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Info Calculation Calculation Calculation
Section -1 or (2L) MCGG62 1.2 0.5 MCGG22 0.4 0.5 1.0 10 P 10 10 100 : 5 100 24.00 2.40
Section 0 MCGG62 1 0.5 MCGG22 0.5 0.5 1.0 10 P 10 10 100 : 5 100 20.00 2.00
Section 1 MCGG61 0.5 0.5 MCGG21 0.1 0.5 1.0 10 P 10 15 100 : 5 150 10.00 1.50
Section 2 CDG66 7.5 3.1 CDG16A 1.5 3.1 6.2 10 P 10 15 150 : 5 24 225.00 5.44
Section 3 CDG66 8.75 3.1 CDG16A 2 3.1 6.2 10 P 10 15 100 : 5 24 175.00 4.23
Section 4 CDG66 8.75 3.1 CDG16A 2 3.1 6.2 10 P 10 15 100 : 5 24 175.00 4.23
Section 5 CDG36 5 2.9 CDG16A 2 2.9 5.8 10 P 10 15 500 : 5 26 500.00 12.93
Section 6 CDG66 7.5 3.1 CDG16A 2 3.1 6.2 10 P 10 15 100 : 5 24 150.00 3.63
Section 7 CDG66 7.5 3.1 CDG16A 2 3.1 6.2 10 P 10 15 100 : 5 24 150.00 3.63
Section 8 - - - - - - - - - - -
Section 9 CDG66 7.5 3.1 CDG16A 2 3.1 6.2 10 P 10 15 100 : 5 24 150.00 3.63
Section 10 CDG66 7.5 3.1 CDG16A 2 3.1 6.2 10 P 10 15 100 : 5 24 150.00 3.63
Section 11 CDG36 5 2.9 CDG16A 2 2.9 5.8 10 P 10 15 500 : 5 26 500.00 12.93
Section 12 CDG66 7.5 3.1 CDG16A 2 3.1 6.2 10 P 10 15 100 : 5 24 150.00 3.63
Section 13 CDG66 8.75 3.1 CDG16A 2 3.1 6.2 10 P 10 15 100 : 5 24 175.00 4.23
Section 14 CDG66 5 2.9 CDG16A 2 2.9 5.8 10 P 10 15 150 : 5 26 150.00 3.88
Section 15 MCGG61 0.5 0.5 MCGG21 0.1 0.5 1.0 10 P 10 15 100 : 5 150 10.00 1.50
Section 16 CDG66 7.5 2.9 CDG16A 1.5 2.9 5.8 10 P 10 15 150 : 5 26 225.00 5.82
Section 17 MCGG62 1 0.5 MCGG22 0.5 0.5 1.0 10 P 10 10 100 : 5 100 20.00 2.00
Section 18 MCGG62 1.2 0.5 MCGG22 0.4 0.5 1.0 10 P 10 10 100 : 5 100 24.00 2.40
Effective accuracy limit factor of CT = x CT accuracy limit factor (ALF) Tap Set Burden
2.5 2.5
3.8 2.7
Sum of relays & devices connected to the CT 5 2.9
6.3 2.9
7.5 3.1
Relay setting current = Tap setting x 8.8 3.1
10 3.4
Relay saturation currnet = Tap setting x x
Total relay burden =
CT Burden
Total relay burden
Overcurrent
Relay type
Overcurrent
Tap
Saturation
Current (kA)
CT
Accuracy
Limit factor
(ALF)
CT
Burden
(VA)
Effective
ALF at
actual relay
burden
Relay Setting
Current (A)
Calculated by:
Verified by:
Relay Information
CT Ratio
CT Accuracy
ClassEarth Fault
Burden
(VA)
Total Relay
Burden (VA)
Effective accuracy limit factor of CT
Overcurrent
Burden (VA)
Earth Fault
Relay type
Earth
Fault Tap
-
1000
CDG Relay
Minimum Grading Margin - Between two electronic devices
Primary CT Ratio
Secondary CT Ratio
Primary CT Ratio
Secondary CT Ratio
-
CT Information
Circuits
00.5
11.5
22.5
33.5
4
2.5 3.8 5 6.3 7.5 8.8 10
Bu
rde
n (
VA
)
Tap Setting Value
Burden vs Tap Setting
Burden
Tap Setting Value
