CN1071503C - Gas insulation tube - Google Patents

Abstract

The purpose of the present invention is to shorten the length of the phase-separated bus extending from the three-phase collective bus to the side away from the main bus, thereby reducing the floor area of the power distribution station. For this reason, the gas-insulated bushings of each phase arranged in an isosceles triangle, the through-shaped current transformers of each phase, the voltage transformers for metering of each phase, the main bus, the line unit, the three-phase collective bus, and the distribution of each phase In the gas-insulated switchgear composed of gas-insulated busbars, etc., the through-shaped current transformer is arranged directly under the bushing, and the metering voltage transformer is extended to the end of the gas-insulated busbar C near the main busbar. The out state is set horizontally.

Description

Gas Insulated Switchgear

The invention relates to a gas insulated switchgear, in particular to a gas insulated switchgear which adopts an air-insulated bushing in power transmission and transformation equipment and is suitable for a power distribution station where a voltage and current transformer for power supply metering is arranged on a gas-insulated bus near the bushing device.

The voltage and current transformer for power supply metering installed in the gas insulated switchgear is generally composed of a combination of a feed-through current transformer and a metering voltage transformer. In recent years, as the power transmission systems between power companies are connected to each other, it has become possible to trade electricity between power companies, but at this time, in the power distribution station directly connected to the power distribution station of other power companies, it is necessary to be close to the bushing Set voltage and current transformers for power supply metering. The general structure of a gas insulated switchgear in such a distribution station recently proposed by the present inventors is shown in FIGS. 7 and 8. FIG.

FIG. 7 is a plan view, and FIG. 8 is a side view taken along line C-C of FIG. 7 . In these two figures, 1 is the piled steel structure corresponding to the overhead power transmission line, 2A~2C, 3A~3C are the air insulating bushings in each phase, and the bushings 2B and 3B in the middle phase are the vertices respectively. , Arranging an isosceles triangle with the bushings 2A, 2C and 3A, 3C of the other two phases as bases. 4A～4C, 5A～5C are feed-through current transformers for each phase, 6A～6C, 7A～7C are measurement voltage transformers for each phase, and these two parts constitute the voltage current transformer for power supply measurement for each phase. 8A to 8C and 9A to 9C are lightning arresters for each phase, and 22 is a measuring voltage transformer used for lines. 10 is the main bus, 12A, 12B is the line unit connected with the main bus 10, 13A, 13B is the three-phase summary bus connected with the main bus 10 through the line units 12A, 12B, respectively extending along the longitudinal direction of the main bus 10. The gas-insulated bus bars 14A-14C, 15A-15C after phase separation are respectively connected to the three-phase collective bus bars 13A, 13B. Extending at right angles to the side away from the main busbar, and on these busbars, starting from the end on the side away from the main busbar (the left end in the figure), the above-mentioned lightning arresters 8A-8C are sequentially arranged in the following order , 9A~9C, bushings 2A~2C, 3A~3C, metering voltage transformers 6A~6C, 7A~7C, and feed-through current transformers 4A~4C, 5A~5C.

In addition, there are known power distribution stations such as substations in which bushings are arranged on a straight line substantially parallel to the longitudinal direction of the main bus bar. The general structure of a conventional gas insulated switchgear of such a distribution station is shown in plan view of FIG. 9 .

In Fig. 9, 10 is the main busbar, 11A and 11B are voltage transformer units, 12A～12F are line units, 16A～16F are single-phase busbar units, 17A～17F are bushing units, 18 is boosting unit, each The bushing units 17A to 17F are composed of gas insulated bus bars 19A to 19C separated for each phase, bushings 20A to 20C for each phase provided on the gas insulated bus bars 19A to 19C, and arresters 21A to 21C.

In the gas insulated switchgear shown in Fig. 7 and Fig. 8, since the gas insulated bus bars 14A ~ 14C, 15A ~ 15C after the phase separation are arranged from the bushings 2A ~ 2C, 3A ~ 3C to the three phases The part on the side of the collective busbar is equipped with a voltage and current transformer for power supply and metering composed of through-type current transformers 4A~4C, 5A~5C and metering voltage transformers 6A~6C, 7A~7C, so the gas insulated busbars 14A~ 14C, 15A ~ 15C must have busbars for setting these devices. In particular, as shown in FIG. 7, when the bushings are arranged in an isosceles triangle with the middle phase as the apex, the three-phase busbars are assembled from the bushings 2A, 2C and 3A, 3C located on the bottom side of the isosceles triangle. The length of gas insulated busbars 14A, 14C and 15A, 15C leading out from the side will be lengthened due to the installation of voltage and current transformers for power supply metering, which will increase the floor area of the entire power distribution station, so its economy has become a problem . In addition, in order to carry out regular verification of the voltage and current transformers used for power supply metering, the through-type current transformers and metering voltage transformers must be removed each time, but because the metering voltage transformers are installed on the positive side of the gas insulated bus It is necessary to temporarily move it to the side of the gas insulated busbar, and then lift it up with a crane, so there is a problem that it is troublesome to disassemble it during the test.

In addition, in the gas insulated switchgear shown in Figure 9, since the phases of the bushing are insulated by air, the phase-to-phase distance is greater than the phase-to-phase distance of the line units on the main bus side. Therefore, if the number of units increases, the Measures must be taken to increase the length of the main busbar beyond that necessary for connecting line units, etc. As for the phase-to-phase distance of the bushing, it is difficult to shorten it even in the future because of the air insulation. However, as for the phase-to-phase distance of the line unit on the main bus side, there is a possibility of shortening in the future due to technological innovation. It is expected that the difference between the two will become larger and larger, and therefore, the necessity of taking measures to increase the length of the main busbar beyond the required length as described above will further increase, which will be uneconomical. In addition, in the bushing units 17A, 17B, 17E, and 17F connected to both ends of the main bus bar 10, the gas insulated bus bars 19A to 19C of the respective phases have the single-phase bus bar unit side part in the single-phase bus bar unit side. The extension line extends obliquely with respect to the main busbar, and the arrester-side part thereof extends at right angles with respect to the main busbar, so the two parts are bent to each other, and the bending angle is different in each phase. That is, in the bushing units connected to both ends of the main bus bar 10 , the structures of the respective phases are different from each other, and no consideration is given to standardization thereof.

Therefore, the object of the present invention is to provide a gas insulated switchgear capable of shortening the length of the separate phase bus extending from the side of the three-phase combined bus to the side away from the main bus, thereby reducing the floor area occupied by power distribution.

Another object of the present invention is to provide a gas insulated switchgear capable of improving the disassembly workability of the voltage transformer for power metering when testing the voltage current transformer for metering power supply.

Another object of the present invention is to provide an economical gas insulated switchgear in which a gas-insulated bushing located at an end side can be connected to a main bus without extending the main bus.

Another object of the present invention is to provide a gas insulated switchgear in which the structure of each phase of a bushing unit can be standardized.

In order to solve the above problems, the present invention provides a gas insulated switchgear comprising: a main bus bar, a three-phase combined bus bar connected to the main bus bar through a line unit and extending in the longitudinal direction of the main bus bar, and a three-phase combined bus bar connected to the main bus bar. The phase-splitting busbars of each phase that are connected and extend to the side away from the main busbar at right angles to the three-phase collective busbar, and the gas of each phase provided at the end of the phase-splitting busbar of each phase on the side away from the main busbar Insulating bushings, and a voltage-current transformer for power supply and metering composed of a through-shaped current transformer and a voltage transformer for metering provided on the phase-separated busbars of the above-mentioned phases, the gas insulated switchgear is characterized in that: the above-mentioned power supply Measuring voltage and current transformers At least a part of the measuring voltage transformer is arranged at an end of the phase-separated bus on the main bus side in a state protruding from the three-phase collective bus to the main bus.

According to the present invention, since the bushing unit on the end side is connected to the main bus bar through the three-phase collective bus bar extending longitudinally along the main bus bar, the bushing unit on the end side can be connected without extending the main bus bar. The unit is connected to the main busbar and thus is extremely economical. In addition, since the structure of each phase of the bushing unit is completely the same, it can be standardized.

According to the present invention, since the through-shaped current transformers of the voltage and current transformers for power supply and metering, which are arranged on the phase-splitting busbars extending away from the main busbar at approximately right angles to the three-phase collective busbar, are arranged below the bushing, Therefore, the length of the split-phase bus that extends from the side of the three-phase aggregated bus to the side away from the main bus can be shortened, which is equivalent to the part of the bus that is necessary to install the through-shaped current transformer, thereby reducing the footprint of the entire power distribution station.

In addition, because at least a part of the voltage and current transformers for power supply metering, especially when the bushing is arranged in an isosceles triangle with the middle phase as the vertex, is arranged on the short-length phase-splitting busbar. The voltage transformer for metering is in the state of protruding from the three-phase aggregated busbar to the main busbar side, especially horizontally arranged at the end of the split-phase busbar near the main busbar side, so the three-phase aggregated busbar can be placed sideways The length of the split-phase bus extending away from the main bus is equivalent to the part of the bus that is necessary to install the voltage transformer for metering. In addition, the voltage transformer for metering can be directly removed by a crane or the like during the verification, thus reducing the overall size. At the same time, the footprint of the power distribution station can be reduced, and the disassembly workability of the voltage transformer for measurement can be improved.

In addition, since the through-type current transformer of the voltage and current transformer for power supply metering is arranged under the bushing, and at least a part of the voltage transformer for metering is protruded from the three-phase collective busbar to the main busbar side, especially It is horizontally arranged at the end of the split-phase bus near the main bus, so the length of the split-phase bus extending from the three-phase summary bus to the side away from the main bus can be shortened, which is equivalent to setting a through-shaped current transformer and metering In addition, the voltage transformer for metering can be directly dismantled by a crane or the like during verification, so the floor space of the entire power distribution station can be reduced, and the voltage transformer for metering can be disassembled at the same time. Workability is improved.

In addition, since the three-phase combined bus bar extending in the longitudinal direction of the main bus bar can be used as the bus bar part of the line unit connected to the bushing unit located at the end side of the main bus bar, it is possible to pass through the three-phase bus bar in particular without extending the main bus bar. The phase summing busbars connect the bushing units located on the end side with the main busbars and are thus extremely economical.

Furthermore, since the phase-separated busbars of the respective phases of the bushing unit are made linear, bushings and lightning arresters are provided on the phase-separated busbars, and the structures of the respective phases of the bushing unit are made the same, standardization can be achieved.

Fig. 1 is a plan view showing a gas insulated switchgear according to an embodiment of the present invention.

Fig. 2 is a side view along line A-A of Fig. 1 .

Fig. 3 is a plan view showing a gas insulated switchgear according to another embodiment of the present invention.

Fig. 4 is a plan view showing a gas insulated switchgear according to another embodiment of the present invention.

Fig. 5 is a side view taken along line B-B of Fig. 4 .

Fig. 6 is a plan view showing a gas insulated switchgear according to another embodiment of the present invention.

Fig. 7 is a plan view of a recently proposed gas insulated switchgear.

Fig. 8 is a side view along line C-C of Fig. 7 .

Fig. 9 is a plan view of a conventional gas insulated switchgear.

Hereinafter, various embodiments of the present invention will be described with reference to the drawings.

1 and 2 are a plan view showing a gas insulated switchgear according to an embodiment of the present invention and a side view taken along line A-A of FIG. 1 . In these two figures, 1 is the tension pile steel structure corresponding to the overhead transmission line, which is the tension pile structure shared by the two lines. 2A～2C, 3A～3C are the gas-insulated bushings in each phase, which are respectively arranged in an isosceles triangle with the middle phase bushing 2B as the apex and the side of the main bus 10 as the base (2A, 2C), and The bushing 3B in the middle phase is the apex, the side close to the main bus 10 and the base (3A, 3C) away from the main bus are arranged in an isosceles triangle. 4A～4C, 5A～5C are feed-through current transformers for each phase, 6A～6C, 7A～7C are voltage transformers for measurement of each phase, and these two devices constitute the variable current transformer for power supply measurement of each phase device. 8A to 8C and 9A to 9C are lightning arresters for each phase, and 22 is a measuring voltage transformer used for lines. 10 is the main bus, 12A, 12B are the line units, 13A, 13B are the three-phase combined bus connected to the main bus 10 through the line units 12A, 12B, extending along the longitudinal direction of the main bus 10 respectively. The gas-insulated bus bars 14A-14C, 15A-15C after phase separation are respectively connected to the three-phase collective bus bars 13A, 13B. side extension, and the above-mentioned bushings 2A~2C, 3A~3C, feed-through current transformers 4A~4C, 5A~5C, metering voltage transformers 6A~6C, 7A~7C, And lightning arresters 8A～8C, 9A～9C. Among these devices, the arrangement of other devices is the same as that shown in FIGS. The metering voltage transformers 6A, 6C, 7B are horizontally arranged at the ends of the gas insulated buses 14A, 14C, 15B near the main busbars in a state protruding from the three-phase collective busbars 13A, 13B toward the main busbar side.

Therefore, as in this embodiment, there is no need to set the voltage transformers 6A, 6C, 7B bus part, so the length of the gas insulated bus 14A, 14C, 15B can be shortened correspondingly, so that the floor space of the whole distribution station can be reduced. In addition, since the metering voltage transformers 6A, 6C, and 7B are arranged at the end of the gas-insulated bus near the main bus in a state protruding from the three-phase collective bus, they can be directly removed by a crane or the like during verification, so improve its workability.

Fig. 3 is a plan view of a gas insulated switchgear according to another embodiment of the present invention. The tensioned pile steel structure 1 is an independent tensioned pile structure for each line. The bushings 2A-2C, 3A-3C of each phase are arranged in an isosceles triangle with the middle phase bushings 2B, 3B as apexes and the main bus side (2A, 2C and 3A, 3C) as a base. Therefore, the shorter gas-insulated busbars become 14A, 14C and 15A, 15C, and the metering voltage transformers 6A, 6C, 7A, 7C arranged on these busbars are horizontally extended from the three-phase collective busbar. It is arranged at the end of the gas insulated bus bar near the main bus bar. Other structures are the same as the above-mentioned embodiment. Also in this embodiment, the same effect as that of the above-mentioned embodiment can be obtained.

4 and 5 are a plan view of a gas insulated switchgear showing another embodiment of the present invention and a side view taken along line B-B of FIG. 4 . In this embodiment, the feed-through current transformers 4A to 4C and 5A to 5C of the respective phases are arranged directly under the bushings 2A to 2C and 3A to 3C of the respective phases. Other structures are the same as the above-mentioned embodiment in Fig. 1 and Fig. 2 . Therefore, according to this embodiment, the same effect as that of the embodiment shown in Fig. 1 and Fig. 2 can be obtained, and there is no need for setting a through-shaped current on the gas-insulated bus bars 14A-14C, 15A-15C of each phase. The bus bars of the transformers 4A-4C, 5A-5C can further shorten the length of the gas-insulated bus bars correspondingly, thereby further reducing the floor space of the entire power distribution station.

In addition, in each of the above-mentioned embodiments, the gas insulated bus bars with longer lengths (14B, 15A, 15C in the embodiment of Fig. 1 and Fig. 2 or Fig. 4 and Fig. 5, and 14B, 15C in the embodiment of Fig. 3 15B), since there are enough voltage transformers for setting metering (6B, 7A, 7C in the embodiment of Fig. 1 and Fig. 2 or Fig. 4 and Fig. 5, and 6B, 7C in the embodiment of Fig. 3 7B), so these metering voltage transformers are arranged directly under the gas-insulated busbar, but these metering voltage transformers can also be horizontally arranged on the gas-insulated busbar in the state extending from the three-phase collective busbar The end on the side of the main busbar. If this method is adopted, the disassembly workability of all voltage transformers for metering can be improved.

In addition, in each of the above-mentioned embodiments, the application when the bushings of each phase are arranged in an equilateral triangle has been described, but the present invention is not limited thereto. It is also applicable to cases such as being arranged in a straight line.

Fig. 6 is a plan view showing a gas insulated switchgear according to another embodiment of the present invention. This embodiment corresponds to the conventional gas insulated switchgear shown in FIG. 9 . In this embodiment, instead of the existing single-phase busbar units 16A, 16F, three-phase summary busbars 13A, 13B extending in the longitudinal direction of the main busbar 10 are used as bushing units 17A, 17F at both ends. The bus parts of the line units 12A and 12F connected to the main bus 10, the gas insulated bus bars 19A-19C of the bushing units 17A and 17F connected to the three-phase collective bus bars 13A and 13B after phase separation, and the three-phase collective The bus bars 13A, 13B extend approximately at right angles to the side away from the main bus bar. In addition, the phase-separated gas-insulated bus bars 19A to 19C of the bushing units 17B, 17E located inside one of the two ends respectively form a straight line on the extension line of the single-phase bus bar units 16B, 16E connected thereto. shape extension. That is, the gas insulated bus bars 19A to 19C after phase separation of the bushing units 17A to 17F all extend linearly, and the bushings 20A to 20C and lightning arresters 21A to 21C of each phase are installed on the bus bars to form a bushing. The respective phase structures of the pipe units 17A to 17F are completely the same. In particular, although not shown in the drawings, the measuring voltage transformers used for the lines of the respective phases are arranged directly under the bushings of the respective phases. Other structures are the same as those of the conventional gas insulated switchgear shown in FIG. 9 .

Claims (5)

1. gas-insulated switchgear device, it has: main bus bar, be connected with this main bus bar by line unit, and three-phase summarizing bus along the longitudinal extension of main bus bar, be connected with this three-phase summarizing bus, and with respect to three-phase summarizing bus meet at right angles to the isolated phase bus that deviates from each phase that main bus bar one side extends, be located at the gas insulated bushing of each phase of the end that deviates from main bus bar one side of the isolated phase bus of this each phase, and be located at and use voltage current transformer by breakthrough form current transformer and metering with the power supply metering that voltage transformer constitutes on the isolated phase bus of above-mentioned each phase, this gas-insulated switchgear device is characterised in that: with above-mentioned power supply metering with the metering of voltage current transformer with at least a portion of voltage transformer with the state configuration of stretching out to the main bus bar side the end of leaning on main bus bar one side at above-mentioned isolated phase bus from above-mentioned three-phase summarizing bus.

2. gas-insulated switchgear device according to claim 1 is characterized in that, above-mentioned power supply metering is configured in the below of above-mentioned sleeve pipe with the breakthrough form current transformer of voltage current transformer.

3. gas-insulated switchgear device according to claim 1 and 2, it is characterized in that: with the ferrule configuration of above-mentioned each phase become by with in be the isosceles triangle on summit mutually, and will be located at above-mentioned metering on the short isolated phase bus of length in the isolated phase bus of each phase with voltage transformer with the state configuration of stretching out to the main bus bar side the end of leaning on main bus bar one side at above-mentioned isolated phase bus from above-mentioned three-phase summarizing bus.

4. gas-insulated switchgear device according to claim 1 and 2 is characterized in that: the above-mentioned metering voltage transformer horizontal arrangement that will be configured in the end of leaning on the main bus bar side of above-mentioned isolated phase bus.

5. gas-insulated switchgear device according to claim 3 is characterized in that: the above-mentioned metering voltage transformer horizontal arrangement that will be configured in the end of leaning on the main bus bar side of above-mentioned isolated phase bus.

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