Calculation examples
Here is an example of power calculation. Both wiring methods (line-to-line and line-to-neutral) are
checked with the same signal injection. The voltage scaling is set to 20 000 : 100 V and the current
scaling is set to 1000 : 5 A.
Voltages (line-to-neutral):
Currents:
U
L1
= 40.825 V, 45.00°
I
L1
= 2.5 A, 0.00°
U
L2
= 61.481 V, -159.90°
I
L2
= 2.5 A, -120.00°
U
L3
= 97.742 V, 126.21°
I
L3
= 2.5 A, 120.00°
Name
Value
Name
Value
Name
Value
Name
Value
L1 (S)
L1 (S)
4.08 MVA
L2 (S)
L2 (S)
6.15 MVA
L3 (S)
L3 (S)
9.77 MVA
3P
3PH (S)
H (S)
20.00 MVA
L1 (P)
L1 (P)
2.89 MW
L2 (P)
L2 (P)
4.72 MW
L3 (P)
L3 (P)
9.71 MW
3P
3PH (P)
H (P)
17.32 MW
L1 (Q)
L1 (Q)
2.89 Mvar
L2 (Q)
L2 (Q)
-3.94 Mvar
L3 (Q)
L3 (Q)
1.06 Mvar
3P
3PH (Q)
H (Q)
0.01 Mvar
L1 T
L1 Tan
an
1.00
L2 T
L2 Tan
an
-0.83
L3 T
L3 Tan
an
0.11
3P
3PH T
H Tan
an
0.00
L1 Cos
L1 Cos
0.71
L2 Cos
L2 Cos
0.77
L3 Cos
L3 Cos
0.99
3P
3PH Cos
H Cos
0.87
Voltages (line-to-line):
Currents:
U
L12
= 100.00 V, 30.00°
I
L1
= 2.5 A, 0.00°
U
L23
= 100.00 V, -90.00°
I
L2
= 2.5 A, -120.00°
I
L3
= 2.5 A, 120.00°
A
AQ
Q-M257
-M257
Instruction manual
Version: 2.07
48
© Arcteq Relays Ltd
IM00021
Summary of Contents for AQ-M257
Page 1: ...AQ M257 Motor protection IED Instruction manual...
Page 2: ......
