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Method for diagnosing direct current partial discharging insulation state of converter transformer and measurement system

A converter transformer, partial discharge technology, applied in the direction of testing dielectric strength, etc., to achieve the effect of accurate detection

Active Publication Date: 2013-08-21
WUHAN NARI LIABILITY OF STATE GRID ELECTRIC POWER RES INST +2
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Problems solved by technology

This patent has not yet provided a reasonable solution for DC partial discharge diagnosis of the internal insulation state of the converter transformer

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  • Method for diagnosing direct current partial discharging insulation state of converter transformer and measurement system
  • Method for diagnosing direct current partial discharging insulation state of converter transformer and measurement system
  • Method for diagnosing direct current partial discharging insulation state of converter transformer and measurement system

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Embodiment Construction

[0038] Explanation of the title of this patent:

[0039] Apparent discharge: refers to the injection of a certain amount of charge at both ends of the test object of the partial discharge of the power equipment, so that the change of the terminal voltage of the test object is the same as the change of the terminal voltage during partial discharge. The amount of charge injected at this time is called the apparent discharge amount of the partial discharge, expressed in pC, referred to as the discharge amount.

[0040] High-frequency pulse calibration generator: generate standard wide-band pulse calibration waveform, which differs from common calibration pulse generators in that the rising edge time is <30ns;

[0041] Description of the drawings: Z1, Z2 and Z3—non-inductive resistance sensors with built-in surge protectors, the resistance value of the non-inductive resistance is 100Ω; HVDC is a high-voltage DC voltage generator; the high-frequency pulse calibration generator requ...

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Abstract

The invention belongs to the technical field of power transmission and transformation equipment, and particularly relates to a method for diagnosing a direct current partial discharging insulation state of a converter transformer and a measurement system. Through measurement of partial discharging pulse signals of different transmission paths, statistical properties of distributed real-time partial discharging pulse signals and cluster characteristics of segmented amplitude-frequency space are compared to identify an internal insulation state, characteristic information of the direct current partial discharging insulation state of the converter transformer can be effectively and accurately detected, and insulation defect types and a partial discharging development tendency are evaluated comprehensively.

Description

technical field [0001] The invention belongs to the technical field of power transmission and transformation equipment, and in particular relates to a method and a measurement system for diagnosing the DC partial discharge insulation state of a converter transformer. Background technique [0002] In order to ensure the safety of the converter transformer during operation, higher requirements are put forward for the partial discharge test in the equipment converter transformer factory test specification, and this test has also become the most effective means for transformer design and manufacturing process assessment. At present, the IEC61378-2 standard is generally used in the world to assess the insulation structure of high-voltage DC equipment. The regulations on the high-voltage DC withstand voltage test in the IEC61378 standard are as follows: the DC withstand voltage test time is 2 hours, and the charging time is required to be no more than 1 minute. After the test, the...

Claims

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Application Information

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IPC IPC(8): G01R31/12
Inventor 刘凡聂德鑫卢理成邓建钢彭倩张连星杜振波罗先中贺细雄
Owner WUHAN NARI LIABILITY OF STATE GRID ELECTRIC POWER RES INST
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