Precautions for installing capacitors in power supply equipment

Capacitors are indispensable electronic components in the electrical and electronic industry. The manufacturing process can be said to be quite mature, but it is inevitable that problems will arise when using them. Among them, there are problems with the quality of the capacitor itself, and it is considered improper use. In order to let everyone use the capacitor correctly, let's talk about the precautions for the installation of the capacitor in the power supply equipment.

1. The capacitor is allowed to operate for a long period of time at no more than 1.1 times the rated voltage, and can operate for no more than 30 minutes every day and night at 1.5 times the rated voltage (except for transient overvoltage). In order to extend the life of the capacitor, the capacitor should always be operated at no more than the rated voltage.

2. Capacitors are generally used in places where the ambient air temperature is -40 ° C ~ +40 ° C. The altitude of the installation area is not more than 1000 m. For low voltage shunt capacitors, it can be used at an altitude of 2000 m or less.

3, should meet the requirements of the surrounding ambient temperature, the capacitor should be installed in non-erosion steam and gas, do not like dust and other erosion, and well ventilated place. The capacitors can be mounted on the iron frame, one row or two rows, and each row should not be placed above or below three layers. There should be sufficient insulation distance between the layers. The distance between the capacitors in each layer should be no less than 100 mm. Upright (specially designed can also be placed horizontally). In order to maintain good ventilation and convenient inspection and maintenance of the personnel, the capacitor device shall be provided with a maintenance passage, and its width shall not be less than 1.2 meters.

4. Do not install horizontal layer spacers that prevent air circulation. The air outlets of the air should be installed above each group of capacitors. Before the capacitors are mounted on the racks, the capacitors must be matched to achieve the same capacity balance (accuracy is Five percent). The voltage waveform and characteristics of the line should be determined before and after the capacitor of the device, and corresponding measures should be taken, especially those with harmonic sources (rectifiers, etc.).

5. The capacitor is directly connected to the output end of the induction motor. When the motor is disconnected from the line, self-excitation may occur, so the voltage on the capacitor may rise to a value greater than the rated value. In order to avoid this, the capacitor must be selected when selecting the capacitor. The rated current is less than the no-load current of the motor.

Capacitors must pay attention to standard installation and use to ensure the protection of life and electrical appliances. If you have technical questions, please contact us and try to solve the problem for you.