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What different designs of the test terminal are available?

← Bushings
There are two designs of test terminals available. The traditional porcelain test terminal utilizes two castings (top and bottom) in which two porcelain insulators are cemented between the two castings. The side blades are then attached with stainless steel captive bolts. A porcelain test terminal is available in silver plated copper castings and side blades. A copper porcelain test terminal can also be tin plated vs. silver plated upon request. The cantilever strength of a copper porcelain test terminal is 575 ft-lbs. For permanent loading 50% of this rating should not be exceeded.

In 2012, PCORE launched a patented test terminal design called the SET Terminal or Seismically Enhanced Test terminal. A SET-Terminal utilizes a fiberglass rod that has a polymer sheath extruded over it as the center insulator. The top and bottom castings are then crimped onto the center insulator. The SET-Terminal is aluminum for current ratings up to 3000A. For 4000A and 5000A applications, the PCORE SET-Terminal is silver plated copper. A SET Terminal has a cantilever strength of 2500 ft-lbs. For permanent loading 50 % of this rating should not be exceeded.

For 345kV applications (1) corona ring is added to the top of the test terminal. For 500kV applications (2) corona rings are added to the test terminal.  

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