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A reverse current relay senses Power in (uses both voltage and current, and looks at the phase angle between these), and operates if power is flowing in the reverse direction, and the current is above a set point. An overcurrent relay looks at only current, and operates if it is above a set point regardless of power flow direction. Reverse current relays are often referred to as reverse power relays.
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Rafait is the short circuit condition.it is provided by using circuit breakers and relays.
AnswerAn overcurrent is either an overload current or a short-circuit current. Overload currents occur when the load draws more current than the circuit is designed to handle on a continuous basis. Short-circuits occur when the line and neutral or the line and earth (ground) conductors make accidental contact. Overcurrent protection is provided by using either a fuse or a circuit breaker.
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Difference between overcurrent relay and fuse?
Current is flow of electricity charge. Voltage is a measure of potential energy or charge. Fuse. Is a device that opens when the current rating is exceeded this stopping the flow of current.
What are electrical fuses?
Safety devices used in electrical circuits.AnswerA fuse is an overcurrent protection device, and will operate in the event of a sustained overload current or a short-circuit current.
Why Normal time-overcurrent relays are not adequate for generator backup protection?
Setting the time-overcurrent relays high enough to prevent tripping for normal overloads may result in them not tripping at all due to the decaying characteristic of the generator fault current. Using the system voltage to control the overcurrent characteristic resolves this problem, since the voltage should drop very little for overloads, but will collapse to a small value for external faults. The 51V protection function uses the system voltage to adapt the operation of a time overcurrent element, using either voltage-restraint (51VR) or voltage-control (51VC).
What is the difference between over current and overload condition?
The term, 'overcurrent', describes either an 'overload current' or a 'short-circuit current'.An 'overload current' is a current that is higher than a circuit's 'rated current'. For example, if you have too many loads plugged into the same circuit, then the resulting current is an 'overload current'.A 'short-circuit current' is a large current resulting when a line ('hot') conductor accidentally makes contact with either a neutral conductor or an earth (ground) conductor.
What is produced first current or voltage?
current flows as a result of potential difference i.e. in a circuit if there is no voltage difference between two points, no current can flow between those two points. So voltage has to be produced first.
