JPS602009A - Gas insulated electric device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] This invention relates to electrical equipment without waste.

In recent years, gas-insulated electrical equipment, especially gas-insulated switchgear, has become widely used in order to address land and environmental issues. In addition, in the construction shown in Figure 1, a highly insulating gas (2) is sealed in the shell of the container +11, and a high voltage conductor (3
) is supported by a solid insulator (4), and SF6 gas is often used as the insulating gas.

However, if you are trying to manufacture something smaller and with better performance than the conventional one, f1-
It may be advantageous to use a gas that has good insulation properties.

The inventors thought of this and applied it under conditions where the gas does not completely liquefy due to its excellent insulating properties, and conventionally! : V is also intended to produce a small and high-performance product.The present invention will be explained in detail below. Table 1 shows the unsaturated fluorocarbon insulation scum obtained for carrying out the present invention. The total purity of the commercially available commercially available t-methane produced as a reagent and industrial product (7'C%) is also listed in Table 1.

Figure 2 shows the results of adding up all custom-made insulation gases for the insulating gases listed in Table 1. Insulating gas was sealed in the shell of the acrylic resin container of Table 21 at atmospheric pressure (20° C.), and the AC breakdown voltage was determined under the electrode conditions written in the figure. It can be seen that the breakdown voltage ratio with respect to SF6 is superior to SF6.

Since the insulating gas liquefies during use, which can cause problems, the vapor pressure characteristics were measured in order to clarify its characteristics, and the results are shown in FIG. A bong filled with each insulating gas in a liquid state was placed in a thermostatic chamber, and a pressure gauge was connected to each to measure the pressure at each temperature.The results showed a linear relationship between the vapor pressure and the reciprocal of the absolute temperature. , C1ausius
- It was found that there is a relationship according to the Clapayron equation.

1. For the insulating gas alone and fc in Table 1, consider the AC breakdown voltage under conditions that do not cause liquefaction of the mixed gas of the insulating gas and SF6 gas in Table 1. Equipment set pressure (PT)
Once determined, the following relationship will be obtained for the mixed gas of SF6 (k) of the insulating scum in the M1 table and SF6 gas.
+PSF6 (When PT > PFC) Pl here:
Set pressure (i#!2 vs. atmospheric pressure, 20°C) PFC: 1st f
Partial pressure of gas i at 20°C [absolute atmospheric pressure] Pspa: SF Partial pressure of gas a at 20°C (i
k: Mixing ratio of SF6 gas The AC breakdown voltage (Vm) of this mixed gas or single gas is estimated by the following formula.

Vm = VSF6 (k+(1-k) RFC/5F
6) Here vm: AC breakdown voltage of mixed gas (kv4m8) Vsp6
: AC breakdown voltage of SF6 gas Ck”rmB)RF9
/SF6: Breakdown voltage ratio of insulating gas to SF6 gas (see Figure 2) Relationship between Vm and PT ka Lower limit of operating temperature of the device -10"C
An example of plotting is shown in Figure 4. -20℃.

Similarly, a Vm-FT relationship diagram can be drawn for θ°C, IO'C, 20°C, and other lower limit temperatures.

These were obtained by clarifying the characteristics shown in Figures 2 and 3, and were obtained for the first time.
4F6-1.3 force', no cracks, no closure, good 1, etc. Assuming that the installation pressure is 4 atm (absolute), aim for the SF6 gas mixture ratio k, and the ratio of SF6 gas breakdown voltage Vnl/'V5p6. The results are shown in Tables 3 and 4. In Table 3, for example, taking the lower limit temperature θ° C. for C4F6-2 as an example, it is determined by the ratio of breakdown voltage to SF6 gas H1, 78. In addition, assuming a gas transformer - cubicle type GIs, ff subsizing, etc., and assuming that the installation pressure is 15 atm (absolute),
Even at the lower limit temperature of -20°C, the ratio of breakdown voltage to SF6 is 2.
It becomes 0. In this way, the equipment can be made into an older model due to its superior insulation properties.

Chapter 3: Table 4: Are there any off-the-shelf conventional SF6 gases? #, the gases with these compositions are placed in the equipment at the same gas pressure as before (here, 4 atm - pressure (
If filled to 1.5 atm (assumed absolute) and 1.5 atm (assumed to be absolute), the device will have a voltage rating of 1.78 times and 2.0 times tJ, respectively.SF6 gas in SF6 case insulated equipment
It is possible to raise the level of support by increasing the zero pressure, but in order to do so, it is necessary to change the pressure-resistant design of the equipment, such as increasing the wall thickness of the device, increase the weight of the equipment, and increase the weight of the equipment. I'm afraid this will lead to an increase in price. With the force composition according to this invention, the pumping pressure rating increases with the same gas pressure, making it possible to increase the rating of existing models. When the breakdown voltage was investigated after filling, as shown in Fig. 5, a ratio of AC breakdown voltage to SF6 of 2.1 was obtained. A value that exceeded the total (straight line in Figure 5) was measured.It was confirmed that the breakdown voltage was higher than the theoretical value due to the so-called mutual cooperation effect of the mixed gas components.

Although the above description has been made for a one-component system or a two-component system, similar effects can be expected for a system of three or more components. Also,
The lower limit temperature should be considered to vary by about 20 degrees Celsius in high-temperature areas, so the pressure below the vapor pressure at 20 degrees Celsius in the third layer is an effective range for the pressure of a single gas or the partial pressure of a mixed gas. According to this invention, the withstand voltage is improved by fully using the unsaturated fluorocarbon compound gas. Furthermore, by using a mixture of unsaturated fluorocarbon compound gas and SF6 gas in % (lD'), a mutual cooperative effect can be obtained, resulting in a further improvement in withstand voltage.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing a conventional gas 7F8 edge electric device, and Fig. 2 is a C4F6-2, C-C4F6, C4F of the present invention.
8-2 and C4Fg - An explanatory diagram showing the insulation characteristics comparing -1,3 gas and SF6 gas, Fig. 3 shows SF6, C4
F6-2, C-C4F6, C4F8-2 and c4Fa
Figure 4 shows the AC breakdown voltage (
An explanatory diagram showing the relationship between Vm) and mixed gas pressure CP7),
FIG. 5 is an explanatory diagram showing the entire relationship between the mixing ratio of SF6 and C4F6-2 and breakdown voltage. In the figure, 10, ill is the container, (λ) a high voltage conductor, (
4) is made of solid insulating material 〇Representative Masuo Oiwa Figure 1 LA ≧ Murshu Novus Figure 2 ~ 〉 MIJ? Voltage ladder f Fig. 3 j ML No. 3 (θ ('c) Fig. 4 Gauss no king power (Zettai Ki noe)

Claims (1)

[Claims] A conductor is disposed in a closed container filled with an insulating gas, and the conductor is supported by a solid insulating member, wherein the gas contains an unsaturated fluorocarbon compound. A gas insulated electrical device characterized by: [21 The gas insulated electrical device according to claim 1, characterized in that it is an unsaturated fluorocarbon compound fJ-C4F@-2. 3. A gas insulated electrical device according to claim 2, characterized in that (ata). (4) The gas-insulated electrical device Ot[il C-C4F6 according to claim 1, which is an unsaturated fluorocarbon compound Hc-C4F6, has an upper limit of the sealing pressure at 20°C. .15 (ata) Gas insulated electrical device according to claim 4 @ (6) The gas insulated electrical device according to claim 4 which is characterized in that it is an unsaturated fluorocarbon compound fic4Fg-2 A gas insulated electrical device according to scope 1. [71C4F5 2 fl The gas-insulated electrical device according to claim 6, wherein the upper limit of the sealing pressure at 20° C. is 2.29 (ata). (8) Unsaturated fluorocarbon compound r C4F6 1 *
Gas-insulated electric device O +9I C4F6-1.3 fl: The upper limit of the sealing pressure at 20° C. is 1.89 (ata). A gas insulated electrical device according to claim 8, characterized in that: (lO) All conductors are arranged in a closed container circle filled with an insulating gas, and the conductors are supported by a solid insulating member, in which an unsaturated fluorocarbon compound and SF6 are mixed δ in the gas. A gas insulated electrical device with all the features of a mechanical device.