Abstract
In gas insulation switch (GIS) substation, secondary devices such as line monitoring devices are placed in the switching field, and these electronic devices are vulnerable to transient electromagnetic interference caused by switching operation. In order to facilitate the measurement and research of electromagnetic disturbance data under different working conditions, a simulation test device is developed in this paper, which can be used to simulate electromagnetic disturbance of GIS substation sensor and secondary device port under switch operation. A four-channel parallel gas switch was designed, and the main characteristic parameters of electromagnetic disturbance generated by the simulation device were measured by using high-frequency pulse power supply as the excitation source. The comparison between the measured waveform and the measured disturbance characteristic parameters of GIS substation shows that it is in good agreement with the measured waveform characteristics, conforms to the basic characteristics of damped oscillation wave, and can be used in the secondary equipment port disturbance voltage coupling characteristics, protection measures evaluation and assessment method research.
Highlights
gas insulation switch (GIS) substation switch, contact gap occurs breakdown discharge breakdown or heavy, produce the abrupt change of travelling wave to spread, wave impedance changes happening in catadioptric, form the very fast transient overvoltage and fast transient current, pose a threat to equipment insulation, by conduction, radiation and other coupling method in transient electromagnetic disturbance secondary device ports [4,5]
4 Conclusion A device to simulate the operation environment of GIS switch transient radiation field was developed, and the disturbance voltage tests of secondary devices such as line monitoring devices caused by simulated switch operation were carried out
The four-channel parallel gas switch can realize the occurrence of multiple electric field pulses and control the pulse interval value by controlling the four channels to conduct in turn
Summary
Gas insulated metal-enclosed switchgear has high reliability, strong security, little affected by the external environment factor and maintenance convenient maintenance, compact structure, cover an area of an area small, short installation period, flexible configuration, and the advantages of strong scalability, especially suitable for field congested areas of big cities and substation, underground transformer substation, as well as the rugged mountains of hydropower station [1]. The basin insulator is a key component of GIS, which is composed of metal insert, epoxy insulation and metal flange ring. It has the functions of electrical insulation, isolation gas chamber and. Mechanical and thermal conductivity properties are directly related to the safe operation of GIS. GIS substation switch (including isolating switch and circuit breaker), contact gap occurs breakdown discharge breakdown or heavy, produce the abrupt change of travelling wave to spread, wave impedance changes happening in catadioptric, form the very fast transient overvoltage and fast transient current, pose a threat to equipment insulation, by conduction, radiation and other coupling method in transient electromagnetic disturbance secondary device ports [4,5]. Transient disturbance has the characteristics of short rise time of waveform, large steepness of wave-front, wide frequency range and continuous multiple pulses, etc., which is easy to cause interference to relay protection, control, monitoring and measurement signals of GIS substation [6–8]
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