Grounding application of lightning surge generator in substation
The electromagnetic environment in substations, especially ultra-high voltage substations, is very bad. Therefore, the lightning surge generator manufacturers believe that secondary equipment in some substations, especially the electronic and microelectronic equipment, such as microcomputer monitoring, monitoring and relay protection devices, are often affected by various electromagnetic interference and misoperation, misoperation, or even damage.
In recent years, with the development and wide application of new electronic components and large-scale and vlsi, secondary electronic equipment is becoming more and more high-speed, broadband domain and high-density, and its signal level is becoming lower and lower, more sensitive to electromagnetic interference, and more demanding to the external electromagnetic environment. Therefore, it is of great significance to study how to improve the anti-interference level of secondary electronic equipment in substations to ensure the safe and reliable operation of modern power system, accelerate the popularization and application of new electronic and microelectronic equipment in power system, and promote the modernization, automation and intelligent process of ultra-high voltage substations.
Grounding is one of the effective methods to improve electromagnetic compatibility (EMC) of electronic equipment. The correct grounding can not only suppress the influence of electromagnetic interference, but also suppress the interference from the equipment.And the wrong grounding, but will introduce serious interference signals, and even make the secondary electronic equipment can not work properly. Many places of electronic equipment need grounding, different grounding has different purposes and characteristics, different types of secondary equipment have different requirements. The word "earth" in electronic devices usually has two meanings: "earth" and "system reference ground."The purpose of grounding secondary electronic equipment is usually two, one is for safety, that is, to protect the operator from electric shock;The second is to curb distractions.The fundamental reason why grounding can suppress interference lies in the relative stability of ground potential.
Lightning surge generator manufacturers caution that differential mode interference may occur between grounding system grounding points due to the relative potential differences that may occur when grounding points are improperly selected or ground circuits are poorly selected and designed.
Main performance of pulse group generator
Pulse group generator is a special experimental instrument for electronic and electrical equipment, so what kind of function does pulse group generator have? What are its main properties?This chapter we come to the concrete understanding.
Pulse group generator is specially designed according to the characteristics and requirements of electrical and electronic products for electrical fast transient pulse group test. EFT61004A intelligent pulse group generator products fully meet or exceed the requirements of international standard iec61000-4-4 and national standard GB/T17626.4, mainly used to evaluate the ability of electronic and electrical equipment to resist the interference of electrical fast transient pulse group.Whether in appearance, or in the performance indicators, are comparable with similar products abroad electromagnetic compatibility testing equipment.
In addition, pulse group generator also has the following characteristics:
1. Liquid crystal display, intelligent control;
2. Some key components are imported with original packaging, reliable and durable.
3. small size, light equipment, easy to operate;
4. Built-in international standard four-grade parameters;
5. the use of program-controlled high-voltage power supply, easy to set up, good reliability;
6. 1 k Ω waveform output meet 50 Ω and two output impedance waveform;
7. The highest pulse frequency reaches 1200kHz;
8. Can be upgraded to high-current EUT network;
9. Pulse output polarity can be alternately positive and negative;
10. Facilitate future product upgrades.
The pulse group generator should be used together with its corresponding equipment when it is in use, and corresponding measures should be taken in time when interference is received to ensure the accuracy and availability of experimental data.
How should pulse group generator test be configured?
Before the use of pulse group generator, it is necessary to test its performance, so as to ensure the use effect of pulse group generator.Then how to configure the pulse group generator test correctly?
The configuration of pulse group generator test not only needs to pay attention to the configuration of the main board, but also pay attention to the layout relationship among the reference ground plate, instrument and product.Note the following:
Due to the use of the circuit involved, if the layout is not correct, the correct experimental results cannot be obtained, as long as in accordance with the requirements of the specification to achieve accurate results.