CN103560042A - High voltage DC circuit breaker device and method - Google Patents
High voltage DC circuit breaker device and method Download PDFInfo
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- CN103560042A CN103560042A CN201310384749.6A CN201310384749A CN103560042A CN 103560042 A CN103560042 A CN 103560042A CN 201310384749 A CN201310384749 A CN 201310384749A CN 103560042 A CN103560042 A CN 103560042A
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- circuit
- breaker
- current
- electric current
- cutout
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Abstract
The invention provides a DC circuit breaker device used for breaking the current in a transmission line or a high voltage DC circuit. The DC circuit breaker device comprises n DC breakers in parallel connection which is in series connection with the transmission line. A reactor is connected to each DC circuit breaker. Through the device and the method, a DC circuit breaker device capable of processing very large current is provided. The invention also relates to the corresponding method.
Description
The present patent application is the dividing an application for the application for a patent for invention that is " high voltage direct current circuit breaker arrangement and method " of " 200880132114.4 ", denomination of invention that be on November 26th, 2008, application number the date of application.
Technical field
Relate generally to electrical power transmission system of the present invention field, and relate to especially the device for interrupting high voltage direct current or high voltage direct current being carried out to the change of current.The invention still further relates to corresponding method.
Background technology
High voltage direct current (HVDC) electric power system comprises protection and the control system that is configured to protection, monitoring and controls the operation of the equipment that forms an electric power system part.Described protection system especially prevents short circuit, overcurrent and overvoltage in the power transmission lines of for example HVDC system etc.
Protection relay spreads all over HVDC system and is used for providing this protection and control.Fault in described protection relay detected transmission and distributed lines is also carried out isolated fault by disconnection and closed circuit circuit breaker.Not always must carry out completely and interrupt, can be instead to carry out the change of current to interchangeable path.In essence, the electric current in the parts in primary current path will stop flowing, but not be interrupted, and be only to change direction.In order to realize this object, used HVDC circuit breaker.
Fig. 1 schematically shows basic traditional direct current (DC) circuit-breaker, and it is also called as DC circuit breaker, and it is along the DC circuit L configuration of carrying direct current I.DC circuit breaker 1 is designed to cut off direct current I or to the direct current I change of current.For this reason, DC circuit breaker 1 comprises alternating current circuit circuit breaker 2, and it is being represented as cutout below, the capacitor 3 that itself and resonance LC branch road 3,4(are connected in series with inductor 4) be connected in parallel.Nonlinear resistor 5 is connected in parallel with LC branch road 3,4, in order to flow through capacitor rather than limit condenser voltage while flowing through cutout 2 at direct current I.Inductor 4 can but must not be physical assemblies, the leakage inductance in circuit can be enough conventionally.
Below, conventional interrupt procedure is described.Once interrupt or cut off direct current I, electric current is carried between the contact of cutout 2 by electric arc, and this arc current I
arcmust be extinguished.Fig. 2 shows the arc current I in cutout 2
arcarc characteristic.For the cutout electric current I that reaches about 5kA
arc, arc voltage/electric current slope is for negative, and this causes the vibration for the continuous increase of LC branch road 3,4.When oscillating current reaches enough large, that is, greatly when equaling direct current I, arc current I
arcreach current zero-crossing point, so electric arc is extinguished and whole direct current process capacitor 3.Then the voltage of capacitor 3 increases until it reaches for example surge grabber of nonlinear resistor 5(fast) knee of curve, nonlinear resistor 5 is configured to the voltage on limiting capacitance device 3.Counter voltage in condenser voltage forming circuit, reduces electric current I until it stops.
Above-mentioned traditional DC circuit-breaker 1 is appropriate for the transmission line or the HVDC circuit direct current I operation that reach about 4-5kA.For larger electric current, in processing, the interruption of just now describing there are two main limiting factors:
The steady-state current ability of cutout is restricted to about 5kA at present.
As shown in Figure 2, arc characteristic is curve, and the part that this curve surpasses specific arc current Iarc loses its negative slope and becomes straight, and this makes it be difficult to have and be large enough to cause arc current I
arcthe vibration of zero crossing.The corresponding direct current I that becomes straight place in characteristic is an Accurate Points not, but in about 4 to 5kA somewhere.
Summary of the invention
An object of the present invention is to provide improved DC circuit-breaker equipment, it can process larger levels of current than existing DC circuit-breaker.
Another object of the present invention is to provide a kind of DC circuit-breaker equipment that can use existing assembly to realize.
These objects and other aspects realize by the DC circuit-breaker equipment limiting in independent claims and method.
According to the present invention, a kind of DC circuit-breaker equipment for the direct current on disrupted circuit is provided, wherein said circuit is understood to be in power transmission lines or the connection line having carried in the HVDC circuit of interrupted direct current.Described DC circuit-breaker equipment comprises along at least the first and second DC circuit breakers of described circuit configuration in parallel, and the electric current of described circuit is cut apart between described at least the first and second DC circuit breakers.
Especially, described DC circuit-breaker equipment comprises a DC circuit breaker, and a DC circuit breaker comprises again the first cutout that is connected to described circuit.A described DC circuit breaker further comprises the first resonance LC branch road and the first nonlinear resistor being connected in parallel with described the first cutout.Described DC circuit-breaker equipment further comprises the two DC circuit breaker identical with a described DC circuit breaker.Therefore, described the 2nd DC circuit breaker comprises the second cutout, the second resonance LC branch road and the second nonlinear resistor being connected in parallel with the second cutout.A DC circuit breaker on described the 2nd DC circuit breaker and described circuit is connected in parallel, and being wherein connected in parallel of the first and second DC circuit breakers is connected in series with described circuit.Described direct current is cut apart between the first and second DC circuit breakers.By introducing, electric current is divided into two or more branch roads, each branch road carries a part for described electric current, and the steady-state current in each cutout is halved or reduces manyly.Further, in each cutout, interrupted electric current be halved equally or reduce manyly.By the present invention, a kind of DC circuit-breaker equipment is provided, it can be processed and reach 10kA or larger direct current.The traditional components that described DC circuit-breaker equipment can be easy to obtain by use is manufactured, and makes described DC circuit-breaker equipment have cost benefit and be easy to manufacture.The DC circuit-breaker equipment using in a kind of application of the ability that has surpassed existing DC circuit breaker at specified direct current or the electric current during overload is provided.
According to one embodiment of present invention, comprise the device that keeps the electric current of expectation to cut apart for the interruption processing at described at least the first and second DC circuit breakers.The most reliable DC circuit-breaker equipment is provided thus, and first wherein said circuit-breaker interrupts the risk of its electric current while not existing whole electric current changes of current to another circuit-breaker.
According to one embodiment of present invention, for processing and keep the described device that described electric current is cut apart to comprise the two-winding transformer that is connected to the first and second DC circuit breakers in described interruption.Therefore, the present invention can use traditional components to realize, and makes it possible to provide have cost-benefit scheme.
According to another embodiment of the invention, provide the 3rd DC circuit breaker, on itself and transmission line or the first and second DC circuit breakers in HVDC circuit be connected in parallel.Therefore, electric current is cut apart and the DC circuit-breaker equipment that can process larger electric current is provided thus between three branch roads.Sort circuit breaker apparatus is enough for the application of all types of high voltage direct current (HVDC) network.
According to another embodiment of the invention, for processing and enable the transformer that maintained electric current assigned unit comprises three Z-shaped connections (zigzag connection) in the interruption with three branch roads, described transformer is connected to first, second, and third DC circuit breaker.In addition, the present invention can use traditional components to realize, and this makes it possible to provide has cost-benefit scheme.
The invention still further relates to a kind of corresponding method, obtain thus advantage similar to the above.
According to the reading to following explanation, further embodiment and advantage thereof will become clear.
Accompanying drawing explanation
Fig. 1 shows basic traditional DC circuit-breaker.
Fig. 2 shows the arc characteristic as the alternating current circuit circuit breaker of the cutout in DC circuit-breaker.
Fig. 3 shows according to the first embodiment of DC circuit-breaker equipment of the present invention.
Fig. 4 shows according to the second embodiment of DC circuit-breaker equipment of the present invention.
Fig. 5 shows the step of the method according to this invention.
Embodiment
Fig. 1 and Fig. 2 have been described and all in accompanying drawing, have used identical reference marker to represent identical or corresponding parts.
Fig. 3 shows the first embodiment of the present invention.According to DC circuit-breaker equipment of the present invention, be below represented as DC circuit-breaker equipment 6, the circuit L by equipment for edge carrying DC electric current I connects, and connects with circuit L.Circuit L can be power transmission lines or the connection line in HVDC circuit.
According to the present invention, the direct current I of circuit L is split into two branch road B1 and B2.Described two branch road B1 and B2 are identical, and each branch road comprises DC circuit breaker 1
1, 1
2, described DC circuit breaker comprises again in conjunction with the first or second cutout 2 separately described in Fig. 1
1, 2
2.The first or the 2nd LC branch road 3 separately
1, 4
1with 3
2, 4
2with the first or second cutout 2 separately
1, 2
2be connected in parallel.Further, the first and second nonlinear resistors 5
1, 5
2with the first or the 2nd LC branch road 3 separately
1, 4
1with 3
2, 4
2be connected in parallel.Thus, half of each branch road B1, B2 the line is busy electric current I.
Simply direct current I being divided into two paths can not solve above-mentioned problem and the caused difficulty that realizes current interruptions that loses negative current/voltage slope (see figure 2) under large electric current and still exist.More specifically, if direct current I is divided in two branch road B1, B2 simply, when a cutout is the first cutout 2
1or second cutout 2
2its electric current is cut off in success, and another cutout is still in the processing in extinguishing its electric arc time, all electric currents by the change of current in another branch road.Can not interruptive current after another branch road.If electric current is divided in more current paths simply, be suitable for identical situation.
Therefore, in order to keep the electric current of expectation to cut apart in interrupting processing, two-winding transformer T1 used according to the invention.When the first and second cutouts 2
1with 2
2in one while successfully interrupting its electric current, the magnetization impedance of two-winding transformer T1 stops distributes the inhomogeneous electric current occurring in above-mentioned situation.
Thus, according to the DC circuit-breaker equipment 6 of the first embodiment of the present invention, comprise two traditional DC circuit breakers 1 that are connected in parallel
1with 1
2, described traditional DC circuit breaker 1
1with 1
2be connected to two-winding transformer T1, be connected to the single-phase two-winding transformer of the coil that comprises armature winding and secondary winding or be wound around around single magnetic core.Especially, DC circuit breaker 1
1with 1
2in a polar end that is connected to a winding of transformer T1, and another DC circuit breaker is connected to the non-polar end of another winding of transformer T1.Winding polarity in the accompanying drawings filling point in a conventional manner shows.During steady state operation, the electric current of winding is by the magnetic flux compensating in magnetic core each other.Thus, can utilize traditional assembly, provide and there is cost-benefit DC circuit-breaker equipment.
In the time will interrupting direct current I, DC circuit breaker 1
1, 1
2work in a conventional manner, as described in the application's preface part.DC circuit breaker 1
1, 1
2in one will in current interruptions is processed, first complete.First the DC circuit breaker completing is represented as x and its electric current by its capacitor being associated 3 of flowing through
x.DC circuit breaker 1
xthe voltage at two ends is shifted to another branch road by attempting by the electric current in branch road Bx by increase and this voltage, and another branch road does not also have counter voltage.Yet the magnetization impedance of transformer T1 is avoided the generation of this situation.
Fig. 4 shows the second embodiment of the present invention.According in the DC circuit-breaker equipment 6 ' of the present embodiment, direct current I is split in three branch road B1, B2 and B3, and each branch road carries 1/3rd of direct current I thus during steady state operation.Each branch road B1, B2, B3 comprise the corresponding DC circuit breaker 1 with foregoing layout
1, 1
2, 1
3.
In order to keep described electric current to distribute, three traditional transformer T1, T2, T3 are provided in current interruptions is processed.Transformer T1, T2, T3 connect and are connected and have polarity as shown in Figure 4 with zigzag.For the particular case with three branch roads, this transformer connects and is also called as Z-shaped connection, and can realize with the transformer of the Z-shaped connection of three-phase.
Especially, the non-polar end of a coil on each transformer is connected to the non-polar end of a coil in another transformer.Alternatively, connection can be the polar end that the polar end of a coil on each transformer is connected to a coil of another transformer.During steady state operation, by contrary electric current, the magnetic flux of the first and second coil windings in each transformer will compensate for mutually.
With according to the mode of the first embodiment of the present invention, the mutual inductance of transformer is for keeping described electric current to distribute interrupting processing.
Once all branches B1, B2, B3 arrive its corresponding capacitor 3 by its corresponding electric current change of current
1, 3
2, 3
3or its corresponding nonlinear resistor 5
1, 5
2, 5
3, because whole derivative branch roads of electric currents will be in equidirectional, so the leakage inductance of transformer will be added in the inductance of way circuit.Yet the leakage inductance of transformer (being also called short-circuit impedance) is very low, lower several thousand times than magnetizing inductance, and can be left in the basket.
Principle of the present invention can be applied to n branch road B1, B2 of any amount in the corresponding way ..., Bn.Thus, can design DC circuit-breaker equipment 6
n-1and be applicable to each concrete application.Yet, above-mentioned enough overwhelming majority's application for predicting in the near future of DC circuit-breaker equipment 6 ' with three branch road B1, B2, B3.Note, apply principle of the present invention, example is not if process two DC circuit breakers that are connected in parallel of the electric current that reaches 5kA, but can use a plurality of having more cost-benefitly can process for example DC circuit-breaker of 500A of lower electric current.
In the above description, utilized n transformer of right quantity so that at cutout 2
1, 2
2..., 2
ninterruption keep electric current to distribute in processing.Yet, can replace with other devices that use the electric current for keeping between different branch to distribute.
For example, can alternatively use the device that only comprises the reactor that does not rely on above-mentioned mutual inductance.Yet, must consider following true: even if at intercourse for keeping electric current to distribute needed very large inductance all to complete the electric current change of current is still retained in circuit after its capacitor separately or nonlinear resistor at the cutout of all branches.
As shown in Figure 5, the present invention also provides a kind of for interrupting or method 10 to the direct current I change of current on transmission line L or HVDC circuit.Described method 10 comprises first step 11: direct current I is divided in two or more branch roads B1, B2, B3.Second step 12 comprises the DC circuit breaker 1 at each corresponding branch road B1, B2, B3 place by stimulation arrangement
1, 1
2, 1
3and interrupting direct current I, the intercourse at direct current I keeps described electric current to cut apart by transformer equipment simultaneously.DC circuit breaker 1
1, 1
2, 1
3configuration as previously mentioned, transformer equipment configures equally as previously mentioned,, if electric current is split in two branch roads, described transformer equipment is a single-phase two-winding transformer T1, if or electric current be split in three branch roads, described transformer equipment is three two-winding transformer T1, T2, T3, by that analogy, until n two-winding transformer T1, T2, T3 ..., Tn to be to be divided into electric current in n branch road.
In a word, the invention provides for allowing DC circuit breaker by conjunction with traditional to interrupt to be greater than 5kA and the device of 10kA or larger direct current the most advantageously, traditional DC circuit breaker has can process the cutout that reaches about 5kA.Therefore, the application that the present invention surpasses 5kA for electric current is favourable, no matter this electric current is rated current or the electric current under overload.By electric current being assigned in two or more branch roads, each branch road carries half or direct current I still less, and the steady-state current in each cutout is halved or is even lower.Further, the interrupted electric current electric current of vibration (or will occur) is halved or lower.Further, in the mode of innovating, promote the uniform current of stable state and transient state to distribute.
Claims (4)
1. a DC circuit-breaker equipment (6 '), the direct current (I) on disrupted circuit (L), comprising:
-n DC circuit-breaker (1 being connected in parallel
1, 1
2, 1
3), n>2 wherein, is connected in parallel described in DC circuit-breaker and is connected in series with described circuit (L), and the described direct current (I) of described circuit (L) is at described n DC circuit-breaker (1
1, 1
2, 1
3) between cut apart, and
-n reactor, each reactor is connected to described DC circuit-breaker (1
1, 1
2, 1
3) in one, for keeping described electric current to cut apart during current interruptions.
2. DC circuit-breaker equipment according to claim 1 (6 '), wherein each:
-DC circuit-breaker (1
1, 1
2, 1
3) comprise cutout (2
1, 2
2, 2
3) and with described cutout (2
1, 2
2, 2
3) the resonance LC branch road (3 that is connected in parallel
1, 3
2, 3
3, 4
1, 4
2, 4
3) and nonlinear resistor (5
1, 5
2, 5
3).
3. according to DC circuit-breaker equipment in any one of the preceding claims wherein (6 '), wherein, described circuit (L) is high pressure DC transmission line or a part for hvdc circuit.
4. for interrupting or change of current transmission line (L) is upper or a method for the direct current (I) of hvdc circuit, comprise the steps:
-described tributary (I) is divided in n branch road (B1, B2, B3), n>2 wherein,
-the cutout (1 located at each branch road (B1, B2, B3) by stimulation arrangement
1, 1
2, 1
3) and interrupt described direct current (I), during described current interruptions, by n reactor, keep described electric current to cut apart simultaneously, each reactor is connected to described cutout (1
1, 1
2, 1
3) in one.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310384749.6A CN103560042A (en) | 2008-11-26 | 2008-11-26 | High voltage DC circuit breaker device and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310384749.6A CN103560042A (en) | 2008-11-26 | 2008-11-26 | High voltage DC circuit breaker device and method |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200880132114.4A Division CN102227796B (en) | 2008-11-26 | 2008-11-26 | High voltage direct current circuit breaker arrangement and method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103560042A true CN103560042A (en) | 2014-02-05 |
Family
ID=50014260
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310384749.6A Pending CN103560042A (en) | 2008-11-26 | 2008-11-26 | High voltage DC circuit breaker device and method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103560042A (en) |
-
2008
- 2008-11-26 CN CN201310384749.6A patent/CN103560042A/en active Pending
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Application publication date: 20140205 |