Transformer application example......................................... 129Thermal overload protection, two time constants TRPTTR ...........133Identification.............................................................................. 133Application................................................................................. 133Setting guideline........................................................................ 134Breaker failure protection CCRBRF............................................... 136Identification.............................................................................. 136Application................................................................................. 137Setting guidelines...................................................................... 137Pole discordance protection CCPDSC........................................... 140Identification.............................................................................. 141Application................................................................................. 141Setting guidelines...................................................................... 141Section 8 Voltage protection........................................................ 143Two step undervoltage protection UV2PTUV ................................143Identification.............................................................................. 143Application................................................................................. 143Setting guidelines...................................................................... 144Equipment protection, such as for motors and generators...144Disconnected equipment detection...................................... 144Power supply quality ........................................................... 144Voltage instability mitigation................................................. 144Backup protection for power system faults...........................144Settings for two step undervoltage protection...................... 145Two step overvoltage protection OV2PTOV ..................................146Identification.............................................................................. 146Application................................................................................. 147Setting guidelines...................................................................... 147Equipment protection, such as for motors, generators,reactors and transformers.................................................... 148Equipment protection, capacitors......................................... 148Power supply quality............................................................ 148High impedance earthed systems........................................ 148The following settings can be done for the two stepovervoltage protection.......................................................... 148Two step residual overvoltage protection ROV2PTOV ................. 151Identification.............................................................................. 151Application................................................................................. 151Setting guidelines...................................................................... 151Equipment protection, such as for motors, generators,reactors and transformersEquipment protection fortransformers......................................................................... 152Equipment protection, capacitors......................................... 152Table of contents4 Transformer protection RET650 2.2 IECApplication manual
