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Topic Title: USING TWO INTERFACING RELAYS AT DIFFERENT POWER SUPPLY VOLTAGES
Topic Summary: TRANSLAY MBCI RELAYS
Created On: 25 January 2012 12:21 PM
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 25 January 2012 12:21 PM
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ACDube

Posts: 5
Joined: 20 January 2010

A contractor has installed a translay feeder unit protection relay using MBCI02 relays for a 33kV feeder. One relay is a powerred of a 50V supply, while the other one is powered at 110V. Though we had commissioning problems like matching the settings and sourcing the 110V we got it to work.
In the long term what is the risk of keeping this arrangement? and are there any protection standards you may point me to?
 28 January 2012 02:42 PM
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ArthurHall

Posts: 736
Joined: 25 July 2008

If you are just talking about the power supply for the relay it shouldent matter as long as the relay is ratted for that voltage.
The trip voltage is not important.
The protection part is powered by the CT's
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