Method and device of testing surge current impact resistant property of fuse

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 specifically is a device and method for testing the surge current impact resistance of the fuse. Background technique [0002] In the inductive and capacitive circuit, the circuit will generate an instantaneous surge current when the circuit is turned on. When the fuse of the fuse is impacted by the surge, it will produce a mechanical shock effect of thermal expansion and contraction. In extreme cases, it will be more continuous. The secondary surge impact will cause cracks in the fuse section, or even directly break the fuse, causing the fuse to fail. The invention provides a surge pulse generator, which simulates the surge current impact that the fuse may be subjected to when in use, tests the fuse reliability, quantifies the fuse fusing characteristic parameters, and enables the user of the fuse to further grasp the characteristics of the fuse . ...

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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