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Is the explosion-proof grade and the degree of protection of explosion-proof motors the same thing?

2019-08-22 17:50:14 點擊數:246
     The parameters of explosion-proof motors generally include: explosion-proof grade, protection grade, insulation grade, etc. Explosion-proof grade refers to the selection of explosion-proof structures of various electrical equipment in different explosive gas environment hazardous areas, such as Exd IIBT4, and the protection grade refers to Electrical equipment such as motors are waterproof and dustproof. For example IP55. Sometimes it is easy to mix the explosion-proof grade and the degree of protection,       then let's talk about the meaning and difference of the explosion-proof grade and the protection grade:
1, motor explosion-proof grade
The explosion-proof grade of the motor consists of three parts:
(1) Classification of safety levels of different electrical equipment used in explosive gas areas (Zone 1, Zone 1, Zone 2). Such as explosion-proof motor selection is divided into explosion-proof type (code d), positive pressure type (p), increased safety type (e), n-type
(2) The classification of gas or vapor explosive mixture grades is divided into three types: IIA, IIB and IIC. The division of these grades is mainly based on the maximum test safety clearance (MESG) or minimum ignition current (MICR).
(3) Division of temperature groups that ignite a certain medium. Mainly divided into T1-450 °C<T, T2-300<T≤450°C, T3-200<T≤300°C, T4-135<T≤200°C, T5-100<T≤135, T6-85<T ≤100 °C.
2, the degree of protection of the motor:
     The degree of protection of the explosion-proof motor under normal conditions is IP55. It can also be made into a motor with IP65 protection level according to the special needs of users. The marking of the degree of protection consists of the characterization of the letter "IP" and the two characterization numbers appended. Examples are as follows:
(1) The first characteristic number indicates the degree of protection of the outer casing to the person and the inner member of the casing. The meaning of numbers:
0. Unprotected motor No special protection No test.
1. A motor that protects more than 50 MM solids can prevent large areas of the human body from accidentally touching or approaching the live or rotating parts of the casing. Can prevent solid foreign objects larger than 50MM in diameter from entering the shell
2. Motors with protection greater than 12MM solids can prevent solid foreign objects larger than 12MM from entering the shell.
3. Motors with protection greater than 2.5 MM solids can prevent tools or wires with a diameter greater than 2.5 MM from touching or approaching live or rotating parts within the casing.
4. Motors that protect more than 1 MM solids can prevent wires or strips with diameters or thicknesses greater than 1 MM from touching or approaching live or rotating parts within the casing.
5. Dust-proof motor It should have no harmful effects when it is splashed in any direction.
(2) The second representation number indicates the degree of protection due to the harmful effects of the enclosure entering the water. The meaning of each number:
0. Unprotected motor No special protection
1. Anti-drip motor Vertical dripping should have no harmful effects
2.15 degree drop motor When the motor is tilted from any position in any direction to any angle within 15 degrees, vertical dripping should have no harmful effects.
3. Anti-watering motor There should be no harmful effects on the water in the range of 60 degrees from the vertical line.
4. Splashproof motor. Splashing water in any direction should have no harmful effects.
5. Waterproof motor The water spray in any direction should have no harmful effects.
6. Anti-wave motor When the violent wave impact or strong water spray is applied, the water intake of the motor should not reach harmful levels.
7. Anti-immersion motor When the motor is immersed in the water of the specified pressure for a specified period of time, the water intake of the motor should not reach the harmful degree.
8. Submersible motor The motor can dive for a long time under the conditions specified by the manufacturer. Motors are generally watertight and allow water to enter for certain types of motors, but should not be harmful.
     Summary: Explosion-proof grades are set for the use environment of explosion-proof motors, and explosion-proof motors with different explosion-proof grades are used in different environments. The degree of protection is the protective measure of the explosion-proof motor during normal operation, mainly for the two main protection mechanisms of dustproof and waterproof.

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