JPH01252116A - Gas insulated electrical machinery - Google Patents

Abstract

PURPOSE:To perform accurate monitoring of gas pressure, by obtaining pressure conversion values at respective positions based on values detected through one pressure sensor arranged in same gas section and a plurality of temperature sensors arranged at positions having different temperature and averaging the pressure conversion values based on volume ratios at respective positions. CONSTITUTION:A gas insulated bus 1 is arranged such that a section from the insulating spacer 3 of a disconnecting switch 4 in a building 2 to a bushing case 5 at the outside of the building 2 is defined as one gas section. Temperature sensors 8a, 8b are arranged respectively at the indoor section 1a and an outdoor section 1b of a bus 1, then their outputs are subjected to A/D conversion 9 and fed to a processing unit 10. Furthermore, a common pressure sensor 7 is provided and its output is subjected to A/D conversion and ted to a processing unit 10. The processing unit 10 calculates pressure conversion values at the points 1a, 1b, which are averaged based on volume ratios to produce a pressure level to be employed for monitoring of pressure in the gas section. By such arrangement, gas pressure can be monitored accurately at points having different temperature in same gas section through a simple device.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a gas insulated electrical device having a gas leak detection function.

(Prior Art) In recent years, gas-insulated electrical equipment in which a conductor is housed in a container filled with insulating gas has become mainstream in substations and the like because it allows for no maintenance or inspection. In this gas-insulated electrical equipment, leakage of insulating gas may reduce its dielectric strength and cause accidents such as dielectric breakdown, so it is necessary to detect the gas pressure of the insulating gas whose temperature has been compensated. .

A gas-insulated electric device having this gas leak detection function is known from, for example, Japanese Utility Model Application Publication No. 1981-1901, and has a configuration as shown in FIG. 3.

That is, one gas pressure sensor 21 and one temperature sensor 22 are installed for each device partitioned for the same gas.

Then, the arithmetic unit 25 corrects the gas pressure depending on the temperature, detects the gas pressure, and detects a gas leak.

However, if gas-insulated electrical equipment collapses in the same gas compartment and is installed indoors or outdoors, accurate gas leak detection cannot be performed.

That is, when the temperature sensor 22 is installed outdoors, the gas temperature increases due to one day of sunlight, so the gas pressure calculated based on the reference temperature 20'C becomes lower than the true gas pressure. Conversely, if the temperature sensor 22 is installed indoors, the calculated gas pressure will be lower than the true gas pressure.

As one method to solve this problem, it is conceivable to separate gas sections for each device placed indoors and outdoors and monitor each gas section, even if the same gas section has conventionally been used.

However, in this case, the number of pressure sensors 21 and temperature sensors 22 increases, which is economically disadvantageous, and the mounting increases the number of gas seals, which actually reduces reliability against gas leakage. Moreover, gas compartments are generally determined by the maintenance and inspection method for gas-insulated electrical equipment, and cannot be easily changed.

(Problems to be Solved by the Invention) As described above, in conventional gas-insulated electrical equipment, the arrangement of pressure sensors and temperature sensors in the same gas compartment is affected by external factors such as indoors and outdoors. ! Accurate gas monitoring could not be carried out because it was not done in consideration of temperature changes.

The present invention has been made in consideration of the above points, and it is an object of the present invention to provide a gas-insulated electric device that has a simple structure and can perform accurate gas monitoring.

[Structure of the invention]

(Means for Solving the Problems) In order to achieve the above object, in the present invention, a temperature sensor is provided for each of a plurality of parts that may have different temperatures due to external factors, and the temperature sensor and pressure sensor are connected to each other. A pressure conversion value for each part is calculated from the output, and the pressure is calculated by averaging the pressure conversion values based on the volume ratio.

(Function) As a result, gas pressure can be measured more accurately than in the conventional case where one temperature sensor is provided in the same gas compartment.

(Example) An example of the present invention will be described below with reference to FIG. In this embodiment, as an example, a gas insulated bus bar 1 is disposed indoors and outdoors. That is, inside the building 2, both sides are sealed with Ma sinter 3, and a disconnector 4 containing an insulating gas such as SF or gas and a contact portion 4a is disposed inside.

A circuit breaker (not shown) is connected to one side of the disconnector 4 via an insulating spacer 3, and an insulating spacer 3 is connected to the other side of the disconnector 4.
A gas insulated bus bar 1 is connected thereto.

This gas insulated bus bar 1 penetrates a building wall 2a of a building 2 and is connected to a bushing case 5 via an insulating spacer 3. In other words, the gas insulated bus bar 1 has an indoor area 1a and an outdoor area 1b.
It is divided into

And disconnector 4. Although the gas insulating base gi and the bushing case 5 are gas-stopped by an insulating spacer 3, a gas pipe 6 that can be opened and closed is connected between them. With this gas pipe 6, the disconnector 4, the gas insulated bus bar 1, and the bushing case 5 become the same gas compartment.

Further, a pressure sensor 7 is connected in the middle of a gas pipe 6 that connects the disconnector 4 and the indoor portion 1a of the gas insulated bus bar.

Furthermore, temperature sensors 8a and 8b are provided in the indoor part 1a and the outdoor part 1b of the gas insulated bus bar, respectively.

And pressure sensor 7. Temperature sensors 8a and 8b are each A
It is connected to the arithmetic processing bag Vi1o via the /D converter 9. This A/D converter 9 converts analog signals from the pressure sensor 7 and temperature sensors 8a, 8b into digital signals. Further, the arithmetic processing unit 10 compensates for the temperature of the entire same gas compartment by averaging the volume ratio of indoor and outdoor containers.

Next, the effects of the configuration of this embodiment will be explained.

In general, the relationship between temperature, pressure, and volume of an ideal gas is expressed by Boyle-Charles equation (1). Then, the indoor and outdoor temperatures are expressed as Ti, To, M, respectively, and the container volumes of internal and external gas insulated equipment as Vi, Vo, respectively. If the pressure of the entire same gas compartment is Px&, the following equation holds true if there is no leakage of insulating gas.

Neemka+" 2 companies. L T, ・・River・■■
Expressing the equation as the ratio of the reference temperature and pressure to the pressure at an arbitrary temperature, the following equation is obtained.

Furthermore, T is base 1! ! temperature, P is pressure at reference temperature, ■
is the volume of the entire same gas compartment (Vi + Vo).

Here 9 For example, V = 10rn', Vi = 3rn
', V0=7rn', T=20℃, Ti=20℃,
When To=35°C and P=5 bar at 20°C, Pg=5.1111 bar from equation (3).

In addition, when one pressure sensor and one temperature sensor are installed outdoors as in the conventional technology, the pressure conversion value to 20°C is P(
20)=-Video'5 Peek-P, 273+T P, (20) = 4.92 bar.

On the other hand, when one pressure sensor and one temperature sensor are installed indoors, the pressure conversion value to 20°C is PL(20) = 5.
It will be 17 bar.

On the other hand, if the converted indoor and outdoor pressure values are averaged by their respective volume ratios as in this embodiment.

Therefore, a good value can be obtained.

The gas pressure conversion values to sub-temperatures according to these conventional techniques and this embodiment are shown in FIG.

In this example, the cause of the temperature difference between one device was explained as the indoor/outdoor placement of the device, but there are other reasons such as a part of the device being colored or a different color, being close to a heat generating element, etc. There is.

〔Effect of the invention〕

As explained above, in the present invention, a temperature sensor is provided for each of a plurality of parts that may have different temperatures due to external factors, and a pressure conversion value for each part is calculated from the outputs of the temperature sensor and pressure sensor. Since the pressure is averaged using the volume ratio of this pressure conversion value, it is possible to provide gas-insulated electrical equipment that allows accurate gas monitoring.

[Brief explanation of the drawing]

Fig. 1 is a schematic configuration diagram of a gas insulated electrical equipment showing an embodiment of the present invention, Fig. 2 is a diagram showing the effects of the gas insulated electrical equipment shown in Fig. 1, and Fig. 3 is a conventional gas insulated electrical equipment. FIG. 1...Gas insulated bus bar, 1a...Indoor. 1b...Outdoor area, 2...Building. 2a... Building wall, 3... Insulating spacer, 4... Disconnector, 4a... Contact portion. 5...Bushing case, 6...Gas piping, 7...
・Pressure sensor, 8a, 8b...temperature sensor,
9... A/D converter lO... Arithmetic processing unit. Agent Patent Attorney Nori Chika Ken Tama Daikomaru Ken Figure 1 Only hli meat outside Figure 5 5yA counterfeit sensor according to the present invention Directly installed in the center of the HA SE7S
1 place

Claims (1)

[Claims] In a device in the same gas compartment having a plurality of parts that can have different temperatures due to external factors, a pressure sensor provided in the equipment, a temperature sensor provided for each of the plurality of parts, and a pressure sensor and a temperature sensor provided in each of the plurality of parts. A gas insulation system that is equipped with an arithmetic processing device that calculates a pressure conversion value for each part from the output of a temperature sensor, and averages this pressure conversion value based on the volume ratio of each part to calculate the pressure of the entire same gas compartment. electrical equipment.