阅读说明：本技术 一种天然酯绝缘油浸渍油纸电容式套管及其检测方法 (Natural ester insulating oil impregnated oilpaper capacitive bushing and detection method thereof ) 是由 殷守斌 鉴庆之 田克强 刘宏领 王维令 赵军磊 郭奇军 王智杰 张卫国 彭顺 时 于 2021-01-07 设计创作，主要内容包括：本发明公开了一种天然酯绝缘油浸渍油纸电容式套管及其检测方法,包括导电杆,所述导电杆的外侧包裹有绝缘层,所述绝缘层是由绝缘纸绕设而成,所述绝缘层内套设有若干层铝箔,所有的所述铝箔是直径不一的同心圆筒结构,所述铝箔配合绝缘层共同组成若干多层容,所述绝缘层内填充天然酯绝缘油,所述导电杆顶端固定连接接线端子,所述接线端子是选用铜材制制作而成,所述导电杆的底端固定连接有法兰,所述绝缘层的外侧套设有瓷屏；通过铝箔配合绝缘层构成多层电容,进而利用多层电容用以均匀分担整个装置内的电压,以降低电压对整个装置的负担,能大幅提升整个装置维护的便利性,能大幅提升整个装置应用的便利性。(The invention discloses a natural ester insulating oil impregnated paper condenser type sleeve and a detection method thereof, wherein the natural ester insulating oil impregnated paper condenser type sleeve comprises a conductive rod, the outer side of the conductive rod is wrapped with an insulating layer, the insulating layer is formed by winding insulating paper, a plurality of layers of aluminum foils are sleeved in the insulating layer, all the aluminum foils are concentric cylinder structures with different diameters, the aluminum foils and the insulating layer are matched to form a plurality of layers of containers, the insulating layer is filled with natural ester insulating oil, the top end of the conductive rod is fixedly connected with a connecting terminal, the connecting terminal is made of copper materials, the bottom end of the conductive rod is fixedly connected with a flange, and the outer side of the insulating layer is sleeved with a porcelain screen; form multilayer electric capacity through aluminium foil cooperation insulating layer, and then utilize multilayer electric capacity to be used for evenly sharing the voltage in the whole device to reduce the burden of voltage to whole device, can promote the convenience that whole device maintained by a wide margin, can promote the convenience that whole device used by a wide margin.)

1. The capacitance type bushing is characterized by comprising a conductive rod (1), wherein an insulating layer (2) wraps the outer side of the conductive rod (1), the insulating layer (2) is formed by winding insulating paper, a plurality of layers of aluminum foils (3) are sleeved in the insulating layer (2), all the aluminum foils (3) are concentric cylinder structures with different diameters, and the aluminum foils (3) are matched with the insulating layer (2) to form a plurality of layers of capacitors together;

the insulating layer (2) is filled with natural ester insulating oil (4);

the top end of the conductive rod (1) is fixedly connected with a wiring terminal (5);

the bottom fixedly connected with flange (6) of conducting rod (1), the outside cover of insulating layer (2) is equipped with porcelain screen (7).

2. The natural ester insulating oil impregnated paper condenser bushing as claimed in claim 1, wherein the connection terminal (4) is made of copper material.

3. The oil impregnated paper condenser bushing of claim 2, wherein the surface of the connection terminal (4) is plated with a silver layer or a zinc layer.

4. The oil-impregnated paper condenser bushing as claimed in claim 1, wherein the porcelain screen (7) is formed by an alternating umbrella structure with different sizes.

5. The method for detecting the natural ester insulating oil impregnated paper condenser bushing as claimed in claim 1, comprising the steps of:

s1) acquiring hydrogen content data in the insulating oil of the casing: directly detecting the hydrogen content in the natural ester insulating oil (4), and transmitting the hydrogen content data to a data analysis processing system through a data transmission line;

s2) the data processing system analyzing the data: the data analysis processing system analyzes the acquired data according to an algorithm, judges whether the hydrogen content exceeds a threshold value or not, if not, continues to execute the step S1, and if so, sends out an alarm by the early warning device, and then executes the step S3; wherein the threshold is 80%;

s3) oil sampling and performing oil chromatography detection: collecting an oil sample of natural ester insulating oil (4) in the sleeve, and carrying out gas chromatography to obtain a characteristic value of gas dissolved in the oil;

s4) judging the fault type according to the oil chromatogram: judging the fault type directly according to the characteristic value;

s5) the comprehensive judgment of the casing state is carried out by combining the casing voltage, the casing current and the casing fault type: and finally, the running state of the sleeve is comprehensively judged based on the fault type, the voltage and the current of the sleeve, the internal fault of the natural ester insulation oil-impregnated paper oil capacitor sleeve is accurately judged, and the problem that the internal fault of the natural ester insulation oil-impregnated paper oil capacitor sleeve cannot be reliably diagnosed can be effectively solved.

Technical Field

The invention relates to the technical field of transformers, in particular to a natural ester insulating oil impregnated oilpaper capacitive bushing and a detection method thereof.

Background

In conventional transformer equipment, mineral insulating oil is widely used because of its good insulating and cooling properties and low price. In recent years, with the growing concern about ecological environmental problems, natural ester insulating oil is gradually replacing mineral insulating oil as an insulating cooling medium of transformers. Compared with the traditional mineral insulating oil, the natural ester insulating oil has the advantages that the natural ester insulating oil is green and environment-friendly, has a biodegradation rate of more than 95 percent, can be automatically degraded, does not pollute the land, water sources and the like, and is suitable for environment-sensitive areas such as water source areas, farmlands, scenic spots, streets and the like; the natural ester insulating oil is derived from various plants, so that the dependence on petroleum products can be effectively reduced; the fire-proof safety performance is high, and the natural ester insulating oil belongs to K-grade insulating liquid and has excellent fire-resistant characteristic.

With the wider application range of the natural ester insulating oil transformer, the sleeve is used as an important component in the transformer, and once the transformer (oil immersed reactor) is damaged greatly by a fault, a large-range power failure accident is easily caused. The sleeve is a place with very concentrated field intensity, the daily operation and maintenance are difficult, the conventional test is usually carried out on the sleeve only under the condition of power failure and off-line, the detection period is long, once the insulation defect occurs during the operation, the advance diagnosis and prevention can not be realized, and the major accident is directly caused. In order to ensure safe and reliable operation of the natural ester insulating oil on the oil paper capacitive bushing of the transformer, the invention provides the oil paper capacitive bushing impregnated with the natural ester insulating oil and the detection method thereof, which can well solve the problems.

Disclosure of Invention

The invention aims to provide a natural ester insulating oil impregnated oilpaper capacitive bushing and a detection method thereof, so as to solve the problems in the background technology.

In order to achieve the purpose, the invention provides the following technical scheme:

the utility model provides a natural ester insulating oil soaks oiled paper condenser type bushing, includes the conducting rod, the outside parcel of conducting rod has the insulating layer, the insulating layer is formed by insulating paper winding, the insulating layer endotheca is equipped with a plurality of layers of aluminium foil, all the aluminium foil is the concentric cylinder structure that the diameter is different, a plurality of multilayer appearance are constituteed jointly to aluminium foil cooperation insulating layer, constitute multilayer electric capacity through aluminium foil cooperation insulating layer, and then utilize multilayer electric capacity to evenly share the voltage in the whole device to reduce the burden of voltage to whole device, can promote the convenience that the whole device maintained by a wide margin, can promote the convenience that the whole device used by a wide margin;

filling natural ester insulating oil in the insulating layer;

the top end of the conducting rod is fixedly connected with a connecting terminal, the connecting terminal is made of copper materials, and a silver layer or a zinc layer is plated on the surface of the connecting terminal;

the bottom fixedly connected with flange of conducting rod, the outside cover of insulating layer is equipped with the porcelain screen, the porcelain screen comprises in turn by the umbelliform structure not of uniform size, through setting up the porcelain screen for external insulation improves whole device external electric field and distributes, can further improve the convenience that whole device maintained, can further promote the convenience that whole device used.

A detection method of a natural ester insulating oil impregnated oilpaper capacitive bushing comprises the following steps:

s1) acquiring hydrogen content data in the insulating oil of the casing: directly detecting the hydrogen content in the natural ester insulating oil, and transmitting the hydrogen content data to a data analysis processing system through a data transmission line;

s2) the data processing system analyzing the data: the data analysis processing system analyzes the acquired data according to an algorithm, judges whether the hydrogen content exceeds a threshold value or not, if not, continues to execute the step S1, and if so, sends out an alarm by the early warning device, and then executes the step S3; wherein the threshold is 80%;

s3) oil sampling and performing oil chromatography detection: collecting an oil sample of the natural ester insulating oil in the sleeve, and carrying out gas chromatography to obtain a characteristic value of gas dissolved in the oil;

s4) judging the fault type according to the oil chromatogram: judging the fault type directly according to the characteristic value;

s5) the comprehensive judgment of the casing state is carried out by combining the casing voltage, the casing current and the casing fault type: and finally, the running state of the sleeve is comprehensively judged based on the fault type, the voltage and the current of the sleeve, the internal fault of the natural ester insulation oil-impregnated paper oil capacitor sleeve is accurately judged, and the problem that the internal fault of the natural ester insulation oil-impregnated paper oil capacitor sleeve cannot be reliably diagnosed can be effectively solved.

Compared with the prior art, the invention has the beneficial effects that:

1. the invention forms a multilayer capacitor by matching the aluminum foil with the insulating layer, and further utilizes the multilayer capacitor to uniformly share the voltage in the whole device, so as to reduce the burden of the voltage on the whole device, greatly improve the maintenance convenience of the whole device and greatly improve the application convenience of the whole device;

2. the ceramic screen is used for external insulation and improvement of electric field distribution outside the whole device, so that the convenience of maintenance of the whole device can be further improved, and the convenience of application of the whole device can be further improved;

3. the invention can directly detect whether hydrogen exceeds a threshold value or not in the whole device operation process, carries out early warning according to the hydrogen exceeding threshold value, then samples natural ester insulating oil for further gas chromatography analysis to obtain a characteristic value of dissolved gas in the oil, directly judges the fault type, and finally comprehensively judges the operation state of the sleeve based on the fault type, the voltage and the current of the sleeve, accurately judges the internal fault of the natural ester insulating oil impregnated paper capacitive sleeve, can effectively solve the problem that the internal fault of the natural ester insulating oil impregnated paper capacitive sleeve cannot be reliably diagnosed, and can effectively avoid the occurrence of major safety accidents.

Drawings

Fig. 1 is a schematic structural diagram of a natural ester insulating oil-impregnated oilpaper condenser bushing.

Fig. 2 is a flow chart of a detection method of a natural ester insulating oil impregnated paper oil capacitive bushing.

In the figure: 1-conducting rod, 2-insulating layer, 3-aluminum foil, 4-natural ester insulating oil, 5-wiring terminal, 6-flange and 7-porcelain screen.

Detailed Description

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1, the natural ester insulating oil impregnated oilpaper capacitive bushing comprises a conductive rod 1, wherein an insulating layer 2 wraps the outer side of the conductive rod 1, the insulating layer 2 is formed by winding insulating paper, a plurality of layers of aluminum foils 3 are sleeved in the insulating layer 2, all the aluminum foils 3 are of concentric cylinder structures with different diameters, the aluminum foils 3 and the insulating layer 2 form a plurality of multilayer capacitors together, the aluminum foils 3 and the insulating layer 2 form a multilayer capacitor, and the multilayer capacitor is used for uniformly sharing voltage in the whole device so as to reduce the burden of the voltage on the whole device, greatly improve the maintenance convenience of the whole device and greatly improve the application convenience of the whole device;

the insulating layer 2 is filled with natural ester insulating oil 4;

the top end of the conducting rod 1 is fixedly connected with a connecting terminal 5, the connecting terminal 4 is made of copper materials, and the surface of the connecting terminal 4 is plated with a silver layer or a zinc layer;

the bottom fixedly connected with flange 6 of conducting rod 1, the outside cover of insulating layer 2 is equipped with porcelain screen 7, porcelain screen 7 comprises in turn by the umbrella-shaped structure not of uniform size, through setting up porcelain screen 7 for external insulation improves whole device external electric field and distributes, can further improve the convenience that whole device maintained, can further promote the convenience that whole device used.

Referring to fig. 2, a method for detecting a natural ester insulating oil impregnated oilpaper capacitive bushing includes the following steps:

s1) acquiring hydrogen content data in the insulating oil of the casing: directly detecting the hydrogen content in the natural ester insulating oil 4, and transmitting the hydrogen content data to a data analysis processing system through a data transmission line; s2) the data processing system analyzing the data: the data analysis processing system analyzes the acquired data according to an algorithm, judges whether the hydrogen content exceeds a threshold value or not, if not, continues to execute the step S1, and if so, sends out an alarm by the early warning device, and then executes the step S3; wherein the threshold is 80%; s3) oil sampling and performing oil chromatography detection: collecting an oil sample of the natural ester insulating oil 4 in the sleeve, and carrying out gas chromatography to obtain a characteristic value of gas dissolved in the oil; s4) judging the fault type according to the oil chromatogram: judging the fault type directly according to the characteristic value; s5) the comprehensive judgment of the casing state is carried out by combining the casing voltage, the casing current and the casing fault type: and finally, the running state of the sleeve is comprehensively judged based on the fault type, the voltage and the current of the sleeve, the internal fault of the natural ester insulation oil-impregnated paper oil capacitor sleeve is accurately judged, and the problem that the internal fault of the natural ester insulation oil-impregnated paper oil capacitor sleeve cannot be reliably diagnosed can be effectively solved.

For overheating type faults, palm-based natural ester insulating oil has H as the most main gas component in oil₂And with increasing temperature, C₂H₄The proportion of hydrogen and hydrocarbon (the sum of hydrogen and total hydrocarbon) is increased gradually. For this purpose, the invention uses H₂And C₂H₄The gas is used as the main characteristic gas of the overheating fault of the palm-based natural ester insulating oil. The most main gas component of the natural ester insulating oil adopting the soybean base or the rapeseed base is C₂H₆And with increasing temperature, C₂H₄The proportion of hydrogen and hydrocarbon (the sum of hydrogen and total hydrocarbon) is increased gradually. For this purpose, the invention uses C₂H₆And C₂H₄The gas is the main characteristic gas of overheating type faults of natural ester insulating oil of soybean base or rapeseed base. The gas index parameters of the low-temperature overheating fault and the high-temperature overheating fault obtained by statistics are shown in table 1:

TABLE 1 gas index parameters for Low temperature overheat Fault and high temperature overheat Fault

For high-energy discharge faults in discharge type faults, the invention uses C₂H₂The gas index parameters of the high-energy discharge fault, which are counted and taken as the main characteristic gas of the high-energy discharge fault of the natural ester insulating oil, are shown in table 2:

TABLE 2 gas index parameters for high-energy discharge failure

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.