JPH10340814A - Device for connecting electric equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the stress load on an insulating spacer, by providing pressure differences in steps in the charging pressure of an insulating medium enclosed in a liquid-filled electric apparatus, etc., forming the central part of the insulating spacer in a projecting state, and then, positioning the spacer on the side on which the charging pressure of the insulating medium is higher. SOLUTION: A gas pressure detector 10 always detects the pressure of an insulating gas 6 in an intermediate chamber 5 and, when a failure occurs in an insulating spacer 7A, the pressure of the gas 6 in the chamber 5 drops, because the gas 6 is mixed in insulating oil 2 the pressure of which is lower than that of the gas 6. The detector 10 detects the pressure drop in the chamber 5 and issues an alarm by actuating a lamp, buzzer, etc. When the failure occurs in ANOTHER spacer 7B, an insulating gas 4 is mixed in the insulating gas 6 the pressure of which is lower than that of the gas 4. Therefore the pressure of the gas 6 in the chamber 5 rises, and the detector 10 detects the abnormal pressure in the chamber 5 and issues an alarm by actuating the lamp, buzzer, etc.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a connection apparatus for electric equipment, and more particularly to a liquid insulation electric equipment such as an oil-filled transformer using oil as an insulation medium and a gas insulation using gas as an insulation medium. The present invention relates to an electric device connecting device suitable for connecting a gas-input electric device such as a switchgear.

[0002]

2. Description of the Related Art Substations and the like for efficiently transmitting electric power are provided with many electric devices, but there are problems in transporting, carrying in, or manufacturing the devices. And they need to be electrically connected to the power receiving end.

However, as in the case of connecting an oil-filled transformer in which the filling pressure of insulating oil is about atmospheric pressure and a gas insulated switch in which the filling pressure of insulating gas is several atmospheres or more,
If the insulation media and the pressure of each device are different, careful measures must be taken in connecting the devices.

[0004] As described above, when attempting to directly connect devices having different pressures of the insulating medium, there is a possibility that the insulating gas insulating the inside of the gas insulated switch leaks into the oil-filled transformer for some reason. Comes out. Conventionally, to prevent this, an intermediate oil chamber filled with insulating oil was provided between the oil-immersed transformer and the gas-insulated switchgear, a conservator was connected to this intermediate oil chamber, and the conservator leaked into the intermediate oil chamber. Insulating gas was detected.

However, the gas leak detection by this conservator does not work unless the gas phase (leakage gas) and the liquid phase (leakage insulating oil) are separated, so that the insulating gas gradually dissolves in the insulating oil. There is a problem that detection is difficult in the state.

To solve this problem, for example, Japanese Patent Application Laid-Open
Japanese Patent Application Laid-Open No. 58-28812 (hereinafter referred to as a known example) has been proposed. This known example, as shown in FIG.
Between the oil-immersed transformer 101 in which the insulating oil 102 is sealed and the gas line 103 of the gas-insulated switch in which the insulating gas 104 is sealed, the conical insulating spacers 107A and 107A are provided.
7B are arranged so that the concave portions thereof face each other, and
5 and a small amount of insulating gas 10
And a pressure gauge 110 which communicates with the buffer chamber 105 and has a contact for detecting a leak of the insulating gas 106 and issuing an alarm when the gas pressure in the buffer chamber 105 drops. is there.

[0007]

However, in the case of the above-mentioned known example, the convex portion of the insulating spacer 107A faces the oil-filled transformer 101 side lower than the gas pressure in the buffer chamber 105, and the insulation due to the pressure difference is caused. The stress on the spacer 107A is large. That is, this is shown in FIG.
As shown in FIG. 6, when an outwardly directed force is applied to a normal pipe, the pipe becomes stable in maintaining the circular shape of the cross section. However, as shown in FIG. This is because it becomes very unstable in maintaining the circular shape of the cross section.

Also, the pressure difference between the filling pressure of the insulating gas 106 in the buffer chamber 105 and the pressure of the insulating gas 102 on the oil-filled transformer 101 side is substantially the same as that of the insulating gas 104 on the gas line 103 side. Is set to Therefore, the insulating spacer 1
07A, the pressure of the insulating gas 106 in the buffer chamber 105 decreases.
However, when a failure occurs in the insulating spacer 107B, there is no pressure difference between the pressure of the insulating gas 106 in the buffer chamber 105 and the pressure of the insulating gas 104 in the gas pipe 103. It cannot be detected by the total 110. Therefore, when there is a defect in the insulating spacer 107B between the buffer chamber 105 and the gas line 103, not only this defect cannot be detected, but also the oil-filled transformer 101 and the gas line 103 have one. Since the connection is made by the insulating spacer, if the insulating spacer 107A is further defective, the oil-filled transformer 101 may develop into a serious accident.

The present invention has been made in view of the above points,
It is an object of the present invention to provide an electric device connecting device that reduces a stress load on an insulating spacer and reliably prevents a failure of the insulating spacer. Further, even if there is a defect in the insulating spacer, the defect can be reliably detected.

[0010]

According to the present invention, in order to achieve the above object, a liquid-filled electrical device using oil or liquid as an insulating medium and a gas-filled electrical device using gas as an insulating medium are provided. Are connected by way of an intermediate chamber, which is divided by an insulating spacer and is filled with an insulating gas as an insulating medium, in the liquid-filled electrical device, the intermediate chamber, and the gas-filled electrical device. A stepwise pressure difference is provided to the filling pressure of the insulating medium, and the vicinity of the center of the insulating spacer is formed in a convex shape, and the convex side is located on the side where the filling pressure of the insulating medium is higher. I do.

Further, by providing the intermediate chamber with a gas pressure detecting device having a contact for giving an alarm when the gas pressure in the intermediate chamber rises or falls, even if the insulating spacer has a problem, Can be reliably detected.

[0012]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an electric equipment connecting apparatus according to the present invention.

FIG. 1 shows a first embodiment of the electrical equipment connection apparatus of the present invention. In the figure, reference numeral 1 denotes an oil-immersed transformer, which is a liquid-filled electrical device, and 3 denotes a gas pipe of a gas-insulated switchgear, which is a gas-filled electrical device. Insulation oil 2 having a filling pressure of about atmospheric pressure is contained in an oil-immersed transformer 1, and a filling pressure of 5 kgf is contained in a gas pipe 3.
The insulating gas 4 of about / cm ² is respectively sealed. Insulating spacers 7A and 7B are provided between the oil-immersed transformer 1 and the gas pipe 3.
There is an intermediate chamber 5 partitioned by an insulating gas 6 filled in the intermediate chamber 5 at a pressure of about ² to 3 kgf / cm ^2.
Is enclosed.

As is apparent from the above, in this embodiment, the filling pressure of the insulating medium is set to be the highest in the gas pipe 3 and then in the intermediate chamber 5 so that the oil-filled transformer 1 has the lowest pressure. Is provided. The insulating spacers 7A and 7B are formed of epoxy mold resin, and the embedded conductors 8A and 8B provided near the center of the insulating spacers 7A and 7B electrically connect the oil-immersed transformer 1 to the gas insulated switchgear. 9 is supported. The insulating spacers 7A, 7B 'are in the vicinity of the conductor support portions 7A', 7B '.
7A ", 7B" for attachment to each electrical device 7B and the intermediate chamber 5
The insulating spacer 7A is formed in a convex shape protruding toward the intermediate chamber 5 side, and the insulating spacer 7B is formed in a protruding shape protruding toward the gas pipe 3 side.

More specifically, for the insulating spacer 7A, the conductor supporting portion 7A 'protrudes from the mounting portion 7A "toward the insulating gas 6, and similarly, for the insulating spacer 7B, the conductor supporting portion 7B' is mounted. The portion protrudes from the portion 7B ″ toward the insulating gas 4 side. Furthermore, each insulating spacer 7A, 7B
It has a tapered shape inclined from the mounting portions 7A ", 7B" toward the conductor support portions 7A ', 7B'. Further, a gas pressure detecting device 10 is installed in the intermediate chamber 5 via a thin tube 11, and a gas valve 12 is provided in the middle of the thin tube 11.
An insulating gas is sealed in the intermediate chamber 5 by the gas valve 12. The gas pressure detecting device 10 constantly measures the gas pressure in the intermediate chamber 5, and when an abnormal gas pressure is detected, an alarm contact is activated.

Next, the operation will be described. The gas pressure detecting device 10 constantly measures the pressure of the insulating gas 6 in the intermediate chamber 5. Here, if a defect occurs in the insulating spacer 7A, the insulating gas 6 is mixed into the insulating oil 2 having a relatively lower pressure than the insulating gas 6, so that the insulating gas 6 in the intermediate chamber 5 is not mixed.
Pressure drops. Then, the gas pressure detecting device 10 detects the pressure drop in the intermediate chamber 5 and issues an alarm such as a lamp or a buzzer.

Next, when a defect occurs in the insulating spacer 7B, the insulating gas 4 is mixed into the insulating gas 6 having a relatively lower pressure than the insulating gas 4. For this reason, the pressure of the insulating gas 6 in the intermediate chamber 5 increases, and the gas pressure detecting device 10 detects the pressure abnormality in the intermediate chamber 5 and issues an alarm such as a lamp or a buzzer.

Therefore, even if a problem occurs in the insulating spacers 7A and 7B for insulating the oil-filled transformer 1 and the gas pipe 3, it is possible to reliably detect the problem.

The insulating spacers 7A and 7B are provided with conductor supporting portions 7A 'and 7B' for attaching portions 7A "between the oil-filled transformer 1 and the intermediate chamber 5, and attaching portions 7B" between the intermediate chamber 5 and the gas pipe 3. Since it is shaped to protrude more toward the high pressure side, a sufficiently stable shape can be maintained even with an epoxy mold resin that is relatively weak in tension.

According to this embodiment, the convex portions of the insulating spacers 7A and 7B face the high pressure side of the filling pressure of the insulating medium, so that the stress load due to the pressure difference can be stably received. it can. In addition, a pressure difference is sequentially provided for each chamber, and the pressure difference between the adjacent chambers is reduced via the insulating spacers 7A and 7B.
The stress applied to A and 7B can be further reduced. Further, since the pressure in the intermediate chamber 5 is large and the gas pressure is easily detected because the volume of the intermediate chamber 5 is small, the gas pressure in the intermediate chamber 5 can be detected with high sensitivity. It is possible to reliably determine whether the raised insulating spacer is the insulating spacer 7A on the oil-filled transformer 1 side or the insulating spacer 7B on the gas pipe 3 side when viewed from the intermediate chamber 5, and it is possible to determine a defective portion. Become. Further, since no penetrating insulator is used, the area occupied by the device can be made smaller than before, and the conductor connection portion of the device can be made simple.

FIG. 2 shows a second embodiment of the present invention. In the embodiment shown in the figure, a plurality of intermediate chambers partitioned by insulating spacers 7A, 7B, 7C (two in the embodiment, 5α and 5β) are provided.
The gas pressure in each of the intermediate chambers 5α and 5β is sequentially changed. For example, 2.3 kgf / c of insulating gas 6α in the intermediate chamber 5α
to about m ^2, 3.6 kgf insulating gas 6β in the intermediate chamber 5β
/ Cm ² .

By doing so, the pressure difference between the adjacent electric devices 1 and 3 and the insulating medium in the intermediate chambers 5α and 5β can be further reduced, and the insulating spacers 7A and 7
It is possible to reduce the stress burden applied to B and 7C, and to obtain a connection device for oil-filled electric equipment and gas-filled electric equipment in consideration of safety against leakage of high-pressure gas. In this case, the dimensions of the equipment are slightly larger, but by reducing the size of the intermediate chamber, it is possible to absorb the increase in dimensions. Can be

FIGS. 3 and 4 show a third embodiment and a fourth embodiment of the present invention, respectively. Figure 1 above,
In the embodiment shown in FIG. 2 and FIG.
The above description has been given of the case where the oil-filled transformer 1 is arranged horizontally with respect to the ground and connected to the ground, but as shown in FIG. 3, the oil-filled transformer 1 is arranged horizontally with respect to the ground. When the gas pipe 3 is disposed at a right angle and the intermediate chamber 5 disposed between the two is located at a right angle, or as shown in FIG. The gas pipe 3 is disposed at right angles to the oil-filled transformer 1 as in FIG. 3, but the intermediate chamber 5 disposed between the two is located on the gas pipe 3 side. Even in such a case, a similar effect can be obtained by adopting the configuration of the embodiment of FIG. 1 described above.

In each of the embodiments described above, an example of an oil-immersed transformer using insulating oil as an insulating medium has been described. However, it is a matter of course that an electric device (transformer) using an insulating liquid may be used.

[0025]

According to the electrical equipment connecting apparatus of the present invention described above, the liquid-filled electrical equipment using oil or liquid as the insulating medium and the gas-filled electrical equipment using gas as the insulating medium are connected. In an electric device connecting device which is divided by an insulating spacer and connected through an intermediate chamber filled with an insulating gas as an insulating medium, the electric device is sealed in the liquid-filled electric device, the intermediate room, and the gas-filled electric device. A pressure difference is provided stepwise to the filling pressure of the insulating medium, and the vicinity of the center of the insulating spacer is formed in a convex shape such that the convex side is located at a higher filling pressure of the insulating medium. Therefore, the stress load on the insulating spacer can be reduced, and the problem of the insulating spacer can be prevented.

Further, by providing the intermediate chamber with a gas pressure detecting device having a contact for giving an alarm when the gas pressure in the intermediate chamber rises or falls, even if the insulating spacer has a defect, Can be reliably detected.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a first embodiment of the electrical device connection device of the present invention.

FIG. 2 is a cross-sectional view showing a second embodiment of the electrical device connection device of the present invention.

FIG. 3 is a cross-sectional view showing a third embodiment of the electrical device connection device of the present invention.

FIG. 4 is a cross-sectional view showing a fourth embodiment of the electrical device connection device of the present invention.

FIG. 5 is an embodiment showing a conventional electrical equipment connection device.

FIG. 6 is an explanatory diagram when a force is applied to a cross section of a pipe.

[Explanation of symbols]

1: oil-immersed transformer, 2: insulating oil, 3: gas pipe, 4, 6, 6
α, 6β: insulating gas, 5, 5α, 5β: intermediate chamber, 7A,
7B, 7C ... insulating spacers, 7A ', 7B', 7C '...
Conductor support portion, 7A ", 7B", 7C "... Mounting portion, 9 ... Conductor, 10 ... Gas pressure detecting device, 11 ... Narrow tube, 12 ... Gas valve.

Claims (8)

[Claims] An insulating spacer separates a liquid-filled electrical device using oil or liquid as an insulating medium from a gas-filled electrical device using gas as an insulating medium. An electrical device connecting device connected via an intermediate chamber filled with a liquid-filled electrical device, an intermediate chamber, and a gas-filled electrical device. An electrical connection device, wherein the vicinity of the center of the insulating spacer is formed in a convex shape, and the convex side is located on the side where the filling pressure of the insulating medium is higher. 2. The electric equipment connection according to claim 1, wherein the filling pressure of the insulating medium is highest in the insulating medium sealed in the gas-filled electric equipment and lowest in the liquid-filled electric equipment. apparatus. 3. The insulating spacer has ends located at least at both ends of the intermediate chamber, both ends of the intermediate chamber being one end of the liquid-filled electrical equipment, and the other being the gas-filled electrical equipment. 3. The electrical equipment connection according to claim 1, further comprising a tapered shape that is attached to an end of the insulating spacer and that is inclined from the mounting portion of the insulating spacer toward the convex portion. 4. apparatus. 4. A buried conductor is provided on a convex portion of the insulating spacer, and the buried conductor supports a conductor for electrically connecting the liquid-filled electrical device and the gas-filled electrical device. The electrical equipment connection device according to claim 1, 2, or 3. 5. The electrical equipment connection according to claim 1, wherein a plurality of said intermediate chambers are provided, and a pressure difference is provided between the insulating gas sealed in each of the intermediate chambers. apparatus. 6. A gas pressure detecting device having a contact point for issuing an alarm when the gas pressure in the intermediate chamber rises or falls is provided in the intermediate chamber.
The electrical equipment connection device according to 2, 3, 4, or 5. 7. An insulated spacer separates a liquid-filled electrical device using oil or liquid as an insulating medium from a gas-filled electrical device using gas as an insulating medium. In the electrical equipment connection device connected via an intermediate chamber in which the gas-filled electrical equipment is arranged in a direction perpendicular to the horizontal direction in which the liquid-filled electrical equipment is arranged, and at a right angle thereof, An intermediate chamber is located, and a stepwise pressure difference is provided to the filling pressure of the insulating medium sealed in the liquid-filled electric equipment, the intermediate chamber, and the gas-filled electric equipment, and the vicinity of the center of the insulating spacer is made convex. The electrical device connecting device, wherein the convex portion side is located at a higher filling pressure of the insulating medium. 8. A gas-filled electrical device using oil or liquid as an insulating medium and a gas-filled electrical device using gas as an insulating medium are separated by insulating spacers, and the insulating gas is used as an insulating medium. In the electrical equipment connection device connected via an intermediate chamber in which the liquid-filled electrical equipment is arranged, the intermediate chamber and the gas-filled electrical equipment are arranged in a direction perpendicular to the horizontal direction in which the liquid-filled electrical equipment is arranged. The filling pressure of the insulating medium sealed in the device, the intermediate chamber, and the gas-filled electric device is provided with a stepwise pressure difference, and the vicinity of the center of the insulating spacer is formed in a convex shape. An electrical equipment connection device, characterized in that the filling pressure is higher.