janitza UMG 801, User Manual

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38
7.5.1 Connection variants for current measurement
Current measurement I1 to I4 and I5 to I8
Three-phase 4-conductor system
Current measurement via 3 current transformers
N
L3
L2
L1
N
L3
L2
L1
L3
L2
L1
L2
L1
I
1
30 31
I
1
30 31
I
2
32 33
I
3
34 35
I
4
36 37
N
L3
L2
L1
I
1
30 31
I
2
32 33
I
3
34 35
I
4
36 37
I
2
32 33
I
3
34 35
I
4
36 37
I
1
30 31
I
2
32 33
I
3
34 35
I
4
36 37
I
1
30 31
I
2
32 33
I
3
34 35
I
4
36 37
L3
L2
L1
I
1
30 31
I
2
32 33
I
3
34 35
I
4
36 37
Three-phase 4-conductor system
Current measurement via 2 current transformers in
systems with the same load.
N
L3
L2
L1
N
L3
L2
L1
L3
L2
L1
L2
L1
I
1
30 31
I
1
30 31
I
2
32 33
I
3
34 35
I
4
36 37
N
L3
L2
L1
I
1
30 31
I
2
32 33
I
3
34 35
I
4
36 37
I
2
32 33
I
3
34 35
I
4
36 37
I
1
30 31
I
2
32 33
I
3
34 35
I
4
36 37
I
1
30 31
I
2
32 33
I
3
34 35
I
4
36 37
L3
L2
L1
I
1
30 31
I
2
32 33
I
3
34 35
I
4
36 37
Three-phase 4-conductor system
Current measurement via 2 current transformers
(Aron circuit)
N
L3
L2
L1
N
L3
L2
L1
L3
L2
L1
L2
L1
I
1
30 31
I
1
30 31
I
2
32 33
I
3
34 35
I
4
36 37
N
L3
L2
L1
I
1
30 31
I
2
32 33
I
3
34 35
I
4
36 37
I
2
32 33
I
3
34 35
I
4
36 37
I
1
30 31
I
2
32 33
I
3
34 35
I
4
36 37
I
1
30 31
I
2
32 33
I
3
34 35
I
4
36 37
L3
L2
L1
I
1
30 31
I
2
32 33
I
3
34 35
I
4
36 37
Three-phase three-conductor system
Current measurement via 2 current transformers
(Aron circuit)
N
L3
L2
L1
N
L3
L2
L1
L3
L2
L1
L2
L1
I
1
30 31
I
1
30 31
I
2
32 33
I
3
34 35
I
4
36 37
N
L3
L2
L1
I
1
30 31
I
2
32 33
I
3
34 35
I
4
36 37
I
2
32 33
I
3
34 35
I
4
36 37
I
1
30 31
I
2
32 33
I
3
34 35
I
4
36 37
I
1
30 31
I
2
32 33
I
3
34 35
I
4
36 37
L3
L2
L1
I
1
30 31
I
2
32 33
I
3
34 35
I
4
36 37
INFORMATION
You can configure current transformer ratios
conveniently via
·The device menu.
·The GridVis
®
software.
Information on programming the current transformer
ratios can be found in section „11.4 Configuring
current transformers“ on page 63.
If the measuring range is exceeded, the
measurement display for the current shows a
warning message indicating the phase (see section
„18.1 Overrange“ on page 94).
Three-phase three-conductor system
Current measurement via 3 current transformers
N
L3
L2
L1
N
L3
L2
L1
L3
L2
L1
L2
L1
I
1
30 31
I
1
30 31
I
2
32 33
I
3
34 35
I
4
36 37
N
L3
L2
L1
I
1
30 31
I
2
32 33
I
3
34 35
I
4
36 37
I
2
32 33
I
3
34 35
I
4
36 37
I
1
30 31
I
2
32 33
I
3
34 35
I
4
36 37
I
1
30 31
I
2
32 33
I
3
34 35
I
4
36 37
L3
L2
L1
I
1
30 31
I
2
32 33
I
3
34 35
I
4
36 37
INFORMATION
Setting in the GridVis
®
software:
To activate the Aron circuit in the "Three Phase
System" measurement group mode, select
"Calculate" for current channel I2 (L2). This function
does not exist for the "Single measurements"
measurement group mode.