A method of measuring the ability to resist surge current impact

Abstract

The invention discloses a method and a device of testing surge current impact resistant property of a fuse and can be used for testing the surge current impact resistant property and a fusing characteristic. The technical scheme is that the device of testing the surge current impact resistant property of the fuse comprises a tested fuse, a monitoring portion, a current-limiting resistance, an electronic load and a power source. The device of testing the surge current impact resistant property of the fuse is characterized in that the monitoring portion comprises a monitoring oscilloscope and a sampling resistance. The sampling resistance is connected with the tested fuse, the current-limiting resistance, the electronic load and the power source in sequence to form a closed loop. The monitoring oscilloscope is parallel connection with two ends of the sampling resistance. The power source is a storage battery set, wherein the storage battery is connected in parallel. The electronic load is used for producing periodic surge pulses. The monitoring oscilloscope can monitor resistance variation and fusing time of the tested fuse when the sampling resistance produces corresponding current pulses.

Description

technical field [0001] The invention is used for testing the current impact capability and fusing characteristics of the fuse, and is specifically a method for measuring the anti-surge current impact capability. Background technique [0002] In inductive and capacitive circuits, when the circuit is turned on, there will be an instantaneous surge current, and the fuse of the fuse will have a mechanical impact effect of thermal expansion and contraction when it is impacted by the surge. The first surge impact will cause cracks in the cross section of the fuse, or even directly break the fuse, making the fuse invalid. The invention provides a surge pulse generating device, which can simulate the surge current impact that a fuse may receive when it is used, test the fusing reliability of the fuse, quantify the fusing characteristic parameters of the fuse, and enable the fuse user to further grasp the characteristics of the fuse . [0003] In order to grasp the potential qualit...

AI Technical Summary

Problems solved by technology

The actual use of this test device is very limited

The main disadvantages are: (1) There is a switching pulse current in the output. The constant current power supply used by the power supply is to obtain a constant DC current through rectification, filtering, and steady flow of the mains. There must be a switching pulse current with a relatively large peak current. , this switching current can reach several times the normal output current. Although the time is only tens or hundreds of microseconds, it is enough to have an additional impact on the fuse, and even directly break the fuse core.

from Figure 5 It can be seen that the establishment time of the overload current reaches 2ms, which is obviously not suitable for the test where the 600% fusing time is only a few hundred milliseconds

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