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Acoustic-electric combined transformer partial discharge identification and positioning device and method

A combination of partial discharge and sound-electricity technology, applied to measuring devices, measuring electrical variables, instruments, etc., can solve problems such as costing a lot of manpower and material resources, equipment burning, insulation breakdown, etc., to save workload, improve work efficiency, The effect of improving accuracy

Pending Publication Date: 2021-05-07
STATE GRID LIAONING ELECTRIC POWER RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In recent years, the scale of the power grid has continued to expand, and UHV projects have been gradually put into operation, which puts forward higher requirements for the safety and reliability of transformers. Partial discharge (PD) inside transformers is similar to chronic tumors in the insulation system of power equipment. Long-term The discharge process will lead to insulation breakdown, and even lead to safety accidents such as equipment burning
The internal insulation structure of the power transformer is complex, and the types of PD insulation defects are also different. The traditional PD pattern recognition uses the pulse current method to judge whether it meets the requirements of the regulations by reading the discharge value and discharge waveform of the tester. Most of the work Judgment depends on the experience of the test personnel. If the partial discharge is found to exceed the standard value, further ultrasonic positioning is required to determine the approximate location of the discharge point, which requires a lot of manpower and material resources. If the test personnel are inexperienced, it is difficult to accurately locate the discharge point. Returning to the factory for maintenance will bring a lot of work

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  • Acoustic-electric combined transformer partial discharge identification and positioning device and method
  • Acoustic-electric combined transformer partial discharge identification and positioning device and method
  • Acoustic-electric combined transformer partial discharge identification and positioning device and method

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Embodiment 1

[0040] The present invention is an acousto-electric combination transformer partial discharge identification and positioning method, such as figure 1 as shown, figure 1 It is a flow chart of identifying and locating partial discharge of a transformer combined with sound and electricity according to the present invention.

[0041] The inventive method comprises the following steps:

[0042] Step 1. Preparations before the test.

[0043] Including connecting the test circuit, reliable grounding of the equipment, using the end screen of the high-voltage bushing of the test product as the coupling capacitor, using the detection impedance to extract the pulse current signal from the end screen of the transformer bushing for partial discharge testing, and using a 50-ohm coaxial cable to connect the test instrument to the One channel of incoming signal input is connected to the amplifier terminal of the input unit, and a shielding cover is installed at the end of the bushing to eli...

Embodiment 2

[0051]The present invention also provides an embodiment, which is an acoustic-electric combination transformer partial discharge identification and positioning device, which is different from the traditional test method in that the ultrasonic partial discharge signal detection is performed while the pulse current method is used to detect the partial discharge of the transformer. The ultrasonic signal sensor is adsorbed on the transformer mailbox through a magnet, and the sensor is connected to the partial discharge identification and positioning device of the transformer combined with acoustic and electric through optical fiber, so as to realize the simultaneous application of the pulse current method and the ultrasonic method, and locate the discharge position.

[0052] Such as figure 2 as shown, figure 2 It is a circuit diagram of the transformer partial discharge identification and location device combined with acoustic and electric power of the present invention.

[005...

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Abstract

The invention belongs to the technical field of power transformer partial discharge identification and positioning, and particularly relates to an acoustic-electric combined transformer partial discharge identification and positioning device and method. According to the device, an ultrasonic positioning generator is integrated in detection impedors, the detection impedors are connected to a sleeve ascending flanged base through magnets, and each detection impedor synchronously transmits an ultrasonic signal to the interior of a transformer; the partial discharge test of the transformer is carried out by combining ultrasonic waves and a pulse current method; the method comprises the following steps: performing preparation work before a test; using a calibration pulse generator to calibrate the transformer test loop; applying voltage to the transformer test loop; and comprehensively analyzing and positioning the partial discharge waveform and the discharge capacity. The device and the method can improve the discrimination accuracy, save the workload of follow-up special ultrasonic positioning, improve the working efficiency, and provide a technical basis for the fault maintenance after the transformer is put into operation and put into production with zero defect.

Description

technical field [0001] The invention belongs to the technical field of partial discharge identification and positioning of power transformers, and in particular relates to an acoustic-electric combination transformer partial discharge identification and positioning device and method, in particular to an acoustic-electric combination transformer partial discharge identification and positioning diagnosis and analysis device method. Background technique [0002] Large-scale power transformers are important equipment in the power system, and the safety and reliability of their operation directly affect the stability and reliability of the power system. [0003] In recent years, the scale of the power grid has continued to expand, and UHV projects have been gradually put into operation, which puts forward higher requirements for the safety and reliability of transformers. Partial discharge (PD) inside transformers is similar to chronic tumors in the insulation system of power equ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/12G01R31/14
CPCG01R31/1209G01R31/14G01R31/1227
Inventor 刘旸韩洪刚鲁旭臣韦德福宋云东牛李王南周榆晓郭铁郭志楠赵振扬张彬杨鹤李佳奇包蕊
Owner STATE GRID LIAONING ELECTRIC POWER RES INST