CN110048382A - Mechanical dc circuit breaker and its application method based on the transfer of liquid arc voltage - Google Patents
Mechanical dc circuit breaker and its application method based on the transfer of liquid arc voltage Download PDFInfo
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- CN110048382A CN110048382A CN201910332294.0A CN201910332294A CN110048382A CN 110048382 A CN110048382 A CN 110048382A CN 201910332294 A CN201910332294 A CN 201910332294A CN 110048382 A CN110048382 A CN 110048382A
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- branch
- circuit breaker
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
- H02H3/087—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current for dc applications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/268—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured for dc systems
Landscapes
- Arc-Extinguishing Devices That Are Switches (AREA)
Abstract
The invention discloses a kind of mechanical dc circuit breakers and its application method based on the transfer of liquid arc voltage, mechanical dc circuit breaker includes the first incoming end, second incoming end, primary current leg, shift branch and energy consumption branch, the primary current leg includes liquid fracture, the liquid fracture includes cavity, static contact and moving contact, when mechanically dc circuit breaker electric current is through-flow, moving contact is closed static contact, the primary current leg passes through electric current, transfer branch and energy consumption branch are not turned on, when short trouble occurs for mechanical dc circuit breaker, moving contact is pulled open with the arc vaporization liquid medium that generates between moving contact and static contact to form liquid jet, the liquid jet pushes arc motion to increase arc voltage, electric current is transferred to transfer branch, capacitor charging establishes drop-out voltage so that electric current forced branch extremely to be consumed energy Branch completion is cut-off.
Description
Technical field
The present invention relates to mesohigh dc circuit breaker technical fields, are based particularly on the mechanical of liquid arc voltage transfer
Dc circuit breaker and its application method.
Background technique
With the continuous promotion of power system capacity, direct current electric transmission and transformation system and equipment flourish, while also to system
More stringent requirements are proposed for stable and safety.Inside the various failures that electric system may occur, most for power grid harm
Greatly, it is exactly short trouble that probability of happening is very high.After short trouble occurs in electric system, zooming short circuit current meeting
Extremely serious consequence is caused, therefore, has the dc circuit breaker of Fault Isolation and excision function for realizing direct current system
Safe and reliable operation is indispensable.Mechanical dc circuit breaker has the advantage that specified through-flow loss is small, connecting-disconnecting function is strong, in
High voltage direct current is with a wide range of applications in cut-offfing.However, traditional mechanical dc circuit breaker utilizes the gas such as vacuum, SF6
Medium recovery performance is poor as fracture dielectric, after there are fracture arc voltages low, arc for body medium, fracture serial number mostly etc.
Bottleneck problem seriously constrains the promotion of dc circuit breaker connecting-disconnecting function and reliability.For existing machinery formula dc circuit breaker
The problem of fracture performance deficiency, the invention proposes mechanical dc circuit breaker of the kind based on fluid insulation fracture, utilize liquid
The physical attributes such as medium significantly flows, heat transfer, dielectric insulation restores energy after promoting interrupting process arc voltage amplitude and arc
Power is much higher than gas and vacuum arc, and then facilitates electric current fast transfer, promotes fracture insulation voltage endurance capability, reduces fracture string
Join quantity, promotes Breaking capacity and reliability, significantly reduce the cost and volume of dc circuit breaker.
Disclosed above- mentioned information are used only for enhancing the understanding to background of the present invention in the background section, it is thus possible to
Information comprising not constituting the prior art known to a person of ordinary skill in the art in home.
Summary of the invention
In view of the deficiency of the prior art or defect, the purpose of the present invention is to provide one kind to be based on liquid electric arc
The mechanical dc circuit breaker and its application method of voltage transfer.The physics such as tonneau significantly flows with liquid medium, heat transfer
Attribute, dielectric insulation recovery capability is much higher than gas and vacuum arc after promoting interrupting process arc voltage amplitude and arc, in turn
Facilitate electric current fast transfer, promote fracture and insulate voltage endurance capability, reduce fracture serial number, promotes Breaking capacity and reliable
Property, the cost and volume of mechanical dc circuit breaker are significantly reduced, so that dc circuit breaker obtains stronger connecting-disconnecting function and more
High fracture dielectric strength.
Specifically, the present invention adopts the following technical scheme:
It is a kind of based on liquid arc voltage transfer mechanical dc circuit breaker include,
First incoming end is configured to the inlet wire of mechanical dc circuit breaker；
Second incoming end is configured to the outlet of mechanical dc circuit breaker；
Primary current leg, is connected between first incoming end and the second incoming end, and the primary current leg includes
Liquid fracture, the liquid fracture include,
Cavity, it is interior to seal liquid medium,
Static contact is sealingly fixed in the cavity, and one end of the static contact is fixed in the cavity, described
The other end of static contact connects the first incoming end；
Moving contact movably seals in the cavity, and one end of the moving contact can abut against or contact institute
Static contact is stated, the other end connects the second incoming end；
Branch is shifted, is connected between first incoming end and the second incoming end and the in parallel primary current leg,
Shifting branch includes capacitor；
Consume energy branch, be connected between first incoming end and the second incoming end and the in parallel primary current leg and
Shift branch, wherein
When mechanically dc circuit breaker electric current is through-flow, moving contact is closed static contact, and the primary current leg is turned by electric current
Move branch and energy consumption branch be not turned on, when short trouble occurs for mechanical dc circuit breaker, pull open moving contact with moving contact with
For the arc vaporization liquid medium generated between static contact to form liquid jet, the liquid jet pushes arc motion to increase
Arc voltage, electric current are transferred to transfer branch, and capacitor charging establishes drop-out voltage with by electric current forced branch to the branch that consumes energy
Completion is cut-off.
In the mechanical dc circuit breaker, the drop-out voltage is greater than the conduction threshold of energy consumption branch.
In the mechanical dc circuit breaker, the primary current leg includes liquid fracture, vacuum fracture, high speed machine
The series-parallel combination of switch.
In the mechanical dc circuit breaker, the primary current leg includes liquid fracture and concatenated diode group
Part.
In the mechanical dc circuit breaker, the liquid medium of the liquid fracture includes distilled water, transformer oil, plant
Object oil, liquid C5F10O, mineral oil or silicone oil.
In the mechanical dc circuit breaker, the transfer branch includes preliminary filling electric-type LC formula transfer branch, without preliminary filling
Electric-type LC formula shifts branch, bridge-type LC transfer branch or magnetic coupling type and shifts branch.
In the mechanical dc circuit breaker, mechanical dc circuit breaker is unidirectional mechanical formula dc circuit breaker or two-way
Mechanical dc circuit breaker.
In the mechanical dc circuit breaker, the energy consumption branch includes metal oxide arrester, line type metal
Oxide Arrester, gapless Line type's MOA, all insulation polymeric metal oxide surge arrester and its
Combination.
In the mechanical dc circuit breaker, after electric current is transferred to transfer branch, electricity is cut-off by solid-state switch foundation
Pressure, by electric current forced branch to energy consumption branch to complete to cut-off.
According to another aspect of the present invention, a kind of application method of the mechanical dc circuit breaker includes the following steps,
First step, mechanical dc circuit breaker electric current is through-flow, and moving contact is closed static contact, and the primary current leg passes through
Electric current, transfer branch and energy consumption branch are not turned on,
Second step pulls open moving contact in moving contact and static contact when short trouble occurs for mechanical dc circuit breaker
Between the arc vaporization liquid medium that generates to form liquid jet, the liquid jet pushes arc motion to increase electric arc electricity
Pressure, electric current are transferred to transfer branch,
Third step, capacitor charging establish drop-out voltage with by electric current forced branch to the branch that consumes energy, under ultimate current
Zero is down to realize direct current disjunction.
Beneficial effect
The present invention has the primary current leg of liquid fracture by design so that breaker obtain stronger connecting-disconnecting function and
Stronger fracture dielectric strength.It is significantly flowed using liquid medium, the physical attributes such as heat transfer, the electric arc electricity of interrupting process
Dielectric insulation recovery capability is much higher than gas and vacuum arc after pressure amplitude value and arc, and electric current fast transfer may be implemented, save auxiliary
Transfer electrical power electronic device and recharged capacitance are helped, fracture serial number is reduced, while promoting Breaking capacity and reliability
The cost and volume of mechanical dc circuit breaker can be significantly reduced.
Detailed description of the invention
Referring to attached drawing, above-mentioned and other objects, features and advantages of the present invention, following theory through the embodiment of the present invention
Bright property and non-limiting detailed description will be better understood when, in which:
Fig. 1 is breaker body structural schematic diagram；
Fig. 2 (a) to Fig. 2 (f) is breaker interrupting process schematic diagram of the present invention；
Fig. 3 is liquid fracture-without precharge LC transfer Branch Type structural schematic diagram；
Fig. 4 is liquid fracture-magnetic coupling electric current transfer Branch Type structural schematic diagram；
Fig. 5 is liquid fracture-bridge-type LC transfer Branch Type structural schematic diagram；
Fig. 6 is liquid fracture-LC- bridge-type two-way solid-state switch transfer Branch Type structural schematic diagram.
All attached drawings are all schematical, it is not necessary to completely the same.Below in conjunction with drawings and examples to the present invention
It is further explained.
Specific embodiment
Described in detail below be actually merely exemplary and be not intended to limit application and use.In addition, being not intended to
By any clear of the above technical field, background, brief overview or middle presentation described in detail below or the theoretical constraint implied.It removes
Non-clearly there is opposite description, otherwise word " comprising " and its different modifications should be understood that implicit includes the portion
Part but it is not excluded for any other component.
Illustrate a specific embodiment of the invention to attached drawing 6 below in conjunction with attached drawing 1.
Fig. 1 is breaker body structural schematic diagram, a kind of mechanical dc circuit breaker based on the transfer of liquid arc voltage
Including,
First incoming end is configured to the inlet wire of mechanical dc circuit breaker；
Second incoming end is configured to the outlet of mechanical dc circuit breaker；
Primary current leg, is connected between first incoming end and the second incoming end, and the primary current leg includes
Liquid fracture, the liquid fracture include,
Cavity, it is interior to seal liquid medium,
Static contact is sealingly fixed in the cavity, and one end of the static contact is fixed in the cavity, described
The other end of static contact connects the first incoming end；
Moving contact movably seals in the cavity, and one end of the moving contact can abut against or contact institute
Static contact is stated, the other end connects the second incoming end；
Branch is shifted, is connected between first incoming end and the second incoming end and the in parallel primary current leg,
Shifting branch includes capacitor；
Consume energy branch, be connected between first incoming end and the second incoming end and the in parallel primary current leg and
Shift branch, wherein
When mechanically dc circuit breaker electric current is through-flow, moving contact is closed static contact, and the primary current leg is turned by electric current
Move branch and energy consumption branch be not turned on, when short trouble occurs for mechanical dc circuit breaker, pull open moving contact with moving contact with
For the arc vaporization liquid medium generated between static contact to form liquid jet, the liquid jet pushes arc motion to increase
Arc voltage, electric current are transferred to transfer branch, and capacitor charging establishes drop-out voltage with by electric current forced branch to the branch that consumes energy
Completion is cut-off.
In one embodiment of the mechanical dc circuit breaker, the drop-out voltage is greater than the conducting threshold of energy consumption branch
Value.
In one embodiment of the mechanical dc circuit breaker, the primary current leg includes liquid fracture, vacuum
The series-parallel combination of fracture, high speed machine switch.
In one embodiment of the mechanical dc circuit breaker, the primary current leg includes liquid fracture and series connection
Diode assembly.
In one embodiment of the mechanical dc circuit breaker, the liquid medium of the liquid fracture includes distillation
Water, transformer oil, vegetable oil, liquid C5F10O, mineral oil or silicone oil.
In one embodiment of the mechanical dc circuit breaker, the transfer branch includes the transfer of preliminary filling electric-type LC formula
Branch shifts branch without preliminary filling electric-type LC formula transfer branch, bridge-type LC transfer branch or magnetic coupling type.
In one embodiment of the mechanical dc circuit breaker, mechanical dc circuit breaker is unidirectional mechanical formula direct current
Breaker or two-way mechanical formula dc circuit breaker.
In one embodiment of the mechanical dc circuit breaker, the energy consumption branch includes that metal oxide is lightning-arrest
Device, Line type's MOA, gapless Line type's MOA, the oxidation of all insulation composite sheath metal
Object arrester and combinations thereof.
In one embodiment of the mechanical dc circuit breaker, after electric current is transferred to transfer branch, opened by solid-state
Drop-out voltage is established in pass, by electric current forced branch to energy consumption branch to complete to cut-off.
In one embodiment, Fig. 3 is liquid fracture-without precharge LC transfer Branch Type structural schematic diagram；Fig. 4 is liquid
Fracture-magnetic coupling electric current shifts Branch Type structural schematic diagram.Fig. 5 is liquid fracture-bridge-type LC transfer Branch Type structural schematic diagram.
Fig. 6 is liquid fracture-LC- bridge-type two-way solid-state switch transfer Branch Type structural schematic diagram.It can be further understood by attached drawing
The present invention.
In the present invention, a kind of application method of the mechanical dc circuit breaker includes the following steps,
First step, mechanical dc circuit breaker electric current is through-flow, and moving contact is closed static contact, and the primary current leg passes through
Electric current, transfer branch and energy consumption branch are not turned on,
Second step pulls open moving contact in moving contact and static contact when short trouble occurs for mechanical dc circuit breaker
Between the arc vaporization liquid medium that generates to form liquid jet, the liquid jet pushes arc motion to increase electric arc electricity
Pressure, electric current are transferred to transfer branch,
Third step, capacitor charging establish drop-out voltage with by electric current forced branch to the branch that consumes energy, under ultimate current
Zero is down to realize direct current disjunction.
In one embodiment, Fig. 2 (a) to Fig. 2 (e) gives structure when the mechanical dc circuit breaker works
Schematic diagram, specific interrupting process are as follows:
(1) as shown in Fig. 2 (a), under nominal situation, rated current is all flowed through from primary current leg, shifts capacitor preliminary filling
There is certain voltage；
(2) it as shown in Fig. 2 (b), when short trouble occurs, when needing disjunction short circuit current, is quickly opened to liquid incision position
It closes S1 and sends disjunction instruction, dynamic/static contact is opened, and after dynamic/static contact is opened away from certain distance is reached, is controlled turn on thyristors, is made
The conducting of VT1 thyristor groups, recharged capacitance are shifted by transfer inductive discharge, electric current to transfer branch；
(3) as shown in Fig. 2 (c), the electric current of primary current leg is fully transferred to rapidly transfer branch, and the electric current for flowing through S1 becomes
It is zero, primary current leg is completed to open；
(4) as shown in Fig. 2 (d), as system power supply persistently gives capacitor reverse charging, capacitor voltage polarity occur reversion and
Constantly increase；
(5) as shown in Fig. 2 (e), voltage reaches pressure limiting energy consumption branch conducting voltage, then the conducting of pressure limiting energy consumption branch
(6) as shown in Fig. 2 (f), system power is fully transferred to pressure limiting energy consumption branch, and ultimate current drops to zero, disjunction
Overall process is completed.
The above content is a further detailed description of the present invention in conjunction with specific preferred embodiments, and it cannot be said that
A specific embodiment of the invention is only limitted to this, for those of ordinary skill in the art to which the present invention belongs, is not taking off
Under the premise of from present inventive concept, several simple deduction or replace can also be made, such as deduces out and is opened based on unidirectional solid-state
The unidirectional mechanical formula dc circuit breaker etc. for closing branch and unidirectional oscillation branch, all shall be regarded as belonging to the power of the invention by being submitted
Sharp claim determines protection scope.
Claims (10)
1. a kind of mechanical dc circuit breaker based on the transfer of liquid arc voltage comprising,
First incoming end is configured to the inlet wire of mechanical dc circuit breaker；
Second incoming end is configured to the outlet of mechanical dc circuit breaker；
Primary current leg is connected between first incoming end and the second incoming end, and the primary current leg includes liquid
Fracture, the liquid fracture include,
Cavity, it is interior to seal liquid medium,
Static contact is sealingly fixed in the cavity, and one end of the static contact is fixed in the cavity, the stationary contact
The other end of head connects the first incoming end；
Moving contact movably seals in the cavity, and one end of the moving contact can abut against or contact described quiet
Contact, the other end connect the second incoming end；
Branch is shifted, is connected between first incoming end and the second incoming end and the in parallel primary current leg, transfer
Branch includes capacitor；
Consume energy branch, is connected between first incoming end and the second incoming end and the in parallel primary current leg and transfer
Branch, wherein
When mechanically dc circuit breaker electric current is through-flow, moving contact is closed static contact, and the primary current leg passes through electric current, transfer branch
Road and energy consumption branch are not turned on, and when short trouble occurs for mechanical dc circuit breaker, pull open moving contact in moving contact and stationary contact
For the arc vaporization liquid medium generated between head to form liquid jet, the liquid jet pushes arc motion to increase electric arc
Voltage, electric current are transferred to transfer branch, and capacitor charging establishes drop-out voltage to complete electric current forced branch to energy consumption branch
It cut-offs.
2. mechanical dc circuit breaker according to claim 1, which is characterized in that preferred, the drop-out voltage is greater than
The conduction threshold of energy consumption branch.
3. mechanical dc circuit breaker according to claim 1, which is characterized in that the primary current leg includes that liquid is disconnected
The series-parallel combination of mouth, vacuum fracture, high speed machine switch.
4. mechanical dc circuit breaker according to claim 1, which is characterized in that the primary current leg includes that liquid is disconnected
Mouth and concatenated diode assembly.
5. mechanical dc circuit breaker according to claim 1, which is characterized in that the liquid medium packet of the liquid fracture
Include distilled water, transformer oil, vegetable oil, liquid C5F10O, mineral oil or silicone oil.
6. mechanical dc circuit breaker according to claim 1, which is characterized in that the transfer branch includes preliminary filling electric-type
LC formula shifts branch, shifts branch without preliminary filling electric-type LC formula transfer branch, bridge-type LC transfer branch or magnetic coupling type.
7. mechanical dc circuit breaker according to claim 1, which is characterized in that mechanical dc circuit breaker includes unidirectional
Mechanical dc circuit breaker or two-way mechanical formula dc circuit breaker.
8. mechanical dc circuit breaker according to claim 1, which is characterized in that the energy consumption branch includes following any
Or any combination thereof: metal oxide arrester, Line type's MOA, gapless line type metal oxide are kept away
Thunder device, all insulation polymeric metal oxide surge arrester.
9. mechanical dc circuit breaker according to claim 1, which is characterized in that after electric current is transferred to transfer branch, lead to
It crosses solid-state switch and establishes drop-out voltage, by electric current forced branch to energy consumption branch to complete to cut-off.
10. the cutoff method of mechanical dc circuit breaker described in a kind of any one of claim 1-9 comprising following steps,
First step, mechanical dc circuit breaker electric current is through-flow, and moving contact is closed static contact, and the primary current leg passes through electricity
Stream, transfer branch and energy consumption branch are not turned on,
Second step pulls open moving contact when short trouble occurs for mechanical dc circuit breaker between moving contact and static contact
For the arc vaporization liquid medium of generation to form liquid jet, the liquid jet pushes arc motion to increase arc voltage,
Electric current is transferred to transfer branch,
Third step, capacitor charging establish drop-out voltage so that by electric current forced branch to the branch that consumes energy, ultimate current drops to
Zero to realize direct current disjunction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201910332294.0A CN110048382A (en) | 2019-04-23 | 2019-04-23 | Mechanical dc circuit breaker and its application method based on the transfer of liquid arc voltage |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910332294.0A CN110048382A (en) | 2019-04-23 | 2019-04-23 | Mechanical dc circuit breaker and its application method based on the transfer of liquid arc voltage |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111243900A (en) * | 2020-01-19 | 2020-06-05 | 国网江苏省电力有限公司电力科学研究院 | Liquid sulfur hexafluoride arc voltage transfer type direct current circuit breaker and control method thereof |
| CN111371441A (en) * | 2020-03-26 | 2020-07-03 | 思源电气股份有限公司 | Controllable turn-off mechanical direct current circuit breaker |
| CN111863465A (en) * | 2020-07-22 | 2020-10-30 | 西安交通大学 | Double-station circuit breaker, direct-current combined electrical apparatus applied to double-station circuit breaker and working method of double-station circuit breaker |
| CN112803357A (en) * | 2021-03-02 | 2021-05-14 | 国网陕西省电力公司电力科学研究院 | Direct current breaker based on combination of current limiting and oscillation transfer and control method thereof |
| WO2021114599A1 (en) * | 2019-12-11 | 2021-06-17 | 全球能源互联网研究院有限公司 | Passive semi-controlled hybrid direct current circuit breaker and control method therefor |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2021114599A1 (en) * | 2019-12-11 | 2021-06-17 | 全球能源互联网研究院有限公司 | Passive semi-controlled hybrid direct current circuit breaker and control method therefor |
| CN111243900A (en) * | 2020-01-19 | 2020-06-05 | 国网江苏省电力有限公司电力科学研究院 | Liquid sulfur hexafluoride arc voltage transfer type direct current circuit breaker and control method thereof |
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| CN111863465A (en) * | 2020-07-22 | 2020-10-30 | 西安交通大学 | Double-station circuit breaker, direct-current combined electrical apparatus applied to double-station circuit breaker and working method of double-station circuit breaker |
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| CN112803357A (en) * | 2021-03-02 | 2021-05-14 | 国网陕西省电力公司电力科学研究院 | Direct current breaker based on combination of current limiting and oscillation transfer and control method thereof |
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Application publication date: 20190723 |