http://www.svri.nl/en/protection-relays-then-and-now/

13 December 2019

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Protection relays then and now

In the past, manufacturers assembled generator protection systems from electro-mechanical and later electronic relays. Each relay contained only one or some dedicated protective functions.

Voltage regulators then and now

Initially, an automatic voltage regulator (AVR) for generators was an electro-mechanical device with a variable resistance as an output. Generators with a dc exciter were often provided with the Brown Boveri (BBC) Universal Voltage Regulator.

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