DSE Model 7000 Series Control and Instrumentation System Operators Manual
22
Part No. 057-074 7000 Series OPERATING MANUAL ISSUE 2 02/05/2008 ADM
4.2.6 GENERATOR CURRENT TRANSFORMERS
WARNING!:- Do not disconnect this plug when the CTs are carrying current. Disconnection will open
circuit 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 7000 series module has a burden of 0.5VA on the CT. Ensure the CT is rated for the burden
of the 7000 series 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 Gen L1
2.5mm²
AWG 13
Connect to s1 secondary of L1 monitoring CT
52 CT Secondary for Gen L2
2.5mm²
AWG 13
Connect to s1 secondary of L2 monitoring CT
53 CT Secondary for Gen L3
2.5mm²
AWG 13
Connect to s1 secondary of L3 monitoring CT
Connection to terminals 54 & 55
The function of terminals 54 and 55 change position depending upon wiring topology as follows :
Type Topology Pin
No
Description CABLE
SIZE
7200
series
All
54 DO NOT CONNECT
55 Common for CTs connected to L1,L2,L3
2.5mm²
AWG 13
7300
series
No earth fault measuring
54 DO NOT CONNECT
55 Common for CTs connected to L1,L2,L3
2.5mm²
AWG 13
Restricted earth fault measuring
54
Common for CTs connected to
L1,L2,L3,N
2.5mm²
AWG 13
55 Connect to CT on the neutral conductor
2.5mm²
AWG 13
Un-restricted earth fault measuring
(Earth fault CT is fitted in the neutral to earth
link)
54 DO NOT CONNECT
55 Common for CTs connected to L1,L2,L3
2.5mm²
AWG 13
NOTE:- Terminals 56 to 59 are not fitted to the 7200 / 7300 series controller.
NOTE:- Take care to ensure correct polarity of the CT primary as shown below. If in doubt, check with
the CT supplier.
CT labelled as
p1,
k
or K
CT labelled as
p2,
l
or L
To Supply
To Load
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