How to identify the damage frequency converter filtering electrolytic capacitor?

The inverter filter electrolytic capacitor what is damaged? Actually appear split outer plastic casing, aluminum shell bulge, exterior blast valve open, out of the electrolyte, insurance or crushed out, capacitor top part of the disc cracking, terminal badly corroded, cover plate deformation, shedding electrolytic capacitor has been damaged, cannot use. This time with a multimeter to measure open circuit or short circuit capacity significantly reduced, leakage is serious, The multimeter measuring ultimate stability after resistance smaller) 。 The failure reasons of capacitance analysis: 1. Filter in front of the rectifier bridge damage, alternating current (ac) directly into the capacitance. 2. Thermal environment is bad, make the condenser temperature is too high, time and damage. 3. Uneven pressure resistance is damaged, the partial pressure caused a capacitance first breakdown, subsequent related other capacitance also breakdown. 4. The device itself quality is bad, Leakage current is big, big loss, pressure and contains impurities such as chloride ions, the structure is not good, the life short) 。 5. Bad capacitor installation and insulation damage such as outsourcing, the shell to should not have on the potential of electrical connection and bad welds, poor contact fever caused damage. Capacitance change method: 1) Replace filter electrolytic capacitor had better choose the same as the original model, in the moment can't get the same model, must pay attention to the following: high voltage, leakage current, capacity and overall dimensions, polarity, the installation should be the same, and choose to withstand large ripple current, long life. 2) Change in the process of dismantling attention electrical connection ( The screw connection and welding) Solid and reliable, positive and negative can not wrong, fixed with a band to be firmly fixed, and shall not damage the capacitor insulation sheath, bleeder resistor connected as is, and to measure the resistance value, should make partial pressure evenly. 3) Electrolytic capacitor has put more than one year, should measure the leakage current value, shall not be too big, put forward first and direct current aging, direct current (dc) and lower first, reduced when the leakage current, voltage rising again, finally at rated voltage, leakage current value shall not exceed the standard value. 4) Due to the size of the capacitor is not appropriate, repair will replace the capacitor in other position, must pay attention to from the inverter module to the capacitance bus cannot be longer than the original bus, +, - two Surrounded by bus area must be small as far as possible, had better use twisted-pair cable. This is because the electrolytic capacitor connection bus to extend or +, - Bus bar surrounded area of the bus bar inductance increases, cause pulse surge up on the power module, damage power module or overvoltage damage absorption device. In case of necessity, and the other to absorb the high frequency high voltage surge capacitor with short line add to the inverter module, help absorb bus over-voltage, make up for the harm done by the capacitor connected bus extension. Over how many methods to detect damage to the inverter filter electrolytic capacitor, you dear friends have to learn?
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