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Led Explosion Proof Light withstand voltage test method

Author: source: Datetime: 2019-06-12 18:09:26
Typical led explosion proof light withstand voltage test method:
1. Check to see if the main power switch of the withstand voltage tester is in the “off” position;
2. Unless the instrument is specially designed, all uncharged metal parts must be reliably grounded;
3. Connect the wires or terminals of all power input terminals of the device under test;
4. All power switches, relays, etc. of the equipment under test on the platform;
5. Adjust the test voltage of the withstand voltage tester to zero;
6. Connect the high voltage output line (usually red) of the withstand voltage tester to the power input of the device under test;
7. Connect the loop ground wire (usually black) of the withstand voltage tester to the accessible uncharged metal part of the device under test;
8. Close the main power switch of the withstand voltage tester and slowly raise the secondary voltage of the instrument to the required value. Generally, the boosting speed does not exceed 500 V/sec.
9. Maintain this test voltage for a specified period of time;
10. Slowly lower the test voltage;
11. Disconnect the main power switch of the withstand voltage tester. First disconnect the high voltage output line of the withstand voltage tester, and then disconnect the grounding wire of the withstand voltage tester circuit.

The following conditions indicate that the tested led explosion proof light does not pass the test:
1. When the test voltage does not rise to the specified voltage value or the voltage drops instead;
2. When the pressure tester has a warning signal;
It should be noted that due to the high voltage that is dangerous to the human body in the withstand voltage test, special care must be taken when testing.

Special considerations when testing the pressure resistance of led explosion proof lights:
1. It must be stipulated that only trained and authorized personnel can enter the test area to operate the instrument;
2. A fixed and obvious warning slogan must be placed around the test area to prevent other personnel from entering the danger zone;
3. When conducting the test, all personnel including the operator must be away from the test instrument and the device under test;
4. When the test instrument is started, do not touch its output line.

Common ways to improve the pressure resistance of led explosion proof lights:
1. Add an isolation transformer to effectively reduce the withstand voltage of the secondary line through the transformer;
2.increase the strength of the dielectric medium, such as glue, add insulation gasket;
3. Improve the pressure resistance of the circuit board:
a. Select a circuit board with high dielectric layer pressure resistance;
b. Increase the creepage distance of the circuit board.

As the circuit board where the lamp bead is arranged, the creepage distance and the wiring space are contradictory. In order to increase the creepage distance, the wiring space can only be compressed as much as possible. Try to avoid sharp objects to reduce the scratching of the insulation or the breakdown of the voltage due to tip discharge. If you try to reduce the use of self-tapping screws; when designing the circuit board, apply copper properly at the right angle and do over-treatment.
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