First, the common failure of explosion-proof distribution box:
1. Faults caused by product quality At the time of the rural power grid reconstruction, due to the large number of distribution boxes required and the short construction period, the distribution box factory needed urgent and large quantities of low-voltage electrical appliances, resulting in product quality. The phenomenon of non-strict requirements has caused some products to fail shortly after they have been put into operation.
2. Faults caused by improper selection of electrical equipment in the explosion-proof distribution box Because the choice of AC contactor capacity is not appropriate during manufacture, AC contactors of the same capacity are installed for different outlet loops, and the imbalance of the three-phase load is not considered. , And failed to part of the line contactor current level in the normal selection of models based on an increase of a current level selection, resulting in the summer of high-temperature season running AC contactor burnout.
(1) The primary distribution equipment is collectively referred to as the middle of power distribution. They will be installed in the company's substations to distribute power to lower-level power distribution equipment at different locations. This level of equipment is tight
Relying on a step-down transformer, the demand for electrical parameters is high and the output circuit capacity is also large.
(2) Secondary distribution equipment is the general term for the middle of power distribution cabinets and motor control. The power distribution cabinet is used in places where the load is relatively loose and the circuits are few; the motor controls the middle
Used for occasions where the load gathers and loops are large. They distribute the electrical energy of a certain circuit of the upper distribution equipment to the nearest load. This level of equipment should support, monitor and supervise the load supply.
(3) The final power distribution equipment is collectively referred to as the lighting power distribution box. They are far away from the middle of power supply and are scattered small-capacity power distribution equipment.
Second, explosion-proof distribution box common failures:
1. The enclosure of the explosion-proof control box adopts steel plate welding or cast aluminum alloy or 304 stainless steel die-casting. The surface is electrostatically sprayed with high pressure. The product generally adopts a composite structure consisting of a flameproof enclosure and an increased safety enclosure.
2, explosion-proof housing built-in components can be equipped with explosion-proof buttons, explosion-proof components, explosion-proof lights, explosion-proof switch and explosion-proof devices such as explosion-proof components and AC contactors, thermal relays, thermostats and various functional modules and other general electrical components; The built-in housing of buttons, control switches, and meters are explosion-proof components.
3. The internal components of the control box are arranged according to the requirements of the user and can realize multiple functions.
4. The color of the interior components and the signal lamp should be noted by the user during the selection. The product varies according to the user's requirements.
5, wiring, steel or cable, explosion-proof hose can be.
6, explosion-proof control box can be divided into vertical, hanging type.
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