68
P
φ
S
Q
1
2
3
4
P
Q
9. APPENDIX
9.1. MEASUREMENTS
9.1.1. DEFINITION
The calculations are performed in accordance with standards IEC 61557-12, IEC 61000-4-30, and IEEE 1459.
Geometrical representation of the active and reactive powers:
Figure 38
The quadrants are given for the fundamental power values.
The reference of this diagram is the current vector (fixed on the right-hand part of the axis).
Voltage vector V varies in direction according to phase angle
ϕ
.
The phase angle
ϕ
, between the voltage V and the current I, is considered positive in the anticlockwise direction.
9.1.2. SAMPLING
9.1.2.1.
Sampling period
This depends on the network frequency: 50, 60 or 400Hz.
The sampling period is calculated every second.
Network frequency f = 50Hz
Between 42.5 and 57.5Hz (50Hz ± 15%), the sampling period is locked to the network frequency. 128 samples are avail-
able for each period of the network.
Outside of the 51–69Hz band, the sampling period is 128 x 50 Hz.
Network frequency f = 60 Hz
Between 51 and 69 Hz (60 Hz ± 15%), the sampling period is locked to the network frequency. 128 samples are available
for each period of the network.
Outside of the 51–69Hz band, the sampling period is 128 x 60Hz.
Network frequency f = 400 Hz
Between 340 and 460 Hz (400 Hz ± 15%), the sampling period is locked to the network frequency. 16 samples are avail-
able for each period of the network.
Outside of the 340–460Hz band, the sampling period is 16 x 400Hz.
A DC signal is treated as outside of the frequency ranges. The sampling frequency is then, depending on the preset network fre-
quency, 6.4 kHz (50/400Hz) or 7.68 kHz (60Hz).
Active power
supplied
Active power
consumed
Reactive power
consumed
Reactive power
supplied
Source
Load
Summary of Contents for PEL 106
Page 1: ...Power energy logger EN User s manual PEL 106 ...
Page 34: ...34 Three phase 3 wire balanced 3P 3W b U12 U23 U31 f P Q S PF P Q S tan ϕ ϕ I1 U12 I1 I2 I3 ...
Page 36: ...36 Three phase 4 wire wye balanced 3P 4WYb I1 I2 I3 V1 V2 V3 VN U12 U23 U31 f P Q S tan ϕ ...
Page 37: ...37 DC 2 wire dC 2W DC 3 wire dC 3W P Q S PF ϕ I1 V1 P Q S tan ϕ P I V VN I1 I2 IN ...
Page 38: ...38 DC 4 wire dC 4W P I1 I2 I3 IN V1 V2 V3 VN V1 V2 VN ...
Page 46: ...46 Two phase 3 wire 1P 3W I1 I2 V1 V2 U12 VN P Q S P Q S ...
Page 49: ...49 P Q S ...
