Power distribution system

A transformer module for a distribution substation, said transformer module comprising

• a tank having sidewalls, end walls, a top wall and a floor, insulating oil in said tank,
• a transformer having primary and secondary windings immersed in the oil in said tank,
• a radiator connected to said tank and means for circulating oil from said tank through said radiator,
• a primary bushing mounted on an angle on one of the sidewalls of said tank,
• a secondary bushing mounted on the top of said tank,
• means for connecting the primary bushing to said primary winding,
• a primary circuit breaker,
• means mounting said primary circuit breaker on the same sidewall of said tank as said primary bushing,
• a lightning arrester mounted on the top wall of said tank in close proximity to said primary bushing,
• means connecting the primary bushing, circuit breaker and lightning arrester to a high voltage power source,
• said lightning arrester being connected to said circuit breaker on the power source side, whereby said lightning arrester protects both the circuit breaker and transformer from fault conditions on the power source side.

A feeder module for a distribution substation, said feeder module comprising a housing having a transition cubicle and a feeder cubicle,

• said transition cubicle including means for connecting the transition cubicle to a low voltage source,
• said feeder cubicle including a low voltage circuit breaker, and
• shielded insulated cable assembly means connecting said transition cubicle to said feeder cubicle,
• said cable assembly means including
• a shielded cable and
• a visible break terminator at each end of said shielded cable.

A twist-lock terminator for connecting a high voltage cable to a high voltage bushing,

• said bushing having a bore contact with a radially inwardly extending pin located a spaced distance from the open end of the contact, and
• a spring biased assembly within said bore contact, said terminator comprising
• a housing formed from an insulating material,
• an electrically conductive connector connected to said cable and positioned within said housing,
• a conductive member positioned in said housing, said member being in electrical communication with said connector and having a probe adapted to be inserted into the bore contact in said bushing and engaging means on said probe for engaging the pin in said bore contact to lock the terminator to the bushing,
• said probe compressing said spring biased assembly until the slot is aligned with the pin whereby said probe can be rotated into engagement with said pin.