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| FEATURES:
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| The Logmaster Exciter Failure Relay, LM-EFR, is a new solid
state protection
relay for generator excitation systems. This relay contains two stages
of excitation system monitoring that can be used on all types and sizes
of generators. The Logmaster LM-EFR relay can accept a station power
supply
between 25 and 250 volts AC or DC. This relay is enclosed in a rugged
NEMA
4X fiberglass enclosure that can be mounted to any available flat
surface
in the exciter cubicles. By directly monitoring the field voltage and terminal voltage, the relay uses the simple logic that these two signals should always work in opposite direction. |
That is, when terminal voltage is low, field voltage should be high to attempt to correct the situation, and vice versa. When both signals are low or both are high, something has gone wrong in the excitation system/voltage regulator channel and some action is required immediately. With the two detection stages in the LE-EFR, the first stage can be used to switch to an alternate regulating channel. If the problem is not fixed after an adjustable time delay, the generator must be removed from the grid. This direct method of failure detection is faster and more reliable than an offset mho relay and allows the fast removal of a faulty unit from the grid, thus minimizing the impact of the failure on the power grid. |
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Nominal generator terminal voltage: 100 to 130Vac, 50 or 60 Hz Nominal generator full Ceiling field voltage: Field voltage source: Fully tested for surge withstand and radio interference immunity.
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92 Advance Road, Toronto, Ontario M8Z 2T7 Telephone (416) 231-5535 / 800 551 8393 FAX (416) 231-6184 Click here to Email |
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Stand alone
detection of generator