Quick Answer: What are the essential elements of a protective relay?

Which of the following is an essential element of a relay?

The heart of a relay is an electromagnet (a coil of wire that becomes a temporary magnet when electricity flows through it) These work on the principle of mechanical force causing an operation of the relay.

What are the three basic components of a protective relay scheme?

What are the essential components of a protective relay?

  • Sensing element.
  • Comparison element.
  • Control.

What are the elements of relay?

A simple electromagnetic relay consists of a coil of wire wrapped around a soft iron core (a solenoid), an iron yoke which provides a low reluctance path for magnetic flux, a movable iron armature, and one or more sets of contacts (there are two contacts in the relay pictured).

Which of the following is the essential component of electromagnetic relay?

An electromagnet is an essential components of electromechanical relays.

What is a protective relay state some important features of a good protective relay?

The main features of a good protective relaying are its reliability, sensitivity, simplicity, speed, and economy.

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What are the elements of protection system?

Components of Protection System:

  • Relays.
  • Circuit Breakers.
  • Tripping and Other Auxiliary Supplies.
  • Current Transformer (CT)
  • Voltage Transformers (VT)
  • Linear Coupler.

What is the basic requirements of relays?

Fundamental Requirements of Protective Relay:

Speed. Sensitivity. Reliability. Simplicity.

What are the functions of protective relays?

The function of protective relaying is to cause the prompt removal from service of any element of a power system when it suffers a short circuit, or when it starts to operate in any abnormal manner that might cause damage or otherwise interfere with the effective operation of the rest of the system.

What do you mean by protective relay?

In electrical engineering, a protective relay is a relay device designed to trip a circuit breaker when a fault is detected.

What do protective relay provide Mcq?

ANSWER: b. Close the contacts when the actuating quantity attains a certain predetermined value.

What is the requirement of electromagnetic relay?

Electromagnetic Attraction Relay

In this relay, the armature is attracted to the pole of a magnet. The electromagnetic force exerted on the moving element is proportional to the square of the current flow through the coil. This relay responds to both the alternating and direct current.

What are the two main parts of electromagnetic relay?

Usually, an electromagnetic relay has two circuits – namely low-voltage control circuit and high-voltage working circuit. The low-voltage control circuit has an electromagnetic relay coil, a low-voltage power supply and also a switch.

What are the different type of electromagnetic relay?

Depending upon working principle these can be divided into following types of electromagnetic relays.

  • Attracted Armature type relay,
  • Induction Disc type relay,
  • Induction Cup type relay,
  • Balanced Beam type relay,
  • Moving coil type relay,
  • Polarized Moving Iron type relay.
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