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3.2.5 CURRENT TRANSFORMERS
WARNING!: Do not disconnect this plug when the CTs are carrying current.
Disconnection open circuits the secondary of the C.T.'s and dangerous voltages may then
develop. Always ensure the CTs are not carrying current and the CTs are short circuit
connected before making or breaking connections to the module.
NOTE: The module has a burden of 0.25 VA on the CT. Ensure the CT is rated for the
burden of the controller, the cable length being used and any other equipment sharing the CT.
If in doubt, consult with the CT supplier.
NOTE: Take care to ensure correct polarity of the CT primary as shown below. If in doubt,
consult with the CT supplier.
Pin
Description
No
37
CT Secondary for L1
38
CT Secondary for L2
39
CT Secondary for L3
40
CT Common
41
3.2.5.1
CT CONNECTIONS
p1, k or K is the primary of the CT that 'points' towards the Generator
p2, l or L is the primary of the CT that 'points' towards the Load
s1 is the secondary of the CT that connects to the DSE Module's input for the CT measuring
s2 is the secondary of the CT that should be commoned with the s2 connections of all the other CTs
and connected to the CT common terminal of the module.
Labelled as
k
p1,
or K
To Generator
Installation
Cable
Notes
Size
2.5 mm²
Connect to s1 secondary of L1 monitoring CT
AWG 13
2.5 mm²
Connect to s1 secondary of L2 monitoring CT
AWG 13
2.5 mm²
Connect to s1 secondary of L3 monitoring CT
AWG 13
2.5 mm²
Connect to s2 secondary of L1, L2 & L3 monitoring CTs
AWG 13
and ground
Polarity of CT Primary
Page 41 of 148
Labelled as
l
p2,
or L
To Load
057-289 ISSUE: 1
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