Contents
Current reversal and weak end infeed logic for
distance protection (ZCAL) .............................................................. 60
Current reversal logic.................................................................... 60
Weak end infeed logic .................................................................. 61
Completing the test....................................................................... 62
Current reversal and weak end infeed logic for residual
overcurrent protection (EFCA) ......................................................... 63
Testing the current reversal logic.................................................. 63
Testing the weak-end-infeed logic................................................ 63
Completing the test....................................................................... 65
Definite and inverse time-delayed residual
overcurrent protection (TEF) ............................................................. 66
Checking the operate values of the
current measuring elements ................................................. 66
Event function (EV)............................................................................ 70
Event recorder ................................................................................... 71
Fuse failure supervision (FUSE)........................................................ 72
Checking that the binary inputs and outputs
operate as expected .............................................................. 72
Measuring the operate value for the
negative sequence function .................................................. 73
Measuring the operate value for the zero sequence function....... 74
Checking the operation of the du/dt, di/dt based function ............ 75
Completing the test....................................................................... 76
High speed binary output logic (HSBO)............................................. 77
HSBO- trip from communication logic........................................... 77
HSBO- trip from the high-speed function (HS) ............................. 79
HSBO- trip from the distance protection zone 1 function (ZM1)... 80
Completing the test....................................................................... 81
Instantaneous overcurrent protection (IOC) ...................................... 82
Measuring the operate limit of set values ..................................... 82
Completing the test....................................................................... 83
Monitoring of AC analogue measurements ....................................... 84
Monitoring of DC analogue measurements ....................................... 85
Setting lockout (HMI) ......................................................................... 87
Scheme communication logic for distance protection
functions (ZCOM) ............................................................................ 88
Testing permissive underreach..................................................... 88
Testing permissive overreach....................................................... 89
Testing blocking scheme .............................................................. 89
Checking of unblocking logic........................................................ 90
Completing the test....................................................................... 90
Scheme communication logic for residual
overcurrent protection (EFC) ........................................................... 91
Testing the directional comparison logic function......................... 91
Completing the test....................................................................... 92
Setting group selector (GRP)............................................................. 93
Time delayed overcurrent protection (TOC) ...................................... 94
Measuring the operate limit of set values ..................................... 94
Completing the test....................................................................... 95
Trip logic (TR).................................................................................... 96
3ph operating mode...................................................................... 96
1ph/3ph operating mode............................................................... 96
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