Simulated electromagnetic disturbance source for isolating switch

Abstract

The invention discloses a simulated electromagnetic disturbance source for an isolating switch. The simulated electromagnetic disturbance source comprises a testing transformer, a capacitive divider, an adjustable grounding capacitor, a power supply side analog capacitor, a vacuum circuit breaker switch, a discharging sphere gap and a load side analog capacitor. The original side of the testing transformer is connected with a power supply, and the auxiliary side is serially connected with the capacitive divider. The power supply side analog capacitor is parallelly connected with the capacitive divider. The anode of the power supply side analog capacitor is successively connected with the vacuum circuit breaker switch, the discharging sphere gap, the load side analog capacitor and a grounding capacitor in series. The cathode of the power supply side analog capacitor is grounded. The simulated electromagnetic disturbance source can truly simulate an electromagnetic disturbance process and a ground potential increase process in a switching-on process and a switching-off process of the isolating switch and can output a 1.1MHz high-strength electromagnetic field. Furthermore the simulated electromagnetic disturbance source for the isolating switch has advantages of convenient assembling, simple operation, high testing safety and high precision.

Description

【Technical field】 [0001] The invention belongs to the technical field of electromagnetic compatibility, and relates to an isolating switch simulating an electromagnetic disturbance source. 【Background technique】 [0002] With the rapid development of the power industry and the continuous improvement of the voltage level of substations, weak current equipment based on microelectronic detection technology and computer control technology is more and more widely used in substations. Electromagnetic compatibility is no longer just a technical issue related to electrical utilization. It has become a social and economic issue of great significance to social security and stability, quality assurance of living environment, etc. [0003] In 2009, President Obama of the United States proposed a development plan for investing in smart grids, and formally included the construction of smart grids as a new energy development strategy into the national economic development plan of the Unite...

AI Technical Summary

Problems solved by technology

At present, the electromagnetic compatibility test has been stipulated in the type test of the electronic transformer, but the existing test standard refers to the secondary equipment standard, and the test content and evaluation standard are quite different from the actual electromagnetic environment of the electronic transformer.

Since it was put into operation in 2000, the electronic current transformers with voltage levels of 110kV and above in the State Grid Corporation's system have been used many times. The main problems are collector failures caused by electromagnetic compatibility, error failures caused by temperature changes, fiber optic failures caused by vibration, and laser power supply failures. etc.; State Grid Corporation of China’s 110kV and above electronic voltage transformers had multiple failures in total, among which insulation and electromagnetic interference caused the highest failure rate, which caused some substations to fail due to electromagnetic compatibility during the switching operation of the isolating switch. The accident that the electronic transformer collector failed and could not be put into operation

The outstanding problems at present are: the electronic transformer has passed the electromagnetic compatibility test according to the standard and the test result is qualified, but it has a high failure rate of electromagnetic protection in the actual use of substations, which will seriously affect the rapid construction and development of smart grids Therefore, it is necessary to test, analyze and study the actual transient electromagnetic environment of the substation to grasp the real electromagnetic environment of the electronic transformer application, improve the electromagnetic compatibility test method and standard, and make the electronic transformer according to the improved electromagnetic compatibility test method. After testing according to the standards and standards, its electromagnetic compatibility meets the requirements of safe and stable operation

[0008] 1) The parameters in the test cannot fully meet the field conditions;

[0009] 2) The test intensity of a single parameter is lower than the intensity of multi-parameter superposition at the same time on site;

[0010] 3) Component-level test results cannot fully reflect system-level test results

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