Large-scale power transformer residual magnetism detection method

A technology for power transformers and detection methods, which is applied to magnetic performance measurement, circuits, magnetic objects, etc., can solve the problems of inability to demagnetize, poor detection accuracy and effect, and poor versatility, and achieves good detection accuracy and effect. Universal good effect

Active Publication Date: 2015-08-12
STATE GRID SICHUAN ELECTRIC POWER CORP ELECTRIC POWER RES INST +2
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Problems solved by technology

[0015] The invention provides a large-scale power transformer residual magnetism detection method, which solves the problem that the existing transformer residual magnetism detection method can only be detected under certain specific circumstances, has poor versatility, and poor detection accuracy and effect , and the technical problem that degaussing cannot be performed, the transformer remanence detection method of the present application has better versatility, better detection accuracy and effect, and can perform demagnetization.

Method used

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  • Large-scale power transformer residual magnetism detection method
  • Large-scale power transformer residual magnetism detection method
  • Large-scale power transformer residual magnetism detection method

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Embodiment 1

[0040] In the first embodiment, a large-scale power transformer residual magnetism detection method is provided, please refer to Figure 1-Figure 3 , the method includes:

[0041] Step 1: Add the first positive DC voltage at both ends of the neutral point and the high voltage side of the transformer, and use high-speed test components to test the charging rising waveform of the DC current. When the current reaches the first preset value, stop powering up and record the charging voltage. Voltage time T1, and connected to the discharge circuit, and continue to monitor the discharge current waveform until the discharge current is zero;

[0042] Step 2: Adding a first negative DC voltage at both ends of the neutral point and the high voltage side, wherein the values ​​of the first positive DC voltage and the first negative DC voltage are equal, and using the high-speed test Components, test the rising waveform of DC current charging, when the current reaches the second preset val...

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Abstract

The invention discloses a large-scale power transformer residual magnetism detection method. Comparison between curves of forward and reverse charging currents of a transformer is utilized to detect residual magnetism, whether there is residual magnetism is judged, and when a charging current is about 100 mA, the transformer without the residual magnetism is little affected; and after a forward and reverse charging test, current wave forms influenced by the residual magnetism is relatively visually represented, and whether there is residual magnetism is relatively visually represented. The transformer residual magnetism detection method has the technical effects that the universality is relatively good, the detection accuracy and effect are relatively good, and demagnetization is available.

Description

technical field [0001] The invention relates to the field of transformer safety design research, in particular to a large-scale power transformer residual magnetism detection method. Background technique [0002] Remanence: Definition in the magnetic material industry: The permanent magnet is magnetized to technical saturation and the surface field Br retained after the external magnetic field is removed is called the residual magnetic induction. It is referred to as remanence, expressed in Br, and the unit is mT (KG) millitesla. KG is the electromagnetic unit system, read as kilogauss. Conversion relationship 1T=10000GS. [0003] Hysteresis loop: In the magnetic field, the relationship between the magnetic induction intensity of the ferromagnet and the magnetic field intensity can be represented by a curve. When the magnetizing magnetic field changes periodically, the relationship between the magnetic induction intensity and the magnetic field intensity in the ferromagnet...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R33/12H01F13/00
Inventor 陈凌李英锋刘睿夏春
Owner STATE GRID SICHUAN ELECTRIC POWER CORP ELECTRIC POWER RES INST
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