The main purpose of the AC withstand voltage test of electrical equipment is to check the electrical appliances, electrical equipment, electrical devices, electrical wiring and electrical safety equipment to withstand overvoltage.
Voltage test is divided into hydraulic test and pneumatic test. Because the pressure of the pressure test is higher than the design pressure, and the container material and welding joints will inevitably have some defects, so the possibility of leakage or even cracking of the container in the pressure test process can not be completely excluded.
From the safety point of view, the pressure test should give priority to the use of hydraulic test, this is because compared to the gas, the liquid can basically be considered incompressible, hydraulic test, even if the container rupture, will not lead to catastrophic explosions. For containers which are not suitable for hydraulic test, for example, containers which are not allowed to have residual liquid in the container, or containers which can not be filled with liquid due to structural or support reasons, pneumatic pressure test can be used.
In order to avoid catastrophic accidents during the pneumatic test, where required to do pneumatic test of the container, its A, B welded joints must be 100% ray or ultrasonic inspection qualified, and should strictly follow the "capacity of the gauge" and GB150 on the test pressure, test temperature, test methods and safety measures and other aspects of the provisions.
Hydraulic test generally use water as a test medium, if necessary, can also be used does not lead to the occurrence of hazardous other liquids. Austenitic stainless steel container with water for hydraulic test should be cleaned up after water, when this requirement can not be achieved is, should control the chlorine content of the water does not exceed 25mg/L.
Extended information
Hydraulic test or pneumatic test of the container, meet the following conditions for qualified:
1) pressure test process No liquid leakage in the process of pneumatic pressure test, no air leakage by soap solution or other leak detection fluid inspection;
2) visible deformation;
3) the process of no abnormal rattling;
4) the lower limit of the specified value of the tensile strength of more than or equal to the lower limit of the container made of 540MPa material, the surface of the non-destructive testing random inspection did not find cracks.
Can carry out frequency voltage test and DC voltage test institutions: Suzhou Electrical Appliance Research Institute, the National Electrical Product Quality Supervision and Inspection Center.
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