Meramec Instrument Transformer Co

Internally Mounted Oil-Type Bushing Current Transformer

Application:

The internally mounted Oil-type BCT is designed to be mounted onto a high voltage bushing shank along the ground collar, inside the tank of a power transformer, power circuit breaker or voltage regulator, that uses oil as the insulating medium. When properly installed, the Oil-type BCT can be used on higher system voltage levels while maintaining its own mere 600 Volt class rating. Its simple construction provides a low leakage product with extremely high short circuit capabilities

Construction:

The toroidal core is continuously tape-wound using cold rolled grain oriented electrical grade silicon steel, which receives a full stress relief anneal after it is wound to its specified dimensions. The secondary winding is then wound of insulated copper magnet wire over the cellulose insulated core with the turns equally spaced around the core periphery. When taps are pulled, they are wound in a manner that assures a fully distributed winding between any connections. The coil is then finished with a cotton wove fabric. All materials used have a minimum rating of 105°C and are compatible for use in hot transformer oil.

Connections:

The primary polarity H1/P1 is stamped in black on its surface. Secondary leads are typically #10 or #12 AWG grey Tefzel permanently marked with dual designations “X” and “S” for compatibility in the global market. The X1/S1 terminal represents the instantaneous polarity reference with respect to H1/P1.