Question

Can you explain the main technical considerations necessary when installing generation within the distribution network?

Explain why short-circuit fault level is generally specified in MVA and not in Amperes?

Answer 1

**Technical considerations are:

1) The Voltage rating at output of generation must be same as the Grid voltage rating to which the generation unit is being connected

2) Also the output power frequency rating of the generation unit must match the grid frequency rating

3) Power balance must be maintained , means active and reactive power balance must be maintained as per grid requirements .

4) The suitable rating circuit breakers must be installed between generation unit and Grid to break the unit during fault over grid

**

Fault level at short circuit depends on both post fault current in kA and Prefault bus bar voltage in kV whose multiplication gives us a MVA rating (kiloVolts*kiloAmps = MegaVoltsAmps = MVA) not just an Ampere rating , and based on this MVA capacity circuit breakers are designed and installed in the system . That's why short circuit fault level is specified in MVA

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