High-quality high-voltage explosion-proof motor are explosion-proof not because they prevent other explosions, but because they employ necessary measures to prevent explosions caused by internal motor faults. For example, when an electrical fault occurs in the motor windings, the resulting sparks are confined within the motor cavity, preventing other external explosions.
Analyzing the design principles of explosion-proof motors, the basic idea is to dissipate the energy of potential explosive factors through sufficient protection levels, sufficiently long mating lengths, and small component clearances. During motor operation, the casing or components in direct contact with the external environment will not generate sparks or other consequences that could lead to an explosion. Therefore, the materials used in High-quality high-voltage explosion-proof motorcomponents must meet special regulations.
From a usage perspective, explosion-proof motors, in addition to meeting basic protection requirements, must also meet necessary explosion-proof requirements. Therefore, the design elements and manufacturing processes of explosion-proof motors are more stringent than those of ordinary motors. In other words, necessary and effective measures must be taken to achieve the explosion-proof operation goal of the motor.
Explosion-proof casing measures refer to the requirement that the explosion-proof motor casing can withstand explosion pressure. Performance verification is conducted during the manufacturing process through hydrostatic testing. The connection between the housing assemblies (such as the base and end caps) and the motor junction box should have a sufficiently narrow gap to cool any flames and explosive substances escaping from the housing to a safe temperature. This can be achieved by increasing the gap length, also known as gap explosion protection. Visually, High-quality high-voltage explosion-proof motor have relatively thick housings and relatively deep seams at the connections.
Isolation explosion protection uses liquid pure air or inert gas to isolate conductive parts that may ignite explosive mixtures from explosive gases. Immersing hazardous parts of the motor in insulating oil (usually transformer oil) is called oil-immersed explosion protection.
Maintaining a positive pressure of air or inert gas within the motor housing while it is running to prevent explosive mixtures from entering the housing is called positive pressure ventilation.
Equipment that does not generate sparks or potentially explosive hot spots during normal operation is called safety type. Specific measures for safety type structures include: protection against external impacts, reduced current load, reduced insulation heat load, maintaining constant pressure at fixed contact points, increasing leakage distances on insulation surfaces, and increasing gaps between conductive parts at different potentials.
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