The surge protector and arrester

Update date:2018-07-05 Source:MAXGE

Both the arrester and the surge protector have the functions of preventing overvoltage, especially the lightning overvoltage, as the common components used in electrical equipment, but there are still many differences in application.

surge protector

1, the application field can be divided from the voltage level.

The rated voltage of the arrester is <3kV to 1000kV, low voltage 0.28kV, 0.5kV.

The rated voltage of the surge protector is k1.2kV, 380, 220~10V~5V.

2, different protection objects

The arrester protects the electrical equipment, while the SPD surge protector generally protects the secondary signal loop or the end supply circuit for electronic instrumentation.

3. Different insulation level or pressure level

The withstand voltage level of electrical equipment and electronic equipment is not an order of magnitude, and the residual voltage of the overvoltage protection device should match the withstand voltage level of the protected object.

4, the installation location is different

The arrester is generally installed on the primary system to prevent direct intrusion of lightning waves and protect the overhead lines and electrical equipment. The SPD surge protector is installed on the secondary system, after the lightning arrester eliminates the direct intrusion of lightning waves, or the arrester There is no supplementary measure when the lightning wave is removed; therefore, the arrester is installed at the incoming line; the SPD is installed at the end outlet or signal circuit.

surge protector

5, different flow capacity

Because the main function of the arrester is to prevent lightning overvoltage, its relative flow capacity is relatively large. For electronic equipment, the insulation level is much smaller than that of electrical equipment in general, so SPD is required to protect against lightning overvoltage and operating overvoltage. However, its flow capacity is generally small. (SPD is generally at the end and will not be directly connected to the overhead line. After the current limit of the upper stage, the lightning current has been limited to a lower value, so that the SPD with a small flow capacity can fully protect the flow. The value is not important, the important thing is the residual pressure.)

6, other insulation levels, the focus of the parameters, etc. also have large differences.

7. The surge protector is suitable for the fine protection of the low-voltage power supply system. Various AC/DC power supplies can be selected according to different specifications. The power surge protector has a large distance from the front-end surge protector, so that the circuit is prone to oscillating overvoltage or other over-voltage. Fine power surge protection for terminal equipment, combined with the pre-stage surge protector, the protection effect is better.

8, different materials

The main material of the arrester is mostly zinc oxide (one of the metal oxide varistor), and the main material of the surge protector is different according to the anti-surge level and the classification protection (IEC61312), and the design is better than the ordinary defense. The lightning device is much more sophisticated.

9. Technically speaking, the arrester does not reach the level of the surge protector in terms of response time, pressure limiting effect, comprehensive protection effect, and anti-aging characteristics.

surge protector

10. Use place

Lightning arresters are mainly used in power stations, lines, substations, power generation, capacitors, motors, transformers, neutrals, steel, and railways. Surge protectors are mainly used in low-voltage power distribution, cabinets, low-voltage electrical appliances, communications, signals, machine stations, and computer rooms.

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