Measurements and settings
Imbalances
54
TemBreak
PRO
P_SE-UM-001-EN
– V1.2.0
Current and Voltage Imbalances
The P_SE OCR calculates in real-time (every second) current and voltage imbalances as expressed as a % in relation to the arithmetic mean (average
value)
Current imbalance I
p Unb
is expressed as a % in relation to the arithmetic mean RMS current I
avg
.
I
avg
=
I
1
+
I
2
+
I
3
3
I
p Unb
=
I
ph
- I
avg
I
avg
× 100
where p = phase: 1, 2, 3
Example, the calculation of I
1 Unb
is as follows and per the below illustration:
I
avg
=
I
1
+ I
2
+ I
3
3
=
92 A
+ 110 A
+ 98 A
3
= 100 A
I
1 Unb
=
I
1
- I
avg
I
avg
× 100 =
92 - 100
100
× 100
∴
I
1 Unb
= -8.00 %
Voltage imbalance U
pg Unb
is expressed as a % in relation to the arithmetic mean RMS Ph-Ph voltage U
avg
and Ph-N voltage V
avg
where applicable.
U
avg
=
U
12
+ U
23
+ U
31
3
V
avg
=
V
1N
+ V
2N
+ V
3N
3
U
pb Unb
=
U
ph-ph
- U
avg
U
avg
× 100
where pb = ph-ph: 12, 23, 31
V
pN Unb
=
V
ph-N
- V
avg
V
avg
× 100
where pN = ph-N: 1N, 2N, 3N
Example, the calculation of U
23 Unb
is as follows and per the below illustration:
U
avg
=
U
12
+ U
23
+ U
31
3
=
407 V
+ 418 V
+ 411 V
3
= 412 V
U
23 Unb
=
U
23
- U
avg
U
avg
× 100 =
407 - 412
412
× 100
∴
U
23 Unb
= +1.46 %
I
1
= 92 A
I
avg
= 100 A
I
1
= 110 A
I
1
= 98 A
I
1 Unb
= -8.00 %
I
2 Unb
= +10.00 %
I
3 Unb
= -2.00 %
U
12
= 407 V
U
avg
= 412 V
U
23
= 418 V
U
31
= 411 V
U
12 Unb
= -1.21 %
U
23 Unb
= +1.46 %
U
31 Unb
= -0.24 %
Summary of Contents for Terasaki TemBreak PRO P SE Series
Page 106: ...106 TemBreak PRO P_SE UM 001 EN V1 2 0 Annex A Dimensions P160 Dimensions...
Page 107: ...Annex A Dimensions 107 TemBreak PRO P_SE UM 001 EN V1 2 0 P250 Dimensions...
Page 108: ...Annex A Dimensions 108 TemBreak PRO P_SE UM 001 EN V1 2 0 P400 Dimensions...
Page 109: ...Annex A Dimensions 109 TemBreak PRO P_SE UM 001 EN V1 2 0 P630 Dimensions...
Page 111: ...111 TemBreak PRO P_SE UM 001 EN V1 2 0 Annex C I2t Let Through Curves P160_SE...
Page 112: ...Annex C I2t Let Through Curves 112 TemBreak PRO P_SE UM 001 EN V1 2 0 P250_SE...
Page 113: ...Annex C I2t Let Through Curves 113 TemBreak PRO P_SE UM 001 EN V1 2 0 P400_SE...
Page 114: ...Annex C I2t Let Through Curves 114 TemBreak PRO P_SE UM 001 EN V1 2 0 P630_SE...
Page 115: ...115 TemBreak PRO P_SE UM 001 EN V1 2 0 Annex D Peak Let Through Curves P160_SE...
Page 116: ...116 TemBreak PRO P_SE UM 001 EN V1 2 0 P250_SE...
Page 117: ...117 TemBreak PRO P_SE UM 001 EN V1 2 0 P400_SE...
Page 118: ...118 TemBreak PRO P_SE UM 001 EN V1 2 0 P630_SE...
Page 121: ...121 TemBreak PRO P_SE UM 001 EN V1 2 0 This page is intentionally left blank...
