2014年11月12日星期三

The advantages and disadvantages of dc and ac withstand voltage test


AC Electric motor Plastic fan parts 
Specifications
1. Customised 
2. good quality 
3. 20 years manufacturing experience 

4. Delivery Detail: 20-35 days after receiving payment 
Dc withstand voltage test: can effectively detect insulation be affected with damp be affected with damp, the overall defects such as dirt, and can pass the curves of relationship between electric current and leakage current found local defect of the insulation. Three phase motor According to the insulation resistance under dc voltage is due to the partial pressure, therefore, can more effectively than communication found end insulation defects. At the same time, due to the insulation under dc voltage is basically do not produce dielectric loss, therefore, less damaging dc withstand voltage of the insulation. In addition, since only the dc withstand voltage supply small leakage current, thus the required test equipment capacity is small, easy to carry. 


Totally Enclosed Protect Feature and Three-phase Phase low rpm ac electric motor

Specifications
Specifications1.3-phase asynchronous motors 
2.IEC standard 
3.OEM 
4.Voltage:50HZ &60HZ;380V&415V 

5.Protection class: IP54 
Ac withstand voltage test, the test equipment electric fan motor parts voltage of 2.5 times and above, from the thermal breakdown of dielectric loss point of view, can effectively find the partial defects and the weakness of insulation aging dissociation. Because mainly by the capacitive pressure under alternating voltage, so can effectively exposed equipment insulation defects. However, ac withstand voltage of insulation destructive than dc, and because the test for capacitive current, so you need to test equipment of large capacity. Above all, dc withstand voltage test and power frequency ac withstand voltage test can effectively find the insulation defects, but have different characteristics, so the two methods can not replace each other, when necessary, magnet generator shall be carried out at the same time, complement each other.

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