JPH09154231A - Power transmission system using gas insulated pipeline - Google Patents

Abstract

PROBLEM TO BE SOLVED: To decrease the occurrence of insulation accidents due to surge voltage by lowering incoming overvoltage than those restricted by zinc oxide lightening arrestors for power station and substation by providing a surge damper tank equipment for attenuating the surge between a gas insulated pipeline and zinc oxide type lightening arrestors at power station and substation. SOLUTION: Surge damper equipment 40 are provided between a gas insulated pipeline 5 and zinc oxide lightening arrestors 6 in a power station and a substation at side 1 and between the gas insulated pipeline 5 and zinc oxide lightening arrestors 7 in a power station and substation at side 2. By doing this, an attenuation effect of the surge damper equipment 40 against surge or a surge restricting effect by zinc oxide lightening arrestors 6 and 7 located scatteredly in power station and substations are able to make overvoltage (surge voltage) generated in gas insulated pipeline 5 in a transmission system lower than the values restricted by zinc oxide lightening arrestors 6 and 7 for power station and substations. Therefore, the occurrence of insulation accidents due to surge voltage can be reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to improvement of a gas-insulated pipeline power transmission system, and more particularly, to a gas-insulated pipeline system that interconnects power generation substations and between the gas-insulated pipeline system and the power generation substation. The present invention relates to a gas-insulated pipeline transmission system equipped with a zinc oxide type lightning arrester for a power substation.

[0002]

2. Description of the Related Art A gas-insulated pipeline power transmission system generally used in the past, that is, a gas-insulated pipeline power transmission system connecting a power plant substation to a power plant substation, is shown in FIG.
A gas-insulated pipeline system 5 that connects the substations 1 and 2 is provided.
Further, zinc oxide type lightning arresters 6 and 7 for a power plant are provided between the gas-insulated pipeline system 5 and the power plant. The insulation coordination of the gas-insulated pipeline system 5 is ensured by the zinc oxide type arresters 6 to 9 installed at both substations.

[0003] As an example related to this type of gas-insulated pipeline power transmission system, there is, for example, JP-A-1-166662.

[0004]

In the gas-insulated pipeline transmission system thus formed, the zinc oxide type lightning arresters installed at both substations ensure the insulation coordination of the gas-insulated pipeline system. However, in this gas-insulated pipeline transmission system, if the gas-insulated pipeline becomes a long distance of several hundred meters or more, if an insulation accident occurs, the recovery work is not easy and it takes a lot of time. When it comes to costly and replacing a long-distance gas-insulated pipeline, work inside a narrow cave is more difficult than new construction.

The present invention has been made in view of the above circumstances, and an object thereof is to suppress the inrush overvoltage than that of a zinc oxide type arrester for a power substation, and to prevent the occurrence of insulation accident. To provide an insulated pipeline power transmission system.

[0006]

That is, the present invention is provided with a gas-insulated pipeline system for connecting power generation substations and a zinc oxide type lightning arrester for the power transformation substation between the gas insulation pipeline system and the power transformation substation. In a gas-insulated pipeline power transmission system, a surge damping device that attenuates surges is provided between the zinc oxide type lightning arrester for power plant and substation and the gas-insulated pipeline system so as to achieve the intended purpose. It is the one.

Further, the present invention provides a gas-insulated pipeline system for connecting the substations, and a gas-insulated pipeline provided with a zinc oxide type lightning arrester for the substation between the gas-insulated pipeline system and the substation. In the power transmission system, a surge damping device that attenuates surge is provided between the zinc oxide type lightning arrester for power plant and substation and the gas-insulated pipeline system, and between the surge damping device and the gas-insulated pipeline system. A zinc oxide type lightning arrester is provided.

Further, in a gas-insulated pipeline transmission system connecting the power transmission and transformation substations and a zinc oxide type lightning arrester for the power transformation substation between the gas insulation pipeline system and the power transformation substation. The zinc oxide lightning arresters are distributed in the gas-insulated pipeline system along the gas-insulated pipeline of the gas-insulated pipeline system.

That is, in the case of the gas-insulated pipeline transmission system formed as described above, the surge of the zinc oxide type lightning arresters is used by utilizing the damping effect of the surge damping device against the surge and / or distributed in the middle of the gas pipeline. Due to the suppression effect, the overvoltage generated in the gas-insulated pipeline power transmission system can be suppressed to a value lower than the value suppressed by the zinc oxide type lightning arrester for power substations. It can be made lower than suppression, and the occurrence of insulation accidents can be reduced.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the illustrated embodiments.

[0011]

First Embodiment FIG. 1 is a diagram showing the gas-insulated pipeline power transmission system. This figure shows a case in which two substations (which may be switching stations) 1 and 2 are connected to transmission lines 3 and 4, and two substations are connected by a gas-insulated pipeline 5.

Such insulation coordination between the power substations 1 and 2 and the gas insulation pipeline 5 is generally ensured by the zinc oxide type lightning arresters 6 to 9 for the power substation as described above. However, when the gas-insulated pipeline 5 is longer than several hundred meters, the overvoltage generated in the gas-insulated pipeline 5 is made lower than the zinc oxide surge arresters 6-9 for the power plant and substation can suppress, for example, several tens%. It is desired to reduce the degree to some extent and improve the reliability of the insulation of the gas insulation pipeline 5.

Therefore, as shown in FIG. 1, an RL surge damping device 40 for surges composed of a resistor 10 and a reactor 11 arranged in parallel on the side of the power substation 1 is provided with a zinc oxide surge arrester 6 for the power substation and a gas insulation line 5. Similarly, a surge damping device 40 for surges, which is composed of a resistor 12 and a reactor 13 connected in parallel, is also provided on the power substation 2 side.

FIG. 8 shows the examination results of the system thus formed. That is, as compared with the conventional case of FIG. 7, in the case of FIG. 1 of the present invention, the effect of reducing the lightning surge voltage of the gas insulating conduit 5 by about 30% is obtained. In the examination of FIG. 8, a resistance of several hundred Ω and a reactor of several hundred μH are used. The values of resistance or reactor at both substations are the same. The effect appears when the resistance value is set to the surge impedance of the gas-insulated pipeline or higher. The reactor value is selected so that the time constant of the surge damping device is about sub-μs or more.

As described above, according to the present embodiment, there is an effect that the overvoltage which enters the gas-insulated pipeline power transmission system can be made lower than that which is suppressed only by the zinc oxide type lightning arrester for the power substation.

[0016]

Second Embodiment FIG. 2 shows another embodiment. Here, zinc oxide elements 14 and 15 are provided in parallel with the RL surge damping device including the resistor and the reactor shown in FIG. In this way, when an abnormally high voltage is applied to the resistor and the reactor, this is suppressed, and there is an effect that the dielectric breakdown of the resistor or the reactor can be prevented.

[0017]

Third Embodiment FIG. 3 shows another embodiment. Here, a CR surge damping device including a capacitor 16 and a resistor 17 in series between the RL surge damping device including the resistor 10 and the reactor 11 on the side of the substation 1 of FIG. A similar surge damping device is also provided on the power transmission and transformation substation 2 side. By doing so, there is an effect that the overvoltage that enters the gas-insulated pipeline power transmission system can be made lower than that in FIG.

[0018]

Fourth Embodiment FIG. 4 shows another embodiment. Here, a zinc oxide type arrester 20 is provided between the RL surge damping device composed of the resistor 10 and the reactor 11 on the side of the power substation 1 in FIG. A zinc oxide type arrester 21 is provided. This has the effect of reducing the overvoltage that enters the gas-insulated pipeline power transmission system with higher reliability than in FIG.

[0019]

Fifth Embodiment As shown in FIG. 9, a predetermined number of ring-shaped ferrite cores 41 can be fitted into the high-voltage conductor 23 of the gas-insulated conduit or the gas bus bar near the zinc oxide type lightning arrester for a power substation. There is a ring-shaped ferrite core that has a characteristic that loss is negligible at commercial frequencies and loss is high at high frequencies such as lightning surges, that is, attenuation is large. This has the effect of making it possible to reduce the overvoltage that enters the road power transmission system, compared to the case where it is suppressed only by the zinc oxide type lightning arrester for substation.

Compared to the other embodiments, this embodiment has an effect that the structure is simple and the reliability is high. Further, FIG.
In some cases, it is possible to provide a surge damping device composed of a resistor and a reactor.

[0021]

Sixth Embodiment FIG. 5 shows a structural example of the RL surge damping device of FIG. The RL surge damping device is provided between the high voltage conductors 23 and 24 in the pressure vessel 22, and SF6 gas is used for insulation. In the RL surge damping device, the resistor 25 and the reactor 26 are concentrically configured,
It is connected to the terminals 27 and 28 and the electric field is relieved by the shield 29. With this embodiment, the RL surge damping device has an effect that it can be easily connected to the gas insulated switchgear.

[0022]

Seventh Embodiment FIG. 6 shows another configuration of overvoltage suppressing configuration. Dispersed zinc oxide type lightning arrester 30 in the middle of gas-insulated line
Is provided. When connecting both substations with a cable,
It is uneconomical to install a zinc oxide type arrester on the way,
Generally not done. However, it is possible to install the gas-insulated tank type zinc oxide arrester in the middle of the gas-insulated pipeline as in the case of a general gas-insulated switchgear, and the zinc oxide surge arresters can be distributed and arranged at appropriate positions in the gas-insulated pipeline .

The distributed arrangement interval is selected according to the expected surge voltage waveform. According to such an embodiment, the interval between the zinc oxide type arresters can be made narrower, and the overvoltage that invades the gas-insulated pipeline power transmission system can be reduced as compared with the case where only the zinc oxide type arrester for a power substation is suppressed.

[0024]

As described above, according to the present invention, in a gas-insulated pipeline power transmission system, damping against surge is provided between the zinc-oxide type arrester for a gas-insulated pipeline side substation and the gas-insulated pipeline power transmission system. By installing a device and / or disposing zinc oxide type lightning arresters in the middle of the gas insulated pipeline, the overvoltage generated in the gas insulated pipeline power transmission system can be lower than the value suppressed by the zinc oxide type arrester for the power substation. It is possible to obtain this type of gas-insulated pipeline power transmission system that can be suppressed to a low level and that causes less insulation accidents.

[Brief description of the drawings]

FIG. 1 is a system diagram showing an embodiment of a gas insulated pipeline power transmission system of the present invention.

FIG. 2 is a system diagram showing another embodiment of the gas insulated pipeline power transmission system of the present invention.

FIG. 3 is a system diagram showing another embodiment of the gas-insulated pipeline power transmission system of the present invention.

FIG. 4 is a system diagram showing another embodiment of the gas insulated pipeline power transmission system of the present invention.

FIG. 5 is a vertical cross-sectional side view of the RL surge damping device of the present invention.

FIG. 6 is a system diagram showing another embodiment of the gas insulated pipeline power transmission system of the present invention.

FIG. 7 is a system diagram showing a conventional gas-insulated pipeline power transmission system.

FIG. 8 is a characteristic diagram showing a result of lightning surge analysis.

FIG. 9 is a vertical sectional side view showing another embodiment of the gas-insulated pipeline system of the present invention.

[Explanation of symbols]

1, 2 ... Power substation, 5 ... Gas-insulated pipelines, 6, 7, 8, 9
… Zinc oxide type arrester for power substations, 10, 12… Resistance, 1
1, 13 ... Reactor, 14, 15 ... Zinc oxide element, 1
6, 18 ... Capacitor, 17, 19 ... Resistor, 20, 21
… Zinc oxide type arrester for gas insulated pipeline, 25… Resistor, 2
6 ... Reactor, 30 ... Dispersed zinc oxide type arrester, 40 ...
Surge damping device.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Yoichi Oshita Yoichi Oshita 7-2-1 Omika-cho, Hitachi City, Ibaraki Prefecture Hitachi, Ltd. Electric Power & Electrics Development Headquarters (72) Inventor Kenichi Natsui Omika, Hitachi City, Ibaraki Prefecture 7-2-1 Machi, Ltd. Electric Power & Electric Development Division, Hitachi, Ltd.

Claims (10)

[Claims] 1. A gas-insulated pipeline system for interconnecting power generation substations, and a gas-insulated pipeline power transmission system comprising a zinc oxide surge arrester for the power transformation substation between the gas insulation pipeline system and the power transformation substation. A gas-insulated pipeline transmission system, characterized in that a surge damping device for damping a surge is provided between the zinc oxide surge arrester for a power plant and substation and the gas-insulated pipeline system. 2. In a gas-insulated pipeline system that connects the power stations and substations, and a gas-insulated pipeline transmission system that includes a zinc oxide surge arrester for the power station and substation between the gas-insulated pipeline system and the power station and substation. A surge damping device is provided between the zinc oxide surge arrester for the power plant and substation and the gas-insulated pipeline system, and a zinc oxide-type surge arrester is provided between the surge damping device and the gas-insulated pipeline system. A gas-insulated pipeline transmission system characterized by being equipped with a lightning arrester. 3. The gas insulated pipeline power transmission system according to claim 1, wherein the surge damping device is formed of a parallel circuit of a resistor and a reactor. 4. The gas insulated pipeline power transmission according to claim 3, wherein the resistance value is selected to be surge impedance of the gas insulated pipeline or more, and the value of the reactor is selected so that the time constant of the surge damping device is sub-μs or greater. system. 5. The gas-insulated pipeline transmission system according to claim 3, wherein a zinc oxide element is connected in parallel with the surge damping device. 6. The gas according to claim 1, wherein the surge damping device is composed of a parallel resistor and a reactor, and a capacitor and a resistor connected in series to the ground between the surge damping device and the gas insulating pipeline. Insulated pipeline power transmission system. 7. The surge damping device comprises a resistor and a reactor connected in parallel, and a zinc oxide type arrester is connected to the ground between the surge damping device and the gas-insulated pipeline. Gas-insulated pipeline transmission system. 8. A gas-insulated pipeline power transmission system according to claim 1, wherein a predetermined number of ring-shaped ferrite cores are fitted in a high-voltage conductor of the gas-insulated pipeline or gas bus bar near the zinc oxide surge arrester for a power substation. . 9. A gas-insulated pipeline transmission system that connects gas-insulated substations and a zinc oxide surge arrester for the power-substation between the gas-insulated pipeline system and the substation. A gas-insulated pipeline power transmission system, wherein zinc oxide type arresters are distributed in the gas-insulated pipeline system along the gas-insulated pipeline of the gas-insulated pipeline system. 10. The surge damping device includes a parallel circuit of a resistor and a reactor, and a gas-insulated container that houses the resistor and the reactor.
0 gas-insulated pipeline transmission system.