This design book mainly introduces the design contents and methods of the primary and secondary electrical parts of 220kV regional substation. The design includes the selection of main electrical wiring, main transformer, old transformer, bus, breaker and disconnector, configuration of transformer, selection of 220kV, 10kV and 380V lines and calculation of short-circuit current. In the design, the main high-voltage electrical equipment, such as circuit breaker, disconnector, voltage transformer, current transformer and so on, are selected and calculated, and the lightning protection design is calculated, which improves the safety of the whole substation.<br>
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