1) Lightning arrester

 

That is, when the overvoltage limiter appears, the voltage between the two terminals of the arrester does not exceed the specified value, so that the electrical equipment is protected from overvoltage damage; after the overvoltage, the system can quickly return to the normal state.

 

 

2)The rated voltage of the arrester

 

It is the maximum allowable power frequency voltage applied to the terminals of the arrester. The arrester designed according to this voltage can work correctly under the specified over-voltage in the specified action load test. It is an important parameter indicating the operating characteristics of the arrester. But it is not equal to the system rated voltage.

 

 

2.The difference btween the surge protector and the arrester

 

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

 

The rated voltage of the arrester is from 3kV to 1000kV and the low voltage is 0.28kV to 0.5KV.

 

The rated voltage of the surge protector is <1.2KV, 380220~10V~5V.

 

 

2) Different protection objects

 

Surge arresters protect electrical equipment, while surge protectors generally protect secondary signal loops or end supply circuits such as electronic instrumentation.

 

 

3)Insulation level or pressure level is different

 

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.

 

As shown in Figure 4, the installation location is different

 

The arrester is generally installed on the primary system to prevent the direct intrusion of lightning waves and protect the overhead lines and electrical equipment. The surge protector is installed on the secondary system, after the lightning arrester eliminates the direct intrusion of lightning waves, or the arrester does not. Additional measures to eliminate lightning waves; therefore, the arrester is installed at the incoming line; the surge protector is installed at the end outlet or signal circuit.

 

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 the surge protector needs lightning overvoltage and operating overvoltage. Protection, but its flow capacity is generally small. (The surge protector 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 surge protector with a small flow capacity can fully To the protection effect, the flow value is not important, the important thing is the residual pressure.)

 

 

6) the surge protector is suitable for the fine protection of the low voltage power supply system.

 

The surge protector has a large distance from the front-end surge protector, so that the circuit is prone to oscillating overvoltage or other overvoltage. Power surge protection for terminal equipment, combined with the pre-stage surge protector, the protection effect is better.

 

 

7) 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, the classification protection (IEC61312) is different, and the design is better than the ordinary defense. The lightning device is much more sophisticated.

 

As shown in Fig. 8, from the technical point of view, the arrester can not reach the level of the surge protector in response time, pressure limiting effect, comprehensive protection effect, anti-aging characteristics and the like.

 

 

3. the test standards and requirements, the difference is very big

 

Because the lightning arrester is connected to the electrical primary system, it must have sufficient external insulation performance and the appearance size is relatively large. The surge protector can be made in small size due to the low voltage. For example, from the appearance volume, the arrester is mainly made of silicone rubber. , ceramics, tin cans, bulky, surge protectors with a small amount of silica gel, epoxy, plastic casing, metal and ceramic, metal and plastic.

 

 

4. the place of use

 

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

For more news and events on surge protective device, please pay attention to our official website:www.fatech-surge-protection.com.

FATECH ELECTRONIC LTD.

March.04,2019