Type VOZ-20 Voltage Transformer (English

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Type VOZ-20
Voltage Transformer
Medium Voltage Instrument Transformer
34.5 kV Outdoor, 200 kV BIL
60 Hertz
Application
The VOZ-20 voltage transformer is used to accurately transform 34.5 kV system voltages to 115/69 kV (or 67.08 kV)
secondary voltages for metering and relaying applications.
Construction Features
The layer wound and shielded high voltage winding is centered on the low voltage winding. Two Wescors placed through
and around the windings are protectively cushioned and secured to a support frame.
The core and coil assembly is cast under vacuum in a polyurethane resin formulated for outdoor service, combining
superior arc track, ozone and ultraviolet resistive properties with physical strength and flexibility.
The primary line terminals are electro-tin plated copper and accommodate #10 to 250 MCM conductor.
Secondary terminals are clamp-type and are sized for #14 through #3 wire. A ground terminal is also provided for
grounding secondary circuit at the transformer.
The molded, glass filled polypropylene junction box has a one-inch conduit hub on either end and a knock out for a oneinch conduit fitting on the bottom. The box is anchored to the body of the transformer with screws, and can easily be
detached, simplifying installation and change out procedures.
The base is constructed of "marine environment resistant" aluminum. Six .375 screws secure the base to the core and coil
support frame.
Electrical Clearances (L-Grd):
VOZ-20
Strike 16.00 in. (406 mm)
Creep 27.25 in. (692 mm)
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Selector Guide
Style Number
Primary Voltage
Winding Ratio
7525A92G01
20125/34500Y
175/300:1
7525A92G02
27600/27600Y
240/400:1
7525A92G03
34500/34500Y
300/500:1
Ratings
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Accuracy Class:
0.3 W, X, M, Y, Z and 0.6 ZZ (X1-X3)
0.3 W, X, M, Y, 0.6 Z and 1.2ZZ (X2-X3)
Continuous Thermal: 2000 VA @ 30ºC ambient
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Dimensions
Weight: 148 lbs.
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Curves
May 2005
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Refer to Price List 42-900 for more information
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ABB Inc.
3022 NC 43 North
Pinetops, NC 27864
Tel: + 1-252-827-3212
www.abb.com/mediumvoltage