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Prophi
15T-III
®
Connection of current transformer / sum current transformer
When installing the current converter, care should be taken to ensure that the load
current flows through it. The outputs of the compensation network must be installed
behind the current converter (in the direction of current flow). If the controller is
connected up via sum-current converters, the overall conversion ratio is entered.
Caution!
!
The secondary clamps of the CT
have to be short circuited before
current leads are iterrupted !
High Voltage Application
The example shows the connection in HV-application.
The measuring current is taken off primary via X/1A transformer. Measuring voltage
produced via transformer 20000/100 V. In this case, the Prophi 15T-III has to be
programmed as follows:
4 I-CONVERTER sek:
14 MEASUR.VOLTAGE: 100 V
15 V-CONVERTER: 20kV / 100 V
Meas.current
Im (X/1A)
L1 (R)
L2 (S)
L3 (T)
L1
L2
Meas.current
8
Example:
C.converter 1: 1000/5A
C.converter 2: 1000/5A
Sum-current converter: 5A+5A / 5A
C.converter ratio is: 2000 /5A
X / 1A
HIGH VOLTAGE
Meas-
voltage
Um
20000
100
L3
L1
L2
L3
Meas. voltage Um
- 7 -
Measurement via sum current converter
Feed 1
K
k
L
l
LOW VOLTAGE
20 kV / 400 V
N
Feed 2
k
K
l
L
K
L
K
L
k
l
k
l
Current
measurement
P.F.Controller
supply
voltage
Ub
L1 (R)
L2 (S)
L3 (T)
N
PE
L1
N
Supply voltage Ub
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