CN104241057A - Arc-free breaking device and method of low-voltage direct-current circuit breaker - Google Patents
Arc-free breaking device and method of low-voltage direct-current circuit breaker Download PDFInfo
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- CN104241057A CN104241057A CN201410444702.9A CN201410444702A CN104241057A CN 104241057 A CN104241057 A CN 104241057A CN 201410444702 A CN201410444702 A CN 201410444702A CN 104241057 A CN104241057 A CN 104241057A
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Abstract
The invention provides an arc-free breaking device and method of a low-voltage direct-current circuit breaker. As the shunt principle is adopted, a main contact of the circuit breaker does not need to undertake the task of breaking a large-amplitude direct current, the breaking capacity of the circuit breaker is indirectly improved, and the service life of the circuit breaker is prolonged. A shunt electronic assembly is formed by connecting a PTC thermistor and a constant resistor of 1 ohm in series, and the current of the shunt electronic assembly is within a small amplitude range after the shunt electronic assembly is put into operation according to the characteristic, so that a whole loop is broken more easily. When the breaker breaks a short-circuit fault current, a current-limiting resistor effectively ensures that the current exerted on the shunt electronic assembly is within the allowed range and then ensures that the shunt electronic assembly can effectively break the short-circuit current without being damaged.
Description
Technical field
Apparatus of the present invention and method belong to DC circuit breaker arc extinguishing field, be a kind of utilize shunting principle and the low-voltage direct circuit breaker designed without electric arc breaking device and method.
Background technology
The continuous change of present stage direct current transportation scale is large, the appearance of multi-terminal direct current transmission system will be inevitable development trend, therefore, in DC engineering from now on, adopt DC circuit breaker to be an important technology innovation, DC circuit breaker is by equipment indispensable in multiterminal element electrical network after becoming, and arc extinguishing technology is the core topic of circuit breaker research field.In AC transmission system, electric current each cycle has 2 natural zero-crossing points, and AC circuit breaker makes full use of this machine exactly and carries out extinguish arcs, completes medium recovery; And direct current system does not exist natural zero-crossing point, therefore, DC circuit cut-off more difficult.Direct current cut-offs sixty-four dollar question, is will adopt an effective measure to allow breaking direct current create zero crossing, makes arc current be reduced to zero, so that extinguish arcs.
The most frequently used method is exactly reverse voltage method, but this arc-suppressing method inevitably also exists the loss of contact and arc-chute, and in order to maintain its reliability, then needs to carry out continually safeguarding and check.In addition, owing to needing large arc gap and flashover distance and being difficult to miniaturization.
Summary of the invention
The technical problem that this method will solve is: solve existing Arc-extinguishing Devices of DC Circuit Breakers and produce strong electric arc because arc extinguishing is indifferent when high-current on-off, thus the life-span reducing circuit breaker itself even burns out the problem of contact.This method is characteristic based on nonlinear resistance and the DC circuit breaker the designed method of cut-offfing without arc, the electric arc of DC circuit breaker when cut-offfing is reduced by the shunting of circuit and the current limiting capacity of nonlinear resistance, to realize Arc-free cut-offfing, finally reach and improve DC circuit breaker pitch capability and the object in life-span.
Concrete technical scheme is as follows:
A kind of low-voltage direct circuit breaker, without electric arc breaking device, is characterized in that described device comprises: reverse-blocking tetrode thyristor, shunting electronic building brick, IGBT, current-limiting resistance, triggering and breaking circuit plate, time relay circuit; Described time relay circuit comprises the time relay, switch, a control circuit, and control circuit is connected with shunt assembly; A described switch in parallel is in reverse-blocking tetrode thyristor; Reverse-blocking tetrode thyristor anode connector is connected with shunting electronic building brick positive pole, and reverse-blocking tetrode thyristor control interface is connected with the control circuit of time relay circuit; Described triggering and breaking circuit partitioned signal output are connected with IGBT, and described IGBT is parallel to current-limiting resistance; Shunting electronic building brick negative pole is connected with current-limiting resistance positive pole; Described shunt assembly is in series by N group electronic building brick, and described electronic building brick is formed by M bar electronic building brick branch circuit parallel connection, and described electronic building brick branch road comprises 1 macromolecular thermosensitive resistor PTC, 1 constant value resistance, described thermistor and constant value resistant series.
Described low-voltage direct circuit breaker without electric arc breaking device shunt assembly, the electronic building brick group number M that it comprises and the maximum electric current I of rationing the power supply of circuit breaker
max,macromolecular thermosensitive resistor PTC is maximum passes through electric current I
pTCpass be M=I
max/ I
ptc.
Described low-voltage direct circuit breaker without electric arc breaking device electronic building brick, the electronic building brick branch road number N that it comprises and circuit breaker maximum limit piezoelectric voltage V
max, macromolecular thermosensitive resistor PTC maximum voltage V
ptcpass be N=V
max/ V
ptc.
Described low-voltage direct circuit breaker is without electric arc breaking device electronic building brick branch road, and the constant value resistance that it comprises is 1 ohm.
A kind of low-voltage direct circuit breaker, without electric arc cutoff method, adopts above-mentioned any one low-voltage direct circuit breaker without electric arc breaking device, it is characterized in that said method comprising the steps of:
When circuit breaker needs to disconnect in normal state
Step 1, circuit breaker disconnects, time relay circuit release first time pulse, and because the mechanical action time of circuit breaker is long, the control circuit therefore in time relay circuit sends reverse-blocking tetrode thyristor triggering signal, conducting reverse-blocking tetrode thyristor, namely shunts electronic building brick and first drops into circuit; Normal cut-off signal transfers to IGBT by triggering and breaking circuit plate, and IGBT connects circuit makes current-limiting resistance be in short-circuit condition;
Step 2, for the first time end-of-pulsing, control circuit disconnects, and reverse-blocking tetrode thyristor triggering signal is removed; The macromolecular thermosensitive resistor now shunted in electronic building brick arrives high resistant, and in circuit, electric current is very little, but being still greater than silicon controlled maintains electric current, therefore must add and turn off silicon controlled circuit;
Step 3, the pulse of time relay circuit release second time, a switch closes, and circuital current is directly by a switch, and reverse-blocking tetrode thyristor short circuit also turns off;
Step 4, time relay circuit second time end-of-pulsing, a switch disconnects, and completes the switching process of shunting electronic building brick, because the input shunting electronic building brick makes circuital current reduce, reaches breaker circuit and disconnects object without electric arc;
When circuit breaker needs to disconnect in the short-circuit state
Step 1., circuit breaker disconnects, time relay circuit release first time pulse, and because the mechanical action time of circuit breaker is long, the control circuit therefore in time relay circuit sends reverse-blocking tetrode thyristor triggering signal, conducting reverse-blocking tetrode thyristor, namely shunts electronic building brick and first drops into circuit;
Short circuit cut-off signal transfers to IGBT by triggering and breaking circuit plate; IGBT circuit disconnects, and makes current-limiting resistance be in normal place in circuit state, ensures that short circuit current is no more than that circuit breaker is maximum passes through electric current;
Step 2., first time end-of-pulsing, control circuit disconnect, reverse-blocking tetrode thyristor triggering signal remove; The macromolecular thermosensitive resistor now shunted in electronic building brick arrives high resistant, and in circuit, electric current is very little, but being still greater than silicon controlled maintains electric current, therefore must add and turn off silicon controlled circuit;
3., time relay circuit discharges second time pulse to step, and a switch closes, and circuital current is directly by a switch, and reverse-blocking tetrode thyristor short circuit also turns off;
4., time relay circuit second time end-of-pulsing, a switch disconnects step, completes the switching process of shunting electronic building brick, because the input shunting electronic building brick makes circuital current reduce, reaches breaker circuit and disconnects object without electric arc.
Beneficial effect:
1. the low-voltage direct circuit breaker that proposes of the present invention to solve in prior art Arc-extinguishing Devices of DC Circuit Breakers when high-current on-off without electric arc breaking device and method and produces strong electric arc because arc extinguishing is indifferent, thus the life-span reducing circuit breaker itself even burns out the problem of contact, useful life and the fail safe of DC circuit breaker significantly can be strengthened;
2. the low-voltage direct circuit breaker that proposes of the present invention solves DC circuit breaker in prior art without electric arc breaking device and method needs large arc gap and flashover distance and is difficult to miniaturized problem, and do not need to safeguard frequently and check, more easy to use and installation;
3. the low-voltage direct circuit breaker that the present invention proposes have employed the principle of shunting without electric arc breaking device and method, make circuit breaker main contact not need to bear the task of disjunction amplitude direct current, thus indirectly improve the breaking capacity of circuit breaker itself;
4. the low-voltage direct circuit breaker of the present invention's proposition is without electric arc breaking device and method, wherein electronic building brick branch road adopts the constant value resistant series composition of macromolecular thermosensitive resistor and 1 ohm, make the electric current of electronic building brick branch road in very little amplitude range after putting into operation according to its characteristic, make circuit breaker more easily cut off whole loop.When circuit breaker trip short-circuit current, current-limiting resistance effectively ensure that electric current that electronic building brick bears in allowed limits, and then ensure that electronics branch road can effectively be unlikely to damage electronic building brick by cutting-off of short-circuit electric current;
5. the low-voltage direct circuit breaker that the present invention proposes is installed simple without electric arc breaking device assembly, on the basis reducing circuit breaker breaking capability, reduce manufacturing cost and the operation of whole device, be conducive to large-scale production and application.
Accompanying drawing explanation
Fig. 1 is the syndeton schematic diagram of apparatus of the present invention.
Embodiment
For making object of the invention process, technical scheme and advantage clearly, below in conjunction with accompanying drawing, the technical scheme in the invention process is clearly and completely described:
Low-voltage direct circuit breaker as shown in Figure 1, without electric arc breaking device, comprising: reverse-blocking tetrode thyristor 1, shunting electronic building brick 2, IGBT 3, current-limiting resistance 4, triggering and breaking circuit plate 5, time relay circuit 6; Described time relay circuit comprises a switch 7, control circuit 8, and control circuit 8 is connected with shunt assembly 2; A described switch 7 is parallel to reverse-blocking tetrode thyristor 3; Reverse-blocking tetrode thyristor 3 anode connector is connected with shunting electronic building brick 2 positive pole, and reverse-blocking tetrode thyristor control interface is connected with the control circuit of time relay circuit 6; Described triggering and breaking circuit plate 5 signal output part are connected with IGBT 3, and described IGBT 3 is parallel to current-limiting resistance 4; Shunting electronic building brick 2 negative pole is connected with current-limiting resistance 4 positive pole; Described shunt assembly 2 is in series by N group electronic building brick 2-1 ~ 2-n, described electronic building brick is formed by M bar electronic building brick branch circuit parallel connection, described electronic building brick branch road comprises 1 macromolecular thermosensitive resistor PTC, 1 constant value resistance R1, described thermistor and constant value resistant series.
Described low-voltage direct circuit breaker without electric arc breaking device shunt assembly 2, the electronic building brick group number M that it comprises and the maximum electric current I of rationing the power supply of circuit breaker
max,macromolecular thermosensitive resistor PTC is maximum passes through electric current I
pTCpass be M=I
max/ I
ptc.
Described low-voltage direct circuit breaker without electric arc breaking device electronic building brick, the electronic building brick branch road number N that it comprises and circuit breaker maximum limit piezoelectric voltage V
max, macromolecular thermosensitive resistor PTC maximum voltage V
ptcpass be N=V
max/ V
ptc.
Described low-voltage direct circuit breaker is without electric arc breaking device electronic building brick branch road, and the constant value resistance that it comprises is 1 ohm.
Suppose that the specification of circuit breaker is 220V, 60A; Macromolecular thermosensitive resistor specification is 110V, 30A; Then m=60A/30A=2, n=220V/110V=2; Whole device is installed on the main contact place of circuit breaker in parallel.
When circuit breaker needs to disconnect in normal state:
Circuit breaker disconnects, time relay circuit 6 discharges first time pulse, because the mechanical action time of circuit breaker is long, therefore the control circuit 6-1 in time relay circuit 6 sends reverse-blocking tetrode thyristor triggering signal, conducting reverse-blocking tetrode thyristor 1, namely shunts electronic building brick 2 and first drops into circuit; Normal cut-off signal is by trigger and breaking circuit plate 5 transfers to IGBT 3, IGBT 3 and connects circuit and make current-limiting resistance 4 be in short-circuit condition;
End-of-pulsing for the first time, control circuit 6-1 disconnects, and reverse-blocking tetrode thyristor triggering signal is removed; The macromolecular thermosensitive resistor now shunted in electronic building brick 2 arrives high resistant, and in circuit, electric current is very little, but is still greater than the maintenance electric current of reverse-blocking tetrode thyristor 1, therefore must add and turn off silicon controlled circuit;
Time relay circuit 6 discharges second time pulse, and a switch 6-2 closes, and circuital current is directly by a switch 6-2, and reverse-blocking tetrode thyristor 1 short circuit also turns off;
Time relay circuit second time end-of-pulsing, a switch 6-2 disconnects, and completes the switching process of shunting electronic building brick 2, because the input shunting electronic building brick 2 makes circuital current reduce, reaches breaker circuit and disconnects object without electric arc;
When circuit breaker needs to disconnect in the short-circuit state:
Circuit breaker disconnects, time relay circuit 6 discharges first time pulse, because the mechanical action time of circuit breaker is long, therefore the control circuit 6-1 in time relay circuit 6 sends reverse-blocking tetrode thyristor triggering signal, conducting reverse-blocking tetrode thyristor 1, namely shunts electronic building brick 2 and first drops into circuit; Short circuit cut-off signal transfers to IGBT 3 by triggering and breaking circuit plate 5; IGBT 3 open-circuit line, makes current-limiting resistance 4 be in normal place in circuit state, ensures that short circuit current is no more than that circuit breaker is maximum passes through electric current;
End-of-pulsing for the first time, control circuit 6-1 disconnects, and reverse-blocking tetrode thyristor triggering signal is removed; The macromolecular thermosensitive resistor now shunted in electronic building brick 2 arrives high resistant, and in circuit, electric current is very little, but is still greater than the maintenance electric current of reverse-blocking tetrode thyristor 1, therefore must add and turn off silicon controlled circuit;
Time relay circuit 6 discharges second time pulse, and a switch 6-2 closes, and circuital current is directly by a switch 6-2, and reverse-blocking tetrode thyristor 1 short circuit also turns off;
Time relay circuit second time end-of-pulsing, a switch 6-2 disconnects, and completes the switching process of shunting electronic building brick 2, because the input shunting electronic building brick 2 makes circuital current reduce, reaches breaker circuit and disconnects object without electric arc.
These apparatus and method have employed the principle of shunting, make circuit breaker main contact not need to bear the task of disjunction amplitude direct current, thus indirectly improve breaking capacity and the useful life of circuit breaker itself.Shunting electronic building brick adopts the constant value resistant series composition of PTC thermistor and 1 ohm, makes the electric current of shunting electronic building brick very little amplitude range in after putting into operation according to its characteristic, makes more easily to cut off whole loop.When circuit breaker trip short-circuit current, current-limiting resistance 4 effectively ensure that the electric current that bears of shunting electronic building brick 2 in allowed limits, and then ensure that shunting electronics 2 effectively can be unlikely to damage electronic building brick by cutting-off of short-circuit electric current.
Claims (5)
1. low-voltage direct circuit breaker is without an electric arc breaking device, it is characterized in that described device comprises: reverse-blocking tetrode thyristor, shunting electronic building brick, IGBT, current-limiting resistance, triggering and breaking circuit plate, time relay circuit; Described time relay circuit comprises switch, a control circuit, and control circuit is connected with shunt assembly; A described switch in parallel is in reverse-blocking tetrode thyristor; Reverse-blocking tetrode thyristor anode connector is connected with shunting electronic building brick positive pole, and reverse-blocking tetrode thyristor control interface is connected with the control circuit of time relay circuit; Described triggering and breaking circuit partitioned signal output are connected with IGBT, and described IGBT is parallel to current-limiting resistance; Shunting electronic building brick negative pole is connected with current-limiting resistance positive pole; Described shunt assembly is in series by N group electronic building brick, and described electronic building brick is formed by M bar electronic building brick branch circuit parallel connection, and described electronic building brick branch road comprises 1 macromolecular thermosensitive resistor PTC, 1 constant value resistance, described thermistor and constant value resistant series.
2. low-voltage direct circuit breaker as claimed in claim 1 is without electric arc breaking device, it is characterized in that the electronic building brick group number M that described shunt assembly comprises and the maximum electric current I of rationing the power supply of circuit breaker
max,macromolecular thermosensitive resistor PTC is maximum passes through electric current I
pTCpass be M=I
max/ I
ptc.
3. low-voltage direct circuit breaker as claimed in claim 1 is characterized in that the electronic building brick branch road number N that described electronic building brick comprises and circuit breaker maximum limit piezoelectric voltage V without electric arc breaking device
max, macromolecular thermosensitive resistor PTC maximum voltage V
ptcpass be N=V
max/ V
ptc.
4. low-voltage direct circuit breaker as claimed in claim 1 is without electric arc breaking device, and it is characterized in that described low-voltage direct circuit breaker is without electric arc breaking device electronic building brick branch road, the constant value resistance that it comprises is 1 ohm.
5. low-voltage direct circuit breaker is without an electric arc cutoff method, adopts any one low-voltage direct circuit breaker in claim 1 ~ 4 without electric arc breaking device, to it is characterized in that said method comprising the steps of:
When circuit breaker needs to disconnect in normal state:
Step 1, circuit breaker disconnects, time relay circuit release first time pulse, and because the mechanical action time of circuit breaker is long, the control circuit therefore in time relay circuit sends reverse-blocking tetrode thyristor triggering signal, conducting reverse-blocking tetrode thyristor, namely shunts electronic building brick and first drops into circuit; Normal cut-off signal transfers to IGBT by triggering and breaking circuit plate, and IGBT connects circuit makes current-limiting resistance be in short-circuit condition;
Step 2, for the first time end-of-pulsing, control circuit disconnects, and reverse-blocking tetrode thyristor triggering signal is removed; The macromolecular thermosensitive resistor now shunted in electronic building brick arrives high resistant, and in circuit, electric current is very little, but being still greater than silicon controlled maintains electric current, therefore must add and turn off silicon controlled circuit;
Step 3, the pulse of time relay circuit release second time, a switch closes, and circuital current is directly by a switch, and reverse-blocking tetrode thyristor short circuit also turns off;
Step 4, time relay circuit second time end-of-pulsing, a switch disconnects, and completes the switching process of shunting electronic building brick, because the input shunting electronic building brick makes circuital current reduce, reaches breaker circuit and disconnects object without electric arc;
When circuit breaker needs to disconnect in the short-circuit state:
Step 1., circuit breaker disconnects, time relay circuit release first time pulse, and because the mechanical action time of circuit breaker is long, the control circuit therefore in time relay circuit sends reverse-blocking tetrode thyristor triggering signal, conducting reverse-blocking tetrode thyristor, namely shunts electronic building brick and first drops into circuit;
Short circuit cut-off signal transfers to IGBT by triggering and breaking circuit plate; IGBT circuit disconnects, and makes current-limiting resistance be in normal place in circuit state, ensures that short circuit current is no more than that circuit breaker is maximum passes through electric current;
Step 2., first time end-of-pulsing, control circuit disconnect, reverse-blocking tetrode thyristor triggering signal remove; The macromolecular thermosensitive resistor now shunted in electronic building brick arrives high resistant, and in circuit, electric current is very little, but being still greater than silicon controlled maintains electric current, therefore must add and turn off silicon controlled circuit;
3., time relay circuit discharges second time pulse to step, and a switch closes, and circuital current is directly by a switch, and reverse-blocking tetrode thyristor short circuit also turns off;
4., time relay circuit second time end-of-pulsing, a switch disconnects step, completes the switching process of shunting electronic building brick, because the input shunting electronic building brick makes circuital current reduce, reaches breaker circuit and disconnects object without electric arc.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410444702.9A CN104241057A (en) | 2014-09-03 | 2014-09-03 | Arc-free breaking device and method of low-voltage direct-current circuit breaker |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410444702.9A CN104241057A (en) | 2014-09-03 | 2014-09-03 | Arc-free breaking device and method of low-voltage direct-current circuit breaker |
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| Publication Number | Publication Date |
|---|---|
| CN104241057A true CN104241057A (en) | 2014-12-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410444702.9A Pending CN104241057A (en) | 2014-09-03 | 2014-09-03 | Arc-free breaking device and method of low-voltage direct-current circuit breaker |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2135824Y (en) * | 1992-09-30 | 1993-06-09 | 杨景华 | Arcless switch equipment |
| US5886860A (en) * | 1997-08-25 | 1999-03-23 | Square D Company | Circuit breakers with PTC (Positive Temperature Coefficient resistivity |
| CN103424692A (en) * | 2013-08-28 | 2013-12-04 | 国家电网公司 | Direct-current circuit breaker on-off characteristic test method |
| CN204117895U (en) * | 2014-09-03 | 2015-01-21 | 江苏江城电气有限公司 | A kind of low-voltage direct circuit breaker is without electric arc breaking device |
-
2014
- 2014-09-03 CN CN201410444702.9A patent/CN104241057A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2135824Y (en) * | 1992-09-30 | 1993-06-09 | 杨景华 | Arcless switch equipment |
| US5886860A (en) * | 1997-08-25 | 1999-03-23 | Square D Company | Circuit breakers with PTC (Positive Temperature Coefficient resistivity |
| CN103424692A (en) * | 2013-08-28 | 2013-12-04 | 国家电网公司 | Direct-current circuit breaker on-off characteristic test method |
| CN204117895U (en) * | 2014-09-03 | 2015-01-21 | 江苏江城电气有限公司 | A kind of low-voltage direct circuit breaker is without electric arc breaking device |
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Application publication date: 20141224 |
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