JP2008124146A - Method and apparatus for estimating degradation level of oil-filled electric equipment - Google Patents
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本発明は油入電気機器の劣化度推定方法およびその装置に関するものである。 The present invention relates to a method and an apparatus for estimating a deterioration level of an oil-filled electrical device.
油入電気機器の劣化の程度は、油入電気機器に使用されている絶縁紙の劣化程度で推定される。すなわち、絶縁紙の劣化程度は抗張力や重合度などの機械強度指標で評価することができる。ただし、油入電気機器の絶縁紙の機械強度を測定するには、油入電気機器を停止し、油入電気機器内から絶縁紙の試料を採取して測定する必要があるが、作業性やコスト面を考えると現実的ではない。このため、絶縁油中の成分分析によって絶縁紙の劣化程度を評価するという方法が用いられている。その例として、絶縁紙の劣化に伴い絶縁油中に生じる絶縁油中のCO+CO2(一酸化炭素と二酸化炭素の和)や、フルフラールから絶縁紙の劣化程度を評価して、油入電気機器の劣化度の推定が行われている(特許文献1)。 The degree of deterioration of oil-filled electrical equipment is estimated by the degree of deterioration of insulating paper used in oil-filled electrical equipment. That is, the degree of deterioration of the insulating paper can be evaluated by a mechanical strength index such as tensile strength and degree of polymerization. However, in order to measure the mechanical strength of insulation paper for oil-filled electrical equipment, it is necessary to stop the oil-filled electrical equipment and collect and measure a sample of insulation paper from within the oil-filled electrical equipment. It is not realistic considering the cost. For this reason, a method of evaluating the degree of deterioration of insulating paper by component analysis in insulating oil is used. As an example, we evaluated the degree of deterioration of insulating paper from CO + CO 2 (sum of carbon monoxide and carbon dioxide) in insulating oil generated in insulating oil due to deterioration of insulating paper, and furfural. The degree of deterioration is estimated (Patent Document 1).
また、絶縁紙の劣化の程度は、油入電気機器の使用状態での温度が高いほど劣化しやすく、温度が低いほど劣化し難い。油入電気機器の使用時の温度は、油入電気機器の負荷状態に依存し、高負荷になるほど温度が高くなる。また、油入電気機器を同じ温度で運転している場合には、運転時間が長くなればなるほど絶縁紙は劣化する。従って、油入電気機器運転時間や、運転中に絶縁紙が経験する温度を考慮して絶縁紙の劣化度合いを求めるものも提案されている(特許文献2)。
本発明者らは、実際に所定期間適正に使用されて交換された油入電気機器から、絶縁油中のCO+CO2や、フルフラールを測定するとともに、絶縁紙を採取し、その重合度を測定した。その結果、絶縁油中のCO+CO2や、フルフラールと、絶縁紙の重合度の関係は、絶縁油中のCO+CO2やフルフラールの測定値が大きいと、絶縁紙の重合度が低いという一定の相関関係が見られるが、油入電気機器によってばらつきがある。このため、斯かる相関関係のみを考慮して、絶縁油中のCO+CO2やフルフラールの測定値から、油入電気機器の劣化度を推定した場合には、その精度が悪い。その結果、油入電気機器の交換時期の判断が正確に行えず、まだ十分に使える機器までも交換されている場合がある。運転中に絶縁紙が経験する温度を考慮する場合についても、劣化度を推定するのにどのように考慮するかについてはさらに改良すべき余地がある。 The inventors of the present invention measured CO + CO 2 and furfural in insulating oil from oil-filled electrical equipment that was actually used and replaced properly for a predetermined period of time, collected insulating paper, and measured its degree of polymerization. . As a result, the insulating CO + CO 2 and in the oil, and furfural, the relationship between insulating paper degree of polymerization is large measure of CO + CO 2 and furfural in insulating oil, certain correlation is low polymerization degree of the insulating paper Is seen, but varies depending on the oil-filled electrical equipment. For this reason, in consideration of only such a correlation, when the degree of deterioration of the oil-filled electrical device is estimated from the measured values of CO + CO 2 and furfural in the insulating oil, the accuracy is poor. As a result, it may not be possible to accurately determine when to replace oil-filled electrical equipment, and equipment that is still fully usable may be replaced. Even when the temperature experienced by the insulating paper during operation is taken into account, there is room for further improvement in how to consider the degree of deterioration.
本発明に係る油入電気機器の劣化度推定方法は、予め、油入電気機器の絶縁油中の劣化生成物量と、油入電気機器に掛けた負荷を経時的に積算した負荷積算量と、絶縁紙の機械強度指標のデータに基づいて、劣化生成物量の所定の範囲毎に、負荷積算量と絶縁紙の機械強度指標との相関関係データを作成し、劣化度を推定する対象油入電気機器の絶縁油から測定された劣化生成物量に基づいて、対象油入電気機器の劣化度を推定するのに使用する負荷積算量と平均重合度との相関関係データを選択し、選択した負荷積算量と絶縁紙の機械強度指標との相関関係データに基づいて、測定された対象油入電気機器の負荷積算量から絶縁紙の機械強度指標の推定値を求め、絶縁紙の機械強度指標の推定値に基づいて対象油入電気機器の劣化度を推定することを特徴としている。 The method of estimating the degree of deterioration of oil-filled electrical equipment according to the present invention includes, in advance, the amount of degradation products in the insulating oil of the oil-filled electrical equipment, and the load integrated amount obtained by integrating the load applied to the oil-filled electrical equipment over time, Based on the data on the mechanical strength index of insulating paper, create correlation data between the load integrated amount and the mechanical strength index of insulating paper for each predetermined range of the amount of degradation products, and estimate the degree of degradation Based on the amount of degradation products measured from the insulation oil of the equipment, select correlation data between the load accumulation amount and average polymerization degree used to estimate the degree of degradation of the target oil-filled electrical equipment, and select the load accumulation Based on the correlation data between the quantity and the mechanical strength index of the insulating paper, the estimated value of the mechanical strength index of the insulating paper is obtained from the measured load integrated quantity of the target oil-filled electrical equipment, and the mechanical strength index of the insulating paper is estimated. Estimate the degree of degradation of the target oil-filled electrical equipment based on the value It is characterized in Rukoto.
この油入電気機器の劣化度推定方法によれば、劣化生成物量の所定の範囲毎に、負荷積算量と絶縁紙の機械強度指標との相関関係データを作成し、劣化度を推定する対象油入電気機器の絶縁油から測定された劣化生成物量に基づいて、対象油入電気機器の劣化度を推定するのに使用する負荷積算量と平均重合度との相関関係データを選択して、測定された対象油入電気機器の負荷積算量から絶縁紙の機械強度指標の推定値を求めているので、油入電気機器の劣化度をより精度よく推定することができる。 According to this method for estimating the degree of deterioration of oil-filled electrical equipment, for each predetermined range of the amount of deteriorated product, correlation data between the load integrated amount and the mechanical strength index of insulating paper is created, and the target oil for estimating the degree of deterioration Based on the amount of degradation products measured from the insulating oil of the input electrical equipment, select the correlation data between the integrated load amount used to estimate the degree of degradation of the target oil-filled electrical equipment and the average degree of polymerization, and measure Since the estimated value of the mechanical strength index of the insulating paper is obtained from the load integrated amount of the target oil-filled electrical device, the degree of deterioration of the oil-filled electrical device can be estimated with higher accuracy.
以下、本発明の一実施形態に係る油入電気機器の劣化度推定方法およびその装置を図面に基づいて説明する。 Hereinafter, an oil-filled electrical equipment deterioration degree estimation method and apparatus according to an embodiment of the present invention will be described with reference to the drawings.
この油入電気機器の劣化度推定方法は、予め、油入電気機器の絶縁油中の劣化生成物量と、油入電気機器に掛けた負荷を経時的に積算した負荷積算量と、絶縁紙の機械強度指標のデータに基づいて、劣化生成物量の所定の範囲毎に、負荷積算量と絶縁紙の機械強度指標との相関関係データを作成する。 This method of estimating the degree of deterioration of oil-filled electrical equipment is based on the amount of degradation products in the insulation oil of oil-filled electrical equipment, the load accumulated amount obtained by integrating the load applied to the oil-filled electrical equipment over time, and the insulation paper Based on the data of the mechanical strength index, correlation data between the load integrated amount and the mechanical strength index of the insulating paper is created for each predetermined range of the degradation product amount.
絶縁油中の劣化生成物には、例えば、絶縁油中の(CO+CO2)や、フルフラールや、アセトンなどが含まれる。これらの生成物は、絶縁紙の劣化に因果関係がある生成物であり、比較的精度良く測定でき、同時に絶縁油中の生成物の量と絶縁紙の機械強度との間に、一定の相関関係が認められるものである。なお、絶縁油中の劣化生成物は上述したものに限定されない。また、絶縁油中の劣化生成物量は、異なる種類の油入電気機器についても相対評価が可能となるように、油入電気機器に含まれる絶縁紙の総重量に対する相対的な量を用いるとよい。なお、同じ種類の油入電気機器について劣化度を評価する場合には、絶縁油中の劣化生成物量は、絶対量を用いて評価しても良い。 Examples of the degradation product in the insulating oil include (CO + CO 2 ), furfural, and acetone in the insulating oil. These products are causal to the deterioration of the insulating paper and can be measured with relatively high accuracy. At the same time, there is a certain correlation between the amount of product in the insulating oil and the mechanical strength of the insulating paper. The relationship is recognized. In addition, the degradation product in insulating oil is not limited to what was mentioned above. The amount of degradation product in the insulating oil may be a relative amount with respect to the total weight of the insulating paper contained in the oil-filled electrical device so that relative evaluation is possible for different types of oil-filled electrical devices. . In addition, when evaluating a deterioration degree about the same kind of oil-filled electric equipment, you may evaluate the amount of deterioration products in insulating oil using an absolute amount.
この実施形態では、劣化生成物としてのCO+CO2(一酸化炭素と二酸化炭素の和)の生成量を、絶縁紙の総重量に対して相対評価したデータを用いている。具体的には、まず、油入電気機器から絶縁油の試料を取り出し、絶縁油の単位量(例えば、1リットル)中に含まれるCO+CO2の量を測定する。そして、油入電気機器の絶縁油の量を積算し、油入電気機器の絶縁油に含まれるCO+CO2の総量の推定値を得る。次に、これら劣化生成物量は油入電気機器に用いられている絶縁紙やプレスボードなど、絶縁油中に浸漬している紙の量に起因しているため、CO+CO2の総量の推定値を絶縁油中に浸漬している紙の総重量で割っている。これにより、絶縁油中に浸漬した紙の単位重量当りのCO+CO2の生成量の推定値を算出している。 In this embodiment, data obtained by relative evaluation of the amount of CO + CO 2 (sum of carbon monoxide and carbon dioxide) as a degradation product with respect to the total weight of the insulating paper is used. Specifically, first, a sample of insulating oil is taken out from the oil-filled electrical device, and the amount of CO + CO 2 contained in a unit amount (for example, 1 liter) of insulating oil is measured. Then, the amount of the insulating oil of the oil-filled electrical device is integrated to obtain an estimated value of the total amount of CO + CO 2 contained in the insulating oil of the oil-filled electrical device. Next, since the amount of these degradation products is due to the amount of paper immersed in insulating oil, such as insulating paper and pressboard used in oil-filled electrical equipment, the estimated value of the total amount of CO + CO 2 is calculated. Divide by the total weight of paper immersed in insulating oil. Thereby, the estimated value of the amount of CO + CO 2 produced per unit weight of the paper immersed in the insulating oil is calculated.
次に、絶縁紙の機械強度指標には、例えば、平均重合度や抗張力を用いると良い。いずれも絶縁紙の劣化度合いを測る指標となる。この実施形態では、絶縁紙の機械強度指標として平均重合度を用いている。 Next, for example, an average degree of polymerization or tensile strength may be used as the mechanical strength index of the insulating paper. Both are indicators for measuring the degree of deterioration of insulating paper. In this embodiment, the average degree of polymerization is used as a mechanical strength index of insulating paper.
油入電気機器に掛けた負荷を経時的に積算した負荷積算量は、絶縁紙の劣化を進める要因の一つである油入電気機器の発熱量の経時的な積算量に相当する量である。ここでは、便宜上、例えば、油入電気機器の負荷率を用いて算出している。負荷率は、油入電気機器の定格容量に対する運転時の負荷の割合である。例えば、油入変圧器では、負荷損は、負荷率の略2乗に比例することが知られている(大岡登、前川定雄著、『変圧器』、初版、東京電機大学出版局、P169など)。また、巻線の最高点温度上昇は、負荷率の略1.6乗に比例することが知られている(電気学会技術報告、(I部)第143号、油入変圧器運転指針、変圧器信頼性調査専門委員会、社団法人電気学会、P16など)。このため、この実施形態では、油入電気機器の発熱特性を考慮して、負荷率を2乗したものに巻線最高点温度上昇値を乗じたものを経時的に積算した量〔Σ{(負荷率)2×巻線最高点温度上昇値}〕や、負荷率を1.6乗したものに巻線最高点温度上昇値を乗じたものを経時的に積算した量〔Σ{(負荷率)1.6×巻線最高点温度上昇値}〕を負荷積算量として用いている。なお、負荷率を2乗したものを経時的に積算した量〔Σ(負荷率)2〕や、負荷率を1.6乗したものを経時的に積算した量〔Σ(負荷率)1.6〕を負荷積算量として用いてもよい。 The load integrated amount obtained by integrating the load applied to the oil-filled electrical equipment over time is an amount equivalent to the cumulative amount of heat generation of the oil-filled electrical equipment over time, which is one of the factors that promote the deterioration of insulating paper. . Here, for convenience, for example, the calculation is performed using the load factor of the oil-filled electrical device. The load factor is the ratio of the load during operation to the rated capacity of the oil-filled electrical device. For example, in oil-filled transformers, the load loss is known to be proportional to the square of the load factor (Noboru Ooka, Sadao Maekawa, “Transformer”, first edition, Tokyo Denki University Press, P169, etc. ). In addition, the highest point temperature rise of the winding is known to be proportional to approximately 1.6th power of the load factor (Institute of Electrical Engineers Technical Report (Part I) No. 143, Oil-filled Transformer Operation Guidelines, Transformer Instrument reliability survey committee, Institute of Electrical Engineers of Japan, P16, etc.). Therefore, in this embodiment, in consideration of the heat generation characteristics of the oil-filled electrical device, an amount obtained by multiplying a value obtained by multiplying the square of the load factor by the winding maximum point temperature rise value [Σ {( Load factor) 2 × winding maximum point temperature rise value}] or the amount obtained by multiplying the load factor multiplied by 1.6 to the winding maximum point temperature rise value over time [Σ {(load factor ) 1.6 x Winding maximum point temperature rise value}] is used as the integrated load. In addition, the amount [Σ (load factor) 2 ] obtained by integrating the square of the load factor with time [Σ (load factor) 2 ] or the amount obtained by integrating the load factor 1.6 with time [Σ (load factor) 1. 6 ] may be used as the load integrated amount.
次に、油入電気機器の劣化度を推定するのに用いる負荷積算量と絶縁紙の機械強度指標との相関関係データを作成する。斯かる相関関係データは、測定された絶縁油中の劣化生成物量に応じて、所定の範囲毎のグループに分けられ、分けられたグループ毎に作成する。 Next, correlation data between the load integrated amount used for estimating the deterioration degree of the oil-filled electrical device and the mechanical strength index of the insulating paper is created. Such correlation data is divided into groups for each predetermined range according to the measured deterioration product amount in the insulating oil, and is created for each divided group.
斯かる油入電気機器の劣化度を推定するのに用いる負荷積算量と絶縁紙の機械強度指標との相関関係データを作成する際は、例えば、実際に所定期間適正に使用されて交換された油入電気機器から得られるデータに基づいて作成するとよい。 When creating correlation data between the load integrated amount used to estimate the deterioration degree of such oil-filled electrical equipment and the mechanical strength index of insulating paper, for example, it was actually used properly for a predetermined period and replaced It may be created based on data obtained from oil-filled electrical equipment.
絶縁油中の劣化生成物量や絶縁紙の機械強度指標は、例えば、実際に所定期間適正に使用されて交換された油入電気機器から試料を採って測定するとよい。また、油入電気機器に掛けた負荷を経時的に積算した負荷積算量は、例えば、油入電気機器の使用状況を記録した履歴データから算出するとよい。具体的には、変電所などに用いられている油入変圧器で、単位時間毎の負荷率の変位や月間負荷率などを時系列に記録されている場合には、この履歴データを用いて油入電気機器に掛けた負荷を経時的に積算するとよく、比較的容易に算出できる。 The deterioration product amount in the insulating oil and the mechanical strength index of the insulating paper may be measured, for example, by taking a sample from an oil-filled electrical device that has been actually used and replaced properly for a predetermined period of time. Further, the load integrated amount obtained by integrating the load applied to the oil-filled electrical device over time may be calculated from, for example, history data that records the usage status of the oil-filled electrical device. Specifically, in oil-filled transformers used in substations, etc., when the load factor displacement and monthly load factor per unit time are recorded in time series, this history data is used. The load applied to the oil-filled electrical device may be integrated over time and can be calculated relatively easily.
この実施形態では、実際に所定期間適正に使用されて交換された複数台の油入電気機器から試料を採取し、油入電気機器の絶縁油中のCO+CO2の生成量(厳密には、絶縁油に浸漬した紙の単位重量当たりから生成されるCO+CO2の量であるが、以下、単に「生成量」という。)および絶縁紙の平均重合度を測定している。また、各油入電気機器の使用状態の履歴データから、それぞれΣ{(時間負荷率)2×巻線最高点温度上昇値}を算出している。図1は、実際に所定期間適正に使用されて交換された複数台の油入電気機器についてCO+CO2の生成量と平均重合度の関係を示す図である。 In this embodiment, samples are collected from a plurality of oil-filled electrical devices that have been used and replaced properly for a predetermined period of time, and the amount of CO + CO 2 generated in the insulating oil of the oil-filled electrical device (strictly speaking, insulation The amount of CO + CO 2 produced from the unit weight of the paper immersed in oil is hereinafter simply referred to as “production amount”) and the average degree of polymerization of the insulating paper is measured. Also, Σ {(time load factor) 2 × winding maximum point temperature rise value} is calculated from the history data of the usage state of each oil-filled electrical device. FIG. 1 is a diagram showing the relationship between the amount of CO + CO 2 produced and the average degree of polymerization for a plurality of oil-filled electrical devices that were actually used and replaced properly for a predetermined period of time.
次に、CO+CO2の生成量に基づいて、データをグループ分け、グループ毎に負荷積算量と絶縁紙の平均重合度の相関関係データを作成する。 Next, based on the amount of CO + CO 2 generated, the data is divided into groups, and correlation data between the load integrated amount and the average polymerization degree of the insulating paper is created for each group.
この実施形態では、上述した複数台の油入電気機器を、CO+CO2の生成量に基づいて、グループ分けする。具体的には、複数台の油入電気機器を、CO+CO2の生成量が、20(ml/Kg)未満のもの、20(ml/Kg)以上30(ml/Kg)未満のもの、30(ml/Kg)以上40(ml/Kg)未満のもの、40(ml/Kg)以上70(ml/Kg)未満のもの、70(ml/Kg)以上110(ml/Kg)未満のもの、110(ml/Kg)以上の6つのグループに分けている。 In this embodiment, the plurality of oil-filled electrical devices described above are grouped based on the amount of CO + CO 2 produced. Specifically, a plurality of oil-filled electrical devices having a CO + CO 2 production amount of less than 20 (ml / Kg), 20 (ml / Kg) or more and less than 30 (ml / Kg), 30 ( ml / Kg) or more and less than 40 (ml / Kg), 40 (ml / Kg) or more and less than 70 (ml / Kg), 70 (ml / Kg) or more and less than 110 (ml / Kg), 110 (Ml / Kg) Divided into 6 groups.
そして、グループ毎にΣ{(時間負荷率)2×巻線最高点温度上昇値}と絶縁紙の平均重合度の相関関係データを作成する。図2はCO+CO2の生成量が20(ml/Kg)未満のグループについてのものであり、図3はCO+CO2の生成量が20(ml/Kg)以上30(ml/Kg)未満のグループについてのものであり、図4はCO+CO2の生成量が30(ml/Kg)以上40(ml/Kg)未満のグループについてのものであり、図5はCO+CO2の生成量が40(ml/Kg)以上60(ml/Kg)未満のグループについてのものであり、図6はCO+CO2の生成量が70(ml/Kg)以上110(ml/Kg)未満のグループについてのものであり、図7はCO+CO2の生成量が110(ml/Kg)以上のグループについてのものである。 Then, for each group, correlation data between Σ {(time load factor) 2 × winding maximum point temperature rise value} and the average degree of polymerization of the insulating paper is created. FIG. 2 is for a group in which the amount of CO + CO 2 produced is less than 20 (ml / Kg), and FIG. 3 is for a group in which the amount of CO + CO 2 produced is 20 (ml / Kg) to less than 30 (ml / Kg). FIG. 4 is for a group in which the production amount of CO + CO 2 is 30 (ml / Kg) or more and less than 40 (ml / Kg), and FIG. 5 is the production amount of CO + CO 2 is 40 (ml / Kg). ) For a group of 60 (ml / Kg) or less and FIG. 6 is for a group in which the amount of CO + CO 2 produced is 70 (ml / Kg) or more and less than 110 (ml / Kg). Is for a group in which the amount of CO + CO 2 produced is 110 (ml / Kg) or more.
このように劣化生成物量の所定の範囲毎に、Σ{(時間負荷率)2×巻線最高点温度上昇値}と絶縁紙の平均重合度との相関関係データを作成することにより、Σ{(時間負荷率)2×巻線最高点温度上昇値}と絶縁紙の平均重合度との相関関係の誤差率を小さくすることができる。従って、この相関関係データを用いて、油入電気機器の劣化度を推定すれば、油入電気機器の劣化度についてより精度の高い判定が行える。この実施形態では、絶縁紙の平均重合度の推定値と実測値の相関関係および誤差平均は、図8に示す通りである。図9は、CO+CO2の生成量と絶縁紙の平均重合度との相関関係から求まる絶縁紙の平均重合度推定値と実測値の相関関係および誤差平均を示す図である。ここで示す誤差平均は、絶縁紙の平均重合度の推定値と実測値との差を、実測値で除した値の平均値である。従って、誤差平均が小さいほど油入電気機器の劣化度の推定誤差が小さいことが示されている。 Thus, by creating correlation data between Σ {(time load factor) 2 × winding highest point temperature rise value} and the average degree of polymerization of the insulating paper for each predetermined range of the degradation product amount, Σ { (Time load factor) The error rate of the correlation between 2 × winding highest point temperature rise value} and the average degree of polymerization of the insulating paper can be reduced. Therefore, if the degree of deterioration of the oil-filled electrical device is estimated using this correlation data, a more accurate determination can be made regarding the degree of degradation of the oil-filled electrical device. In this embodiment, the correlation between the estimated value of the average polymerization degree of the insulating paper and the actually measured value and the error average are as shown in FIG. FIG. 9 is a diagram showing a correlation between an estimated average polymerization degree of insulating paper and an actual measurement value and an error average obtained from a correlation between the amount of CO + CO 2 generated and the average polymerization degree of the insulating paper. The error average shown here is an average value of values obtained by dividing the difference between the estimated value of the average degree of polymerization of the insulating paper and the actually measured value by the actually measured value. Therefore, it is shown that the estimation error of the deterioration degree of the oil-filled electrical device is smaller as the error average is smaller.
次に、劣化度を推定する推定対象となる対象油入電気機器について、劣化度を推定する作業を説明する。斯かる推定作業では、まず、劣化度を推定する対象油入電気機器の絶縁油から測定された劣化生成物量に基づいて、対象油入電気機器の劣化度を推定するのに使用する負荷積算量と平均重合度との相関関係データを選択する。 Next, an operation for estimating the degree of deterioration will be described for the target oil-filled electrical device to be estimated for estimating the degree of deterioration. In such estimation work, first, the load integrated amount used to estimate the degree of deterioration of the target oil-filled electrical device based on the amount of degradation product measured from the insulating oil of the target oil-filled electrical device whose degree of degradation is estimated. And correlation data of average degree of polymerization is selected.
この実施形態では、対象油入電気機器の絶縁油から測定された劣化生成物量(CO+CO2)に基づいて、対象油入電気機器の劣化度を推定するのに使用するΣ{(時間負荷率)2×巻線最高点温度上昇値}と平均重合度との相関関係データを選択する。 In this embodiment, Σ {(time load factor) used to estimate the degree of deterioration of the target oil-filled electrical device based on the amount of degradation product (CO + CO 2 ) measured from the insulating oil of the target oil-filled electrical device. 2 × Correlation data of winding maximum point temperature rise value} and average degree of polymerization are selected.
油入電気機器の劣化度の推定作業では、実際に使用されている油入電気機器を対象に用いることができる。この場合、まず、実際に使用されている油入電気機器から、絶縁油の一部を試料として採取し、そこから劣化生成物量を測定する。この実施形態では、劣化生成物量としてCO+CO2の生成量を用いて、負荷積算量と絶縁紙の平均重合度との相関関係データを作成しているので、CO+CO2の生成量の測定結果を用いる。そして、CO+CO2の生成量の測定結果に基づいて、使用する負荷積算量と平均重合度との相関関係データを選択する。 In the estimation work of the deterioration degree of the oil-filled electrical device, the oil-filled electrical device actually used can be used as a target. In this case, first, a part of the insulating oil is collected as a sample from the oil-filled electrical equipment that is actually used, and the amount of deteriorated product is measured therefrom. In this embodiment, correlation data between the integrated load amount and the average degree of polymerization of the insulating paper is created using the amount of CO + CO 2 produced as the amount of deteriorated product, so the measurement result of the amount of CO + CO 2 produced is used. . Then, based on the measurement result of the CO + CO 2 production amount, correlation data between the load integrated amount to be used and the average polymerization degree is selected.
この実施形態では、CO+CO2の生成量が、20(ml/Kg)未満のもの、20(ml/Kg)以上30(ml/Kg)未満のもの、30(ml/Kg)以上40(ml/Kg)未満のもの、40(ml/Kg)以上70(ml/Kg)未満のもの、70(ml/Kg)以上110(ml/Kg)未満のもの、110(ml/Kg)以上の6つのグループに分けているので、CO+CO2の生成量の測定結果に基づいて、測定結果が含まれるグループを選択するとよい。 In this embodiment, the amount of CO + CO 2 produced is less than 20 (ml / Kg), 20 (ml / Kg) or more and less than 30 (ml / Kg), 30 (ml / Kg) or more and 40 (ml / kg). Kg), 40 (ml / Kg) or more and less than 70 (ml / Kg), 70 (ml / Kg) or more and less than 110 (ml / Kg), 110 (ml / Kg) or more Since it is divided into groups, a group including the measurement result may be selected based on the measurement result of the CO + CO 2 generation amount.
次に、対象油入電気機器の使用履歴データから負荷積算量を算出し、選択した負荷積算量と絶縁紙の機械強度指標との相関関係データに基づいて、測定された油入電気機器の負荷積算量から絶縁紙の機械強度指標の推定値を求める。 Next, calculate the load integrated amount from the usage history data of the target oil-filled electrical device, and measure the load of the oil-filled electrical device measured based on the correlation data between the selected load integrated amount and the mechanical strength index of the insulating paper. The estimated value of the mechanical strength index of insulating paper is obtained from the integrated amount.
この実施形態では、負荷積算量としてΣ{(時間負荷率)2×巻線最高点温度上昇値}を用いているので、対象油入電気機器の使用履歴データからΣ{(時間負荷率)2×巻線最高点温度上昇値}を算出する。そして、算出されたΣ{(時間負荷率)2×巻線最高点温度上昇値}と、選択したΣ{(時間負荷率)2×巻線最高点温度上昇値}と絶縁紙の平均重合度との相関関係データに基づいて、対象油入電気機器の絶縁紙の平均重合度を求める。具体的には、この実施形態では、選択した選択したΣ{(時間負荷率)2×巻線最高点温度上昇値}と絶縁紙の平均重合度との相関関係を示す近似曲線から、対象油入電気機器の絶縁紙の平均重合度を求めている。 In this embodiment, because of the use of sigma {(time load factor) 2 × winding highest point temperature rise value} as the accumulated load amount, the usage history data of the target oil-filled electrical apparatus sigma {(time load factor) 2 X Winding highest point temperature rise value} is calculated. And the calculated Σ {(time load factor) 2 × winding highest point temperature rise value}, selected Σ {(time load factor) 2 × winding highest point temperature rise value} and the average polymerization degree of the insulating paper The average degree of polymerization of the insulating paper of the target oil-filled electrical device is obtained on the basis of the correlation data. Specifically, in this embodiment, the target oil is obtained from an approximate curve indicating the correlation between the selected Σ {(time load factor) 2 × winding highest point temperature rise value} and the average degree of polymerization of the insulating paper. The average degree of polymerization of the insulation paper of the incoming electrical equipment is obtained.
油入電気機器の劣化度は、油入電気機器の絶縁紙の劣化により決まり、絶縁紙の劣化は絶縁紙の機械強度により決まるので、平均重合度や抗張力などの絶縁紙の機械強度指標により、油入電気機器の劣化度を推定することができる。この実施形態では、上述したように、当該対象油入電気機器の使用履歴データから算出されたΣ{(時間負荷率)2×巻線最高点温度上昇値}と、選択したΣ{(時間負荷率)2×巻線最高点温度上昇値}と絶縁紙の平均重合度との相関関係データの相関曲線に基づいて、当該対象油入電気機器の絶縁紙の平均重合度を求めることができ、これから当該油入電気機器の劣化度を推定することができる。 The degree of deterioration of oil-filled electrical equipment is determined by the deterioration of insulation paper in oil-filled electrical equipment, and the deterioration of insulation paper is determined by the mechanical strength of insulation paper. Therefore, according to the mechanical strength index of insulation paper such as average polymerization degree and tensile strength, The degree of deterioration of oil-filled electrical equipment can be estimated. In this embodiment, as described above, Σ {(time load factor) 2 × winding highest point temperature rise value} calculated from the use history data of the target oil-filled electrical device and the selected Σ {(time load Rate) 2 x winding maximum temperature rise value} and the correlation data of the correlation data between the average polymerization degree of the insulating paper, the average polymerization degree of the insulating paper of the target oil-filled electrical equipment can be obtained, From this, the degree of deterioration of the oil-filled electrical device can be estimated.
油入電気機器の絶縁油中の劣化生成物量が同じ程度であれば、油入電気機器が低い負荷で運転されているほど絶縁紙の重合度が大きく(絶縁紙の劣化が小さく)、油入電気機器が高い負荷で運転されているほど絶縁紙の重合度が小さい(絶縁紙の劣化が大きい)。上述した油入電気機器の劣化度推定方法によれば、油入電気機器の劣化度の推定に用いる負荷積算量と絶縁紙の機械強度指標との相関関係データを作成する際に、図1〜図7に示すように、予め、油入電気機器の絶縁油中の劣化生成物量と、油入電気機器に掛けた負荷を経時的に積算した負荷積算量と、絶縁紙の機械強度指標のデータを、劣化生成物量の所定の範囲毎に分け、範囲毎に負荷積算量と絶縁紙の機械強度指標との相関関係データを作成している。このため、劣化生成物量の所定の範囲毎に分け、範囲毎に負荷積算量と絶縁紙の機械強度指標との相関関係データを作成することにより、負荷積算量と絶縁紙の機械強度指標との相関関係の誤差率を小さくすることができる。 If the amount of degradation products in the insulating oil of oil-filled electrical equipment is the same, the degree of polymerization of the insulating paper increases (the deterioration of the insulating paper decreases) as the oil-filled electrical equipment is operated at a lower load. The degree of polymerization of the insulating paper is smaller as the electric device is operated at a higher load (the deterioration of the insulating paper is larger). According to the above-described method for estimating the degree of degradation of oil-filled electrical equipment, when creating correlation data between the load integrated amount used for estimating the degree of degradation of oil-filled electrical equipment and the mechanical strength index of insulating paper, FIG. As shown in FIG. 7, the amount of degradation products in the insulating oil of the oil-filled electrical equipment, the load accumulated amount obtained by integrating the load applied to the oil-filled electrical equipment over time, and the mechanical strength index data of the insulating paper Is divided into predetermined ranges of the amount of deteriorated products, and correlation data between the load integrated amount and the mechanical strength index of the insulating paper is created for each range. For this reason, the degradation product amount is divided into predetermined ranges, and by creating correlation data between the load integrated amount and the mechanical strength index of the insulating paper for each range, the load integrated amount and the mechanical strength index of the insulating paper are The error rate of the correlation can be reduced.
そして、対象油入電気機器の劣化度を推定する際も、対象油入電気機器の絶縁油から測定された劣化生成物量に基づいて、使用する負荷積算量と平均重合度との相関関係データを選択し、選択した負荷積算量と絶縁紙の機械強度指標との相関関係データに基づいて、測定された対象油入電気機器の負荷積算量から絶縁紙の機械強度指標の推定値を求め、この絶縁紙の機械強度指標の推定値に基づいて対象油入電気機器の劣化度を推定するようにしたので、対象油入電気機器の劣化度をより精度よく推定することができる。 And when estimating the deterioration degree of the target oil-filled electrical equipment, the correlation data between the load integrated amount to be used and the average polymerization degree is obtained based on the amount of degradation products measured from the insulating oil of the target oil-filled electrical equipment. Based on the correlation data between the selected load integrated amount and the mechanical strength index of the insulating paper, the estimated value of the mechanical strength index of the insulating paper is obtained from the measured load integrated amount of the target oil-filled electrical device. Since the degree of degradation of the target oil-filled electrical device is estimated based on the estimated value of the mechanical strength index of the insulating paper, the degree of degradation of the target oil-filled electrical device can be estimated more accurately.
これにより、油入電気機器を寿命により交換する際に交換時期を判断する場合において、より正確に油入電気機器の劣化度を判断でき、より適切な時期に油入電気機器を交換することができる。 This makes it possible to more accurately determine the degree of deterioration of the oil-filled electrical device when replacing the oil-filled electrical device due to its life, and to replace the oil-filled electrical device at a more appropriate time. it can.
以上、本発明の一実施形態に係る油入電気機器の劣化度推定方法を説明したが、本発明に係る油入電気機器の劣化度推定方法は上記実施形態に限定されるものではない。 The oil-filled electrical equipment deterioration level estimation method according to an embodiment of the present invention has been described above. However, the oil-filled electrical equipment degradation level estimation method according to the present invention is not limited to the above-described embodiment.
例えば、上記実施形態では、負荷積算量としてΣ{(時間負荷率)2×巻線最高点温度上昇値}を採用したが、これに限らず、日単位や、月単位で負荷率のデータがある場合には、斯かる時間を基準に経時的な積算量を算出するとよい。また、負荷積算量は、負荷率を2乗したものを経時的に積算した量〔Σ(負荷率)2〕や、負荷率を1.6乗したものを経時的に積算した量〔Σ(負荷率)1.6〕を用いてもよい。 For example, in the above-described embodiment, Σ {(time load factor) 2 × winding maximum point temperature rise value} is adopted as the load integrated amount. However, the present invention is not limited to this, and load factor data is obtained on a daily or monthly basis. In some cases, the integrated amount over time may be calculated based on such time. Also, the load integrated amount is an amount obtained by integrating the load factor squared over time [Σ (load factor) 2 ], or an amount obtained by integrating the load factor raised to 1.6 power [Σ ( (Load factor) 1.6 ] may be used.
また、劣化生成物量は、絶縁油中の(CO+CO2)の他、フルフラールやアセトンを用いてもよい。また、絶縁紙の機械強度指標には、絶縁紙の平均重合度の他、抗張力を用いてもよい。 In addition, the amount of degradation products may be furfural or acetone in addition to (CO + CO 2 ) in insulating oil. In addition to the average degree of polymerization of insulating paper, tensile strength may be used as the mechanical strength index of insulating paper.
また、油入電気機器の劣化度推定方法は、所定のプログラムに基づいて演算処理する演算部(CPU)や、相関関係のデータなどを記憶できる記憶部(メモリ)を備えたコンピュータを用いて具現化できる。 In addition, the method of estimating the degree of deterioration of oil-filled electrical equipment is implemented using a computer having a calculation unit (CPU) that performs calculation processing based on a predetermined program and a storage unit (memory) that can store correlation data and the like. Can be
油入電気機器の劣化度推定装置は、例えば、予め、油入電気機器の絶縁油中の劣化生成物量と、油入電気機器に掛けた負荷を経時的に積算した負荷積算量と、絶縁紙の機械強度指標のデータに基づいて、劣化生成物量の所定の範囲毎に作成した、負荷積算量と絶縁紙の機械強度指標との相関関係データを記録した相関関係データ記憶部と、劣化度を推定する対象油入電気機器の絶縁油から測定された劣化生成物量に基づいて、相関関係データ記憶部に記憶された相関関係データから使用する負荷積算量と平均重合度との相関関係データを選択する相関関係データ選択部と、前記選択部において、選択された負荷積算量と絶縁紙の機械強度指標との相関関係データに基づいて、測定された油入電気機器の負荷積算量から絶縁紙の機械強度指標の推定値を求める推定値算出部とを備えた構成とするとよい。 The oil-filled electrical equipment deterioration degree estimation device is, for example, a pre-degraded amount of degradation product in the insulating oil of the oil-filled electrical equipment, a load integrated amount obtained by integrating the load applied to the oil-filled electrical equipment over time, and insulating paper. A correlation data storage unit that records correlation data between the load integrated amount and the mechanical strength index of the insulating paper, created for each predetermined range of the degradation product amount based on the data of the mechanical strength index of Based on the amount of deterioration products measured from the insulation oil of the target oil-filled electrical equipment to be estimated, select correlation data between the accumulated load to be used and the average polymerization degree from the correlation data stored in the correlation data storage unit Correlation data selection unit, and in the selection unit, based on the correlation data between the load integrated amount selected and the mechanical strength index of the insulating paper, the measured load integrated amount of the oil-filled electrical device Mechanical strength index It may be configured to include an estimation value calculation unit for determining the value.
また、この場合、さらに、絶縁紙の機械強度指標の推定値と油入電気機器の劣化度との相関関係を記憶した劣化度相関関係記憶部と、推定値算出部で算出された推定値と、劣化度相関関係記憶部に記憶させた絶縁紙の機械強度指標の推定値と油入電気機器の劣化度との相関関係に基づいて、油入電気機器の劣化度を算出する劣化度算出部を設けてもよい。 Further, in this case, the deterioration degree correlation storage unit that stores the correlation between the estimated value of the mechanical strength index of the insulating paper and the deterioration degree of the oil-filled electrical device, and the estimated value calculated by the estimated value calculation unit Degradation degree calculation unit for calculating the deterioration degree of the oil-filled electrical device based on the correlation between the estimated value of the mechanical strength index of the insulating paper stored in the deterioration degree correlation storage unit and the deterioration degree of the oil-filled electrical device May be provided.
また、この油入電気機器の劣化度推定方法は、油入変圧器の他、油入リアクタンスなどの種々の油入電気機器に適用できる。 In addition, this method of estimating the degree of deterioration of oil-filled electrical equipment can be applied to various oil-filled electrical equipment such as oil-filled reactances in addition to oil-filled transformers.
Claims (5)
劣化度を推定する対象油入電気機器の絶縁油から測定された劣化生成物量に基づいて、対象油入電気機器の劣化度を推定するのに使用する負荷積算量と平均重合度との相関関係データを選択し、
前記選択した負荷積算量と絶縁紙の機械強度指標との相関関係データに基づいて、測定された対象油入電気機器の負荷積算量から絶縁紙の機械強度指標の推定値を求め、前記絶縁紙の機械強度指標の推定値に基づいて前記対象油入電気機器の劣化度を推定することを特徴とする油入電気機器の劣化度推定方法。 Based on the amount of degradation products in the insulating oil of oil-filled electrical equipment, the accumulated load over time of the load applied to the oil-filled electrical equipment, and the data on the mechanical strength index of insulating paper For each predetermined range, create correlation data between the load integrated amount and the mechanical strength index of insulating paper,
Correlation between accumulated load and average polymerization degree used to estimate the degree of degradation of the target oil-filled electrical equipment based on the amount of degradation products measured from the insulation oil of the target oil-filled electrical equipment whose degree of degradation is estimated Select the data
Based on the correlation data between the selected load integrated amount and the mechanical strength index of insulating paper, an estimated value of the mechanical strength index of insulating paper is obtained from the measured load integrated amount of the target oil-filled electrical device, and the insulating paper A degradation degree estimation method for an oil-filled electrical device, wherein the degradation level of the target oil-filled electrical device is estimated based on an estimated value of a mechanical strength index.
劣化度を推定する対象油入電気機器の絶縁油から測定された劣化生成物量に基づいて、相関関係データ記憶部に記憶された相関関係データから使用する負荷積算量と平均重合度との相関関係データを選択する相関関係データ選択部と、
前記選択部において、選択された負荷積算量と絶縁紙の機械強度指標との相関関係データに基づいて、測定された油入電気機器の負荷積算量から絶縁紙の機械強度指標の推定値を求める推定値算出部とを備えたことを特徴とする油入電気機器の劣化度推定装置。 Based on the amount of degradation products in the insulating oil of oil-filled electrical equipment, the accumulated load over time of the load applied to the oil-filled electrical equipment, and the mechanical strength index data of the insulation paper A correlation data storage unit that records correlation data between the load integrated amount and the mechanical strength index of the insulating paper, created for each predetermined range;
Based on the amount of degradation products measured from the insulation oil of the target oil-filled electrical equipment to estimate the degree of degradation, the correlation between the accumulated load used from the correlation data stored in the correlation data storage unit and the average degree of polymerization A correlation data selection unit for selecting data;
In the selection unit, based on the correlation data between the selected load integrated amount and the mechanical strength index of insulating paper, an estimated value of the mechanical strength index of insulating paper is obtained from the measured load integrated amount of oil-filled electrical equipment. An apparatus for estimating the degree of deterioration of an oil-filled electrical device, comprising: an estimated value calculation unit.
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JP2018078211A (en) * | 2016-11-10 | 2018-05-17 | 北芝電機株式会社 | Method of producing natural circulation vegetable oil-immersed transformer |
JP6354042B1 (en) * | 2018-01-18 | 2018-07-18 | 義和 寺上 | Transformer degradation status display device |
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JPS6119106A (en) * | 1984-07-06 | 1986-01-28 | Mitsubishi Electric Corp | Insulator deterioration monitoring device |
JP2003207440A (en) * | 2002-01-11 | 2003-07-25 | Chubu Electric Power Co Inc | Method of measuring degree of degradation of electric insulating paper |
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JPS6119106A (en) * | 1984-07-06 | 1986-01-28 | Mitsubishi Electric Corp | Insulator deterioration monitoring device |
JP2003207440A (en) * | 2002-01-11 | 2003-07-25 | Chubu Electric Power Co Inc | Method of measuring degree of degradation of electric insulating paper |
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JP2018078211A (en) * | 2016-11-10 | 2018-05-17 | 北芝電機株式会社 | Method of producing natural circulation vegetable oil-immersed transformer |
JP6354042B1 (en) * | 2018-01-18 | 2018-07-18 | 義和 寺上 | Transformer degradation status display device |
JP2019125767A (en) * | 2018-01-18 | 2019-07-25 | 義和 寺上 | Transformer deterioration status display device |
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