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Test Interfaces for Power Systems

SAX / PAX

SAX is a surface mount terminal / test block combination for interfacing substation devices (protection relays, fault recorders, revenue meters, . . . ) to the voltage and current transformers and to other equipment on the system side of a power grid.

PAX is a test plug keyed to a particular configuration of SAX blocks. Once inserted into the corresponding SAX block, the PAX plug isolates the substation devices from the system side equipment while at the same time allowing connection of test equipment for secondary injection tests.
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