CN105932648A - Load security protection device used for direct-current power distribution system - Google Patents
Load security protection device used for direct-current power distribution system Download PDFInfo
- Publication number
- CN105932648A CN105932648A CN201610342926.8A CN201610342926A CN105932648A CN 105932648 A CN105932648 A CN 105932648A CN 201610342926 A CN201610342926 A CN 201610342926A CN 105932648 A CN105932648 A CN 105932648A
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- CN
- China
- Prior art keywords
- direct
- distribution system
- circuit
- linkage
- protection device
- 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
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/22—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for distribution gear, e.g. bus-bar systems; for switching devices
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
- H02H3/087—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current for dc applications
Abstract
The invention discloses a load security protection device used for a direct-current power distribution system. An inductor is independently connected to a circuit between the positive bus bar of the direct-current power distribution system and load in series as well as connected to the circuit between the negative bus bar of the direct-current power distribution system and the load in series; a switching device is connected behind each inductor in series; two ends of the inductors are connected with a detection device in parallel; the switching devices are provided with a linkage device which controls the switching devices to be on and off; and the detection device is electrically connected with the linkage device for controlling the switching device to be on and off according to whether two ends of each inductor are subjected to overvoltage or not. The protection device which is designed by the invention and is suitable for the direct-current power distribution system achieves a circuit protection purpose in a way that the large inductors are connected in series in the circuit and are cooperated with the detection device and the linkage device. When the circuit is subjected to the overvoltage, the increase of circuit current is alleviated due to the inhibition function of the big inductors in the circuit. When the detection device detects that the voltage of the bus bar exceeds an allowable range, the linkage device can quickly cut off the load. When the voltage of the bus bar returns to normal, the linkage device is switched, and then, the load is accessed.
Description
Technical field
The present invention relates to electrical engineering field and DC distribution field, be specifically related to a kind of payload security for direct-flow distribution system
Protection device.
Background technology
Direct current power system is mainly used in the fields such as electric propulsion, regenerative resource distributed power grid and overlength distance high voltage power transmission
Close.Along with track traffic, the Large scale construction of the systems such as D.C. high voltage transmission and planning, direct current transmission and distribution system has welcome one
In the gold period of individual fast development, the correlational study work from system to equipment all becomes one emerging study hotspot of power industry.
Although the basic operation characteristic of system is widely different in different application scenarios, but be required for without exception circuit protection device this
The power equipment of one key.
Nowadays the control strategy coordinated about DC distribution net voltage has become focus, but direct current distribution can not be tackled extremely short
The sudden change of voltage in time, direct current distribution scheduling strategy study the most slightly achievement, but scheduling strategy generally have certain inertia and
The violent variation of millisecond even Microsecond grade can not be solved.Although exchange distribution network systems has evolved into ripe, but still installation cannot be avoided molten
The disconnected current limiter such as device or electric fuse.The rated voltage of a lot of DC equipments itself is smaller, and the pressure voltage of himself is the highest, because of
The design of this this key equipment of electric protective device is just particularly important.
Electric protective device is the visual plant of direct-flow distribution system, can be when line failure by monitoring in real time and spirit
Quick action, fast shut-off fault, and after Failure elimination, realize reclosing.Its Main Function is the operation changing straight-flow system
Mode, removes the fault that DC side occurs.Its major function includes closing, monitor and cut-off the electric current under normal loop condition, turns
Change system operation mode and disengagement failure electric current, system is carried out protection etc..
During DC distribution net line failure, load voltage abruptly increase can be caused, be easily generated overvoltage, if the most electrically protecting
Protection unit, easily causes equipment overvoltage, damage equipment.
Summary of the invention
The technical problem to be solved in the present invention is: provide the design of a kind of payload security protection device for direct-flow distribution system,
Designed protection device has good short-circuit protection performance, can be widely applied in direct-flow distribution system, can be as short circuit and mistake
The protector of electric current.There is simple in construction, the advantage such as easy to use, cheap.When electrical network or electrical equipment are short-circuited former
When barrier or overload, can automatic shutdown circuit, it is to avoid electric equipment damages, and Accident prevention spreads.
The technical scheme of the technical problem to be solved in the present invention is:
A kind of payload security protection device for direct-flow distribution system, between the positive and negative busbar and load of direct-flow distribution system
Difference tandem electric inductance on circuit, the rear concatenation switching device of inductance, described inductance two ends are also connected to detect device, described
Switching device has the linkage controlling its folding；Described detection device is electrically connected with linkage, in order to according to inductance two
The presence or absence of end overvoltage, controls the folding of switching device.
Preferably, described detection device is voltage check device, is used for detecting whether inductance two ends have overvoltage.
Preferably, described linkage is electric auto recloser.
Preferably, described linkage detection device set numerical value as busbar voltage have ± 2% beyond carry out breaking-closing operating.
The excellent effect of the present invention:
The invention discloses a kind of payload security protection device for direct-flow distribution system, in straight-flow system, when circuit mistake
When carrying or be short-circuited, due to the instantaneous increase of load voltage, easily cause line over-voltage.If do not increased protection device, can burn
Bad electrical equipment, causes unnecessary loss.The protection device being applicable to direct-flow distribution system designed by the present invention, at circuit
The big inductance of middle series connection, and coordinate detection device and the use of linkage, reach the purpose of protection circuit.When circuit occurred electricity
Pressure, due to the inhibitory action of inductance big in circuit, slow down the increase of line current.When detection device detects that busbar voltage surpasses
When crossing allowed band, linkage can action rapidly, cut off load；When busbar voltage is recovered normal, linkage can be again
Action, accesses load.Protection device designed by the present invention can realize the sensitive action of Millisecond, real-time guard circuit, more
The most economical.
Accompanying drawing explanation
Accompanying drawing described herein, in order to provide a further understanding of the present invention, constitutes the part of the present patent application, the present invention
Schematic description and description be used for explaining the present invention, be not intended that inappropriate limitation of the present invention.
The present invention is further described with embodiment below in conjunction with the accompanying drawings.
Fig. 1 is the payload security protection device circuit theory diagrams for direct-flow distribution system；
Fig. 2 is the payload security protection device workflow diagram for direct-flow distribution system.
Detailed description of the invention
The technology contents of the present invention is described below by way of particular specific embodiment, and those skilled in the art can be taken off by this specification
The content shown understands further advantage and effect of the present invention easily.The present invention also can by other different specific embodiment in addition
Implementing or application, the every details in this specification also can be based on different viewpoints and application, under the spirit of the present invention
Carry out various modification and change.
Below in conjunction with accompanying drawing, the present invention is further detailed explanation.
It is illustrated in figure 1 the circuit theory diagrams of the payload security protection device for direct-flow distribution system.
Owing to DC load self contains the sensitive ingredients of trace, but far from controlling or suppression voltage, the sudden change of electric current.Cause
This big inductance of connecting in the line, under steady-state operating condition, inductance is inoperative, the most a small amount of electromagnetic consumable.Work as line electricity
Pressure sudden change or system cross stream, are gone here and there the sudden change of voltage x current in big inductance energy limiting circuitry in circuit, and gone here and there inductance is the biggest, at that time
Between constant the biggest, then the strongest to the inhibitory action of current break.
A kind of payload security protection device for direct-flow distribution system of the present invention, at the positive and negative busbar of direct-flow distribution system with negative
Difference tandem electric inductance on circuit between load, the rear concatenation switching device of inductance, described inductance two ends are also connected to detect device,
Described switching device has the linkage controlling its folding；Described detection device is electrically connected with linkage, in order to according to electricity
The presence or absence of sense two ends overvoltage, controls the folding of switching device.
Preferably, described linkage is electric auto recloser.So-called auto recloser, is will to jump because of fault
A kind of automaton that chopper after opening automatically engages on demand.Power system uses auto recloser, is greatly enhanced
The reliability of power supply, decreases loss of outage, but also improves the Transient Stability Level of power system, enhance circuit
Power transmission capacity.
Divide by the action of reclosing, electric and mechanical type can be divided into, act on the mode of chopper by reclosing, can divide
For the common reclosing of three-phase, single-pole reclosing and composite auto-reclosing three kinds.
When line failure produces overcurrent, due to the existence of inductance big in circuit so that line current can not suddenly change.
Described detection device is voltage check device, is used for detecting whether inductance two ends have overvoltage.Current break process is suppressed at inductance
In, detection device utilizes suppression space in short-term, detection line voltage distribution and current value, and signal is passed to linkage, enters
Row sub-switching operation.
See the payload security protection device workflow diagram of Fig. 2 direct-flow distribution system, when detection device detects that line current increases
When making greatly voltage exceed normal fluctuation range (± 2%), the rapid action of linkage can be triggered, cut off load, protection circuit.
Meanwhile, detection device, can reclosing in good time by the monitoring to busbar voltage, it is ensured that system is properly functioning.
Designed protection device has good short-circuit protection performance, can be widely applied in direct-flow distribution system, can be as short circuit
Protector with overcurrent.There is simple in construction, the advantage such as easy to use, cheap.When electrical network or electrical equipment occur short
When road fault or overload, can automatic shutdown circuit, it is to avoid electric equipment damages, and Accident prevention spreads.
In sum, the present invention by connect big inductance, and detection device and linkage with the use of, the most economically
Designed protection device is used in direct-flow distribution system.Pass through gone here and there big inductance suppression circuit current break, and coordinate detection dress
The detection in real time put and the sensitive action of linkage, reach the purpose of protection circuit.
Compared with prior art, protection device designed by the present invention compensate for existing direct current distribution and can not tackle lacking of sort time overcurrent
Falling into, under conditions of direct current transmission and distribution system fast development, protection device is as system core power equipment, and its research becomes
Focus, present invention can apply to direct-flow distribution system, has the strongest practicality and novelty.
Although this patent is explained with reference to preferred embodiment and accompanying drawing, but above-mentioned explanation should be regarded as illustrative rather than limit
Property processed, change that those skilled in the art is made according to the spirit of the present invention and amendment, all should belong to the protection domain of this patent.
Claims (4)
1. the payload security protection device for direct-flow distribution system, it is characterised in that:
Difference tandem electric inductance on the circuit between the positive and negative busbar and load of direct-flow distribution system, the rear concatenation switch dress of inductance
Put,
Described inductance two ends also are connected to detect device, and described switching device has the linkage controlling its folding；
Described detection device is electrically connected with linkage, in order to the presence or absence according to inductance two ends overvoltage, controls switching device
Folding.
A kind of payload security protection device for direct-flow distribution system the most according to claim 1, it is characterised in that:
Described detection device is voltage check device, is used for detecting whether inductance two ends have overvoltage.
A kind of payload security protection device for direct-flow distribution system the most according to claim 1, it is characterised in that:
Described linkage is electric auto recloser.
A kind of payload security protection device for direct-flow distribution system the most according to claim 1, it is characterised in that:
Described linkage detection device set numerical value as busbar voltage have ± 2% beyond carry out breaking-closing operating.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610342926.8A CN105932648A (en) | 2016-05-20 | 2016-05-20 | Load security protection device used for direct-current power distribution system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610342926.8A CN105932648A (en) | 2016-05-20 | 2016-05-20 | Load security protection device used for direct-current power distribution system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105932648A true CN105932648A (en) | 2016-09-07 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610342926.8A Pending CN105932648A (en) | 2016-05-20 | 2016-05-20 | Load security protection device used for direct-current power distribution system |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101820162A (en) * | 2010-05-18 | 2010-09-01 | 北京星网锐捷网络技术有限公司 | Overcurrent protector |
| CN102237785A (en) * | 2011-07-14 | 2011-11-09 | 中国矿业大学 | Method and device for improving performance of intrinsic safety switching power supply |
| US20120153963A1 (en) * | 2010-12-17 | 2012-06-21 | Peter Michael Tyler | Testing of a transient voltage protection device |
| CN104821563A (en) * | 2015-05-25 | 2015-08-05 | 舒尔环保科技（合肥）有限公司 | Zero-loss depth current-limiting protection device |
-
2016
- 2016-05-20 CN CN201610342926.8A patent/CN105932648A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101820162A (en) * | 2010-05-18 | 2010-09-01 | 北京星网锐捷网络技术有限公司 | Overcurrent protector |
| US20120153963A1 (en) * | 2010-12-17 | 2012-06-21 | Peter Michael Tyler | Testing of a transient voltage protection device |
| CN102237785A (en) * | 2011-07-14 | 2011-11-09 | 中国矿业大学 | Method and device for improving performance of intrinsic safety switching power supply |
| CN104821563A (en) * | 2015-05-25 | 2015-08-05 | 舒尔环保科技（合肥）有限公司 | Zero-loss depth current-limiting protection device |
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Application publication date: 20160907 |
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