Introduction of Lightning Arrester

Lightning Arrester is an electrical appliance used to protect electrical equipment from high transient over-voltage hazards during lightning strikes, limit the freewheeling time, and often limit the freewheeling amplitude. A lightning Arrester is sometimes called an overvoltage protector or overvoltage limiter. Next, let's take a look at the introduction of Lightning Arrester. Here are some answers.

Here is the content list:

• The scope of application of Lightning Arrester.

•  Features and principles of Lightning Arrester.

•  Operation and maintenance of Lightning Arrester.

The scope of application of Lightning Arrester.

Lightning Arrester is used to protect the insulation of AC transmission and transformation equipment from lightning overvoltage and operating overvoltage damage. Lightning Arrester is suitable for over-voltage protection of transformers, transmission lines, power distribution panels, switch cabinets, power metering boxes, vacuum switches, parallel compensation capacitors, rotating electrical machines, and semiconductor devices.

Features and principles of Lightning Arrester.

Lightning Arrester has excellent nonlinear volt-ampere characteristics, good response characteristics, no freewheeling, large flow capacity, low residual pressure, strong overvoltage suppression, anti-pollution, anti-aging, not restricted by altitude, simple structure, seamless, good sealing, long service life, and other characteristics. The Lightning Arrester presents a high resistance state under normal system operating voltage, with only microampere current passing. It exhibits low resistance under the action of overvoltage and large current, thereby limiting the residual voltage at both ends of the Lightning Arrester.

Operation and maintenance of Lightning Arrester.

In daily operation, check the contamination of the surface of the porcelain sleeve of Lightning Arrester. Because when the surface of the porcelain sleeve is heavily contaminated, the voltage distribution will be very uneven. In the parallel resistor Lightning Arrester, when the voltage distribution of one of the components increases, the current through its parallel resistor increases significantly, which may burn out the parallel resistor and cause misoperation. In addition, it may affect the arc extinguishing performance of the valve-type Lightning Arrester. Therefore, when the surface of the Lightning Arrester porcelain sleeve is seriously polluted, it must be cleaned in time.

Check Lightning Arrester's lead and ground down conductor, there are burn marks and broken strands, and whether the discharge recorder has burned through this inspection, it is the easiest to find the invisible defects of Lightning Arrester.

Check whether the sealing of the upper lead of Lightning Arrester is good. Poor sealing of Lightning Arrester will cause water and moisture to cause accidents. Therefore, it is necessary to check whether the cement joint between the porcelain sleeve and the flange is tight, and a waterproof cover can be installed on the lead wire of the 10 kV valve-type arrester to prevent rainwater from infiltrating.

Check whether the electrical distance between Lightning Arrester and the protected electrical equipment meets the requirements. The Lightning Arrester should be as close as possible to the protected electrical equipment. After the thunderstorm, Lightning Arrester should check the movement of the recorder. In addition, check the leakage current. When the power frequency discharge voltage is greater than or less than the standard value, maintenance and testing should be carried out. If the discharge recorder runs too many times, it should be overhauled. If there are cracks in the connection between the porcelain sleeve and the cement and the flange and rubber gasket fall off, repair it.

The insulation resistance of Lightning Arrester should be checked regularly. When measuring, use a 2500 volt insulated vibration table. When it is lower than the qualified value, a characteristic test shall be carried out.

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