Current Transformer Ratio - janitza Prophi Operating Instructions Manual

Reactive Power Controller

Current transformer ratio

At the measuring in-
put of the current
measure-ment either /
5A or /1A current
transformers can be
connected. In order to get a correct current and power
indication, the current transformer ratio of the connected
current transformer must be set to Prophi. If the current
is measured via a sum current transformer, the total
current transformer ratio must be set.
Example 1: Current transformer 500A/5A
The current transformer ratio is now calculated to
500A : 5A = 100
A ratio of 100 must be set on the device.
Example 2: Current transformer 200A/1A
The current transformer ratio is calculated to
200A : 1A = 200
A ratio of 200 must be set on the device.
Example 3: Sum current transformer
Transformer 1
Transformer 2
Sum current transformer
The current transformer ratio is calculated to
(200A + 400A) : 5A
600A : 5A = 120
Programming
Example: Current transformer ratio 1000
Select indication for
current transformer ra-
tio using key 1.
The automatic symbol
disappears.
Select the digit to be
changed. The selected
digit is flashing.
Change the selected
digit pressing key 3.
Current transformer ratios of more but 1000 are indi-
cated with a decimal point automatically.
Example: Current transformer ratio = 1200 = 1.200k
Indication on display "1.200k"
Page 20
200/5A
400/5A
5+5/5A
ϕ ϕ ϕ ϕ ϕ 1 ϕ ϕ ϕ ϕ ϕ 2 learn 1:1... Prog
CT ratio
Automatic mode
k
= Key 1 = Key 2 = Key 3