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Transformer fault detection method and box-type transformer

A technology for transformer faults and detection methods, applied in the field of transformers, can solve the problems of inability to specifically determine the specific location of the fault type, inability to effectively determine the severity of the fault, and detection of a single transformer fault, so as to improve the maintenance management efficiency and facilitate maintenance and replacement. , the effect of reducing workload

Active Publication Date: 2020-10-30
NINGBO AUX HIGH TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003]At present, the methods for detecting transformer faults in power systems are relatively simple, especially for larger box-type transformers, and it is impossible to specifically determine the type of fault and the location of the fault. The specific location cannot effectively judge the severity of the fault, which has a relatively negative impact on the on-site personnel's understanding of the internal deformation of the transformer, and is not conducive to the development of the next step of detection work

Method used

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  • Transformer fault detection method and box-type transformer
  • Transformer fault detection method and box-type transformer
  • Transformer fault detection method and box-type transformer

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Embodiment 1

[0054] Such as figure 1 As shown, it is a flow chart of the transformer fault detection method provided by the embodiment of the present invention. In this embodiment, the transformer fault detection method is based on a predetermined fault value range and a normal value range to judge whether the transformer under test is faulty, and specifically includes the following process:

[0055] Step S1: Judging whether the transformer running state is abnormal according to the first transformer running parameter, and controlling and adjusting the running state.

[0056] Wherein the first operating parameter includes the internal temperature of the transformer, output current and / or output voltage.

[0057] First, after the transformer has been running for a period of time, it starts to detect the various operating parameters of the transformer. Due to the limitation of the internal structure of the transformer, heat will be generated inside the transformer after it starts running, ca...

Embodiment 2

[0074] On the basis of Embodiment 1, this embodiment further limits the transformer fault detection method. Specifically, it includes the following processes:

[0075] Step S11: Start the transformer to start running.

[0076] Step S12: After the running time of the transformer reaches the first predetermined time, the detection device starts to detect the internal temperature T of the transformer.

[0077] Wherein the first predetermined time is determined according to the time from when the transformer is turned on to when it reaches a stable running state. When the running time of the transformer is less than the first predetermined time, the transformer has not yet entered the normal running state, and the detected internal temperature of the transformer is low, which affects the judgment result. Therefore, after the operating time of the transformer reaches the first predetermined time, the internal temperature of the transformer must be detected through the temperature...

Embodiment 3

[0113] As an embodiment of the present invention, this embodiment also provides a box-type transformer fault detection system. The transformer includes a box body, a transformer body and a detection system. The transformer body includes a transformer winding, a transformer core and a cooling device, and cooling oil is stored in the cooling device. For box-type transformers with larger iron cores, in order to facilitate heat dissipation inside the iron core and fully reduce eddy current losses, etc., the cooling device is installed between the silicon steel sheet laminations that make up the iron core, and the iron core is divided into several parts by the cooling device. Core frame. During the lamination process of the transformer core, the silicon steel sheets on both sides of the cooling device may be short-circuited, resulting in a short circuit between the core frames.

[0114] The detection system includes a control device, an analysis module, a timer and a detection dev...

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Abstract

The invention provides a transformer fault detection method and a box-type transformer. The transformer fault detection method comprises the following steps of: judging whether an operation state of the transformer is abnormal or not through using first operation parameters of the transformer, and controlling and adjusting the operation state; judging whether a transformer fault exists in a winding or not according to second transformer operating parameters, wherein a winding fault verification program is used for verifying whether a fault actually occurs in the winding; detecting the type ofa winding fault through analyzing internal temperature; and conducting iron core fault type detection when the type of the winding fault is judged as an iron core fault according to the transformer vibration information through analyzing oil temperature, oil pressure and vibration signals of the transformer. The transformer fault detection method provided by the embodiment of the invention can accurately detect whether the transformer runs abnormally or fails or not, can judge the fault type and the specific position of the fault of the transformer, and is convenient for maintenance personnelto maintain and replace the transformer in a targeted manner especially for the box-type transformer with a large size.

Description

technical field [0001] The invention relates to the field of transformers, in particular to a transformer fault detection method and a box-type transformer. Background technique [0002] As an integral part of the power transmission and distribution system, the safety and stability of the transformer is of great significance to the development of the national economy. Today, as the voltage level continues to increase, power system failures caused by transformer accidents are becoming more frequent, which is not only detrimental to the rapid economic development, but also seriously affects the normal life of residents. According to statistics, from 1995 to 1999, there were 284 accidents of 110kV and above power transformers in the country, and the total accident capacity was 21360MVA. faults and winding faults. Among them, the iron core fault is mostly caused by the vibration of the transformer body. The vibration of the transformer body is mainly caused by the vibration of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/00G01R31/62
CPCG01R31/00
Inventor 陈欢杨德富俞其峰李有明
Owner NINGBO AUX HIGH TECH
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