Siemens Argus 7SR21 Technical Manual page 317

2.20.2 Operate and Reset Level (59NDT) ......................................................................... 49
2.20.3 Operate and Reset Time (59NDT) .......................................................................... 49
2.20.4 Reference (59NIT) ................................................................................................. 49
2.20.5 Operate and Reset Level (59NIT)........................................................................... 50
2.20.6 Operate and Reset Time (59NIT) ........................................................................... 50
2.21 64H Restricted Earth Fault Protection ................................................................................. 51
2.21.1 Reference .............................................................................................................. 51
2.21.2 Operate and Reset Level ....................................................................................... 51
2.21.3 Operate and Reset Time ........................................................................................ 51
2.22 67/67N Directional Overcurrent & Earth Fault ..................................................................... 52
2.22.1 Reference .............................................................................................................. 52
2.22.2 Operate Angle ....................................................................................................... 52
2.22.3 Operate Threshold ................................................................................................. 52
2.22.4 Operate and Reset Time ........................................................................................ 52
2.23 Directional SEF Wattmetric................................................................................................. 53
2.23.1 Reference .............................................................................................................. 53
2.23.2 Operate and Reset Level ....................................................................................... 53
2.23.3 Operate and Reset Time ........................................................................................ 53
2.24 81 Under/Over Frequency .................................................................................................. 54
2.24.1 Reference .............................................................................................................. 54
2.24.2 Operate and Reset Level ....................................................................................... 54
2.24.3 Operate and Reset Time ........................................................................................ 54
2.25 50 AFD ARC Flash Detector ............................................................................................... 55
(Refer to 7XG31 Technical Manual for performance characteristics) .......................................... 55
2.25.1 Reference .............................................................................................................. 55
2.25.2 Operate and Reset Level ....................................................................................... 55
2.25.3 Operate and Reset Time ........................................................................................ 55
Section 3: Supervision Functions .................................................................................................. 56
3.1 46BC & 46BC U/C Broken Conductor ................................................................................. 56
3.1.1 Reference .............................................................................................................. 56
3.1.2 Operate and Reset Level ....................................................................................... 56
3.1.3 Operate and Reset Time ........................................................................................ 56
3.2 50BF & 50BF-I4 Circuit Breaker Fail ................................................................................... 57
3.2.1 Reference .............................................................................................................. 57
3.2.2 Operate and Reset Level ....................................................................................... 57
3.2.3 Operate and Reset Time ........................................................................................ 57
3.3 60CTS & CTS-I Current Transformer Supervision............................................................... 58
3.3.1 Reference .............................................................................................................. 58
3.3.2 Current & Voltage Threshold .................................................................................. 58
3.3.3 Operate and Reset Time ........................................................................................ 58
3.4 60VTS Voltage Transformer Supervision ............................................................................ 59
3.4.1 Reference .............................................................................................................. 59
3.4.2 Operate and Reset Level ....................................................................................... 59
3.4.3 Operate and Reset Time ........................................................................................ 60
3.5 74TCS Trip Circuit Supervision........................................................................................... 61
3.5.1 Reference .............................................................................................................. 61
3.5.2 Operate and Reset Time ........................................................................................ 61
3.6 81HBL2 Inrush Detector ..................................................................................................... 62
3.6.1 Reference .............................................................................................................. 62
3.6.2 Operate and Reset Level ....................................................................................... 62
3.6.3 Operate and Reset Time ........................................................................................ 62
3.7 81HBL5 Over Fluxing Detector ........................................................................................... 63
3.7.1 Reference .............................................................................................................. 63
3.7.2 Operate and Reset Level ....................................................................................... 63
3.7.3 Operate and Reset Time ........................................................................................ 63
3.8 Load Blinder (21LB - 3P) ................................................................................................... 64
3.8.1 Reference .............................................................................................................. 64
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7SR21 & 7SR22 Performance Specification
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