Tettex 2293 - Individual Mode 2 X 16 A ¦ 50 V (C)

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Theory
3.2.3 Individual Mode 2x 16A ¦ 50V (C)
This supply mode is selected, when two the corresponding phases of the high and low voltage
side of the transformer have to be measured. The three power supplies are split to the HV and LV
side. The measuring current must be selected as follows:
I1 ≤ 16.0A
I2 ≤ 16.0A
The measuring circuit for a simultaneous measurement of HV and LV on phase A of an YNd1
transformer is illustrated below. YNd measuring mode must be set to “with Rn (Ph-N)”:
1
I
2
I
U
1
U
1
U
2
U
2
N
A
B
b
a
c
16A / 50V
16A / 50V
C
The measured resistances are calculated as follows:
1
1
I
U
RRR
NAAN

(with Rn)
2
2
)(||
I
U
RRRR
cbaab

The following diagram shows the operating area for each power supply in mode C – 2x 16A ¦
50V:
Current
32A
24A
8A
+25V
+50V
+75V
+100V
400W
-100V
-75V
-50V
-25V
0V
-12.5V
2A
200W
16A
Supply
Region
(Charging)
Active Load
Region
(Discharging)
Voltage
4A