CN106970322A - Hybrid high voltage DC breaker Fast mechanical switch dynamic voltage balancing test system - Google Patents
Hybrid high voltage DC breaker Fast mechanical switch dynamic voltage balancing test system Download PDFInfo
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- CN106970322A CN106970322A CN201710384008.6A CN201710384008A CN106970322A CN 106970322 A CN106970322 A CN 106970322A CN 201710384008 A CN201710384008 A CN 201710384008A CN 106970322 A CN106970322 A CN 106970322A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
- G01R31/3271—Testing of circuit interrupters, switches or circuit-breakers of high voltage or medium voltage devices
- G01R31/3272—Apparatus, systems or circuits therefor
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
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- Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
Abstract
The invention provides a kind of hybrid high voltage DC breaker Fast mechanical switch dynamic voltage balancing test system, including：Multiple RC dividers, a plurality of coaxial cable and a signal processor；The high-pressure side of the high-voltage arm of each RC divider is coupled the high-pressure side of hybrid each vacuum interrupter of high voltage DC breaker Fast mechanical switch, the low pressure terminal ground potential of its low-voltage arm, for measuring the voltage signal of the high-pressure side of each vacuum interrupter over the ground respectively；The low-pressure end of the high-voltage arm of each RC divider and the high-pressure side of low-voltage arm distinguish one end of each coaxial cable of equipotential bonding, the other end of coaxial cable is connected with signal processor, and the high-voltage signal for RC divider to be detected is converted into low-voltage signal and is sent to signal processor；The low-voltage signal that signal processor is used to be transmitted according to coaxial cable carries out difference operation to each vacuum interrupter high-pressure side voltage-to-ground, to obtain the voltage signal that the vacuum interrupter between two adjacent RC dividers is born at each moment.
Description
Technical field
It is more particularly to a kind of fast for hybrid high voltage DC breaker the invention belongs to high voltage and insulation technology field
Fast mechanical switch dynamic voltage balancing test system.
Background technology
In Technology of HVDC based Voltage Source Converter field, high voltage DC breaker is mainly used as system master as one of nucleus equipment
Protection device.When line failure, dc circuit breaker needs the completion fault current in several milliseconds to cut-off, and fast failure
The isolation of circuit and reclosing, its reliability directly affects the safe and stable operation of flexible direct current power network.But, due to direct current
Breaker no current zero crossing, it is impossible to which similar AC circuit breaker is realized using current zero-crossing point to be cut-off, it is necessary to artificial creation's electric current
Zero point.
At present, the dc circuit breaker that high-pressure system and extra high voltage system are used generally uses mixed topology structure, profit
With the inside change of current of main through-flow branch road, transfer branch road and the power consumption part in parallel of branch road three under certain sequential, current zero is created
To realize that direct current cut-offs.Wherein, main through-flow branch route Fast mechanical switch and main load valve group are in series, for conducting direct current
System power；Shift the multistage transfer branch road submodule of branch route in series, for carrying direct-current system short-circuit current in short-term, and
Electric capacity is sealed in by fault loop by the change of current, transient state drop-out voltage is set up；The branch that consumes energy route multiple arrester group parallel connections and constituted, and uses
Overvoltage and absorption circuit are cut-off in suppression and put down anti-storage energy.Its operation principle is as follows：
A) when system is normally run, system power is turned on through Fast mechanical switch and main load valve group；
When system dc or short-circuit current b) need to be cut-off, the multistage transfer branch road submodule of triggering transfer branch road series connection
Block, then main load valve group in locking main branch, electric current is forced to be transferred in transfer branch road, Fast mechanical switch current over-zero
Disjunction；
C) Fast mechanical switch is resistant to system overvoltage, the multistage transfer branch road submodule of locking transfer branch road series connection
Block, electric current absorbs through branch road consumption of consuming energy, and realizes that system dc or the effective of short-circuit current cut-off.
Wherein, Fast mechanical switch cut-offs part for mixed type dc circuit breaker without arc, main function during normal operation
It is through-flow；When there is short circuit fault condition, it is necessary to which Fast mechanical switch sets up insulation distance within the Millisecond time, bear to break
Transient state disjunction voltage in the device breaking course of road, realizes quickly isolating for failure.Engineering is high with hybrid high voltage DC breaker
Fast mechanical switch uses multiple vacuum interrupter multi-break serial connection technologies, reduces the pressure-resistant of single fracture, reduces single fracture
Stroke, so as to significantly shorten Fast mechanical switch opening time, improves the overall breaking speed of dc circuit breaker.But it can not be ignored
Be, the Fast mechanical switch based on multi-break serial connection technology by series connection vacuum interrupter direct-to-ground capacitance, switch motion synchronism with
And the influence away from uniformity is opened in insulation, the unbalanced-voltage-division between vacuum interrupter series connection fracture may be caused.The end of the year 2016, China is first
When platform 200kV high voltage DC breakers apply debugging in the soft straight engineering of Zhoushan multiterminal, once occurred in Fast mechanical switch two
Vacuum interrupter delay 1.5s actions cause unsuccessful problem of closing a floodgate.
If each vacuum interrupter break of Fast mechanical switch exceeds the time limit, phenomenon is serious, insulation open away from it is inconsistent when, first move
The insulation for making vacuum interrupter is opened away from big, bears that transient state disjunction voltage is small, and the vacuum interrupter insulation then acted is opened away from small, is held
Vacuum interrupter fracture disruptive discharge big on the contrary by transient state disjunction voltage, being acted after easily causing, immediately Fast mechanical switch
The transient state disjunction voltage at two ends will all put on the vacuum interrupter two ends first acted, and arc-chutes sum is significantly reduced rear or led
First disruptive discharge then occurs for action arc-chutes for cause.Therefore, the dynamic voltage balancing problem of Fast mechanical switch is severe, it is necessary to carry out
Hybrid high voltage DC breaker Fast mechanical switch dynamic voltage balancing test, the hybrid high voltage DC breaker of comprehensive assessment is open-minded
With the reliability of shut-off.
The content of the invention
To solve technical problem present in prior art, the invention provides a kind of hybrid high voltage DC breaker is fast
Fast mechanical switch dynamic voltage balancing test system, the system includes：At multiple RC dividers, a plurality of coaxial cable and a signal
Manage device；
The high-pressure side of the high-voltage arm of each RC divider is coupled hybrid high voltage DC breaker Quick mechanical respectively
The high-pressure side of each vacuum interrupter is switched, the low pressure terminal ground potential of the low-voltage arm of each RC divider is each for measuring
The voltage signal of the high-pressure side of vacuum interrupter over the ground；
The low-pressure end of the high-voltage arm of each RC divider and the high-pressure side difference equipotential bonding of low-voltage arm are each described
One end of coaxial cable, the other end of the coaxial cable is connected with the signal processor, for by the RC divider
The high-voltage signal detected is converted into low-voltage signal and is sent to the signal processor；
The signal processor is used for the low-voltage signal transmitted according to the coaxial cable to each vacuum interrupter high-pressure side
Voltage-to-ground carries out difference operation, to obtain the electricity that the vacuum interrupter between two adjacent RC dividers is born at each moment
Press signal.
In one embodiment, the system also includes a digital storage oscilloscope, is coupled with the signal processor, uses
The voltage signal born in the acquisition vacuum interrupter at each moment and display.
In one embodiment, the system also includes an isolating transformer, and power supply passes through the isolating transformer
Powered for the digital storage oscilloscope.
In one embodiment, one end of the coaxial cable is coupled the low pressure of the RC divider by coaxial plug
The metal shielding box of arm high-pressure side, the other end is coupled the signal processor also by coaxial plug.
In one embodiment, the coaxial cable is screened cable.
In one embodiment, the multiple RC divider, a plurality of coaxial cable quantity with the Quick mechanical
The quantity comprising vacuum interrupter is identical in switch.
In one embodiment, the quantity of the RC divider is 16, and the quantity of the coaxial cable is 16.
In one embodiment, the frequency response higher limit of the RC divider is 10MHz.
The hybrid high voltage DC breaker Fast mechanical switch dynamic voltage balancing proposed using the embodiment of the present invention tests system
System, can accurately know hybrid high voltage DC breaker Fast mechanical switch each vacuum interrupter two ends electricity in breaking course
The situation of change of pressure, realizes the detection for vacuum interrupter dynamic voltage balancing percentage, effectively judges point of Fast mechanical switch
Whether lock synchronism and switching synchronization meet the standard requirement less than 0.2ms and 1.5ms respectively, so as to ensure hybrid high pressure
Dc circuit breaker Fast mechanical switch Reliability of Microprocessor.
Further, it is additionally provided with digital storage oscilloscope in the embodiment of the present invention, it is possible to use digital storage oscilloscope
The voltage waveform that each vacuum interrupter two ends are born intuitively is observed, and can also store what vacuum interrupter two ends were born
Voltage waveform is for calling.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is the accompanying drawing used required in technology description to be briefly described, it should be apparent that, drawings in the following description are only this
Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, can be with
Other accompanying drawings are obtained according to these accompanying drawings.
Fig. 1 is the topological structure schematic diagram of hybrid high voltage DC breaker when occurring short trouble single-end earthed；
Fig. 2 is the hybrid high voltage DC breaker Fast mechanical switch dynamic voltage balancing test system signal of the embodiment of the present invention
Figure；
Fig. 3 is the both end voltage waveform diagram of two vacuum interrupters 2 that digital storage oscilloscope 16 is shown.
Drawing reference numeral：1- Fast mechanical switch；2- vacuum interrupters；3- main branch converter power modules；The main loads of 4-
Valve group；5- master is through-flow branch road；Short trouble single-end earthed occurs for the hybrid high voltage DC breakers of 6-；7- shifts branch road transverter
Power model；8- shifts branch road submodule；9- shifts branch road；10- thyrite arresters；11- power consumption branch roads；12- capacitance-resistances point
Depressor；13- coaxial cables；14- signal processors；15- digital storage oscilloscopes；16- isolating transformers.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation is described, it is clear that described embodiment is only a part of embodiment of the invention, rather than whole embodiments.It is based on
Embodiment in the present invention, it is every other that those of ordinary skill in the art are obtained under the premise of creative work is not made
Embodiment, belongs to the scope of protection of the invention.
For ease of understanding the embodiment of the present invention, the embodiments of the invention provide a kind of opening up for hybrid high voltage DC breaker
Structure is flutterred, as shown in Figure 1.The hybrid high voltage DC breaker equipment is by leading through-flow branch road 5, transfer branch road 9 and power consumption branch road
11 compose in parallel.Transfer branch road 9 is composed in series by transfer branch road submodule 8, and transfer branch road submodule 8 is changed by multistage transfer branch road
Stream device power model 7 is composed in series.Power consumption branch road 11 is composed in series by multistage thyrite arrester 10.Main through-flow branch road 5 by
Fast mechanical switch 1 and main load valve group 4 are in series, wherein, Fast mechanical switch 1 is connected by 16 vacuum interrupters 2
Composition, main load valve group 4 is composed in series by multistage main branch converter power module 3.
When failure 6 single-end earthed occurs for hybrid high voltage DC breaker, where the hybrid high voltage DC breaker
The protection equipment of system detects abnormal backward hybrid high voltage DC breaker and sends out actuating signal, hybrid HVDC
Breaker receives protection act order, immediately the main locking of load valve group 4, while shifting the transfer branch road transverter in branch road 9
Power model 7 is turned on, after short-circuit current is transferred to transfer branch road 9 completely, the Fast mechanical switch in main through-flow branch road 5
1 is connected to separating brake order, starts non-arc breaking lock, and set up in transfer branch road 9 before the locking of transfer branch road converter power module 7
The insulation that rising can bear necessarily to cut-off overvoltage is opened away from height is born at the two ends of each vacuum interrupter 2 of Fast mechanical switch 1 immediately
Pressure.
In order to realize the dynamic voltage balancing test to hybrid high voltage DC breaker Fast mechanical switch, comprehensive assessment mixing
Formula high voltage DC breaker opens the reliability with shut-off, and The embodiment provides a kind of hybrid HVDC open circuit
Device Fast mechanical switch dynamic voltage balancing test system, its structure are as shown in Fig. 2 for quick in hybrid high voltage DC breaker
The uniformity of each both end voltage of vacuum interrupter 2 of Fast mechanical switch 1 is monitored in mechanical switch breaking course.
It should be noted that it is only the present invention's that failure 6 single-end earthed, which occurs, for above-mentioned hybrid high voltage DC breaker
One embodiment, if system occur DC Line Fault (for example single-end earthed short trouble, it is single-ended to metallic return short trouble, it is double
Pole short trouble etc.) when causing the dc circuit breaker to act, the dynamic test system in following embodiments of the invention can be applied
Observe whether dynamic voltage balancing characteristic of each vacuum interrupter 2 of Fast mechanical switch 1 during separating brake meets requirement.
Dynamic voltage balancing test system provided in an embodiment of the present invention mainly includes multiple RC dividers 12, a plurality of coaxial electrical
The signal processor 14 of cable 13 and one.The high-pressure side of the high-voltage arm of each RC divider 12 is coupled hybrid HVDC open circuit respectively
The high-pressure side of each vacuum interrupter of device Fast mechanical switch, the low-pressure end ground connection electricity of the low-voltage arm of each RC divider 12
Position, for measuring the voltage signal of the high-pressure side of each vacuum interrupter 2 over the ground.
Normally, above-mentioned RC divider 12, coaxial cable 13 quantity with included in Fast mechanical switch 1
The quantity of vacuum interrupter 2 is identical.For example, the quick machine of the hybrid high voltage DC breaker shown in Fig. 1 of the embodiment of the present invention
Comprising 16 vacuum interrupters in tool switch 1, therefore 16 should be also included in dynamic voltage balancing test system provided in an embodiment of the present invention
Individual RC divider and 16 coaxial cables.
The low-pressure end of the high-voltage arm of each RC divider 12 and high-pressure side difference each coaxial electrical of equipotential bonding of low-voltage arm
One end of cable 13, the other end of coaxial cable 13 is connected with signal processor 14.Coaxial cable 13 is used for RC divider 12
The high-voltage signal detected is converted into low-voltage signal and is sent to signal processor 14.
Signal processor 14 is used for the high-pressure side pair of the low-voltage signal that transmits according to coaxial cable 13 to each vacuum interrupter 2
Ground voltage carries out difference operation, is born at each moment with to obtain the vacuum interrupter 2 between two adjacent RC dividers 12
Voltage differential signal.
In one embodiment, the frequency response higher limit of RC divider 12 is 10MHz, you can meet what is accurately measured
It is required that.
Normally, the coaxial cable 13 in the embodiment of the present invention selects screened cable, and its one end is connected by coaxial plug
In the metal shielding box for the high-pressure side for connecing the low-voltage arm of RC divider 12, disturbed with reducing caused by spatial electromagnetic wave radiation；Its
The other end is coupled signal processor 14 also by coaxial plug, and the HT waveform signal for RC divider 12 to be detected turns
Change low voltage waveform signal into and be sent in signal processor 14.
In one embodiment, above-mentioned dynamic voltage balancing test system also includes a digital storage oscilloscope 15, the numeral
Storage oscillograph 15 is coupled with signal processor 14, for obtaining the voltage differential signal and showing.Signal processor 14 passes through
The high-pressure side of the low-voltage arm of the client link RC divider 12 of coaxial cable 13 1, the other end is coupled digital storage oscilloscope 15, uses
In the voltage waveform of the high-pressure side of each vacuum interrupter 2 for measuring RC divider 12 over the ground difference fortune is carried out at each moment
Calculate, obtain the voltage signal that the vacuum interrupter 2 between two neighboring RC divider 12 is born at the correspondence moment, and will knot
Fruit is sent on digital storage oscilloscope 15 and shown.Fig. 3 is two vacuum extinctions shown on digital storage oscilloscope 15
The voltage waveform view at the two ends of room 2.In figure 3, abscissa is dc circuit breaker actuation time T (unit is millisecond), indulges and sits
Mark is the oscillogram for the voltage signal that the two ends of each arc-chutes 2 that measurement is obtained are born.Wherein, in T0Moment (shifts branch road 9
The middle locking moment of transfer branch road converter power module 7) before, each vacuum interrupter 2 of Fast mechanical switch 1 is set up and can held
By the insulation for necessarily cut-offfing overvoltage open away from；In T0The locking of transfer branch road converter power module 7 in moment, transfer branch road 9,
Electric current is transferred in power consumption branch road 11 from transfer branch road 9；T0After moment, the two ends of each vacuum interrupter 2 of Fast mechanical switch 1 are opened
Beginning bears high pressure, U1And U2It is the ripple that voltage that two of which vacuum interrupter 2 is born is shown in digital storage oscilloscope 16
Shape.
Signal processor 14 carries out difference operation according to following formula to the high-pressure side voltage-to-ground of each vacuum interrupter 2, to obtain
The magnitude of voltage for taking each vacuum interrupter 2 to be born：
ΔUi+1(t)=Ui+1(t)-Ui(t)
Wherein, Δ Ui+1(t) voltage born for i+1 vacuum interrupter in t；I+1 represents each vacuum interrupter
Sequence number, i be 0 to 15 integer, as i=0, U0(t)=0, as i=15, U16(t) it is U (t) shown in Fig. 1.
Normally, in order to avoid power supply surveys the dynamic voltage balancing test system introduced in electromagnetic interference, the embodiment of the present invention
System also includes isolating transformer 16, and power supply is that digital storage oscilloscope 15 is powered by isolating transformer 16.
The hybrid high voltage DC breaker Fast mechanical switch dynamic voltage balancing test system that the embodiment of the present invention is proposed, profit
The voltage waveform that each two ends of vacuum interrupter 2 are born is observed with digital storage oscilloscope 15, hybrid high pressure can be accurately known
The situation of change of dc circuit breaker Fast mechanical switch each both end voltage of vacuum interrupter 2 in breaking course, realize for
The detection of the dynamic voltage balancing percentage of vacuum interrupter 2, effectively judges the separating brake synchronism and switching synchronization of Fast mechanical switch 1
Whether standard requirement less than 0.2ms and 1.5ms is met respectively, so as to ensure that hybrid high voltage DC breaker Quick mechanical is opened
Close Reliability of Microprocessor.
Apply specific embodiment in the present invention to be set forth the principle and embodiment of the present invention, above example
Explanation be only intended to help to understand the method and its core concept of the present invention；Simultaneously for those of ordinary skill in the art,
According to the thought of the present invention, it will change in specific embodiments and applications, in summary, in this specification
Appearance should not be construed as limiting the invention.
Claims (8)
1. a kind of hybrid high voltage DC breaker Fast mechanical switch dynamic voltage balancing test system, it is characterised in that the system
System includes：Multiple RC dividers, a plurality of coaxial cable and a signal processor；
The high-pressure side of the high-voltage arm of each RC divider is coupled hybrid high voltage DC breaker Fast mechanical switch respectively
The high-pressure side of each vacuum interrupter, the low pressure terminal ground potential of the low-voltage arm of each RC divider, for measuring each vacuum
The voltage signal of the high-pressure side of arc-chutes over the ground；
The low-pressure end of the high-voltage arm of each RC divider and the high-pressure side difference equipotential bonding of low-voltage arm are each described coaxial
One end of cable, the other end of the coaxial cable is connected with the signal processor, for the RC divider to be detected
To high-voltage signal be converted into low-voltage signal and be sent to the signal processor；
The signal processor is used for the low-voltage signal that is transmitted according to the coaxial cable to each vacuum interrupter high-pressure side over the ground
Voltage carries out difference operation, and the voltage born with obtaining the vacuum interrupter between two adjacent RC dividers at each moment is believed
Number.
2. system according to claim 1, it is characterised in that the system also includes a digital storage oscilloscope, with institute
Signal processor connection is stated, for obtaining voltage signal and the display that the vacuum interrupter is born at each moment.
3. system according to claim 2, it is characterised in that the system also includes an isolating transformer, power supply
It is that the digital storage oscilloscope is powered by the isolating transformer.
4. system according to claim 1, it is characterised in that one end of the coaxial cable is coupled institute by coaxial plug
The metal shielding box of the low-voltage arm high-pressure side of RC divider is stated, the other end is coupled the signal transacting also by coaxial plug
Device.
5. the system according to claim 1 or 4, it is characterised in that the coaxial cable is screened cable.
6. system according to claim 1, it is characterised in that the multiple RC divider, the number of a plurality of coaxial cable
Amount is identical with the quantity comprising vacuum interrupter in the Fast mechanical switch.
7. system according to claim 6, it is characterised in that the quantity of the RC divider is 16, described coaxial
The quantity of cable is 16.
8. system according to claim 1, it is characterised in that the frequency response higher limit of the RC divider is
10MHz。
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710384008.6A CN106970322B (en) | 2017-05-26 | 2017-05-26 | Dynamic voltage-equalizing test system for quick mechanical switch of hybrid high-voltage direct-current circuit breaker |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710384008.6A CN106970322B (en) | 2017-05-26 | 2017-05-26 | Dynamic voltage-equalizing test system for quick mechanical switch of hybrid high-voltage direct-current circuit breaker |
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| CN106970322B CN106970322B (en) | 2023-09-05 |
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| CN107293440A (en) * | 2017-08-14 | 2017-10-24 | 国家电网公司 | The 363kV breakers switched based on rapid repulsion |
| CN107728048A (en) * | 2017-09-05 | 2018-02-23 | 许继电气股份有限公司 | A kind of mixed type high voltage DC breaker pilot system |
| CN108663591A (en) * | 2018-05-18 | 2018-10-16 | 中国电力科学研究院有限公司 | A kind of device and method for verifying the control logic and control sequential of controllable arrester |
| CN108919109A (en) * | 2018-07-10 | 2018-11-30 | 武汉大学 | A kind of multi-break high voltage direct current Fast mechanical switch dynamic voltage balancing simulation experiment method |
| CN109061450A (en) * | 2018-06-19 | 2018-12-21 | 北京平高清大科技发展有限公司 | A kind of hookup of dc circuit breaker mechanical switch |
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| CN108919109B (en) * | 2018-07-10 | 2021-05-18 | 武汉大学 | Dynamic voltage-sharing simulation test method for multi-fracture high-voltage direct-current quick mechanical switch |
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|---|---|
| CN106970322B (en) | 2023-09-05 |
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