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Recent questions tagged relay

1 answer 43 views

The purpose of the restraining coil in a biased differential relay is  (A) To reduce CT saturation during fault.  (B) To increase the sensitivity of the relay.  (C) To match the transformation ratio.  (D) To limit the spill current through the relay during heavy external fault.

asked May 8, 2018 in Switchgear And Protection by Shimroz123
1 answer 53 views

A relay used for protection of motors against overload is :  (A) Impedance relay (B) Electromagnetic attraction type (C) Thermal relay (D) Buchholz's relay

asked May 8, 2018 in Switchgear And Protection by Shimroz123
1 answer 31 views

A relay has a rating of 5 A, 2.2 sec IDMT and a relay setting of 125% TMS = 0.6. It is connected to a supply circuit through a C.T. 400/5 ratio. The fault current is 4000 A. The operating current of the relay is

asked May 3, 2018 in Switchgear And Protection by Shimroz123
1 answer 28 views

The operating time of instantaneous relay is

asked May 3, 2018 in Switchgear And Protection by Shimroz123
1 answer 73 views

What is the difference between relay and contactor?

asked May 2, 2018 in Switchgear And Protection by Quiz
1 answer 366 views

A negative sequence relay is used for protection of  (1) Generator (3) Motor (2) Transformer (4) Long Transmission lines

asked May 1, 2018 in Switchgear And Protection by Shimroz123
1 answer 20 views

Buchholz relay is  (1) located in the conservator tank  (2) located in the transformer tank itself  (3) connected in the pipe connecting main tank of transformer and conservator  (4) installed in the circuit breaker

asked Apr 30, 2018 in Switchgear And Protection by Shimroz123
1 answer 40 views

To prevent mal-operation of differentially connected relay while energizing a transformer, the relay restraining coil is based with  (1) second harmonic current  (2) third harmonic current  (3) fifth harmonic current  (4) seventh harmonic current

asked Apr 29, 2018 in Switchgear And Protection by Shimroz123
1 answer 26 views

Reactance relay is normally preferred for protection against

asked Apr 29, 2018 in Switchgear And Protection by Shimroz123
1 answer 24 views

Buchholz relay is used as a safety device with respect to which of the following? A) Audio transformers B) Oil filled power transformers C) Air core transformer D) None of these

asked Apr 29, 2018 in Electrical Engineering by Shimroz123
1 answer 22 views

In the induction type directional over current relay, when a short-circuit occurs in the circuit (A) power flows in reverse direction (B) power flows in normal direction (C) directional power element does not operate (D) over current element is not energized

asked Apr 28, 2018 in Switchgear And Protection by Shimroz123
1 answer 13 views

A solid state relay (A) withstands voltage transients (B) does not require auxiliary dc supply (C) provide low burden on CT and P (D) does not provide earth fault protection

asked Apr 28, 2018 in Switchgear And Protection by Shimroz123
1 answer 23 views

A reactance relay is (A) Voltage restrained directional relay (B) Directional restrained over-current relay (C) Voltage restrained over current relay (D) Directional restrained over voltage relay

asked Apr 28, 2018 in Power system by Shimroz123
1 answer 17 views
1 answer 59 views

How do relay works ?

asked Dec 30, 2017 in Switchgear And Protection by Quiz
1 answer 48 views

What is the use of Buchholz relay in transformer?

asked Dec 17, 2017 in Switchgear And Protection by Quiz
1 answer 45 views

What is the difference between a switch and a relay?

asked Dec 17, 2017 in Switchgear And Protection by Quiz
1 answer 19 views

what is reverse power relay?

asked Dec 4, 2017 in Electrical Engineering by Quiz
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