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A transformer short-circuit fault location detection method and system

A short-circuit fault and location detection technology, which is applied in transformer testing, short-circuit testing, electric/magnetic solid deformation measurement, etc., can solve problems such as inability to locate short-circuit faults, and achieve the effect of preventing power grid accidents

Active Publication Date: 2022-01-21
ELECTRIC POWER RES INST OF GUANGDONG POWER GRID
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention provides a transformer short-circuit fault location detection method and a transformer short-circuit fault location detection system, which solves the technical problem that the short-circuit fault cannot be located when a transformer short-circuit fault occurs

Method used

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  • A transformer short-circuit fault location detection method and system
  • A transformer short-circuit fault location detection method and system
  • A transformer short-circuit fault location detection method and system

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Embodiment 1

[0054] see figure 1 , figure 1 It is a flow chart of a transformer short-circuit fault location and detection method and system provided by an embodiment of the present invention.

[0055] A transformer short-circuit fault location detection method provided by the present invention is suitable for a pre-established transformer short-circuit fault location detection system, and the method includes the following steps:

[0056] Step S1: short-circuit the winding on one side of the normal transformer, and connect the winding on the other side to the transformer short-circuit fault location detection system, use the transformer short-circuit fault location detection system to detect the normal transformer, and measure the short-circuit impedance in a specific frequency band (10hz-1Mhz), Draw the frequency sweep impedance curve of the normal transformer according to the frequency change and impedance value;

[0057] Step S2: Use the transformer short-circuit fault location detect...

Embodiment 2

[0074] This embodiment provides a transformer short-circuit fault location detection system, including a signal generator, a power amplifier, a data acquisition card and a microprocessor, and the microprocessor is respectively connected to the input end of the signal generator and the output end of the data acquisition card The output terminal of the signal generator is connected with the input terminal of the power amplifier.

[0075] Further, the working process of the transformer short-circuit fault location detection system is explained. The signal generator of the transformer short-circuit fault location detection system sends out a sinusoidal signal of 10 Hz to 1 MHz, and the sinusoidal signal is transmitted to the power amplifier. Carry out signal amplification, and apply the amplified signal to the transformer winding, the data acquisition card collects the voltage and current in the transformer winding, and transmits the data of voltage and current to the microprocesso...

Embodiment 3

[0077] In this embodiment, it is specifically described how the transformer winding deformation fault location detection system solves the frequency sweep impedance;

[0078] Short-circuit the outgoing line of the high-voltage side or low-voltage side of the transformer, and load the frequency sweep signal at the first end of the non-short-circuit side winding After the signal passes through the winding, the output signal at the end of the winding is obtained by using the grounding resistor R According to the above data, the frequency sweep impedance value of the transformer can be obtained as:

[0079]

[0080] in To detect the current, ω is the angular frequency of the injected signal; R is the resistance of the transformer; X is the reactance of the transformer.

[0081] Thus, the frequency sweep impedance value can be obtained as:

[0082]

[0083] Since the nameplate value of the transformer is generally represented by impedance voltage, the frequency sweep im...

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Abstract

The invention discloses a transformer short-circuit fault location detection method and system, which are used to solve the technical problem that the transformer fault detection cannot locate the short-circuit fault location. The invention comprises the following steps: using the transformer winding deformation fault location detection system to detect the normal transformer and the transformer to be tested, measuring the frequency-sweeping impedance curves of the normal transformer and the transformer to be tested, comparing the frequency-sweeping impedance curves of the two, and according to the comparison result Determine whether the transformer under test has a short-circuit fault and calculate and analyze the location area where the short-circuit fault occurs in the winding. The invention establishes a transformer short-circuit fault location detection system to connect with the transformer, obtains the frequency-sweeping impedance curve of the transformer to locate the transformer short-circuit fault, and solves the problem that the prior art cannot locate the transformer short-circuit fault. It is of great significance to prevent power grid accidents.

Description

technical field [0001] The invention relates to the technical field of transformer winding deformation detection, in particular to a transformer short-circuit fault location detection method and system. Background technique [0002] Transformer is one of the main equipment of the power system, which plays a pivotal role in grid interconnection and power exchange. Insufficient short-circuit resistance of the transformer itself is the main cause of short-circuit damage to the transformer. In addition, improper operation and management is also a factor that cannot be ignored. The short-circuit resistance of transformers is not enough, which is mainly manifested in the fact that some transformers still suffer from winding deformation and even insulation breakdown under the impact of short-circuit current lower than the specified intensity and the protection is quick. [0003] However, at present, when a short-circuit fault occurs in the winding inside the transformer, the on-s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R27/08G01R27/02G01R31/52G01R31/62G01R31/72G01B7/16G01R1/30G01R1/28
CPCG01R27/08G01R27/02G01B7/16G01B7/18G01R1/30G01R1/28
Inventor 马志钦杨贤蔡玲珑何国强孙文星江丹宇赵东生周永言刘剑锋向谆潘君镇
Owner ELECTRIC POWER RES INST OF GUANGDONG POWER GRID
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