GE P645

Setting in GROUP 1 DIFF PROTECTION Value
Trans Diff Enabled
Set Mode Advance
Is1 200.0e-3 PU
K1 30.00%
Is2 1.000 PU
K2 80.00%
tdiff 0 s
Is-CTS 1.500 PU
Is-HS1 10.00 PU
HS2 Status Disbled
Zero seq filt HV Enabled
Zero seq filt LV Enabled
IH2 Diff Block Enabled
IH2 Diff Set 20%
Cross Blocking Enabled
CT Saturation Enabled
No Gap Enabled
IH5 Diff Block Enabled
IH5 Diff Set 35%
Circuitry Fail Disabled
5.3 EXAMPLE 2: AUTOTRANSFORMER WITH LOADED DELTA WINDING
Consider an autotransformer with the following specifications:
● P
ower rating: 175/175/30 MVA
● Connection type: YNyn0d1
● Voltage specification: 230/115/13.8 kV.
● HV CT ratio: 800:5
● LV CT ratio: 1200:5
● TV CT ratio: 2000:5
● HV tap range: +5% / -15% and 19 taps
Chapter 6 - Transformer Differential Protection P64x
124 P64x-TM-EN-1.3