3.1.5 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 0.5VA 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 your CT supplier.
Pin
No
Description
Cable
Size
Notes
33 CT Secondary for L1
2.5 mm²
AWG 13
Connect to s1 secondary of L1 monitoring CT
34 CT Secondary for L2
2.5 mm²
AWG 13
Connect to s1 secondary of L2 monitoring CT
35 CT Secondary for L3
2.5 mm²
AWG 13
Connect to s1 secondary of L3 monitoring CT
36
CT Common
2.5 mm²
AWG 13
Connect to s2 secondary of L1, L2 & L3 monitoring CTs and ground
37
3.1.5.1 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.
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