13.8 Calculation Formula
233
10
13
Cha
p
ter 13 Spe
cificatio
ns
c: measured channel, M: number of samples per period, s: number of sampling points
-3. RMS Voltage (Urms), RMS Current (Irms)
Single Phase 2-wire
1P2W
Single Phase
3-wire
1P3W
3-Phase, 3-Wire,
2-Measurement
3P3W2M
3-Phase, 3-Wire,
3-Measurement
3P3W3M
3-Phase, 4-Wire
3P4W
Urms
U
1
U
4
Uc=
U
1
U
2
U
4
Line-to-line voltage
U
12
=
U
32
=
U
31
is calculated from
the RMS value for
(U3s=U2s-U1s)
.
Line-to-line voltage
U
12
=
U
23
=
U
31
=
Phase voltage
U
1
U
2
U
3
U
4
U
4
U
4
Phase voltage
U
1
=
U
2
=
U
3
=
Line-to-line voltage
U
12
=
U
23
=
U
31
=
U
4
U
4
Uave=
Line-to-line voltage
Uave=
Line-to-line voltage
Uave=
Phase voltage
Uave=
Phase voltage
Uave=
Line-to-line voltage
Uave=
• Calculated with 10 waveforms (50 Hz measurement) or 12 waveforms (60 Hz measurement). For 400 Hz measurement,
the calculation is performed with 80 waveforms.
• For 3-phase 3-wire connections, the phase voltage is calculated so that the neutral point is at the center. The CH4 RMS
voltage can be calculated regardless of the connection type.
Irms
I
1
I
4
Ic=
I
1
I
2
I
4
I
1
I
2
I
3
is calculated from
the RMS value for
(I3s=-I1s-I2s)
.
I
4
I
1
I
2
I
3
I
4
I
1
I
2
I
3
I
4
Iave=
Iave=
Iave=
Iave=
• Calculated with 10 waveforms (50 Hz measurement) or 12 waveforms (60 Hz measurement). For 400 Hz measurement,
the calculation is performed with 80 waveforms.
• The CH4 RMS current can be calculated regardless of the connection type.
Phase
System
Items
1
M
-----
Ucs
(
)
2
s
0
=
M 1
–
1
M
-----
U1s
(
)
2
s
0
=
M 1
–
1
M
-----
U2s
(
)
2
s
0
=
M 1
–
1
M
-----
U1s
(
)
2
s
0
=
M 1
–
1
M
-----
U2s
(
)
2
s
0
=
M 1
–
1
M
-----
U3s
(
)
2
s
0
=
M 1
–
Phase voltage
1
M
-----
U1s U3s
–
3
--------------------------
2
s
0
=
M 1
–
1
M
-----
U2s U1s
–
3
--------------------------
2
s
0
=
M 1
–
1
M
-----
U3s U2s
–
3
--------------------------
2
s
0
=
M 1
–
1
M
-----
U1s U2s
–
(
)
2
s
0
=
M 1
–
1
M
-----
U2s U3s
–
(
)
2
s
0
=
M 1
–
1
M
-----
U3s U1s
–
(
)
2
s
0
=
M 1
–
1
2
--- U
1
U
2
+
(
)
1
2
--- U
12
U
32
+
(
)
1
3
--- U
12
U
23
U
31
+
+
(
)
1
3
--- U
1
U
2
U
3
+
+
(
)
Phase voltage
1
3
--- U
1
U
2
U
3
+
+
(
)
1
3
--- U
12
U
23
U
31
+
+
(
)
1
M
-----
Ics
(
)
2
s
0
=
M 1
–
1
2
--- I
1
I
2
+
(
)
1
2
--- I
1
I
2
+
(
)
1
3
--- I
1
I
2
I
3
+
+
(
)
1
3
--- I
1
I
2
I
3
+
+
(
)
HIOKI PQ3198A961-03
Содержание PQ3198
Страница 2: ...HIOKI PQ3198A961 03...
Страница 6: ...Contents iv HIOKI PQ3198A961 03...
Страница 20: ...Usage Notes 14 HIOKI PQ3198A961 03...
Страница 44: ...2 3 Display Items and Screen Types 38 HIOKI PQ3198A961 03...
Страница 58: ...3 8 Turning the Power On and Off Setting the Default Language 52 HIOKI PQ3198A961 03...
Страница 102: ...5 8 Factory Settings 96 HIOKI PQ3198A961 03...
Страница 116: ...6 4 Displaying Harmonics 110 Holding the display Hold Measured values and waveforms will be held HIOKI PQ3198A961 03...
Страница 198: ...12 4 Downloading Recorded Data to Computer 192 HIOKI PQ3198A961 03...
Страница 264: ...14 4 Disposing of the Instrument 258 HIOKI PQ3198A961 03...
Страница 296: ...A32 HIOKI PQ3198A961 03...
Страница 299: ...Index Index 3 Index Wiring 73 Z Zero adjustment 53 Zero phase A28 HIOKI PQ3198A961 03...
Страница 300: ...Index Index 4 HIOKI PQ3198A961 03...
Страница 301: ...HIOKI PQ3198A961 03...
Страница 302: ...HIOKI PQ3198A961 03...
Страница 303: ...HIOKI PQ3198A961 03...
Страница 304: ...www hioki com HIOKI PQ3198A961 03...
