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A large 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 poor detection accuracy and effect, inability to demagnetize, and poor versatility, and achieve good versatility, detection accuracy and good effect

Active Publication Date: 2017-09-29
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.

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  • A large power transformer residual magnetism detection method
  • A large power transformer residual magnetism detection method
  • A large 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, which uses the comparison of the forward and reverse charging current curves of the transformer to detect the residual magnetism, and judges whether there is residual magnetism, and when the charging current is about 100 milliamperes, no The transformer with residual magnetism will not have a great impact. After the positive and negative charging test, the current waveform that can more vividly represent the influence of residual magnetism can be more intuitively represented whether there is residual magnetism, and the universality of the transformer residual magnetism detection method of this application is realized. Better, the detection accuracy and effect are better, and the technical effect of degaussing can be achieved.

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 Patents(China)
IPC IPC(8): G01R33/12H01F13/00
Inventor 刘勇陈凌李英锋刘睿夏春
Owner STATE GRID SICHUAN ELECTRIC POWER CORP ELECTRIC POWER RES INST
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