JP5142783B2 - Gas pressure detector for gas insulated switchgear - Google Patents

Gas pressure detector for gas insulated switchgear Download PDF

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JP5142783B2
JP5142783B2 JP2008083887A JP2008083887A JP5142783B2 JP 5142783 B2 JP5142783 B2 JP 5142783B2 JP 2008083887 A JP2008083887 A JP 2008083887A JP 2008083887 A JP2008083887 A JP 2008083887A JP 5142783 B2 JP5142783 B2 JP 5142783B2
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gas pressure
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JP2009236719A (en
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伸樹 居蔵
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Mitsubishi Electric Corp
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
    • H02B13/00—Arrangement of switchgear in which switches are enclosed in, or structurally associated with, a casing, e.g. cubicle
    • H02B13/02—Arrangement of switchgear in which switches are enclosed in, or structurally associated with, a casing, e.g. cubicle with metal casing
    • H02B13/035—Gas-insulated switchgear
    • H02B13/065—Means for detecting or reacting to mechanical or electrical defects
    • H02B13/0655—Means for detecting or reacting to mechanical or electrical defects through monitoring changes of gas properties

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  • Measuring Fluid Pressure (AREA)
  • Gas-Insulated Switchgears (AREA)
  • Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
  • Installation Of Bus-Bars (AREA)

Description

本発明は、ガス絶縁開閉装置のガス絶縁容器内のガス圧力を検出して、ガス絶縁容器内のガス圧力の異常の有無を検出するガス圧力検出装置に関するものである。   The present invention relates to a gas pressure detecting device that detects a gas pressure in a gas insulated container of a gas insulated switchgear and detects whether there is an abnormality in the gas pressure in the gas insulated container.

絶縁ガスが封入されたガス絶縁容器内に遮断器や断路器等の機器を収納したガス絶縁開閉装置においては、絶縁性能および消弧性能を保つために、絶縁ガスのガス圧力を規定値に保つ必要がある。そのため、ガス絶縁容器から絶縁ガスが漏洩した場合など、ガス圧力に異常が発生した場合にはこれを検出する必要がある。   In a gas insulated switchgear in which equipment such as circuit breakers and disconnectors are housed in a gas insulated container filled with insulating gas, the gas pressure of the insulating gas is maintained at a specified value in order to maintain insulation performance and arc extinguishing performance. There is a need. Therefore, when an abnormality occurs in the gas pressure, such as when the insulating gas leaks from the gas insulating container, it is necessary to detect this.

例えば特許文献１に開示されたガス絶縁開閉装置のガス圧力監視装置においては、ガス絶縁開閉装置のガス絶縁容器内に充填された絶縁ガスの圧力を検出するガス圧力検出器と、ガス絶縁開閉装置の周囲温度を検出する温度検出器と、ガス圧力検出器にて検出されたガス圧力信号と温度検出器にて検出された温度信号から、検出されたガス圧力をある温度におけるガス圧力に換算する演算を行い、その演算結果である換算圧力値に基づいてガス絶縁容器内の絶縁ガスの圧力の異常を検出する演算装置と、が設けられている。   For example, in a gas pressure monitoring device for a gas insulated switchgear disclosed in Patent Document 1, a gas pressure detector for detecting the pressure of an insulating gas filled in a gas insulated container of the gas insulated switchgear, and a gas insulated switchgear The detected gas pressure is converted to the gas pressure at a certain temperature from the temperature detector that detects the ambient temperature of the gas, the gas pressure signal detected by the gas pressure detector, and the temperature signal detected by the temperature detector. An arithmetic device is provided that performs an operation and detects an abnormality in the pressure of the insulating gas in the gas insulation container based on a converted pressure value that is a result of the operation.

特開平０７-３３６８２１号公報Japanese Patent Application Laid-Open No. 07-336821

従来の技術は上記のように構成されているので、温度検出器は周囲温度を測定し、絶縁ガスの正確な温度を測定していないため、換算圧力値に誤差が生じるという問題点があった。そのため、換算圧力値に基づいてなされるガス圧力の異常の検出精度も低下するという問題点があった。   Since the conventional technology is configured as described above, the temperature detector measures the ambient temperature and does not measure the exact temperature of the insulating gas, so there is a problem that an error occurs in the converted pressure value. . For this reason, there is a problem in that the detection accuracy of the abnormality of the gas pressure made based on the converted pressure value also decreases.

本発明は、上記に鑑みてなされたものであって、高い精度でガス圧力の異常の検出を行うことが可能なガス絶縁開閉装置のガス圧力検出装置を提供することを目的とする。   The present invention has been made in view of the above, and an object of the present invention is to provide a gas pressure detection device for a gas insulated switchgear capable of detecting an abnormality in gas pressure with high accuracy.

上述した課題を解決し、目的を達成するために、本発明にかかるガス絶縁開閉装置のガス圧力検出装置は、絶縁ガスが封入されたガス絶縁容器内のガス圧力を検出し、前記ガス圧力の異常の有無を判定するガス絶縁開閉装置のガス圧力検出装置であって、前記ガス絶縁容器内のガス圧力を検出する圧力検出部と、前記ガス絶縁容器内のガス温度を検出する温度検出部と、検出された前記ガス圧力および前記ガス温度から、前記ガス圧力を所定の温度におけるガス圧力に換算する演算を行い、その演算結果として換算圧力を算出する演算部と、前記ガス温度の測定誤差に起因する前記換算圧力の誤差を補正する補正演算部と、を備え、前記演算部は、前記補正演算部による補正後の換算圧力に基づき、前記ガス圧力の異常の有無を判定することを特徴とする。   In order to solve the above-described problems and achieve the object, a gas pressure detecting device of a gas insulated switchgear according to the present invention detects a gas pressure in a gas insulated container filled with an insulating gas, and A gas pressure detection device for a gas insulated switchgear that determines the presence or absence of an abnormality, a pressure detection unit that detects a gas pressure in the gas insulation container, and a temperature detection unit that detects a gas temperature in the gas insulation container; An operation for converting the gas pressure to a gas pressure at a predetermined temperature from the detected gas pressure and the gas temperature, and calculating a converted pressure as the calculation result, and a measurement error of the gas temperature A correction calculation unit that corrects an error in the converted pressure caused by the correction, and the calculation unit determines whether there is an abnormality in the gas pressure based on the converted pressure corrected by the correction calculation unit. And features.

本発明によれば、ガス温度の測定誤差に起因する誤差の補正がされた補正後の換算圧力に基づいてガス圧力の異常の有無を判定するようにしたので、より精度の高い換算圧力を得るとともに、高い精度でガス圧力の異常の検出を行うことが可能になるという効果がある。   According to the present invention, the presence / absence of abnormality in the gas pressure is determined based on the corrected pressure after correction of the error caused by the measurement error of the gas temperature, so that a more accurate converted pressure is obtained. In addition, there is an effect that it is possible to detect an abnormality in the gas pressure with high accuracy.

以下に、本発明にかかるガス絶縁開閉装置のガス圧力検出装置の実施の形態を図面に基づいて詳細に説明する。なお、この実施の形態によりこの発明が限定されるものではない。   Embodiments of a gas pressure detection device for a gas insulated switchgear according to the present invention will be described below in detail with reference to the drawings. Note that the present invention is not limited to the embodiments.

実施の形態１．
図１は、本実施の形態にかかるガス絶縁開閉装置のガス圧力検出装置の構成を示す図である。図１においては、ガス絶縁容器１、絶縁ガス２、中心導体１７、および絶縁スペーサ１８が示されており、これらはガス絶縁開閉装置を構成するものである。 Embodiment 1 FIG.
FIG. 1 is a diagram illustrating a configuration of a gas pressure detection device of a gas insulated switchgear according to the present embodiment. FIG. 1 shows a gas insulating container 1, an insulating gas 2, a central conductor 17, and an insulating spacer 18, which constitute a gas insulated switchgear.

ガス絶縁容器１の内部には絶縁ガス２が充填されるとともに、その内部には長手方向に沿って延在する中心導体１７が設けられている。ガス絶縁容器１内の絶縁ガス２は規定の圧力で封入されたものであり、ガス漏れ等がない限りは、ある温度で一定のガス圧力を示す。また、中心導体１７は、ガス絶縁容器１を複数のガス区画に区分する絶縁スペーサ１８によって支持されている。   The gas insulating container 1 is filled with an insulating gas 2 and a central conductor 17 extending along the longitudinal direction is provided therein. The insulating gas 2 in the gas insulating container 1 is sealed at a specified pressure, and exhibits a constant gas pressure at a certain temperature as long as there is no gas leakage. The central conductor 17 is supported by an insulating spacer 18 that divides the gas insulating container 1 into a plurality of gas compartments.

図１では、ガス圧力検出装置の構成要素として、ガス圧力検出器３ａ、３ｂ、３ｃ、温度検出器４、演算装置５、および補正演算器６が示されている。   In FIG. 1, gas pressure detectors 3 a, 3 b, 3 c, a temperature detector 4, a calculation device 5, and a correction calculator 6 are shown as components of the gas pressure detection device.

ガス絶縁容器１には、例えば３つのガス区画が示されており、これらのガス区画にそれぞれ設置されたガス圧力検出器３ａ、３ｂ、３ｃは、各ガス区画の絶縁ガスの圧力を検出する。また、ガス絶縁容器１の外部に設けられた温度検出器４は、ガス絶縁容器１の周囲温度を検出する。したがって、温度検出器４は、ガス絶縁容器１内の絶縁ガス２の温度を直接測定しているわけではなく、ガス絶縁開閉装置の周囲温度を測定することで、ガス温度を検出している。   For example, three gas compartments are shown in the gas insulation container 1, and gas pressure detectors 3a, 3b, and 3c installed in these gas compartments detect the pressure of the insulating gas in each gas compartment. A temperature detector 4 provided outside the gas insulating container 1 detects the ambient temperature of the gas insulating container 1. Therefore, the temperature detector 4 does not directly measure the temperature of the insulating gas 2 in the gas insulating container 1, but detects the gas temperature by measuring the ambient temperature of the gas insulated switchgear.

ガス圧力検出器３ａ、３ｂ、３ｃと温度検出器４は、それぞれ演算装置５に接続されている。演算装置５は、ガス圧力検出器３ａ、３ｂ、３ｃにより検出されたガス圧力信号と温度検出器４により検出された温度信号から、ガス圧力検出器３ａ、３ｂ、３ｃにより検出された各々のガス圧力を所定の温度（任意の温度に設定可能であり、以下に示す例では、例えば摂氏２０度とした。）におけるガス圧力に換算する演算を行い、その演算結果をそれぞれ換算圧力値として算出する。また、演算装置５は、ガス絶縁容器１内のガス圧力異常を検出するための換算圧力の傾向を示す近似直線を算出する。演算装置５は、換算圧力値（正確には、後述の補正された換算圧力値）に基づき、ガス絶縁容器１内のガス圧力の異常の有無を判定する。   The gas pressure detectors 3a, 3b, 3c and the temperature detector 4 are each connected to the arithmetic unit 5. The arithmetic unit 5 uses the gas pressure signals detected by the gas pressure detectors 3a, 3b, and 3c and the temperature signal detected by the temperature detector 4 to detect each gas detected by the gas pressure detectors 3a, 3b, and 3c. The pressure is converted to a gas pressure at a predetermined temperature (which can be set to an arbitrary temperature, and in the example shown below, for example, 20 degrees Celsius), and the calculation result is calculated as a converted pressure value. . Further, the arithmetic device 5 calculates an approximate straight line indicating a tendency of the converted pressure for detecting an abnormal gas pressure in the gas insulating container 1. The arithmetic unit 5 determines whether there is an abnormality in the gas pressure in the gas insulation container 1 based on the converted pressure value (more precisely, a corrected converted pressure value described later).

演算装置５には補正演算器６が接続されており、この補正演算器６は演算装置５にて算出されたガス圧力検出器３ａ、３ｂ、３ｃの各々に対応する換算圧力値（それぞれ、換算圧力値９ａ、９ｂ、９ｃとする。）から誤差の補正関数を得て、得られた誤差の補正関数に基づいてこれらの換算圧力値を補正する。ここで、換算圧力値の誤差とは、主に、温度検出器４が絶縁ガス２のガス温度を直接測定しておらず、周囲温度を測定することでガス温度としていることに起因する誤差である。   A correction arithmetic unit 6 is connected to the arithmetic unit 5, and the correction arithmetic unit 6 converts converted pressure values (respectively converted) corresponding to the gas pressure detectors 3 a, 3 b, 3 c calculated by the arithmetic unit 5. The error correction function is obtained from the pressure values 9a, 9b, and 9c), and these converted pressure values are corrected based on the obtained error correction function. Here, the error of the converted pressure value is mainly an error caused by the temperature detector 4 not directly measuring the gas temperature of the insulating gas 2 but measuring the ambient temperature to obtain the gas temperature. is there.

次に、本実施の形態の動作について述べる。ガス絶縁容器１の内部に充填される絶縁ガス２の圧力は、各ガス区画の圧力を検出するガス圧力検出器３ａ、３ｂ、３ｃによってそれぞれ検出され、周囲温度は温度検出器４により検出される。   Next, the operation of this embodiment will be described. The pressure of the insulating gas 2 filled in the gas insulating container 1 is detected by gas pressure detectors 3a, 3b, and 3c that detect the pressure of each gas section, and the ambient temperature is detected by the temperature detector 4. .

演算装置５では、ガス圧力検出器３ａ、３ｂ、３ｃによりそれぞれ検出されたガス圧力および温度検出器４により検出された周囲温度から、ガス圧力検出器３ａ、３ｂ、３ｃにより検出されたガス圧力を所定の温度（例えば、摂氏２０度）におけるガス圧力に換算する演算を行い、ガス圧力検出器３ａ、３ｂ、３ｃのそれぞれに対応する換算圧力値９ａ、９ｂ、９ｃを算出する。また、演算装置５は、換算圧力値９ａ、９ｂ、９ｃのそれぞれに対して、各換算圧力値の傾向を示す近似直線１０ａ、１０ｂ、１０ｃを算出する。以下、換算圧力値９ａ、９ｂ、９ｃ、および近似直線１０ａ、１０ｂ、１０ｃの具体例について説明する。   In the arithmetic unit 5, the gas pressure detected by the gas pressure detectors 3 a, 3 b, 3 c is calculated from the gas pressure detected by the gas pressure detectors 3 a, 3 b, 3 c and the ambient temperature detected by the temperature detector 4. An operation for converting to a gas pressure at a predetermined temperature (for example, 20 degrees Celsius) is performed, and converted pressure values 9a, 9b, and 9c corresponding to the gas pressure detectors 3a, 3b, and 3c are calculated. Moreover, the arithmetic unit 5 calculates approximate straight lines 10a, 10b, and 10c indicating the tendency of each converted pressure value for each of the converted pressure values 9a, 9b, and 9c. Hereinafter, specific examples of the converted pressure values 9a, 9b, and 9c and the approximate straight lines 10a, 10b, and 10c will be described.

図２は、本実施の形態のガス圧力値および周囲温度の例を示す図、図３は、本実施の形態の換算圧力値およびこの換算圧力値の近似直線の例を示す図、図４は、本実施の形態の換算圧力値の誤差および補正関数の例を示す図、図５は、本実施の形態における補正後換算圧力値および補正後近似直線の例を示す図である。   FIG. 2 is a diagram showing an example of the gas pressure value and ambient temperature of the present embodiment, FIG. 3 is a diagram showing an example of the converted pressure value of the present embodiment and an approximate straight line of the converted pressure value, and FIG. FIG. 5 is a diagram illustrating an example of the converted pressure value error and the correction function according to the present embodiment, and FIG. 5 is a diagram illustrating an example of the corrected converted pressure value and the corrected approximate straight line according to the present embodiment.

図２では、例えばガス絶縁容器１におけるガス圧力検出器３ａで検出した絶縁ガス２のガス圧力値７、および温度検出器４で検出した周囲温度８を示している。ここで、横軸は時間を表し、具体的には、１月から１２月までの１年間における日毎にデータを表示している。また、縦軸は、温度（℃）またはガス圧力（ＭＰａ）を表している。   FIG. 2 shows, for example, the gas pressure value 7 of the insulating gas 2 detected by the gas pressure detector 3 a in the gas insulating container 1 and the ambient temperature 8 detected by the temperature detector 4. Here, the horizontal axis represents time. Specifically, data is displayed for each day in one year from January to December. The vertical axis represents temperature (° C.) or gas pressure (MPa).

図３では、演算装置５で算出した換算圧力値９ａ（例えば摂氏２０度の温度に補正した換算圧力値）およびこの換算圧力値９ａを直線近似した近似直線１０ａの例を示す。ここで、横軸は図２と同様の時間軸であり、また、縦軸は、ガス圧力（ＭＰａ）を表している。   FIG. 3 shows an example of a converted pressure value 9a calculated by the arithmetic unit 5 (for example, a converted pressure value corrected to a temperature of 20 degrees Celsius) and an approximate straight line 10a obtained by linearly approximating the converted pressure value 9a. Here, the horizontal axis is the same time axis as in FIG. 2, and the vertical axis represents the gas pressure (MPa).

図２に示すように、１年間の四季を通じて、周囲温度８が変化するためガス圧力値７もそれに合わせて変動する。しかし、ガス圧力絶縁容器１内に封入されている絶縁ガス２の容量は変化しないため、理想的には換算圧力値９ａは変動せず一定（図示例の場合、０．６４ＭＰａ）となるはずであるが、実際には図１に示すように周囲温度８が正確に絶縁ガス２の温度を検出していないため、図３に示すように、換算圧力値９ａは、ガス温度の測定誤差（この場合は、真のガス温度と周囲温度との差）に起因する誤差により１年を通じて三次関数的曲線を描くことがわかった。   As shown in FIG. 2, since the ambient temperature 8 changes throughout the four seasons of the year, the gas pressure value 7 also changes accordingly. However, since the capacity of the insulating gas 2 sealed in the gas pressure insulating container 1 does not change, the converted pressure value 9a should ideally be constant without change (0.64 MPa in the illustrated example). Actually, however, the ambient temperature 8 does not accurately detect the temperature of the insulating gas 2 as shown in FIG. 1, so that the converted pressure value 9a has a gas temperature measurement error (this error) as shown in FIG. In some cases, it was found that a cubic function curve was drawn throughout the year due to errors due to the difference between the true gas temperature and the ambient temperature.

図３では、この換算圧力値９ａを直線で近似する近似直線１０ａが示されており、図示例では、傾きを持った上昇傾向を示している。近似直線１０ａは、ガス絶縁容器１内のガス圧力異常を検出するための換算圧力値９ａの傾向を示すものであり、例えばガス漏れ等によりガス圧力が低下すると下降傾向を示す。なお、図２、図３では、ガス圧力検出器３ａで検出したガス圧力に対応する換算圧力値９ａ、および近似直線１０ａについて説明したが、図示していない換算圧力値９ｂ、９ｃ、および近似直線１０ｂ、１０ｃについても同様である。   In FIG. 3, an approximate straight line 10a that approximates the converted pressure value 9a with a straight line is shown. In the illustrated example, an upward tendency with an inclination is shown. The approximate straight line 10a shows the tendency of the converted pressure value 9a for detecting the gas pressure abnormality in the gas insulating container 1, and shows a downward tendency when the gas pressure is lowered due to, for example, gas leakage. 2 and 3, the converted pressure value 9a and the approximate line 10a corresponding to the gas pressure detected by the gas pressure detector 3a have been described. However, the converted pressure values 9b and 9c and the approximate line that are not shown are illustrated. The same applies to 10b and 10c.

次に、補正演算器６は、図４に示すように、換算圧力値９ａ、９ｂ、９ｃからその誤差１１の特徴を抽出し、この誤差１１を近似する補正関数１２を算出し、さらに、換算圧力値９ａ、９ｂ、９ｃを補正関数１２に基づいて補正し、図５に示す補正後換算圧力値１３および補正後近似直線１４を得る。図５では、換算圧力値９ａから補正関数１２分を減算することで換算圧力値９ａを補正し、補正後換算圧力値１３と、この補正後換算圧力値１３を近似する近似直線１４とを得た例を示している。   Next, as shown in FIG. 4, the correction calculator 6 extracts the characteristics of the error 11 from the converted pressure values 9a, 9b, and 9c, calculates a correction function 12 that approximates the error 11, and further calculates the conversion function. The pressure values 9a, 9b, and 9c are corrected based on the correction function 12, and the corrected converted pressure value 13 and the corrected approximate straight line 14 shown in FIG. 5 are obtained. In FIG. 5, the converted pressure value 9a is corrected by subtracting the correction function 12 minutes from the converted pressure value 9a, and the corrected converted pressure value 13 and the approximate straight line 14 that approximates the corrected converted pressure value 13 are obtained. An example is shown.

ここで、補正演算器６は、誤差１１を算出するために、まず、各日毎に換算圧力値９ａ、９ｂ、９ｃの平均値を算出する。さらに、換算圧力値９ａから各日毎に平均化された換算圧力値を差し引くことで、図４に示す誤差１１を得る。なお、図４では、横軸は図２と同様の時間軸であり、縦軸は、誤差１１を表しており、また、直線１５は誤差＝０を表す直線である。前述のように、この誤差１１は例えば三次関数曲線で近似することができる。   Here, in order to calculate the error 11, the correction calculator 6 first calculates an average value of the converted pressure values 9a, 9b, 9c every day. Further, an error 11 shown in FIG. 4 is obtained by subtracting the converted pressure value averaged every day from the converted pressure value 9a. In FIG. 4, the horizontal axis is the same time axis as in FIG. 2, the vertical axis represents the error 11, and the straight line 15 is a straight line representing the error = 0. As described above, the error 11 can be approximated by a cubic function curve, for example.

このように、換算圧力値９ａ、９ｂ、９ｃの誤差の補正は、所定の期間（図示例では、１年間）における換算圧力値９ａ、９ｂ、９ｃのデータを利用して行なわれる。つまり、演算装置５はこの期間における換算圧力値９ａ、９ｂ、９ｃのデータまたは換算圧力値９ａ、９ｂ、９ｃの算出に必要なデータを保持しており、補正演算器６はこれらのデータに基づいて補正関数１２を算出する。   As described above, the correction of the error of the converted pressure values 9a, 9b, and 9c is performed using the data of the converted pressure values 9a, 9b, and 9c in a predetermined period (one year in the illustrated example). That is, the arithmetic unit 5 holds the data of the converted pressure values 9a, 9b, 9c or the data necessary for calculating the converted pressure values 9a, 9b, 9c during this period, and the correction arithmetic unit 6 is based on these data. Thus, the correction function 12 is calculated.

以上より、図３に示す換算圧力値９ａおよび近似直線１０ａと比較し、図５では明らかに一定の圧力値（０．６４ＭＰａ）に近い補正後換算圧力値１３および補正後近似直線１４を得ることが出来ており、実際の換算圧力値に近い精度の高い結果を得ることができる。なお、図１５では、ガス圧力検出器３ａの検出するガス区画にガス漏れ等が発生しておらず、したがって補正後近似直線１４がほぼ一定の圧力値（０．６４ＭＰａ）となる場合について示したが、ガス漏れ等が発生し、補正後の圧力値が０．６４ＭＰａから許容範囲を超えて変化した場合についても同様にして補正後換算圧力値および補正後近似直線を得ることができる。   As described above, compared with the converted pressure value 9a and the approximate straight line 10a shown in FIG. 3, in FIG. 5, the corrected converted pressure value 13 and the corrected approximate straight line 14 that are clearly close to a constant pressure value (0.64 MPa) are obtained. Thus, a highly accurate result close to the actual converted pressure value can be obtained. FIG. 15 shows a case in which no gas leakage or the like occurs in the gas section detected by the gas pressure detector 3a, and therefore the corrected approximate straight line 14 has a substantially constant pressure value (0.64 MPa). However, when a gas leak or the like occurs and the corrected pressure value changes from 0.64 MPa beyond the allowable range, the corrected converted pressure value and the corrected approximate straight line can be obtained in the same manner.

また、図４、図５では、換算圧力値９ａについて補正後換算圧力値１３および補正後近似直線１４を求める例について説明したが、換算圧力値９ｂ、９ｃについてそれぞれ対応する補正後換算圧力値および補正後近似直線を求める処理についても同様である。以上のように、換算圧力値９ａ、９ｂ、９ｃにそれぞれ対応する補正後換算圧力値に基づいて、各区画毎にガス圧力の異常の有無を判定することができる。   4 and 5, the example of obtaining the corrected converted pressure value 13 and the corrected approximate straight line 14 for the converted pressure value 9a has been described, but the corrected converted pressure value corresponding to the converted pressure values 9b and 9c and The same applies to the process of obtaining the corrected approximate straight line. As described above, based on the corrected converted pressure values corresponding to the converted pressure values 9a, 9b, and 9c, it is possible to determine whether there is an abnormality in the gas pressure for each section.

本実施の形態によれば、換算圧力値９ａ、９ｂ、９ｃから誤差１１を近似する補正関数１２を算出し、この補正関数１２に基づいて換算圧力値９ａ、９ｂ、９ｃを補正するようにしたので、実際の換算圧力値に近い、より精度の高い結果換算圧力値を得ることができるとともに、高い精度でガス圧力の異常の有無を検出することが可能となる。   According to the present embodiment, the correction function 12 that approximates the error 11 is calculated from the converted pressure values 9a, 9b, and 9c, and the converted pressure values 9a, 9b, and 9c are corrected based on the correction function 12. Therefore, it is possible to obtain a more accurate result converted pressure value close to the actual converted pressure value, and to detect the presence or absence of an abnormality in the gas pressure with high accuracy.

なお、本実施の形態では、温度検出器４は周囲温度を測定しているが、実際の絶縁ガス２のガス温度を測定している場合でも誤差がある場合は、同様にして上記の補正をすることにより精度の高い検出結果を得ることができる。   In the present embodiment, the temperature detector 4 measures the ambient temperature. However, if there is an error even when the gas temperature of the actual insulating gas 2 is measured, the above correction is performed in the same manner. By doing so, a highly accurate detection result can be obtained.

また、本実施の形態では、一例としてガス圧力検出器の個数が３個の場合（ガス圧力検出器３ａ、３ｂ、３ｃ）を示したが、これに限定されず、上記の補正をすることにより、任意個のガス検出器の場合により精度の高い検出結果を得ることができる。   In the present embodiment, the case where the number of gas pressure detectors is three (gas pressure detectors 3a, 3b, 3c) is shown as an example. However, the present invention is not limited to this, and the above correction is performed. In the case of any number of gas detectors, a more accurate detection result can be obtained.

実施の形態２．
本実施の形態の構成は、実施の形態１と同様である。本実施の形態では、補正関数として、三次関数以外の関数を用いる点が実施の形態１と異なる。 Embodiment 2. FIG.
The configuration of the present embodiment is the same as that of the first embodiment. The present embodiment is different from the first embodiment in that a function other than a cubic function is used as the correction function.

次に、本実施の形態の動作について述べる。ガス絶縁容器１の内部に充填される絶縁ガス２の圧力を圧力検出器３ａ、３ｂ、３ｃにより検出し、絶縁ガス２の温度を温度検出器４により検出するところから、演算装置５で算出した換算圧力値９ａ、９ｂ、９ｃ（例えば、摂氏２０度の温度に補正した換算圧力値）および近似直線１０ａ、１０ｂ、１０ｃを得るところまでは、実施の形態１と同様である。   Next, the operation of this embodiment will be described. The pressure of the insulating gas 2 filled in the gas insulating container 1 is detected by the pressure detectors 3a, 3b, 3c, and the temperature of the insulating gas 2 is detected by the temperature detector 4, and is calculated by the arithmetic unit 5. The steps up to obtaining converted pressure values 9a, 9b, 9c (for example, converted pressure values corrected to a temperature of 20 degrees Celsius) and approximate straight lines 10a, 10b, 10c are the same as in the first embodiment.

次に、補正演算器６では、換算圧力値９ａ、９ｂ、９ｃから誤差１１の特徴を例えば三角関数の近似式として抽出し、誤差を示す補正関数１２を三角関数近似により算出し、さらに換算圧力値９を、補正関数１２分を減算することで補正し、補正後換算圧力値１３および補正後近似直線１４を得る。   Next, the correction calculator 6 extracts the characteristics of the error 11 from the converted pressure values 9a, 9b, and 9c as, for example, an approximate expression of a trigonometric function, calculates a correction function 12 indicating the error by trigonometric function approximation, and further converts the converted pressure. The value 9 is corrected by subtracting the correction function 12 minutes to obtain a corrected converted pressure value 13 and a corrected approximate straight line 14.

以上より、図３に示す換算圧力値９ａおよび近似直線１０ａと比較し、明らかに一定の圧力値（０．６４ＭＰａ）に近い補正後換算圧力値１３および補正後近似直線１４を得ることができ、実際の換算圧力値に近い精度の高い結果を得ることができる。   From the above, compared with the converted pressure value 9a and the approximate straight line 10a shown in FIG. 3, a corrected converted pressure value 13 and a corrected approximate straight line 14 that are clearly close to a constant pressure value (0.64 MPa) can be obtained. A highly accurate result close to the actual converted pressure value can be obtained.

なお、補正関数１２としては、三次関数や三角関数の他にも例えばフーリエ級数展開により得られる関数（誤差１１をフーリエ級数展開により近似した場合の関数。）など、他の近似方法による関数を使用しても、精度のよい計算結果を得ることができる。   As the correction function 12, in addition to the cubic function and the trigonometric function, for example, a function obtained by Fourier series expansion (a function obtained by approximating the error 11 by Fourier series expansion) is used. Even with this, accurate calculation results can be obtained.

本実施の形態のその他の構成、動作、および効果は実施の形態１と同様である。   Other configurations, operations, and effects of the present embodiment are the same as those of the first embodiment.

実施の形態１にかかるガス絶縁開閉装置のガス圧力検出装置の構成を示す図である。It is a figure which shows the structure of the gas pressure detection apparatus of the gas insulated switchgear concerning Embodiment 1. FIG. 実施の形態１のガス圧力値および周囲温度の例を示す図である。It is a figure which shows the example of the gas pressure value and ambient temperature of Embodiment 1. FIG. 実施の形態１の換算圧力値およびこの換算圧力値の近似直線の例を示す図である。It is a figure which shows the example of the conversion pressure value of Embodiment 1, and the approximate line of this conversion pressure value. 実施の形態１の換算圧力値の誤差および補正関数の例を示す図である。6 is a diagram illustrating an example of an error in a converted pressure value and a correction function according to the first embodiment. FIG. 実施の形態１における補正後換算圧力値および補正後近似直線の例を示す図である。6 is a diagram illustrating an example of a corrected converted pressure value and a corrected approximate straight line according to Embodiment 1. FIG.

符号の説明Explanation of symbols

１ ガス絶縁容器
２ 絶縁ガス
３ａ，３ｂ，３ｃ ガス圧力検出器
４ 温度検出器
５ 演算装置
６ 補正演算器
７ ガス圧力値
８ 周囲温度
９ａ，９ａ，９ｂ 換算圧力値
１０ａ，１０ａ，１０ｂ 近似直線
１１ 誤差
１２ 補正関数
１３ 補正後換算圧力値
１４ 補正後近似直線 DESCRIPTION OF SYMBOLS 1 Gas insulation container 2 Insulating gas 3a, 3b, 3c Gas pressure detector 4 Temperature detector 5 Arithmetic device 6 Correction | amendment computing device 7 Gas pressure value 8 Ambient temperature 9a, 9a, 9b Equivalent pressure value 10a, 10a, 10b Approximate straight line 11 Error 12 Correction function 13 Corrected pressure value after correction 14 Approximate straight line after correction

Claims (5)

絶縁ガスが封入されたガス絶縁容器内のガス圧力を検出し、前記ガス圧力の異常の有無を判定するガス絶縁開閉装置のガス圧力検出装置であって、
前記ガス絶縁容器内のガス圧力を検出する圧力検出部と、
前記ガス絶縁容器の周囲温度を前記ガス絶縁容器内のガス温度として検出する温度検出部と、
検出された前記ガス圧力および前記ガス温度から、前記ガス圧力を所定の温度におけるガス圧力に換算する演算を行い、その演算結果として換算圧力を算出する演算部と、
前記ガス温度の測定誤差に起因する前記換算圧力の誤差を補正する補正演算部と、
を備え、
前記補正演算部は、所定の期間における前記換算圧力から前記換算圧力の誤差を曲線で近似する補正関数を算出し、この補正関数を前記換算圧力から減算することで前記所定の期間における前記換算圧力の誤差の補正を行い、
前記演算部は、前記補正演算部による補正後の換算圧力に基づき、前記ガス圧力の異常の有無を判定することを特徴とするガス絶縁開閉装置のガス圧力検出装置。 A gas pressure detection device for a gas insulated switchgear that detects a gas pressure in a gas insulation container filled with an insulating gas and determines whether or not the gas pressure is abnormal,
A pressure detector for detecting a gas pressure in the gas insulation container;
A temperature detector that detects the ambient temperature of the gas insulating container as the gas temperature in the gas insulating container;
From the detected gas pressure and the gas temperature, a calculation unit that converts the gas pressure into a gas pressure at a predetermined temperature, and calculates a converted pressure as a calculation result;
A correction calculation unit for correcting an error in the converted pressure caused by the measurement error in the gas temperature;
With
The correction calculation unit calculates a correction function that approximates an error of the converted pressure with a curve from the converted pressure in a predetermined period, and subtracts the correction function from the converted pressure to thereby calculate the converted pressure in the predetermined period. Correction of the error,
The gas pressure detection device for a gas insulated switchgear, wherein the calculation unit determines whether or not the gas pressure is abnormal based on the converted pressure corrected by the correction calculation unit. 前記補正演算部は、前記補正後の換算圧力の前記所定の期間における傾向を直線で近似する近似直線を算出し、
前記演算部は、前記近似直線に基づき、前記ガス圧力の異常の有無を判定することを特徴とする請求項１に記載のガス絶縁開閉装置のガス圧力検出装置。 The correction calculation unit calculates an approximate straight line that approximates a trend in the predetermined period of the converted pressure after the correction with a straight line,
The gas pressure detection device for a gas insulated switchgear according to claim 1 , wherein the calculation unit determines whether there is an abnormality in the gas pressure based on the approximate line . 前記補正関数として、三次関数を用いたことを特徴とする請求項２に記載のガス絶縁開閉装置のガス圧力検出装置。 The gas pressure detection device for a gas insulated switchgear according to claim 2 , wherein a cubic function is used as the correction function. 前記補正関数として、三角関数を用いたことを特徴とする請求項２に記載のガス絶縁開閉装置のガス圧力検出装置。 The gas pressure detection device for a gas insulated switchgear according to claim 2 , wherein a trigonometric function is used as the correction function. 前記補正関数として、フーリエ級数展開により得られる関数を用いたことを特徴とする請求項２に記載のガス絶縁開閉装置のガス圧力検出装置。 The gas pressure detection device for a gas insulated switchgear according to claim 2 , wherein a function obtained by Fourier series expansion is used as the correction function.
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