System and method for detecting transformer winding state by using constant-current sweep frequency power source excitation

A technology of transformer windings and swept frequency power supply, which is used in transformer testing, measuring electrical variables, instruments, etc., can solve the problems of many winding conditions, difficult quantitative criteria, and no identification criteria, and achieve the effect of avoiding sudden short circuit

Active Publication Date: 2010-06-16
SHANGHAI MUNICIPAL ELECTRIC POWER CO +1
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Problems solved by technology

[0020] The test sensitivity of the frequency response method is higher than that of the short-circuit impedance method. However, due to the complexity of the frequency response waveform, the judgment of the winding condition requires more experience, and it is difficult to form a clear quantitative criterion. Therefore, no criterion has been formed so far.

Method used

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  • System and method for detecting transformer winding state by using constant-current sweep frequency power source excitation
  • System and method for detecting transformer winding state by using constant-current sweep frequency power source excitation
  • System and method for detecting transformer winding state by using constant-current sweep frequency power source excitation

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specific Embodiment approach

[0061] Such as image 3 As shown, the present invention provides a system for detecting the winding state of a transformer by means of a constant current frequency sweep power supply, which includes:

[0062] Measurement and control analysis module 301;

[0063] An excitation module, the circuit of the excitation module is connected to the measurement, control and analysis module 301;

[0064] A signal acquisition module, the signal acquisition module circuit is connected to the measurement and control analysis module 301 and the excitation module;

[0065] The excitation module includes a controllable constant current frequency sweep power supply 201 and an excitation transformer 202 connected through a circuit;

[0066] Described signal acquisition module comprises the vibration sensor 101 and the vibration signal collector 102 of sequential circuit connection;

[0067] Described vibration sensor 101 adopts DH185 piezoelectric ICP acceleration sensor, and parameters are a...

specific Embodiment

[0139] In a substation, the low-voltage side of phase A of the main transformer suffered a short-circuit impact due to the breakdown of the rheology at the outlet, and the protection of the pressure release device was activated. Later, due to system deployment reasons, it was decided to put it into operation again.

[0140] A power outage detection was carried out before operation. First, the short-circuit impedance method was used for testing. The test found that the short-circuit impedance basically did not change (the change value was less than 0.1%); There was no abnormal change in the measurement curve compared to the control. According to the conclusions of these two electrical measurement methods, it is believed that the A-phase winding coil of the transformer has no deformation fault.

[0141] However, at last, the measurement system of the present invention is used for detection, and the method of frequency sweep to excite the vibration spectrum is used to carry out a...

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Abstract

The invention relates to system and method for detecting the transformer winding state by using constant-current sweep frequency power source excitation. A measurement and control analysis module controls sweep frequency power source and applies output constant-current sweep frequency excitation signals by an exciting transformer at a high-voltage side of the transformer to be detected; a vibration sensor measures vibration response signals of a transformer winding to be detected at different excitation frequencies; a vibration signal collector collects and preprocesses the signals measured by the vibration sensor; and the measurement and control analysis nodule carries out spectrum analysis to the received and processed vibration response signal data, displays and records a resonant frequency curve of the transformer winding on a frequency domain, compares with the resonant frequency curve previously measured and recorded as well as the vibration frequency curve of a transformer three-phase coil, and judges the state of the transformer winding to obtain the measuring result. The invention can effectively and sensitively detect the states of looseness or deformation of the transformer winding for prompt repair or replacement so as to avoid a fault of abrupt short circuit of the transformer caused by damage of the winding structure.

Description

technical field [0001] The invention relates to a system and a method for detecting the winding state of a transformer by using a constant current sweeping power supply to excite vibration. Background technique [0002] The transformer is one of the most important equipment in the power system, and its operation stability has a great influence on the safety of the power system. With the increasing capacity of my country's power grid, the short-circuit capacity is also increasing. The huge electromagnetic force generated by the surge current formed by the short-circuit of the transformer outlet poses a serious threat to the mechanical strength and dynamic stability of the transformer winding. At present, the operating environment of substation equipment and lines is not optimistic. The deformation of transformer winding caused by external short circuit is a relatively common fault in the process of transformer operation, which poses a great threat to the safe operation of the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/06G01R31/00
CPCG01R31/027G01R31/62
Inventor 姜益民金之俭朱子述饶柱石傅坚
Owner SHANGHAI MUNICIPAL ELECTRIC POWER CO
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