P44x/EN AP/E33
Application Notes
Page 116/220
MiCOM P441/P442 & P444
Menu text
Default setting
Setting range
step size
Min
max
GROUP 1
SUPERVISION
CT SUPERVISION
CTS Status
Disabled
Enabled/Disabled
N/A
CTS VN< Inhibit
1
0.5 / 2V
22 / 88V
0.5 / 2V
CTS IN> Set
0.1
0.08 x In
4 x In
0.01 x In
CTS Time Delay
5
0s
10s
1s
4.3.2
Setting the CT Supervision Element
Ir>
Vr<
P0554ENa
&
Temporisation
0<->10sec
Calulation Part
Logical Part
The residual voltage setting, CTS VN< Inhibit and the residual current setting, CTS IN> set,
should be set to avoid unwanted operation during healthy system conditions. For example
CTS VN< Inhibit should be set to 120% of the maximum steady state residual voltage. The
CTS IN> set will typically be set below minimum load current. The time-delayed alarm,
CTS Time Delay, is generally set to 5 seconds.
Where the magnitude of residual voltage during an earth fault is unpredictable, the element
be disabled to prevent a protection elements being blocked during fault conditions.
4.3.2.1
Inputs/outputs in CTS logic:
CT Fail Alarm
The DDB cell indicates a CT Fail detected after timer is issued
4.4 Check
synchronisation
The check synchronism option is used to qualify reclosure of the circuit breaker so that it can
only occur when the network conditions on the busbar and line side of the open circuit
breaker are acceptable. If a circuit breaker were closed when the two system voltages were
out of synchronism with one another, i.e. a difference in voltage magnitudes or phase angles
existed, the system would be subjected to an unacceptable ‘shock’, resulting in loss of
stability and possible damage to connected machines.
Check synchronising therefore involves monitoring the voltage on both sides of a circuit
breaker and, if both sides are ‘live’, the relative synchronism between the two supplies. Such
checking may be required to be applied for both automatic and manual reclosing of the
circuit breaker and the system conditions which are acceptable may be different in each
case. For this reason, separate check synchronism settings are included within the relay for
both manual and automatic reclosure of the circuit breaker. With manual closure, the CB
close signal is applied into the logic as a pulse to ensure that an operator cannot simply keep
the close signal applied and wait for the system to come into synchronism. This is often
referred to as guard logic and requires the close signal to be released and then re-applied if
the closure is unsuccessful.
Содержание MiCOM P441
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Страница 439: ...Commissioning P44x EN CM E33 MiCOM P441 P442 P444 COMMISSIONING...
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Страница 521: ...Courrier Data Base P44x EN GC E44 MiCOM P441 P442 P444 CONFIGURATION MAPPING...
Страница 610: ...Courier Data Base P44x EN GC E44 MiCOM P441 P442 P444 DEFAULT PROGRAMMABLE SCHEME LOGIC PSL...
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