VAMP 265 - Table of Contents

Technical description
Table of Contents
VM265.EN011
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39
Table of Contents
1. Introduction .......................................................................... 42
1.1. Main features ................................................................... 43
1.2. Principles of numerical protection techniques .......... 44
2. Protection functions ............................................................. 46
2.1. Maximum number of protection stages in one
application ................................................................................ 46
2.2. List of protection functions ............................................. 46
2.3. General features of protection stages ........................ 47
2.4. Differential overcurrent protection ΔI> (87) ................ 51
2.5. Overcurrent protection I> (50/51) ................................ 56
2.6. Current unbalance protection I
2
>, I’
2
> (46) ................ 60
2.7. Earth fault protection I
0
> (50N/51N) ............................. 63
2.8. Thermal overload protection T> (49) ........................... 68
2.9. Second harmonic O/C stage I
f2
>(51F2) ...................... 72
2.10. Circuit-breaker failure protection CBFP (50BF) ........... 73
2.11. Arc fault protection (50ARC/50NARC) (optional) ..... 75
2.12. Programmable stages (99) ............................................ 79
2.13. Inverse time operation ................................................... 81
2.13.1. Standard inverse delays IEC, IEEE, IEEE2, RI ........ 84
2.13.2. Free parametrisation using IEC, IEEE and IEEE2
equations ............................................................................. 94
2.13.3. Programmable inverse time curves ..................... 95
3. Supporting functions ............................................................ 96
3.1. Event log ........................................................................... 96
3.2. Disturbance recorder ..................................................... 98
3.3. Current transformer supervision .................................. 103
3.4. Circuit breaker condition monitoring ......................... 104
3.5. System clock and synchronization ............................. 109
3.6. Running hour counter ................................................... 112
3.7. Timers ............................................................................... 113
3.8. Combined overcurrent status ..................................... 115
3.9. Self-supervision ............................................................... 117
4. Measurement functions ..................................................... 118
4.1. Measurement accuracy .............................................. 119
4.2. Harmonics and Total Harmonic Distortion (THD) ...... 120
4.3. RMS values ..................................................................... 120
4.4. Demand values ............................................................. 121
4.5. Minimum and maximum values.................................. 121
4.6. Maximum values of the last 31 days and twelve
months ..................................................................................... 122
4.7. Primary, secondary and per unit scaling................... 123
4.7.1. Current scaling ...................................................... 123
5. Control functions ................................................................ 126
5.1. Output relays ................................................................. 126
5.2. Digital inputs ................................................................... 127