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Technical description
Table of Contents
VM59.EN001
VAMP 24h support phone +358 (0)20 753 3264
37
Table of Contents
Introduction .......................................................................... 40
Main features ................................................................... 40
Principles of numerical protection techniques .......... 41
Protection functions ............................................................. 44
Maximum number of protection stages in one
application ................................................................................ 44
List of protection functions ............................................. 44
General features of protection stages ........................ 45
Relay function dependencies ...................................... 49
Current protection function dependencies ....... 49
Overcurrent protection I> (50/51) ................................ 49
Remote controlled overcurrent scaling .............. 54
> (46) ................................. 55
Directional earth fault protection I
> (50N/51N) ............................. 63
Zero sequence voltage protection U
Thermal overload protection T> (49) ........................... 71
Circuit breaker failure stage CBFP (50BF) .................... 75
Line differential protection LdI> (87L) .......................... 76
Capacitive charging current ................................ 84
ANSI 85 (POC –signals) ........................................... 85
Programmable stages (99) ............................................ 86
Inverse time operation ................................................... 89
Standard inverse delays IEC, IEEE, IEEE2, RI ........ 91
Free parameterization using IEC, IEEE and IEEE2
equations ........................................................................... 102
Programmable inverse time curves ................... 103
Supporting functions .......................................................... 104
Event log ......................................................................... 104
Disturbance recorder ................................................... 106
Cold load pick-up and inrush current detection ..... 110
Current transformer supervision .................................. 113
Circuit breaker condition monitoring ......................... 114
System clock and synchronization ............................. 119
Running hour counter ................................................... 123
Timers ............................................................................... 124
Combined overcurrent status ..................................... 126
Self-supervision ............................................................... 129
Diagnostics ............................................................ 129
Measurement functions ..................................................... 131
Measurement accuracy .............................................. 131
RMS values ..................................................................... 132
Harmonics and Total Harmonic Distortion (THD) ...... 132
Demand values ............................................................. 133
Minimum and maximum values.................................. 133
Содержание VAMP 59
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