Hioki PQ3100 User Manual

175
Calculation Formula
14.7 Calculation Formula
The 3P4W2.5E wiring will be available after the rmware update.
1. RMS voltage refreshed each half-cycle (Urms1/2), Dip, Swell, Interruption (Intrpt), RMS current
refreshed each half-cycle (Irms1/2), Inrush current (Inrush)
Wiring
Item
Single phase
2-wire
1P2W
Single phase
3-wire
1P3W
3-phase 3-wire
3P3W2M
3-phase 3-wire
3P3W3M
3-phase 4-wire
3P4W
Urms1/2
Dip
Swell
Intrpt
[Vrms]=
U
c
U
1
U
4
U
c
=
( )
∑
−
=
1
0
2
1
M
s
cs
U
M
U
1
U
2
U
4
U
1
U
2
U
3
(U
3S
=U
2S
−U
1S
)
U
4
Line voltage
U
12
=
( )
∑
−
=
−
1
0
2
21
1
M
s
ss
UU
M
U
23
=
( )
∑
−
=
−
1
0
2
32
1
M
s
ss
UU
M
U
31
=
( )
∑
−
=
−
1
0
2
13
1
M
s
ss
UU
M
U
1
U
2
U
3
U
4
During 1P3W1U
Without
U
2
During
3P4W2.5E
U
3
(U
3S
=U
1S
−U
2S
)
(
U
1S
+U
2S
+U
3S
= 0
is
the assumption)
• For 3P3W2M wiring, it is assumed that
U
1S
−U
2S
+U
3S
= 0
• For 3P3W3M wiring, phase voltage
U
is measured from the virtual neutral point, and line voltage is
determined by calculation.
• Dip, Swell and Intrpt excludes
U
4
and
U
3
of 3P3W2M
Irms1/2
Inrush
[Arms]=
I
c
I
1
I
4
I
c
=
( )
∑
−
=
1
0
2
1
M
s
cs
I
M
I
1
I
2
I
4
I
1
I
2
I
3
(I
3S
=I
1S
−I
2S
)
I
4
I
1
I
2
I
3
I
4
• For 3P3W2M wiring, it is assumed that
I
1S
+I
2S
+I
3S
=0
.
c
: Measurement channel,
M
: Number of samples per period,
s
: Number of sample points
14
Specications

Hioki PQ3100 Specifications

General

Brand	Hioki
Model	PQ3100
Category	Measuring Instruments
Language	English