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Protection relays

Keywords
Abstract

The protection relays can be used for line protection of high and medium voltage networks with earthed (grounded), low-resistance grounded, isolated or compensated neutral point.
With regard to motor protection, protection relays are suitable for asynchronous machines of all sizes.
The relay performs all functions of backup protection supplementary to transformer differential protection.

Multifunction protection relays

Multifunction protection relays (SOURCE: Siemens)

Protection functions

Setting ranges

Connection of current and voltage transformers

Overcurrent protection

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