JP2007281275A - Method for diagnosing deterioration of molded transformer - Google Patents

Method for diagnosing deterioration of molded transformer Download PDF

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JP2007281275A
JP2007281275A JP2006107203A JP2006107203A JP2007281275A JP 2007281275 A JP2007281275 A JP 2007281275A JP 2006107203 A JP2006107203 A JP 2006107203A JP 2006107203 A JP2006107203 A JP 2006107203A JP 2007281275 A JP2007281275 A JP 2007281275A
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deterioration
coil
mold
transformer
measuring
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Masaki Takeuchi
正樹 竹内
Tomohiro Kaizu
朋宏 海津
Atsushi Suzuki
敦 鈴木
Kohei Sato
孝平 佐藤
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Hitachi Industrial Equipment Systems Co Ltd
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Hitachi Industrial Equipment Systems Co Ltd
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  • Testing Electric Properties And Detecting Electric Faults (AREA)
  • Insulating Of Coils (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a technique simply diagnosing the deterioration of a molded transformer accurately. <P>SOLUTION: A member for measuring an insulating property is fitted detachably in a molded coil, and the member for measuring the insulating property is extracted from the molded coil in the case of the diagnosis of the deterioration. An insulating performance such as the breakdown voltage of the member is measured for measuring the insulating property, and the state of the deterioration of the molded coil is evaluated on the basis of the result of the measurement. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

本発明は、モールド変圧器の劣化状態を診断する技術に関する。   The present invention relates to a technique for diagnosing a deterioration state of a molded transformer.

従来、モールド変圧器の劣化状態の診断は、コイル内の絶縁物の劣化状態を測定することにより行っていた。モールドコイル内の絶縁物の劣化状態は、一般試験による測定、部分放電による測定、光診断による測定などにより行う。一般試験の場合は、モールドコイル内の絶縁物の絶縁抵抗や誘電正損を測定し、部分放電による場合は、絶縁物につき放電電荷の量を測定し、光診断による場合は、絶縁物について光の反射率を測定する。
また、本発明に関連した従来技術であって特許文献に記載されたものとしては、例えば特開平７−１６１５５０号公報（特許文献１）や特開平２−１５４１６２号公報（特許文献２）に記載された技術がある。特開平７−１６１５５０号公報には、モールド変圧器の温度測定において、時間的遅れが少なくかつ正確な温度測定をするために、低圧コイルの巻き終わり引出し線に隣接した隙間部に温度センサを配設するとした構成が記載され、特開平２−１５４１６２号公報には、油入電気機器などの電気機器の寿命判定法として、電気機器本体内に用いられる絶縁物を模擬するサンプル用絶縁物を電気機器本体内または本体に隣接して設け、該サンプル絶縁物に、本体内の絶縁物が受ける熱の状態と等価の熱状態を与え、寿命判定時に該サンプル絶縁物を、電気機器を停止させることなく取出すことができるようにするとした構成が記載されている。 Conventionally, the diagnosis of the deterioration state of the molded transformer has been performed by measuring the deterioration state of the insulator in the coil. The deterioration state of the insulator in the mold coil is determined by measurement by a general test, measurement by partial discharge, measurement by optical diagnosis, or the like. In the case of a general test, the insulation resistance and dielectric loss of the insulator in the molded coil are measured. In the case of partial discharge, the amount of discharge charge is measured for the insulator. Measure the reflectance.
Moreover, as a prior art related to the present invention and described in the patent document, for example, described in Japanese Patent Application Laid-Open No. 7-161550 (Patent Document 1) and Japanese Patent Application Laid-Open No. 2-154162 (Patent Document 2). Technology has been developed. In JP-A-7-161550, a temperature sensor is arranged in the gap adjacent to the winding end lead wire of the low voltage coil in order to measure the temperature of the mold transformer with little time delay and accurate. Japanese Patent Laid-Open No. 2-154162 discloses a sample insulator that simulates an insulator used in an electric device body as a method for determining the life of an electric device such as an oil-filled electric device. Provided in the equipment main body or adjacent to the main body, giving the sample insulator a heat state equivalent to the heat received by the insulator in the main body, and stopping the sample insulator when the life is determined A configuration is described so that it can be removed without any problem.

特開平７−１６１５５０号公報JP-A-7-161550 特開平２−１５４１６２号公報JP-A-2-154162

上記従来の一般試験による測定や、部分放電による測定や、光診断による測定においてはいずれも、劣化状態の診断時にモールド変圧器の運転を停止しかつ測定可能な状態にする必要がある。また、上記特開平７−１６１５５０号公報記載の技術は、温度センサの配設位置を低圧コイルの巻き終わり引出し線に隣接した隙間部とするもので、変圧器の負荷管理や異常発熱の監視を目的としている。また、特開平２−１５４１６２号公報記載の技術は、サンプル用の絶縁物を発熱抵抗体に巻回して電気機器の巻線を模擬させる構成のため、（ａ）該発熱抵抗体や電源や電流調整抵抗や接続用電線などが必要となること、（ｂ）該発熱抵抗体の温度が電気機器の巻線の温度と等価となるように通電電流値を管理する必要があること、（ｃ）電気機器の寿命判定時には、該サンプル用の絶縁物の一部を切り取って取出す必要があることなど、部品点数の増大、コストの増大、信頼性の低下などにつながり易い要因が予想される。   In any of the above-mentioned measurement by the conventional test, measurement by partial discharge, and measurement by optical diagnosis, it is necessary to stop the operation of the mold transformer and make it measurable when diagnosing the deterioration state. Further, the technique described in the above-mentioned Japanese Patent Application Laid-Open No. Hei 7-161550 uses a gap portion adjacent to the winding end lead wire of the low voltage coil as the position where the temperature sensor is disposed. It is aimed. In addition, the technique described in Japanese Patent Laid-Open No. 2-154162 is configured to simulate a winding of an electrical device by winding a sample insulator around a heating resistor, so that (a) the heating resistor, power source, and current An adjustment resistor, a connecting wire, etc. are required; (b) it is necessary to manage the energization current value so that the temperature of the heating resistor is equivalent to the temperature of the winding of the electrical device; and (c). Factors that are likely to lead to an increase in the number of parts, an increase in cost, a decrease in reliability, and the like, such as the need to cut out and remove a part of the insulator for the sample at the time of determining the life of the electrical equipment, are expected.

本発明の課題点は、上記従来技術の状況に鑑み、モールド変圧器において、部品点数やコストを増大させることなく、また、信頼性を低下させずにモールドコイルの劣化状態の判別を行えるようにすることである。
本発明の目的は、上記課題点を解決し、モールド変圧器の簡易かつ正確な劣化診断技術を提供することにある。 The problem of the present invention is that, in view of the above-described state of the prior art, in a molded transformer, it is possible to determine the deterioration state of a molded coil without increasing the number of parts and cost and without reducing reliability. It is to be.
An object of the present invention is to solve the above-described problems and provide a simple and accurate deterioration diagnosis technique for a molded transformer.

上記課題点を解決するために、本発明では、モールド変圧器の劣化診断方法として、劣化性能測定用部材をモールドコイル中に着脱可能に装着しておき、劣化診断時に、該劣化性能測定用部材をモールドコイルから取り出して、その絶縁破壊電圧など絶縁性能を測定し、該測定結果に基づき、モールドコイルの劣化状態を判別する。劣化状態が、予め設定したレベルに達している場合にはモールド変圧器の運転を停止して対応する。   In order to solve the above-described problems, in the present invention, as a deterioration diagnosis method for a mold transformer, a member for measuring deterioration performance is detachably mounted in a mold coil, and the member for measuring deterioration performance is measured at the time of deterioration diagnosis. Is taken out of the mold coil, the insulation performance such as the dielectric breakdown voltage is measured, and the deterioration state of the mold coil is determined based on the measurement result. When the deterioration state reaches a preset level, the operation of the mold transformer is stopped to cope with it.

本発明によれば、簡易かつ正確にモールド変圧器の劣化診断を行うことができる。   According to the present invention, it is possible to easily and accurately diagnose deterioration of a molded transformer.

以下、本発明の実施例につき、図面を用いて説明する。
図１〜図４は、本発明の実施例の説明図である。図１は、本発明が実施されるモールド変圧器の構成例図、図２は、図１のモールド変圧器において劣化性能測定用部材を収納する部分の構成を示す図、図３は、図１のモールド変圧器において温度測定用の感温部材を収納する部分の構成を示す図、図４は、モールド変圧器の連続使用温度と使用時間と絶縁破壊電圧との関係を示す図である。以下、図面で用いる構成要素の符号や座標軸は、全図面について共通のものを用いるとする。 Embodiments of the present invention will be described below with reference to the drawings.
1-4 is explanatory drawing of the Example of this invention. FIG. 1 is a diagram illustrating a configuration example of a molded transformer in which the present invention is implemented, FIG. 2 is a diagram illustrating a configuration of a portion that accommodates a member for measuring deterioration performance in the mold transformer of FIG. 1, and FIG. The figure which shows the structure of the part which accommodates the temperature-sensitive member for temperature measurement in this mold transformer, FIG. 4 is a figure which shows the relationship between the continuous use temperature of a mold transformer, use time, and a dielectric breakdown voltage. Hereinafter, the same reference numerals and coordinate axes of components used in the drawings are used for all drawings.

図１において、（ａ）は、モールド変圧器の上面構成図、（ｂ）は側面構成図である。図１において、１は、本発明が実施される３相式のモールド変圧器、２ａはモールド樹脂でモールドされて成るモールドコイルとしてのＵ相の高圧（１次コイル）コイル、２ｂは同じくＶ相の高圧コイル、２ｃは同じくＷ相の高圧コイル、３ａは同じくＵ相の低圧コイル（２次コイル）、３ｂは同じくＶ相の低圧コイル、３ｃは同じくＷ相の低圧コイル、４ａ１は、Ｕ相の低圧コイル３ａ内に設けられ劣化性能測定用部材を収納する孔、４ａ２は、Ｕ相の低圧コイル３ａ内に設けられ感温部材を収納する孔、４ｂ１は、Ｖ相の低圧コイル３ｂ内に設けられ劣化性能測定用部材を収納する孔、４ｂ２は、Ｖ相の低圧コイル３ｂ内に設けられ感温部材を収納する孔、４ｃ１は、Ｗ相の低圧コイル３ｃ内に設けられ劣化性能測定用部材を収納する孔、４ｃ２は、Ｗ相の低圧コイル３ｃ内に設けられ感温部材を収納する孔、５は変圧器金具、６ａはＵ相の低圧コイル端子、８ａはＵ相コイルのタップカバー、８ｂはＶ相コイルのタップカバー、８ｃはＷ相コイルのタップカバー、１１ａは、孔４ａ１内に着脱可能に装着された劣化性能測定用部材としての絶縁材である。絶縁材１１ａとしては、低圧コイル３ａ、３ｂ、３ｃのそれぞれまたは高圧コイル２ａ、２ｂ、２ｃのそれぞれのコイル導体の層間に用いられている絶縁材と同じ材料特性のものを用いる。絶縁材は、孔４ａ１、４ｂ１、４ｃ１のうちの一部のものに対し装着してもよいし、全部に対し装着してもよい。 In FIG. 1, (a) is a top surface block diagram of a mold transformer, and (b) is a side surface block diagram. In FIG. 1, 1 is a three-phase mold transformer in which the present invention is implemented, 2a is a U-phase high-voltage (primary coil) coil as a molded coil formed by molding resin, and 2b is also a V-phase. high pressure coil, 2c are also W-phase high pressure coil, 3a are also low pressure coil of U-phase (secondary coil), a low pressure coil 3b is also V-phase, 3c is likewise low W-phase coils, 4a 1 is, U A hole provided in the phase low voltage coil 3a for accommodating the member for measuring deterioration performance, 4a 2 is a hole provided in the U phase low voltage coil 3a for accommodating the temperature sensitive member, and 4b 1 is a V phase low voltage coil. 4b 2 is provided in the V-phase low voltage coil 3b and 4c 1 is provided in the W-phase low voltage coil 3c. Stores deterioration measurement materials Hole, 4c 2 has a hole for accommodating the provided temperature sensing member into the low pressure coil 3c of the W-phase, the transformer bracket 5, 6a is a low pressure coil terminals of U phase, 8a tap cover of U-phase coil, 8b is tap cover of the V-phase coil, 8c tap cover of the W-phase coil, 11a is an insulating material as a detachably loaded degraded performance measuring member into the hole 4a 1. As the insulating material 11a, a material having the same material characteristics as the insulating material used between the respective coil conductors of the low voltage coils 3a, 3b, 3c or the high voltage coils 2a, 2b, 2c is used. The insulating material may be attached to some or all of the holes 4a 1 , 4b 1 , 4c 1 .

上記構成において、モールド変圧器１が運転状態にされると、孔４ａ１、４ｂ１、４ｃ１、４ａ２、４ｂ２、４ｃ２では、各モールドコイル内でコイル導体の層間と略同じ熱状態が形成され、該孔に装着された絶縁材は、該コイル導体の層間の絶縁材と略同じ加熱状態にされる。このため、該孔に装着された絶縁材は、該コイル導体の層間の絶縁材と略同じ状態で劣化が進行することになる。該コイル導体の層間の絶縁材の劣化は、該コイル導体及び該絶縁材で構成されるモールドコイルの劣化を意味し、該モールドコイルの劣化は、該モールドコイルを用いて成るモールド変圧器の劣化を意味する。このため、上記孔に装着された絶縁材を、モールド変圧器１は運転状態のままで、該孔から取り出して劣化状態を測定することにより、モールドコイルの劣化すなわちモールド変圧器１の劣化状態を診断する。孔４ａ１、４ｂ１、４ｃ１、４ａ２、４ｂ２、４ｃ２はそれぞれ、コイルの外周部の近傍に設けられる。 In the above configuration, when the mold transformer 1 is in an operating state, the holes 4a 1 , 4b 1 , 4c 1 , 4a 2 , 4b 2 , and 4c 2 have substantially the same thermal state as the coil conductor layers in each mold coil. The insulating material attached to the hole is brought into a heating state substantially the same as the insulating material between the coil conductor layers. For this reason, the deterioration of the insulating material attached to the hole progresses in substantially the same state as the insulating material between the layers of the coil conductor. The deterioration of the insulating material between the coil conductor layers means the deterioration of the molded coil composed of the coil conductor and the insulating material, and the deterioration of the molded coil is the deterioration of the molded transformer using the molded coil. Means. For this reason, the insulating material mounted in the hole is taken out from the hole while the mold transformer 1 is in an operating state, and the deterioration state is measured to determine the deterioration of the mold coil, that is, the deterioration state of the mold transformer 1. Diagnose. The holes 4a 1 , 4b 1 , 4c 1 , 4a 2 , 4b 2 , 4c 2 are each provided in the vicinity of the outer periphery of the coil.

図２は、図１のモールド変圧器１において、劣化性能測定用部材としての絶縁材１１ａを収納する孔４ａ１とその周囲の構成を示す図である。
図２において、７は、モールドコイルを貫通してモールド変圧器１の環状の磁気回路を形成するコアである。他の符号は図１の場合と同じである。絶縁材１１ａは、低圧コイル３ａに形成された孔４ａ１内に着脱可能に装着される。該絶縁材１１ａは、直接に孔４ａ１内に装着されてもよいし、または、ケース等に入れられた間接的状態で該孔４ａ１内に装着されてもよい。モールド変圧器１が運転状態にされたとき、Ｕ相の低圧コイル３ａは、該低圧コイル３ａ自体のコイル導体による発熱と、外周側のＵ相の高圧コイル２ａのコイル導体による発熱とにより加熱され、孔４ａ１内の温度は、少なくとも低圧コイル３ａ内部のコイル導体の層間部分の温度と略同じ温度となる。 FIG. 2 is a diagram showing a configuration of the hole 4a 1 for housing the insulating material 11a as a member for measuring deterioration performance and the surroundings in the molded transformer 1 of FIG.
In FIG. 2, reference numeral 7 denotes a core that penetrates the mold coil and forms an annular magnetic circuit of the mold transformer 1. Other reference numerals are the same as those in FIG. Insulating material 11a is detachably mounted in a bore 4a 1 formed in a low pressure coil 3a. Insulating material 11a may be mounted directly in the hole 4a in one, or may be mounted in the hole 4a in one indirect state encased like. When the mold transformer 1 is put into operation, the U-phase low-voltage coil 3a is heated by heat generated by the coil conductor of the low-voltage coil 3a itself and by heat generated by the coil conductor of the U-phase high-voltage coil 2a on the outer peripheral side. , the temperature of the hole 4a 1 becomes substantially the same temperature as the temperature of the interlayer portion of the coil conductors of at least inside the low pressure coil 3a.

絶縁材が低圧コイルの孔内に装着された状態のとき、該低圧コイルの感温部材収納用の孔４ａ２、４ｂ２、４ｃ２のうちの一部のものまたは全部に対し、温度測定用の感温部材が装着された状態とされ、該感温部材収納用の孔の温度が検知される。低圧コイル３ａ内において、孔４ａ２における温度と孔４ａ１における温度とは略同じであり、同様に、低圧コイル３ｂ内において、孔４ｂ２における温度と孔４ｂ１における温度とは略同じであり、低圧コイル３ｃ内において、孔４ｃ２における温度と孔４ｃ１における温度とは略同じである。 When the insulating material is mounted in the hole of the low-voltage coil, temperature measurement is performed on some or all of the holes 4a 2 , 4b 2 , and 4c 2 for accommodating the temperature-sensitive member of the low-voltage coil. The temperature sensing member is mounted, and the temperature of the hole for accommodating the temperature sensing member is detected. In the low voltage coil 3a, the temperature in the hole 4a 2 and the temperature in the hole 4a 1 are substantially the same. Similarly, in the low voltage coil 3b, the temperature in the hole 4b 2 and the temperature in the hole 4b 1 are substantially the same. in a low pressure coil 3c, the temperature in the temperature and the hole 4c 1 in the hole 4c 2 are substantially the same.

図３は、図１のモールド変圧器１において、温度測定用の感温部材を収納する孔４ａ２とその周囲の構成を示す図である。
図３において、１２は感温部材、１３は伝熱線、１４ａ、１４ｂは結合部、１５はダイヤル式温度計である。孔４ａ２の温度が感温部材１２により検知され、伝熱線１３を経て結合部１４ａに伝わり、さらにダイヤル式温度計１５の結合部１４ｂを経て該ダイヤル式温度計１５を作動させる。すなわち、孔４ａ２の温度は、感温部材１２に接続されたダイヤル式温度計に表示され監視される。 FIG. 3 is a diagram showing a configuration of the hole 4a 2 for accommodating the temperature sensing member for temperature measurement and the surroundings in the molded transformer 1 of FIG.
In FIG. 3, 12 is a temperature sensitive member, 13 is a heat transfer wire, 14a and 14b are coupling parts, and 15 is a dial type thermometer. The temperature of the hole 4 a 2 is detected by the temperature sensing member 12, is transmitted to the coupling portion 14 a through the heat transfer wire 13, and further operates the dial thermometer 15 through the coupling portion 14 b of the dial thermometer 15. That is, the temperature of the hole 4a 2 is displayed and monitored on a dial thermometer connected to the temperature sensitive member 12.

モールド変圧器１の劣化状態を診断するとき、モールド変圧器１は停止させずにすなわちモールド変圧器１は運転状態のままで、孔４ａ１、４ｂ１、４ｃ１の一部のものまたは全部に装着された劣化性能測定用部材としての絶縁材が、装着されている孔から取り出され、その劣化状態が測定される。劣化状態の測定は、例えば絶縁破壊電圧や引張り強度につき行われる。 When diagnosing the deterioration state of the mold transformer 1, the mold transformer 1 is not stopped, that is, the mold transformer 1 remains in an operating state, and a part or all of the holes 4a 1 , 4b 1 , 4c 1 The attached insulating material as a member for measuring deterioration performance is taken out from the attached hole, and its deterioration state is measured. The measurement of the deterioration state is performed with respect to, for example, a dielectric breakdown voltage or a tensile strength.

図４は、モールド変圧器１の連続使用温度と使用時間と絶縁破壊電圧との関係をシミュレーションにより求めた結果を示す図である。
図４において、モールド変圧器１を高い温度で長時間使用した場合は、モールドコイルのコイル層間の絶縁材の劣化度が高くなるため絶縁破壊電圧が低くなり、低い温度で使用した場合や短時間使用した場合は、モールドコイルのコイル層間の絶縁材の劣化度が低くなるため絶縁破壊電圧が高く維持される。イは、モールド変圧器１を１５年間連続使用した場合のコイル層間の絶縁材の絶縁破壊電圧と連続使用可能な温度との関係を示す特性線、ロは、モールド変圧器１を３０年間連続使用した場合のコイル層間の絶縁材の絶縁破壊電圧と連続使用可能な温度との関係を示す特性線である。例えば、モールド変圧器１を１５５℃の温度で１５年間連続使用した場合は、特性線イから、モールドコイルのコイル層間の絶縁材の絶縁破壊電圧は約７．８ｋＶｒｍｓ（ｐ点）となるが、１５５℃の温度で３０年間連続使用した場合は、特性線ロから、該絶縁材の絶縁破壊電圧は約５．８ｋＶｒｍｓ（ｑ点）となり、１５年連続使用した場合に比べ、絶縁材の劣化がさらに進行して絶縁破壊電圧が約２ｋＶｒｍｓ低下することになる。なお、図４中、絶縁破壊電圧の相対値は、絶縁破壊電圧の初期値を１５ｋＶｒｍｓとしたときのこれに対する百分率値である。 FIG. 4 is a diagram illustrating a result of obtaining the relationship among the continuous use temperature, use time, and dielectric breakdown voltage of the mold transformer 1 by simulation.
In FIG. 4, when the molded transformer 1 is used for a long time at a high temperature, the dielectric breakdown voltage is lowered because the degree of deterioration of the insulating material between the coil layers of the molded coil is increased. When used, the dielectric breakdown voltage is maintained high because the degree of deterioration of the insulating material between the coil layers of the molded coil is reduced. A is a characteristic line showing the relationship between the dielectric breakdown voltage of the insulation between the coil layers and the temperature at which continuous use is possible when the molded transformer 1 is used continuously for 15 years, and b is the continuous use of the molded transformer 1 for 30 years. It is a characteristic line which shows the relationship between the dielectric breakdown voltage of the insulating material between coil layers in the case of having performed, and the temperature which can be used continuously. For example, when the mold transformer 1 is continuously used at a temperature of 155 ° C. for 15 years, the dielectric breakdown voltage of the insulating material between the coil layers of the mold coil is about 7.8 kVrms (p point) from the characteristic line A. When used continuously for 30 years at a temperature of 155 ° C., the dielectric breakdown voltage of the insulating material is about 5.8 kVrms (q point) from the characteristic line (b), and the deterioration of the insulating material is lower than when used continuously for 15 years. The dielectric breakdown voltage further decreases by about 2 kVrms. In FIG. 4, the relative value of the breakdown voltage is a percentage value when the initial value of the breakdown voltage is 15 kVrms.

例えば、モールド変圧器１の製造後１５年後に、孔４ａ１から劣化性能測定用部材としての絶縁材１１ａを取出し、その絶縁破壊電圧を測定した結果、絶縁破壊電圧が９ｋＶｒｍｓすなわち初期値の６０％であったとすると、この場合の絶縁破壊電圧の経時変化量は４０％であり、特性線イで示される連続使用温度１５５℃の場合（７．８ｋＶｒｍｓ（初期値の５３％すなわち経時変化量＝４７％））程には絶縁材１１ａの劣化すなわちモールドコイルのコイル層間の絶縁材の劣化は進行していないことになる。すなわち、特性線イを寿命限界としたとき、モールド変圧器１はまだ寿命時期に達していないことになる。劣化が進行しなかったのは、実効的に連続使用温度が１５５℃よりも低温であったことなどに起因する。一方、モールド変圧器１の製造後１５年後に、絶縁材１１ａの絶縁破壊電圧を測定した結果、絶縁破壊電圧が６ｋＶｒｍｓすなわち初期値の４０％であったとすると、経時変化量は６０％であり、特性線イで示される連続使用温度１５５℃の場合の経時変化量は４７％を超えて絶縁材１１ａの劣化すなわちモールドコイルのコイル層間の絶縁材の劣化が進行していることになり、既に、特性線イで示される寿命限界を超え、連続使用温度１５５℃で３０年間使用した場合に近い状態に達していることになる。この場合には、モールドコイルの劣化状態が限界レベルに達しているとする表示または音声などによる報知を行う。 For example, 15 years after the manufacture of the mold transformer 1, the insulation material 11a as a member for measuring deterioration performance is taken out from the hole 4a 1 and the breakdown voltage is measured. As a result, the breakdown voltage is 9 kVrms, that is, 60% of the initial value. In this case, the amount of change over time in the dielectric breakdown voltage is 40%. When the continuous use temperature is 155 ° C. indicated by the characteristic line (a) (7.8 kVrms (53% of the initial value, that is, the amount of change over time = 47). %)), The deterioration of the insulating material 11a, that is, the deterioration of the insulating material between the coil layers of the molded coil has not progressed. That is, when the characteristic line A is set as the life limit, the mold transformer 1 has not yet reached the life time. The reason why the deterioration did not proceed is that the continuous use temperature was effectively lower than 155 ° C. On the other hand, as a result of measuring the dielectric breakdown voltage of the insulating material 11a 15 years after the manufacture of the mold transformer 1, if the dielectric breakdown voltage is 6 kVrms, that is, 40% of the initial value, the change over time is 60%. The amount of change over time at the continuous use temperature 155 ° C. indicated by the characteristic line A exceeds 47%, and the deterioration of the insulating material 11a, that is, the deterioration of the insulating material between the coil layers of the molded coil has already progressed. This means that the life limit indicated by the characteristic line (a) has been exceeded, and the state has reached a state where it has been used for 30 years at a continuous use temperature of 155 ° C. In this case, notification by display or sound that the deterioration state of the mold coil has reached the limit level is performed.

上記実施例によれば、モールド変圧器またはモールドコイルの劣化診断時に、劣化性能測定用部材としての絶縁材のみをモールドコイルの孔から取り出して測定を行うことで該劣化診断を行うことができるため、モールド変圧器の運転を停止させずにかつ容易に該診断を行うことができる。また、劣化性能測定用部材としての絶縁材は、上記モールドコイルの孔に着脱可能に装着することで、コイル層間の絶縁材と同様の熱環境内に置くことができ、該コイル層間の絶縁材と略同じ状態で劣化を進行させることができるため、正確な該劣化診断を行うことができる。   According to the above embodiment, at the time of deterioration diagnosis of the mold transformer or the mold coil, the deterioration diagnosis can be performed by taking out only the insulating material as the member for measuring deterioration performance from the hole of the mold coil and performing the measurement. The diagnosis can be easily performed without stopping the operation of the mold transformer. Moreover, the insulating material as a member for measuring deterioration performance can be placed in the same thermal environment as the insulating material between the coil layers by being detachably attached to the hole of the mold coil. Since the deterioration can be advanced in substantially the same state as the above, accurate deterioration diagnosis can be performed.

本発明が実施されるモールド変圧器の構成例である。It is a structural example of the mold transformer by which this invention is implemented. 図１のモールド変圧器において劣化性能測定用部材を収納する部分の構成を示す図である。It is a figure which shows the structure of the part which accommodates the member for degradation performance measurement in the mold transformer of FIG. 図１のモールド変圧器において温度測定用の感温部材を収納する部分の構成を示す図である。It is a figure which shows the structure of the part which accommodates the temperature-sensitive member for temperature measurement in the mold transformer of FIG. モールド変圧器の連続使用温度と使用時間と絶縁破壊電圧との関係を示す図である。It is a figure which shows the relationship between the continuous use temperature of a mold transformer, use time, and a dielectric breakdown voltage.

符号の説明Explanation of symbols

１…モールド変圧器、
２ａ、２ｂ、２ｃ…高圧コイル、
３ａ、３ｂ、３ｃ…低圧コイル、
４ａ１、４ａ２、４ｂ１、４ｂ２、４ｃ１、４ｃ２…孔、
５…変圧器金具、
６ａ…低圧コイル端子、
７…コア、
８ａ、８ｂ、８ｃ…タップカバー、
１１ａ…絶縁材、
１２…感温部材、
１３…伝熱線、
１４ａ、１４ｂ…結合部、
１５…ダイヤル式温度計。
1 ... Mold transformer,
2a, 2b, 2c ... high voltage coil,
3a, 3b, 3c ... low voltage coil,
4a 1 , 4a 2 , 4b 1 , 4b 2 , 4c 1 , 4c 2 ... hole,
5 ... Transformer fittings,
6a ... low voltage coil terminal,
7 ... Core,
8a, 8b, 8c ... tap cover,
11a: insulating material,
12 ... temperature sensitive member,
13 ... Heat transfer wire,
14a, 14b ... coupling part,
15 ... Dial type thermometer.

Claims (4)

モールド変圧器の劣化診断方法であって、
劣化性能測定用部材をモールドコイル中に着脱可能に装着する第１のステップと、
上記劣化性能測定用部材を上記モールドコイルから取り出し、その絶縁性能を測定し、該測定結果に基づき、上記モールドコイルの劣化状態を判別する第２のステップと、
を備え、モールド変圧器の劣化を診断することを特徴とするモールド変圧器の劣化診断方法。 A method for diagnosing deterioration of a mold transformer,
A first step of detachably mounting a member for measuring deterioration performance in a mold coil;
Taking out the member for measuring deterioration performance from the mold coil, measuring its insulation performance, and determining the deterioration state of the mold coil based on the measurement result;
A deterioration diagnosis method for a mold transformer, comprising: diagnosing deterioration of the mold transformer. 上記第１のステップでは、上記劣化性能測定用部材としての絶縁材を、低圧側のモールドコイルのモールド樹脂中に設けた孔の中に挿入する請求項１に記載のモールド変圧器の劣化診断方法。   2. The method for diagnosing deterioration of a molded transformer according to claim 1, wherein in the first step, an insulating material as the member for measuring deterioration performance is inserted into a hole provided in a mold resin of a low-voltage mold coil. . 上記第２のステップでは、上記劣化性能測定用部材の絶縁破壊電圧または引張り強度を測定し、該測定結果から、上記モールドコイルのコイル層間に設けた絶縁材の劣化状態を判断する請求項１に記載のモールド変圧器の劣化診断方法。   In the second step, the breakdown voltage or the tensile strength of the member for measuring deterioration performance is measured, and the deterioration state of the insulating material provided between the coil layers of the mold coil is determined from the measurement result. Deterioration diagnosis method of the described mold transformer. 上記第２のステップでは、上記劣化性能測定用部材の絶縁破壊電圧または引張り強度の経時変化量を求め、該経時変化量を基準値と比較し、該比較の結果、該経時変化量が基準値を超える場合に、上記モールドコイルの劣化状態が限界レベルに達しているとする表示または報知を行う請求項１に記載のモールド変圧器の劣化診断方法。
In the second step, the amount of change over time of the dielectric breakdown voltage or tensile strength of the member for measuring deterioration performance is obtained, the amount of change over time is compared with a reference value, and as a result of the comparison, the amount of change over time is a reference value. The deterioration diagnosis method for a mold transformer according to claim 1, wherein the deterioration diagnosis method of the mold coil indicates or notifies that the deterioration state of the mold coil has reached a limit level.
JP2006107203A 2006-04-10 2006-04-10 Method for diagnosing deterioration of molded transformer Pending JP2007281275A (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008294363A (en) * 2007-05-28 2008-12-04 Mitsubishi Electric Corp Resin molded transformer
KR101068552B1 (en) 2010-05-31 2011-09-28 한국전력공사 An apparatus for evaluating the aging degradation of power transformer insulation papers
JP2012225797A (en) * 2011-04-20 2012-11-15 Daihen Corp Winding temperature measuring device of mold transformer
KR101639579B1 (en) * 2016-06-17 2016-07-22 제룡전기 주식회사 Manufacturing method of dry type transformer for outdoor and dry type transformer for outdoor manufactured using the method
JP2016225379A (en) * 2015-05-28 2016-12-28 株式会社日立産機システム Method and device for diagnosing remaining life of transformer

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0273611A (en) * 1988-09-09 1990-03-13 Hitachi Ltd Molded transformer with deterioration diagnosing device
JP2001185424A (en) * 1999-12-24 2001-07-06 Toshiba Corp High voltage equipment

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0273611A (en) * 1988-09-09 1990-03-13 Hitachi Ltd Molded transformer with deterioration diagnosing device
JP2001185424A (en) * 1999-12-24 2001-07-06 Toshiba Corp High voltage equipment

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008294363A (en) * 2007-05-28 2008-12-04 Mitsubishi Electric Corp Resin molded transformer
KR101068552B1 (en) 2010-05-31 2011-09-28 한국전력공사 An apparatus for evaluating the aging degradation of power transformer insulation papers
JP2012225797A (en) * 2011-04-20 2012-11-15 Daihen Corp Winding temperature measuring device of mold transformer
JP2016225379A (en) * 2015-05-28 2016-12-28 株式会社日立産機システム Method and device for diagnosing remaining life of transformer
KR101639579B1 (en) * 2016-06-17 2016-07-22 제룡전기 주식회사 Manufacturing method of dry type transformer for outdoor and dry type transformer for outdoor manufactured using the method
WO2017217601A1 (en) * 2016-06-17 2017-12-21 제룡전기 주식회사 Method for manufacturing outdoor dry-type transformer, and outdoor dry-type transformer manufactured using same

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