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The difference between lightning arrester and surge protector!

Time:2018/5/6Author:adminClick: 3608
First, the arrester introduced
1, arrester
That is over-voltage limiter. When overvoltage occurs, 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 is applied, the system can quickly return to normal.
 
2. Rated voltage of arrester
It is the maximum allowable power frequency voltage applied between the terminals of the arrester. The arrester designed according to this voltage can work correctly under the temporary overvoltage in the specified operation load test. It is an important parameter to indicate the operating characteristics of the arrester. However, it is not equal to the system rated voltage.

Second, the difference between surge protector and arrester
1, the application field can be divided from the voltage level.
The rated voltage of the lightning arrester is 3kV to 1000kV and the low voltage is 0.28kV to 0.5kV.
Surge protector rated voltage ≦ 1.2kV, 380, 220 ~ 10V ~ 5V.
 
2, different protection objects
The lightning arrester protects the electrical equipment, and the surge protector generally protects the secondary signal circuit or the electronic equipment instrument and other terminal power supply circuits.
 
3, different insulation levels or pressure levels
The withstand voltage level of electrical equipment and electronic equipment is not one order of magnitude, and the residual voltage of the overvoltage protection device should match the withstand voltage level of the protection object.
 
4, different installation locations
Arresters are generally installed on a system to prevent the direct intrusion of lightning waves to protect overhead lines and electrical equipment. Surge protection devices are often installed on secondary systems. After surge arresters have eliminated the direct intrusion of lightning waves, or the arrester is not The supplemental measures when the lightning wave is eliminated are clean; so the arrester is installed at the incoming line; and the surge protector is usually installed at the terminal outlet or signal loop.
 
5, different flow capacity
Arrester because the main role is to prevent lightning overvoltage, so its relatively large flow capacity; and for electronic equipment, the insulation level is much smaller than the general sense of the electrical equipment, it needs surge protectors for lightning overvoltage and operating overvoltage Protect, but its flow capacity is generally not large. (Surge protectors are generally at the end and will not be directly connected to the overhead lines. After the current limiting function of the upper level, the lightning current has been limited to a lower value, so that the surge protector with small flow capacity can completely For protection, the flow value is not important, but the residual pressure is important.)
 
6. Surge protector is suitable for fine protection of low voltage power supply system.
The surge protector has a large distance from the front surge protector of the terminal device, so that an oscillating overvoltage or other overvoltage is easily generated on the line. The power surge protection applied to the terminal equipment is better when used in conjunction with the surge protector at the front stage.
 
7, different materials
The main material of the lightning arrester is zinc oxide (a kind of metal oxide varistor), and the main material of the surge protector is different according to the anti-surge rating and the classification protection (IEC61312), and the design is better than ordinary protection. The minecraft is much more precise.
 
8. Technically speaking, surge arresters do not reach the level of surge protectors in response time, pressure limiting effect, comprehensive protection effect, and anti-aging characteristics.

Third, test standards and requirements speaking, a great difference
Because the 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 small in size due to the connection to the low pressure. For example, from the appearance volume, the arrester is mainly made of silicone rubber. , ceramics, iron cans, bulky, surge protector with a small amount of silica gel, epoxy bag, plastic shell, metal and ceramics, metal and plastic.

Fourth, use of places
Arrester is mainly used in power stations, lines, power distribution stations, power generation, capacitors, motors, variable piezoelectric devices, neutral points, steelmaking, and railways. Surge protectors are mainly used in low-voltage distribution, cabinets, low-voltage electrical appliances, communications, signals, aircraft stations, and engine rooms.
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