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Impulse response analytical test apparatus and method for detecting deformation of transformer winding

A technology of transformer winding and impulse response, which is applied in the direction of measuring devices, measuring electrical variables, instruments, etc.

Inactive Publication Date: 2010-05-05
CHONGQING UNIV
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Problems solved by technology

[0005] The purpose of the present invention is to provide a pulse high-frequency testing device and method for detecting slight deformation of transformer windings in view of the deficiencies of the existing transformer winding deformation detection device and method, which has high detection sensitivity, good anti-interference ability, fast test speed, etc. advantage

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  • Impulse response analytical test apparatus and method for detecting deformation of transformer winding
  • Impulse response analytical test apparatus and method for detecting deformation of transformer winding
  • Impulse response analytical test apparatus and method for detecting deformation of transformer winding

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Embodiment 1

[0046] Such as figure 1 As shown, an impulse response analysis test device for detecting transformer winding deformation mainly includes a pulse generator 1, a broadband digital oscilloscope 6, a high-voltage probe 5, a computer 7, a first-end signal impedance matcher 3, an end signal impedance matcher 4, Coaxial shielded cable 2.

[0047] Pulse generator 1 is a commercially available EFT-2003 group pulse generator, which instantly generates a repetitive exponential pulse voltage with an adjustable amplitude of 200~4500V, an adjustable repetition frequency of 100Hz~1MHz, a rising edge of 5ns, and a half pulse width of 50ns wave. The pulse generator 1 is connected to the head-end signal impedance matcher 3 through a coaxial shielded cable 2. The head-end signal impedance matcher 3 is connected to one end of the tested winding of the tested transformer 8 through a voltage clamp on it, and is connected to the end signal impedance matcher 4 through a coaxial shielded cable 2. The t...

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Abstract

The invention relates to impulse response analytical test apparatus and method for detecting deformation of transformer winding, belonging to the technical field of transformer winding detection. The apparatus mainly comprises an impulse generator, a broadband digital oscilloscope, a computer, a high-voltage probe, a head end signal impedance matching device, a tail end signal impedance matching device and a screened coaxial cable. In the method, site test and analysis are carried out by using the apparatus. The invention has the advantages of high test sensitivity, rapid detection, strong capacity of resisting disturbance and flexible analytical method, and can detect slight deformation of the transformer winding and judge early potential faults effectively with high judging accuracy. The invention can be widely applied to the detection of the deformation of the transformer winding and the state overhauling.

Description

Technical field [0001] The invention belongs to the technical field of transformer winding detection, and specifically relates to a detection device and method for transformer winding deformation. Background technique [0002] Transformer is the main electrical equipment in the power system, and its normal operation is of great significance to the safe production and reliability of the power system. Transformers will inevitably suffer various short-circuit faults during operation. The transformer windings will withstand the huge and uneven electrodynamic force generated by the short-circuit current, which will lead to distortions, bulging or displacement of the windings. According to statistics, about 1 / 4 of transformer faults are caused by winding deformation. With the development of power system relay protection technology and devices, the short-circuit current that the transformer bears and its duration are greatly limited. The deformation of the transformer winding caused b...

Claims

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Application Information

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IPC IPC(8): G01R31/06G01R1/20
Inventor 李剑杜林廖瑞金王有元陈伟根唐炬张晓星夏珩轶
Owner CHONGQING UNIV
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