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A particular type of equipment applied to electric power systems to detect abnormal and intolerable conditions and to initiate appropriate corrective...


= Encyclopedia Article; = Research Update
Figure 1.Zones of protection on simple power system.
From Encyclopedia article 'Electric protective devices'
Figure 2.Simple differential protection scheme. The system compares currents to detect faults in the protection zone. Current transformers reduce the primary current to a small secondary value. (a) Normal operation. (b) With fault.
From Encyclopedia article 'Electric protective devices'
Figure 3.Differential protection. (a) Typical arrangement for electrical equipment. Relays A, B, and C are differential relays. (b) Trip circuit. A = auxiliary out-off breaker; ICS = operation indicator and circuit seal-in auxiliary relay; OP = operating coil; R = restraining coil; WL = auxiliary hand-reset lock-out relay.
From Encyclopedia article 'Electric protective devices'
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