CN108711838A - A kind of fast failure current limiter - Google Patents
A kind of fast failure current limiter Download PDFInfo
- Publication number
- CN108711838A CN108711838A CN201810341045.3A CN201810341045A CN108711838A CN 108711838 A CN108711838 A CN 108711838A CN 201810341045 A CN201810341045 A CN 201810341045A CN 108711838 A CN108711838 A CN 108711838A
- Authority
- CN
- China
- Prior art keywords
- current
- mechanical switch
- circuit
- reactor
- current limiter
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
- H01H9/30—Means for extinguishing or preventing arc between current-carrying parts
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/02—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess current
- H02H9/028—Current limitation by detuning a series resonant circuit
Abstract
The present invention provides a kind of fast failure current limiter, including current-limiting reactor, ultrahigh speed mechanical switch, on-off control system, capacitor, the compositions such as arrester, current transformer, insulation cabinet.Wherein main controller controls ultrahigh speed mechanical switch divide-shut brake, when line current is in stable state, ultrahigh speed mechanical switch disconnects, and current-limiting apparatus is in externally Low ESR；When short trouble or overcurrent occur for circuit, on-off control system detects that line current is more than threshold value, high speed disconnects ultrahigh speed mechanical switch, Fault Current Limiting Device is in externally high impedance, realize the effect for effectively inhibiting short circuit current, when circuit and in first major loop zero crossing high speed closure switch of electric current, circuit restores normal operation.
Description
Technical field
The present invention relates to for high-voltage appliance switch apparatus field, more particularly, to a kind of fast failure current limiter.The limit
Automatic quick current-limiting when short trouble or overcurrent occur suitable for electric system and tractive power supply system for device is flowed to handle.
Background technology
With the rapid development of the national economy, high voltage large capcity power supply system has obtained further development, system short-circuit
Levels of current is also being continuously improved, when power failure occurs for power system transformer substation or traction substation exit, most
Big short circuit current is up to 100kA or more, and the drop-out current of domestic more common vacuum circuit breaker is 63kA hereinafter, at present
Considerably beyond the breaking capability of breaker, there is larger security risks.It, can be right if short circuit current is not limited in time
A power equipment on transformer and circuit causes to impact, and power equipment can be caused to cannot stand the big of first cycle when serious
Rush of current and damage.Therefore, as the effective measures for inhibiting short circuit current in electric system, the development of fault current limiter is ten
Point it is necessary to, be the important equipment in the increasingly mature electric system of development.From the point of view of the development course of fault current limiter,
The basic principle of various current limiters is roughly the same, is all in power supply system normal operation, and current limiter is in Low ESR, when circuit is sent out
Quickly current-limiting impedance is put into operation into circuit when raw short circuit, inhibits the growth that is exceedingly fast of short circuit current, mitigates the burden of power equipment.Mesh
The fault current limiter of preceding domestic and international mainstream can be roughly divided into：The superconductive failure current limiter of based superconductive material is based on power electronics
The solid-state current limiter of device and series resonance-type fault current limiter and mechanical switch-type fault current limiter.The structure of current limiter
Although type is various, its major function is required consistent：It will not lead to system overvoltage, overcurrent or oscillation etc. when running
Adverse effect；Have the function of detecting and automatically reset after automatic trigger and troubleshooting after failure；Breaker acting speed is fast, in time
Inhibit electric current etc..Superconduction type current limiter is immature due to its high cost and technology, is not appropriate for large-scale promotion at present
Using；Solid-state current limiter and series resonance-type current limiter are the main hot spots developed at present, but solid-state current limiter its solid-state switch
Resistance to pressure it is poor, and on-state loss is higher, and there is cost is higher and the fortune of control system for series resonance-type fault current limiter
Dimension problem, and mechanical switch-type fault current limiter also have the switch motion time it is longer the problems such as.
Invention content
In view of the above, the present invention is directed to propose a kind of fast failure current limiter, can solve or avoid the above problem.
To achieve the above object, technical scheme is as follows：
A kind of fast failure current limiter is provided, including：First reactor L1, the second reactor L2, ultrahigh speed mechanical switch,
On-off control system, capacitor C, arrester, current transformer, insulation cabinet.
The master controller uses FPGA for main logic unit, being capable of the circuit that detects of real-time reception current transformer
In current amplitude and phase information, and be pocessed judgement, disconnect Fast mechanical switch when breaking down in time.
Further, the switch triggering unit of ultrahigh speed mechanical switch mainly discharges power supply group by energy-storage units and energy storage
At the high-speed breaking of mechanical switch may be implemented.
Further, the function of overvoltage protection may be implemented in the arrester in fault current limiter, ensures the steady of current-limiting apparatus
Fixed operation.
A kind of fast failure current limiter proposed by the invention, suitable for electric system and tractive power supply system.Normally
When operation, high-speed switch is off, and the first reactor L1 constitutes series resonance with capacitor C, and current limiter shows as low
Impedance；When circuit occur short circuit when, master controller is broken down by current transformer decision circuitry, and send control signal make
Ultrahigh speed mechanical switch quick-make, the second reactor L2 and capacitor C constitute parallel resonance, and current limiter is in externally high impedance,
Short circuit current is quickly restrained.In first major loop zero crossing of electric current, ultrahigh speed mechanical switch disconnects rapidly, and circuit is extensive
Multiple normal operation, is effectively protected transformer, the power equipments such as breaker.
The beneficial effects of the invention are as follows：(1) current limiter passes through the limit that puts into operation at a high speed when line short or overcurrent occurs
Reactor is flowed, current limitation effect is apparent, and according to live actual test, current limitation effect can reach 40% or more.(2) height of the current limiter
Fast mechanical switch is powered using large capacity energy-storage units, and is controlled it by High-speed on-off control system and is cut-off, and is ensureing that machinery opens
While closing its higher pressure-resistant performance, the response speed of switch is also substantially increased, there is higher reliability and controllability.
Description of the drawings
Fig. 1 is the circuit diagram of a specific embodiment of the invention；
The mark of each component is described as follows in attached drawing：
The first reactors of 101- L1；The second reactors of 102- L2
103- ultrahigh speed mechanical switch；104- capacitors C
105- on-off control systems；106- current transformers
107- arresters；108- insulation cabinets
Specific implementation mode
The present invention is further elaborated with embodiment below in conjunction with the accompanying drawings, so that advantages and features of the invention are easier to
It is readily appreciated by one skilled in the art.
As shown in Figure 1, a kind of fast failure current limiter, including the first reactor L1 (101), the second reactor L2 (102),
Ultrahigh speed mechanical switch (103), capacitor C (104), on-off control system (105), current transformer (106), arrester
(107), insulation cabinet (108).
The fault current limiter has three branches in parallel, wherein a branch is equipped with capacitor C, a branch road is set
There are arrester, a branch road to be equipped with ultrahigh speed mechanical switch and the second reactor L2；First reactor L1 branch in parallel with three
It connects on road；The current transformer is connected to the side of three parallel branches, and is connected with on-off control system.
Further, when ultrahigh speed mechanical switch, which is in, to be disconnected, the first reactor L1 connects with capacitor C compositions at this time
Resonance, current-limiting apparatus are in externally Low ESR；When ultrahigh speed mechanical switch, which is in, to be closed, the second reactor L2 and capacitor at this time
C constitutes parallel resonance, and current-limiting apparatus is in externally high impedance at this time.
Further, ultrahigh speed mechanical switch has a vacuum interrupter, and the vacuum insulation characteristic of vacuum interrupter can be
When mechanical switch quick acting switching-off, extinguish electric arc rapidly, avoids result in switch OFF failure.
A kind of specific workflow of fast failure current limiter of the present invention is：
In circuit normal operation, ultrahigh speed mechanical switch remains open, and current limiter is in externally Low ESR；
When master controller receives the overcurrent signal that current transformer is sent out, master controller detects that current amplitude reaches
When to predetermined threshold value, judge that short trouble occurs for circuit, and control ultrahigh speed mechanical switch high speed and be closed, current-limiting reactor is thrown
Fortune.Through live actual test, current limitation effect is up to 40% or more.
The foregoing is merely presently preferred embodiments of the present invention, the scope of the claims being not intended to restrict the invention, every utilization
Equivalent structure or equivalent flow shift made by the basis of technical scheme of the present invention should all be included in the patent protection of the present invention
In range.
Claims (4)
1. a kind of fast failure current limiter, which is characterized in that including the first reactor L1, the second reactor L2, ultrahigh speed machinery
Switch, on-off control system, capacitor C, arrester, current transformer, insulation cabinet；The fast failure current limiter has three
The branch of item parallel connection, wherein a branch is equipped with capacitor C, a branch road is equipped with arrester, and a branch road is equipped with superelevation
Fast mechanical switch and the second reactor L2；First reactor L1 connects with three parallel branches.
2. a kind of fast failure current limiter according to claim 1, it is characterised in that：When circuit stable operation, superelevation
Fast mechanical switch disconnects, and the first reactor L1 and capacitor C constitutes series resonance at this time, is in externally Low ESR.
3. a kind of fast failure current limiter according to claim 1, it is characterised in that：When there is short trouble in circuit,
Ultrahigh speed mechanical switch is closed, and the second reactor L2 and capacitor C constitutes parallel resonance at this time, is in externally high impedance, is effectively pressed down
The growth of short circuit current processed.
4. a kind of fast failure current limiter according to claim 1, it is characterised in that：On-off control system can connect in real time
Receive the current amplitude and phase information in the circuit that detects of current transformer, and be pocessed judgement, when breaking down and
When put into operation reactor, and disconnect mechanical switch rapidly in first major loop zero crossing of electric current, circuit restores normal operation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810341045.3A CN108711838A (en) | 2018-04-08 | 2018-04-08 | A kind of fast failure current limiter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810341045.3A CN108711838A (en) | 2018-04-08 | 2018-04-08 | A kind of fast failure current limiter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108711838A true CN108711838A (en) | 2018-10-26 |
Family
ID=63866669
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810341045.3A Pending CN108711838A (en) | 2018-04-08 | 2018-04-08 | A kind of fast failure current limiter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108711838A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110445116A (en) * | 2019-08-13 | 2019-11-12 | 湖南大学 | Aerial drainage control circuit and device |
| CN110460023A (en) * | 2019-08-13 | 2019-11-15 | 湖南大学 | The method of controlling switch of discharge device |
-
2018
- 2018-04-08 CN CN201810341045.3A patent/CN108711838A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110445116A (en) * | 2019-08-13 | 2019-11-12 | 湖南大学 | Aerial drainage control circuit and device |
| CN110460023A (en) * | 2019-08-13 | 2019-11-15 | 湖南大学 | The method of controlling switch of discharge device |
| CN110460023B (en) * | 2019-08-13 | 2020-11-06 | 湖南大学 | Switch control method of drainage device |
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| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20181026 |