1. How to choose the right power surge arrester: When selecting lightning arresters to protect different types of equipment in a region, the following factors should be taken into consideration:
· The probability of occurrence of a thunderstorm intensity Ng and the maximum discharge current in the area P
· The equipment to be protected against impact level · The value of the equipment to be protected (should be determined according to the national economic level)
· The social importance of the protected equipment · Identify the different protection voltage UP and discharge current of the lightning arrester power supply lightning protection device selection - power supply arrester key parameters:
I. The maximum discharge current Imax:
Use 8/20μs wave shock arrester once to withstand the maximum discharge current. According to the local thunderstorm intensity Ng (or average annual thunderstorm day Td) and environmental factors make appropriate choices.
II. Maximum continuous pressure Uc(rms):
It means that the arrester can work continuously under this voltage value without affecting its parameters as a lightning arrester. Uc is nonlinearly proportional to the protection voltage Up.
III. Residual Voltage Ur and Protection Voltage Up:
Residual pressure Ur: Residual pressure at rated discharge current In.
Protection Voltage Up: Protection Voltage Up is related to Uc Voltage and Ur, Ur
According to the zinc oxide varistor characteristics, when the Uc value of the selected varistor is high, the Up and Ur will also increase accordingly, such as when the discharge current is 10kA (8/20μs):
Uc=275VUr(10kA, 8/20μs)≤1200V
Uc=385VUr (10kA, 8/20μs) ≤ 1600V
Uc = 440VUr (10kA, 8/20μs) ≤ 1800V
2. Classification of power surge protectors:
I. Distinguish by discharge current:
Tolerance to 10/350μs wave products: This waveform is a simulated direct-thunder lightning waveform with large waveform energy. Currently, there are air gap type and varistor type products. Such as Tegel's GPU1-25, GPU1-35 series.
Tolerance of 8/20μs Wave Products: This waveform is an analog inductive wave, which is currently used in many waveforms. Common discharge current parameters are 100kA, 80kA, 65kA, 40kA, 20kA, etc., using zinc oxide varistors. Such as Tegel's GPU1-5, GUP1-10, GPU1-20, GPU1-30 series.
II. According to the protection mode:
Monolithic type: users can freely combine and select different types and types of lightning arresters according to the grid connection mode.
Assembled: For the convenience of user wiring, the supplier has already assembled various modules according to different wiring systems. There are commonly used Tegel's GPU1 and DB1 series surge arresters.
Installation method: Commonly used for 35mm rail installation, there are individual companies for screw fixation.
III. According to the shape structure to distinguish:
Modular: Users can freely combine and select different types and types of lightning arresters according to the grid connection mode.
Box type: Place one or two groups of modular arresters in a lightning protection box, suitable for situations where the distribution box or equipment cabinet has insufficient space.
· Single-stage lightning protection box: A group of power surge arresters of the same grade module are installed in a lightning protection box.
· Multi-stage lightning arrester: Two modular surge arresters are placed in a lightning protection cabinet. In order to solve the two-stage lightning protection in a limited space, by connecting the decoupling coils or installing an isolation transformer, it can not only amplify the current, but also limit the residual voltage to 1kV or less. Usually, two single-stages can be used. The lightning protection box has the same effect as a multi-stage lightning protection box. Gabion
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