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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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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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The hazards of electrostatic discharge
Dec 22 , 2021
Electrostatic discharge (ESD) and electrical fast transients (EFT) cause different hazards to instrumentation systems. Electrostatic discharge produces strong radio frequency radiation in the frequency range of 5 to 200 MHz.The peak of this radiated energy often occurs between 35MHz and 45MHz, and self-oscillation occurs. The resonant frequency of many information transmission cables is usually wi...
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“Thunder and Snow”
Dec 23 , 2021
Thunder is common in summer, because the ground temperature is high, and convective clouds are more likely to form when warm and humid air rises, which creates conditions for lightning. In areas with relatively large undulations, thunder and rain are more common. This is because the warm air is blocked by mountains during the horizontal movement to form convection. In winter, the ground temperatur...
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Concept of neutral and grounding
Dec 29 , 2021
Neutral connection: The neutral point of generators and distribution transformers is called the zero point, and the line drawn from the neutral point is called the neutral line. The metal shell of electrical equipment connected to the neutral line is called Neutral connection. Working grounding: The neutral point of the transformer of the power supply system is directly grounded as the w...
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carbon peak and carbon neutrality
Dec 31 , 2021
In the context of carbon neutrality, my country is building a new power system with new energy as the main body. "New energy + energy storage" is considered the direction of the energy revolution. As the most active field of energy storage technology, large-scale electrochemical energy storage is helping the development of new power systems. New energy has the advantages of multi-dimensional obser...
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The difference between wave welding and reflow soldering
Jan 04 , 2022
Wave soldering is a tin bar into a liquid state by tin slots, using a motor to form a peak, allowing the PCB to weld to the part, generally used in the hand-in-in-box soldering and SMT glue plate. Re-flowing welding is mainly used in the SMT industry, which is conducted by hot air or other thermal radiation, melting the solder paste printing on the PCB and welded. Different: Wave weld the flux, an...
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