Quick Answer: What is the process of backup protection?

The backup protection provides the back up to the main protection whenever it fails in operation or its cut out for repairs. … The backup protection is the second line of defence which isolates the faulty section of the system in case the main protection fail to function properly.

What are the methods of backup protection?

Methods of back-up protection

  • Relay Back-up : in this method , Different breakers are provided for main and back-up protection, both the breakers being in the same station.
  • Breaker Back-up : In this method, separate breakers are provided for primary and backup protection.

What is main and back up protection?

Primary protection (Main protection) is the essential protection provided for protecting an equivalent/machine or a part of the power system. As a precautionary measure, addition protection is generally provided and is called Backup Protection.

How does protection system work?

Protection systems usually comprise five components: Current and voltage transformers to step down the high voltages and currents of the electrical power system to convenient levels for the relays to deal with. Protective relays to sense the fault and initiate a trip, or disconnection, order.

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What is backup protection relay?

Definition of backup relay

: a secondary relay to protect a power system against faults in the event of failure of the primary relay to function as desired.

Which of the following is backup protection?

The backup protection is the second line of defence which isolates the faulty section of the system in case the main protection fail to function properly. … The backup protection is mainly used where the main protection of the adjacent circuit is unable to backup the main protection of the given circuit.

What is digital protection?

Digital protection is based on the use of computers in power line relaying. … The text covers the mathematical basis of numerical techniques and relay algorithms, the basic elements of digital protection and the fundamentals underlying the commonest algorithmic forms, particularly as applied to line protection.

Why are reactors used?

Reactors are used to limit the short circuit currents which can cause damage to the equipments of the power system. The additional reactance added in series with the system for protection, are called reactors. … They are used to limit the short circuit currents according to the capacity of circuit breakers.

What is Restriking voltage *?

Restriking voltage is the transient voltage appearing across the breaker contacts immediately after the opening of breaker contacts. also called Transient Recovery Voltage.

What are the two types of protection?

It is a usual practice to divide the Types of Protection scheme into two classes viz. primary protection and back-up protection.

What are the elements of protection system?

There are three principal components of a protection system:

  • Transducer.
  • Protective relay.
  • Circuit breaker.
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Why is system protection required?

The main objective of using power system protection is to detach the faulty section from the system to make the rest of the portion work without any disturbance. In addition to this, it is used for the protection of power system and prevent the flow of fault current.

What is primary and backup relay?

Also the backup relays should be coordinated with the primary relays. When fault occurs, both the type of relays starts relaying operation but primary is expected to trip first and backup will then reset without having had time to complete its relaying operation.

What type of backup protection is used for alternators?

Backup protection is provided by distance relays (Device 21) or voltage supervised overcurrent relays (Device 51V). These relays can be connected to CTs at the neutral end of the generator or they can be connected to CTs at the generator terminals.