ABB VIZ-11 Potential transformer for SGTC

[crm114]

Hello

Anyone have experience with this brand of PT?  Are they good for SGTC use?

[Mads Barnkob]

ABB products are generally of high quality.

From the manual you can also see that it is designed for situations that goes beyond its maximum normal specifications:

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 1.9 times the line-to-ground voltage level for Y
burden units.
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.

I have no personally used this type, but common for them all is that they are MEASUREMENT transformers. You need to protect them with some kind of current limiting, if you want it to live for a long time. Due to its polyurethane casted enclosure, failures can result in internal explosions that will send fragments flying, so stay out of direct line of fire from these transformers, or get them mounted inside a enclosure.