CN104953535A - Breaking circuit and active type breaking protection device applying same - Google Patents
Breaking circuit and active type breaking protection device applying same Download PDFInfo
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- CN104953535A CN104953535A CN201510387585.1A CN201510387585A CN104953535A CN 104953535 A CN104953535 A CN 104953535A CN 201510387585 A CN201510387585 A CN 201510387585A CN 104953535 A CN104953535 A CN 104953535A
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- disconnecting apparatus
- overcurrent
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- breaking
- deenergizing
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Abstract
The invention discloses a breaking circuit and an active type breaking protection device applying the same. The breaking circuit comprises a controllable disconnecting device and an overcurrent automatic disconnecting device, wherein a control end of the controllable disconnecting device is connected with a breaking controller; the overcurrent automatic disconnecting device is connected in parallel with the controllable disconnecting device. When no short circuit fault happens in a photovoltaic system, the controllable disconnecting device bears current; when a short circuit fault occurs in the photovoltaic system, the controllable disconnecting device is disconnected under low breaking voltage, so that current is transferred to the overcurrent automatic disconnecting device, and the low-current overcurrent automatic disconnecting device breaks fault current basically equivalent to normal working current. Reliable breakage of the short circuit fault in the photovoltaic system can be realized, the reaction is sensitive, the accuracy is high, the structure is simple, the cost is low, the size is small, and popularization and application are facilitated.
Description
Technical field
The present invention relates to photovoltaic system failure protection techniques field, particularly relate to a kind of point of deenergizing and apply the active disjunction protective device of this circuit.
Background technology
Existing photovoltaic system generally adopts fuse or circuit breaker as error protection means, and traditional insurance silk or circuit breaker are passive protection device, and operating current is generally the several times of rated operational current., the short circuit current of photovoltaic battery panel is less, is only a bit several times of its running current.Obviously, fuse and circuit breaker cannot effective disjunction fault currents, and the fault that initiatively disjunction can only be adopted to complete photovoltaic system departs from.Tradition initiatively break-up device is all receive external control signal, then just disconnects.But; photovoltaic panel voltage normally high voltage direct current in photovoltaic system; the active disjunction protective device commonly used comprises direct current relay, D.C. contactor, DC circuit breaker coordinate inner shunt release or electricity behaviour etc.; not only complex structure; and the break volume of device of the high voltage direct flow point such as direct current relay, D.C. contactor, DC circuit breaker is large, expensive.The disjunction of direct current is different from interchange, and alternating current exists the zero crossing of electric current and voltage, and contactor/relay etc. can at zero crossing arc extinguishing, reliable breaking current then.And direct current does not have the zero crossing of voltage or electric current, the cost of disjunction direct current is high, is not easy to apply.
Summary of the invention
The object of the invention is to, by a kind of point of deenergizing and the active disjunction protective device applying this circuit, solve the problem that above background technology part is mentioned.
For reaching this object, the present invention by the following technical solutions:
A kind of point of deenergizing, this circuit comprise can controlled can disconnecting apparatus and the automatic disconnecting apparatus of overcurrent; Described can controlled can disconnecting apparatus control end connect breaking control device; The automatic disconnecting apparatus of described overcurrent with can controlledly can be connected in parallel by disconnecting apparatus.
Especially, describedly controlledly can to select but be not limited to any one of AC relay, A.C. contactor or AC circuit breaker by disconnecting apparatus.
Especially, the automatic disconnecting apparatus of described overcurrent select but be not limited to circuit breaker or DC fuse any one.
Especially, describedly controlledly magnetic latching relay can be selected by disconnecting apparatus.
The invention also discloses a kind of active disjunction protective device applying above-mentioned point of deenergizing, this device comprises for the short trouble testing circuit of photovoltaic system, breaking control device and point deenergizing; Described point of deenergizing comprise can controlled can disconnecting apparatus and the automatic disconnecting apparatus of overcurrent, the automatic disconnecting apparatus of overcurrent with can controlledly can be connected in parallel by disconnecting apparatus; Described short trouble testing circuit is electrically connected with breaking control device, detects in photovoltaic system whether there is short trouble; Described breaking control device connect can controlled can the control end of disconnecting apparatus, short trouble testing circuit detect in photovoltaic system be short-circuited fault time, export pulse command to can controlled can disconnecting apparatus, make controlledly can to disconnect by disconnecting apparatus.
Especially, described can controlled can disconnecting apparatus adopt magnetic latching relay; The automatic disconnecting apparatus of described overcurrent selects DC fuse.
Point deenergizing that the present invention proposes and apply the active disjunction protective device employing AC relay of this circuit, A.C. contactor or AC circuit breaker etc. controlledly the disconnecting apparatus mode in parallel with the automatic disconnecting apparatus of the overcurrent such as circuit breaker or DC fuse can realize the active disjunction of short trouble of photovoltaic system, when there is not short trouble in photovoltaic system, by controlledly can bearing electric current by disconnecting apparatus, during the fault that is short-circuited in photovoltaic system, can controlledly can disconnect under low disjunction voltage by disconnecting apparatus, thus by current transfer on the automatic disconnecting apparatus of overcurrent, the fault current going disjunction substantially suitable with running current size by the automatic disconnecting apparatus of the overcurrent of small area analysis.The invention solves tradition initiatively break-up device complex structure, cost is high, volume is large, and be used alone AC relay, A.C. contactor etc., although the low volume of cost is little, but can not effectively disjunction high voltage direct current, although and fuse can disjunction direct current, the problem that external control instruction disconnects cannot be accepted.The present invention can realize the reliable disjunction of short trouble in photovoltaic system, and be quick on the draw, accuracy rate is high, and structure is simple, and cost is low, and volume is little, is easy to apply.
Accompanying drawing explanation
The disjunction circuit structure diagram that Fig. 1 provides for the embodiment of the present invention;
The active disjunction protective device structure chart that Fig. 2 provides for the embodiment of the present invention.
Embodiment
Below in conjunction with drawings and Examples, the invention will be further described.Be understandable that, specific embodiment described herein is only for explaining the present invention, but not limitation of the invention.It also should be noted that, for convenience of description, illustrate only part related to the present invention in accompanying drawing but not full content.Unless otherwise defined, all technology used herein and scientific terminology are identical with belonging to the implication that those skilled in the art of the present invention understand usually.The object of term used in the description of the invention herein just in order to describe specific embodiment, is not intended to be restriction the present invention.Term as used herein " and/or " comprise arbitrary and all combinations of one or more relevant Listed Items.
Please refer to shown in Fig. 1, in the present embodiment point deenergizing 101 specifically comprise can controlled can disconnecting apparatus 1011 and the automatic disconnecting apparatus 1012 of overcurrent.Described can controlled can disconnecting apparatus 1011 control end connect breaking control device.The automatic disconnecting apparatus of described overcurrent 1012 with can controlledly can be connected in parallel by disconnecting apparatus 1011.It should be noted that, described can controlled can disconnecting apparatus 1011 can select but be not limited to AC relay, A.C. contactor, AC circuit breaker any one, or low voltage DC relay etc. is any can the switch of controlled disconnection.The automatic disconnecting apparatus 1012 of described overcurrent is selected but is not limited to any one of circuit breaker or DC fuse, can be replaced anyly to be greater than the protection device that certain value can disconnect automatically when electric current.Controlledly magnetic latching relay can be adopted by disconnecting apparatus 1011 in the present embodiment.The automatic disconnecting apparatus 1012 of described overcurrent selects DC fuse.
As shown in Figure 2, the active disjunction protective device applying above-mentioned point of deenergizing 101 in the present embodiment specifically comprises for the short trouble testing circuit 201 of photovoltaic system, breaking control device 202 and point deenergizing 101.Described point of deenergizing 101 comprise can controlled can disconnecting apparatus 1011 and the automatic disconnecting apparatus 1012 of overcurrent, the automatic disconnecting apparatus of overcurrent 1012 with can controlledly can be connected in parallel by disconnecting apparatus 1011.Described can controlled can disconnecting apparatus 1011 can select but be not limited to AC relay, A.C. contactor, AC circuit breaker any one, or low voltage DC relay etc. is any can the switch of controlled disconnection.The automatic disconnecting apparatus 1012 of described overcurrent is selected but is not limited to any one of circuit breaker or DC fuse, can be replaced anyly to be greater than the protection device that certain value can disconnect automatically when electric current.Controlledly magnetic latching relay can be adopted by disconnecting apparatus 1011 in the present embodiment.The automatic disconnecting apparatus 1012 of described overcurrent selects DC fuse.
Described short trouble testing circuit 201 is electrically connected with breaking control device 202, for detecting in photovoltaic system whether there is short trouble.The fault detect means of described short trouble testing circuit 201 can adopt any one of following several scheme: one be electric current, voltage sample combines, when magnitude of voltage is significantly lower than normal value, and there is continuous current, be judged to be that short trouble occurs.Two is adopt Voltage Drop to judge, in the short time, significantly drop occurs (being generally ms magnitude) voltage, can be judged as catastrophe failures such as being short-circuited.Three is adopt current spectrum analysis, and when there is the faults such as arcing, electric current exists specific frequency spectrum, can judge arcing fault whereby.It should be noted that, the specific implementation of described short trouble testing circuit 201 has multiple, and those of ordinary skill in the art can flexible design as required, therefore its particular circuit configurations does not repeat them here.Described breaking control device 202 connect can controlled can the control end of disconnecting apparatus 1011, when being short-circuited fault for detecting in photovoltaic system at short trouble testing circuit 201, export pulse command to can controlled can disconnecting apparatus 1011, make controlledly can to disconnect by disconnecting apparatus 1011.
For photovoltaic combiner box branch road, the present invention is specifically described below.Controlledly can adopt magnetic latching relay by disconnecting apparatus 1011.The automatic disconnecting apparatus 1012 of overcurrent selects DC fuse.Magnetic latching relay and DC fuse are connected in parallel.Current-carrying effect under normal circumstances mainly born by magnetic latching relay; The rated current of DC fuse is much smaller than running current, and DC fuse serves as the effect of disjunction fault current.During work, when short trouble testing circuit 201 does not detect short trouble, magnetic latching relay remains closed situation.Because magnetic latching relay conducting resistance is much smaller than DC fuse, therefore photovoltaic battery panel output current substantially all flows through magnetic latching relay, does not almost have conduction loss.When short trouble testing circuit 201 detects that photovoltaic battery panel branch road breaks down, breaking control device 202 issues control command allows magnetic latching relay disconnect.Now fault current transfers to DC fuse branch road from magnetic latching relay, and because DC fuse continues conducting, the two ends of magnetic latching relay continue to maintain low-voltage.Relay belongs to no-voltage and disconnects, and there is not the arc extinguishing problem of high voltage direct current, therefore can adopt the low cost devices such as magnetic latching relay.Because the rated current of DC fuse is much smaller than branch current during normal work, DC fuse fuses after constant conduction a period of time.DC fuse disjunction fault current, must adopt high voltage direct current fuse, to ensure the reliable disjunction of fault current.
Such as, electric current when photovoltaic battery panel normally works is between 1 ~ 10A, and the opening voltage of photovoltaic battery panel is 1000VDC, traditionally can select rated current 15A, the DC fuse of withstand voltage 1000VDC.If DC fuse electric equipment below (may be header box, also may be inverter) is short-circuited, because the characteristic of photovoltaic battery panel is very soft, the electric current after short circuit may also just between 0 ~ 11A, and DC fuse can not disconnect.The catching fire of header box or inverter may be caused like this.And after adopting provided by the invention point of deenergizing, DC fuse can select DC fuse (or the rated voltage 1000VDC of the withstand voltage 1000V of rated current 1A, the circuit breaker possessing thermo magnetic trip release function of rated current 2A), a rated current 15A in parallel on DC fuse, (this relay disconnects between rear contact withstand voltagely can meet 1000VDC to the magnetic latching relay of withstand voltage 250VAC or 24VDC, but can not disjunction in 1000VDC situation) or one possess shunted exciter tripping function circuit breaker, energy disjunction 24VDC, rated current 15A, it just can disjunction immediately to possessing shunted exciter tripping function circuit breaker signal for external device (ED).Header box after this point of deenergizing or inverter are short-circuited after fault, short trouble testing circuit detects, thus breaking control device output pulse command reverses by magnetic latching relay state, become off-state, now due to a magnetic latching relay two ends DC fuse in parallel, can not more than 24VDC at the voltage at the process repeat circuit two ends of magnetic latching relay disjunction, after magnetic latching relay disconnects, fault current can be transferred on the DC fuse of 1A, now, as long as fault current is greater than 1A, DC fuse will disconnect, and then improve the security performance of photovoltaic battery panel, compare again tradition initiatively break-up device employing direct current relay or D.C. contactor simultaneously, significantly reduce cost.For photovoltaic system, short circuit current after fault is usual and rated current is similar, even under the poor condition of illumination, short circuit current even can lower than its rated current, if so the simple fuse only adopting 1000VDC 12A or 15A traditionally, although fuse not misoperation when can ensure normally to work, but once this fuse also can not action after rear terminal shortcircuit, after adopting the solution of the present invention, both reduced cost, in turn ensure that safe disconnection.
Technical scheme of the present invention adopts AC relay, A.C. contactor or AC circuit breaker etc. controlledly the disconnecting apparatus mode in parallel with the automatic disconnecting apparatus of the overcurrent such as circuit breaker or DC fuse can realize the active disjunction of short trouble of photovoltaic system, when there is not short trouble in photovoltaic system, by controlledly can bearing electric current by disconnecting apparatus, during the fault that is short-circuited in photovoltaic system, can controlledly can disconnect under low disjunction voltage by disconnecting apparatus, thus by current transfer on the automatic disconnecting apparatus of overcurrent, the fault current going disjunction substantially suitable with running current size by the automatic disconnecting apparatus of the overcurrent of small area analysis.The invention solves tradition initiatively break-up device complex structure, cost is high, and volume is large, and although the low volume of the cost such as AC relay, A.C. contactor is little, but can not effectively disjunction high voltage direct current, although fuse can disjunction direct current, the problem that external control instruction disconnects cannot be accepted.The present invention can realize the reliable disjunction of short trouble in photovoltaic system, and be quick on the draw, accuracy rate is high, and structure is simple, and cost is low, and volume is little, is easy to apply.
Note, skilled person in the art will appreciate that and the invention is not restricted to specific embodiment described here, various obvious change can be carried out for a person skilled in the art, readjust and substitute and can not protection scope of the present invention be departed from.Therefore, although be described in further detail invention has been by above embodiment, the present invention is not limited only to above embodiment, when not departing from the present invention's design, can also comprise other Equivalent embodiments more, and scope of the present invention is determined by appended right.
Claims (6)
1. a point deenergizing, is characterized in that, this circuit comprise can controlled can disconnecting apparatus and the automatic disconnecting apparatus of overcurrent; Described can controlled can disconnecting apparatus control end connect breaking control device; The automatic disconnecting apparatus of described overcurrent with can controlledly can be connected in parallel by disconnecting apparatus.
2. according to claim 1 point of deenergizing, is characterized in that, describedly controlledly can select but be not limited to any one of AC relay, A.C. contactor or AC circuit breaker by disconnecting apparatus.
3. according to claim 1 point of deenergizing, is characterized in that, the automatic disconnecting apparatus of described overcurrent is selected but is not limited to any one of circuit breaker or DC fuse.
4. point deenergizing according to any one of Claims 2 or 3, is characterized in that, describedly controlledly can select magnetic latching relay by disconnecting apparatus.
5. application rights requires an active disjunction protective device for point deenergizing described in 1, it is characterized in that, this device comprises for the short trouble testing circuit of photovoltaic system, breaking control device and point deenergizing; Described point of deenergizing comprise can controlled can disconnecting apparatus and the automatic disconnecting apparatus of overcurrent, the automatic disconnecting apparatus of overcurrent with can controlledly can be connected in parallel by disconnecting apparatus; Described short trouble testing circuit is electrically connected with breaking control device, detects in photovoltaic system whether there is short trouble; Described breaking control device connect can controlled can the control end of disconnecting apparatus, short trouble testing circuit detect in photovoltaic system be short-circuited fault time, export pulse command to can controlled can disconnecting apparatus, make controlledly can to disconnect by disconnecting apparatus.
6. active disjunction protective device according to claim 3, is characterized in that, described can controlled can disconnecting apparatus adopt magnetic latching relay; The automatic disconnecting apparatus of described overcurrent selects DC fuse.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510387585.1A CN104953535A (en) | 2015-06-30 | 2015-06-30 | Breaking circuit and active type breaking protection device applying same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510387585.1A CN104953535A (en) | 2015-06-30 | 2015-06-30 | Breaking circuit and active type breaking protection device applying same |
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| Publication Number | Publication Date |
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| CN104953535A true CN104953535A (en) | 2015-09-30 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201510387585.1A Pending CN104953535A (en) | 2015-06-30 | 2015-06-30 | Breaking circuit and active type breaking protection device applying same |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106026229A (en) * | 2016-05-27 | 2016-10-12 | 宁德时代新能源科技股份有限公司 | Shunting device and working method thereof |
| CN113826302A (en) * | 2020-04-13 | 2021-12-21 | 华为数字能源技术有限公司 | Protection device and protection method of photovoltaic power generation system and photovoltaic power generation system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201243191Y (en) * | 2008-08-08 | 2009-05-20 | 安徽赛普电气有限公司 | Large-capacity high-speed current-limiting switch device |
| CN101902027A (en) * | 2009-09-04 | 2010-12-01 | 中国人民解放军海军工程大学 | Arc striking type mixing current limiting fuse |
| CN204886123U (en) * | 2015-06-30 | 2015-12-16 | 无锡上能新能源有限公司 | Disconnected protection device of active branch who divides breaking of contact and applied this circuit |
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2015
- 2015-06-30 CN CN201510387585.1A patent/CN104953535A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201243191Y (en) * | 2008-08-08 | 2009-05-20 | 安徽赛普电气有限公司 | Large-capacity high-speed current-limiting switch device |
| CN101902027A (en) * | 2009-09-04 | 2010-12-01 | 中国人民解放军海军工程大学 | Arc striking type mixing current limiting fuse |
| CN204886123U (en) * | 2015-06-30 | 2015-12-16 | 无锡上能新能源有限公司 | Disconnected protection device of active branch who divides breaking of contact and applied this circuit |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106026229A (en) * | 2016-05-27 | 2016-10-12 | 宁德时代新能源科技股份有限公司 | Shunting device and working method thereof |
| CN113826302A (en) * | 2020-04-13 | 2021-12-21 | 华为数字能源技术有限公司 | Protection device and protection method of photovoltaic power generation system and photovoltaic power generation system |
| US11870238B2 (en) | 2020-04-13 | 2024-01-09 | Huawei Digital Power Technologies Co., Ltd. | Protection apparatus and protection method for photovoltaic power generation system |
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Address after: 214174 Jiangsu Province Economic Development Zone, Huishan wind power science and Technology Industrial Park, wind energy road, No. 1 standard factory building Applicant after: SINENG ELECTRIC Co.,Ltd. Address before: 214174 Jiangsu Province Economic Development Zone, Huishan wind power science and Technology Industrial Park, wind energy road, No. 1 standard factory building Applicant before: Top energy Electric Co.,Ltd. Address after: 214174 Jiangsu Province Economic Development Zone, Huishan wind power science and Technology Industrial Park, wind energy road, No. 1 standard factory building Applicant after: Top energy Electric Co.,Ltd. Address before: 214174 Jiangsu Province Economic Development Zone, Huishan wind power science and Technology Industrial Park, wind energy road, No. 1 standard factory building Applicant before: WUXI SINENG NEW ENERGY CO.,LTD. |
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Application publication date: 20150930 |
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