JP2000333320A - Gas-insulated transforming facility - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide gas-insulated transforming facilities which enables supplying of power directly to a power distribution system from a high-voltage transmission line passing the vicinity of a customer, has high transmission stability, and is superior in profitability. SOLUTION: Gas-insulated transforming facilities connect one end of a bushing 2a to a high-voltage transmission line 1 via an aerial line 1a. The other end of the bushing 2a is connected to the primary side of a small-capacity gas-insulated transformer 4. The secondary terminal 5 of the gas-insulated transformer 4 is connected to a distribution transmission line 6. Supporting the bushing 2a in an erect state above the gas-insulated transformer 4, the space between the bushing 2a and the gas-insulated transformer 4 is gas-divided by an insulating spacer 12. On the top of the bushing 2a, a current transformer 3a which is an optical current transformer is installed. The current transformer 3a is connected to a central control room via an E/O converter 7 and an optical fiber 8.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas insulated substation installed in a closed container filled with an insulating gas and arranged near a high-voltage transmission line for supplying power to a customer.

[0002]

2. Description of the Related Art Conventionally, a gas insulated substation A as shown in FIGS. 17 and 18 has been considered as a power supply system for consumers scattered in mountainous remote areas. The gas-insulated substation A includes a gas bushing 2 a and a small-capacity gas-insulated transformer 4, and is disposed below or near the high-voltage transmission line 1. Then, the high-voltage transmission line 1 and the gas bushing 2 a are directly connected via the overhead line 1 a, and the distribution-side transmission line 6 is connected to the secondary terminal 5 of the gas-insulated transformer 4. For this reason, the gas insulated substation equipment A is configured so that the secondary output can be reduced to the distribution voltage by the gas insulated transformer 4 and the power can be supplied directly to the customers and the distribution system.

[0003] Since such a gas-insulated substation facility A is installed in the above-mentioned place where much demand cannot be expected,
No switches or transformers are provided. Therefore, the following measures are taken against the fault current. That is,
As shown in the single-line diagram of FIG. 18, the current transformers 3b and 3c of the substations B and C at both ends connected to the high-voltage transmission line 1
The fault current of the high-voltage transmission line 1 is detected, and the circuit breakers 9b and 9c are operated to stop the high-voltage transmission line 1 to protect the power distribution system.

Similarly, when an accident occurs in the gas bushing 2a of the gas insulated substation equipment A or the gas insulated transformer 4, the current transformers 3b, 3b installed in the substations B and C are also used.
c, the fault current is detected, and the circuit breakers 9b, 9c are operated to stop the high-voltage transmission line 1, thereby preventing the fault from spreading to the substations B, C.

[0005]

In the conventional gas-insulated substation equipment configured as described above, a power transmission system is configured by directly connecting to a high-voltage transmission line. For this reason, it is not easy to determine the fault point. After the high-voltage transmission line is stopped, the fault point is searched for, and the power transmission is performed again after the recovery from the fault, and it is necessary to stop the high-voltage transmission line for a long time.

[0006] The present invention has been proposed to solve the problems of the prior art as described above.
An object of the present invention is to provide gas-insulated substation equipment that can supply power directly to a distribution system from a high-voltage transmission line passing near a customer and has high transmission stability and is economical.

[0007]

In order to achieve the above object, a gas-insulated substation according to the first aspect of the present invention comprises:
A substation having a gas bushing and a gas-insulated transformer is disposed below or near a high-voltage transmission line, and the high-voltage transmission line and the gas bushing are connected via an overhead line, and the gas-insulating transformer is A current transformer is provided on a primary side, and a power transmission line is connected to a secondary side of the gas-insulated transformer. According to such a configuration, power can be directly supplied to the distribution system by stepping down the voltage from the high-voltage transmission line passing in the vicinity of the customer, so that the laying distance of the distribution transmission line can be shortened. At the same time, the maintenance work of the power transmission line can be reduced. In addition, since the power transmission line to the customer is short, the occurrence of ground faults and short-circuit accidents due to direct lightning and induced lightning can be reduced. Furthermore, by arranging current transformers, it is possible to determine the point of an accident, and based on the result of this judgment, remove the accident by operating circuit breakers at both ends or at multiple substations connected to the high-voltage transmission line. In addition, the spread of the accident can be minimized.

According to a second aspect of the present invention, in the gas insulated substation according to the first aspect, the high-voltage transmission line is connected to a plurality of substations having current transformers, and a ground fault or short circuit accident occurs. Comparing means for comparing the output of the current transformer connected to the gas-insulated transformer with the outputs of the current transformers in the plurality of substations; and Determining means for determining. According to this configuration, for example, when the determination unit determines that the fault point is a high-voltage transmission line, after the removal of the fault, the high-speed reclosing is performed by the circuit breakers at the substations connected to both ends of the high-voltage transmission line. Perform the operation. Further, when the determination unit determines that the fault point is in the gas insulated substation, only the fault is removed. As described above, the fault point can be accurately determined by comparing with the output of each current transformer, so that it is possible to reliably remove the fault and prevent the spread of the fault.

According to a third aspect of the present invention, in the gas insulated substation according to the first or second aspect, the current transformer disposed on a primary side of the gas insulated transformer is an optical current transformer. It is characterized by the following. According to such a configuration, since the optical current transformer is used, accurate measurement can be performed while eliminating insulation measures.

According to a fourth aspect of the present invention, in the gas insulated substation facility according to any one of the first to third aspects, the high-voltage transmission line is connected to a steel tower through an insulator series provided with an arc horn. It is supported, and the insulation strength of the gas insulation transformer is set higher than the flash voltage of the arc horn. According to such a configuration, the gas-insulated transformer is designed to be over-insulated so as to withstand the flash voltage of the arc horn, so that a lightning arrester can be omitted, and cost reduction and compactness can be achieved. it can.

According to a fifth aspect of the present invention, in the gas insulated substation according to any one of the first to fourth aspects, a cutout switch is connected to a secondary side of the gas insulated transformer. It is characterized by. According to such a configuration, when an accident occurs on the high-voltage transmission line side, the cut-out switch connected to the secondary side of the gas-insulated transformer automatically disconnects from the power distribution system, and the power distribution system Since overvoltage protection can be performed, power distribution with high stability can be realized.

According to a sixth aspect of the present invention, a substation having a gas bushing and a gas-insulated transformer is disposed below or near a high-voltage transmission line, and the high-voltage transmission line and the gas bushing are connected to an overhead line. And a lightning arrester is connected to a primary side of the gas insulated transformer, and a power transmission line is connected to a secondary side of the gas insulated transformer. According to such a configuration, the lightning arrestor
Since the overvoltage can be suppressed below the limit voltage, the insulation level of the gas insulating transformer can be reduced, and the reliability can be improved.

According to a seventh aspect of the present invention, in the gas insulated substation facility of the sixth aspect, a discharge gap is provided in series with the lightning arrester. According to such a configuration, by providing a discharge gap in series with the lightning arrester, it is possible to prevent deterioration due to constant power application. Further, even when the lightning arrester cannot function, or even when the lightning arrester is removed, power transmission can be continued.

According to an eighth aspect of the present invention, in the gas insulated substation according to the sixth aspect, the lightning arrestor is disposed inside the gas insulated transformer. According to such a configuration, by providing the lightning arrester inside the gas-insulated transformer, the insulation level of the gas-insulated transformer can be significantly reduced, reliability can be improved, and downsizing and economy can be improved. Becomes

According to a ninth aspect of the present invention, in the gas insulated substation facility according to the sixth aspect, the lightning arrestor is disposed below the gas bushing, and is combined with a disconnector and a grounding device. The gas bushing and the gas insulated transformer are gas-divided. According to this configuration, inspection and inspection of the gas-insulated transformer
By operating the disconnector and the grounding device at the time of repair, the downtime of the high-voltage transmission line can be minimized.

According to a tenth aspect of the present invention, in the gas insulated substation facility according to the sixth aspect, the lightning arrester is arranged in parallel with an internal conductor in the gas bushing, and a disconnector is connected to the internal conductor. The gas bushing, the lightning arrestor, the disconnector, and the gas-insulated transformer are housed in the same gas section. According to such a configuration, since the gas insulated transformer is also classified into the same gas as other devices, the structure is simplified, the gas monitoring can be facilitated, and the cost can be reduced.

The eleventh aspect of the present invention provides the first to tenth aspects.
In the gas insulated substation equipment according to any one of the above, the high-voltage power transmission line is a two-circuit parallel type, and two lower-phase high-voltage power transmission lines are connected to two sets of the gas bushings by overhead wires. The connection between the high-voltage transmission line and the gas bushing is provided so as to be switched to one of two lines. According to such a configuration, even when it is necessary to inspect one line or stop due to an accident in a two-line high-voltage transmission line, the distribution system can be switched to the other line. Power supply can be continued, so that stable power supply can be achieved.

According to a twelfth aspect of the present invention, in the gas insulated substation according to the eleventh aspect, two sets of the gas bushings are provided so as to be switchably connectable to one of the gas insulated transformers. A changeover switch for performing the setting is provided. According to such a configuration,
Even if it is necessary to check one line or stop it due to an accident, switching the changeover switch to the other line enables the power supply to the distribution system to be continued and one Since the gas-insulated transformer is shared, the equipment can be downsized and cost can be saved.

According to a thirteenth aspect of the present invention, in the gas insulated substation equipment according to the twelfth aspect, the changeover switch has a neutral position to which none of the two circuits is connected, and the neutral position is connected to a ground side. It is characterized by having. According to such a configuration, when checking a device such as a gas-insulated transformer, the switch can be set to the neutral position and grounded, so that the check can be performed without stopping the high-voltage transmission line.

[0020]

DESCRIPTION OF THE PREFERRED EMBODIMENTS (1) First Embodiment (Configuration) An embodiment corresponding to the first to third aspects of the present invention will be described below with reference to FIGS. That is, as shown in FIG.
Is connected to one end of the bushing 2a. The bushing 2a is a gas bushing in which an internal conductor is accommodated in a closed container filled with an insulating gas such as SF6 gas. Further, the other end of the bushing 2a is connected to the primary side of the small capacity gas insulating transformer 4. The gas insulating transformer 4 is a transformer in which windings and the like are housed in a closed container filled with an insulating gas such as SF6 gas. The secondary terminal 5 of the gas insulating transformer 4 is connected to a power transmission line 6.

The bushing 2a is supported upright on the upper part of the gas insulating transformer 4, and the bushing 2a and the gas insulating transformer 4 are gas-divided by the insulating spacer 12. A current transformer 3a is installed at the head of the bushing 2a. This current transformer 3a
An optical fiber using the Faraday effect is connected to a bushing 2
This is an optical current transformer in which a groove is cut and embedded in the head flange portion of FIG. The current transformer 3a is connected to a central control room (not shown) via the E / O converter 7 and the optical fiber 8.

Further, as shown in FIG.
Substations B and C are installed at both ends of the substation. The substations B and C include bushings 2b and 2c, circuit breakers 9b and 9c, and current transformers 3b and 3c connected to the high-voltage transmission line 1, respectively.
have. Then, a computer operated by a dedicated circuit or a predetermined program in the central control room is provided with a comparing means for comparing the detection values of the current transformers 3a, 3b, 3c, and an accident point based on the comparison result by the comparing means. And determination means for determining the condition.

(Operation and Effect) The operation and effect of the present embodiment having the above configuration are as follows. That is, when an accident occurs in the power transmission system, the signal of the current transformer 3 a is once converted into light through the E / O converter 7 installed on the high-voltage transmission line 1 side, and transmitted to the central control room by the optical fiber 8. The signal from the current transformer 3a and the current transformers 3b, 3b of the substations B and C connected to both ends of the high-voltage transmission line 1
By comparing with the signal from 3c, the accident point is accurately determined in the central control room.

Here, if it is determined that the fault point is the high-voltage transmission line 1, the main control room controls the circuit breakers 9 of the substations B and C.
Since a command for performing a high-speed reclosing operation is issued to b and 9c after the accident has been eliminated, retransmission can be performed without stopping the high-voltage transmission line 1. If it is determined that the failure point is in the gas insulated substation A, the central control room
By operating the circuit breakers 9b and 9c promptly,
Since the high-voltage transmission line 1 can be stopped, it is possible to reliably prevent the accident from spreading to the substations B and C connected to the high-voltage transmission line 1.

Further, since the power can be supplied directly to the distribution system by stepping down the voltage from the high-voltage transmission line 1 passing near the customer, the laying distance of the distribution transmission line 6 can be shortened. In addition, the maintenance work of the power distribution transmission line 6 can be reduced. Further, since the power transmission line 6 to the customer is short, occurrence of a ground fault or short circuit accident due to direct lightning or induced lightning can be reduced.

(2) Second Embodiment (Configuration) An embodiment corresponding to the invention described in claim 4 is as follows.
This will be described below. That is, the high-voltage transmission line in the present embodiment is supported by a steel tower via an insulator series provided with an arc horn, similarly to a general high-voltage transmission line. In the present embodiment, the insulation strength of the gas insulation transformer is set higher than the flash voltage of the arc horn, and the insulation is designed to be over-insulated to withstand the flash voltage. Other configurations are the same as those in the first embodiment.

(Operation and Effect) The operation and effect of the present embodiment as described above are as follows. In other words, if a direct lightning strike on the tower supporting the high-voltage transmission line raises the ground potential of the tower and a reverse flashover occurs in the arc horns juxtaposed to the insulator series, the high-voltage transmission line will carry the steep It is necessary to protect equipment installed in the immediate vicinity against a sudden increase in voltage.

In order to cope with this, a lightning arrester is usually installed, but in the present embodiment, the gas-insulated transformer is designed to be over-insulated so as to withstand a flashing voltage. Although it becomes larger, it does not require the installation of lightning arresters. Therefore, the price and the size of the entire gas insulated substation can be reduced. Further, the gas-insulated transformer used in such equipment may be of a very small capacity, and it is easy to make it over-insulated compared to a transformer of normal capacity, so there is no design difficulty. .

(3) Third Embodiment (Configuration) An embodiment corresponding to the invention described in claim 5 is as follows:
This will be described below with reference to FIG. That is, the secondary terminal 5 of the gas insulating transformer 4 in the present embodiment is connected to the power distribution transmission line 6 via the cutout switch 10 that automatically shuts off when the current value reaches a predetermined value. ing. Other configurations are the same as those in the first embodiment.

(Effects) According to the present embodiment having the above-described configuration, the same effects as those of the first embodiment can be obtained, and the variation arranged on the head of the bushing 2a can be obtained. When the fault current is detected by the current transformer 3a, the fault current is automatically cut off by the cutout switch 10 connected to the secondary side of the gas-insulated transformer 4,
An accident occurring on the primary side and the secondary side of the gas insulated transformer 4 can be prevented from spreading to both sides. Therefore, overvoltage protection of the distribution system can be reliably performed, and highly stable power distribution can be realized.

(4) Fourth Embodiment (Configuration) An embodiment corresponding to the invention described in claim 6 is
This will be described below with reference to FIG. That is, in the present embodiment, the tank type high performance lightning arrester 11 is connected in parallel with the gas insulating transformer 4. The tank-type lightning arrester 11 is provided below the bushing 2a.
a. Gas insulated transformer 4
Are arranged horizontally beside the lightning arrester 11, and the bushing 2 a and the lightning arrester 11 are gas-separated from the gas insulating transformer 4 by an insulating spacer 12. Other configurations are the same as those in the first embodiment.

(Effects) According to the present embodiment as described above, the overvoltage can be suppressed below the limit voltage by the lightning arrester 11, so that the insulation level of the gas insulating transformer 4 can be reduced, and the reliability can be reduced. And the size of the gas-insulated transformer 4 can be significantly reduced.

(5) Fifth Embodiment (Configuration) An embodiment corresponding to the invention described in claim 7 is
This will be described below with reference to FIG. That is, in the present embodiment, a protection gap (discharge gap) 30 is provided in series with the lightning arrester 11 above the lightning arrester 11, and discharge occurs in the protection gap 30 only when an overvoltage is applied, so that the lightning arrester 11 operates. Is configured. Other configurations are the same as those of the fourth embodiment.

(Operation and Effect) According to the present embodiment as described above, it is possible to prevent the lightning arrester 11 from being deteriorated due to the constant application of power. Further, even if the lightning arrester 11 cannot perform its function or the lightning arrester 11 is detached, the power transmission can be continued, so that stable power distribution is possible.

(6) Sixth Embodiment (Configuration) An embodiment corresponding to the invention described in claim 8 is
This will be described below with reference to FIG. That is, in the present embodiment, the lightning arrester 11 is housed inside the gas-insulated transformer 4, and the bushing 2a is arranged above the lightning arrester 11, so that the bushing 2a is supported upright. Things.

(Effects) According to the present embodiment as described above, the lightning arrester 11 is provided inside the gas-insulated transformer 4, whereby the insulation level of the gas-insulated transformer 4 can be greatly reduced, and the reliability is improved. As a result, the size of the gas-insulated transformer 4 can be reduced and the economic efficiency can be improved.

(7) Seventh Embodiment (Configuration) An embodiment corresponding to the invention described in claim 9 is as follows:
This will be described below with reference to FIG. That is, in the present embodiment, the disconnector contact 13 is provided on one of the internal conductors 22a in the bushing 2a. This disconnector contact 13
Are arranged in a row so as to be supported by the lightning arrester 11. Further, the gas insulating transformer 4 is disposed horizontally beside the lightning arrester 11, and the bushing 2 a and the lightning arrester 11 are gas-separated from the gas insulating transformer 4 by an insulating spacer 12.

The secondary terminal 5 of the gas-insulated transformer 4
Is connected to the power transmission line 6 via the cutout switch 10.
It is connected to the. Furthermore, on the outer surface of the lightning arrester 11,
A drive device 14 for the disconnector contact 13 and a drive device 15 for the grounding device installed on the primary side of the gas-insulated transformer 4 are provided. Other configurations are the same as those in the first embodiment.

(Operation and Effect) The operation and effect of the present embodiment having the above configuration are as follows. That is, after the circuit breakers 9b and 9c in the substations A and B at both ends of the high-voltage transmission line 1 as shown in FIG. 2 are operated to stop the power transmission, the disconnecting switch contact 13 is operated by the driving device 14. At the same time as disconnecting from the high-voltage transmission line 1, disconnection from the power distribution system is performed by the cutout switch 10 connected to the secondary side of the gas-insulated transformer 4. Thereafter, the grounding is operated by operating the grounding device by the driving device 15, so that the gas-insulated transformer 4 can be inspected and repaired.

At this time, the bushing 2a and the disconnector contact 1
3. Since the lightning arrester 11 is gas-separated by the insulating spacer 12, and the disconnecting switch contact 13 has a sufficient dielectric strength, the power transmission of the high-voltage transmission line 1 can be resumed after the operation of the grounding device, and the downtime Can be shortened.

(8) Eighth Embodiment (Configuration) An embodiment corresponding to the tenth aspect of the present invention will be described below with reference to FIG. That is, in the present embodiment, the upper flange 41 of the bushing 2a
One end of the lightning arrester 11 is supported and fixed. One end of the internal conductor 22a is also supported and fixed to the upper flange 41. The lightning arrester 11 and the internal conductor 22a are arranged in parallel in the bushing 2a while maintaining an insulation distance.

The other end of the lightning arrester 11 is connected to the bushing 2.
a is fixed to the lower flange 42 and grounded. The disconnector contact 13 is provided at the other end of the internal conductor 22a. The disconnect switch contact 13 is insulated and supported by the insulator 40 with respect to the lower flange 42 of the bushing 2a, and is connected to the gas insulating transformer 4 housed in the tank 43 below the bushing 2a.

A drive device 14 for the disconnecting switch contact 13 is attached to the tank 43 so that the disconnecting switch contact 13 can be driven by an insulated drive shaft 44.
Similarly, the driving device 15 for the grounding device is also connected to the tank 43.
Mounted on Other configurations are the same as those in the seventh embodiment.

(Effects) According to the present embodiment having the above-described configuration, the same effects as those of the sixth embodiment can be obtained, and the gas insulated transformer 4 is also different from other devices. Since the same gas section is used, the structure can be simplified, gas monitoring can be facilitated, and the cost can be reduced. The lightning arrester 11 and the disconnecting switch contact 13 are connected by a bushing 2.
a, the height of the tank 43 below the bushing 2a can be reduced, and assemblability can be improved.

(9) Ninth Embodiment (Structure) Another embodiment corresponding to the tenth aspect of the present invention will be described below with reference to FIG. That is, in the present embodiment, one end of the lightning arrester 11 is supported and fixed to the upper flange 41 of the bushing 2a. Internal conductor 22a
Is also supported and fixed to the upper flange 41. The lightning arrester 11 and the inner conductor 22a are connected to the bushing 2
Within a, they are arranged in parallel while maintaining an insulation distance.

The other end of the lightning arrester 11 is connected to the bushing 2.
a is fixed to the lower flange 42 and grounded. The disconnector contact 13 is provided at the other end of the internal conductor 22a. This disconnect switch contact 13 is connected to the gas insulating transformer 4 arranged below the bushing 2a. further,
The disconnect switch contact 13 is arranged in a tank 43 containing the gas-insulated transformer 4. Other configurations are the same as those of the above-described eighth embodiment except that the cutout switch 10 is omitted.

(Function and Effect) According to the present embodiment as described above, since the secondary side of the gas insulated transformer 4 is used for power distribution, the current carrying capacity of the internal conductor 22a of the bushing 2a which is the primary side is limited. It can be small and small in diameter. In addition, by providing the disconnecting switch contact 13 in the tank 43, the lightning arrester 1 is provided.
1 and the inner surface of the bushing 2a can be reduced, so that the bushing 2a itself can be made thinner,
It can be miniaturized and can be manufactured at low cost.

(10) Tenth Embodiment (Configuration) An embodiment corresponding to the invention described in claim 11 will be described below with reference to FIG. 10 and FIG. That is, in the present embodiment, a two-circuit high-voltage transmission line 2
Bushings 2a and 2d of two gas insulated substation devices are provided in each of 0 and 21 so as to be connectable via an overhead line 1a. The two gas insulated substations are respectively installed below or near the high voltage transmission lines 20 and 21, and the gas insulated transformers 4 a and 4 b are connected to the distribution line 6.
a, 6b.

(Effects) According to the above-described embodiment, the overhead line 1 is normally connected to one of the high-voltage transmission lines 20.
The voltage is reduced to the distribution voltage by the gas-insulated transformer 4a connected via the power transmission line a, and power is supplied to nearby customers by the distribution power transmission line 6a. At that time, the bushing 2d,
The gas-insulated transformer 4b is disconnected from the high-voltage transmission line 21 and is in a stopped state.

When the high-voltage power transmission line 20 is stopped for inspection or the like, the high-voltage power transmission line 21 and the bushing 2d are connected in advance by the overhead wire 1a, and the high-voltage power transmission line 20 is connected via the gas-insulated transformer 4b. Power transmission by the transmission line 6b is started. After that, the high-voltage transmission line 20 is stopped, and the inspection work is performed. For this reason, the inspection work of the high-voltage transmission line 20 can be performed without hindering the supply to the power distribution system, and stable power supply can be performed.

(11) Eleventh Embodiment (Configuration) An embodiment corresponding to the twelfth aspect of the present invention will be described below with reference to FIGS. That is, in the present embodiment, the bushings 2a and 2d are connected to the lowest phase of each line of the two-line high-voltage transmission line via the overhead line 1a. The lower ends of these bushings 2a, 2d are connected to tanks 5 arranged horizontally.
It is connected to 0 and stands up in an inverted C shape. The approximate center of the tank 50 is branched in a right-angled horizontal direction and connected to the gas-insulated transformer 4. A power transmission line 6 is connected to the secondary terminal 5 of the gas insulated transformer 4.

Then, inside the tank 50, the contact 60 connected to the internal conductor of the bushing 2a, the bushing 2
d, contact 61 connected to the inner conductor, gas-insulated transformer 4
Are connected. The energizable blade 63 having the contact 62 as a rotation axis is connected to the contact 6.
It is configured as a changeover switch for switching the connection between 0 and the contact 61.

(Effects) According to the present embodiment as described above, normally, the plate 63 is connected to the contact 60 and the distribution voltage is supplied via the gas-insulated transformer 4 connected to the high-voltage transmission line. And supply power to nearby customers via the distribution transmission line 6. When one of the high-voltage transmission lines is stopped for inspection or the like, the blade 63
Is rotated and connected to the contact 61, thereby connecting the other high-voltage power transmission line and the bushing 2d, and starting power transmission by the power transmission line 6 via the gas insulating transformer 4.

As described above, by using the blade 63, the switching can be easily performed, and the influence on the distribution system can be minimized when the high-voltage transmission line is inspected. Further, since one gas-insulated transformer 4 can be shared by two lines, downsizing of the equipment and cost saving can be realized as compared with the case where the gas-insulated transformers 4 are individually provided.

(12) Twelfth Embodiment An embodiment corresponding to the invention described in claim 13 will be described with reference to FIG.
This will be described below with reference to FIG. That is, the present embodiment is different from the tenth embodiment in that a contact 64 grounded inside the tank 50 is provided as a contact of the blade 63 at a neutral position not connected to the contact 60 and the contact 61. .

According to the present embodiment having the above configuration, the gas insulated transformer 4 and the cutout switch 10
In the case of inspection, etc., the blade 63 is rotated and grounded by the contact point 64, so that the inspection can be easily performed without stopping the high-voltage transmission line connected to the bushing 2a or 2d. Can be.

(13) Other Embodiments The present invention is not limited to the above embodiments. For example, in the above-described first embodiment, the current transformer 3a is installed at the head of the bushing 2a. However, as shown in FIG. The same operation and effect can be obtained even when it is arranged on the primary side (high pressure side). Further, as the current transformer 3a, a wound current transformer using electromagnetic induction may be used.

[0058]

As described above, according to the present invention,
Electric power can be directly supplied to the distribution system from the high-voltage transmission line passing near the customer, and the gas-insulated substation equipment with high transmission stability and excellent economic efficiency can be provided.

[Brief description of the drawings]

FIG. 1 is a side sectional view showing a first embodiment of a gas insulated substation equipment of the present invention.

FIG. 2 is a single-line diagram of the embodiment of FIG. 1;

FIG. 3 is a single-line diagram showing a third embodiment of the gas-insulated substation equipment of the present invention.

FIG. 4 is a side sectional view showing a fourth embodiment of the gas insulated substation equipment of the present invention.

FIG. 5 is a side sectional view showing a fifth embodiment of the gas insulated substation equipment of the present invention.

FIG. 6 is a side sectional view showing a sixth embodiment of the gas insulated substation equipment of the present invention.

FIG. 7 is a side sectional view showing a seventh embodiment of the gas insulated substation equipment of the present invention.

FIG. 8 is a side sectional view showing an eighth embodiment of the gas insulated substation equipment of the present invention.

FIG. 9 is a side sectional view showing a ninth embodiment of the gas insulated substation equipment of the present invention.

FIG. 10 is a plan view showing a tenth embodiment of the gas insulated substation equipment of the present invention.

FIG. 11 is a side view of the embodiment of FIG.

FIG. 12 is a front view showing an eleventh embodiment of the gas insulated substation equipment of the present invention.

FIG. 13 is a side view of the embodiment in FIG.

FIG. 14 is a plan view of the embodiment in FIG.

FIG. 15 is a plan view showing an eleventh embodiment of the gas-insulated substation equipment of the present invention.

FIG. 16 is a side sectional view showing another embodiment of the present invention.

FIG. 17 is a side view showing an example of a conventional gas-insulated substation facility.

18 is a single-line diagram of the prior art of FIG. 17;

[Explanation of symbols]

 1, 20, 21 high-voltage transmission lines 2a, 2b, 2c, 2d bushings 3a, 3b, 3c current transformers 4, 4a, 4b, gas-insulated transformers 5 secondary terminals 6, 6a, 6b Power transmission line 7 E / O converter 8 Optical fiber 9b, 9c Circuit breaker 10 Cutout switch 11 Lightning arrester 13 Disconnector contact 14, 15 Drive unit 30 Protection gap 40 Insulator 41 Upper part Flange 42 ... Lower flange 43, 50 ... Tank 44 ... Drive shaft 60, 61, 62, 64 ... Contact 63 ... Blade

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Katsumi Suzuki, Inventor 2-1 Ukishima-cho, Kawasaki-ku, Kawasaki-shi, Kanagawa Prefecture Inside the Toshiba Hamakawasaki Plant (72) Inventor Kozo Matsushita No. 2, Ukishima-cho, Kawasaki-ku, Kawasaki-shi, Kanagawa Prefecture No. 1 Inside Toshiba Hamakawasaki Plant (72) Inventor Ikuo Miwa 2-1 Ukishimacho, Kawasaki-ku, Kawasaki-shi, Kanagawa

Claims (13)

[Claims] 1. A substation device having a gas bushing and a gas insulated transformer is disposed below or near a high-voltage transmission line, and the high-voltage transmission line and the gas bushing are connected via an overhead line. A gas-insulated substation facility, wherein a current transformer is provided on a primary side of a gas-insulated transformer, and a power transmission line is connected to a secondary side of the gas-insulated transformer. 2. The high-voltage transmission line is connected to a plurality of substations each having a current transformer, and when a ground fault or short circuit accident occurs, an output of the current transformer connected to the gas-insulated transformer is output. And a comparing means for comparing outputs of the current transformers in the plurality of substations; and a judging means for judging an accident point based on a comparison result by the comparing means. The described gas insulated substation equipment. 3. The current transformer disposed on the primary side of the gas-insulated transformer is an optical current transformer.
Or the gas insulated substation equipment according to claim 2. 4. The high-voltage transmission line is supported by a steel tower via an insulator series provided with an arc horn, and an insulation strength of the gas-insulated transformer is set higher than a flash voltage of the arc horn. It is characterized by having.
The gas insulated substation equipment according to claim 1. 5. The gas insulated substation according to claim 1, wherein a cutout switch is connected to a secondary side of the gas insulated transformer. 6. A substation device having a gas bushing and a gas insulated transformer is disposed below or near a high-voltage transmission line, wherein the high-voltage transmission line and the gas bushing are connected via an overhead line, A gas-insulated substation facility, wherein a lightning arrester is connected to a primary side of a gas-insulated transformer, and a power transmission line is connected to a secondary side of the gas-insulated transformer. 7. The gas-insulated substation according to claim 6, wherein a discharge gap is provided in series with the lightning arrester. 8. The gas-insulated substation according to claim 6, wherein the lightning arrester is disposed inside the gas-insulated transformer. 9. The lightning arrester is disposed below the gas bushing and is combined with a disconnector and a grounding device, and the lightning arrester and the gas bushing and the gas insulating transformer are gas-separated. 7. The method according to claim 6, wherein
The described gas insulated substation equipment. 10. The lightning arrester is arranged in parallel with an internal conductor in the gas bushing, a disconnector is connected to the internal conductor, the gas bushing, the lightning arrestor, the disconnector, and the gas insulating transformer are: 7. The gas insulated substation according to claim 6, wherein the gas insulated substation is housed in the same gas section. 11. The high-voltage power transmission line is a two-circuit parallel type, and two lowest-phase high-voltage power transmission lines are provided so as to be connectable to two sets of the gas bushings via overhead wires, respectively. The gas-insulated substation equipment according to any one of claims 1 to 10, wherein a connection between the high-voltage transmission line and the gas bushing is provided so as to be switched to one of two lines. 12. The gas bushing according to claim 11, wherein said two sets of said gas bushings are provided so as to be switchable and connectable to one said gas insulated transformer, and a changeover switch for performing said changeover is provided. Gas insulated substation equipment. 13. The gas-insulated substation equipment according to claim 12, wherein the changeover switch has a neutral position where none of the two lines are connected, and the neutral position is connected to a ground side.