1: Reliability
Reliability, in system protection parlance, has special definitions which differ from the usual planning or
operating usage. A relay can misoperate in two ways: it can fail to operate when it is required to do so, or
it can operate when it is not required or desirable for it to do so. To cover both situations, there are two
components in defining reliability:
Dependability—which refers to the certainty that a relay will respond correctly for all faults for which
it is designed and applied to operate; and
Security—which is the measure that a relay will not operate incorrectly for any fault.
Most relays and relay schemes are designed to be dependable since the system itself is robust enough
to withstand an incorrect tripout (loss of security), whereas a failure to trip (loss of dependability) may
be catastrophic in terms of system performance.
Reliability, in system protection parlance, has special definitions which differ from the usual planning or
operating usage. A relay can misoperate in two ways: it can fail to operate when it is required to do so, or
it can operate when it is not required or desirable for it to do so. To cover both situations, there are two
components in defining reliability:
Dependability—which refers to the certainty that a relay will respond correctly for all faults for which
it is designed and applied to operate; and
Security—which is the measure that a relay will not operate incorrectly for any fault.
Most relays and relay schemes are designed to be dependable since the system itself is robust enough
to withstand an incorrect tripout (loss of security), whereas a failure to trip (loss of dependability) may
be catastrophic in terms of system performance.
ليست هناك تعليقات:
إرسال تعليق