CN-119644214-B - Converter transformer remanence detection sensor and preparation method thereof

Abstract

The invention belongs to the technical field of power equipment and discloses a converter transformer remanence detection sensor and a preparation method thereof, wherein the converter transformer remanence detection sensor comprises a shell, a pressure sensor and an adsorption block, wherein the pressure sensor and the adsorption block are packaged in the shell, the shell is made of nonferromagnetic materials, the adsorption block is made of ferromagnetic materials, the pressure sensor is a flexible pressure sensor and comprises a dielectric layer and electrode layers respectively arranged on two sides of the dielectric layer, the converter transformer remanence detection sensor is arranged on a transformer oil tank and is positioned between an iron core and the adsorption block of the converter transformer, the adsorption block is used for compressing the pressure sensor under the effect of remanence in the iron core, and the pressure sensor is used for outputting a pressure value signal under the compression of the adsorption block. The technical scheme disclosed by the invention can be used for detecting the residual magnetism of the converter transformer, and has higher residual magnetism detection precision and accuracy.

Inventors

• LIU QIANG
• WANG FAN
• CHEN YU
• GAO JIAN
• WANG ZIWEI
• XIE LIQIANG
• LI WENHUI
• HUI HUA

Assignees

• 国网陕西省电力有限公司电力科学研究院
• 国网(西安)环保技术中心有限公司

Dates

Publication Date

20260508

Application Date

20241212

Claims (6)

1. 1. The converter transformer remanence detection sensor is characterized by comprising a shell (1), a pressure sensor (2) and an adsorption block (3); the pressure sensor (2) and the adsorption block (3) are both packaged in the shell (1), one side of the pressure sensor (2) is connected with the inner wall of the shell (1), and the adsorption block (3) is arranged on the other side of the pressure sensor (2); the shell (1) is made of nonferromagnetic materials, and the adsorption block (3) is made of ferromagnetic materials; The pressure sensor (2) is a flexible pressure sensor, and comprises a dielectric layer (21) and electrode layers (22) respectively arranged on two sides of the dielectric layer (21), wherein the dielectric layer (21) is a porous film, and the surface of the dielectric layer (21) forms an arc-shaped bulge structure; The converter transformer remanence detection sensor is used for being mounted on a transformer oil tank, the pressure sensor (2) is located between an iron core of the converter transformer and the adsorption block (3), the adsorption block (3) is used for compressing the pressure sensor (2) under the action of remanence in the iron core, and the pressure sensor (2) is used for outputting a pressure value signal under the compression of the adsorption block (3); The shell (1) comprises a base (11) and a sealing cover (12), wherein the sealing cover (12) is used for being detachably arranged on the base (11), the pressure sensor (2) is provided with a signal wire (23), the signal wire (23) is used for outputting the pressure value signal, the base (11) is provided with a threading hole (111), the signal wire (23) of the pressure sensor (2) extends out of the shell (1) through the threading hole (111), sealing materials are filled between the signal wire (23) and the threading hole (111), the base (11) is provided with a guide pillar (13), the adsorption block (3) is provided with a guide hole, and the adsorption block (3) is sleeved on the guide pillar (13) through the guide hole; an electric field shielding layer is arranged on the outer side of the shell (1), and a negative pressure environment is arranged in the shell (1).
2. 2. A converter transformer remanence detection sensor according to claim 1, further comprising: and the computing terminal is used for acquiring the pressure value signal output by the pressure sensor (2) and computing and obtaining the residual magnetism quantity in the iron core of the converter transformer based on the pressure value signal.
3. 3. A method of manufacturing a converter transformer residual magnetism detection sensor according to claim 1, comprising the steps of: Preparing a pressure sensor (2), attaching an adsorption block (3) to the pressure sensor (2), and packaging the pressure sensor (2) and the adsorption block (3) into a shell (1); The method for preparing the pressure sensor (2) comprises the steps of adding dielectric material dispersion liquid into polydimethylsiloxane dispersion liquid to obtain mixed liquid, adding sodium chloride into the mixed liquid, heating and stirring to colloid, adding curing agent into the colloid, stirring uniformly, smearing the mixture into a mold, drying and curing to obtain a film, putting the obtained film into deionized water, cleaning to remove the sodium chloride to obtain a porous film, and packaging the porous film between two electrode layers (22) to prepare the pressure sensor (2).
4. 4. A method for manufacturing a sensor for detecting remanence of a converter transformer according to claim 3, wherein, The dielectric material is a mixture of one or two of carbon nanotubes and carbon black.
5. 5. A method for manufacturing a sensor for detecting remanence of a converter transformer according to claim 3, wherein, The specific steps of packaging the pressure sensor (2) and the adsorption block (3) into the shell (1) comprise: Assembling the pressure sensor (2) and the adsorption block (3) into the shell (1), wherein one side end surface of the pressure sensor (2) is connected with the inner wall of the shell (1), and the other side end surface of the pressure sensor (2) is connected with the adsorption block (3); And (3) performing vacuum hole pumping treatment on the shell (1), and sealing the shell (1) after a negative pressure environment is formed in the shell (1).
6. 6. A method for manufacturing a sensor for detecting remanence of a converter transformer according to claim 3, wherein, The surface of the die is provided with wavy micro grooves which are used for enabling the surface of the dielectric layer (21) to form an arc-shaped protruding structure.

Description

Converter transformer remanence detection sensor and preparation method thereof Technical Field The invention belongs to the technical field of power equipment, and particularly relates to a converter transformer residual magnetism detection sensor and a preparation method thereof. Background The ultra-high voltage direct current transmission technology has the characteristics of high capacity, low loss, line corridor saving and the like, and is an economic and efficient transmission mode. The converter transformer is core equipment of an extra-high voltage direct current transmission system, and directly affects safe and reliable operation of the whole direct current transmission system. When the converter transformer is withdrawn and after the direct current resistance test is carried out on the converter transformer, residual magnetism is generated in the converter transformer, exciting inrush current and overvoltage are generated when the converter transformer is put into operation in the state, and the safety of a power grid system and power equipment is seriously threatened, so that the residual magnetism in the converter transformer must be eliminated before the converter transformer is put into operation. The existing demagnetizing method of the converter transformer mainly comprises a direct current method, a power frequency alternating current method and a low frequency alternating current method, when the remanence in the converter transformer is eliminated, the remanence in the converter transformer is generally required to be detected, however, the converter transformer is a complex combination of stray capacitance and linear/nonlinear inductance, and according to different external load conditions, a complex magnetic process still exists in an iron core during and after cutting excitation, so that the remanence detection result is unreliable, and the demagnetizing effect is further influenced. Disclosure of Invention The invention aims to provide a converter transformer residual magnetism detection sensor and a preparation method thereof, which are used for solving one or more of the technical problems. The technical scheme provided by the invention can detect the residual magnetism of the converter transformer, and has higher residual magnetism detection precision and accuracy. In order to achieve the above purpose, the invention adopts the following technical scheme: The invention provides a converter transformer remanence detection sensor, which comprises a shell, a pressure sensor and an adsorption block, wherein the shell is provided with a sensor; The pressure sensor and the adsorption block are both encapsulated in the shell, one side of the pressure sensor is connected with the inner wall of the shell, and the adsorption block is arranged on the other side of the pressure sensor; The shell is made of nonferromagnetic materials, and the adsorption block is made of ferromagnetic materials; The pressure sensor is a flexible pressure sensor, and comprises a dielectric layer and electrode layers respectively arranged at two sides of the dielectric layer; The converter transformer remanence detection sensor is used for being installed in a transformer oil tank, the pressure sensor is located between an iron core of the converter transformer and the adsorption block, the adsorption block is used for compressing the pressure sensor under the action of remanence in the iron core, and the pressure sensor is used for outputting a pressure value signal under the compression of the adsorption block. A further improvement of the present invention is that, The shell comprises a base and a sealing cover, wherein the sealing cover is detachably arranged on the base; the pressure sensor is provided with a signal wire which is used for outputting the pressure value signal; the base is provided with a threading hole, a signal wire of the pressure sensor extends out of the shell through the threading hole, and a sealing material is filled between the signal wire and the threading hole; the base is provided with a guide post, the adsorption block is provided with a guide hole, and the adsorption block is sleeved and installed on the guide post through the guide hole. A further improvement of the present invention is that, An electric field shielding layer is arranged on the outer side of the shell. A further improvement of the present invention is that, The shell is in a negative pressure environment. A further improvement of the present invention is that, The surface of the dielectric layer of the flexible pressure sensor forms an arc-shaped protruding structure. A further improvement of the present invention is that it further comprises: and the computing terminal is used for acquiring the pressure value signal output by the pressure sensor and computing and obtaining the residual magnetism quantity in the iron core of the converter transformer based on the pressure value signal. The invention provides a