1. Improve the wiring mode of the low-voltage capacitor bank of the original distribution box, and change its installation position from the pile head on the AC contactor to the connection between the low-voltage incoming line of the distribution box and the meter. In order to prevent the inaccurate measurement of the metering device due to the phase failure of the capacitor circuit or the damage of the capacitor in operation. In addition, the capacitor selection model shall be bsmj series products to ensure reliable and safe operation of components.
　　2. For distribution box with distribution transformer capacity of 100kV · A and above, temperature control relay (ju-3 or ju-4 ultra small temperature relay) and axial flow fan shall be installed on the box on the left side above the control electrical panel, so that when the temperature in the box reaches a certain value (such as 40 ℃), the exhaust fan can be automatically started and the heat can be forced out to make the box Body heat dissipation.
　　3. If a new distribution stand on the column is added, 2mm thick stainless steel plate can be selected for the shell of the distribution box, and the size of the distribution box can be appropriately enlarged according to the proportion (on the basis of jp4-100 / 3W type used in the agricultural reform project, the size of the original box in the width direction is increased by about 100mm, that is to say, from the original 680mm to 780mm). The external dimension of the improved distribution box is 1300mm × 780mm × 500mm), so as to increase the electrical safety distance between each branch outgoing line and between the outgoing line and the box shell, which is conducive to the operation and maintenance of the agricultural electrician and the replacement of fuse parts, as well as heat dissipation.
　　4. Protection circuit shall be adopted to prevent the occurrence of external circuit fault supplied by distribution box. For example, da88cm-ii motor phase loss protection module (Shanghai Product) can be installed in the