The first protective relays were electromagnetic devices, relying on coils operating on moving parts to provide detection of abnormal operating conditions such as over-current, over-voltage, reverse power flow, over-frequency, and under-frequency.
32.
For more than a decade, North American electric utilities have ranked SEL as the # 1 relay manufacturer in the Newton-Evans Worldwide Study of the Protective Relay Marketplace in Electric Utilities.
33.
For large transmission transformers the greatest threat comes from damage to protective relays and other protective devices for E1 pulses ( the shortest duration and most relevant to this question ).
34.
On 13 March 1989, a severe geomagnetic storm caused the collapse of the Hydro-Qu�bec power grid in a matter of seconds as equipment protective relays tripped in a cascading sequence of events.
35.
The device has at least four terminals : a terminal for connection to the high voltage signal, a ground terminal, and two secondary terminals which connect to the instrumentation or protective relay.
36.
The need to act quickly to protect circuits and equipment as well as the general public often requires protective relays to respond and trip a breaker within a few thousandths of a second.
37.
Frequency protective relays on the power system network sense the decline of frequency and automatically initiate load shedding or tripping of interconnection lines, to preserve the operation of at least part of the network.
38.
Some manufacturers of medium-voltage distribution fuses combine the overcurrent protection characteristics of the fusible element with the flexibility of relay protection by adding a pyrotechnic device to the fuse operated by external protective relays.
39.
While operating at reduced power in anticipation of typhoon Talim, on " " ", the Unit 2 main transformer differential protective relay tripped because a damaged support insulator caused one phase to flash to ground.
40.
One physical device may correspond to one function number, for example " 29 Isolating Switch ", or a single physical device may have many function numbers associated with it, such as a numerical protective relay.
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