What are the types of protection in power system?

Types of protection

• High-voltage transmission network.
• Generator sets.
• Overload and back-up for distance (overcurrent)
• Earth fault/ground fault.
• Distance (impedance relay)
• Back-up.
• Low-voltage networks.
• Cybersecurity.

What is reliability in protection?

Security. Security of protection systems is “That facet of reliability that relates to the degree of certainty that a relay or relay system will not operate incorrectly. 2. ” Security is a concern for. external faults and unfaulted operating conditions.

What does mean by selectivity of power system protection?

What is “selectivity”? Complete selectivity means that the protective devices will minimize effect of a short circuit or other undesirable event on the power system. The amount of the power system that must be shut down in response to the event is kept to the absolute minimum.

What is the difference between primary protection and back-up protection?

The primary protection is the first line of defense and is responsible to protect all the power system elements from all the types of faults. The backup protection comes into play only when the primary protection fails.

What is selectivity of relay?

Selectivity means the ability to determine the point at which the fault occur and select the nearest circuit breaker in the system to trip so that the fault is cleared with minimum or no damage to the system.

How does selectivity increase the security of the protection system?

Security of the relaying system can be improved by improving selectivity of the relaying system. Like sensitivity, selectivity also implies an ability to discriminate. This discriminant is used to inhibit relay operation during inrush, there by, improving selectivity in transformer protection.

What is meant by reliability of a relay?

Reliability means that relay operates only when there is a fault. Unreliable protection system will lead to spurious tripping of circuit breaker. Simplicity – Simplicity increases the reliability. The simpler the system, the greater will be its reliability.

What is a backup protection and why is it required?

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 an example of primary protection?

Primary protection: It is responsible for all system protection. Always the primary protection is having the relay co-coordination of tripping before the backup protection. Example: Restricted Earth Fault, Differential protection etc.

What is system protection?

System Protection is a feature available in all Windows 7 editions that helps protect your system and personal files. It takes snapshots, called Restore Points, of your files. You can then later restore these files if a virus, person, or anything else deletes or damages them.

Why do we need protection in power system?

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.