ABB RET670 Commissioning Manual page 13

Transformer protection RET670 2.2 IEC
Commissioning manual
Two step undervoltage protection UV2PTUV ...........................205
Verifying the settings............................................................ 205
Completing the test.............................................................. 206
Two step overvoltage protection OV2PTOV .............................206
Verifying the settings............................................................ 206
Extended testing...................................................................207
Completing the test.............................................................. 207
Two step residual overvoltage protection ROV2PTOV ............ 207
Verifying the settings............................................................ 208
Completing the test.............................................................. 208
Overexcitation protection OEXPVPH ....................................... 208
Verifying the settings............................................................ 208
Completing the test.............................................................. 209
Voltage differential protection VDCPTOV .................................209
Check of undervoltage levels............................................... 209
Check of voltage differential trip and alarm levels................211
Check of trip and trip reset timers........................................ 212
Final adjustment of compensation for VT ratio differences . 213
Completing the test.............................................................. 213
Loss of voltage check LOVPTUV ............................................. 213
Measuring the operate limit of set values.............................213
Completing the test.............................................................. 214
Frequency protection......................................................................214
Underfrequency protection SAPTUF ........................................ 214
Verifying the settings............................................................ 214
Completing the test.............................................................. 216
Overfrequency protection SAPTOF ..........................................216
Verifying the settings............................................................ 216
Completing the test.............................................................. 217
Rate-of-change frequency protection SAPFRC ........................217
Verifying the settings............................................................ 217
Completing the test.............................................................. 218
Multipurpose protection.................................................................. 218
General current and voltage protection CVGAPC..................... 218
Built-in overcurrent feature (non-directional)........................ 218
Overcurrent feature with current restraint.............................219
Overcurrent feature with voltage restraint............................ 219
Overcurrent feature with directionality..................................220
Over/Undervoltage feature................................................... 220
Completing the test.............................................................. 221
Secondary system supervision.......................................................221
Current circuit supervision CCSSPVC.......................................221
Verifying the settings............................................................ 221
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