Instrument transformers
Types VIZ-15 and VIZ-15G
Indoor voltage transformers
Product features
−− 25 kV indoor
−− 150 kV BIL, 60 Hertz
−− Primary volts: 12000 - 34500
Application
The VIZ-15 and VIZ-15G indoor voltage transformers are designed
for service in metalclad switchgear and are used for metering,
relaying, or control power. Both units are available in single, double,
and tapped secondary designs with two accuracy and thermal
rating options.
Construction features
The primary and secondary coils are wound using special winding
and shielding techniques for improved voltage stress distribution.
The coils are designed to withstand continuous operation at either
1.1 or 1.25 times the line-to-line voltage level for Z burden units and
the line-to-ground voltage level for Y burden units. For some line-toground voltage units, a short-time withstand voltage of 1.9 is
available upon request.
Each coil is insulated with mylar film to provide a high dielectric
strength between layers. The coils and core are combined to create
a complete winding structure that is assembled to a support frame.
The entire assembly is vacuum cast in polyurethane for added
insulation and protection.
Fuse classifications
These units are available in three fuse classifications: mounted
fuse with hardware, unfused with hardware, or unfused without
hardware. Optional fuse kits are offered to convert unfused
styles to fused styles.
Consult your ABB sales representative concerning overvoltage
conditions for designs above the standard rated voltage factor
of 1.25.
Baseplate
The baseplate is constructed of corrosion-resistant aluminum and is
secured to the encapsulated base support.
Mounting
The VIZ-15 and VIZ-15G can be mounted in upright or cantilever
positions.
Curves
Type curves are available upon request.
Test reports
Test reports are stored electronically and can be e-mailed in
various formats at the time of shipment.
Standards
This unit can be tested to all applicable IEEE, CSA, or IEC
standards as requested.
