JPS60200710A - Gas insulated switching device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a gas insulated switchgear installed in an electrical station such as a substation.

PRIOR ART Recently, gas insulated switchgear installed in substations, etc., has a structure in which multiple devices constituting the switchgear are housed in a metal container filled with relatively low pressure insulating gas. Attention has been paid. According to this structure, the structure is much simpler than that of a gas-insulated switchgear in which each device is housed in a separate metal container and the containers are connected via an insulating spacer. In addition, the device can be made smaller (to save installation space).Furthermore, the appearance can be simplified, so it can harmonize with the surrounding environment.

This type of device that has already been proposed includes a main unit that stores a circuit breaker, a grounding device, a 4-way transformer, etc. in a main container, a bus-side disconnect switch, and a 1U line-side disconnect switch. A busbar unit configured by housing a busbar conductor connected to the circuit breaker in a container, a cable head connected to the circuit breaker, and a lightning arrester connected to the cable head in a container. There are those that consist of a cable head unit 1 to 1 that is housed in a cable head unit, and those that have a couple head and lightning arrester housed in the main container without providing a cable head unit. By the way, among the above equipment, lightning arresters and quadruple transformers are not always installed, and depending on the configuration of the electrical station, these may be omitted, and if these are omitted, the It is desirable to downsize the device. However, in the gas-insulated switchgear proposed above, even if the lightning arrester and N1 transformer are removed, the space allocated to the surge arrester and the 4-power transformer will not be lost, so one part must be made common for various specifications. If the containers for each unit 1 are standardized in order to make it possible to carry out water tank installation h1, there will be a lot of dead space in the main unit 1 container or in the cable head unit container. The disadvantage is that there is a lot of wasted insulating gas (1) fil.

OBJECTS OF THE INVENTION An object of the present invention is to standardize the containers of each unit so that it is possible to conduct a
If the I transformer and disconnection transformer are omitted, the
) An object of the present invention is to provide a sea urchin IC gas insulated switchgear that can be made smaller.

414th aspect of the invention The present invention provides a gas-insulated switchgear in which a main unit is configured by housing switchgear in a main container filled with an insulating gas, in which an N1 transformer and a three-phase lightning arrester are filled with an insulating gas. The present invention is characterized in that the auxiliary vessel of the lightning arrester transformer unit I is housed in an auxiliary vessel to form an independent lightning arrester transformer unit, and the auxiliary vessel of the lightning arrester transformer unit I is connected to the main vessel via an insulating space. The insulating spacer is provided with triangularly arranged embedded conductors, and the non-ground terminal of the lightning arrester is connected to equipment in the main container via the embedded conductors.

Further, the primary terminal of the instrument transformer is connected to a non-ground terminal of a lightning arrester of a phase to which the transformer is to be connected.

The main equipment to be placed inside the container is a plurality of switching equipment necessary for configuring a closed circuit at an electrical station, such as a circuit breaker and other equipment connected to the circuit breaker (grounding device for circuit breaker inspection, disconnectors, current transformers, etc.). In some cases, the circuit breaker is installed separately from the main unit, and switching devices other than the circuit breaker, such as a disconnector and a grounding device, are housed in the main container to form a main unit. Furthermore, (7) A current transformer, a couple head, etc. are housed in the main unit 1 along with the switching equipment.

The above-mentioned circuit breaker may be a power circuit breaker in which a movable contact and a fixed contact are housed in a dedicated container together with an appropriate disconnection mechanism. A buffer type gas circuit breaker extinguishes the arc by spraying SF6 gas from a buffer cylinder with a smaller volume, and an arc rotation type that extinguishes the arc by rotating the arc at high speed in SF6 gas using the lk magnetic field generated by the arc current. A gas circuit breaker can be used.

A commonly used lightning arrester having a structure in which an element is housed in an elongated cylindrical container can be used.

The instrument transformer is a single-phase one (in this case, its primary 0fi
The L terminal is connected to the non-ground terminal of the lightning arrester of any one phase. ) (・MoJ: ri, it may also be used for 3 phases.

Example The present invention will be described in detail below with reference to the accompanying drawings.

Figures 1 to 4 show an embodiment in which the present invention is applied to a double bus bar configuration, and Figure 1 shows the electrical configuration of each phase in a single line diagram. FIG. 2 is a cross-sectional view of the container of the lightning arrester transformer unit 1- used in the same embodiment, looking inside from the back side. 2 is a cross-sectional view taken along the line ■--■ in FIG. 2, and FIG. 4 is a cross-sectional view showing the lightning arrester transformer of the same embodiment with the bushing for applying a test voltage removed (=H).

In FIG. 1, BS1 and BS2 are the first and second busbars, respectively, C [3 is a circuit breaker, and one end of the circuit breaker CB is connected to the first busbar through the first and second busside disconnectors DS11 and DS12. and second til wires BS1 and BS2, respectively. A grounding device for circuit breaker inspection [ES1 and ES2] is installed between one end of the circuit breaker CB and the ground, and between the other end and the ground, and a A grounding device ES3 for the line side disconnector is installed at -C.A current transformer CT is installed on the conductor part connecting the line side disconnector DS2 and the cable pend CH, and the line side terminal of the line side disconnector DS2 is installed at the line side disconnector DS2. A lightning arrester LA is connected between the surge arrester 1- and the ground, and the primary terminal of the n1 transformer P'F is connected to the non-ground terminal of the lightning arrester 1-.

In this embodiment, the circuit breaker CB, the disconnector DS2, the grounding devices FSl to ES3, the current transformer CT, and the cable head C1-
1 are housed in the main container 1 to constitute the main units 1 to △1, and the bus bar [3S1 and the disconnector DS11 are housed in the common container 2.
(The first busbar unit A2, the busbar 13S2 and the disconnector DS12 are housed in the common container 3 to form the second busbar).
There is. Further, the lightning arrester LA is housed in a common auxiliary container 4 together with the quadruple transformer L1) to constitute a one-unit lightning arrester transformer A4. The main container 1 is formed, for example, in a cylindrical shape and is arranged with its axis facing the vertical direction, and the DJ line 2 [Leeks 1 to A2 and A3 are device connections provided with the respective containers 2 and 3 on the side of the main container 1. It is connected to the main unit A1 by making a -C connection at the frontage through insulating spacers 5 and 6. Also lightning protection '9A'
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It is connected to the main container 1 through the main unit A1. Containers 1 to 4 are filled with SF6 gas at a predetermined pressure.

Of the above configurations, the present invention particularly provides a surge arrester transformer unit A.
It is characterized by having 4. The structure of the lightning arrester transformer units 1 to 1 in this embodiment is as shown in FIGS. and a second tubular part 402 that branches off from the first tubular part at right angles in the -F direction, and one end of the first tubular part 401 is installed on the side surface of the main container 1 via an insulating spacer 7. It is airtightly connected to the device connection opening 101 by a flange connection. Also the first
The other end of the tubular part 401 is hermetically closed by a cover plate 403, and the lower end of the second tubular part 40'2 is hermetically closed by a bottom plate 404. This example, bottom plate 4.04
is abutted on the installation base 8 that supports the main container 1, so that the container 4 is supported with respect to the installation base 8.

The three-phase conductor 70 is passed through the insulating spacer 7 airtight.
1 is set up. These three-phase embedded conductors are arranged triangularly, and the end of each embedded conductor 701 located inside the container 4 is fixed with a dulip contact 1~ arranged in the shield. Electrode 10 is connected.

Three-phase lightning arresters LA have elements housed in a cylindrical container 11, and these three-phase lightning arresters LA are arranged in a triangular manner with their central axes parallel to the central axes of the embedded conductors 701 in the insulating bases 1 and 7. has been done.

In this embodiment, the central axis of the lightning arrester LA for each phase is located eccentrically with respect to the extension of the central axis of the embedded conductor 701 for each phase, and the non-grounding side terminal of each arrester 12
An electrode portion 13 that can be aligned with the fixed contact 10 is provided. A movable contact 14 is provided to slidably penetrate the electrode portion 13 of each lightning arrester LA, and each movable contact 14
is connected to the insulated operating rod 15 provided by penetrating the cover plate 403 airtightly and movably. An operation handle 16 is provided on one part of each insulated operation rod 15,
By holding the handle and linearly displacing the insulated operating rod 15, each movable contact 14 can be moved toward and away from the corresponding fixed contact 10.

J1 dexterity transformer m1) T is the second tubular part 4 of the auxiliary container 4
02 and supported by the bottom plate 404. In this embodiment, a single-phase transformer is used as the instrument transformer. From the upper end of the mouthpart transformer L'P-cho to the main container 1
A primary terminal 20 is provided so as to protrude from the side, and a fixed electrode 21 consisting of a du-lip contact i~ disposed in a shield is provided on the primary terminal, and a fixed electrode 21 is attached to the primary terminal with its axis directed horizontally. It is attached to the plate 403 side with the opening thereof facing.

And the lowest lightning arrester L to which this instrument transformer is connected
The non-grounding side terminal 12 of A is a transformer connecting terminal electrode 22 having a substantially inverted 1-shape with its tip bent toward the fixed electrode 21 side.
is provided. The terminal electrode 22 is connected to the fixed electrode 21 by 1
B2 is formed so that it can freely engage with the terminal electrode 22 so that it is automatically connected to the fixed electrode 21 when the lightning arrester 1-A supported by the cover plate 403 is inserted into the container 4. 22 and fixed electrodes 21 are set.

If the non-ground terminal 12 of the lightning arrester 11 is configured to be automatically connected to the terminal of the instrument transformer LPT from the horizontal direction as described above, the connection between the lightning arrester LA and the instrument transformer will be Connection and disconnection can be easily performed.

In the above embodiment, the fixed contact 10 and the J-opening contact 14 constitute a lightning arrester disconnecting section that is installed in parallel with the lightning arrester and can be operated from the outside of the auxiliary container, and the fixed contact that constitutes the disconnecting section The contactor 10 and the movable contactor 14 are arranged on an extension of the central axis of the embedded conductor 701 of the insulating suberly 7. In addition, in this embodiment, the lightning arrester disconnecting section connects the heavy equipment transformer LP king to the main unit A1.
! Sleeping.

With the above configuration, with the auxiliary container 4 sealed, by pushing the insulated operating rod 15 from the outside of the container 4, the movable contact 14 is brought into contact with the fixed contact 10, and each lightning arrester LA is and separate transformer L1] - "Main unit 1~A
1 predetermined equipment (in the illustrated example, cable head CI-
1). In addition, when it is necessary to disconnect the lightning arrester and instrument transformer from the main unit 1-, such as during a voltage withstand test of a circuit breaker, each lightning arrester and instrument transformer can be connected by pulling out each insulation operation rod 15. can be easily removed from the main unit.

When pulling out the insulated operating rod 15 to hold the lightning arrester section in an open state, be sure to attach the operating rod to the cover plate 403 as shown in FIG. It is preferable that the operating handle 16 of the insulated operating rod be fixed to the fixing plate by removing the fixing plate 30.

In the above embodiment, when performing a pressure test of the cable head Cl-1, as shown in FIG.
The cover plate 403 is replaced with a cover plate 403- from which the test voltage application bushing 31 has been removed, and the contact 32 connected to the bushing 31 is brought into contact with the three-phase fixed contact 10. In this case as well, the contact 32 is automatically brought into contact with the fixed contact 10 at the same time as the cover plate 403' is removed. In this case, it is necessary to remove the surge arrester and the transformer for the 1-stage surge arrester from the main unit to vent the gas, but in the present invention, the surge arrester and the transformer for the surge arrester must be removed from the main unit 1- by covering the cover plate 403. C can be removed from the main unit A.
There is no need to vent the gas in the first container 1, but it is only necessary to vent the gas in the auxiliary container 4, so gas treatment can be easily performed.

As in the above embodiment, the lightning arrester is provided eccentrically with respect to the embedded conductor of the insulating spacer', and the disconnecting section for the lightning arrester is placed on the Ill1b wire of the embedded conductor 701 of the insulating spacer'7. The disconnecting section can be configured with parts, and the structure can be easily modified.1. Also, as in the above embodiment, the disconnecting section for the air escaper 7J rice 1 transformer and the main unit,
Constructed to also serve as a disconnect between the knit and the 41
You can easily convert 4-zo to 111.

In the above explanation, a gas insulated switchgear with a double bus bar configuration was taken as an example, but a gas insulated switchgear with a single bus bar configuration has bIIi.
The invention can be applied in many different ways.

- In Example C described in 1, the circuit breaker is housed in the main container 1, but the main container 1 is equipped with an open device other than the circuit breaker (if necessary, a current transformer, etc.) Of course, the present invention can also be applied to the case where the circuit breaker is installed separately from the main unit 1.

Effects of the Invention As described above, according to the present invention, an i1 voltage transformer and a three-phase surge arrester are housed in an auxiliary container to constitute one independent surge arrester transformer unit, and the unit is connected to the main unit. I installed a lightning arrester and H1 inside the main units 1 to 1.
There is no need to keep a space (11f) for the power transformer.Therefore, it is possible to standardize the container, and also to accommodate the lightning arrester and
It is possible to prevent wasted space from being created inside the main container when the single-use transformer is omitted. In addition, since only the gas in the auxiliary container needs to be treated during a pressure test of the cable head, the work can be simplified.

[Brief explanation of drawings]

Figures 1 to 4 show an embodiment in which the present invention is applied to a double busbar 1 (four-component switchgear), and Figure 1 is a single line diagram showing the electrical configuration of each phase. Figure 2 is a block diagram schematically showing the arrangement of the lightning arrester transformer unit 1 used in the same embodiment, and Figure 2 is a cross-sectional view of the container of the lightning arrester transformer unit 1 used in the same embodiment, looking inside from the back side. Figure 3 is a cross-sectional view taken along the line ■-■ in Figure 2 to show the inside, and Figure 4 shows the state in which the shinging for applying a test voltage is removed from the lightning arrester transformer unit of the same embodiment. 1... Main container, 4... Auxiliary container, 401... First
Tubular part, 402... Second tubular part, 403... Lid plate, 404... Bottom plate, 7... Insulating spacer, 701
... Embedded conductor, 10... Fixed contact, 11... Container of lightning arrester, 12... Non-grounding side terminal of lightning arrester, 13...
... Electrode, 14... Movable contact, 15... Insulated operating rod, 20... Fixed electrode, 22... Terminal electrode for connecting transformer, C [3... Circuit breaker, D311, DS12・・・
・Bus bar side disconnector, DS2...Line side disconnector, C1-1
...Cable head, ESI-ES3...Grounding device, CT...Current transformer, LPT...1.1 transformer, GIS...Gas insulated switchgear. Stem/M Thatch 2n 4f Thatch 3 Sub-thatched 4M

Claims (6)

[Claims] (1) In a gas-insulated switchgear configured by housing a plurality of switchgear devices in a main container filled with insulating gas to form a main unit, the gas-insulated switchgear is connected to the main container via an insulating spacer and An instrument transformer and a three-phase lightning arrester are housed in an auxiliary container filled with insulating gas to form a lightning arrester transformer unit, and the non-grounding side terminal of the three-phase lightning arrester is connected to the insulating spacer in an airtight manner. Penetrating and triangularly arranged.
The primary terminal of the instrument transformer is connected to the non-ground terminal of the lightning arrester of the phase to which the transformer is connected. A gas-insulated IT] device characterized by: (2) The three-phase lightning arrester is arranged in a triangular manner parallel to the buried conductor at a position eccentric to the extension of the central axis of the through conductor in the insulating space υ, and the non-grounded side of the lightning arrester The terminal is connected to the embedded conductor through a lightning arrester disconnecting section configured by a synchronized contact that can be operated from the outside of the auxiliary container and a fixed contact provided on the embedded conductor. A gas insulated switchgear according to claim 1, characterized in that: (3) The fixed contact child movable contact constituting the lightning arrester disconnecting section is arranged on an extension of the central axis of the embedded conductor, as set forth in claim 2. gas insulated switchgear. (4) The gas according to claim 2 or 3, wherein the primary terminal of the instrument transformer is connected to the embedded conductor via the lightning arrester disconnecting section. Insulated switchgear. (5) The auxiliary container has a working opening at a position relative to the insulating spacer. A movable contactor is supported on the non-grounded side terminal of the H1 transformer connected to the IT transformer, and the non-ground terminal of the H1 transformer can be freely engaged and detached from the frontage side of the auxiliary container. Claim 2, further comprising a transformer connecting terminal electrode that is engaged with and connected to the primary terminal.
The gas insulated switchgear according to item 1 or 3. (6) The auxiliary container includes a first tubular part extending in the horizontal direction, and a second tubular part extending branchingly in the r direction from the first tubular part.
a tubular section, wherein the lightning arrester is disposed horizontally within the first tubular section, and the δl transformer is disposed within the second tubular section. The gas insulated switchgear according to any one of items 5 to 6.