Electrical protection systems
all those deviaces and components needed to detect and isolate a faulted system element including instrument transformer but excluding the power switch gear
- protection relay
that electronic or electro-mechanical devices that decides if ther is a fault and then initiates action to clear that fault
- power system zone
a system element or group of elements protected by a particular protection system as defined by the location of the isolating device, usually circuit breaker
- unit protection
a protection system that has a closed prtection zone
that is, CTs defined the exact boundaries of the protection zone
A differential protection is an example of this type of protection
An overcurrent protection or a distance protection is an example of this type of protection
- protection zone
- that portion of the power system or system element protectedby a particular protection system as defined by the location of sensing devices, usually CTs- power system zone
a system element or group of elements protected by a particular protection system as defined by the location of the isolating device, usually circuit breaker
- unit protection
a protection system that has a closed prtection zone
that is, CTs defined the exact boundaries of the protection zone
A differential protection is an example of this type of protection
- non unit protection
a protection system that has defined boundary at the measuring location but the remote boundary depends on the setting of the measuring device, the protection relayAn overcurrent protection or a distance protection is an example of this type of protection
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