Testing method and device used in direct current short circuit test of surge protective device
A surge protector, DC short-circuit technology, applied in the field of electrical engineering, can solve the problem of no DC short-circuit current test, etc., and achieve the effect of beautiful and friendly operation interface, simple and reliable control
Active Publication Date: 2014-02-26
WUHAN UNIV
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Problems solved by technology
The SPD DC short-circuit current test is an important test to assess the SPD overcurrent protection device and its own safety performance. At present, the SPD used in the DC system has not proposed a DC short-circuit current test and formulated related inspection standards.
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[0051] The device of the present invention will be further described below in conjunction with the embodiment shown in the accompanying drawings:
[0052] The present invention adopts modular design, see figure 2 , the working principle is to select the corresponding test conditions for the test through the intelligent control module (1). When starting the test, make the high-power DC test power supply (2) electrified, and control the voltage output of the high-power DC test power supply (2) through the intelligent control module (1) according to the different test methods specified in each condition, and the high-power variable The resistance value of the resistance box (4) is to meet the expected short-circuit current value set by the output, and the test product in the test sample box (5) is tested.
[0053] image 3 It is the wiring diagram of the high-power DC test power supply. The switching of the high-power DC test power supply is controlled through the high-power c...
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The invention discloses a testing method and a testing device used in a direct current short circuit test of a surge protective device (SPD). By the invention, the direct current short circuit test on the surge protective device can be performed under different conditions and the direct current short circuit performance of the surge protective device can be determined. The device comprises an intelligent control module, a high-power direct current test power supply, a high-power variable resistance box and a sample box, wherein the high-power variable resistance box is in signal communication with the high-power direct current test power supply and the sample box respectively; and the intelligent control module is in control connection with the high-power direct current test power supply, the high-power variable resistance box and the sample box respectively. The invention has advantages that: the method is comprehensively practicable, the device is simple in structure, the test is safe and reliable and the like, so that the invention can be widely applied to a solar power direct current system and an alternating current (AC) / direct current (DC) system.
Description
technical field [0001] The invention belongs to the technical field of electrical engineering, and in particular relates to a method and device for testing and inspecting a DC short-circuit current of a surge protector (SPD). Background technique [0002] In recent years, my country has vigorously developed clean energy. As one of the cleanest energy sources, solar power has developed rapidly. DC SPDs are widely used in solar photovoltaic power generation systems. In addition, the number and voltage level of DC SPDs used in AC conversion DC systems And more and more. In order to prevent the DC system SPD from failing and damaging the DC short-circuit current or overload current flowing through the DC SPD in low-resistance mode, which may cause fire and system short-circuit accidents, it is urgent to develop and research the corresponding DC system surge protector DC short-circuit test inspection method and device. The SPD DC short-circuit current test is an important test to...
Claims
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IPC IPC(8): G01R31/00
Inventor 王建国蔡力李卫国代盛熙薛健岳浩
Owner WUHAN UNIV