Application Guide
P12x/EN AP/A96
MiCOM P120/P121/P122/P123
Page 65/80
Figure 19 hereafter shows a CB failure condition. After the t BF timer elapses, the relay
doesn’t detect the opening of the CB pole. Therefore, a CB FAIL signal is given.
I< threshold
I< threshold
t BF timer
Trip order
20 samples
20 samples
20 samples
20 samples 20 samples 20 samples
20 samples 20 samples
20 samples 20 samples
CB failed
« CB FAIL » signal
« CB pole closed » internal signal
P0035ENa
FIGURE 19: CB NOT YET OPEN BEFORE tBF EXPIRED
Figure 20 hereafter shows an other case of normal CB operation. Once the fault is cleared,
the phase current signal takes time to decrease due to the de-magnetisation of the phase
CT. It is a typical case for TPY class CTs which are built with air gap in their magnetic core.
Before the drop off of the t BF timer, the relay has detected an opening of the CB pole, thus
no CB failure signal is given as it is required. A basic Breaker Failure element based on an
simple undercurrent element would detect a false CB failure condition as the current signal
value is outside the I< bandzone at the t BF timer drop off.
NOTE:
Both « CB pole closed » and « CB pole opened » internal signals
mentioned in the above diagrams are derived from the Circuit Breaker
Failure function algorithm. They are not affected by the status of the
relay opto-inputs wired to the 52a and 52b CB auxiliary contacts.
I< threshold
I< threshold
t BF timer
Trip order
20 samples
20 samples
20 samples
20 samples
20 samples
20 samples
20 samples
« CB pole opened »
detection
« CB pole closed » internal signal
20 samples
20 samples
P0036ENa
FIGURE 20: DE-ENERGIZATION OF THE CT PHASE
Содержание MiCom P120
Страница 1: ...MiCOM P120 P121 P122 P123 Overcurrent Relays Version 11 Technical Guide P12X EN T A96...
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