Explosion-proof distribution cabinets are high-voltage switchgear used for distributing electricity, controlling, protecting, and monitoring lines. However, during the actual production process, mining switches are often prone to electromagnetic drying. What are the impacts of this? Let's take a look.
For example, when the explosion-proof distribution cabinet pipe is turned on, the primary winding of the transformer will generate a significant surge current, with the primary winding ends experiencing a high surge peak voltage. At the moment of switching off, due to the leakage flux of the primary winding, some energy does not transfer from the primary winding to the secondary winding. This stored energy in the leakage inductor will form a peak decaying oscillation with the inter-electrode capacitance and resistance of the switching tube itself.
When superimposed on the shutdown voltage of the explosion-proof distribution cabinet, a shutdown peak voltage is formed. This noise is then conducted to the input/output terminals, causing conducted interference that significantly affects the normal operation of the explosion-proof distribution cabinet.
Sometimes, when the output diode of an explosion-proof distribution cabinet conducts forwardly, charge accumulates within the PN junction. When a reverse voltage is applied to the diode, the accumulated charge dissipates, generating a reverse current. In secondary rectifying circuits, the switching frequency is high, so if the stored charge dissipates in a short period, a surge of reverse current is produced.
Due to the presence of distributed capacitors and inductors in the DC output, surge-induced interference turns into high-frequency attenuation and reduced oscillation. As a result, the high-frequency switching current loop, which consists of the primary coil of a high-frequency transformer, the switch tube of an explosion-proof distribution cabinet, and filter capacitors, may generate significant spatial radiation, leading to radiation interference.
Be aware of potential interferences from explosion-proof distribution cabinets; therefore, we must exercise caution during use to minimize accidents and extend their lifespan.
