Transformer tester based on programmable constant current source

A program-controlled constant current source and transformer technology, which is applied in the direction of instruments, measuring electricity, measuring devices, etc., can solve the problems of unreasonable structural design, slow current adjustment speed, low detection current accuracy, etc., to achieve fast response speed and ensure normal operation. work, the effect of high current accuracy

Active Publication Date: 2016-11-16
WENZHOU UNIVERSITY +1
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  • Description
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Problems solved by technology

[0003] The existing transformer testing machine has unreasonable structural design, low

Method used

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  • Transformer tester based on programmable constant current source
  • Transformer tester based on programmable constant current source
  • Transformer tester based on programmable constant current source

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Embodiment Construction

[0036] See attached figure 1 to attach Figure 5 , a transformer testing machine based on a program-controlled constant current source disclosed in the present invention includes a frame 1, a detection device arranged on the frame 1, an AC program-controlled constant current source system, and a host computer. The signal sampling controller for measuring the test signal of the transformer S and the load circuit for detection, the signal sampling controller and the upper computer are connected by communication, and the load circuit for detection is provided with a transformer loading fixture for wearing the transformer. The loading fixture includes a strip-shaped conductive plate 2 connected in series in the load circuit for detection, the two ends of the strip-shaped conductive plate 2 are electrical connection terminals 22, and the middle part of the strip-shaped conductive plate 2 is a transformer loading section 21 covered with an insulating layer; The transformer loading ...

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Abstract

The invention relates to a transformer tester based on a programmable constant current source. A transformer loading clamp comprises a strip-shaped conductive plate serially connected in a load circuit; and two ends of the strip-shaped conductive plate are electrical connection ends, and the middle part is a transformer loading section coated with an insulated layer. The programmable AC constant current source comprises a constant current source circuit module and a current feedback circuit module, wherein the constant current source circuit module completes AC-DC-AC conversion, through carrying out pulse width control on a DC-AC full-bridge inverter circuit, high-voltage small current is acquired, the high-voltage small current outputted by the constant current source circuit module is subjected to voltage reduction and current boosting via a current boosting transformer to be supplied to a load circuit; the duty cycle D of a pulse width modulation driving signal outputted by a single chip microcomputer control unit to the DC-AC full-bridge inverter circuit is controlled to be 20% to 80%; and the current feedback circuit module is used for detecting the magnitude of the current of the load circuit. The transformer tester based on the programmable constant current source has the advantages of fast response speed, high precision and high detection efficiency.

Description

technical field [0001] The invention relates to electrical testing equipment, specifically a transformer testing machine for testing intelligent circuit breakers and the like. Background technique [0002] In the production process of intelligent circuit breakers in low-voltage electrical appliances, it is necessary to pass a constant power frequency alternating current (50Hz in China) to test the transformers used in them. Due to the large protection current range of intelligent circuit breakers and many models , so the test current range required for transformer testing is wide, from a few amperes to thousands of amperes [0003] The existing transformer testing machine has problems such as unreasonable structural design, low detection current accuracy, slow current adjustment speed, and low detection efficiency. Contents of the invention [0004] Purpose of the invention: In order to overcome the defects in the prior art, the invention provides a transformer testing ma...

Claims

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Application Information

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IPC IPC(8): G01R35/02G01R1/28G01R1/04
CPCG01R1/0425G01R1/28G01R35/02
Inventor 许海波吴自然吴桂初梁步猛赵升
Owner WENZHOU UNIVERSITY
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