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Test system and method for magnetic property of after-current actuating protector magnetic core

A technology of residual current and testing system, which is applied in the direction of magnetic performance measurement, instrumentation, measuring electricity, etc., can solve problems such as difficult to meet the requirements of fast and accurate magnetic core testing, and achieve the effect of correcting test errors and ensuring accuracy

Inactive Publication Date: 2008-07-16
ADVANCED TECHNOLOGY & MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there is still a lack of a clear standard in this testing field in China, and the existing magnetic core leakage current tester is gradually difficult to meet the requirements of fast and accurate magnetic core testing in production

Method used

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  • Test system and method for magnetic property of after-current actuating protector magnetic core
  • Test system and method for magnetic property of after-current actuating protector magnetic core
  • Test system and method for magnetic property of after-current actuating protector magnetic core

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051]Take a 23-14-18mm magnetic core, the number of turns of the primary coil: the number of turns of the secondary coil = 1:1, apply a 50Hz positive half-wave current to the primary coil, and the effective value of the current is 40mA, and the induced voltage on the secondary coil The average waveform is fed back to the computer, the average induced voltage is 4.026mV, and the test time is 0.9s.

Embodiment 2

[0053] Take a 23-14-18mm magnetic core, the number of turns of the primary coil: the number of turns of the secondary coil = 1:1, apply a 50Hz positive full-wave current to the primary coil, and the effective value of the current is 40mA, and the induced voltage on the secondary coil The average waveform is fed back to the computer, the average induced voltage is 4.107mV, and the test takes 1.1s.

Embodiment 3

[0055] Take a 23-14-18mm magnetic core, the number of turns of the primary coil: the number of turns of the secondary coil = 1:1, apply a 50Hz standard sine wave current to the primary coil, the effective value of the current is 40mA, and average the induced voltage on the secondary coil The value waveform is fed back to the computer, the average value of the induced voltage is 5.355mV, and the test time is 1.0s.

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Abstract

The invention discloses a system and a method for testing the magnetic performance of a magnetic core of a residual-current operation protective device and belongs to the technical field of the magnetic performance testing of a magnetic core. The system comprises a computer, an analog-to-digital conversion equipment, a linear power amplifier, a low pass filtering device and an analog signal collecting equipment. The computer is connected with the analog-to-digital conversion equipment through a PCI interface, and the analog-to-digital conversion equipment is connected with the linear power amplifier which is connected with the low-pass filtering device, and a primary signal is loaded into a magnetic core to be tested by the devices; the signal collecting equipment is connected with the computer through the PCI interface, the low-pass filtering device is connected with a signal input end of the signal collecting equipment, and induction voltage signal generated by the magnetic core to be tested which is driven by the primary signal is collected into the computer by the signal collecting equipment through the low-pass filtering device. The invention has the advantages that a tested waveform is closer to a standard waveform and an automatic and continuous testing is supported, and the invention ensures the accuracy and traceability of testing results.

Description

technical field [0001] The invention belongs to the technical field of magnetic performance testing of magnetic cores, in particular to a magnetic performance testing system and method for a magnetic core of a residual current operated protector. Background technique [0002] The residual current operating protector is a circuit protection device made of the principle of zero-sequence current transformer. In the case of direct or indirect leakage in the circuit (such as the nominal differential current I ΔN ≤30mA) has higher safety protection. With the rapid development of electrical and electronic technology, the performance requirements of residual current operated protectors are constantly improving: not only can they work normally under pure AC leakage current, but they can also work normally under zero or close to zero pulsating DC leakage current. Therefore, under various input current waveforms, it is the key to measure the performance of the residual current operate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R33/12G01R31/00
Inventor 冀春来阮芳刘宗滨陈文智骆骁
Owner ADVANCED TECHNOLOGY & MATERIALS CO LTD
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