CN207021580U - One kind is without bin static contact non-SF 6 gas insulative switchgear - Google Patents

One kind is without bin static contact non-SF 6 gas insulative switchgear Download PDF

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Publication number
CN207021580U
CN207021580U CN201720432037.0U CN201720432037U CN207021580U CN 207021580 U CN207021580 U CN 207021580U CN 201720432037 U CN201720432037 U CN 201720432037U CN 207021580 U CN207021580 U CN 207021580U
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gas
breaker
switchgear
gas tank
static contact
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CN201720432037.0U
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Inventor
尚雨
范永龙
黄强
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Jiangsu Daqo Changjiang Electric Co Ltd
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Jiangsu Daqo Changjiang Electric Co Ltd
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Abstract

The utility model discloses one kind without bin static contact non-SF 6 gas insulative switchgear, belong to medium voltage switchgear equipment field.It is poor for non-SF6 gas switchgears arc quenching effect present in prior art, insulating properties is not strong, the problem of security is weak, the invention provides one kind without bin static contact non-SF 6 gas insulative switchgear, including air chamber, mechanism chamber, control room, cable vault and pressure releasing chamber, mother device room, air chamber includes the mother device being sequentially connected, three-station, breaker, bus, outlet casing tube and gas tank, three-station, breaker, bus is arranged in closed gas tank, mother device, outlet casing tube is arranged on gas tank housing, non- SF6 insulating gas is filled with gas tank, described breaker is solid-sealing vacuum arc extinguishing breaker.The switchgear of this programme is non-maintaining, and effectively prevents destruction of the severe environmental conditions to insulating properties, and guarantee switchgear is normal, safe operation.

Description

One kind is without bin static contact non-SF 6 gas insulative switchgear
Technical field
Medium voltage switchgear equipment field is the utility model is related to, more specifically to one kind without the non-SF6 gas of bin static contact Body insulated switching installation.
Background technology
Existing medium voltage switchgear equipment mainly uses air insulation or SF6 gas-insulateds, air insulated switch equipment due to Its dielectric is air, is easily influenceed (such as salt, humidity, pernicious gas, High aititude, dust by switchgear surrounding environment Deng), cause insulation breakdown, switchgear that accident occurs.
In order to exclude the influence of environment switching devices, there are a kind of SF6 gas-insulated switchgears (such as C-GIS), By high-voltage live parts and switch be arranged on one made of metal, it is closed, can bear in the gas tank of certain pressure, then to gas SF6 insulating gas is filled with case;But SF6 gases can be decomposed into toxic gas by arcing and be fuel factor gas, its thermal effect Should be CO222800 times, the gas of limiting emission is classified as by the Kyoto Protocol.
Also occur the switching system of non-SF6 gases, Chinese patent application, application number in existing design 201510520667.9, publication date on November 18th, 2015, disclose a kind of on-load switch suitable for environmentally friendly gas-insulated type Ring main unit, including ring main unit body, ring main unit body are divided into operating room, on-load switch room, cable vault and discouraged room;On-load switch Interior is provided with three-stations load switch, the rotary shaft being connected with three-stations load switch, directly over three-stations load switch On-load switch connection row, and the contact rod immediately below three-stations load switch;Lose heart between room and on-load switch room Provided with explosion-proof valve;The inlet wire cable pillar being connected with contact rod is provided with cable vault, inlet wire cable pillar passes through contact rod and three Station load switch connects;The operating mechanism for being used for controlling three-stations load switch to rotate is provided with operating room;Operating mechanism leads to When crossing rotary shaft drive three-stations load switch rotation, three-stations load switch is grounded successively, is disconnected and is connected with on-load switch Row's connection.Its advantages of is simple in construction, safety, and switch closing and switch opening is convenient.
Chinese patent application, application number 201520677913.7, publication date on January 6th, 2016, a kind of environmentally friendly gaseous type are filled Gas ring main unit, breaker are fixed on the bottom of inwall on the right side of housing, and static contact is fixed on the top of inwall on the right side of housing, and ground connection is touched Head is fixed on the middle part of housing inner left wall, and the static side at the top of breaker is provided with bearing, and the bottom moved end of breaker passes through insulation Pull bar realizes and is connected with the operating mechanism outside housing that three-station is fixed on the top surface of bearing, dynamic on three-station Contact knife can be contacted with static contact and grounding contact respectively, and breaker is connected by transition conductor with outlet casing tube, and static contact passes through Conductor is connected with bus casing.This utility model overall structure novelty, good reliability, flexible arrangement, floor space are small, height mould Block, the characteristics of production cost is low.
Chinese patent application, application number 201520873137.8, publication date on March 9th, 2016, power switchgear technology Field, particularly a kind of environmentally friendly gas-insulated ring network cabinet.For the sulfur hexafluoride in existing sulfur hexafluoride gas-insulating ring main unit Destruction problem of the gas to environment, the utility model employ environmentally friendly gas such as dry air, nitrogen etc. and opened as insulating materials Environmental-protective gas-insulating ring main unit is sent out.The technical measures that the utility model mainly uses are:Breaker uses vacuum extinction skill Art, disconnecting switch use double break mouth structure, optimize electric-conductor Electric Field Distribution using technology of pressure equalization.Add observation window, humidity shows Show test paper etc., ensure the safety of operation maintenance personnel.The beneficial effect of this utility model is:Without sulfur hexafluoride gas (SF6), ring Protect, safety;A variety of compound inslation technologies are employed, improve the insulating capacity of ring main unit, compensate for environmentally friendly gas-insulated ability Deficiency.
But above-mentioned existing switching system, insulating gas are used not only for insulating, and for the function of arc extinguishing, but disliking Under bad environment, its arc quenching effect is poor, and influences whether insulating properties, to integral insulation switch cubicle poor effect.
The content of the invention
1. technical problems to be solved
For non-SF6 gas switchgears arc quenching effect present in prior art is poor, insulating properties is not strong, security is weak Problem, the utility model provide one kind without bin static contact non-SF 6 gas insulative switchgear.It can realize that switch cubicle is only Vertical arc extinguishing, arc quenching effect is good, insulating properties is strong, security is good.
2. technical scheme
The purpose of this utility model is achieved through the following technical solutions.
It is a kind of without bin static contact non-SF 6 gas insulative switchgear, including air chamber, mechanism chamber, control room, cable vault and Pressure releasing chamber, mother device room, mother device room is arranged above air chamber or sidepiece or enclosed setting, and such a setting is according to mother device Installation requirement, the free degree are high, mother device that air chamber includes being sequentially connected, three-station, breaker, bus, outlet casing tube and Gas tank, three-station, breaker, bus are arranged in closed gas tank, and mother device, outlet casing tube are arranged on gas tank housing On, non-SF6 insulating gas is filled with gas tank, described breaker is solid-sealing vacuum arc extinguishing breaker, and mother device is outside gas tank The outside other switchgears of part connection or inlet wire cable in portion, part and the static contact of three-station inside gas tank connect Connect, static contact is the static contact without bin, is shaped as C-shaped configuration, and end of incoming cables is connected with mother device.
Further, described non-SF6 insulating gas is nitrogen, carbon dioxide, dry air or non-greenhouse effect The forming gas answered.
Further, described mother device is fixed sealing type mother device, mother device be arranged on gas tank top or sidepiece or Top, sidepiece are installed simultaneously.
Further, described three-station is coaxial rotary disconnecting link formula switch, is a kind of three-phase synchronous disconnecting link Rotary three position switch, three-station are connected by sealing flange with the three-position switch operation mechanism outside gas tank, three works Bit switch operating mechanism actuating three-station arrives connection position, isolated bit and ground connection position respectively;After grounding contact three-phase short circuit with Gas tank housing is connected, and moving contact is connected with breaker end of incoming cables.Three-station, static contact are arranged on mother device, and ground connection is touched Head is arranged on a copper bar, copper bar and gas tank housing connect.The original anglec of rotation of three-station is 105 °, this programme Three-station uses the anglec of rotation as 90 ° of three-station, the C-shaped configuration of no bin is arranged to due to static contact, it is necessary to Angle initialization is set only to need to reach 90 °, operating mechanism is being carried out caused by avoiding the irregular angle due to 105 ° Operation switch is not in place or excessive, ensure that switch is stable in switching action, folding efficiency high.
Further, described breaker includes the insulated tension pole on a main shaft connection three-phase breaker, and main shaft leads to Cross sealing flange to be connected with the circuit breaker operation mechanism outside gas tank, circuit breaker operation mechanism actuating three-phase breaker synchronously completes conjunction Lock or separating brake, the synchroswitching and separating brake of three-phase breaker, breaker end of incoming cables and three works are realized by breaker main shaft rotation Moving contact connection, leading-out terminal and the bus of bit switch connect.
Further, described bus is naked copper formula, and the leading-out terminal connection of bus one end and breaker, the other end are with going out Thread casing connects.
Further, described outlet casing tube is fixed sealing type;Part inside gas tank is connected with bus, outside gas tank The part in portion is connected with outlet cable.O-ring is provided with mother device and outlet casing tube, prevents insulating gas from leaking.
Further, described gas tank is welded by stainless steel plate.
Further, the pressure relief device I of anti-internal arcing is installed on described gas tank.
Further, described cable vault is provided with pressure relief device II.
3. beneficial effect
Compared to prior art, the utility model has the advantage of:
(1), the switchgear of this programme is not influenceed on insulation by environment, is safe and reliable to operation and non-maintaining, without using SF6 gases, environmentally friendly, the feature of environmental protection is strong;
(2), this programme remove using non-SF6 insulating gas (N2, CO2, dry air, non-greenhouse effects forming gas etc.) Outside instead of SF6 insulating gas, there is following distinguish with existing product:Non- SF6 gases are served only for insulation rather than arc extinguishing, All arc extinguishings of this programme are completed by vacuum interrupter, and breaker unit cabinet, the load switching unit cabinet at place pass through phase The vacuum interrupter answered carries out arc extinguishing, and arc extinction performance is good, and does not influence insulation effect;
(3), this programme has used integrated three-station, including connection position, isolated bit, ground connection position, switch arrangement to exist Bus bar side, it is few to ensure that switch produces electric arc;Cable grounding is common by three-station and breaker or vacuum load switch Realize, ensure that the safety of ground connection;Three-station incorporates the function of both disconnecting switch and earthed switch, and by one Knife is completed, and can thus realize mechanical latching, prevents major loop powered conjunction earthing knife-switch, and security is more preferable;
(4), breaker herein can be vacuum load switch, and breaker or vacuum load switch use pole, Pole meets the requirement of vacuum extinction outdoor insulation, and original gas isolated products of SF6 need to only use installing type pole, but If being non-SF6 gas-insulated ring networks cabinet using installing type pole, insulation and arc quenching effect are bad, and security substantially reduces, we The vacuum interrupter conductive pieces related to breaker are embedded into epoxy resin or thermoplastic by the pole of case simultaneously Pole is formed in this kind of solid insulating material easily solidified, whole circuit breaker polar is turned into the part of an entirety, Its modularized design, simple in construction, detachable part is few, and reliability is high;With high insulating bar ability, it is by surface insulation Become volume insulation, compared to air insulation, reduce the influence of environment, substantially increase dielectric strength;It can make breaker chi Very little diminution, be advantageous to switch cubicle miniaturization;
(5), to prevent the influence expanded with heat and contract with cold to vacuum interrupter of epoxy part, vacuum extinction chamber enclosure makees encapsulated place Reason;Ensure vacuum interrupter good insulation preformance at different temperatures, arc quenching effect is not influenceed by epoxy part, and arc quenching effect can Lean on;
(6), operating mechanism is three-station, breaker integrated mechanism, and two mechanism interlockings, connection is relatively reliable, Maloperation is avoided, is operated safer.
Brief description of the drawings
Fig. 1 is inside elevation view of the present utility model;
Fig. 2 is inner right side schematic diagram of the present utility model;
Fig. 3 is Section A-A schematic diagram of the present utility model;
Fig. 4 is bottom up F direction schematic diagrams of the present utility model.
Label declaration in figure:
1st, air chamber;11st, mother device;12nd, three-station;121st, static contact;122nd, grounding contact;123rd, moving contact;13、 Breaker;14th, bus;15th, outlet casing tube;16th, gas tank;161st, 162, sealing flange;163rd, pressure relief device I;2nd, mechanism chamber; 21st, three-position switch operation mechanism;22nd, circuit breaker operation mechanism;3rd, control room;4th, cable vault;41st, pressure relief device II;5th, let out Pressure chamber;6th, mother device room.
Embodiment
With reference to Figure of description and specific embodiment, the utility model is described in detail.
Embodiment 1
As Figure 1-4, it is a kind of without bin static contact non-SF 6 gas insulative switchgear, including air chamber 1, mechanism chamber 2, Control room 3, cable vault 4, pressure releasing chamber 5 and mother device room 6, air chamber 1 include be sequentially connected mother device 11, three-station 12, Breaker 13, bus 14, outlet casing tube 15 and gas tank 16, three-station 12, breaker 13, bus 14 are arranged on closed gas In case 16 so that switchgear is non-maintaining, and effectively prevents destruction of the severe environmental conditions to insulating properties, ensures switchgear Normally, safe operation.Mother device 11, outlet casing tube 15 are arranged on the housing of gas tank 16, play external equipment and cable and gas tank The connection of internal switch, described gas tank 16 are welded by stainless steel plate.Non- SF6 insulating gas is filled with gas tank 16, it is described Non- SF6 insulating gas be nitrogen, carbon dioxide, the forming gas of dry air or non-greenhouse effects.Pacify in mechanism chamber 2 Dress three-position switch operation mechanism 21 and circuit breaker operation mechanism 22, control room 3 are provided with air gauge etc..The pressure releasing chamber 5 can To the direct pressure release of bottom cable duct, special pressure release passage is may also set up to outdoor pressure release.Pole meets vacuum interrupter The requirement of external insulation, in the prior art, original gas isolated products of SF6 need to only use installing type pole, but be non-SF6 gas Body uses installing type pole, and insulation and arc quenching effect are bad, and security substantially reduces, and the pole of this programme is by vacuum extinction The room conductive pieces related to breaker are embedded into epoxy resin or this kind of solid insulation easily solidified of thermoplastic simultaneously Pole is formed in material, whole circuit breaker polar is turned into the part of an entirety, its modularized design is simple in construction, Detachable part is few, and reliability is high;With high insulating bar ability, surface insulation is become solid insulation by it, compared to air Insulation, reduces the influence of environment, substantially increases dielectric strength;It can reduce breaker size, and it is small to be advantageous to switch cubicle Type;
Described breaker 13 is solid-sealing vacuum arc extinguishing breaker.Described breaker 13 includes a main shaft and couples three Insulated tension pole on phase breaker, main shaft are connected by sealing flange 162 with the circuit breaker operation mechanism 22 outside gas tank 16, open circuit The actuating three-phase breaker of device operating mechanism 22 synchronously completes combined floodgate or separating brake;The end of incoming cables of breaker 13 is dynamic with three-station 12 Contact 123 connects, leading-out terminal and bus 14 connect.
Described mother device 11 is fixed sealing type mother device, mother device 11 be arranged on gas tank 16 top or sidepiece or top, Sidepiece is installed simultaneously, part connection outer other switchgears or inlet wire cable of the mother device 11 outside gas tank 16, in gas tank Part inside 16 is connected with the static contact 121 of three-station 12.Static contact 121 is the static contact without bin, is shaped as C-shaped Structure, one end are connected with three-station 12, and one end is connected with mother device 11.
Described three-station 12 is coaxial rotary disconnecting link formula switch, and three-station 12 passes through sealing flange 161 It is connected with the three-position switch operation mechanism 21 outside gas tank 16, the actuating three-station 12 of three-position switch operation mechanism 21 is distinguished It is connected to connection position, isolated bit and ground connection position;Be connected after the three-phase short circuit of grounding contact 122 with the housing of gas tank 16, moving contact 123 with The end of incoming cables of breaker 13 connects.The three-station 12 of integration, switch generation electric arc is few, incorporates disconnecting switch and ground connection is opened Both functions are closed, and are completed by a knife, mechanical latching can be thus realized, prevent the powered conjunction earthing knife-switch of major loop, are pacified Full property is more preferable.
Described bus 14 is naked copper formula, and the one end of bus 14 is connected with the leading-out terminal of breaker 13, the other end and lead collar Pipe 15 connects.Described outlet casing tube 15 is fixed sealing type;Part inside gas tank 16 is connected with bus 14, outside gas tank 16 Part be connected with outlet cable.
The major loop of the switchgear of this programme is by mother device 11, three-station 12, breaker 13, bus 14 and outlet Sleeve pipe 15 is formed, and earth-return circuit is made up of gas tank 16, three-station 12, breaker 13, bus 14, outlet casing tube 15.Entering Row operation, corresponding position is connected to by the actuating three-station 12 of three-position switch operation mechanism 21, switched Switching action, use solid-sealing vacuum arc extinguishing breaker so that in the gas tank 16 of insulation by vacuum interrupter complete go out Arc works, and the structure of fixed sealing type ensure that, the high intensity of insulation effect.Vacuum interrupter utilizes high vacuum operational insulation arc extinguishing Medium, the on-off function of power circuit is realized by sealing a pair of contacts in a vacuum, when it disconnects the electric current of certain numerical value When, dynamic/static contact in the moment of separation, current constriction to contact just separated a little on, occur resistance between electrode acutely increase and Temperature improves rapidly, until the evaporation of electrode metal occurs, while forms high electric-field intensity, cause extremely strong strong transmitting and Gap breakdown, produce vacuum arc, when power current is close to zero, at the same be also clearance between open contacts increase, vacuum arc etc. Gas ions spread to surrounding quickly, and after arc current zero passage, the medium of contact gap is changed into insulator from electric conductor rapidly, then Electric current is broken.Due to the special tectonic of contact, contact gap can produce appropriate longitudinal magnetic field during arcing, and this magnetic field can make Electric arc is evenly distributed on contact surface, maintains low arc voltage, so that vacuum interrupter has dielectric strength after higher arc Resume speed, small arc energy and small corrosion rate.So, just improve the ability of vacuum interrupter drop-out current and make Use the life-span.Breaker 13 directly carries out arc extinguishing processing, avoids because non-SF6 gases are under insulation effect, arc extinguishing is incomplete Effect.
Embodiment 2
Embodiment 2 is substantially the same manner as Example 1, in addition to, the pressure release of anti-internal arcing is installed on described gas tank 16 Device I163.Pressure relief device I163, pressure relief device can be the various dresses that can carry out pressure release in the electrical apparatus such as relief valve Put, vent pressure can be adjusted as needed, ensure that the pressure in gas tank 16 will not be too high, and switchgear is safe, steady It is fixed.
Embodiment 3
Embodiment 3 and embodiment 1 or 2 are essentially identical, in addition to, described cable vault 4 is provided with pressure relief device II41.Let out Pressure device can be the various devices that can carry out pressure release in the electrical apparatus such as relief valve, automatic decompression device, ensure that gas Pressure in case 16 will not be too high, and switchgear is safe and stable.
Embodiment 4
Embodiment 4 and embodiment 1 or 2 or 3 are essentially identical, and difference is, the three-station of this programme is using rotation Gyration is 90 ° of three-station, because static contact is arranged to the C-shaped configuration of no bin, it is necessary to set angle initialization only to need Reach 90 °, avoid because operating mechanism caused by the irregular angle of existing 105 ° of switch is when being operated It is not in place or excessive to wait switch, ensure that switch is stable in switching action, folding efficiency high.
Embodiment 5
Embodiment 5 is substantially the same manner as Example 1, and difference is, bus 14 is naked copper rod, the one end of bus 14 and open circuit Leading-out terminal connection, the other end and the outlet casing tube 15 of device 13 connect.Bus 14 is naked connection bus;It is outside directly and insulating gas Contact, it is not necessary to closed using outer sleeve.Fixed sealing type or the outside bus set must be used in normal design, by Employ the arc extinguishing device in non-SF6 gases in this programme, vacuum interrupter make it that its arc quenching effect is more preferable, its ensure design away from From under conditions of, insulating properties and arc extinction performance are fine, using it is naked connection bus can ensure insulation and arc quenching effect it is up to standard, And can reduce environmental pollution, it is cost-effective.
Schematically the invention and embodiments thereof are described above, this describe it is no restricted, not In the case of the spirit or essential characteristics of the present invention, the present invention can be realized in other specific forms.Institute in accompanying drawing What is shown is also one of embodiment of the invention, and actual structure is not limited thereto, any attached in claim Icon note should not limit involved claim.So if one of ordinary skill in the art is enlightened by it, do not departing from In the case of this creation objective, the frame mode similar to the technical scheme and embodiment are designed without creativeness, all should Belong to the protection domain of this patent.In addition, the word of " comprising " one is not excluded for other elements or step, "one" word before element It is not excluded for including " multiple " element.The multiple element stated in claim to a product can also by an element by software or Person hardware is realized.The first, the second grade word is used for representing title, and is not offered as any specific order.

Claims (10)

1. one kind is without bin static contact non-SF 6 gas insulative switchgear, it is characterised in that:Including air chamber (1), mechanism chamber (2), Control room (3), cable vault (4), pressure releasing chamber (5) and mother device room (6), air chamber (1) include be sequentially connected mother device (11), three Position switch (12), breaker (13), bus (14), outlet casing tube (15) and gas tank (16), three-station (12), breaker (13), bus (14) is arranged in closed gas tank (16), and mother device (11), outlet casing tube (15) are arranged on gas tank (16) housing On, it is filled with non-SF6 insulating gas in gas tank (16), described breaker (13) is solid-sealing vacuum arc extinguishing breaker, mother device (11) other switchgear or inlet wire cables outside the part connection outside gas tank, in the internal part of gas tank (16) and three works Static contact (121) connection of bit switch (12), described static contact (121) is the static contact without bin.
2. one kind according to claim 1 is without bin static contact non-SF 6 gas insulative switchgear, it is characterised in that:Institute The non-SF6 insulating gas stated is the forming gas of nitrogen, carbon dioxide, dry air or non-greenhouse effects.
3. one kind according to claim 1 is without bin static contact non-SF 6 gas insulative switchgear, it is characterised in that:Institute The mother device (11) stated is fixed sealing type mother device, and mother device (11) is arranged on top or the sidepiece of gas tank (16), or top and side Install simultaneously in portion.
4. one kind according to claim 1 or 3 is without bin static contact non-SF 6 gas insulative switchgear, it is characterised in that: Described three-station (12) is coaxial rotary disconnecting link formula switch, three-station (12) by sealing flange (161) with Three-position switch operation mechanism (21) connection outside gas tank, three-position switch operation mechanism (21) actuating three-station arrive respectively Connection position, isolated bit and ground connection position;Be connected after grounding contact (122) three-phase short circuit with gas tank (16) housing, moving contact (123) with Breaker (13) end of incoming cables connects.
5. one kind according to claim 1 is without bin static contact non-SF 6 gas insulative switchgear, it is characterised in that:Institute The breaker (13) stated includes main shaft and couples insulated tension pole on three-phase breaker, main shaft by sealing flange (162) with Circuit breaker operation mechanism (22) connection of gas tank (16) outside, circuit breaker operation mechanism (22) actuating three-phase breaker synchronously complete conjunction Lock or separating brake;Breaker (13) end of incoming cables is connected with the moving contact (123) of three-station (12), leading-out terminal and bus (14) connect Connect.
6. one kind according to claim 5 is without bin static contact non-SF 6 gas insulative switchgear, it is characterised in that:Institute The bus (14) stated is naked copper rod, and bus (14) one end is connected with the leading-out terminal of breaker (13), the other end and outlet casing tube (15) connect.
7. one kind according to claim 1 or 6 is without bin static contact non-SF 6 gas insulative switchgear, it is characterised in that: Described outlet casing tube (15) is fixed sealing type;It is connected in the internal part of gas tank (16) with bus (14), it is outside in gas tank (16) Part be connected with outlet cable.
8. one kind according to claim 1 is without bin static contact non-SF 6 gas insulative switchgear, it is characterised in that:Institute The gas tank (16) stated is welded by stainless steel plate.
9. one kind according to claim 1 or 8 is without bin static contact non-SF 6 gas insulative switchgear, it is characterised in that: The pressure relief device I (163) of anti-internal arcing is installed on described gas tank (16).
10. one kind according to claim 1 is without bin static contact non-SF 6 gas insulative switchgear, it is characterised in that:Institute The cable vault (4) stated is provided with pressure relief device II (41).
CN201720432037.0U 2017-04-24 2017-04-24 One kind is without bin static contact non-SF 6 gas insulative switchgear Active CN207021580U (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110957663A (en) * 2019-12-02 2020-04-03 中国科学院电工研究所 Ternary mixed gas insulated switchgear with smell perception function

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110957663A (en) * 2019-12-02 2020-04-03 中国科学院电工研究所 Ternary mixed gas insulated switchgear with smell perception function

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