CN102768915A - Contact breaking low loss circuit and application in switch - Google Patents
Contact breaking low loss circuit and application in switch Download PDFInfo
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- CN102768915A CN102768915A CN201210214214XA CN201210214214A CN102768915A CN 102768915 A CN102768915 A CN 102768915A CN 201210214214X A CN201210214214X A CN 201210214214XA CN 201210214214 A CN201210214214 A CN 201210214214A CN 102768915 A CN102768915 A CN 102768915A
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Abstract
The invention relates to a contact breaking low loss circuit, which is formed by connecting a main mechanical switch and a breaking branch in parallel, wherein the breaking branch is formed by connecting a current sensitive device, a diode circuit and an auxiliary switch in series; the diode circuit ensures that no current passes by the breaking branch when the main switch is closed; and the current sensitive device is specifically responsible for breaking or current decreasing in the low loss circuit. The main mechanical switch performs self current decreasing, voltage reduction and breaking firstly in the current division and voltage division environment of the breaking branch, and then the auxiliary mechanical switch performs current decreasing and breaking after the current sensitive device accomplishes actions. Through technical measures such as short circuits and open circuits, the current sensitive device loses effectiveness during the switching on and energizing operation processes, the problem about false operation of the current sensitive device is eliminated, and the low loss circuit can be used as an AC/DC switch.
Description
Technical field the present invention mainly is applicable to device for switching.
The background technology mechanical switch relies on the contact electric current of make-and-break, and to the basic demand of contact be: contact resistance is little.The contact exists electrical wear and mechanical wear in running, electrical wear is the principal element in influencing contactor life-span, owing in make and break process, there is the arc discharge effect between the contact; Cause the variation of slider material generation mechanical property and chemical property and cause electrical wear; Electrical wear is the principal element that causes the slider material loss, and when loss acquired a certain degree, the contact contact quality seriously descended; It is big that contact resistance becomes, contact loss of function and losing efficacy.
Summary of the invention task of the present invention provides and a kind ofly can prolong the Low-loss circuit of contact electric life and be applied to AC-DC switch electrical equipment.
Said Low-loss circuit is formed in parallel by main frame tool switch (hereinafter to be referred as main switch) and disjunction branch road; Disjunction is propped up route electric current Sensitive Apparatus, diode circuit and auxiliary switch and is in series; Low-loss circuit is connected in the supply line and uses, and in the alternating current circuit, forms after two diode reverse parallel connections of diode electrically route; In DC line; Can use to exchange interior circuit, also can be made up of a diode, the connection polarity of this diode should allow through the circuit direct current; Pressure drop when the diode circuit in the disjunction branch road is used for offsetting the main switch closure on the contact resistance, no current flows through the disjunction branch road when guaranteeing the main switch closure; When circuit was connected, main switch was in closure state, owing to have diode circuit in the disjunction branch road, the disjunction branch road does not have electric current to pass through, and carries whole line currents by main switch, and the auxiliary switch state is any, and the regulation auxiliary switch is in off-state; When needs disjunction circuit, at first closed auxiliary switch breaks off main switch again; In main switch disconnection process, because its contact contact resistance becomes big, switch ends voltage is greater than the diode circuit pressure drop; Disjunction branch road line attachment has electric current to flow through in the electric current Sensitive Apparatus.The electric current Sensitive Apparatus is specifically responsible for the disconnection of line current or is fallen the stream task in Low-loss circuit; Should have non-linear rheostat characteristic, initial resistance is little, when flowing through wherein electric current much larger than its operating current; The resistance sudden change; Be high resistant or fusing, the electric current Sensitive Apparatus also should have suitable action speed, bear before making that main switch is reliable and breaking off, flow through the voltage that forms after that the disjunction branch road produces, disjunction branch road and the load dividing potential drop by line current and be significantly less than the electric power system rated operational voltage; Then main switch self falls stream, step-down disjunction in the shunting of disjunction branch road, dividing potential drop environment; Electric current Sensitive Apparatus operating current will be much smaller than the rated operational current of circuit; The circuit running current is as far as the electric current Sensitive Apparatus; It is exactly a kind of overcurrent; The electric current Sensitive Apparatus is answered action message when flowing through the circuit running current, its equivalent resistance is high resistant or fusing, makes that stream or vanishing fall in the load current on this circuit.On the sequential, auxiliary switch just can break off after electric current Sensitive Apparatus action is accomplished, thus auxiliary switch only need break off much smaller than the circuit rated operational current, the residual current behind the stream falls by the electric current Sensitive Apparatus.
Shunting, the dividing potential drop of the inner disjunction branch road of Low-loss circuit, fall the stream effect, Low-loss circuit is carried when breaking off having, with respect to line work voltage, operating current, main switch has step-down, falls the disconnected characteristic of flow point; Auxiliary switch has the disconnected characteristic of the flow point of falling, and makes Low-loss circuit have the function that reduces internal switch contact disjunction loss.
If the negative actuation according to disjunction is connected this Low-loss circuit, then behind at first closed auxiliary switch, through the disjunction branch road; Circuit is connected, and at this moment, auxiliary switch does not have the properties of flow of falling; This electric current can make the electric current Sensitive Apparatus misoperation in the branch deenergizing simultaneously; When main switch is closed, can produce secondary again and connect phenomenon, so Low-loss circuit does not possess the function that reduces the loss of internal switch contacting, when in device for switching, using; Take technical measures, prevent to take place in the connection process misoperation of electric current Sensitive Apparatus.
The electric current Sensitive Apparatus can adopt existing over-current protection device to realize.
If the initial resistance of electric current Sensitive Apparatus is enough little and have an onset late effect; Time of delay is greater than the disjunction operate time of main switch; Guarantee before the reliable disconnection of main switch; The end pressure value of branch deenergizing that is parallel to main switch is less than the arcing voltage threshold values of main switch, after then main switch is transferred to the disjunction branch road with whole line currents, no arc breaks off under the condition of voltage less than the arcing voltage threshold values.
If do not have diode circuit in the disjunction branch road, after the auxiliary switch closure, the electric current Sensitive Apparatus just has electric current to flow through; And after the auxiliary switch closure, main switch begins the time difference between the disjunction constantly, and is different along with operating personnel's difference, be not easy to design sequential and guarantee disjunction operate time electric current Sensitive Apparatus time of delay greater than main switch; Realize that no arc breaks off; In the disjunction branch road, diode circuit is set, has eliminated operating personnel's human factor, guaranteed that the through-flow zero hour of disjunction branch road and main switch disjunction are synchronous the zero hour; Make things convenient for timing Design, guaranteed the condition that no arc breaks off.
The operating current of electric current Sensitive Apparatus is much smaller than the rated operational current of circuit; The regular link operating current is a kind of serious overcurrent as far as the electric current Sensitive Apparatus, and electric current Sensitive Apparatus action message under this serious overcurrent effect is after one period operate time; Its equivalent resistance becomes enough big or fuses; Make the circuit residual current less than mechanical auxiliary switch striking current threshold values, on the sequential, mechanical auxiliary switch is accomplished back no arc disconnection under less than the striking current threshold values in electric current Sensitive Apparatus action.
Naturally, extinguishes characteristic owing to connect after electric arc has short, switch closure of time, adopt in the device for switching of no arc disconnection Low-loss circuit and arc-control device need be set.
The electric current Sensitive Apparatus adopts common fuse over-current protection device, needs artificial the replacing after its action; Adopt overcurrent protection PTC thermistor, recover fuse etc. certainly and recover over-current protection device certainly; Its action is after over recovery auto restore facility after the time; Do not need artificial the replacing, so adopt the device for switching of Low-loss circuit should dispose from recovering over-current protection device as the electric current Sensitive Apparatus.
Electrical wear is the principal element that causes the slider material loss; Electrical wear is owing in make and break process, there is the arc discharge effect between the contact; Cause the variation of slider material generation mechanical property and chemical property to cause, extinguish characteristic naturally after electric arc has short, switch closure of time owing to connect, connection electric arc to the degree of injury of slider material much smaller than breaking arc; Because Low-loss circuit has the function that reduces internal switch contact disjunction loss; So Low-loss circuit can obviously reduce the slider material loss, has prolonged the contact electric life, adopt no arc to break off in the device for switching of Low-loss circuit and arc-control device need be set.
Hereinafter combines accompanying drawing and embodiment that the present invention is further described.
Fig. 1 is Low-loss circuit operation principle and the application drawing in device for switching thereof.
Embodiment Fig. 1 has provided the Low-loss circuit fundamental diagram.
Low-loss circuit; Be formed in parallel by main frame tool K switch 1 and disjunction branch road; Disjunction forms with electric current Sensitive Apparatus FU, 2 series connection of subsidiary engine tool K switch after propping up two diode D1 of route, D2 reverse parallel connection again, and the inner electric current Sensitive Apparatus of disjunction branch road has adopted and recovered fuse certainly.This Low-loss circuit is adapted in the AC and DC circuit, using.
Low-loss circuit is connected in the supply line and uses, and when circuit was connected, main switch K1 was in closure state; Because have diode circuit in the disjunction branch road, the disjunction branch road does not have electric current to pass through, and carries whole line currents by main switch; The auxiliary switch state is any, and regulation auxiliary switch K2 is in off-state; When circuit broke off, main switch K1, auxiliary switch K2 all were in off-state.
The open-circuit line order of operation is: the closed auxiliary switch K2 of elder generation, break off main switch K1 again, and break off auxiliary switch K2 at last.
There is diode circuit in closed auxiliary switch K2 owing in the disjunction branch road earlier, and the disjunction branch road does not have electric current to pass through, and carries whole line currents by main switch.
In the main switch K1 disconnection process, because its contact contact resistance becomes big, the contact voltage is greater than the diode circuit pressure drop; Disjunction branch road line attachment; Line current shifts to the disjunction branch road, and it is enough little to recover fuse F U initial resistance certainly, selects suitable fusing speed; Make the disjunction operate time of time of delay that fuse greater than main switch K1; Before guaranteeing that main switch K1 is reliable and breaking off, the end pressure value of main switch K1 is less than its arcing voltage threshold values, after then main switch K1 transfers to the disjunction branch road with whole line currents, no arc disconnection under the condition of voltage less than the arcing voltage threshold values.
Rated operational current from the operating current that recovers fuse F U much smaller than circuit; The circuit running current is as far as being a kind of serious overcurrent from recovering fuse F U, and fuse F U action message under this serious overcurrent effect is after one period action time of delay; Be high resistant from recovering fuse F U; Make the circuit residual current less than auxiliary switch K2 striking current threshold values, on the sequential, auxiliary switch K2 accomplishes back no arc disconnection under less than the striking current threshold values recovering fuse F U action certainly.
If the negative actuation according to disjunction is connected this Low-loss circuit, then behind at first closed auxiliary switch K2, through a minute deenergizing; Circuit is connected; Have electric current in the circuit, at this moment, auxiliary switch K2 does not have the properties of flow of falling; This electric current can make the U of the recovery fuse F certainly misoperation in the branch deenergizing simultaneously, when main switch K1 is closed, can produce secondary again and connect phenomenon.Be from recovering fuse F U undesirable misoperation to have taken place, this Low-loss circuit still can be connected, and just auxiliary switch K2, main switch K1 do not possess the function that reduces the contacting loss.
When Low-loss circuit is used,, take technical measures in device for switching, prevent from recovering fuse F U misoperation to take place in the connection process in order not waste from recovering fuse F U lifetime effective action number of times.
When stipulating that here Low-loss circuit is used as device for switching, the connection order is: it is constant to keep auxiliary switch K2 off-state, closed main switch K1.
Under such order of operation, when connecting circuit, close main switch K1 earlier; K switch 1, load L that short circuit disjunction branch road, link tester are closed excessively connect, and AC power AC supplies power to load L; In the connection process misoperation can not take place from recovering fuse F U; Low-loss circuit opening operation order still is: the closed auxiliary switch K2 of elder generation, break off main switch K1 again, and break off auxiliary switch K2 at last.
As long as it is constant that auxiliary switch K2 off-state is kept in execution, the connection order of closed main switch K1 keeps turn-off sequence constant, and Low-loss circuit just can be eliminated the electric current Sensitive Apparatus misoperation problem in the connection process, can be used as switch and uses.
In a word, through short circuit, technical measures such as open circuit, make the electric current Sensitive Apparatus connecting, losing efficacy in the energising running, eliminate electric current Sensitive Apparatus misoperation problem, Low-loss circuit promptly can be used as switch and uses.
Claims (6)
1. Low-loss circuit is characterized in that:
Said Low-loss circuit is formed in parallel by main frame tool switch (hereinafter to be referred as main switch) and disjunction branch road; Disjunction is propped up route electric current Sensitive Apparatus, diode circuit and auxiliary switch and is in series; Low-loss circuit is connected in the supply line and uses, and in the alternating current circuit, forms after two diode reverse parallel connections of diode electrically route; In DC line; Can use to exchange interior circuit, also can be made up of a diode, the connection polarity of this diode should allow through the circuit direct current; Pressure drop when the diode circuit in the disjunction branch road is used for offsetting the main switch closure on the contact resistance, no current flows through the disjunction branch road when guaranteeing the main switch closure; When circuit was connected, main switch was in closure state, owing to have diode circuit in the disjunction branch road, the disjunction branch road does not have electric current to pass through, and carries whole line currents by main switch, and the auxiliary switch state is any, and the regulation auxiliary switch is in off-state; When needs disjunction circuit, at first closed auxiliary switch breaks off main switch again; In main switch disconnection process, because its contact contact resistance becomes big, switch ends voltage is greater than the diode circuit pressure drop; Disjunction branch road line attachment has electric current to flow through in the electric current Sensitive Apparatus; The electric current Sensitive Apparatus is specifically responsible for the disconnection of line current or is fallen the stream task in Low-loss circuit; Should have non-linear rheostat characteristic, initial resistance is little, when flowing through wherein electric current much larger than its operating current; The resistance sudden change; Be high resistant or fusing, the electric current Sensitive Apparatus also should have suitable action speed, bear before making that main switch is reliable and breaking off, flow through the voltage that forms after that the disjunction branch road produces, disjunction branch road and the load dividing potential drop by line current and be significantly less than the electric power system rated operational voltage; Then in the shunting of disjunction branch road, dividing potential drop environment, stream, step-down disjunction fall in main switch self; Electric current Sensitive Apparatus operating current will be much smaller than the rated operational current of circuit; The circuit running current is as far as the electric current Sensitive Apparatus; It is exactly a kind of overcurrent; The electric current Sensitive Apparatus is answered action message when flowing through the circuit running current, its equivalent resistance is high resistant or fusing, makes that stream or vanishing fall in the load current on this circuit; On the sequential, auxiliary switch just can break off after electric current Sensitive Apparatus action is accomplished, auxiliary switch only need break off much smaller than the circuit rated operational current, the residual current behind the stream falls by the electric current Sensitive Apparatus.
2. Low-loss circuit according to claim 1 is characterized in that:
In the disjunction branch road diode circuit is set, has eliminated operating personnel's human factor, guaranteed that the through-flow zero hour of disjunction branch road and main switch disjunction are synchronous the zero hour.
3. Low-loss circuit according to claim 2 is characterized in that:
The electric current Sensitive Apparatus can adopt existing over-current protection device to realize.
4. Low-loss circuit according to claim 3 is characterized in that:
The initial resistance of electric current Sensitive Apparatus is enough little and have an onset late effect in the disjunction branch road; Time of delay is greater than the disjunction operate time of main switch; Guarantee before the reliable disconnection of main switch; Be parallel to the arcing voltage threshold values of the disjunction Zhi Luduan pressure value at main switch two ends less than main switch, make main switch that whole line currents are transferred to the disjunction branch road after, no arc breaks off under the condition of voltage less than the arcing voltage threshold values; The operating current of electric current Sensitive Apparatus is much smaller than the rated operational current of circuit; The regular link operating current is a kind of serious overcurrent as far as the electric current Sensitive Apparatus, and electric current Sensitive Apparatus action message under this serious overcurrent effect is after one period operate time; Its equivalent resistance becomes enough big or fuses; Make the circuit residual current less than mechanical auxiliary switch striking current threshold values, on the sequential, mechanical auxiliary switch is accomplished back no arc disconnection under less than the striking current threshold values in electric current Sensitive Apparatus action.
5. device for switching according to claim 2 is characterized in that:
Should take technical measures, the misoperation of electric current Sensitive Apparatus takes place when preventing to connect circuit.
6. according to claim 4,5 described device for switching, it is characterized in that:
Adopt no arc to break off in the device for switching of Low-loss circuit and arc-control device need be set.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210214214XA CN102768915A (en) | 2012-06-27 | 2012-06-27 | Contact breaking low loss circuit and application in switch |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210214214XA CN102768915A (en) | 2012-06-27 | 2012-06-27 | Contact breaking low loss circuit and application in switch |
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| CN102768915A true CN102768915A (en) | 2012-11-07 |
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| CN201210214214XA Pending CN102768915A (en) | 2012-06-27 | 2012-06-27 | Contact breaking low loss circuit and application in switch |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108270198A (en) * | 2018-01-08 | 2018-07-10 | 西安交通大学 | A kind of direct current composite switch apparatus and method of work |
| CN111181124A (en) * | 2019-11-27 | 2020-05-19 | 广东中贝能源科技有限公司 | A kind of fault current protector and protection method |
| CN113555857A (en) * | 2021-07-02 | 2021-10-26 | 西安交通大学 | Fast fuse device based on enhanced transfer of arc voltage |
-
2012
- 2012-06-27 CN CN201210214214XA patent/CN102768915A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108270198A (en) * | 2018-01-08 | 2018-07-10 | 西安交通大学 | A kind of direct current composite switch apparatus and method of work |
| CN111181124A (en) * | 2019-11-27 | 2020-05-19 | 广东中贝能源科技有限公司 | A kind of fault current protector and protection method |
| CN113555857A (en) * | 2021-07-02 | 2021-10-26 | 西安交通大学 | Fast fuse device based on enhanced transfer of arc voltage |
| CN113555857B (en) * | 2021-07-02 | 2024-05-17 | 西安交通大学 | Quick fusing device based on arc voltage enhanced transfer |
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Application publication date: 20121107 |