Device for failure analysis of surge protector lightning protection component
A technology of surge protector and failure analysis, which is applied in the direction of testing circuit, testing dielectric strength, and conversion equipment with intermediate conversion to AC, etc. It can solve the problems of difficult control of current stability, inaccurate test results, and bulky equipment, etc. , to achieve the effect of saving volume and weight, reducing cost and improving safety
Inactive Publication Date: 2009-06-10
STATE GRID CORP OF CHINA +2
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Problems solved by technology
[0015] The purpose of the present invention is to provide a device for failure analysis of lightning protection devices of surge protectors, which overcomes the difficulty in controlling the stability of the current in existing test equipment, inaccurate test results when the current is small, the need for extra-large power current resistance, and heavy equipment , inconvenient operation, etc. It has the advantages of simple operation, accurate and fast current control, and can be used for SPD testing of various voltage levels, and is small in size and light in weight. The current characteristics in actual use are basically the same
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[0036] Various preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.
[0037] A device for failure analysis of lightning protection devices of surge protectors according to the present invention, the main idea is to apply modern control technology and power electronic technology to generate a high voltage of AC 50HZ with a current control range, and at the same time adjust the range of the voltage in real time to make the current flow The current through the SPD is maintained at the set current to test the protection characteristics of the SPD under different leakage currents.
[0038] like image 3 As shown, the device for failure analysis of the lightning protection device of the surge protector of the present invention includes the following parts:
[0039] A rectification and filtering circuit A, its function is to rectify and filter the input three-phase AC mains power into a DC voltage, which is i...
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The invention relates to a device for analyzing the failure of anti-thunder device of surge protector, wherein it comprises: a rectifier filter circuit, a DC / DC converter, a DC / AC converter for converting the direct voltage of DC / DC converter into alternative voltage at preset frequency, a current limiter serially connected in the circuit between DC / DC converter and DC / AC converter, a current sampler serially connected in the circuit between DC / DC converter and DC / AC converter for converting the current of surge protector into voltage signal, and a current amplifier for amplifying the sampled current signal, to be sent to the DC / DC converter to keep the current of surge protector. The invention uses advanced closed control technique, to real-time adjust the current of SPD, to reduce the cost and improve the testing accuracy.
Description
technical field [0001] The invention relates to a device in the technical field of lightning protection, more specifically, to a device for failure analysis of SPD lightning protection devices of surge protectors such as lightning protectors, varistors, and discharge tubes. Background technique [0002] Lightning strike is a natural phenomenon. Dangerous overvoltage may occur within the range of 1.5-2KM from the center of the lightning strike and damage the equipment on the line. Especially in recent years, with the development of information construction represented by the network, a large number of Information equipment and compact instruments are widely used. These high-precision equipment use a large number of CMOS semiconductor circuits, which are extremely vulnerable to overvoltage and overcurrent protection. Therefore, lightning protection is very important. [0003] At present, most of the lightning protection inside the equipment is realized by SPD, which can be use...
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IPC IPC(8): G01R31/14H02M5/44H02M3/28H02M7/48
Inventor 郭宇
Owner STATE GRID CORP OF CHINA