Siemens Argus 7SR21 - Page 516

7SR210 & 7SR220 Commissioning & Maintenance Guide
Page 4 of 82 © 2013 Siemens Protection Devices Limited
2.8 Undercurrent. (37) .............................................................................................................. 44
2.9 Thermal Overload (49) ....................................................................................................... 46
2.10 Over/Under Voltage............................................................................................................ 48
2.10.1 Phase Under/Over Voltage. (27/59) ....................................................................... 48
2.10.2 Undervoltage Guard (27/59UVG) ........................................................................... 50
2.10.3 Vx Under/Over Voltage. (Vx 27/59) ........................................................................ 51
2.10.4 NPS Overvoltage (47) ............................................................................................ 53
2.10.5 Neutral Overvoltage (59N) ..................................................................................... 55
2.10.6 Definite Time (59NDT) ........................................................................................... 55
2.10.7 Inverse Time (59NIT) ............................................................................................. 56
2.10.8 Element Blocking ................................................................................................... 56
2.10.9 Under/Over Frequency (81) ................................................................................... 57
2.11 Power (32) ......................................................................................................................... 59
2.12 Sensitive Power (32S) ........................................................................................................ 61
2.13 Power Factor (55) .............................................................................................................. 63
Section 3: Supervision Functions .................................................................................................. 65
3.1 CB Fail. (50BF) .................................................................................................................. 65
3.2 Voltage Transformer Supervision. (60VTS) ......................................................................... 67
3.2.1 1 or 2 Phase VT fail ............................................................................................... 68
3.2.2 3 Phase VT fail ...................................................................................................... 68
3.3 Current Transformer Supervision. (60CTS) ......................................................................... 69
3.3.1 Element Blocking ................................................................................................... 70
3.4 Broken Conductor. (46BC) ................................................................................................. 71
3.4.1 Element Blocking ................................................................................................... 72
3.5 Load Blinder (21)................................................................................................................ 73
3.5.1 Determining Load Blinder Regions (21LB) .............................................................. 75
3.5.2 Determining Trip Level ........................................................................................... 76
3.6 Trip Circuit Supervision. (74TCS) ....................................................................................... 77
3.7 Magnetising Inrush Detector. (81HBL) ................................................................................ 78
3.1 Over Fluxing Detector. (81HBL5) ........................................................................................ 79
Section 4: Control & Logic Functions ............................................................................................ 80
4.1 Autoreclose (79) ................................................................................................................. 80
4.2 Quick Logic ........................................................................................................................ 80
Section 5: Testing and Maintenance .............................................................................................. 81
5.1 Periodic Tests .................................................................................................................... 81
5.2 Maintenance ...................................................................................................................... 81
5.3 Troubleshooting ................................................................................................................. 82