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Tinhtoan SEL F87T

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19 views3 pages

Tinhtoan SEL F87T

Uploaded by

chitrungbkdn
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
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SETTING FOR TESTING

Transformer Data
Rated Transformer Power 25 (MVA)
High Voltage 115 (kV)
Low Voltage 24 (kV)
W1CT Y Y or D
W2CT Y Y or D
Transformer Vector Group 12

TI ratio
TI Primary Side HV 400 (A)
TI Secondary Side HV 1 (A)
TI Primary Side LV 800 (A)
TI Secondary Side LV 1 (A)

Setting
O87P 0.35
Turn-point 1 1.4
Turn-point 2 3
Slope1 25 %
Slope 2 50 %
U87P 10

Inormal_HV 0.31378 (A)


Inormal_LV 0.75176 (A)
Slop1
Idiff 0.625
Ibias 2.5
Iside_HV 2.8125
Iside_LV 2.1875
Slop2
Idiff 1.25
Ibias 4
Iside_HV 4.625
Iside_LV 3.375
RESULT OF CALCULATOR

TAP
High Side 0.31377732
Low Side 0.75175816

Pickup Id> Test Pickup Id>>Test


Type of Fault

Side HV(A) Side LV(A)


Phase to ground 0.16473309 0.39467304
Phase to phase 0.09444697 0.22627921
Three phase 0.10982206 0.26311536

Bias Test
The First Slope The Second Slope
Side HV(A) Side LV(A) Side HV(A)
Point Test 2.5 4
Phase to ground 1.32374807 2.46670647 2.176830159
Phase to phase 0.75012391 1.41424504 1.248049291
Three phase 0.88249871 1.64447098 1.451220106
Side HV(A) Side LV(A)
4.7066598 11.276372
2.69848495 6.4651202
3.1377732 7.5175816

e Second Slope
Side LV(A)

3.8057757
2.18197807
2.5371838

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