2.1.5 Voltage transformers
The installation may include a number of voltage
transformers to measure the voltage on the cable side.
Voltage transformers are fixed type. Each voltage
transformer is fitted with 3 primary fuses.
Cable side mounting:
Fixed in the cable compartment of a circuit breaker
or contactor panel (to suit client requirements).
Voltage transformers can also be mounted in the
bus-section or the riser panels as required.
For special arrangements, a withdrawable busbar side
voltage transformer truck can be provided.
2.1.6 Current transformers
Power Xpert
®
UX switchgear can be equipped with
current transformers for protection, measuring and
metering.
Current transformers are always fitted in the rear of the
cable compartment or in the riser / sectionaliser panel.
Standard version:
At the cable connection points for the feeder panels
or supply panels.
Customer-specific version:
In the riser or bus-section panel.
2.1.7 Auxiliary equipment
Auxiliary equipment such as relays, position indicators,
meters and instruments are housed in the low-voltage
compartment of each switch panel.
Measuring and indicating equipment is fitted to the door
of the low-voltage compartment. This also includes a
circuit mimic diagram.
Voltage Detection System
The voltage indicator consists of three Light Emitting
Diodes (LEDs) mounted in a small panel on the low-
voltage compartment of a switch panel. Each LED is
connected to a measurement capacitor connected to a
phase of the primary cable. The LEDs light up when the
cable is live. This indicates that the cable is live without
the use of a voltage transformer.
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