JPH0443944Y2 - - Google Patents
Info
- Publication number
- JPH0443944Y2 JPH0443944Y2 JP14706383U JP14706383U JPH0443944Y2 JP H0443944 Y2 JPH0443944 Y2 JP H0443944Y2 JP 14706383 U JP14706383 U JP 14706383U JP 14706383 U JP14706383 U JP 14706383U JP H0443944 Y2 JPH0443944 Y2 JP H0443944Y2
- Authority
- JP
- Japan
- Prior art keywords
- gas
- pressure
- temperature
- compensated
- gas pressure
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 238000001514 detection method Methods 0.000 description 12
- 238000010586 diagram Methods 0.000 description 5
- 239000004065 semiconductor Substances 0.000 description 3
- 238000012544 monitoring process Methods 0.000 description 2
- 230000001419 dependent effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
Landscapes
- Measuring Fluid Pressure (AREA)
- Gas-Insulated Switchgears (AREA)
- Switches Operated By Changes In Physical Conditions (AREA)
Description
【考案の詳細な説明】
〔考案の技術分野〕
本考案はガス絶縁変電機器に使用される温度補
償圧力スイツチの構成に関するものである。[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to the structure of a temperature compensated pressure switch used in gas-insulated electrical substation equipment.
従来より変電所に使用されているガス絶縁変電
機器において、該機器のコンパクト化、高信頼
性、及びメンテナンスフリー等の特徴をささえる
ための重要な要因の一つとして、その機器のガス
密度が問題となる。
In gas-insulated substation equipment traditionally used in substations, the gas density of the equipment is an important factor in supporting features such as compactness, high reliability, and maintenance-free properties. becomes.
ガス絶縁機器は、絶縁媒体として優れた特性を
持つSF6ガスを使用して機器のコパクト化・高機
能化を図つている。このSF6ガスの絶縁耐力は圧
力値が依存する。 Gas insulated equipment uses SF 6 gas, which has excellent properties as an insulating medium, to make equipment more compact and highly functional. The dielectric strength of this SF 6 gas depends on the pressure value.
また、ガズ絶縁機器は密閉容器で構成されてお
り、ガス漏れが起こらない限り、ガス容積が一定
である。従つて、周囲温度が変化するとそれに従
い圧力値も変動するため、ガス圧力値でガス漏れ
は検出できない。このガス漏れを検出しようとす
れば、ガス容積が一定であることを利用してガス
密度を検出することが必要となる。 Additionally, gas insulated equipment is constructed of a sealed container, and the gas volume remains constant unless gas leaks. Therefore, when the ambient temperature changes, the pressure value also changes accordingly, so gas leakage cannot be detected by the gas pressure value. In order to detect this gas leak, it is necessary to detect the gas density by utilizing the fact that the gas volume is constant.
しかして、従来は、ガズ密度を直接検出するの
ではなく、圧力スイツチを使用してガス圧力を検
出し、これの温度補償を行なうことによつて間接
的にガス密度を測定していた。 Conventionally, instead of directly detecting the gas density, the gas pressure was detected using a pressure switch and the gas pressure was compensated for the temperature, thereby indirectly measuring the gas density.
第１図は、従来のこの種温度補償圧力スイツチ
の概略構成図を示し、この温度補償圧力スイツチ
は、２つのベローズ１，２、即ちガス絶縁機器の
ガスを封入するベローズ１と基準ガスを封入する
ベローズ２との圧力差とスプリング３の抗力の釣
合状態で移動してマイクロスイツチ５をオン・オ
フにすることによつてガス圧力を検出するもの
で、これに温度検出器により温度補正を行なつて
ガス密度を測定している。なお、４はベローズ２
に基準ガスを封入するための基準ガス圧容器であ
る。 FIG. 1 shows a schematic configuration diagram of a conventional temperature-compensated pressure switch of this type. The gas pressure is detected by turning on and off the micro switch 5 by moving in a state where the pressure difference with the bellows 2 and the drag force of the spring 3 are balanced. gas density is measured. In addition, 4 is bellows 2
This is a reference gas pressure vessel for sealing a reference gas into the air.
しかるに、このような方式においては、第２図
のガス等密度曲線に示すように、基準となるガス
圧とガス絶縁機器のタンク内ガス圧との差が常時
一定すなわち、圧力スイツチの検出特性−基準ガ
ス圧特性＝△Ｐ（一定）となるスイツチング特性
を有するものであるが、このスイツチング特性が
ガス絶縁機器のガス圧特性とが一致しない。 However, in such a system, as shown in the gas isodensity curve in Figure 2, the difference between the reference gas pressure and the gas pressure in the tank of the gas insulated equipment is always constant, that is, the detection characteristics of the pressure switch - Although it has a switching characteristic such that the reference gas pressure characteristic=ΔP (constant), this switching characteristic does not match the gas pressure characteristic of gas insulated equipment.
即ち、上記スイツチング特性は、基準となる基
準ガス圧に対するスプリング３の抗力によるもの
で温度にほとんど影響されることなく△Ｐとなり
一定となる関係にあるが、ガス絶縁機器のガス圧
特性は温度に依存して第２図中に３点鎖線で示す
ように基準ガス圧（実線）との差が低い温度程小
さく、他方高い温度程大きくなる関係にあり、上
述の各関係よりスイツチング特性がガス絶縁機器
のガス圧特性に一致しないこととなる。 In other words, the above switching characteristics are due to the drag force of the spring 3 against the reference gas pressure, which is the standard, and are almost unaffected by temperature, resulting in a constant relationship of △P. However, the gas pressure characteristics of gas insulated equipment are dependent on temperature. As shown by the three-dot chain line in Figure 2, the difference from the reference gas pressure (solid line) is smaller at lower temperatures, and larger at higher temperatures. This will not match the gas pressure characteristics of the equipment.
さらに、上記第２図における基準ガス圧、圧力
スイツチ検出特性、ガス絶縁機器のガス圧特性の
各相互間の関係を詳述する。上記圧力スイツチ検
出特性は、基準ガス圧に対してスプリング３の抗
力により一定の圧力差△Ｐの関係で、温度変化に
依存することなく基準ガス圧に追従する検出特性
を有する。 Furthermore, the relationship among the reference gas pressure, pressure switch detection characteristics, and gas pressure characteristics of the gas insulated equipment in FIG. 2 will be explained in detail. The pressure switch detection characteristic has a detection characteristic that follows the reference gas pressure without depending on temperature changes, with a constant pressure difference ΔP due to the resistance of the spring 3 with respect to the reference gas pressure.
また、上記ガス絶縁機器のガス圧特性は、ガス
絶縁機器の封入ガス漏れが一切生じていない場合
であつても、ガス絶縁機器内の封入ガスが温度に
依存して封入ガス圧が変化するガス圧特性を有す
る。さらにまた、上記のような特性を各々有する
圧力スイツチ検出特性とガス絶縁機器のガス圧特
性との関係は、特定の温度Toでは、共に共通の
圧力Poを有するものであるが、両者の温度依存
性の有無より特定温度To以上ではガス絶縁機器
のガス圧特性が基準ガス圧に対して差圧力を大き
くし、他方特定温度To以下ではガス絶縁機器の
ガス圧特性が基準ガス圧に対して差圧力を小さく
することから、両特性との間には高・低温度範囲
で圧力スイツチの検出誤差±△PEが生じること
となる。 In addition, the gas pressure characteristics of the gas-insulated equipment mentioned above are such that even if there is no leakage of the filled gas in the gas-insulated equipment, the filled gas in the gas-insulated equipment is a gas whose pressure changes depending on the temperature. It has pressure characteristics. Furthermore, the relationship between the pressure switch detection characteristics and the gas pressure characteristics of gas insulated equipment, each having the characteristics described above, is that at a specific temperature To, they both have a common pressure Po, but the temperature dependence of both is The gas pressure characteristics of gas insulated equipment increase the differential pressure with respect to the reference gas pressure at temperatures above a certain temperature To, and on the other hand, the gas pressure characteristics of gas insulated equipment increase the differential pressure with respect to the reference gas pressure at temperatures below a certain temperature To. Since the pressure is reduced, there will be a detection error of ±△P E of the pressure switch in the high and low temperature ranges between both characteristics.
そこで、本考案は上記のような点に鑑み、温度
に応じたガス等密度曲線上のガス圧力の基準値を
求め、これを検出ガス圧力と比較することによ
り、検出誤差がない温度補償圧力スイツチを提供
するものである。
Therefore, in view of the above points, the present invention creates a temperature-compensated pressure switch with no detection error by determining the reference value of gas pressure on the gas isodensity curve according to temperature and comparing this with the detected gas pressure. It provides:
第３図は本考案の一実施例による温度補償圧力
スイツチを示す構成図で、この圧力スイツチはデ
イジタル化されている。
FIG. 3 is a block diagram showing a temperature compensated pressure switch according to an embodiment of the present invention, and this pressure switch is digitalized.
近年、半導体技術の進歩により、ガス絶縁変電
機器で使用されるガス圧力範囲・温度範囲でも充
分に使用可能な半導体圧力センサが利用できるよ
うになつてきた。また、変電所においても監視・
制御装置がデイジタル化される傾向が強まつてき
ている。 In recent years, advances in semiconductor technology have made it possible to use semiconductor pressure sensors that can be used satisfactorily in the gas pressure and temperature ranges used in gas-insulated electrical substation equipment. We also monitor and monitor substations.
There is a growing trend toward digitalization of control devices.
すなわち、図示温度補償圧力スイツチはこのデ
イジタル化の要求に応じたもので、以下詳細に述
べると、１０はガス絶縁機器のタンク内のガス圧
力を検出する圧力検出部で、半導体圧力センサー
及びそれの持つ固有誤差を補正する回路が組込ま
れている。また１１は該タンク内のガス温度を検
出するガス温度検出器、１２はマイクロコンピユ
ータを内蔵していて、任意のガス等密度曲線を作
り出すことができ、上記検出温度に応じてその温
度時のガス等密度曲線上のガス圧力を計算して出
力する関数発生器で、その出力値は、その温度時
の温度補償されたガス圧力の基準値となる。しか
して、１３は関数発生器１２から出力される温度
補償されたガス圧力の基準値と上記圧力検出器１
０による検出圧力を比較することにより、ガス漏
れを検出するコンパレータであり、したがつて、
この実施例によれば、機械的接点は無く、実際の
ガス圧力と比較されるのが温度補償されたガス密
度曲線上の値となり、検出誤差は、理論上なくな
る。また、変電所の監視・制御装置の電子化・デ
イジタル化に充分対応できる温度補償圧力スイツ
チとなる。 In other words, the illustrated temperature-compensated pressure switch meets this demand for digitization.In detail below, numeral 10 is a pressure detection unit that detects the gas pressure in the tank of gas insulated equipment, and it includes a semiconductor pressure sensor and its A circuit is built in to correct the inherent errors. Further, 11 is a gas temperature detector that detects the gas temperature in the tank, and 12 is a built-in microcomputer that can create any gas isodensity curve. This is a function generator that calculates and outputs the gas pressure on the isopycnal curve, and its output value becomes the reference value of the temperature-compensated gas pressure at that temperature. 13 is the reference value of the temperature compensated gas pressure output from the function generator 12 and the pressure detector 1.
It is a comparator that detects gas leakage by comparing the detected pressure by 0, and therefore,
According to this embodiment, there is no mechanical contact point, and the value on the temperature-compensated gas density curve is compared with the actual gas pressure, so that detection errors are theoretically eliminated. In addition, the temperature-compensated pressure switch is fully compatible with the computerization and digitalization of substation monitoring and control equipment.
以上のように本考案によれば、ガス検出温度に
応じたガス等密度曲線上の温度補償されたガス圧
力基準値と実際の検出圧力値とを比較してガス漏
れを検出するようにしたので、検出誤差が理論上
なく、ガス漏れを確実に検出できる。また、デイ
ジタル構成としたので、変電所の監視・制御装置
の電子化・デイジタル化に充分対応できる温度補
償圧力スイツチとなる。
As described above, according to the present invention, gas leakage is detected by comparing the temperature-compensated gas pressure reference value on the gas isodensity curve corresponding to the gas detection temperature with the actual detected pressure value. , there is theoretically no detection error and gas leaks can be detected reliably. Moreover, since it has a digital configuration, it becomes a temperature compensated pressure switch that can fully support the computerization and digitalization of substation monitoring and control equipment.
第１図は従来の圧力スイツチを示す構成図、第
２図は第１図の検出特性を説明する特性曲線図、
第３図は本考案の一実施例を示すブロツク図であ
る。
１０……圧力検出器、１１……温度検出器、１
２……関数発生器、１３……コンパレータ。
Fig. 1 is a configuration diagram showing a conventional pressure switch, Fig. 2 is a characteristic curve diagram explaining the detection characteristics of Fig. 1,
FIG. 3 is a block diagram showing one embodiment of the present invention. 10...Pressure detector, 11...Temperature detector, 1
2...Function generator, 13...Comparator.
Claims (1)
する圧力検出器と、そのガス温度を検出する温度
検出器と、検出温度に応じたガス等密度曲線上の
温度補償されたガス圧力基準値を求める関数発生
器と、該ガス圧力基準値と上記圧力検出器による
検出圧力値とを比較してガス漏れを検出するコン
パレータとを具備したことを特徴とする温度補償
圧力スイツチ。 Find a pressure detector that detects the gas pressure in the tank of gas-insulated substation equipment, a temperature detector that detects the gas temperature, and a temperature-compensated gas pressure reference value on the gas isodensity curve according to the detected temperature. 1. A temperature compensated pressure switch comprising: a function generator; and a comparator that compares the gas pressure reference value with a pressure value detected by the pressure detector to detect gas leakage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14706383U JPS6055033U (en) | 1983-09-22 | 1983-09-22 | temperature compensated pressure switch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14706383U JPS6055033U (en) | 1983-09-22 | 1983-09-22 | temperature compensated pressure switch |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6055033U JPS6055033U (en) | 1985-04-17 |
| JPH0443944Y2 true JPH0443944Y2 (en) | 1992-10-16 |
Family
ID=30327151
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14706383U Granted JPS6055033U (en) | 1983-09-22 | 1983-09-22 | temperature compensated pressure switch |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6055033U (en) |
-
1983
- 1983-09-22 JP JP14706383U patent/JPS6055033U/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6055033U (en) | 1985-04-17 |
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