Measurements and settings
Power Related Measurements
59
TemBreak
PRO
P_SE-UM-001-EN
– V1.2.0
Power factor (PF and c
osφ)
The P_SE OCR calculates in real-time (every second) the total three-phase power factor (PF
tot
) from the ratio of total active power (P
tot
) to total apparent
power (S
tot
) in both MCCB system topology (3Ph or 3Ph+N). It also calculates the power factors per phase from the ratios of total active power per phase to
apparent power per phase in MCCB variants with Neutral reference:
PF
p
=
P
p
S
p
,
where p = phase: 1, 2, 3
In the case of purely sinusoidal current (with no harmonic content), the overall power factor (PF) contains only the power factor of the fundamental
frequency also referred to as displacement power factor cosφ, and thus they are equal. However, in the case of non
-linear current consumption (as is typical
in rectifiers, switch-mode power supplies, variable speed drives, and modern electric lighting), the true overall power factor PF is affected by the harmonic
content of the current waveform (THD)
, and thus PF and cosφ differ.
The relationship between PF, cosφ is thus dependent on THD
:
PF
p
=
cos φ
p
√
1 + THD
p
2
,
where p = phase: 1, 2, 3
The P_SE OCR provides independent displacement power factor (cosφ) values, in addition to PF, which is also calculated in rea
l-time (every second).
Individual power factor values per phase are only available on MCCB variants with a Neutral reference, whereas total 3-phase power factor values are
available for both system topologies.
Power Factor
Symbol
3Ph 3Ph+N
Power factor per phase
PF
1
, PF
2
, PF
3
─
✓
Total power factor
PF
tot
✓
✓
Displacement power factor per phase
cosφ
1,
cosφ
2
,
cosφ
3
─
✓
Total displacement power factor
cosφ
tot
✓
✓
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...