CN205645723U - Can realize short -circuit protection's controllable electromagnetism release - Google Patents
Can realize short -circuit protection's controllable electromagnetism release Download PDFInfo
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- CN205645723U CN205645723U CN201620084378.9U CN201620084378U CN205645723U CN 205645723 U CN205645723 U CN 205645723U CN 201620084378 U CN201620084378 U CN 201620084378U CN 205645723 U CN205645723 U CN 205645723U
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Abstract
Can realize short -circuit protection's controllable electromagnetism release, this system includes hasp, electro -magnet, current coil, control coil, control switch, detection circuitry, delay circuit, trigger circuit and control circuit, through increasing a winding, realize the short delay control of short circuit, this electromagnetism release can be accomplished the short time -delayed protection of short circuit and move the protection short circuit wink promptly, can improve the reliability of circuit greatly, is convenient for realize the protection characteristic's of the superior and the subordinate cooperation and ZSI control.
Description
Technical field
This utility model relates to electromagnet electrical apparatus release, refers specifically to a kind of to realize short circuit short time-delay and short circuit wink dynamic control method.
Background technology
Since entering 21 century, after particularly 2003 beautiful ash moss, American Electric Power research institute (EPRI) proposes intelligent grid framework (IntelliGrid Architecture), has caused the interior research and development to intelligent grid of world wide and construction.In addition the actively pushing forward of national governments, intelligent grid has become the focus attracted attention in the world.China national grid company discloses intelligent grid development plan to society first in May, 2009, indicates that agenda is the most formally included in China's intelligent grid construction in.Based on the construction of intelligent grid needs intelligent electrical apparatus, the electric energy that power plant sends all transfers out under high and low voltage electrical equipment control.Therefore, a real full automatic electric power transmission network, electrical equipment has irreplaceable effect in electrical network.
Low-voltage circuit breaker is the electric energy distribution and protection electrical equipment being most widely used.According to statistics, the generated output more than 80% is consumed in low voltage electric network, and the fault of power system 95% occurs in distribution side, and the low-voltage circuit breaker output value accounts for more than the 50% of the low-voltage electrical apparatus gross output value.Low-voltage circuit breaker is broadly divided into omnipotent breaker ACB(Air Circuit Breaker), mold cased circuit breaker MCCB(Moulded Case Circuit
Breaker) and miniature circuit breaker MCB(Miniature Circuit Breaker).ACB is mainly used in power distribution network, is used for distributing electric energy, protection circuit and power-supply device.Domestic ACB total amount in 2008 is more than 600,000 according to statistics, and wherein "smart" products ratio accounts for 45% by number of units, accounts for 80% by the output value.MCCB is mainly used to distribute electric energy and protection circuit, power-supply device or motor from overload, short circuit or the damage of under-voltage fault.The annual requirement of domestic MCCB about 24,000,000, the most intelligent ratio accounted for is less than 1%.MCB is mainly used in terminal power distribution circuit, provides overload and short-circuit protection to circuit.The annual production of MCB, more than 500,000,000 poles, is mostly used in terminal power distribution and civil buildings.As can be seen here, the critical role of low-voltage circuit breaker has some idea of.
Having a variety of tripping mechanism for realizing various protection in chopper, wherein short-circuit protection uses electromagnetic trip mostly, and electromagnetic trip is a kind of a kind of dropout mode by operation electriomagnet, the short-circuit instantaneous protection being mainly used in chopper.In order to ensure reliability and the seriality of power supply, it is often necessary to higher level's chopper has short circuit short time-delay protection feature, in order to realize selective protection.Fig. 1 represents a low-voltage distribution system and the protection feature of the superior and the subordinate's chopper.Higher level chopper CB0 has three section protection characteristic (overload long delay, short circuit short time-delay and short circuit instantaneous protection), and subordinate chopper CB1 has two sections of protection features (overload long delay and short circuit instantaneous protection).When branch road 1 short circuit, and when short circuit current is I1, short circuit current makes chopper CB1 first action, higher level chopper CB0 be failure to actuate due to short time delay, thus ensure that branch road 2 and the seriality of branch road 3 power supply.Under prescribed conditions, can not cause higher level's breaker actuation during subordinate's breaker actuation, this is the basic demand of selective protection.It is referred to as local selective when subordinate's chopper could realize selective protection below the fault current of regulation, in Fig. 1, after I<selective protection, I can be realized during I2>I2, CB0 and CB1 action simultaneously, no longer possess selectivity.
The cooperation that it is critical only that each level breaker protective property of selective protection.At present, more selective protection method is used to have: electric current selection, selection of time and zone selective interlock ZSI (Zone Selective Interlocking).
Theoretically, use selection of time and electric current selection to match and can realize full selectivity protection.But when distribution level is more, delay time cumulative step by step can make top layer chopper bear the short-circuit current rush of long period.ZSI can be effectively prevented from blindly time delay, shortens dramatically, reduce the requirement to higher level's chopper dynamic thermal stability when making higher level's chopper predetermined motion times than simple employing selection of time mode, is the presently preferred method realizing full selectivity protection.ZSI has been a maturation the most and has applied the most universal technology.Particularly in the late nineteen eighties in 20th century, release the low-voltage circuit breaker with intelligent electrical apparatus release in the world, not only increase the performance of chopper, also promote the development of ZSI technology.American National Standard ANSI and ieee standard recommend low-voltage circuit breaker to use ZSI technology.But, major part ZSI is still realized by circuit interconnecting method.Existing control method has its limitation, needs a kind of new control method to realize short circuit short time-delay and short circuit instantaneous protection.
Summary of the invention
Utility model purpose:
For solving the problems referred to above, this utility model provides a kind of controllable electromagnetic electrical apparatus release realizing short-circuit protection and control method, its objective is to solve the problem that electric power system circuit breaker short-circuit protection exists.This utility model is different from the control method of traditional intelligent breaker.Propose the controllable electromagnetic dropout theory that can realize short circuit short time-delay and instantaneous characteristic first, and short circuit delay time is controlled.It is easy in power system, realize the superior and the subordinate's protection feature coordinate and ZSI control.Being effectively reduced the superior and the subordinate to trip or the phenomenon of tripping operation of bypassing the immediate leadership, the development to intelligent electric appliance has the strongest impetus simultaneously.
Technical scheme:
The system of the controllable electromagnetic electrical apparatus release of short-circuit protection can be realized, it is characterised in that: this system includes snap close, electric magnet, current coil, control coil, control switch, testing circuit, delay circuit, triggering circuit and control circuit；The side of U-shaped electric magnet is wound around current coil, opposite side arranges control coil, control coil upper end is provided with reaction spring, reaction spring connects lever connecting rod one end, this end of lever connecting rod is connected with one end of the armature of snap close by connecting rod again, the opening and closing movement of the electromagnetic attraction co-controlling armature of reaction spring and U-shaped electric magnet；Connecting delay circuit for monitoring the testing circuit of the electric current of major loop, delay circuit connection triggers circuit, triggers circuit and connects control circuit, and control circuit connects control switch, controls switch and connects control coil；The other end of lever connecting rod controls move up and down and then realize the adhesive of electric magnet and open by current coil.
Control method is as follows: when normally working, the control coil of secondary side is in short-circuit condition, if circuit is short-circuited, can detect via testing circuit, the most again by delay circuit, triggering circuit, and effect makes the control coil of secondary side disconnect on the control circuitry, now electromagnetic actuation, i.e. lever connecting rod Guan Bi, drive and move on snap close, the armature making the i.e. electrical apparatus release of snap close is threaded off, open-circuit line；Delay circuit use inverse time-lag, when short circuit current is the biggest when, delay time is extremely short, can approximate regard as short circuit wink move.
The foundation of this method is that the magnetictrip controlled by current coil belongs to the permanent magnetic potential system of exchange, magnetic linkage electromagnetic system permanent from exchange is different, increasing a short-circuit Secondary Winding will not cause once winding current to increase, and the main flux of magnetic circuit can be made on the contrary to reduce, and electromagnetic force reduces；According to foundation of the present utility model, so that it may reach the purpose of short circuit short time-delay, and delay time is controlled.
Advantage and effect: this paper presents a kind of novel controllable electromagnetic tripper structure and control method; by increasing a winding; realize the short delays time to control of short circuit; this magnetictrip i.e. can complete short circuit short time-delay protection and short circuit instantaneous protection; it is greatly improved the reliability of circuit, it is simple to the cooperation and the ZSI that realize the superior and the subordinate's protection feature control.
Accompanying drawing explanation
Fig. 1 is the protection feature figure of a low-voltage distribution system and the superior and the subordinate's chopper；
Description of reference numerals: higher level chopper CB0 has three section protection characteristic, subordinate chopper CB1 has two sections of protection features.
Fig. 2 is the system structure control principle drawing that the utility model proposes；
Description of reference numerals: 1-snap close, 2-connecting rod, 3-electric magnet, 4-current coil, 5-control coil, 6-controls switch.
Fig. 3 is protection feature schematic diagram of the present utility model；
Description of reference numerals: Fig. 3 a) be tradition magnetictrip protection feature schematic diagram, Fig. 3 b) be present study propose controllable electromagnetic electrical apparatus release protection feature schematic diagram.Minimum short circuit drop-away current when I1 is control coil open circuit in figure, minimum short circuit drop-away current when I2 is control coil short circuit, Ttr is drop-away time.
Detailed description of the invention:
Below in conjunction with the accompanying drawings this utility model is described further:
The utility model proposes a kind of controllable electromagnetic electrical apparatus release realizing short-circuit protection and method.It belongs to the permanent magnetic potential system of exchange, once winding current will not be caused to increase based on increasing a short-circuit Secondary Winding, the main flux of magnetic circuit can be made on the contrary to reduce, the principle that electromagnetic force reduces, it is achieved the short-circuit protection of magnetictrip.
This system includes snap close 1, electric magnet 3, current coil 4, control coil 5 and controls switch 6 as in figure 2 it is shown, it also includes testing circuit, delay circuit, triggering circuit and control circuit.
The side of U-shaped electric magnet 3 is wound around current coil 4, opposite side arranges control coil 5, control coil 5 upper end is provided with reaction spring, reaction spring connects lever connecting rod one end, this end of lever connecting rod is connected with one end of the armature of snap close 1 by connecting rod 2 again, the opening and closing movement of the electromagnetic attraction co-controlling armature of reaction spring and U-shaped electric magnet 3；Connecting delay circuit for monitoring the testing circuit of the electric current of major loop, delay circuit connection triggers circuit, triggers circuit and connects control circuit, and control circuit connects control switch 6, controls switch 6 connection control coils 5；The other end of lever connecting rod controls move up and down and then realize the adhesive of electric magnet 3 and open by current coil 4.
When current coil 4 flows through normal current, the control coil 5 of secondary side is in short-circuit condition, and due to the demagnetizing effect of control coil 5, drop-away current value can increase.If it occur that it is short-circuit, when current value is the biggest, the electric current of current coil 4 can detect via testing circuit, and the most again by delay circuit, delay time can be adjusted according to the size of electric current, again through triggering circuit, the control coil 5 in control circuit is made to disconnect, now electric magnet 3 adhesive, drivening rod 2, snap close 1 is threaded off, open-circuit line.Coordinate the protection feature that long delay overload protection realizes as it is shown on figure 3, Fig. 3 a) it is the protection feature schematic diagram of traditional structure magnetictrip, Fig. 3 b) the protection feature schematic diagram of controllable electromagnetic electrical apparatus release for the utility model proposes.When control coil 5 is opened a way, the magnetictrip of traditional structure is identical with magnetictrip protection feature of the present utility model；During control coil 5 short circuit, due to the demagnetizing effect of control coil 5, drop-away current value can increase；Short-circuit current value is at Fig. 3 b) I1 and I2 between time, by control control coil 5 short circuit duration, so that it may realize short circuit short time-delay time control.Trip or the phenomenon of tripping operation of bypassing the immediate leadership it is thus possible to effectively reduce the superior and the subordinate simultaneously, also provide new control method for ZSI technology.Certainly, this is a preferred scheme of the application, is not limited to this control method, and including the short time delay utilizing the demagnetizing effect of this increase short-circuited winding to realize all is calculated, such as when normally working, control coil is in off state；When circuit is short-circuited, allow its control coil close, enter time delay.And solenoid electromagnet the most also should can realize short time delay in structure.
In sum, the utility model proposes short-circuited winding is applied on magnetictrip.Utilize the demagnetizing effect of short-circuited winding, it is achieved short circuit short time-delay.By controlling the short circuit duration of winding, control the drop-away time of electrical apparatus release.
Claims (1)
1. can realize the controllable electromagnetic electrical apparatus release of short-circuit protection, it is characterised in that: this electrical apparatus release includes snap close (1), electric magnet (3), current coil (4), control coil (5), controls switch (6), testing circuit, delay circuit, triggering circuit and control circuit；The side of U-shaped electric magnet (3) is wound around current coil (4), opposite side arranges control coil (5), control coil (5) upper end is provided with reaction spring, reaction spring connects lever connecting rod one end, this end of lever connecting rod is connected with one end of the armature of snap close (1) by connecting rod (2) again, the opening and closing movement of the electromagnetic attraction co-controlling armature of reaction spring and U-shaped electric magnet (3)；Connecting delay circuit for monitoring the testing circuit of the electric current of major loop, delay circuit connection triggers circuit, triggers circuit and connects control circuit, and control circuit connects control switch (6), controls switch (6) and connects control coil (5)；The other end of lever connecting rod controls move up and down and then realize the adhesive of electric magnet (3) and open by current coil (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620084378.9U CN205645723U (en) | 2016-01-28 | 2016-01-28 | Can realize short -circuit protection's controllable electromagnetism release |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620084378.9U CN205645723U (en) | 2016-01-28 | 2016-01-28 | Can realize short -circuit protection's controllable electromagnetism release |
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| Publication Number | Publication Date |
|---|---|
| CN205645723U true CN205645723U (en) | 2016-10-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620084378.9U Expired - Fee Related CN205645723U (en) | 2016-01-28 | 2016-01-28 | Can realize short -circuit protection's controllable electromagnetism release |
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| CN (1) | CN205645723U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105529228A (en) * | 2016-01-28 | 2016-04-27 | 沈阳工业大学 | Controllable electromagnetic release capable of realizing short-circuit protection and control method |
| CN108305820A (en) * | 2018-02-23 | 2018-07-20 | 南京飞腾电子科技有限公司 | A kind of breaker |
| CN113931548A (en) * | 2021-09-13 | 2022-01-14 | 合肥美的电冰箱有限公司 | Door opening assembly of storage cabinet and storage cabinet |
-
2016
- 2016-01-28 CN CN201620084378.9U patent/CN205645723U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105529228A (en) * | 2016-01-28 | 2016-04-27 | 沈阳工业大学 | Controllable electromagnetic release capable of realizing short-circuit protection and control method |
| CN108305820A (en) * | 2018-02-23 | 2018-07-20 | 南京飞腾电子科技有限公司 | A kind of breaker |
| CN113931548A (en) * | 2021-09-13 | 2022-01-14 | 合肥美的电冰箱有限公司 | Door opening assembly of storage cabinet and storage cabinet |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20161012 Termination date: 20190128 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |