Download ECP 11-0224a Automatic Voltage Control Test Form

Test Form 2.24a
Installation & Commissioning Manual
Date 17/03/2011
Version 1.2
ECP 11-0224a Automatic Voltage Control Test Form
Substation
Substation Number
Circuit
1
Supply Voltage
DC Supply Voltage
Relay Type
2
AC Supply Voltage
Serial Number
Circuit Diagram Relay Designation
Inspection of Site Wiring
Insulation resistance (see test form 3.1)
()
Working to the circuit diagram, close as many series contacts as possible in order to check the
maximum possible amount of wiring. Note, electronic relays or other equipment which may be
damaged by the application of the specified test voltages shall be removed where possible or
isolated during the test to avoid damage.
Inter relay wiring and inter-unit wiring checked to:
Circuit Diagram Number ……………………………………….
()
Wiring Diagram Number ………………………………………..
()
Individual elements labelled in accordance with circuit diagram
()
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Test Form 2.24a
Installation & Commissioning Manual
ECP 11-0224a Automatic Voltage Control Test Form
3
Date 17/03/2011
Version 1.2
Mechanical Inspection
Mechanical inspection of the various DC relays is to be recorded on test form 3.5.
Record here the mechanical inspection of the voltage regulating relay and
associated AC relays
4
Secondary Injection
4.1
Voltage Regulating Relay
4.1.1
Voltage Tests
()
Voltage setting applied
()
Equivalent primary voltage of voltage transformer
()
Check bandwidth with LDC set at zero and record value (not less than 130% of
maximum voltage change per tap step)
()
Check relay inoperative when voltage reduced to below 80% of nominal voltage
()
Check relay control operative when voltage restored to 85% of nominal voltage
()
Prove Load Shed relays Stage 1, 2, and 3 provide the correct
5%, 10% and 15% load reduction progressively in that
sequence. (Effected by approximately 3%, 6 % and 9 % voltage
reduction)
Stage 1
()
Stage 2
()
Stage 3
()
4.1.2
Timing Tests
Selected fixed time delay
s
or delay characteristic equation
and applied voltage deviation (multiple of bandwidth)
Measured time delay (measured by Stopwatch)
Raise
s
Lower
s
Time delay by-passed when voltage is varied by more than 1.5 times band width
setting of the relay (where applicable)
4.2
()
Line Drop Compensation
Reactance - dial number
Compensation Settings: (to be
advised by Engineer)
Equivalent voltage/resistance/percentage
V//%
Resistance - dial number
Equivalent voltage/resistance/percentage
Prove by secondary injection the ratio and polarity of all interposing current
transformers. Check the correctness of connections for 'Resistance and
Reactance Compounding' and 'Resistance Compounding with Negative
Reactance Control'. Record details and results on test form 3.3
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V//%
()
Test Form 2.24a
Installation & Commissioning Manual
Date 17/03/2011
ECP 11-0224a Automatic Voltage Control Test Form
5
Version 1.2
Operation Tests
Prove to diagram that tap changer, operates from all control positions and that the
control selectors function correctly
()
Prove to diagram that operation of all contact combinations operate, or prevent
operation of, the appropriate relays, and that functional links, fuses, auxiliary
switches, tests switches, etc. provide the designed isolation and are correctly
labelled
()
Prove operation of Auto Control Faulty device including flag relay or other fault
indication
()
Prove correct functioning of all parallel control circuits
()
Check with simulated condition of fault on any one transformer of a group that
degrouping of the associated control is satisfactorily effected
()
Prove operation of Tap-Change Lock-out device including flag relay or other fault
indication
()
Alarms correctly initiated
6
Comments/Other Tests
7
Signature Record
Local
()
Remote
()
Contractor’s Engineer (if applicable)
Contractor
Name
Signature
Date
Signature
Date
UK Power Networks Engineer
Name
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