Low-voltage cables are used for the incoming and outgoing lines of the distribution box, and the selection of cables should meet the technical requirements. For example, the 30kVA and 50kVA transformers use VV22-35×4 cables for the incoming line of the distribution box, and the VLV22-35×4 cables of the same specifications are used for the branch outlet; the VK22-50 is used for the incoming lines of the 80kVA and 100kVA transformer distribution boxes ×4, VV22-70×4 cables, VLV22-50×4 and VLV22-70×4 cables are used for the shunt outlets respectively, and the cables are crimped to the copper and aluminum wiring noses, and then connected to the wiring pile heads in the distribution box with bolts .
Selection of fuses (RT, NT type). The rated current of the total overcurrent protection fuse of the low-voltage side of the distribution transformer should be greater than the rated current of the low-voltage side of the distribution transformer, generally 1.5 times of the rated current. The rated current of the melt should be in accordance with the allowable overload multiple and fuse of the transformer The characteristics of the device are determined. The rated current of the melt of the overcurrent protection fuse of the outlet circuit should not be greater than the rated current of the total overcurrent protection fuse. The rated current of the melt is selected according to the normal maximum load current of the circuit and should avoid the normal peak current.
In order to analyze the reactive power of the rural low-voltage power grid, install a DTS (X) series of active and reactive two-in-one multifunctional energy meter (installed on the side of the meter board) of the meter to replace the original Three single-phase electric energy meters (DD862 series meters) to facilitate online operation monitoring of the load.
Post time: May-25-2022