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bejoyengineer

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I am not sure how a Synchronism check relay works? Any good sites with explanations would be of great help….. As the name and description given in manuals, it states that this relay checks the voltage, magnitude, phase angle and frequency between the lines connected to the in and out of a breaker that is ready for a close operation or in other words it checks the voltages between the incoming line (line going to the breaker) and the bus( the part that is going out of the breaker and connected to the bus). But in the actual case –only the incoming line to the breaker will be hot and the outgoing line from the breaker to bus will not be hot and will become hot only if we close the breaker. So in that case – how will it actually compare the voltage, magnitude, phase angle and frequency as we have a live line and a dead bus condition all the time and there by closing the breaker? When and Where does the comparison take place?
 
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