As we all know, when breaking the capacitor
bank, if the circuit breaker has a heavy breakdown, a loop phenomenon will appear in the circuit, and several times the operating overvoltage will appear on the capacitor terminals. Under the action of such a high operating overvoltage, strong partial discharge and dielectric damage will occur inside the metal film capacitor, and even lead to capacitor breakdown. Therefore, the quality of the circuit breaker used to switch the capacitor is closely related to the actual service life of the capacitor. It is stipulated in the national standard GB/T11024-2001 that: 'A circuit breaker suitable for switching capacitors should be used. The circuit breaker should not cause heavy breakdown that may cause excessive overvoltage during the breaking operation.' In order to prevent excessive inrush current and overvoltage, when the capacitor is withdrawn from the network, the capacitor (group) must be discharged in time. Before putting the capacitor into grid operation again, the remaining voltage on the capacitor should not exceed 10% of its rated voltage. The relationship between the service life of metal film capacitors and the ambient temperature. The temperature category of each capacitor is marked on the label, for example: '-40/AThe maximum ambient temperature that this capacitor can run continuously is: 1h average maximum temperature is 40℃, 24h average maximum temperature is 30℃, and annual average maximum temperature is 20℃. This is because at low temperatures, the viscosity of the impregnating agent inside the capacitor increases, the internal voltage decreases, and the capacitor's electrical withstand capability decreases. Putting it into operation at a temperature lower than its allowable minimum temperature is likely to cause partial discharge inside the capacitor, thereby accelerating its electrical aging and reducing the actual service life of the capacitor. On the other hand, if the metal film capacitor is operated at a temperature higher than its maximum allowable temperature for a long time, it will accelerate the thermal aging of the capacitor. Therefore, on the one hand, it is necessary to select a capacitor whose temperature category is compatible with the actual operating environment temperature. On the other hand, in the installation and use of the capacitor, special attention should be paid to the ventilation, heat dissipation and radiation problems of the capacitor under actual use conditions to make the capacitor operate The heat generated in the capacitor can be dissipated in time, and every effort can be made to reduce the temperature of the medium inside the capacitor under high temperature conditions to achieve the purpose of extending the actual service life of the capacitor.
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