"Protection can be tested by injection from suitable test kit"
I know, I've done it many times but I suspect that there are conditions that cannot be simulated.
I recall testing a large UPS system, 32MW for one building. We had done all the tests, we ended by connecting a 32MW loadbank (that was fun) and threw the main switch. All went well but, of course, in a real power cut our UPS system would be feeding all of the local area as well for the few milliseconds between loss of power and the main breaker opening. That couldn't be tested!
"Protection can be tested by injection from suitable test kit"
I know, I've done it many times but I suspect that there are conditions that cannot be simulated.
I recall testing a large UPS system, 32MW for one building. We had done all the tests, we ended by connecting a 32MW loadbank (that was fun) and threw the main switch. All went well but, of course, in a real power cut our UPS system would be feeding all of the local area as well for the few milliseconds between loss of power and the main breaker opening. That couldn't be tested!
