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Test Interfaces for Power Systems

ST Switch

The ST Switch is a test block for interfacing substation devices (protection relays, fault recorders, revenue meters, etc.) to the voltage and current transformers and to other equipment on the system side of a power grid.

The ST Switch uses disconnect pins to isolate the substation devices from the system side equipment. Once isolated, secondary injection can be performed using banana jacks on the front side of the test block.

The design is such that an operator can easily see whether the internal contacts are open or closed.
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C-C / C-C-C-C = 2 / 4 current modules with shorting bridge in pin/plug (current shorting takes place upon pin/plug insertion, on A-side)
V = voltage module
S = signal module
T = trip module
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