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The main function of substation

Substations serve as sources of energy supply for the local areas of distribution in which they are located. Their main functions are the following:

1. To receive energy transmitted at high voltage (in Philippines, it is usually 230 kV or 138 kV transmission voltage and 69 kV sub-transmission voltage) from the generating stations;

2. To Reduce the voltage to a value appropriate for local use and provide facilities for switching; and

3. To Provide points where safety devices may be installed to disconnect circuits or equipment in the event of trouble.

Voltage on the outgoing distribution feeders. can be regulated at a substation. It is also a convenient place to make measurements to check the operation of various parts of the system.

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