JP6708939B1 - Oil leak monitor - Google Patents
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- JP6708939B1 JP6708939B1 JP2019035125A JP2019035125A JP6708939B1 JP 6708939 B1 JP6708939 B1 JP 6708939B1 JP 2019035125 A JP2019035125 A JP 2019035125A JP 2019035125 A JP2019035125 A JP 2019035125A JP 6708939 B1 JP6708939 B1 JP 6708939B1
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- 230000005484 gravity Effects 0.000 claims abstract description 32
- 238000012806 monitoring device Methods 0.000 claims abstract description 25
- 230000005540 biological transmission Effects 0.000 claims abstract description 13
- 239000007788 liquid Substances 0.000 claims description 20
- 230000007423 decrease Effects 0.000 abstract description 6
- 238000000034 method Methods 0.000 abstract description 5
- 238000010586 diagram Methods 0.000 abstract description 4
- 239000003795 chemical substances by application Substances 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 239000002689 soil Substances 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
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Abstract
【課題】地中送電用ＯＦケーブルの重力油槽において油漏れを簡単な方法で精度良く検出するＯＦケーブル重力油槽の漏油監視装置を提供する。【解決手段】油量Ｌ[ｍ３]の油温Ｔ[℃]との関係を関係式Ｌ=α・Ｔ＋βで表現し、１分に１回程度の割合で数日間サンプリングしたデータから偏りの少ないＮ個の標本値を選択抽出し、上記αと上記βの値を推定し、得られた関係式から現在の油温における推定油量を算出し、現在の油量と比較する。また数日毎に算出した上記βの値(０[℃]における油量)の低下が認められた場合、油量の最低レベルβoを下回るに至る日を予測する。【選択図】図２PROBLEM TO BE SOLVED: To provide an oil leakage monitoring device for an OF cable gravity oil tank, which accurately detects oil leakage in a gravity oil tank of an underground power transmission OF cable by a simple method. SOLUTION: The relationship between the oil amount L[m3] and the oil temperature T[°C] is expressed by a relational expression L=α·T+β, and there is little deviation from data sampled at a rate of about once a minute for several days. N sample values are selected and extracted, the values of α and β are estimated, the estimated oil amount at the current oil temperature is calculated from the obtained relational expression, and the estimated oil amount is compared with the current oil amount. When a decrease in the value of β (oil amount at 0 [°C]) calculated every few days is observed, the date until the oil amount falls below the minimum level βo is predicted. [Selection diagram] Figure 2
Description
本発明は、ＯＦケーブル重力油槽の漏油監視装置に関する。 The present invention relates to an oil leakage monitoring device for an OF cable gravity oil tank.
地中送電用ＯＦケーブルは次第にＣＶケーブルに置き換わりつつあるものの未だ相当数が現場で使用されており、その絶縁油および油槽の管理に多大な人力を要している。特に油漏れの点検は重要であり、油漏れは絶縁および放熱効果低下の要因となり、ガスの発生を誘発し更なる絶縁性能低下につながるので、発見次第シーリング材の交換等対策が必要となるものである。 Although OF cables for underground power transmission are gradually being replaced by CV cables, a considerable number of them are still used in the field, and management of the insulating oil and oil tank requires great human power. In particular, it is important to check for oil leaks, and oil leaks cause a reduction in insulation and heat dissipation effects, which induces the generation of gas and leads to further deterioration in insulation performance. Is.
特許文献１では液面上に浮かべたフロートが下がるとフロートに接続された紐が引かれて警報回路のスイッチが入る仕組みが描かれている。 Patent Document 1 describes a mechanism in which when the float floated on the liquid surface is lowered, a string connected to the float is pulled and the alarm circuit is switched on.
また、特許文献２には油量に複数の警報レベルを設け、そのレベルに到達した時間差から送電を停止すべき最低レベルまで到達する時間を予測する仕組みが記載されている。 Further, Patent Document 2 describes a mechanism in which a plurality of alarm levels are provided for the oil amount and the time to reach the minimum level at which power transmission should be stopped is predicted from the time difference when the levels are reached.
また、特許文献３では油量と電流、外気温度、土中温度の関係を示す近似統計関数から油量を算出できる近似関数を得て、測定された油量との差から漏油を検出する方法が記載されている。 Further, in Patent Document 3, an approximate function that can calculate the oil amount is obtained from an approximate statistical function indicating the relationship between the oil amount and the current, the outside air temperature, and the soil temperature, and the leaked oil is detected from the difference between the measured oil amount. The method is described.
しかしながら、絶縁油は温度によって膨張収縮する性質が有るので特許文献１の方法では温度が最低値となり油面が最も低下した状態よりもさらに低下した時点で漏油検出するよう設定しないと温度の低下による油の体積減少を漏油と誤判定する可能性がある。 However, since the insulating oil has the property of expanding and contracting depending on the temperature, in the method of Patent Document 1, the temperature decreases to the lowest value and the oil level must be set to detect the oil leakage when the oil level further decreases from the lowest value. There is a possibility that the decrease in the volume of oil due to will be erroneously determined as an oil leak.
また、特許文献２では油量の温度による膨張収縮について、全く検討されていない。 In addition, Patent Document 2 does not consider expansion and contraction of oil according to temperature.
また、特許文献３の方法では油量と電流、外気温度、土中温度の関係を求めるより油温を直接測定して油温と油量の関係を求めた方が効果的である。 Further, in the method of Patent Document 3, it is more effective to directly measure the oil temperature and determine the relationship between the oil temperature and the oil amount than to determine the relationship between the oil amount and the current, the outside air temperature, and the soil temperature.
こういった点に鑑みて、本願が解決すべき課題は、地中送電用ＯＦケーブルの重力油槽において油漏れを簡単な方法で精度良く検出するＯＦケーブル重力油槽の漏油監視装置を提供することにある。 In view of these points, the problem to be solved by the present application is to provide an oil leak monitoring device for an OF cable gravity oil tank that accurately detects oil leakage in the gravity oil tank of an underground power transmission OF cable by a simple method. It is in.
そこで本願の発明者は油量Ｌ[ｍ３]の油温Ｔ[℃]との関係を関係式Ｌ=α・Ｔ＋βで表現し、1分に1回程度の割合で数日間サンプリングした油量Ｌと油温Ｔの収録データから上記αと上記βおよび油量Lの標準偏差を求め、現在の油温から上記関係式によって油量を推定し、現在の油量の測定値が上記推定された油量からかなり低下していて、その差が前記標準偏差の２〜３倍を超える場合、急激な油漏れが有ったと判定することとしたのである。 Therefore, the inventor of the present application expresses the relationship between the oil amount L[m 3 ] and the oil temperature T[°C] by the relational expression L=α·T+β, and the oil amount sampled for several days at a rate of about once a minute. The standard deviations of α and β and the oil amount L are obtained from the recorded data of L and the oil temperature T, and the oil amount is estimated from the current oil temperature by the above relational expression, and the measured value of the current oil amount is estimated above. It was decided that if there was a sharp decrease in the oil amount and the difference was more than 2-3 times the standard deviation, there was a sudden oil leak.
また、上記βの値を上記数日間のデータから移動平均的かつ定期的に算出し、前記βの値が下降している場合、別途設定した油量の最低許容値を下回ることとなる日を推定し、表示することにした。 Further, the value of β is calculated from the data of the above several days on a moving average and periodically, and when the value of β is falling, the day when it falls below the minimum allowable value of the oil amount set separately Estimated and decided to display.
具体的には油量Ｌｋおよび油温Ｔｋ(ｋ=１・・・Ｎ)のＮ個のデータの組に対して関係式Ｌ=α・Ｔ＋βの誤差εｋをεｋ＝Ｌｋ−α・Ｔｋ−βとおいてΣ(εｋ 2)が最小となるαおよびβを求めた。但し、異常データによる影響を低減させるため、倍数γを定め、誤差εｋが誤差の標準偏差σ＝√｛Σ(εｋ 2)／Ｎ｝のγ倍を超える場合、そのデータを不採用とし、誤差評価に入れないようにした。 Specifically, the error ε k of the relational expression L=α·T+β is set to ε k =L k − for the N data sets of the oil amount L k and the oil temperature T k (k=1... N). With α·T k −β, α and β at which Σ(ε k 2 ) is minimized were obtained. However, in order to reduce the influence of abnormal data, a multiple γ is set, and if the error ε k exceeds the standard deviation σ = √ {Σ(ε k 2 )/N} of γ times, the data is rejected. , So that it is not included in the error evaluation.
また、油温Ｔｋが特定温度に偏在している場合、集中している部分のデータがほとんどで、その周辺部のデータが少ないままα、βの値を求めると、周辺部では誤差の多い評価結果となるので、数度℃毎に区間を設定し、区間ごとに平均値を求め、各区間から一個のデータを採用してそのデータ郡からαおよびβの値を求めた。 Further, when the oil temperature T k is unevenly distributed at a specific temperature, most of the data is in the concentrated portion, and when the values of α and β are obtained with little data in the peripheral portion, there are many errors in the peripheral portion. Since the evaluation results were obtained, intervals were set every several degrees Celsius, average values were calculated for each interval, and one data was adopted from each interval and values of α and β were calculated from the data group.
本願の第一の発明は、地中送電用ＯＦケーブルの重力油槽において、油槽上部に液面計センサーを設置し、上記液面計センサーの測定値から油槽内部の油量を得、一方温度センサーを油槽内部、給油管内部およびＯＦケーブル内部に設置して油温を測定し、油量と油温の関係式を求め、前記関係式から油漏れを検出するＯＦケーブル重力油槽の漏油監視装置であって、センサーの他に演算部、判定部、送信部、モニター部からなり、演算部では上記油量Ｌ[ｍ3]と油温Ｔ[℃]の関係式をＬ=α・Ｔ＋β（但し、α、βは定数）とし、Ｎ個のサンプルデータ（Ｌ1、Ｌ2・・・ＬN、および、Ｔ1、Ｔ2・・・ＴN）に対し、温度に関わらない油量 β（０[℃]における推定油量）を[式１]で算出し、判定部では前記[式１]での算出値が別途設定する油量の最低許容値の０[℃]における推定値 β０を下回った場合に油漏れを検出したものと判定して送信部を経由してモニター部に情報を送り警報を発報することを特徴とするＯＦケーブル重力油槽の漏油監視装置である。
[式１]
1st invention of this application WHEREIN: In the gravity oil tank of the underground cable OF cable, the liquid level sensor is installed in the oil tank upper part, the oil amount inside an oil tank is obtained from the measured value of the said liquid level sensor, On the other hand, temperature sensor Is installed inside the oil tank, inside the oil supply pipe, and inside the OF cable to measure the oil temperature, determine the relational expression between the oil amount and the oil temperature, and detect the oil leakage from the relational expression. In addition to the sensor, the calculation unit includes a calculation unit, a determination unit, a transmission unit, and a monitor unit. In the calculation unit, the relational expression between the oil amount L[m 3 ] and the oil temperature T[° C.] is L=α·T+β( However, α and β are constants, and the oil amount β irrespective of temperature with respect to N sample data (L 1 , L 2 ... L N , and T 1 , T 2 ... TN ) (Estimated oil amount at 0[°C]) is calculated by [Equation 1], and in the determination unit, the estimated value β at 0[°C] of the minimum allowable oil amount set separately by the above [Equation 1] β It is an oil leak monitoring device for an OF cable gravity oil tank, characterized in that when it is less than 0 , it is determined that an oil leak has been detected and information is sent to the monitor unit via the transmission unit to issue an alarm.
[Formula 1]
また、本願第二の発明は、上記ＯＦケーブル重力油槽の油漏れ監視装置であって、1分に1回程度の割合で数日間サンプリングした油量Ｌと油温Ｔの収録データから上記βの値を移動平均的かつ定期的に算出し、前記βの値が下降している場合、別途設定した油量の最低許容値β０より低下するに至る日を推定し、表示することを特徴とするＯＦケーブル重力油槽の漏油監視装置である。 The second invention of the present application is an oil leak monitoring device for an OF cable gravity oil tank, wherein β is obtained from the recorded data of the oil amount L and the oil temperature T sampled for several days at a rate of about once a minute. It is characterized in that the value is calculated on a moving average and periodically, and when the value of β is falling, the date until it falls below the separately set minimum allowable value β 0 of the oil amount is estimated and displayed. This is an oil leak monitoring device for an OF cable gravity oil tank.
また、本願第三の発明は、上記ＯＦケーブル重力油槽の油漏れ監視装置であって、過去のＮ個のサンプルデータ（Ｌ1、Ｌ2・・・ＬN、および、Ｔ1、Ｔ2・・・ＴN）に対し、温度に関わる係数αを[式２]で推定し、請求項１に記載のβと共に油量Ｌと温度Ｔとの関係式を成し、現在の温度に対する油量Ｌを推定し、実際の測定値が推定値よりも誤差の範囲を超えて有意に低い場合、急激な油漏れを検出したものとして警報を発報することを特徴とするＯＦケーブル重力油槽の漏油監視装置である。
[式２]
A third invention of the present application is an oil leak monitoring device for an OF cable gravity oil tank, comprising N pieces of past sample data (L 1 , L 2 ... L N , and T 1 , T 2. ··· T N ), a coefficient α related to temperature is estimated by [Equation 2], and a relational expression between the oil amount L and the temperature T is formed together with β described in claim 1, and the oil amount with respect to the current temperature is formed. Estimating L, and when the actual measured value is significantly lower than the estimated value and is significantly lower than the estimated value, an alarm is issued as if a sudden oil leak was detected, and an OF cable gravity oil tank leak is characterized. It is an oil monitoring device.
[Formula 2]
また、本願第四の発明は、上記ＯＦケーブル重力油槽の油漏れ監視装置であって、急激な油漏れを判定する請求項３に記載の誤差の範囲を別途に設定する設定値γを用い、過去のＮ個のサンプルデータ（Ｌ1、Ｌ2・・・ＬN）の標準偏差のγ倍とし、γの値を３ないし６以下とすることを特徴とするＯＦケーブル重力油槽の漏油監視装置である。 Further, a fourth invention of the present application is the oil leak monitoring device for an OF cable gravity oil tank, wherein a set value γ for separately setting an error range according to claim 3 for determining a sudden oil leak is used. Leakage oil monitoring in an OF cable gravity oil tank characterized by setting the standard deviation of past N sample data (L 1 , L 2 ... L N ) to γ times and setting the value of γ to 3 to 6 or less. It is a device.
また、本願第五の発明は、温度データが一定の区間に遍在する場合、温度をＮ個の区間に分割し、各区間毎に温度、油量の平均値を算出し、Ｎ個の各区間の平均値から［式１］および［式２］によって上記油量Ｌ[ｍ3]と油温Ｔ[℃]の関係式の係数αおよびβを定めたことを特徴とするＯＦケーブル重力油槽の漏油監視装置である。 Further, in the fifth invention of the present application, when the temperature data is ubiquitous in a certain section, the temperature is divided into N sections, the average value of the temperature and the oil amount is calculated for each section, and each of the N sections is calculated. An OF cable gravity oil tank characterized in that coefficients α and β of a relational expression between the oil amount L [m 3 ] and the oil temperature T [° C.] are determined by [Equation 1] and [Equation 2] from the average value of the section. This is an oil leakage monitoring device.
また、本願第六の発明は、本願の第一の発明における油温を油槽内の内油タンクユニット、給油管およびＯＦケーブル本体内に設置した油温センサーによる油温に対しそれぞれ内油タンクユニットの容積の標準値、給油管の容積、およびＯＦケーブル内の内油の占める部分の容積によって重み付けした加重平均値としたことである。これにより、ＯＦケーブルによる発熱でケーブル部分のみ温度上昇した場合でも内油の体積変化をより正確に算出することができる。
Further, a sixth invention of the present application is such that the oil temperature in the first invention of the present application is different from the oil temperature by the oil temperature sensor installed in the inner oil tank unit in the oil tank, the oil supply pipe and the OF cable body. Is the weighted average value weighted by the standard value of the volume, the volume of the oil supply pipe, and the volume of the portion occupied by the internal oil in the OF cable. This makes it possible to more accurately calculate the volume change of the internal oil even when the temperature of only the cable portion rises due to the heat generated by the OF cable.
本願発明により、従来は年間を通じて最も油温が低く、油面が低下している状態より更に油面が低下した場合にのみ警報発信が可能であったが、本願装置により、現状の温度に関係なく常に０[℃]における油量を推定することができるので、警報発信レベルを温度に関係しない値として設定でき、油漏れをより早期に発見できる。 According to the present invention, conventionally, the oil temperature is lowest throughout the year, and the alarm can be issued only when the oil level further lowers than the state where the oil level is lowered. Since it is possible to always estimate the oil amount at 0[° C.], the alarm transmission level can be set as a value that is not related to temperature, and oil leakage can be detected earlier.
本願装置では、急激な漏油は現在の計測値と推定量の差から判定し、徐々の漏油は過去数日間のデータから求めた推定量を求める式のパラメータの変化から判定しており、後者ではあと何日で警報レベルに達するかを算出してモニターに表示できる。
In the device of the present application, a sudden oil leak is determined from the difference between the current measured value and the estimated amount, and a gradual oil leak is determined from the change in the parameter of the equation for obtaining the estimated amount obtained from the data of the past several days, In the latter case, the number of days to reach the warning level can be calculated and displayed on the monitor.
以下に本願の実施形態を詳細に説明する。図１は本願のシステム全体を示す概念図である。 Hereinafter, embodiments of the present application will be described in detail. FIG. 1 is a conceptual diagram showing the entire system of the present application.
ＯＦケーブルの重力油槽は図１のように高所に設置されており、地中送電線（ＯＦケーブル）とは給油管で接続されている。ＯＦケーブル内を流れる油は内油と呼ばれており、給油管を経て重力油槽内部の内油タンクユニット内に密閉されている。 The gravity oil tank of the OF cable is installed at a high place as shown in FIG. 1, and is connected to the underground power transmission line (OF cable) by an oil supply pipe. The oil flowing in the OF cable is called inner oil, and is sealed in the inner oil tank unit inside the gravity oil tank through the oil supply pipe.
この内油タンクユニットは油槽内では外油と呼ばれる油に浸かっており、温度が上がると熱膨張によって内油が膨張して内油タンクユニットが膨らみ、その結果外油が押し上げられて外油の液面が上昇する。外油自体も熱膨張するが内油の方が量的に多いので膨張の結果の液面上昇は主に内油の膨張による。また、タンクや給油管、ＯＦケーブル自体も膨張するが一般に個体の熱膨張率は液体の熱膨張率に比べて一桁小さく、問題にならない。 This inner oil tank unit is immersed in oil called outer oil in the oil tank, and when the temperature rises, the inner oil expands due to thermal expansion and the inner oil tank unit swells. The liquid level rises. The outer oil itself also thermally expands, but the inner oil is larger in quantity, so the liquid level rise resulting from the expansion is mainly due to the expansion of the inner oil. Further, the tank, the oil supply pipe, and the OF cable itself also expand, but in general, the coefficient of thermal expansion of an individual is one digit smaller than the coefficient of thermal expansion of a liquid, which is not a problem.
外油液面上部には外気が除湿剤などを通して出入りしている。油槽上部には超音波液面センサーが設置されており、液面までの距離を測っているが、油槽の底面から液面センサーまでの高さから液面センサーから液面までの距離を差し引くことで液面の高さを得てそれに油槽の水平断面の断面積を掛けて油槽内の油量を測定している。 Outside air enters and leaves the upper part of the outer oil surface through a dehumidifying agent. An ultrasonic liquid level sensor is installed in the upper part of the oil tank to measure the distance to the liquid level. However, subtract the distance from the liquid level sensor to the liquid level from the height from the bottom of the oil tank to the liquid level sensor. Then, the height of the liquid surface is obtained and multiplied by the cross-sectional area of the horizontal section of the oil tank to measure the amount of oil in the oil tank.
漏油の検出においては油量の変化を検出すれば良く、総油量を得ることは不要であるので油槽の底面以上の部分にある油量の変化を検出できれば良い。 In detecting the oil leakage, it is sufficient to detect the change in the amount of oil, and it is not necessary to obtain the total amount of oil, so it is sufficient to detect the change in the amount of oil in the portion above the bottom surface of the oil tank.
しかし、油温については膨張する油の主体が給油管やＯＦケーブル内にあるので３個の油温センサーを使い内油タンク内、内油給油管内、ＯＦケーブル内それぞれの温度に各部位の油量による重み付けを行った加重平均値を用いて平均温度を求めてこれを使用する。 However, as for the oil temperature, the main oil that expands is in the oil supply pipe and the OF cable, so three oil temperature sensors are used, and the oil temperature of each part is adjusted to the temperature of the inner oil tank, the inner oil supply pipe, and the OF cable The weighted average value weighted by the quantity is used to find the average temperature and used.
一方、本願の漏油監視装置は重力油槽外部の側面に設置されており、その構成は図２に示されている通りである。 On the other hand, the oil leakage monitoring device of the present application is installed on the side surface outside the gravity oil tank, and its configuration is as shown in FIG.
本願の漏油監視装置は１個の超音波液面センサーと３個の油温センサーおよび、演算部、判定部、送信部からなる。液面センサーはその設置位置から外油の液面までの距離を測定する。液面までの距離が計測できるものであれば良く、超音波方式である必要はない。 The oil leakage monitoring device of the present application includes one ultrasonic liquid level sensor, three oil temperature sensors, a calculation unit, a determination unit, and a transmission unit. The liquid level sensor measures the distance from the installation position to the liquid level of the external oil. The ultrasonic system is not necessary as long as it can measure the distance to the liquid surface.
油温センサーは油槽内の内油タンクユニットの温度や内油の給油管およびＯＦケーブル本体内の内油の温度を計測する。 The oil temperature sensor measures the temperature of the inner oil tank unit in the oil tank and the temperature of the inner oil in the oil supply pipe of the inner oil and the OF cable body.
演算部では油槽の深さと外油の液面までの距離と油槽の径から内油のタンクユニットを含めた外油の油量および、３か所の油温センサーからそれぞれ内油タンクユニットの容積の標準値、給油管の容積、およびＯＦケーブル内の内油の部分の容積によって重みづけされた３か所の油温の加重平均値と、それら油量と油温加重平均値のＮ組のデータから[式１]のβ値および、[式２]のα値を計算する。 In the calculation unit, the depth of the oil tank, the distance to the liquid surface of the outer oil, the diameter of the oil tank, the amount of the outer oil including the tank unit for the inner oil, and the oil temperature sensors at three locations respectively determine the volume of the inner oil tank unit. Of the oil temperature at three locations weighted by the standard value of the oil supply pipe, the volume of the oil supply pipe, and the volume of the internal oil portion in the OF cable, and N sets of the oil amount and the oil temperature weighted average value The β value of [Equation 1] and the α value of [Equation 2] are calculated from the data.
判定部では演算部で算出された油量の現在値から漏油の有無を判定するとともに、上記α値や上記β値を過去の値と比較し、特に上記β値が零℃における油量を表すので、この値の変化からそれが最低油量を下回るまでの日数を算出し、油量の現在値および油量の現在値から判定した漏油の有無の情報とともに送信部に送る。 The determination unit determines the presence or absence of oil leakage from the current value of the oil amount calculated by the calculation unit, compares the α value and the β value with past values, and particularly determines the oil amount when the β value is 0°C. Therefore, the number of days from the change of this value until it falls below the minimum oil amount is calculated and sent to the transmitting unit together with the current value of the oil amount and the information on the presence or absence of oil leakage determined from the current value of the oil amount.
送信部ではそれらの情報をWiFiなどの通信手段によって装置外に送信する。
送信された情報はネットワークやサーバーを経由して管理者のパソコンに送信され、管理者のパソコン上で油量の現在値、油量低下の有無、最低油量を下回るまでの推定日数を表示する。
The transmitter transmits the information to the outside of the device by communication means such as WiFi.
The sent information is sent to the administrator's personal computer via the network or server, and the current amount of oil on the administrator's computer, the presence or absence of oil decrease, and the estimated number of days until it falls below the minimum oil amount are displayed. ..
また、上記と異なる実施形態を採って、上記演算部での演算を管理者のパソコン上で行わせても良い。 Further, by adopting an embodiment different from the above, the calculation in the calculation unit may be performed on the personal computer of the administrator.
また、上記油温の加重平均値の計算の代わりにいずれか一か所の油温で代表させても良いが、例えば油槽内の内油タンクユニットの油温で代表させた場合、ＯＦケーブル自体の発熱による油温への影響が考慮されないため誤差が生じる可能性がある。
Further, instead of calculating the above-mentioned weighted average value of the oil temperature, the oil temperature at any one of the positions may be used as a representative. For example, when the oil temperature of the inner oil tank unit in the oil tank is used as a representative, the OF cable itself An error may occur because the effect of the heat generation on the oil temperature is not considered.
１．重力油槽
２．地中送電線（ＯＦケーブル）
３．内油の給油管
４．漏油監視装置
５．通信用アンテナ
６．重力油槽内部拡大図
７．内油タンクユニット
８．超音波液面センサー
９．除湿剤
１０．外油液面
１１．油温センサー１
１２．給排気口
１３．内油給油管
１４．油温センサー２
１５．油温センサー３
1. Gravity oil tank 2. Underground power transmission line (OF cable)
3. Inner oil supply pipe 4. Oil leakage monitoring device 5. Communication antenna 6. Enlarged view of gravity oil tank interior 7. Inner oil tank unit 8. Ultrasonic liquid level sensor 9. Dehumidifying agent 10. Outer oil level 11. Oil temperature sensor 1
12. Air supply/exhaust port 13. Inner oil supply pipe 14. Oil temperature sensor 2
15. Oil temperature sensor 3
Claims (6)
The oil leakage monitoring device for an OF cable gravity oil tank according to claim 1, wherein the recorded data of the oil amount L and the oil temperature T sampled for several days at a rate of about once per minute is used to calculate [Equation 1]. Calculate the value of β in a moving average periodically, and if the value of β is falling, estimate and display the date until it falls below the minimum allowable value β 0 of the oil amount set separately. Oil leak monitoring device for OF cable gravity oil tank.
A leakage oil monitoring device OF cable gravity oil tank according to claim 1, past N samples data (L 1, L 2 ··· L N, and, T 1, T 2 · · · T N ) to the value of the coefficient α applied to the temperature estimated by the number 2 [formula 2], forms a relationship between the oil level L and the temperature T with β according to claim 1, for the current temperature An OF cable gravity oil tank, which estimates the oil amount L and, if the actual measured value is significantly lower than the estimated value and is significantly lower than the estimated value, issues an alarm as if a sudden oil leak was detected. Oil leakage monitoring device.
It is an oil leakage monitoring device of the OF cable gravity oil tank of Claims 1-3, Comprising: The setting value (gamma) which sets the range of the error of Claim 3 which determines a sudden oil leak separately is used. An oil leakage monitoring device for an OF cable gravity oil tank, wherein the standard deviation of N sample data (L 1 , L 2 ... L N ) is γ times, and the value of γ is 3 to 6 or less.
A leakage oil monitoring device OF cable gravity oil tank according to claim 1 to 4 divided, with respect to the data amount of oil L [m 3] and the oil temperature T [° C.], the oil temperature data into N intervals Then, the average value of the oil amount and the oil temperature is obtained in each section, and the N amount of average values are used to calculate the oil amount L [m 3 from the [Equation 1] of Equation 1 and the [Equation 2] of Equation 2. ] And the oil temperature T[° C.] in the relational expression , the constants α and β according to claim 1 are obtained, and an oil leakage monitoring device for an OF cable gravity oil tank.
The oil leakage monitoring device for an OF cable gravity oil tank according to any one of claims 1 to 5, wherein the oil temperature according to claim 1 is obtained by an oil temperature sensor installed in the inner oil tank unit in the oil tank, the oil supply pipe, and the OF cable body. The leakage of the OF cable gravity oil tank is characterized in that the oil temperature is a weighted average value that is weighted by the standard value of the volume of the inner oil tank unit, the volume of the oil supply pipe, and the volume of the portion occupied by the inner oil in the OF cable. Oil monitoring device.
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