Hitachi RET670 Commissioning Manual page 13

1MRK 504 165-UEN Rev. K
11.5.17.1
11.5.17.2
11.5.18 Voltage-restrained time overcurrent protection VRPVOC............................................... 187
11.5.18.1
11.5.18.2
11.5.18.3
11.5.19 Average Power Transient Earth Fault Protection, APPTEF............................................ 190
11.5.19.1
11.5.19.2
11.6 Voltage protection..............................................................................................................194
11.6.1 Two step undervoltage protection UV2PTUV .................................................................194
11.6.1.1
11.6.1.2
11.6.2 Two step overvoltage protection OV2PTOV ...................................................................195
11.6.2.1
11.6.2.2
11.6.2.3
11.6.3 Two step residual overvoltage protection ROV2PTOV .................................................. 196
11.6.3.1
11.6.3.2
11.6.3.3
11.6.4 Overexcitation protection OEXPVPH ............................................................................. 197
11.6.4.1
11.6.4.2
11.6.5 Voltage differential protection VDCPTOV .......................................................................197
11.6.5.1
11.6.5.2
11.6.5.3
11.6.5.4
11.6.5.5
11.6.5.6
11.6.6 Loss of voltage check LOVPTUV ................................................................................... 202
11.6.6.1
11.6.6.2
11.7 Unbalance protection........................................................................................................ 203
11.7.1 Shunt capacitor cascading failure protection SCCFPVOC .............................................203
11.7.1.1
11.7.1.2
11.7.1.3
11.7.2 Current unbalance protection of SCB, SCUCPTOC....................................................... 205
11.7.2.1
11.7.2.2
11.7.3 Phase voltage differential based capacitor bank unbalanced protection, SCPDPTOV...209
11.7.3.1
11.7.3.2
11.7.4 Voltage unbalance protection of shunt capacitor bank, SCUVPTOV.............................. 215
Transformer protection RET670
Commissioning manual
Verifying settings by secondary injection................................................................... 185
Completing the test.................................................................................................... 187
Function revision history............................................................................................ 187
Verifying the settings.................................................................................................. 187
Completing the test.................................................................................................... 190
Verifying the signals and settings...............................................................................190
Completing the test.................................................................................................... 193
Verifying the settings.................................................................................................. 194
Completing the test.................................................................................................... 195
Verifying the settings.................................................................................................. 195
Extended testing........................................................................................................ 195
Completing the test.................................................................................................... 196
Function revision history............................................................................................ 196
Verifying the settings.................................................................................................. 196
Completing the test.................................................................................................... 197
Verifying the settings.................................................................................................. 197
Completing the test.................................................................................................... 197
Function revision history............................................................................................ 198
Check of undervoltage levels..................................................................................... 198
Check of voltage differential trip and alarm levels......................................................200
Check of trip and trip reset timers.............................................................................. 201
Final adjustment of compensation for VT ratio differences ....................................... 202
Completing the test.................................................................................................... 202
Measuring the operate limit of set values...................................................................202
Completing the test.................................................................................................... 203
Function revision history............................................................................................ 203
Verifying the signals and settings...............................................................................203
Completing the test.................................................................................................... 205
Verifying the signals and settings...............................................................................205
Completing the test.................................................................................................... 209
Verifying the signals and settings...............................................................................209
Completing the test.................................................................................................... 215
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