Setting groups can
beprogrammed for different operating conditions, such as feeder
paralleling, station maintenance,seasonal operations, emergency
contingencies, loading, source changes, and downstream
reclosersetting changes.
Use the ALTERNATE SETTINGS operator control (see Figure 8) to
switch the active settinggroup between setting group 1 (main
setting group) and setting group 2 (alternate setting
group).Switching the active setting group with the front-panel
GROUP pushbutton (see Figure 8) or aserial port command requires a
password.
FULL CAPABILITY AVAILABLE WHEN ALL VOLTAGES ARE CONNECTED TO
THESEL-351R RECLOSER CONTROL
When true three-phase voltage and synchronism-check voltage are
connected to the SEL-351R asshown in Figure 3, the additional key
features listed at the bottom of the front cover are gained.These
additional, new features available with the SEL-351R are described
in this subsection.
The voltage elements, synchronism-check elements, directional
overcurrent elements, loss-of-potential logic,
communications-assisted trip logic, and load encroachment logic can
be accessedat a higher logic level.
Under- and Overvoltage Elements
Many phase, phase-to-phase, and sequence undervoltage (27) and
overvoltage (59) elements areavailable for application in numerous
schemes:
hot-bus/dead line or dead bus/hot line auto-reclosing control
blown transformer high-side fuse detection voltage sag and swell
detection (trip, alarm, or trigger event reports)
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17
undervoltage (27) load shedding (use both 27 and 81U
load-shedding schemes to detectsystem MVAR and MW deficient
conditions, respectively) capacitor bank control
Synchronism-Check Elements
Besides providing under- and overvoltage elements, voltage
channel VS can also be used forsynchronism-check. Voltage channel
VS synchronism checks with user-selected phase VA, VB, orVC. Two
synchronism-check elements are available for such applications
as:
one synchronism-check element for automatic reclosing the other
synchronism-check element for manual/remote closing
Alternatively, voltage channel VS can be connected at many other
power system points (e.g.,ungrounded capacitor neutral or broken
delta potential transformer connection).
Fault Locator Reduces Line Patrol and Outage Time
The SEL-351R accurately locates all faults, even during periods
of substantial load flow. Thefault locator uses fault type, replica
line impedance settings, and fault conditions to provide anaccurate
estimate of fault location without communications channels, special
instrumenttransformers, or prefault information.
Complete Metering CapabilitiesExtensive and accurate metering
capabilities are provided by the SEL-351R. VA,B,C and
IA,B,Cmetering accuracies, and power measurement accuracies are
provided in the TechnicalSpecifications section.Metered quantities
include phase voltages and currents (including demand), sequence
voltagesand currents, power, frequency, and energy (including
demand) along with maximum/minimumlogging of selected quantities.
All metered quantities are reported in primary quantities
(currentin A primary and voltage in kV primary):
Currents IA,B,C,N Input currentsIG Residual ground current (IG
=3I0 = IA + IB + IC)
Voltages VA,B,C Wye-connected voltage inputsVS Synch-check
voltage input
Power MWA,B,C Single-phase megawattsMW3P Three-phase
megawattsMVARA,B,C Single-phase megavarsMVAR3P Three-phase
megavars
Energy MWhA,B,C Single-phase megawatt hoursMWh3P Three-phase
megawatt hoursMVARhA,B,C Single-phase megavar hoursMVARh3P
Three-phase megavar hours
Power Factor PFA,B,C,3P Single- and three-phase power factor;
leading orlagging
Sequence I1, 3I2, 3I0 Positive-, negative-, and zero-sequence
currents
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18
V1, V2, 3V0 Positive-, negative-, and zero-sequence voltages
Frequency FREQ (Hz) Instantaneous power system frequency
(monitoredon channel VA)
If true three-phase voltage is not connected, the voltage
(VA,B,C), MW/MVAR, MWh/MVARh,and power factor metering values are
not available.
Directional Overcurrent Elements
Phase and ground directional elements are standard features of
the SEL-351R. The SEL-351Rincludes Best Choice Ground Directional
Logic, which, if enabled, selects the best grounddirectional
element for the system conditions.
Phase directional elements provide directional control of phase
and negative-sequenceovercurrent elements. The phase overcurrent
elements may be controlled by positive-sequencevoltage-polarized
and negative-sequence voltage-polarized directional elements, which
worktogether. The positive-sequence voltage-polarized directional
element includes over 29 cycles ofmemory. Thus, this directional
element gives a reliable output even for close-in, forward-
orreverse-bolted, three-phase faults where each phase voltage is
zero.
Ground directional elements provide directional control to the
neutral ground and residualground overcurrent elements. Ground
directional control is provided by two directional elementsworking
together: a negative-sequence voltage-polarized element similar to
that used in the phasedirectional element and a zero-sequence
voltage-polarized directional element which uses thesame principle
as the negative-sequence directional element.
The negative-sequence directional element uses the same patented
principle proven in our SEL-321 Relay. This directional element can
be applied in virtually any application (regardless of theamount of
negative-sequence voltage available at the relay location). The
zero-sequencedirectional element is also patented.
Loss-of-Potential Logic Validates Three-Phase Voltage Inputs
Relay functions that use phase voltages or that use symmetrical
component voltages (e.g.,metering, directional elements, fault
location) rely upon valid input voltages to make the
correctdecisions. The SEL-351R includes loss-of-potential logic
that detects one, two, or three blownpotential fuses. This logic is
unique as it does not require settings and is suited to
allapplications.
Communications-Assisted Trip Logic for Rapid Fault Clearance
Use communication channels to improve the sensitivity,
coordination, and speed of protection.Increasing in-section trip
speed decreases the fault-induced voltage sag to the
surroundingfeeders. The SEL-351R is the ideal solution for use in
distribution feeder communications-basedtripping schemes. All
schemes except DTT should include current reversal logic which
requirestrue three-phase voltage connections. Schemes supported
include:
Permissive Overreaching Transfer Tripping (POTT) Directional
Comparison Unblocking (DCUB) Directional Comparison Blocking (DCB)
Permissive and Direct Underreaching Transfer Trip (PUTT and DUTT,
respectively)
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19
Direct Transfer Tripping (DTT)The communications-assisted trip
logic of the SEL-351R easily handles the following:
Current reversals Breaker open at one terminal Weak-infeed
conditions at one terminal Switch-onto-fault conditions
Time-step and time-overcurrent backup protection ensures
reliable operation should the channelbe lost.
Load Encroachment Logic
The SEL-351R contains patented load-encroachment logic which
allows phase overcurrentelements to be set securely below maximum
expected load to detect end-of-line three-phasefaults in heavily
loaded feeder applications.
Figure 11: Load Encroachment Characteristics
Load-encroachment logic usespositive-sequence load-in and
load-out region elements to discriminatebetween load and fault
conditions.
When the load impedance (Z1)resides in a load region, the
phaseovercurrent elements are blocked.As Figure 11 shows, when a
three-phase fault occurs, Z1 moves from aload region to the line
angle, and thephase overcurrent elements areunblocked.
Load encroachment logic also controls the phase-directional
element. Therefore, torque-controlling phase-overcurrent elements
with the phase-directional element automaticallyincludes load
encroachment torque control. External input torque control of the
phase-overcurrent elements is also available.
-
20
TECHNICAL SPECIFICATIONS
General Specifications
Battery ChargerAc Voltage Input
Input Power: 106 - 140 Vac, 120 Vac nominal.
12 Vdc Output 11 - 14 Vdc, 6 W continuous, 13 W for 1
second.
Ac Voltage Inputs Voltage Inputs VA, VB, VC, and VS.300 VL-N
continuous (connect any voltage up to 300 Vac). 600 VL-N for
10seconds.Burden: 0.03 VA @ 67 V; 0.06 VA @ 120 V; 0.8 VA @ 300
V.
Ac CurrentInputs
1 A nominal: 3 A continuous, 100 A for 1 second, linear to 20 A
symmetrical.250 A for 1 cycle.Burden: 0.13 VA @ 1 A, 1.31 VA @ 3
A.
Sensitive Earth Fault:
0.05 A nominal channel IN current input: 1.5 A continuous, 20 A
for 1 second,linear to 1.5 A symmetrical.100 A for 1 cycle.Burden:
0.0004 VA @ 0.05 A, 0.36 VA @ 1.5 A.
Frequency andRotation
60/50 Hz system frequency and ABC/ACB phase rotation are
user-settable.Frequency tracking range: 40.1 - 65 Hz (VA required
for frequency tracking, butmay be supplied by control ac power
source - see Figure 7).
Output ContactsExcept Trip and
Close
Per IEC 255-0-20 : 1974, using the simplified method of
assessment:6 A continuous carry30 A make per IEEE C37.90 : 1989100
A for one second270 Vac/360 Vdc MOV for differential surge
protectionPickup/dropout time: < 5 msBreaking Capacity (L/R = 40
ms):
24 V 0.5 A 10,000 operations48 V 0.5 A 10,000 operations
125 V 0.3 A 10,000 operations250 V 0.2 A 10,000 operations
Cyclic Capacity (L/R = 40 ms):24 V 0.5 A 2.5 cycles per second48
V 0.5 A 2.5 cycles per second
125 V 0.3 A 2.5 cycles per second250 V 0.2 A 2.5 cycles per
second
Trip and CloseOutputs
5 A make and carry for 0.2 seconds repetitive.60 Vdc
continuous.
OptoisolatedInput Ratings
250 Vdc: on for 200 - 300 Vdc; off below 150 Vdc125 Vdc: on for
105 - 150 Vdc; off below 75 Vdc
48 Vdc: on for 38.4 - 60 Vdc; off below 28.8 Vdc24 Vdc: on for
16.0 - 30 Vdc.
With nominal control voltage applied, each optoisolated input
draws approximately4 mA of current.
-
21
Time-Code Input Relay module accepts demodulated IRIG-B
time-code input at Port 1 and Port 2(Port 1 is an optional EIA-485
port). Do not connect the time-code input into bothPort 1 and Port
2 at the same time. Relay time is synchronized to within 5 ms
oftime-source input.
SerialCommunications
Two side-panel and one front-panel EIA-232 serial communications
ports.One optional side panel EIA-485 serial port with 2100 Vdc of
isolation.
Per-port baud rate selections: 300, 1200, 2400, 4800, 9600,
19200, 38400.
Routine DielectricTest
Control ac power: 2500 Vac for 10 seconds.Optional power supply
inputs, optoisolated inputs, analog inputs, and outputcontacts
except Trip and Close: 3100 Vdc for 10 seconds.
Operating Temp. Relay module: -40 to +85C (-40 to +185F)[LCD
contrast impaired for temps. below -20C (-4F)]
Batteries: -40 to +60C (-40 to +140F)Entire SEL-351R unit: -40
to +50C (-40 to +122F)The entire SEL-351R unit was operation tested
up to +70C (+158F). The 20C(36F) difference between the +50C rating
and +70C allows for temperature risedue to sunlight.
Battery Specs. Normal Capacity: 8.0 amp-hours at +25C (+77F)Run
Time: 20 hours at +25C (+77F), 9 hours at -40C (-40F)
The above run times presume the following global EZ settings are
made:%Battery capacity for sleep = 0% (no battery capacity
retained)Turn on the 12 V power = N (12 Vdc power off)
Estimated Life: 4 years at +25C (+77F), 8 months at +60C
(+140F)Recharge Time: 55 hours at +25C (+77F)
Environment IEC 68-2-30 - 1980 Basic environmental testing
procedures, Part 2: Test - TestsCa; Damp heat, cyclic. Severity
Level: (12 + 12-hr cycle).IEC 529 - 1989 Degrees of protection
provided by enclosures - IP32/NEMA 3R(type test).
RFI andInterference Tests
ANSI/IEEE C37.60.6.12 - 1981 Cable Charging Current Interrupting
test forautomatic circuit reclosers and fault interrupters for AC
systems, 5 Amp rmscharging current interrupted, 20 close-open
operations, randomly timed (type testwith a McGraw-Edison VWVE
recloser rated for 27 kV, 12 kA interrupting, 560Amp
continuous).ANSI/IEEE C37.60.6.13 - 1981 Transformer Magnetizing
Current Interruptiontest for automatic circuit reclosers and fault
interrupters for AC systems,magnetizing current interrupted equal
to 3 1/2% of the continuous current rating ofthe recloser, 20
close-open operations, randomly timed (type test with a
McGraw-Edison VWVE recloser rated for 27 kV, 12 kA interrupting,
560 Amp continuous).ANSI/IEEE C37.60.6.14 - 1981 Control Elements
SWC tests for automatic circuitreclosers and fault interrupters for
AC systems, Oscillatory Surge Test method,6.14.1, applied to
control element connections to external devices, 1.0 to 1.5
MHzoscillatory test wave of crest voltage of 2.5 - 3.0 kV occurring
in the first half-cycle, decaying to 50% in not less than 6 s.
IEEE C37.90.1 - 1989 IEEE SWC Tests for Protective Relays and
Relay Systems(3 kV oscillatory, 5 kV fast transient) (type
test).
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22
IEEE C37.90.2 - 1987 IEEE Trial-Use Standard, Withstand
Capability of RelaySystems to Radiated Electromagnetic Interference
from Transceivers, 10 V/m(type test with enclosure door open).
Exceptions:
5.5.2(2) Performed with 200 frequency steps per octave.5.5.3
Digital Equipment Modulation Test not performed.5.5.4 Test signal
turned off between frequency steps to simulate
keying.IEC 801-4 - 1988 Electromagnetic compatibility for
industrial-processmeasurement and control equipment, Part 4:
Electrical fast transient/burstrequirements, Severity Level: 4 (4
kV on optional power supply, 2 kV on inputsand outputs) (type
test).IEC 255-22-1 - 1988 Electrical disturbance tests for
measuring relays andprotection equipment, Part 1: 1 MHz burst
disturbance tests. Severity Level 3(2.5 kV common mode, 1.0 kV
differential) (type test).IEC 255-22-3 - 1989 Electrical relays,
Section 3: Radiated electromagnetic fielddisturbance tests,
Severity Level: 3 (10 V/m) (type test).IEC 255-22-4 - 1992
Electrical disturbance tests for measuring relays andprotection
equipment, Section 4: Fast transient disturbance test (type
test).
Impulse Tests ANSI/IEEE C37.60.6.2 - 1981 Insulation
(Dielectric) tests for automatic circuitreclosers and fault
interrupters for AC systems, 1.2 50 s voltage impulse(positive and
negative) of crest voltage of 125 kV, applied to recloser with
controlconnected (type test with a McGraw-Edison VWVE recloser
rated for 27 kV, 12kA interrupting, 560 Amp continuous).IEC 255-5 -
1977 Electrical relays, Part 5: Insulation tests for electrical
relays,Section 6: Dielectric Tests, Series C (2500 Vac on analog
inputs including controlac power; 3100 Vdc on optional power supply
inputs, contact inputs, and contactoutputs excluding Trip and
Close). Section 8: Impulse Voltage Tests, 0.5 Joule, 5kV (type
test).
Vibration andShock Test
IEC 255-21-1 - 1988 Electrical relays, Part 21: Vibration,
shock, bump, andseismic tests on measuring relays and protection
equipment, Section 1 - Vibrationtests (sinusoidal), Class 1 (relay
module only).IEC 255-21-2 - 1988 Electrical relays, Part 21:
Vibration, shock, bump, andseismic tests on measuring relays and
protection equipment, Section 2 - Shock andbump tests, Class 1
(relay module only).IEC 255-21-3 - 1993 Electrical relays, Part 21:
Vibration, shock, bump, andseismic tests on measuring relays and
protection equipment, Section 3 - Seismictests, Class 2 (relay
module only).
ESD Test IEC 255-22-2 - 1996 Electrical disturbance tests for
measuring relays andprotective equipment, Section 2: Electrostatic
discharge tests, Severity Level: 4(8 kV contact discharge all
points except serial ports, 15 kV air discharge to allother points)
(type test).
Burn-in Twenty temperature cycles from ambient to 75C (167F)
over 48 hours.
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23
Relay Element Pickup Ranges and Accuracies
Instantaneous/Definite-Time Overcurrent Elements
Pickup Range: 0.05 - 20.00 A, 0.01 A steps (1 A nominal)0.20 -
34.00 A, 0.01 A steps (1 A nominal - forphase-to-phase
elements)0.005 - 1.500 A, 0.001 A steps (0.05 A nominalchannel IN
current input)
Steady-State Pickup Accuracy: 0.01 A and 3% of setting (1 A
nominal)1 mA and 5% of setting (0.05 A nominalchannel IN current
input)
Transient Overreach: 5% of pickupTime Delay: 0.00 - 16,000.00
cycles, 0.25-cycle stepsTimer Accuracy: 0.25 cycle and 0.1% of
setting
Time-Overcurrent Elements
Pickup Range: 0.10 - 3.20 A, 0.01 A steps (1 A nominal)0.005 -
0.160 A, 0.001 A steps (0.05 A nominalchannel IN current input)
Steady-State Pickup Accuracy: 0.01 A and 3% of setting (1 A
nominal)1 mA and 5% of setting (0.05 A nominalchannel IN current
input)
Time Dial Range: 0.50 - 15.00, 0.01 steps (US)0.05 - 1.00, 0.01
steps (IEC)0.10 - 2.00, 0.01 steps (recloser curves)
Curve Timing Accuracy: 1.50 cycles and 4% of curve time
forcurrent between 2 and 30 multiples of pickup
Under- and Overvoltage Elements
Pickup Ranges: 0.0 - 150.0 V, 0.1 V steps (various elements)0.0
- 260.0 V, 0.1 V steps (phase-to-phaseelements)
Steady-State Pickup Accuracy: 1 V and 5% of setting
Transient Overreach: 5% of pickup
Synchronism-Check Elements
Slip Frequency Pickup Range: 0.005 - 0.500 Hz, 0.001 Hz
stepsSlip Frequency Pickup Accuracy: 0.003 Hz
Phase Angle Range: 0 - 80, 1 stepsPhase Angle Accuracy: 2
-
24
Under- and Overfrequency Elements
Pickup Range: 40.10 - 65.00 Hz, 0.01 Hz stepsSteady-State plus
Transient Overshoot: 0.01 Hz
Time Delay: 2.00 - 16,000.00 cycles, 0.25-cycle stepsTimer
Accuracy: 0.25 cycle and 0.1% of setting
Timers
Pickup Ranges: 0.00 - 999,999.00 cycles, 0.25-cycle
steps(reclosing relay and some programmable timers)0.00 - 16,000.00
cycles, 0.25-cycle steps (someprogrammable and other various
timers)
Pickup and dropout accuracy for all timers: 0.25 cycle and 0.1%
of setting
Metering Accuracy
Accuracies are specified at 20C and at nominal system frequency
unless noted otherwise.
Voltages VA, VB, VC, VS, 3V0, V1, V2 0.2% (33.5 - 150 V)Currents
IA, IB, IC 3.0 mA and 0.1% (0.1 - 2 A) (1 A nominal)
Temperature coefficient:[(0.0002%)/(C)2] * (__C - 20C)2
(see example below)Currents IN, I1, 3I0, 3I2 0.01 A and 3% (0.1
- 20 A) (1 A nominal)1 mA and 5% (0.01 - 1.5 A) (0.05 Anominal
channel IN current input)
Phase Angle Accuracy 1.0
Metering accuracy calculation example for currents IA, IB, and
IC due to preceding statedtemperature coefficient:
For temperature of 40C, the additional error for currents IA,
IB, and IC is:[(0.0002%)/(C)2] * (40C - 20C)2 = 0.08%
-
25
ENCLOSURE DIMENSIONS
Ground ing Lug
Contro lCab le
Receptac le
D W G : M 3 5 1 R 0 4 2
1/4" (6.4 mm) dia. holes(6 hole plugs instal led) 1-3/8" (34.9
mm)
dia. holes (2 holeplugs instal led)
1/8" (3.2 mm) holes for #4-40screws (8 hole plugs instal
led)
3/8" (9.5 mm) holefor customer lock
7/8" (22.2 mm) dia. holes(1 vent and 2 hole plugsinstal led)
1-1/4"(31.8 mm)
11-1/4"(285.8 mm)
1-2/10"(30.5 mm)
14-1/4"(362.0 mm)
3"(76.2 mm)
1-3/8"(34.9 mm)
1-3/8"(34.9 mm)
2"(50.8 mm)
1/8" (3.2 mm) holes(4 screws instal ledfor battery tray)
Figure 12: SEL-351R Recloser Control Grounding Lug Location and
Other DimensionalInformation (Bottom View)
-
26
11
-1/4
"(28
5.8 m
m)14
-1/4
"(36
2.0 m
m)
D W G : M 3 5 1 R 0 0 7
FRO
NTSI
DEBA
CK
BO
TTO
MDW
G:M
351R
041
20-1
/8"
(511.2
mm)24
-5/8
"(62
5.5 m
m)
18"
(457.2
mm)
Mou
ntin
g ho
les/
slots
for
5/8"
(16 m
m) bo
lts
1-1/
4" (3
1.8 m
m) di
a.ho
les
for l
iftin
g
SEL
drill
plan
Trad
itiona
ldr
ill pl
an
27"
(685.8
mm)
22"
(558.8
mm)
Figure 13: SEL-351R Recloser Control Dimensions and Mounting
Drill Plan
-
27
SEL SERVICE AND WARRANTY
FACTORY ASSISTANCEThe employee-owners of Schweitzer Engineering
Laboratories, Inc. are dedicated to makingelectric power safer,
more reliable, and more economical.
We appreciate your interest in SEL products, and we are
committed to making sure you aresatisfied. If you have any
questions, please contact us at:
Schweitzer Engineering Laboratories, Inc.2350 NE Hopkins
CourtPullman, WA USA 99163-5603Tel: (509) 332-1890Fax: (509)
332-7990We guarantee prompt, courteous, and professional
service.
We appreciate receiving any comments and suggestions about new
products or productimprovements that would help us make your job
easier.
NEW PRODUCT WARRANTYAll new products sold to customers are
warranted against defects in design, materials, andworkmanship for
a period of ten (10) years from the date of first retail delivery
to a customer. Ifit is determined that the new product defect is
covered under this warranty, SEL will repair,replace, or substitute
an identical unit at its own discretion to the customer at no
charge.
Note: The 24 Vdc battery inside the SEL-351R enclosure is
excluded from the warranty.
SEL may, at its own discretion, require the customer to ship the
unit back to the factory fordiagnosis before making a determination
as to whether it is covered by this warranty. In suchevent, SEL
may, at its own discretion, decide to provide the customer with a
substitute unitwhich may be sent to the customer either from the
SEL factory or from an authorized represen-tative or distributor
from their inventory.
All expenses related to the shipment of defective units back to
SEL or the provision of a substi-tute unit to the customer are the
responsibility of the customer. This expense may include, but isnot
limited to, freight, insurance, Customs clearance, and duties. All
expenses related to theshipment of repaired units back to customers
(or the provision of a new unit to the customer) willbe borne by
SEL.
-
All brand or product names appearing in this document are the
trademark or registered trademark of their respective holders.
Schweitzer Engineering Laboratories, Inc., SELOGIC, and are
registered trademarks of Schweitzer Engineering Laboratories,
Inc.
This document is covered by U.S. Patent Nos: 5,208,545;
5,317,472; 5,602,707; 5,515,227; 5,652,688; 5,349,490; 5,365,396;
5,041,737;5,479,315; and 5,694,281.
Foreign Patents issued and other U.S. and Foreign Patents
Pending.
Copyright SEL 1998 (All rights reserved) Printed in USA.
SEL-351R Recloser Control 981216
2350 NE Hopkins Court
Pullman, WA
USA
99163-5603
Phone: (509) 332-1890
Fax: (509) 332-7990
E-mail: [email protected]