100kA lightning current generator for testing impulse characteristics of grounding device

Abstract

The invention discloses a 100kA lightning current generator for testing the impulse characteristics of a grounding device. The 100kA lightning current generator is characterized by comprising a generator, a direct-current charger and a surge generator body; an output end of the generator is connected with an input end of the direct-current charger, and an output end of the direct-current charger is connected with an input end of the surge generator body. The 100kA lightning current generator is a lightning current generator which can output a highest voltage of 1200kV, a lightning current peak of 100kA and a waveform of 8 / 20 microseconds or 2 / 1microseconds under the condition of a load greater than 5 omega. The 100kA lightning current generator can be applied to the testing of surge impedance of the grounding device, the research of a soil spark discharge phenomenon, high-current withstanding impulse experiments of grounding materials, electromagnetic compatibility experiments and other aspects, and can increase the precision and accuracy of the technical application.

Description

technical field [0001] The invention belongs to the field of power system grounding technology, in particular to a 100kA lightning current generator used for testing the impact characteristics of a grounding device. Background technique [0002] The power system has various forms of grounding requirements such as work, lightning protection, and safety. They are an indispensable and important part to ensure the safe and stable operation of the power system. With the realization of the national networking strategy of west-to-east power transmission and north-south mutual supply, my country's electric power industry will maintain rapid growth in the next 15 to 20 years, and a large number of 330kV, 500kV, 750kV and 1000kV super (extra) high voltage substations and towers will need to be built At the same time, in order to ensure the safety of staff and electrical equipment during the operation of the power grid, it is necessary to build a large number of grounding facilities spe...

AI Technical Summary

Problems solved by technology

Analyzing the current status of the current impulse grounding test, there are mainly the following deficiencies: (1) The peak value of the impulse current acting on the grounding device in the true type test is smaller than the peak value of the actual monitoring lightning current, resulting in a lack of authenticity in the simulation of the spark effect; (2) ) There are still differences between the distribution of impulse current in the grounding device and its surrounding soil and the radial flow distribution of real lightning current

Experimental research can more comprehensively reflect the response of the grounding device under the action of impulse current and its objective law, and can provide basic data consistent with the real situation for the design and transformation of grounding engineering. The development level of the circuit has restricted the in-depth study of the impact characteristics of the grounding device to a certain extent, and it is urgent to develop a high-impact high-current test system with higher technical parameters to meet the research needs of this area.

Images