Hitachi Relion 670 Series Applications Manual page 11

1MRK506375-UEN Rev. N
8.10.3 Application.......................................................................................................................179
8.10.4 Setting guidelines............................................................................................................181
Section 9 Voltage protection..................................................................................... 183
9.1 Two step undervoltage protection U2RWPTUV................................................................ 183
9.1.1 Function revision history..................................................................................................183
9.1.2 Identification.................................................................................................................... 183
9.1.3 Application.......................................................................................................................183
9.1.4 Setting guidelines............................................................................................................184
9.1.4.1
9.1.4.2
9.1.4.3
9.1.4.4
9.1.4.5
9.2 Two step overvoltage protection O2RWPTOV.................................................................. 185
9.2.1 Function revision history..................................................................................................186
9.2.2 Identification.................................................................................................................... 186
9.2.3 Application.......................................................................................................................186
9.2.4 Setting guidelines............................................................................................................187
9.2.4.1
9.2.4.2
9.2.4.3
9.3 Two step residual overvoltage protection ROV2PTOV .................................................... 188
9.3.1 Identification.................................................................................................................... 188
9.3.2 Application.......................................................................................................................189
9.3.3 Setting guidelines............................................................................................................189
9.3.3.1
9.3.3.2
9.3.3.3
Section 10 Frequency protection................................................................................ 191
10.1 Underfrequency protection SAPTUF ................................................................................191
10.1.1 Identification.................................................................................................................... 191
10.1.2 Application.......................................................................................................................191
10.1.3 Setting guidelines............................................................................................................191
Section 11 Secondary system supervision................................................................193
11.1 Current circuit supervision CCSSPVC ............................................................................. 193
11.1.1 Identification.................................................................................................................... 193
11.1.2 Application.......................................................................................................................193
11.1.3 Setting guidelines............................................................................................................193
11.2 Fuse failure supervision FRWSPVC................................................................................. 194
11.2.1 Identification.................................................................................................................... 194
11.2.2 Application.......................................................................................................................194
11.2.3 Setting guidelines............................................................................................................194
11.2.3.1
11.2.3.2
Railway application RER670
Application manual
Disconnected equipment detection............................................................................ 184
Power supply quality ................................................................................................. 184
Voltage instability mitigation....................................................................................... 184
Backup protection for power system faults................................................................ 184
Settings for two step undervoltage protection............................................................ 184
Equipment protection, transformers........................................................................... 187
Power supply quality.................................................................................................. 187
The following settings can be done for the two step overvoltage protection..............187
High impedance earthed systems .............................................................................189
Solidly earthed systems ............................................................................................ 189
Settings for two step residual overvoltage protection.................................................189
DeltaU and DeltaI detection....................................................................................... 195
Dead line detection.................................................................................................... 195
© 2017 - 2023 Hitachi Energy. All rights reserved
Table of contents
5