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Download ECP 11-0224a Automatic Voltage Control Test Form
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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 () 1 of 3 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 2 of 3 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 3 of 3