Electrical knowledge: substation all which power supply mode

1, radial: higher reliability, for a single larger capacity load, or important loads (such as fire, elevator, medical equipment, etc.) using radial power supply. 2, trunking: better flexibility, for general lighting and general power loads using zoning trunking power supply (combined with the radial). 3, chain: for the role of the same, the same nature and capacity of the smaller equipment can be considered as a group of equipment, and a branch circuit for each device should not exceed 5 units, the total capacity should not exceed 10kW. 4, hybrid: radial and mixed circuit supply, the total capacity should not be more than 10kW. Chain type: For the equipment with the same function, same nature and small capacity, it can be regarded as a group of equipment, and a branch circuit is adopted to supply power in chain type. Primary load: dual power supply and switching at the end, self-transmission and self-recovery for non-fire-fighting loads and self-transmission and non-self-recovery for fire-fighting loads. Secondary load: dual power supply, mutual casting at the end (or other suitable location). Tertiary load: single power supply.