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Siemens Transmission and Distribution Ltd PO BOX 98 Tel: +44
(0)191 401 5510 North Farm Road Fax: +44 (0)191 401 5580 Hebburn
Tyne & Wear NE31 1LX
A Siemens Company. Registered Number 631825 Registered Office:
Siemens House, Oldbury, Bracknell, Berkshire RG12 8FZ, England
Siemens Integrated Substation Condition Monitoring System
Circuit Breaker Monitoring
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Siemens Transmission and Distribution Ltd PO BOX 98 Tel: +44
(0)191 401 5510 North Farm Road Fax: +44 (0)191 401 5580 Hebburn
Tyne & Wear NE31 1LX
A Siemens Company. Registered Number 631825 Registered Office:
Siemens House, Oldbury, Bracknell, Berkshire RG12 8FZ, England
System Description Introduction The Circuit Breaker Monitor
[CBM] is only one example of the way that the Substation Monitoring
[SM] System can be config ured and applied. The SM system has
multiple monitoring applications. The system has been designed to
bring all elements of plant monitoring onto one platform. The CBM
system as outlined in Figure 1, can be applied for AIS and GIS
substations. The system is modular and designed to facilitate all
measurements associated with the operation of one bay of
switchgear. In order to simplify the signal cabling the monitoring
equipment is located in the Local Control Cubicle [LCC] which
provides close proximity to the transducers and other signal
sources. This also allows for a very simple communications
connection to transmit all of the bay data along a single fibre
cable. The communications system is a TCP/IP protocol provided by a
Windows XP operating system which provides a very flexible
interface for most substation and external [remote office]
networks.
Figure 1. Monitoring System Layout
A compact PCI industrial computer system and data acquisition
cards provides the data capture and data storage facility. A range
of transducers and transducer types provide the signal input to the
specially designed signal conditioning modules. The signal
conditioning modules provide the data input to the data acquisition
cards. Also
CBM Bay Units
Central Rack Mounted PC
Fibre Optic Comms
LCC
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Siemens Transmission and Distribution Ltd PO BOX 98 Tel: +44
(0)191 401 5510 North Farm Road Fax: +44 (0)191 401 5580 Hebburn
Tyne & Wear NE31 1LX
A Siemens Company. Registered Number 631825 Registered Office:
Siemens House, Oldbury, Bracknell, Berkshire RG12 8FZ, England
these modules provide a bay alarm in the event of set
performance limits being exceeded. In order to overcome possible
noise interference and to eliminate ground loops, a radial, fibre
optic communications system connects the individual Bay Units to a
Central Data Storage PC located in the control room. This PC
provides access to review the monitoring system data and to give a
visual description of alarms. Remote communications via LAN, WAN or
modem is also provided which allows remote access to assess
substation per formance. The monitoring system can be applied
equally to AIS and GIS with the main difference being that the GIS
arrangement will require an additional SF6 Gas monitoring module.
Typically this extra module will handle up to 16 additional SF6 gas
densit y transducers and associated alarms for each circuit breaker
bay. Appendix 1 shows the Substation Monitor in an LCC [Local
Control Cubicle] during factory testing along with circuit breaker
operation records. A display screen can be included at bay leve l
for the AIS and GIS options but would most probably be used on the
GIS arrangement. The screen would display the monitoring
information and could additionally replace the bay LCC schematic
and alarm indication for equipment status, gas density readings and
alarms for example.
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Siemens Transmission and Distribution Ltd PO BOX 98 Tel: +44
(0)191 401 5510 North Farm Road Fax: +44 (0)191 401 5580 Hebburn
Tyne & Wear NE31 1LX
A Siemens Company. Registered Number 631825 Registered Office:
Siemens House, Oldbury, Bracknell, Berkshire RG12 8FZ, England
Circuit Breaker Performance Monitoring In order to monitor the
performance of the circuit breaker, key parameters such as the
contact separation speed and the operation time of the circuit
breaker, need to be recorded. The signals must be digitised at a
frequency that will provide sufficient sample points to allow
accurate and early assessment of a developing problem. The sampling
rate is set to 0.2 ms and a total of 600 ms [3000 data points per
parameter are recorded typ ically 60000 points per operation]
including a pre -event record of 100ms. The 600 ms capture period
was selected to allow sufficient data capture prior to the
operation of the circuit breaker e.g. for pre -fault analysis and
for a following Break -Make-Break circuit breaker sequence of
operation. Substation Alarm Overview and Data Access
Figure 2. Substation Alarm Overview and Data Access
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Siemens Transmission and Distribution Ltd PO BOX 98 Tel: +44
(0)191 401 5510 North Farm Road Fax: +44 (0)191 401 5580 Hebburn
Tyne & Wear NE31 1LX
A Siemens Company. Registered Number 631825 Registered Office:
Siemens House, Oldbury, Bracknell, Berkshire RG12 8FZ, England
A typical substation overview is shown in Figure 2. The screen
displays the status of all circuit breaker cond ition alarms as
well as indication of communication status. The system
automatically polls all CBM bay units every ten minutes to get the
latest information but facilities exist to manually poll at any
time. This screen also provides access to the substa tion
configuration and alarm settings screen as well as facilities for
transducers and scale settings, see Figures 3 and 4. Circuit
Breaker Alarm Settings
Figure 3. Circuit Breaker Alarm Settings
The alarm settings are user selectable to allow the application
to a wide range of circuit breakers. These alarm settings can be
changed on -line should the user wish to modify during the lifetime
of the switchgear .
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Siemens Transmission and Distribution Ltd PO BOX 98 Tel: +44
(0)191 401 5510 North Farm Road Fax: +44 (0)191 401 5580 Hebburn
Tyne & Wear NE31 1LX
A Siemens Company. Registered Number 631825 Registered Office:
Siemens House, Oldbury, Bracknell, Berkshire RG12 8FZ, England
Signals Measured and Recorded The following signals are recorded
by the monitoring system when the circuit breaker operates: Breaker
contact travel : 3 inputs Hydraulic pressure : 1 input SF6 gas
density : 1 input Trip1,Trip2,Close coil currents : 3 inputs
Auxiliary DC supply voltage : 1 input Trip/Close commands : 3
inputs AC phase currents : 3 inputs Proximity switches : 3 inputs
LCC temperature : input Ambient temperature : 1 input
Figure 4. Transducer Settings & Scales
The system has been configured to accept a wide range of
transducer types and the transducer settings fac ility allows the
user to configure the system accordingly. The facility also allows
for the replacement of transducers and any scale changes during
service life.
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Siemens Transmission and Distribution Ltd PO BOX 98 Tel: +44
(0)191 401 5510 North Farm Road Fax: +44 (0)191 401 5580 Hebburn
Tyne & Wear NE31 1LX
A Siemens Company. Registered Number 631825 Registered Office:
Siemens House, Oldbury, Bracknell, Berkshire RG12 8FZ, England
The following signals are recorded on an hourly basis by the
monitoring system: Hydraulic pressure SF6 gas density Auxiliary DC
supply voltage AC phase currents LCC temperature Ambient
temperature Hydraulic pump starts and run times are recorded as
they occur. Software Facility and Alarms The software has been
designed to allow the automatic ge neration of alarms should any of
the parameters exceed a user setting. The alarms are displayed as
shown in Figure 5 and can be user set on -line to allow a wide
range of performance related alarms to suit most circuit
breakers.
Figure 5. Bay Unit Alarm and Trend Plot Screen
The alarm settings are designated by the user as shown in Figure
3 which also allows CT ratios, Trip and Close coil values etc. to
be configured.
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Siemens Transmission and Distribution Ltd PO BOX 98 Tel: +44
(0)191 401 5510 North Farm Road Fax: +44 (0)191 401 5580 Hebburn
Tyne & Wear NE31 1LX
A Siemens Company. Registered Number 631825 Registered Office:
Siemens House, Oldbury, Bracknell, Berkshire RG12 8FZ, England
Alarms are provided as follows: SF6 Gas Density : 2 level alarms
Hydraulic Pressure : 2 level alarms Hydraulic Pump Activity :
Overrun time and total run time alarms Aux. DC Supply Voltage : 2
level alarms Main Contact Wear : 2 level alarms for I 2 t. Trip
Operation : Speed and operate time alarms Close Operation : Speed
and oper ate time alarms Trip Coil 1 Current : Peak current and
profile alarm Trip Coil 2 Current : Peak current and profile alarm
Close Coil Current : Peak current and profile alarm Closing Phase
Spread : Limit alarm LCC Temperature : Limit alarm Data Storage and
Display Trend facilities for SF6 gas density, hydraulic pressure,
Aux DC supply voltage, LCC and ambient temperature are provided for
the circuit breaker control parameters.
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Siemens Transmission and Distribution Ltd PO BOX 98 Tel: +44
(0)191 401 5510 North Farm Road Fax: +44 (0)191 401 5580 Hebburn
Tyne & Wear NE31 1LX
A Siemens Company. Registered Number 631825 Registered Office:
Siemens House, Oldbury, Bracknell, Berkshire RG12 8FZ, England
Circuit Breaker Operational Data During the operation of the
circuit breaker, more detailed information regarding the operate
times, speeds, pole scatter, switched currents etc. are measured,
calculated and stored for alarm purposes and for later viewing
should some excessive variation in operational performance be
detected . Arcing and pre-arcing times are also monitored and
stored along with the effective arc energy [ I 2 t ] for each phase
to assist with assessment of contact wear.
Figure 6. Circuit Breaker Operational Data
Figure 3 shows the display screen for th is data and
demonstrates the detail of the operational information. Statistical
operational information is enhanced by the use of graphical
displays for current, voltage, contact travel, SF6 gas density and
hydraulic pressure variations.
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Siemens Transmission and Distribution Ltd PO BOX 98 Tel: +44
(0)191 401 5510 North Farm Road Fax: +44 (0)191 401 5580 Hebburn
Tyne & Wear NE31 1LX
A Siemens Company. Registered Number 631825 Registered Office:
Siemens House, Oldbury, Bracknell, Berkshire RG12 8FZ, England
Remote Access Remote access to the CBM Control Cubicle is very
much dependent on the infrastructure available at the substation.
The most common form of access is via a modem but it is possible to
also use a Local or Wide Area Network to gain access to the data.
The remote access options are explored with each individual
customer to define the best possible solution to implement in each
case
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Siemens Transmission and Distribution Ltd PO BOX 98 Tel: +44
(0)191 401 5510 North Farm Road Fax: +44 (0)191 401 5580 Hebburn
Tyne & Wear NE31 1LX
A Siemens Company. Registered Number 631825 Registered Office:
Siemens House, Oldbury, Bracknell, Berkshire RG12 8FZ, England
Appendix 1
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Siemens Transmission and Distribution Ltd PO BOX 98 Tel: +44
(0)191 401 5510 North Farm Road Fax: +44 (0)191 401 5580 Hebburn
Tyne & Wear NE31 1LX
A Siemens Company. Registered Number 631825 Registered Office:
Siemens House, Oldbury, Bracknell, Berkshire RG12 8FZ, England
Factory Test Arrangement for Circuit Breaker Testing
Substation Monitor configured as Circuit Breaker Monitor for AIS
[Located in 420kV LCC]
Circuit Breaker Monitor Front View
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Siemens Transmission and Distribution Ltd PO BOX 98 Tel: +44
(0)191 401 5510 North Farm Road Fax: +44 (0)191 401 5580 Hebburn
Tyne & Wear NE31 1LX
A Siemens Company. Registered Number 631825 Registered Office:
Siemens House, Oldbury, Bracknell, Berkshire RG12 8FZ, England
Circuit Breaker Monitor and Transducer Terminations in 420kV
LCC
Circuit Breaker Monitor Rear View
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Siemens Transmission and Distribution Ltd PO BOX 98 Tel: +44
(0)191 401 5510 North Farm Road Fax: +44 (0)191 401 5580 Hebburn
Tyne & Wear NE31 1LX
A Siemens Company. Registered Number 631825 Registered Office:
Siemens House, Oldbury, Bracknell, Berkshire RG12 8FZ, England
Typical Circuit Breaker Monitor Trip Record [Full Record]
Typical Circuit Breaker Monitor Trip Record [Zoom Active]