In order to better display the work efficiency of the explosion-proof distribution box , we can optimize it, which is helpful to effectively reduce the failure rate of the explosion-proof distribution box. In addition, it can also increase the service life of the equipment. Then we From what aspects can the explosion-proof distribution box be optimized for design, then the small series will simply introduce it to everyone.
1, the use of protection circuit to prevent the explosion-proof power distribution box external circuit failure occurs, select a small intelligent phase loss protection device, such as selection of motor phase protection module installed in the distribution box in order to prevent the lack of low-phase operation and burn Bad motor.
2. For the distribution box with the distribution transformer capacity of 100kV·A or above, in the side wall of the cooling window in the box, the temperature control relay and axial fan should be considered and installed on the left side of the control electrical board. The box body, so that the box temperature reaches a certain value (such as 40 °C) can automatically start the exhaust fan, forcibly discharge heat to make the box heat.
3. If a new distribution platform on the column is added, a 2mm thick stainless steel plate can be selected when the explosion-proof distribution box is manufactured, and the size of the distribution box can be enlarged proportionally to increase the number of outlets, outlets, and boxes. The electrical safety distance of the body shell is beneficial to the operation and maintenance of the farm electrician and the replacement of the fuse, and it can also dissipate heat.
4. Improve the connection mode of the low-voltage capacitor bank of the original explosion-proof distribution box, and change the installation position from the AC contactor's pile head to the connection between the low-voltage inlet of the distribution box and the meter to prevent the capacitor from running. In the event of a missing phase fault in the circuit or damage to the capacitor, metering device measurements are inaccurate. In addition, the capacitor selection model should be BSMJ series products to ensure reliable and safe operation of components.
5. Selection of Residual Current Action Protectors: Products that meet the requirements of GB6829 “General Requirements for Residual Current Action Protectors†and have been certified by the China Electrotechnical Product Certification Committee. The protection device shall conform to the national standard GB13955-2005 "Installation and operation of residual current protection device". Leakage protection device breaking time, when the leakage current is rated leakage current, the action time should not exceed 0.2s.
6. Use energy-saving AC contactor products, and note that the voltage of the AC contactor coil is connected to the corresponding terminal block of the selected remaining current-operated protector. Pay attention to correct load matching. When selecting AC contactors, products with insulation class A and above shall be used, and the rated current of the main circuit contact shall be guaranteed to be greater than or equal to the load current of the controlled line.
7. The low-voltage cables shall be used for the incoming and outgoing lines of explosion-proof distribution boxes. The selection of cables shall meet the technical requirements. For example, for the distribution box of 30kVA and 50kVA transformers, use the VV22-35x4 cable for the power distribution box, the VLV22-35x4 cable with the same specifications for the branch and outlet, and the VV22-50 for the input cable of the 80kVA and 100kVA transformers. ×4, VV22-70×4 cable, branch outlets use VLV22-50×4, VLV22-70×4 cables respectively, the cable is crimped with the copper-aluminum connection nose and then bolted to the wiring pile head in the distribution box .
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