What is a slash-voltage-rated breaker?
Some circuit breakers have dual voltage ratings stamped on them, such as 240/120V or 480/277V. These breakers are known in…
Some circuit breakers have dual voltage ratings stamped on them, such as 240/120V or 480/277V. These breakers are known in…
Negative sequence overvoltage protection [ANSI 59Q] is used for detecting phase voltage unbalance or reverse phase condition. Variation of individual…
Negative sequence overvoltage protection is used for protection of service main, motor circuits, sensitive loads for conditions such as reverse…
Grounding transformers are used in utility and industrial distribution systems to ‘create a grounded system’ from an otherwise ungrounded source.…
Control circuit for medium and high voltage circuit breakers have protective relay contacts to trip and close circuit breaker. Control…
Series connection of current transformer [CT] is used when accuracy improvement is desired without increasing CT ratio. Series connection of…
Capacitor trip device [CTD] or capacitor trip unit [CTU] is a device that provide DC source of energy for circuit…
A separately derived system is an electrical system in which the service phase (hot) and neutral conductors has no electrical…
Main Bonding Jumper [MBJ] is used to connect switchboard neutral bus and switchboard ground bus. MBJ is a very critical…
Temperature is the most common cause behind power system device damage. Expensive devices such as motors and transformers can have…