ABB Relion 670 series - Page 1059

16.4.7.1 Circuit breaker contact travel time
GUID-3AF0EE8D-AA8E-4F83-9916-61B5D0D6B05B v11
The circuit breaker contact travel time subfunction calculates the breaker contact travel time for
opening and closing operations. The operation of the breaker contact travel time measurement is
described in Figure 545.
Contact travel
time
calculation
POSCLOSE
POSOPEN
RSTTRVT
Alarm limit
check
BLOCK
BLKALM
TTRVOP
TTRVCL
TRVTOPAL
TRVTCLAL
IEC12000615-2-en.vsd
IEC12000615 V2 EN-US
Figure 545: Functional module diagram for circuit breaker contact travel time
Contact travel time calculation
The contact travel time of the breaker is calculated from the time between the state of change of
auxiliary contacts. The opening travel time is measured between the opening of the POSCLOSE and
closing of the POSOPEN auxiliary contacts. Similarly, the closing travel time is measured between
the opening of the POSOPEN and closing of the POSCLOSE auxiliary contacts. A compensation
factor has been added to consider the time difference between auxiliary contact operation and
the actual physical opening of the breaker main contact.
tOpent1 t2 t3 tClose t4
Main Contact
POSCLOSE
POSOPEN
0
1
0
1
1
0
tTravelOpen = tOpen + t1 + t2 tTravelClose = tClose + t3 + t4
IEC12000616_1_en.vsd
IEC12000616 V1 EN-US
Figure 546: Travel time calculation
There is a time difference t1 between the pickup of the main contact opening and the opening of
the POSCLOSE auxiliary contact. Similarly, there is a time difference t2 between the time when the
POSOPEN auxiliary contact opens and the main contact is completely open. Therefore, a correction
factor needs to be added to get the actual opening time. This factor is added with the
OpenTimeCorr (t1+t2) setting. The closing time is calculated by adding the value set with the
CloseTimeCorr (t3+t4) setting to the measured closing time.
The last measured opening travel time (TTRVOP) and the closing travel time (TTRVCL) are given as
service values.
1MRK 502 066-UUS B Section 16
Monitoring
1053
Technical manual