Intelligent fuse test system

Abstract

The invention relates to an intelligent fuse test system. The intelligent fuse test system includes a test and control center module, a time-current device module and a high-pressure jet fuse module; the test and control center module includes a computer, a printer and a USB-RS485 converter; the time-current device module includes a constant current source, a current detection device, a hardware timer and a current transformer; and the high-pressure jet fuse module comprises a high-pressure jet fuse holder, a contactor, a bracket and a current line, wherein current line is used for replacing a fuse in the high-pressure jet fuse holder so as to simulate the fusing state of the fuse when the contactor is switched off under control. When current exists in the system, the current detection device detects the current, the timer is triggered to carry out timing through a line 1; and after the fuse is fused, the current detection device cannot detect the current, the timer is triggered to stop timing through a line 2. The intelligent fuse test system of the present invention is not affected by the magnitude and fluctuation of the current and is simple and reliable. With the intelligent fuse test system adopted, time from a time point when test current is loaded to the fuse to a time point when the fuse is fused can be obtained accurately, and whether the fuse is qualified is judged.

Description

technical field [0001] The invention relates to the technical field of fuse testing, in particular to an intelligent fuse testing system. Background technique [0002] A large number of high-voltage injection fuses (drop switches) are configured in the power system. Whether the fuse parameters meet the design and manufacturing requirements determines the reliability of the power system operation. In order to ensure the safe operation of the power grid, the user must check the time-current characteristics of the fuse. [0003] In the prior art, a microcomputer protection tester is usually used for fuse testing, and the relay protection tester cannot output a large current, and the cost is expensive; however, the scheme of a voltage regulator and a current booster takes a long time to increase the current to the experimental value, and cannot Fuses with short blowing times are tested and have low current accuracy. In addition, multi-level output current is required, and mult...

AI Technical Summary

Problems solved by technology

[0003] In the prior art, a microcomputer protection tester is usually used for fuse testing, and the relay protection tester cannot output a large current, and the cost is expensive; however, the scheme of a voltage regulator and a current booster takes a long time to increase the current to the experimental value, and cannot Testing of fuses with short blowing times and low current accuracy

In addition, multi-level output current is required, and multiple CTs are used for multi-range measurement, and there is a hidden danger of CT open circuit; during the process of rising current, the fuse is loaded in advance to cause heat accumulation, which affects the test results, and intelligent measurement control cannot be performed.

Images