At present, single bus section or single bus connection, mutual standby, manual or automatic switching of bus coupler switch are widely used in domestic residential areas as the main electrical connection mode at low voltage side. As the residential load of the project belongs to the third level load, the low-voltage side of 800kVA residential transformer uses the single bus connection mode. The common load includes two or more loads, so the low-voltage side of two 400KVA transformers uses the single bus sectional wiring mode, which is standby for each other.<br>
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