Application Notes
P44x/EN AP/E33
MiCOM P441/P442 & P444
Page 111/220
FIGURE 67 - VT SUPERVISION: VTS SETTINGS IN MiCOM S1
•
VTS Timer: A settable alarm from 1 to 20s by step of 1s gives the possibility to signal
by an alarm the Failure. This alarm is instantaneous in case of opto energized by
external INP FFU signal (issued from contact of MCB). During no load, the timer
covers the duration of Dead time1 HSAR cycle (Vo&/IO in case of no load) which
could be detected as VT failure 1 pole.
•
INP_FFUS Line :The external information given by the MCB to the opto input is
secure and will block instantaneously the distance function and the functions which
are use directional element.
FIGURE 68 - DEFAULT PSL EXTRACTED
Where a miniature circuit breaker (MCB) is used to protect the voltage transformer ac output
circuits, it is common to use MCB auxiliary contacts to indicate a three phase output
disconnection. As previously described, it is possible for the VTS logic to operate correctly
without this input. However, this facility has been provided for compatibility with various
utilities current practices. Energising an opto-isolated input assigned to “MCB Open” on the
relay will therefore provide the necessary block.
Fuse failure conditions are confirmed instantaneously if the opto input "INP_FFus line" is
energised and assigned in PSL, or after elapse of the VTS Time delay in case of 1, 2 or 3
phases Fuse Failure.
The confirmed Fuse Failure blocks all protection functions which use the voltage
measurement (Distance, Weak infeed, Directional overcurrent,…). The directional
overcurrent element may be blocked or set to become non directional with dedicated timer
(Time VTS in MiCOM S1)- I>1 or IN>1.
A non confirmed Fuse Failure will be a detection of an internal fuse failure before the timer is
issued. In that case a fault can be detected by the I2>,I0>,I1>,
∆
I> criteria and will force the
unblocking functions:
Distance Protection
DEF Protection
Weak-infeed Protection
I> Directional
U>, U<
Содержание MiCOM P441
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Страница 610: ...Courier Data Base P44x EN GC E44 MiCOM P441 P442 P444 DEFAULT PROGRAMMABLE SCHEME LOGIC PSL...
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