CN207572960U - A kind of high voltage DC breaker with saturable reactor - Google Patents
A kind of high voltage DC breaker with saturable reactor Download PDFInfo
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- CN207572960U CN207572960U CN201721631300.5U CN201721631300U CN207572960U CN 207572960 U CN207572960 U CN 207572960U CN 201721631300 U CN201721631300 U CN 201721631300U CN 207572960 U CN207572960 U CN 207572960U
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Abstract
The utility model provides a kind of dc circuit breaker with saturable reactor, including：Main loop unit, charging convertor unit, energy-absorbing compression limiter and trigger element.Main loop unit is in series with saturable reactor by mechanical switch, and when cut-offfing fault current, saturable reactor can reduce the current reduction ratio before mechanical switch current zero-crossing point；Charging convertor unit by mutual reactor and therewith primary side series connection trigger switch, recharged capacitance and therewith secondary connect commutation capacitor form, provide reversed high-frequency current for main loop unit so as to generate artificial zero crossing；Energy-absorbing compression limiter is Zinc-Oxide Arrester, limits the both end voltage of main loop unit；Triggering charging convertor unit turns it on after trigger element is used for failure.High voltage DC breaker provided by the utility model with saturable reactor can realize that the two-way of fault current is cut-off, and prior fault current reduction ratio is cut-off in reduction, cut-off reliability height, can reduce capacity needed for capacitor, low cost.
Description
Technical field
The utility model belongs to high voltage DC breaker field, more particularly, to a kind of high pressure with saturable reactor
Dc circuit breaker.
Background technology
Due to the continuous increasing of the shortage of traditional fossil energy, the aggravation of problem of environmental pollution and user to electrical energy demands
It is long so that the exploitation of regenerative resource clean energy resource rapidly develops.In order to economically obtain remote regenerative resource for example
Wind energy and solar energy, based on low-loss, remote, bulk power transmission and more effectively connection regenerative resource networks and is convenient for
The advantages of flexible operating, D.C. high voltage transmission have obtained new attention.
Traditional DC transmission engineering is mostly two end systems, is only capable of realizing the energy transmission between 2 points, when using direct current
When transmitting electricity between multiple load center power transmissions or multiple AC systems using direct current interconnection, need to build a plurality of DC transmission line
Road, this will greatly increase cost of investment and operating cost.And multi-terminal direct current transmission system fully develops D.C. high voltage transmission
The economical advantage and technological merit of technology are a kind of technology of transmission of electricitys of more attractive, meet the development need of China's power industry
It will.Other than having the advantages of two-terminal DC transmission system, multi-terminal HVDC transmission, which also has, can be achieved multiple feed, more drop points by electricity；
Reliable higher, it is more flexible；It can be with built by separate periods, the advantages that increasing investment returns.
The technical significant challenge of multi-terminal high-voltage DC grid at present, as the topology design of network structure, large-sized cable,
It protects and the dc circuit breaker that cut-offs short circuit current etc. becomes hot issue.For multi-terminal high-voltage DC grid, have and quickly open
Disconnected direct fault current and the dc circuit breaker of isolated fault function are essential and vital.Due to lacking practicality
High voltage DC breaker when ground short circuit occurs for metallic(return) circuit when more serious failure, can only disconnect exchange side breaker,
Achieve the purpose that relay protection, such that the influence area of failure is significantly expanded, greatly reduce multi-terminal HVDC transmission system
The reliability of system and flexibility.Only using high voltage DC breaker, be possible to realize multiple sections using multi-terminal high-voltage direct current
The regenerative resource networking of point connection or logout, timely quick separating failure can simultaneously ensure the safe and reliable operation of system.Therefore
The high voltage DC breaker suitable for DC transmission system is developed, particularly important is become for development flexible DC power transmission net, it is right
The reliability and flexibility for improving DC transmission system are of great significance.
Dc circuit breaker is broadly divided into three types at present：Mechanical dc circuit breaker, all solid state formula dc circuit breaker and
Hybrid dc circuit breaker.Tradition machinery formula high voltage DC breaker commutation circuit is complicated, and required condenser capacity is big, body
Product is big；Hybrid high voltage DC breaker on-state loss is big, involves great expense, high to control requirement；All solid state formula high voltage direct current is broken
The cost of road device is high and on-state loss is big.
Utility model content
For the disadvantages described above or Improvement requirement of the prior art, the utility model provides a kind of height with saturable reactor
Press dc circuit breaker, its object is to solve existing high voltage DC breaker when disconnecting fault current due to fault current under
The technical issues of drop rate causes greatly mechanical switch that can not disconnect.
To achieve the above object, according to the one side of the utility model, a kind of high pressure with saturable reactor is provided
Dc circuit breaker, including：
Main loop unit, including mechanical switch and saturable reactor connected in series, both ends are used for and electric system
Connection, mechanical switch realization is switched on and off circuit in electric system, saturable reactor realize current zero-crossing point it
Before slow down the fall off rate for flowing through mechanical switch electric current；
Charge convertor unit, and both ends are in parallel with the both ends of main loop unit, generation and failure when electric power system fault
The reversing oscillating current of electric current makes the electric current for flowing through mechanical switch zero crossing occur；
Trigger element, output terminal connect with the control terminal for the convertor unit that charges, are connected when electric system is broken down
Charge convertor unit；
Preferably, the dc circuit breaker further includes：The both ends of energy-absorbing compression limiter, both ends and main loop unit are simultaneously
Connection absorbs the energy that inductive element stores in electric system after mechanical switch disconnects.
Preferably, charging convertor unit includes：Recharged capacitance, commutation circuit capacitance, mutual reactor, thyristor and
Diode in parallel therewith；
The mutual reactor primary side winding and the recharged capacitance and the Thyristors in series；The coupling reactance
Device vice-side winding is connected with the commutation circuit capacitance.
Preferably, the energy-absorbing compression limiter is arrester.
In general, it can obtain down the above technical solutions conceived by the present invention are compared with the prior art,
Row advantageous effect：
(1) it is enough to form current zero-crossing point in the process to ensure to cut-off high current, it is necessary to improve pre-charge pressure to increase
High frequency oscillating current peak value, and according to practical loop resistance generate attenuation reserve adequate allowance, with ensure high-current on-off into
Work(.But the raising of high frequency oscillating current peak value is easy to cause when cut-offfing specified low current and is opened due to failure current reduction ratio is excessive
Disconnected failure, and in main loop unit after series transductor L3, before fault current zero crossing, saturable reactor L3
Be operated in unsaturated region, inductance value is larger, can fault current limiting rate of descent within the scope of connecting-disconnecting function, improve out
Disconnected reliability；While the rate of descent for reducing fault current, the capacity of pre-charge capacitor can also be reduced, so as to reduce
Cost.
(2) mechanical switch CB is connected with saturable reactor L3 in access system in main loop unit, works as system jam
When, in fault current ascent stage, saturable reactor is operated in unsaturated region, and inductance value is larger, so as to can inhibit direct current event
Hinder the climbing of electric current, reduce requirement of the system to breakdown judge sensitivity, while also reduce fault current to system
Impact.
(3) high voltage DC breaker has the two-way ability for cut-offfing specified low current and intereelectrode short-circuit high current, adopts
The high pressure trigger switch of change of current branch in conventional topologies is transferred to low-pressure side with mutual reactor, significantly reduces trigger switch electricity
Grade is pressed, so as to which available thyristor replaces；Trigger switch reduces drive control difficulty without insulation against ground requirement.It is pre-charged simultaneously
Capacitance is located at low-pressure side, and pre-charge pressure is relatively low, significantly reduces the voltage class of capacitance and precharge device；Naked will over the ground
It asks, solves high potential, more current potentials charging problem.In addition, capacitor occupies in mechanical dc circuit breaker cost and volume
Larger specific gravity, New Topological is for high pressure lateral capacitance without the through-flow requirement of long-term pressure so that capacitor cost and volume significantly drop
It is low, significantly improve the economy of dc circuit breaker.
Description of the drawings
Fig. 1 is a kind of functional block diagram of the high voltage DC breaker with saturable reactor provided by the utility model；
Fig. 2 is a kind of concrete structure block diagram of the high voltage DC breaker with saturable reactor provided by the utility model；
Fig. 3 is cut-offs oscillogram during fault current without the high voltage DC breaker of saturable reactor；
Fig. 4 is the waveform when high voltage DC breaker provided by the utility model with saturable reactor cut-offs fault current
Figure；
Wherein, 1 is main loop unit, and 2 be the convertor unit that charges, and 3 be energy-absorbing compression limiter, and 4 be trigger element；CB is machine
Tool switchs, and L3 is saturable reactor, and C1 is recharged capacitance, and C2 is commutation circuit capacitance, and SCR is can trigger brilliant lockage chamber, D bis-
Pole pipe, L1 are mutual reactor primary side, and L2 is mutual reactor secondary；X-axis is time t, unit s；Y-axis is current amplitude, single
Position kA；Solid line represents mechanical switch CB fracture electric currents, and dotted line represents mutual reactor secondary current.
Specific embodiment
In order to make the purpose of the utility model, technical solutions and advantages more clearly understood, below in conjunction with attached drawing and implementation
Example, the present invention is further described in detail.It should be appreciated that specific embodiment described herein is only used to explain
The utility model is not used to limit the utility model.In addition, institute in the various embodiments of the present invention described below
The technical characteristic being related to can be combined with each other as long as they do not conflict with each other.
The purpose of this utility model is to provide a kind of high voltage DC breaker with saturable reactor, is meeting straight-flow system
It, can be under fault current limiting on the basis of being swift in motion in itself to high voltage DC breaker, cut-offfing high current and bear high voltage
Drop rate increases the reliability cut-off within the scope of connecting-disconnecting function, can reduce capacity needed for capacitor, reduces the cost of device,
The high voltage DC breaker is two-way simultaneously cut-offs specified low current and intereelectrode short-circuit high current.
Fig. 1 is a kind of functional block diagram of the high voltage DC breaker with saturable reactor provided by the utility model, and Fig. 2 is
A kind of concrete structure block diagram of high voltage DC breaker with saturable reactor provided by the utility model.The utility model provides
A kind of high voltage DC breaker with saturable reactor, including：Main loop unit 1, charging convertor unit 2, energy-absorbing pressure limiting list
Member 3 and trigger element 4；Main loop unit 1 is accessed in electric system, and charging convertor unit 2 and energy-absorbing compression limiter 3 are with leading back
Road unit 1 is connected in parallel；Wherein, main loop unit includes the mechanical switch CB being connected in series with and saturable reactor L3, machinery are opened
Close for can arcing and in current over-zero can blow-out switch.Charge convertor unit include recharged capacitance C1, thyristor SCR,
Diode D, mutual reactor and commutation circuit capacitance C2, thyristor SCR are connected in parallel with diode D, and in mutual reactor
Primary side L1 series connection；Recharged capacitance C1 connects successively with mutual reactor primary side L1 and thyristor SCR；Commutation circuit capacitance
C2 connects with mutual reactor secondary L2.The output terminal of trigger element 4 is connect with the control terminal for the convertor unit that charges, and works as power train
When system breaks down, charging convertor unit is connected for generating trigger signal, generates the oscillating current with fault current direction.
Energy-absorbing compression limiter is Zinc-Oxide Arrester, limits the both end voltage of main loop unit.
In normal conditions, for main loop unit 1 by system nominal current, running wastage is small.Charging convertor unit 2 is used
In generating high frequency reverse current under fault condition, artificially generated current zero-crossing point cut-offs mechanical switch realization.Energy-absorbing pressure limiting
Unit is used for after main loop unit 1 cut-offs fault current, and absorption fault current is cut off inductive element in rear electric system and deposits
The energy of storage realizes the voltage-limiting protection to the mechanical switch；The trigger element is in parallel with the charging convertor unit, uses
The charging convertor unit is triggered after failure to turn it on.
In the utility model embodiment, the major function of main loop unit is to be opened by mechanical switch CB in current zero-crossing point
Disconnected fault current, saturable reactor fault current limiting rate of descent before the current zero crossing；The main work(of charging convertor unit
Can be that high frequency oscillating current is generated by recharged capacitance C1 and mutual reactor L1, oscillating current amplitude is more than system failure electric current
Amplitude, the artificial current zero-crossing point that manufactures cut-off mechanical switch CB；The major function of energy-absorbing compression limiter is for absorbing failure
Electric current is cut off the energy that inductive element stores in rear electric system to realize the voltage-limiting protection to mechanical switch CB；Trigger element
In parallel with the charging convertor unit, major function is turned it on for triggering charging convertor unit after the system failure.
It is as follows that its course of work is now described in detail：
When the systems are operating normally, mechanical switch CB is closed, and system power flows through mechanical switch CB and saturable reactor L3,
Saturable reactor L3 is operated in zone of saturation at this time, and inductance value is small, and on-state loss is smaller.When system occur short trouble, by
When only having current over-zero connecting-disconnecting function in the used unit that cut-offs, therefore cut-offfing fault current, the contact of mechanical switch CB
It separates and arcing, mechanical switch CB, which reaches, effectively to be opened away from rear, and trigger element 4 sends out signal triggering thyristor SCR, and conducting charging is changed
Unit 2 is flowed, recharged capacitance C1 and mutual reactor primary side L1 vibrates, and generates high frequency oscillating current, so as to mutual reactor pair
Side L2 and commutation circuit capacitance C2 generates reversing oscillating current, and oscillating current amplitude is more than system maximum fault current amplitude,
So as to which mechanical switch CB be made to generate zero crossing and blow-out；The low current stage before fault current zero crossing is cut-off, due to flowing through
The electric current of main loop unit is smaller, and saturable reactor L3 is operated in unsaturated region, and inductance value is larger so that commutation circuit etc.
Imitating frequency reduces, so as to reduce the rate of descent of zero crossing prior fault electric current so that cut-off relatively reliable.
After mechanical switch CB zero passage blow-outs, electric current is transferred to mutual reactor secondary L2 and commutation circuit capacitance C2's
Change of current branch, voltage is gradually increasing, and be applied on mechanical switch CB fractures on commutation circuit capacitance C2, mechanical switch CB both ends
Recovery voltage rise, when reaching energy-absorbing unit operation voltage, energy-absorbing compression limiter acts and absorbs fault current and is cut off
The energy that inductive element stores in electric system afterwards realizes the voltage-limiting protection to the mechanical switch, completes opening for fault current
It is disconnected.
When short trouble occurs for system, flowing through the electric current of mechanical switch CB and saturable reactor will rise rapidly, by
In saturable reactor be inductive element, it will in the climbing of fault current limiting to a certain degree, thus reduce system pair therefore
Barrier judges the requirement of sensitivity, while also reduces impact of the fault current to system.Meanwhile mechanical switch CB is opened and is fired
Arc reaches switchable in the distance of mechanical switch contact and effectively opens away from later, and trigger element sends out signal, triggers thyristor
SCR is connected, and so as to which recharged capacitance C1 and mutual reactor primary side L1 oscillations generate reversed high frequency oscillating current, is superimposed upon and leads back
An artificially generated zero crossing on the unit of road so that mechanical switch blow-out.The recovery voltage at mechanical switch CB both ends after blow-out
Rise, when reaching energy-absorbing compression limiter operation voltage, the energy in energy-absorbing compression limiter action absorption system in inductive element,
Complete cut-offfing for fault current.
During fault current is cut-off, saturable reactor never will be transferred to saturation workspace by saturation operation region
Domain, inductance value will significantly increase, and so as to limit the fault current rate of descent before current zero-crossing point, ensure that is cut-off
Reliability；Simultaneously as the reduction of fault current rate of descent, the capacity of required capacitor can also decrease, this will effectively
Reduce the manufacture cost of breaker.
Fig. 3 is current waveform figure when cut-offfing 25kA high currents without the high voltage DC breaker of saturable reactor, and Fig. 4 is
High voltage DC breaker provided by the utility model with saturable reactor cut-offs current waveform figure during 25kA high currents,
Middle x-axis is time t, unit s；Y-axis is current amplitude, unit kA；Solid line represents mechanical switch CB fracture electric currents, and dotted line represents coupling
Close reactor secondary current.When cut-offfing fault current without the high voltage DC breaker of saturable reactor for Fig. 3, mechanical switch
Di/dt before CB fracture current zero-crossing points is about 80A/us, and high voltage DC breakers of the Fig. 4 with saturable reactor cut-offs failure
During electric current, the di/dt before mechanical switch CB fracture current zero-crossing points is about 20A/us, is compared it is found that the height with saturable reactor
Di/dt of pressure dc circuit breaker when cut-offfing fault current before zero crossing, which has, largely to be reduced, this by increase cut-off can
By property and the dosage of capacitor is reduced so as to achieve the purpose that reduce cost.
As it will be easily appreciated by one skilled in the art that the above is only the preferred embodiment of the utility model only, not
To limit the utility model, any modification made within the spirit and principles of the present invention, equivalent replacement and change
Into etc., it should be included within the scope of protection of this utility model.
Claims (4)
1. a kind of high voltage DC breaker with saturable reactor, which is characterized in that including：
Main loop unit (1), including mechanical switch (CB) and saturable reactor connected in series (L3), both ends are used for and electricity
The connection of Force system, mechanical switch realization are switched on and off circuit in electric system, and saturable reactor is realized in electric current mistake
Slow down the fall off rate for flowing through mechanical switch electric current before zero；
Charge convertor unit (2), and both ends are in parallel with the both ends of main loop unit, is generated when electric power system fault and failure electricity
The reverse current of stream makes the electric current for flowing through mechanical switch zero crossing occur；
Trigger element (4), output terminal connect with the control terminal of charging convertor unit (2), are led when electric system is broken down
Logical charging convertor unit (2).
2. dc circuit breaker as described in claim 1, which is characterized in that the dc circuit breaker further includes：Energy-absorbing pressure limiting list
First (3), both ends are in parallel with the both ends of main loop unit, and inductive element in electric system is absorbed after mechanical switch disconnects and is stored
Energy.
3. high voltage DC breaker as claimed in claim 1 or 2, which is characterized in that charging convertor unit (2) includes：Preliminary filling
Capacitance (C1), commutation circuit capacitance (C2), mutual reactor, thyristor (SCR) and diode (D) in parallel therewith；
The mutual reactor primary side winding (L1) is connected with the recharged capacitance (C1) and the thyristor (SCR)；Institute
Mutual reactor vice-side winding (L2) is stated to connect with the commutation circuit capacitance (C2).
4. high voltage DC breaker as claimed in claim 2, which is characterized in that the energy-absorbing compression limiter (3) is arrester.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721631300.5U CN207572960U (en) | 2017-11-29 | 2017-11-29 | A kind of high voltage DC breaker with saturable reactor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721631300.5U CN207572960U (en) | 2017-11-29 | 2017-11-29 | A kind of high voltage DC breaker with saturable reactor |
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| Publication Number | Publication Date |
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| CN207572960U true CN207572960U (en) | 2018-07-03 |
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| CN201721631300.5U Expired - Fee Related CN207572960U (en) | 2017-11-29 | 2017-11-29 | A kind of high voltage DC breaker with saturable reactor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109545519A (en) * | 2018-11-22 | 2019-03-29 | 济南西电特种变压器有限公司 | A kind of transformer for flexible DC transmission |
-
2017
- 2017-11-29 CN CN201721631300.5U patent/CN207572960U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109545519A (en) * | 2018-11-22 | 2019-03-29 | 济南西电特种变压器有限公司 | A kind of transformer for flexible DC transmission |
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| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180703 Termination date: 20191129 |