Setting in GROUP 1 SYSTEM CONFIG Value
TV rating 145.0 MVA****
Note:
* This is the maximum load (
including overloads) that would be handled by the busbar.
Note:
** This disables the zer
o sequence filters.
Note:
*** This is the syst
em voltage.
Note:
**** This setting has no impact on the dif
ferential protection. It is used by other functions such as the thermal and through-
fault monitoring elements which are not required for busbar protection.
Now set the current differential parameters as follows:
Setting in GROUP 1 DIFF PROTECTION Value
Trans Diff Enabled
Set Mode Advance
Is1 1.200 PU
K1 20.00%
Is2 400.0e-3 PU
K2 80.00%
tdiff 0 s
Is-CTS 1.500 PU
Is-HS1 10.00 PU
HS2 Status Disabled
Zero seq filt HV Disabled
Zero seq filt LV Disabled
IH2 Diff Block Disabled
IH5 Diff Block Disabled
Circuitry Fail Enabled
Is-cctfail 100.0e-3 PU
K-cctfail 10.00%
Cctfail Delay 5.000 s
Note:
S
et the Circuitry Fail alarm to Enabled and set K-cctfail to 15% to allow the maximum composite error of 10% that may be
introduced by class 10P current transformers. Is-cctfail is typically set between 5 to 20% to prevent CT noise and differential
current caused by load imbalance. This element is typically delayed by 5 s.
Chapter 6 - Transformer Differential Protection P64x
132 P64x-TM-EN-1.3
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