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Wind power-main force for carbon neutrality
Nov 11 , 2021
Wind power is the main energy source for constructing a new power system. It is the main force that supports the power system to take the lead in decarbonization, and then promotes the energy system and the whole society to achieve carbon neutrality. The large-scale and high-quality development of the wind power industry is an important strategic choice for implementing the dual-carbon...
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Basic knowledge about grouding
Nov 23 , 2021
When a lightning wave hits a tower or lightning conductor, most of the lightning current will flow into the ground through the grounding device. If the grounding resistance is too high, the lightning current will generate a very high voltage on the top of the tower, causing the insulator to flash over and cause the line to trip. In recent years, power outages caused by lightning strikes have...
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Thunder and lightning
Nov 25 , 2021
As we all know, when the charge in a thunderstorm cloud reaches a certain amount, a strong electric field is formed between different parts of the cloud or between the cloud and the ground. When the charge accumulates to a certain degree,discharge occurs between the cloud and the cloud or between the cloud and the ground. The occurrence of thunder and lightning comes from the acc...
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Grounding resistance of lightning protection for urban rail transit
Dec 02 , 2021
In order to formulate relevant standards for the lightning protection grounding resistance of urban rail transit, it is necessary to further carry out actual measurement research on the grounding resistance of urban rail transit lines, count more test samples, deepen theoretical analysis, and summarize the test methods and test limits requirements for urban rail transit. W...
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Low-voltage surge protectors was approved by IEC
Dec 07 , 2021
At the 2021 annual meeting of the International Electrotechnical Commission IEC/SC37A "Low-Voltage Surge Protector (SPD)" held a few days ago, my country’s first international standard proposal in the field of IEC low-voltage surge protectors was approved. The standard name and series number is: IEC TS 61643-05“Low voltage surge protective devices-Part 05: Monitoring device of Surge protecti...
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Lightning protection to Railway Power Lines
Dec 09 , 2021
To the railway power transmission lines, they are narrow and long, with long distance power supply,bad environment, and frequent accidents, especially in mountainous areas, jungles and river networks, and inconvenient traffic. Once the line fails, it is very difficult to find the fault point and maintain, with high labor intensity and long time to restore power sup...
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SPD backup protector
Dec 15 , 2021
As fuses and circuit breakers show insufficient surge current withstand capability when used in conjunction with SPD, it is necessary to improve the surge current withstand capability. Analyzing the influence of circuit breakers with different rated currents on the breaking capacity of the SSD power frequency short-circuit circuit, to summarize the selection points and coordination suggesti...
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Brief introduction to MOV of SPD
Dec 21 , 2021
Metal oxide varistor (MOV) is a semiconductor element with a unique grain boundary structure. Its resistance value decreases sharply with the increase of voltage. It has excellent nonlinear volt-ampere characteristics, as well as high current capacity, the lower residual voltage, no freewheeling and lower cost. That’s why mov has been the first choice to be used in power and signal ports as over-v...
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