Rev.01
60/151
(2)
The range of the Time Dial setting will depend on the curve. The range of this setting for each curve
family is as follows:
TIME DIAL (TMS)
Description
Minimum Maximum Step Unit Default
Curve (A, B or C)
0.1
300
0.01
-
1.00
The overfluxing protection is used as protection of the generator and connected transformer (e.g.
auxiliary services transformer) against loss of insulation between the laminations of the magnetic circuit
leading to overheating produced by the iron losses due to the induction increase (over-excitation).
The overfluxing condition may occur:
•
With generators disconnected from the network during Start-up or standing, due to automatic
control of the voltage regulator which, at Iow frequency, forces excitation increasing the flux in
order to keep the voltage constant.
•
For failure of the voltage regulator in automatic control or wrong operations on manual control.
•
Following the over-voltage produced by the shedding of a significant load, whilst the voltage
regulator is not operating sufficiently quickly to reduce the overvoltage.
The device measures the Un/fn ratio, which is proportional to the excitation level of the generator or
transformer. The calculation is based on the ratio between the maximum voltage of the three phase-to-
phase voltages and the frequency. The function picks up when the excitation level exceeds the activation
level.
If the option ‘Defined time’ is selected for the curve setting, the unit behaves like an instantaneous
overflux unit. In this case, the unit time delay is adjuste
d by using the parameter ‘Time delay’.
If a curve is selected for the curve setting, the time delay depends on the curve, dial and activation level
settings.
If the unit operates as defined time, the function is activated at 100% of the set tap value, and it
deactivates at 95%.
If the unit operates with a curve, the function is activated at 110% of the set level, and it deactivates at
100%.
The reset
will depend on “Reset Time” setting in both cases.
If the unit operates as defined time, the accuracy of the Time Delay is equal to the set time delay ±30ms
or ±0.5% (whichever is greater).
If a curve is selected for the curve setting, the accuracy of the time delay is equal to the theoretical time
±30ms or ±5% (whichever is greater).
Содержание SIL-G
Страница 1: ...USER S MANUAL USER S MANUAL SIL G Feeder Relay...
Страница 8: ...www fanox com Rev 01 8 151 2 3 Connection diagrams 2 3 1 Analog current connections...
Страница 10: ...www fanox com Rev 01 10 151 3 VT configuration phase neutral...
Страница 11: ...www fanox com Rev 01 11 151 3 VT configuration phase neutral residual voltage...
Страница 12: ...www fanox com Rev 01 12 151 3VT configuration phase phase residual voltage...
Страница 13: ...www fanox com Rev 01 13 151 2VT configuration phase phase residual voltage...
Страница 14: ...www fanox com Rev 01 14 151 3 VT configuration phase neutral phase B line voltage...
Страница 27: ...www fanox com Rev 01 27 151 Dimensions 175x175x150 3 3 Functional diagram...
Страница 28: ...www fanox com Rev 01 28 151...
Страница 46: ...www fanox com Rev 01 46 151 4 10 4 Thermal protection curves This is the thermal curve for 3 minutes...
Страница 69: ...www fanox com Rev 01 69 151 General trip...
Страница 88: ...www fanox com Rev 01 88 151...
Страница 89: ...www fanox com Rev 01 89 151...
Страница 90: ...www fanox com Rev 01 90 151...
Страница 95: ...www fanox com Rev 01 95 151 Time Minutes Seconds Milliseconds...
Страница 150: ...www fanox com Rev 01 150 151 NOTES...
Страница 151: ...www fanox com Rev 01 151 151...
