Doc ID : ADR111A_IM_01
Ref ID : ADR111A/IM/I&P
Rev No. : 04
Page No. : 35 of 127
ADR111A /
ADR211A
2.3.4
Current Transformer (CT) Circuit
Do not open the secondary circuit of a live CT as high voltage produced may be lethal to
personnel and could damage insulation. Generally, for safety, the secondary of the line CT
must be shorted before opening any connection.
2.3.5
Insulation and dielectric strength testing
Insulation testing may leave capacitors charged up to a hazardous voltage. At the end of
each part test, the voltage should be gradually reduced to zero, to discharge capacitors, as
this may result in damage.
2.3.6
Cables and Connectors
This section describes the type of wiring and connections that should be used when installing
the device. For pin-out details please refer to the wiring diagrams.
Caution: Before carrying out any work on the equipment, user should be
familiar with the Safety Section and the ratings on the equipment’s rating
label.
Figure 5: Rear view-Terminal Connection of ADR111A/ ADR211A
2.3.7
CT/Auxiliary power/ output/ serial port connections
The terminal blocks used for ADR111A/ ADR211A relay are as shown below.
The terminal block of ADR111A/ ADR211A consists of up to 18 x M4 screw terminals. M4
terminal blocks are used for CT connections, auxiliary power, output contact and rear serial
port connections. The wires should be terminated with rings using 90° ring terminals, with no
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