INTR_EF
outputs can be used for monitoring purposes. The operation of the Transient
detector is illustrated in
Several factors affect the magnitude and frequency of fault transients,
such as the fault inception angle on the voltage wave, fault location, fault
resistance and the parameters of the feeders and the supplying
transformers. If the fault is permanent (non-transient) in nature, the initial
fault transient in current and voltage can be measured, whereas the
intermittent fault creates repetitive transients. The practical sensitivity of
transient detection is limited to approximately few hundreds of ohms of
fault resistance. Therefore the application of transient detection is limited
to low ohmic ground faults.
GFC
release
INTR_EF
PEAK_IND
Reset timer
Reset delay time
IG
VG
Reset delay time
GUID-A5B0DD30-710A-4E95-82F8-1D2692452239 V2 EN
Figure 215:
Example of operation of Transient detector: indication of detected
transient by
PEAK_IND
output and detection of restriking or intermittent
ground fault by
INTR_EF
output (setting Peak counter limit = 3)
1MAC059074-MB A
Section 4
Protection functions
615 series ANSI
449
Technical Manual
Summary of Contents for Relion 615 series
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