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 defense which isolates the faulty section of the system in case the main protection fails to function properly.
What is the role of backup protection?
5], backup protection is intended to operate when a power system fault is not cleared or an abnormal condition is not detected in the required time because of failure or inability of other protection to operate or failure of the appropriate circuit-breaker(s) to trip.
What is the purpose of back up protection Mcq?
Backup protection is provided so as to: Increase sensitivity. Increase speed of protection system. To act in case of failure of primary protection.
What are the types of backup protection?
Types of Secondary or backup protection
- Relay Backup Protection.
- Breaker Backup Protection.
- Remote Backup Protection.
- Centrally Co-ordinate Backup Protection.
What is the purpose of backup protection answer to increase the speed of B to increase the exit C to leave no blind spot D to guard against failure of primary?
Correct answer is option ‘D’.
What is local backup protection?
The main function of local backup is to address a single local Protection System failure or failure of a circuit breaker to interrupt current. The redundancy provided by local backup inherently addresses single Protection System failures while minimizing the impact to the system.
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 do we need a protection scheme for power system?
The objective of a protection scheme is to keep the power system stable by isolating only the components that are under fault, whilst leaving as much of the network as possible still in operation. The devices that are used to protect the power systems from faults are called protection devices.
What is feeder protection?
Feeder protection, or more exactly protection for overhead lines and cables, is the most commonly used type of protection. The protection has to ensure that the power grid continues to supply energy. In case of a fault, it must be prevented from spreading to healthy parts of the network.
Which type of backup protection is widely used for protection of transmission line?
Types of Backup Protection:
Relays backup protection: Single circuit breaker is used to for both primary and backup relays. Breaker Backup protection: Separate circuit breakers is used for both protections in the same station.
What is primary protection 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.
What are the essential qualities of protection?
Essential Qualities of Protection Systems:
- Fastness of operation.
What are the essential qualities of protective relaying?
What are the Essential Qualities of Protective Relay?
- Speed and Time.
- Selectivity and discrimination.
Which of thermal protection switch is provided in power line system to protect against?
Over load. Under voltage.
What is the most important stator winding fault of an alternator?
Stator winding fault. It is the most severe fault and considered most important for alternator protection. This vital protection of alternator stator is Differential circulating current scheme or Mertz price differential current protection scheme of alternator is discussed in a separate post.
Which relay is used for feeders?
The translay relay is a differential relay. The arrangement is similar to overcurrent relay, but the secondary winding is not closed on itself. These types of relays are used in the feeder protection and the scheme is called the Translay scheme.