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Technical description
Table of Contents
VM265.EN011
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39
Table of Contents
Introduction .......................................................................... 42
Main features ................................................................... 43
Principles of numerical protection techniques .......... 44
Protection functions ............................................................. 46
Maximum number of protection stages in one
application ................................................................................ 46
List of protection functions ............................................. 46
General features of protection stages ........................ 47
Differential overcurrent protection ΔI> (87) ................ 51
Overcurrent protection I> (50/51) ................................ 56
Current unbalance protection I
> (50N/51N) ............................. 63
Thermal overload protection T> (49) ........................... 68
>(51F2) ...................... 72
Circuit-breaker failure protection CBFP (50BF) ........... 73
Arc fault protection (50ARC/50NARC) (optional) ..... 75
Programmable stages (99) ............................................ 79
Inverse time operation ................................................... 81
Standard inverse delays IEC, IEEE, IEEE2, RI ........ 84
Free parametrisation using IEC, IEEE and IEEE2
equations ............................................................................. 94
Programmable inverse time curves ..................... 95
Supporting functions ............................................................ 96
Event log ........................................................................... 96
Disturbance recorder ..................................................... 98
Current transformer supervision .................................. 103
Circuit breaker condition monitoring ......................... 104
System clock and synchronization ............................. 109
Running hour counter ................................................... 112
Timers ............................................................................... 113
Combined overcurrent status ..................................... 115
Self-supervision ............................................................... 117
Measurement functions ..................................................... 118
Measurement accuracy .............................................. 119
Harmonics and Total Harmonic Distortion (THD) ...... 120
RMS values ..................................................................... 120
Demand values ............................................................. 121
Minimum and maximum values.................................. 121
Maximum values of the last 31 days and twelve
months ..................................................................................... 122
Primary, secondary and per unit scaling................... 123
Current scaling ...................................................... 123
Control functions ................................................................ 126
Output relays ................................................................. 126
Digital inputs ................................................................... 127
Summary of Contents for 265
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