Accura 2300/2350 User Guide
Chapter 5 Measurement Description
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2011 Rootech Inc. All Rights Reserved
Page 201
The magnitude of total reactive power is calculated by calculating the magnitude of vector difference between
the total apparent power and the total active power. The sign of the total reactive power is the sign of the total
reactive power calculated by the vector sum method mentioned above.
𝑄
𝑡
= ±√𝑆
𝑡
2
− 𝑃
𝑡
2
Fig 5.8 Arithmetic Sum for Total Apparent Power
St
Pa
Pb
Pc
Qt
| St |
Pt
Qa
Sa
Sb
Pb
Qb
Pc
Qc
Sc
Power Factor(PF) Measurement
Power factor is calculated as the ratio of the effective power to the apparent power. The sign of the power
factor is a positive or negative value depending on the sign of the active power. If it is positive, it shows the
power receiving state. If it is negative, it shows the power delivering state.
If the apparent power is zero, the power factor cannot be calculated normally. In this case, it can be set to 1.0
or 0.0 display, and is set to default to 1.0 display.
𝑃𝐹
𝑎
=
𝑃
𝑎
𝑆
𝑎
,
𝑃𝐹
𝑏
=
𝑃
𝑏
𝑆
𝑏
,
𝑃𝐹
𝑐
=
𝑃
𝑐
𝑆
𝑐
𝑃𝐹
𝑡
=
𝑃
𝑡
𝑆
𝑡
Sign of power factor can be removed by setting. In this case, the power receiving/delivering state cannot be
known only by the power factor value. The power factor when removing the sign is as follows.
𝑃𝐹
𝑎
= |
𝑃
𝑎
𝑆
𝑎
| ,
𝑃𝐹
𝑏
= |
𝑃
𝑏
𝑆
𝑏
| ,
𝑃𝐹
𝑐
= |
𝑃
𝑐
𝑆
𝑐
|
𝑃𝐹
𝑡
= |
𝑃
𝑡
𝑆
𝑡
|
Summary of Contents for Accura 2300 Front
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