A numerical differential protection relay presented in aneducational format. It connects to Protection and Relay Test Set and othermodules in the Power System range. It allows investigations into protection oftransformers, auto transformers, generators and other electrical apparatus withtwo windings. The relay shows clearly the characteristics of three-phase differentialprotection. This includes high stability during out-of-zone faults, zero sequencecurrent filtering for each winding, high-speed operation, magnetising inrushrestraint, amplitude and vector matching. The relay is housed in a robustenclosure with carrying handle. The unit mounts on the desk area of theProtection and Relay Test Set or other Power System product. It connects usinga multi-core cable from the back of the relay to the Power System products. A industrialrelay forms the main part of the unit. The lecturer or student sets up differentfault circuits on the Protection and Relay Test Set or other Power Systemproduct. They then use the keypad and display on the relay module to program itto the settings needed for the tests. They can also use the Micom S1 software anda suitable computer to program the relay module. The user then connects the 4mm shrouded sockets from the relay to the test circuits on the Power Systemproduct.
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