Application Notes
P44x/EN AP/E33
MiCOM P441/P442 & P444
Page 115/220
4.2.8
INPUT / OUTPUT used in VTS logic:
4.2.8.1
Inputs
MCB/VTS Line
The DDB:MCB/VTS Line if linked to an opto in the PSL and when energized, informs the
P44X about an internal maloperation from the VT used for the impedance measurement
reference. (Line in this case means Main VT ref measurement / even if the main VT is on the
bus side and the Synchro VT is on the line side).
MCB/VTS Bus
The DDB:MCB/VTS Bus if linked to an opto in the PSL and when energized, informs the
P44X about an internal maloperation from the VT used for synchrocheck control (See
CheckSync logic in section 4.4).
4.2.8.2
Outputs
VTS Fast
Set high for internal FFAilure detection made with internal logic.
VTS Fail Alarm
Set high Set highwhen Opto energised (copy of MCB) OR internal FFAilure confirmed at the
end of VTS timer.
Any Pole Dead
The DDB Any Pole Dead if linked in the PSL, indicates that one or more poles is opened.
All Pole Dead
The DDB All Pole Dead if linked in the PSL, indicates all pole are dead (The 3 poles are
open).
4.3
Current Transformer Supervision (CTS)
The current transformer supervision feature is used to detect failure of one or more of the ac
phase current inputs to the relay. Failure of a phase CT or an open circuit of the
interconnecting wiring can result in incorrect operation of any current operated element.
Additionally, interruption in the ac current circuits risks dangerous CT secondary voltages
being generated.
4.3.1
The CT Supervision Feature
The CT supervision feature operates on detection of derived zero sequence current, in the
absence of corresponding derived zero sequence voltage that would normally accompany it.
The voltage transformer connection used must be able to refer zero sequence voltages from
the primary to the secondary side. Thus, this element should only be enabled where the VT
is of five limb construction, or comprises three single phase units, and has the primary star
point earthed.
Operation of the element will produce a time-delayed alarm visible on the LCD and event
record (plus DDB 125: CT Fail Alarm), with an instantaneous block for inhibition of protection
elements. Protection elements operating from derived quantities (Broken Conductor, Earth
Fault, Neg Seq O/C) are always blocked on operation of the CT supervision element.
The following table shows the relay menu for the CT Supervision element, including the
available setting ranges and factory defaults:-
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