Introduction to power system protection pdf

What is a power protection scheme?

Protection schemes are specialized control systems that monitor the power system, detecting faults or abnormal conditions and then initiate correct action. In this course the power system is considered as all the plant and equipment necessary to generate, transmit, distribute and utilize the electric power.

How do you protect a power system if a fault occurs?

To limit the extent of the power system that is disconnected when a fault occurs, protection is arranged in zones. The principle is shown in Figure A1.5. Ideally, the zones of protection should overlap, so that no part of the power system is left unprotected. This is shown in Figure A1.6(a), the circuit breaker being included in both zones.

Why is protection important in power system design?

The provision of adequate protection to detect and disconnect elements of the power system in the event of fault is therefore an integral part of power system design. Only by so doing can the objectives of the power system be met and the investment protected.

Why do we need a protection system?

As the protected components of the electrical systems have changed in size, configuration and their critical roles in the power system supply, some protection aspects need to be revisited (i.e. the use of protection systems to reduce arc flash energy in distribution systems).

Does a power system need protection?

art of the power system remains withoutprotection. However, occurr e of different circuit breakers so that the me ensures fast and selective clearing of any faultwithin the boundaries of the ci cuit element, that the zone is required to protect.Primary Protection as a rule is prov ded for each section of an electrical ins

What are the requirements of a protection system?

•  The protection system shall not react to non-fault situations •  The protection system must not react to faults in neighboring zones or high load currents. 24! Sensitivity •  Sensitivity refers to the minimal changes in measured parameter that the system can react to.