Electric capacitor failure analysis of medium frequency induction furnace
2. The capacitance external lighter: the machine is running, the external flint, capacitor shell is not good for ground insulation series or parallel booster series capacitors are connected to the parallel capacitor shell.
3. The cooling water can result in heat insulation damage, should be timely treatment. The insulation of the electric capacitor check the insulation resistance of the condenser is divided into the poles, the multistage electrical insulation between the group and the poles of the insulation resistance of the shell due to its capacitance is composed of capacitor in series, in parallel components, the insulation of the individual components degradation will not reduce insulation resistance of the capacitor, so remote sensing electrode insulation resistance may be difficult to find defects. So don't usually do this test, and only do the poles or multistage insulation resistance measurement of the shell. According to the rated voltage with different number of shaking table. Now rated voltage 750 v, for example, use 1000 v shake table, should be taken before shake side will capacitor discharge. Roll side, should first will shake table to the specified speed, after waiting for its smooth pointer, the poles of the shaking table pick to capacitor, continue to turn shake table. Beginning, because of capacitor charging, pointer will decline, then slowly rises until stable, at this time of reading very capacitor electrode resistance, usually 1000 v is not less than 1 megohm. Read number again later, should first will shake table line, is to stop shaking. Otherwise, easy to burn out because of the capacitor discharge header. After telemetering, capacitor discharge, should be to avoid electric shock.
These points are to be noted. These services must be under taken before winter. In order to safe yours HVAC unit. Heating and Cooling Milton
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