DSE DSE7110 MKII, Operator'S Manual

Page: 31 / 100

Installation
31
4.1.6 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
51 CT Secondary for L1
2.5mm²
AWG 13
Connect to s1 secondary of L1 monitoring CT
52 CT Secondary for L2
2.5mm²
AWG 13
Connect to s1 secondary of L2 monitoring CT
53 CT Secondary for L3
2.5mm²
AWG 13
Connect to s1 secondary of L3 monitoring CT
55 CT Common
2.5mm²
AWG 13
Connect to s2 secondary of L1, L2 & L3 monitoring CTs and ground
4.1.6.1 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.
TO GENERATOR
TO LOAD
POLARITY OF CT PRIMARY
Labelled as
p1,
k
or K
Labelled as
p2,
l
or L