All fault clearance is done by means of three-phase tripping of the circuit breaker.
3.1.1 Calculating settings for analogue TRM inputs 4I 1I 5U
The transformer module (TRM) has the capability of 4 current inputs (tapped to 1 or
5 A), 1 current input (tapped 0.1 or 0.5 A) and 5 voltage inputs.
The line phase CTs (three-phase current transformer group) are connected to inputs 1
– 3 (L1, L2 and L3).
Current inputs 4 and 5 are not used.
The line phase VTs (three-phase voltage transformer group) are connected to inputs
6 - 8 (L1, L2 and L3).
The 145 kV busbar 1 phase VT is connected to input 9 (L1).
Voltage input 10 is not used.
1. Set the current transformer inputs.
1.1. Set CTStarPoint1 to To Object .
The CT secondary is earthed from the line.
1.2. Set CTSec1 to 1 A.
1.3. Set CTPrim1 to 1000 A.
1.4. Set the same values for current inputs 2 and 3.
2. Set the voltage transformer inputs.
2.1. Set VTSec7 to 110 V.
(The rated secondary voltage of the VT, given as phase-to-phase voltage)
2.2. Set VTPrim6 to 143 kV .
(The rated secondary voltage of the VT, given as phase-to-phase voltage)
2.3. Set the same values for current inputs 7 and 8.
2.4. Set VTSec9 to 110 V.
(The rated secondary voltage of the VT, given as phase-to-phase voltage)
2.5. Set VTPrim9 to 143 kV.
(The rated secondary voltage of the VT, given as phase-to-phase voltage)
3.1.2 Preprocessing blocks (SMAI)
It is possible to use frequency adapted fourier filtering in the preprocessing blocks. In
this application, the frequency is close to nominal. Therefore, the setting of the
parameters DFTReference and DFTRefExtOut (when available) is: InternalDftRef is
used.
1MRK 505 291-UEN A Section 3
REQ650 setting examples
45
Application manual
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