JPH02158027A - Gas disconnector - Google Patents

Abstract

PURPOSE:To improve the durability by installing an optical CT sensor to a shield cylinder so as to surround a movable contact bar, leading optical fibers connected to the CT sensor to the outside through an insulating valve in a lower insulator, and connecting a detector to the terminal of a cable. CONSTITUTION:An optical CT sensor 27 is installed to a shield cylinder 22 so as to surround a movable contact bar 18, and optical fibers 40, 41 connected to the optical CT sensor 27 are led to the outside through a through hole 22b provided on a through hole 22 provided on the upper shield cylinder 22 and connected to another optical fibers 45, 46 through connector adaptors 43a, 43b and optical connectors 44a, 44b supported by a mounting metal fitting 42 fixed to the upper surface of an lower terminal plate 11. The fibers 45, 46 are led to a case 3 through an insulating pipe 47 made of a reinforced synthetic resin in an insulator 5. The fibers 45, 46 are led to the outside as an optical fiber cable 52 through optical airtight connectors 48, 49 containing optical lenses therein, a line current is received 57 by a detector 53 connected to the terminal of the cable 52, subjected to signal processing 58 and output amplification 59, and displayed 60.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a gas disconnector, and more particularly to a current detection device thereof.

[Prior art] Japanese Patent Publication No. 552837 as a conventional current detection device for a disconnector
What is shown in Publication No. 9 has been proposed.

In this device, a current converter is attached to an externally exposed connection conductor that is electrically connected to a movable blade, and an optical fiber is connected to the converter via a connector with an optical lens. A light source with a mode matching device and a light receiver housed in a box with electromagnetic electrostatic shielding are connected to the terminal of an optical fiber cable that passes through the inside of a hollow support insulator that supports the blade and is pulled out from the lower end thereof. was.

[Problem to be solved by the invention [1] However, in the above-mentioned current detection device, the current converter is led out and provided outside the disconnector, so the current converter may deteriorate due to the influence of external weather. It was easy to use, and its durability was dizzying.

An object of the present invention is to provide a gas disconnector that can prevent deterioration of an optical C'r sensor and improve its durability, and also allows easy installation of an optical CT sensor. .

[Means for Solving Section U] In order to achieve the above object, the present invention connects a lower insulator pipe and a lower insulator pipe in series to an operation case fixed to a frame, and connects the lower insulator pipe to the upper end of the lower insulator pipe. Attach the upper terminal board,
A lower terminal plate is interposed in the connecting portion between the lower insulator tubes, an upper contact is attached to the upper terminal plate, a lower contact is attached to the lower terminal plate, and the lower contact is attached to the lower terminal plate. A movable contact rod that corresponds to the upper contact so as to be able to come into contact with and be separated from the upper contact is attached so as to be slidable in the vertical direction, and an operation a that reciprocates the movable contact rod in the vertical direction is provided inside the lower insulator tube and the lateral case of the operating device. In a gas disconnector, a shield cylinder is provided on the lower terminal plate to cover the movable contact rod and to alleviate an electric field. A CT sensor is attached and the optical CT
The optical fiber connected to the sensor is guided into the operating mechanism case through an insulated pipe installed in the lower insulated tube, and is led out from the case as an optical fiber cable via an optical airtight connector. The method is to connect a detector to the end of the cable.

Effect 1 In the present invention, since the optical CT sensor is housed inside the -E insulator tube in an airtight state, deterioration of the optical CT sensor is prevented and its durability is improved.

Furthermore, since the optical CT sensor was attached using a shield tube, the attachment work becomes easy. In addition, the optical fiber that passes through the lower insulator tube to the case is inserted into an insulated pipe for protection, so it is resistant to vibration and is resistant to damage and stable over the long term.

[Example] Hereinafter, an example embodying the present invention will be described based on the drawings.

As shown in Fig. 7, disconnectors 2 to 2 are installed on three frames 1 to 1 that are erected and fixed on the foundation, respectively, and are used to open and close three-phase electrical circuits. It has become. The disconnectors 2 to 2 for these three phases are formed substantially similarly, and are opened and closed simultaneously for the three phases by a common operating mechanism.

Next, the one-phase disconnector 2 will be explained with reference to FIG.

An operating mechanism case 3 having a horizontal cylindrical shape is fixed onto the pedestal 1. An upper insulator tube 4 and a lower insulator tube 5 are erected and fixed in series on the upper surface of this case 3, and the lower insulator tube 5 has a flange fitting 6 fitted and fixed to the outer periphery of its lower end, and is fastened and fixed to the upper surface of the case 3 with bolts. As a result, it is fixed to the case 3. Further, a flange metal fitting 7 is fitted and fixed on the outer circumferential surface of the upper end of the upper iJ tube 4, and an upper terminal plate 8 to which an electric wire is connected is fastened and fixed to the upper surface of the metal fitting 7 with bolts. Furthermore, attachment rings 9 are provided on the outer circumferential surface of the lower end of the lower insulator tube 4 and the outer circumferential surface of the upper end of the lower insulator tube 5, respectively.
A flange fitting 10 is fitted and fixed, a lower terminal plate 11 for connecting electric wires is interposed between both members 9.10, and a mounting ring 9.10 is fitted. The flange fitting 10 and the lower terminal plate 11 are fastened and fixed to each other by bolts 12.

The upper end of a vertically cylindrical conductor 13 is fitted and fixed to the boss portion 8a formed integrally or separately on the lower surface of the upper terminal plate 8, and the upper contact 14 is attached to the lower end of the conductor 13. has been done. Details of this upper contactor 14 are disclosed in Japanese Patent Laid-Open No. 60-262319 by the applicant of the present application.

On the other hand, a passage 11a is opened in the center of the lower terminal plate 11, as shown in FIG. A lower contact 17 is attached to a locking protrusion 15b formed on the outer periphery of the upper end of the lower contact seat 15. A movable contact rod 18 corresponding to the upper contact 14 so as to be movable toward and away from the upper contact 14 is supported on the lower contact 17 so as to be slidable in the vertical direction. The upper end of an insulating rod 19 constituting the operating mechanism K is connected to the lower end of this movable contact rod 18, and the insulating rod 19 is connected to a rotating shaft 20 and a lever 21 within the lower insulating tube 5 and the operation m horizontal case 3. This allows it to move up and down. When the movable contact rod 18 is brought into contact with and separated from the upper contact 14, the electric circuit is turned on and off.

SF6 gas is hermetically sealed inside the case 3 and the insulated tubes 4 and 5 to suppress arcs generated when the electric circuit is cut off.

On the upper surface of the flange portion 15a of the mounting #15 and the lower surface of the lower terminal plate 11, a lower end flange portion 22a of the upper shield strip 22 and a lower end shield strip 22' are provided on the upper surface of the flange portion 15a of the mounting #15 and the lower surface of the lower terminal plate 11. The upper end flange portion 22a° is tightened and fixed by the bolts 16. A support ring 2 is attached to the inner circumference of the upper end of the upper shield cylinder 22.
3 is fitted and fixed, and the lower surface of the support ring 23 has a cylindrical shape filled with an adsorbent 24 for absorbing SF6 decomposed gas generated when the electric circuit is cut off. An adsorbent case 25 made of a non-magnetic material such as stainless steel is fitted to prevent heat generation. Further, an optical CT sensor 27 is connected to the lower surface of the adsorbent case 25 via a packing 26.
A packing 28 and a support plate 29 are joined to the lower surface of 7.
The support plate 29 is connected to the adsorbent case 2 by means of an elongated support bolt 30 and a nut 31 screwed into the support ring 23.
5 and an optical CT sensor 27.

The optical CT sensor 27 needs to detect the current flowing from the upper terminal board 8 to the lower terminal board 11, and it is also necessary to eliminate the influence of external magnetic fields. As shown in FIG. 2, M″a is composed of an iron core 32 surrounding the movable contact rod 18 at a predetermined interval, and an optical sensor section 33 interposed in an intermittent portion of the iron core. The iron core is made of a magnetic material such as permalloy or silicon steel plate, and has a doughnut-like shape, with a gap provided at a part of the circumference, and an optical sensor section 33 is attached thereto.This optical sensor To explain the section 33 with reference to FIG. 4, the storage case 34
A polarizer 35 and an analyzer 36 are housed inside, and a Faraday element 37 is interposed between them. Further, the polarizer 35 and the analyzer 36 include rod lenses 38 and 39.
are joined, and optical fibers 40 and 41 are connected to each of the rod lenses.

The optical fibers 40 and 41 are led out from an insertion hole 22b provided through the upper shield tube 22, and are supported by a mounting bracket 42 fixed to the upper surface of the lower terminal plate 11 with bolts.A connector adapter 43a.

43b and optical connectors 44a, 44b to another optical fiber 45, 46. By doing so, vibration of the optical fiber can be prevented, making it difficult for the optical fiber to break. Furthermore, both optical fibers 45.4
6 is guided into the case 3 through an insulating pipe 47 made of reinforced synthetic resin such as FPR, which is disposed in the lower insulator tube 5 so as to pass through the lower terminal plate 11 and the upper surface of the case 3.

The optical fiber inside the insulated vibrator 47 is also required to have sufficient insulation strength, and ordinary optical fiber cables with reinforcing materials or sheathing cannot be used because they do not have sufficient insulation. It becomes. Both of the optical fibers 45 and 46 are connected to optical fibers 50 and 51 outside the case 3 by optical airtight connectors 48 and 49 that are provided on the wall of the case 3 and have a built-in optical lens.

Since this optical fiber 50.51 is installed outside,
It is an optical fiber cable 52 having a coating.

The optical fiber cable 52 is connected to a detector 53 inside the substation building. Inside this detector 53 is a light emitting element 54 for supplying light to the optical fiber 50.51.
An optical transmitter 55 having a light receiving element 56 is connected to the other optical fiber 51.

Further, a signal processing section 58, an output amplifier 59, and a display device 60 are connected in series to the optical receiver 57.

Next, the mounting paths for the upper and lower ends of the insulating pipe 47 will be explained based on FIG. 4.

A mounting bracket 61 having a small diameter part and a large diameter part is fitted and bonded to the upper end of the insulating pipe 47, and the small diameter part is attached to the lower terminal plate 1.
The mounting bracket 61 is tightened and fixed to the lower terminal plate 11 by a double nut 62 which is penetrated through the terminal plate 1 and screwed onto the outer periphery of the small diameter portion. Note that an optical fiber 45 is provided inside the small diameter portion.
．． A rubber bush 63 for holding 46 is attached.

Instead of this rubber bushing 63, it may be bonded with an adhesive such as silicone rubber, but since the linear expansion coefficients of the insulating pipe and the optical fiber are different, for example, the above.

It is preferable to bond partially, such as at the bottom end.

On the other hand, a mounting bracket 64 is fitted and adhered to the lower end of the insulating pipe 47, and a locking flange 6 is integrally formed at the lower end.
A two-split stopper 65 is locked to 4a, and a disc spring 66 is interposed in the locking flange 65a of the stopper 65. The difference in thermal expansion between the lower porcelain pipe 5 and the insulating pipe 47 is absorbed by the disc spring 66.

Next, the operation of the disconnector current detection device configured as described above will be explained.

Now, when the movable contact rod 18 is in contact with the upper contact 14 and the electric circuit is in the ON state, when light is output from the optical transmitter 55, this light is transmitted to the optical fiber 50, the optical airtight connector 48, the optical fiber 45, and the optical connector adapter 43a. , the optical connector 44a, the optical fiber 40, and the rod lens 38.
The light is then supplied from the polarizer 35 to the Faraday element 37. When a current flows through the movable contact rod 18, the iron core 32 is magnetized, which causes the optical sensor section 33 to become magnetized.
The light passing through the Faraday element 37 is intensity-modulated according to the strength of the current, and the light intensity-modulated by the Faraday element 37 is transmitted from the analyzer 36 to the rod lens 39, the optical fiber t<-41, and the optical connector 44b. , optical connector adapter 43b, optical fiber 46, optical airtight connector 49,
The signal is transmitted to the optical receiver 57 via the optical fiber 51, and further transmitted to the display section 60 via the signal processing section 58 and the output amplifier 59.
The current value of the line will be displayed. Note that the optical fiber may be connected by a fusion type, and in this case, the optical connector 44
a, 44b and optical connector adapters 43a, 43b are no longer necessary.

Note that the present invention can also be embodied as follows.

The insulating pipe 47 is guided to the outside through the bottom surface of the case 3, and an optical fiber cable is connected to this outer end via an optical airtight connector.

The movable contact rod 1 uses only the optical sensor part 33 without using the iron core 32.
8 and detect the current flowing through the movable contact rod 18 in the same manner as described above.

[Effects of the Invention] As detailed above, in the present invention, the optical CT sensor section is housed airtightly inside both the upper and lower insulated tubes, so that the optical CT
The sensor part is less likely to deteriorate, and as a result, there is an effect that durability can be improved.

In addition, since the optical CT sensor part is attached to the inside of the shield using a shield, there is no need to further shield the optical CT part, it can be stored in a narrow space, and the structure is strong against vibrations when opening and closing. , the installation work becomes easier.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of essential parts showing an embodiment embodying the present invention, Fig. 2 is an enlarged sectional view taken along the line A-A in Fig. 1, and Fig. 3 is a central portion showing one phase of the disconnector. Figure 4 is an explanatory diagram showing the entire current detection device, Figure 5 is a front view of the vicinity of the optical connector adapter, Figure 6 is a sectional view of the vicinity of the optical airtight connector, and Figure 7 is a diagram of the entire disconnector. FIG. 2...Disconnector, 3...Operation m horizontal case, 4 (5)
... Upper (lower) insulator tube, 8 (11) ... Upper (lower) terminal plate, 13 ... Conductor, 14 (17) ... Upper (lower) contact, 18 ... Movable contact rod , 19... Insulating rod, 22... Upper shield tube, 27... Light C
T sensor, 32... Iron core, 33... Optical sensor section, 3
5... Polarizer, 36... Analyzer, 37... Faraday element, K... Operating mechanism. Patent applicant Nippon Insulator Co., Ltd.

Claims (1)

[Claims] 1. The upper insulator tube (4) and the lower insulator tube (5) are connected in series to the operation mechanism case (3) fixed to the pedestal (1), and an upper terminal plate is attached to the upper end of the upper insulator tube (4). (8), a lower terminal plate (11) is interposed in the connecting portion of the upper insulator tube (4) and the lower insulator tube (5), and the upper terminal plate (8)
The upper contact (14) is attached to the lower terminal plate (
11) is equipped with a lower contactor (17), and a movable contact rod (18) that corresponds to the upper contactor (14) so as to be able to come into contact with and separate from the upper contactor (14) can be slid in the vertical direction on the lower contactor (17). An operating mechanism (K) for vertically reciprocating the movable contact rod (18) is provided inside the lower insulator tube (5) and the operating mechanism case (3), and the lower terminal plate (11
) is provided with a shield tube (22) for mitigating the electric field so as to cover the movable contact rod (18), and the shield tube (22) is provided with the movable contact rod (18).
), and an optical fiber (40) connected to the optical CT sensor (27).
, 41, 45, 46) through the insulating pipe (47) installed in the lower insulator pipe (5), and then insert the operation mechanism case (
3) and from the case to the optical airtight connector (48
, 49) to the outside as an optical fiber cable (52).
A gas disconnector characterized in that a detector (53) is connected to the terminal of (2).