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DEIF LMR-122D Loss of mains relay

From:DEIF | author:Mr.Chen | Time :2026-06-22 | 3 view: | 🔊 Click to read aloud ❚❚ ▶ | Share:

DEIF's loss of mains relays protect generators against damage

resulting from a non-synchronised reconnection  to the grid

after a temporary mains failure.

A mains failure will be  detected, provided a disconnection at

an arbitrary point of the network results in a swift  change of

the generator frequency (vector shift). An  opening signal is

then transmitted to  the mains circuit breaker, and the generator

will thus be protected against  damages caused by an automatic

reconnection to the high-voltage network.

Variants

LMR-111D

• Vector shift

LMR-122D

• Vector shift and df/dt (ROCOF)

Features

• Vector shift and df/dt (ROCOF)

• Detection of vector shift

• ANSI code 78

• Mains disconnection on mains failure

• Ensures no asynchronous reconnection

• LED indication of fault condition

• LED indication for activated relay

• 35 mm DIN rail or base mounting

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