Voltage Transformers; Current Transformers; Auxiliary Equipment - Eaton Power Xpert UX 12 User Manual

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.
®
Power Xpert UX with W-VACi circuit breaker 6063308 G01 01 14 July 2011 www.eaton.com
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Fig. 2-4 Mimic panel
1. Voltage Detection System
2. Position indicator
3. Status indicator
4. Measuring and selector switch
Product description
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