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ONLINE CATALOG

PST-SB 250-650

Oil-Filled

Substation Class

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Application

Type PST transformers are designed to provide remote location station power needs up to 100 kVA as well as relaying performance or metering accuracy at 0.3% when loaded with IEEE burdens through ZZ. They are oil filled and hermetically sealed with a dry Nitrogen cushion.

Fabrication

Standard transformer tanks are manufactured from mild steel, protected with a zinc rich primer and acrylic top coat ANSI-70 gray paint suitable for withstanding the most rigorous environmental conditions. Porcelain clad bushings are one-piece wet process type designed to exceed IEEE standard creep and strike distances.

Magnetic circuits

All ITEC voltage transformers use high grade highly permeable silicon steel cores. Repeatability of accuracy performance from one transformer to another is dependent on consistent performance of quality core steel. For this reason all magnetic cores used in ITEC transformers are from high quality suppliers.

Primary terminals

Standard terminal for ITEC voltage PST model transformers is a four hole spade. Primary terminations are conveniently located at the top of the transformer for hook-up to high voltage lines.

Secondary terminals

Secondary terminations are brought into the low voltage compartment and secured to low voltage terminations for convenient connections. The low voltage compartment is suitably weatherproofed to maintain dry connections.

Drying and impregnation

In order to achieve the highest possible insulation integrity moisture content is minimized transformers are dried out and impregnated with transformer oil under vacuum in order to minimize moisture content. Dissipation factor readings are checked on each transformer at final test to insure proper drying has been achieved.

Testing

Every voltage transformer is tested in accordance with IEEE STD C57.13 (Latest revision). In addition ITEC tests each unit in accordance with NEMA 107. Extinction levels are required to be a minimum of 35% above operating voltage for all transformers.

Ground Connections

Each transformer is supplied with a NEMA 2-hole ground pad.

Nameplate Information

In addition to the nameplate, ratio information is stenciled onto the tank wall in 2" high numeric for remote identification.. OIL-23

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