CYG PRS-7367 - Protection Functions

Table of contents
2 PRS-7367
2.5.2 Mechanical Tests ................................................................................................................ 24
2.5.3 Electrical Tests ................................................................................................................... 25
2.5.4 Electromagnetic Compatibility ........................................................................................... 25
2.6 Terminals ........................................................................................................ 26
2.7 Measurement Range and Accuracy.............................................................. 27
2.8 Protection Function Features ....................................................................... 27
2.8.1 Overcurrent Protection ....................................................................................................... 27
2.8.2 Residual Overcurrent Protection ........................................................................................ 28
2.8.3 Sequence Overcurrent Protection ..................................................................................... 28
2.8.4 Phase Discontinuity Protection .......................................................................................... 28
2.8.5 Over/Under Frequency Protection ..................................................................................... 28
2.8.6 Over/Under Voltage Protection .......................................................................................... 29
2.8.7 Power Protection ................................................................................................................ 29
2.8.8 50BF Protection ................................................................................................................. 29
2.8.9 Thermal overload ............................................................................................................... 29
2.8.10 Auto-Reclose .................................................................................................................... 29
2.8.11 OCR_INR ......................................................................................................................... 29
2.8.12 Sensitive Earth Fault ........................................................................................................ 30
2.8.13 Gap overcurrent and zero sequence overvoltage ........................................................... 30
2.8.14 Restricted Earth Fault Protection 64REF ........................................................................ 30
2.8.15 Differential Protection ....................................................................................................... 30
3 Protection Functions .................................................................... 32
3.1 Overview ......................................................................................................... 32
3.1.1 Glossary ............................................................................................................................. 32
3.1.2 System parameter .............................................................................................................. 34
3.2 Non-directional overcurrent protection 50/51P ........................................... 35
3.2.1 50/51P Overview ................................................................................................................ 35
3.2.2 50/51P Protection Principle................................................................................................ 36
3.2.3 50/51P Application Scope .................................................................................................. 39
3.2.4 50/51P Settings .................................................................................................................. 39