Now set the current differential parameters as follows:
Setting in GROUP 1 DIFF PROTECTION Value
Trans Diff Enabled
Set Mode Simple
Is1 100.0e-3 PU
K1 30.00%
Is2 1.000 PU
K2 80.00%
tdiff 0 s
Is-CTS 1.500 PU
Is-HS1 2.500 PU
HS2 Status Disabled
Zero seq filt HV Disabled
Zero seq filt LV Disabled
IH2 Diff Block Enabled
IH2 Diff Set 10.00%
Cross blocking Enabled
CT Saturation Disabled
No Gap Disabled
IH5 Diff Block Disabled
Circuitry Fail Disabled
5.7 SETTING GUIDELINES FOR USING SPARE CT INPUTS
The P643 and P645 can be configured to protect transformers for differential protection and the unused CT inputs
can be used to pr
otect other circuits. For example the P643 can use 2 of the 3 phase CT inputs to provide
differential protection of a 2 winding transformer by setting Winding Config to HV+LV and the unused 3rd 3
phase current input can be used to provide overcurrent protection on another circuit such as an auxiliary
transformer, as shown below:
P64x Chapter 6 - Transformer Differential Protection
P64x-TM-EN-1.3 135
To Next Page
Loading...
Need help?
General
