CN103247998A - Electronic type low-pressure distribution transformer fuse case capable of simulating various fuse characteristic curves - Google Patents
Electronic type low-pressure distribution transformer fuse case capable of simulating various fuse characteristic curves Download PDFInfo
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- CN103247998A CN103247998A CN2013101486417A CN201310148641A CN103247998A CN 103247998 A CN103247998 A CN 103247998A CN 2013101486417 A CN2013101486417 A CN 2013101486417A CN 201310148641 A CN201310148641 A CN 201310148641A CN 103247998 A CN103247998 A CN 103247998A
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Abstract
An electronic type low-pressure distribution transformer fuse case capable of simulating various fuse characteristic curves belongs to the field of emergent protection devices, and comprises a mutual inductor group, circuit breaker switches and a control unit all arranged in a case body, wherein the control unit compares the absolute values of the load current values of various phases of a major loop or the variation trend of load current of the various phases with a settled value of an inverse-time characteristic curve of the fuse, performs the 'trip' or the 'closing' operation control for the circuit breaker switches, outwards outputs the circuit load current, the state of circuit breaker switch and internal environment parameters of the low-pressure distribution transformer fuse case in a digital signal form, remotely transmits the circuit load current, the state of circuit breaker switch and the internal environment parameters of the low-pressure distribution transformer fuse case to a host computer, and is subjected to the remote control by the host computer. The fuse case is suitable for power supply circuits of different standards of fuses, can greatly reduce the purchasing supply amount and storehouse storage of fuse products, reduces the comprehensive running cost, realizes the intelligent upgrade of products, meets the running requirements of an intelligent power grid, and can be widely applied to the field of the intelligent control of a low-pressure power transformation and distribution system.
Description
Technical field
The invention belongs to emergency protective circuit device field, relate in particular to a kind of emergency protective circuit device for low-voltage power supply and distribution system.
Background technology
Along with the raising of economic development and living standards of the people, the urban power consumption is significantly rises, and the outdoor pole transformer device of the power distribution network of city 10kV is more and more at present, and supporting with it distribution transforming fuse box use amount also increases year by year.
The low-voltage distribution transformer fuse box is that the outdoor bar of low-voltage distribution electrical network becomes one of equipment important in the device; it is installed between step-down side and the low voltage electric network; both can be used as the short circuit of low voltage electric network and the protective device of overload, and can realize the input of low voltage electric network and cut off operation by operation its " branch ", " closing " again.
The internal core of low-voltage distribution transformer fuse box is a low-tension fuse formula load-break switch, and its short circuit and overload protection adopt low pressure grid formula cartridge fuse-link as the fuse protection element.But adopt grid formula cartridge fuse-link as fuse-link heating temp height when the load peak, and insulating material ageing failure very easily under the alternating hot and cold effect, thereby its reliability and stability influenced.
Intelligent grid is an electric power system that is made of the transmission and disttrbution system of numerous automations, realizes all electrical network runnings with coordination, effective and reliable mode, has self-healing function; Respond electricity market and business event demand fast; Have intelligentized communication construction, realization is information flow in real time, safely and flexibly, for the user provides reliable, economic electrical power services.
Exactly because this special advantages, intelligent grid become the important component part of many national sustainable development strategies gradually, development rapidly.
The essential characteristic of the intelligent grid of China is to realize informationization, automation, interactive technically.
As one of indispensable visual plant of distribution network, the intelligentized updating transformation of low-voltage distribution transformer fuse box has important and practical meanings to the intellectuality of whole distribution network.Traditional mechanical type distribution transforming fuse box can not satisfy intelligent grid to the requirement of power distribution network informationization, automation, if not adding improvement just lets alone to remain running in the intelligent power distribution network, because it does not possess automation performances such as information monitoring, transfer of data or telemechanical operation, there is hidden danger in stability to intelligent grid, can the serious process that hinders the low voltage power transmission system intelligent.
For adapting to the requirement of domestic intelligent grid, the particularly development of intelligent grid equipment manufacture, press for a kind of features/functionality that can realize existing low-voltage distribution transformer fuse box, can satisfy the intelligent grid networking requirement again, low-voltage distribution transformer fuse box class device with automation performances such as information monitoring, transfer of data or telemechanical operations is to adapt to the Intelligent Developing Trends of whole country electrical network.
Summary of the invention
Technical problem to be solved by this invention provides a kind of electronic low pressure distribution transforming fuse box of simulating multiple fuse characteristics curve; it is by the anti-time limit characteristic of simulation all size fuse; " tripping operation " or " combined floodgate " operation of control killer switch; realize the side circuit defencive function of fuse; can avoid adopting grid formula cartridge fuse-link as fuse-link in load heating temp height and insulating material defective of ageing failure very easily under the alternating hot and cold effect during peak.
Technical scheme of the present invention is: a kind of electronic low pressure distribution transforming fuse box of simulating multiple fuse characteristics curve is provided, comprise the circuit overload protection module that is arranged in the casing, described circuit overload protection module comprises instrument transformer group, killer switch and control unit; Its described instrument transformer group is serially connected in the three-phase major loop, is used for measuring in real time the load current value of each phase of major loop, and measurement result is sent to described control unit; Its described killer switch cuts off or connects the three-phase circuit of major loop under the control of control unit; It is characterized in that:
Its described control unit is with the variation tendency of order of magnitude or each phase load electric current of each phase load current value of major loop, compare with the anti-time limit characteristic curve setting value of fuse, killer switch is carried out " tripping operation " or " combined floodgate " operation control, and line load electric current, circuit breaker switch state and low-voltage distribution transformer fuse box internal environment parameter externally exported with the form of digital signal, host computer is given in teletransmission, and accepts the telemechanical control of host computer.
The anti-time limit characteristic curve of its described control unit simulation fuse; " tripping operation " or " combined floodgate " operation of control killer switch; realize the side circuit defencive function of fuse, with avoid adopting grid formula cartridge fuse-link as fuse-link heating temp when the load peak the high and insulating material defective of ageing failure very easily under the alternating hot and cold effect.
Described control unit is decomposed into a plurality of points with the anti-time limit characteristic curve of fuse, handles by linear relationship between the each point, the corresponding tripping operation curve that constitutes killer switch, and according to the tripping operation action of the tripping operation curve controlled circuit breaker of this killer switch.
If the current value of described each phase load of major loop is constant overload current, then to delay time greater than theory during operate time when the actual overload of each phase load of major loop, control unit sends switch " tripping operation " signal.
When if the current value of described each phase load of major loop is the overload current that changes, when having served as live stream and having changed, convert accordingly by following formula the theoretical operate time of the time value that control unit will have been delayed time and different overload magnification correspondence, namely obtain relative time delay time time that overload current changes front and back, and send switch " tripping operation " signal accordingly:
Wherein: T is overload time; T
OFor overload changes preceding operate time; Tn is operate time after overload changes.
Its described specification with fuse of anti-time limit characteristic curve can be the rated current specification of various existing products.
Compared with the prior art, advantage of the present invention is:
1, by simulating the real physical characteristics curve of all size fuse, " tripping operation " or " combined floodgate " operation of control killer switch, realize the side circuit defencive function of fuse, can avoid adopting grid formula cartridge fuse-link as fuse-link in the load high and insulating material of heating temp defective of ageing failure very easily under the alternating hot and cold effect during peak, also can adapt to the needs of the circuit of various different power supply capacities easily;
2, but the circuit breaker repeated multiple times is jumped/closing operation, long service life, and maintenance workload is little, both has been conducive to environmental protection, can reduce line upkeep/replacing workload again;
3, adopt control unit that electric current or the ambient conditions signal of gathering carried out the logic analysis judgement, very big function expansibility is arranged, can be to line fault information record and remote transmission, and because use is the low power consuming components and parts, the caloric value of whole switch reduces greatly, meets life idea and the requirement of energy-conserving and environment-protective.
Description of drawings
Fig. 1 is electrical block diagram of the present invention.
Fig. 2 is circuit breaker inverse time lag tripping operation curve synoptic diagram.
1 is the circuit overload protection module among the figure, and 2 is control unit, and 3 is the current transformer group, and 4 is circuit breaker, and 5 is host computer, and B is transformer.
Embodiment
The present invention will be further described below in conjunction with accompanying drawing.
Among Fig. 1, technical scheme of the present invention provides a kind of electronic low pressure distribution transforming fuse box of simulating multiple fuse characteristics curve, comprise the circuit overload protection module 1 that is arranged in the casing, its described circuit overload protection module comprises instrument transformer group 3, killer switch 4 and control unit 2; Its described instrument transformer group is serially connected in the three-phase major loop, is used for the load current value of real-time measuring transformer 5 each phase of major loop, and measurement result is sent to described control unit; Its described killer switch is used for cutting off or connect the three-phase circuit of major loop under the control of control unit.
Its described control unit is with the variation tendency of order of magnitude or each phase load electric current of each phase load current value of major loop, compare with the anti-time limit characteristic curve setting value of fuse, killer switch is carried out " tripping operation " or " combined floodgate " operation control, and line load electric current, circuit breaker switch state and low-voltage distribution transformer fuse box internal environment parameter externally exported with the form of digital signal, host computer 5 is given in teletransmission, and accepts the telemechanical control of host computer.。
Concrete; the anti-time limit characteristic curve of described control unit simulation fuse; " tripping operation " or " combined floodgate " operation of control killer switch; realize the side circuit defencive function of fuse, with avoid adopting grid formula cartridge fuse-link as fuse-link heating temp when the load peak the high and insulating material defective of ageing failure very easily under the alternating hot and cold effect.
Its described control unit is decomposed into a plurality of points with the anti-time limit characteristic curve of fuse, handles by linear relationship between the each point, the corresponding tripping operation curve that constitutes killer switch, and according to the tripping operation action of the tripping operation curve controlled circuit breaker of this killer switch.
Concrete, if the current value of described each phase load of major loop is constant overload current, then to delay time greater than theory during operate time when the actual overload of each phase load of major loop, control unit sends switch " tripping operation " signal.
Perhaps, when if the current value of described each phase load of major loop is the overload current that changes, when having served as live stream and having changed, convert accordingly by following formula the theoretical operate time of the time value that control unit will have been delayed time and different overload magnification correspondence, namely obtain relative time delay time time that overload current changes front and back, and send switch " tripping operation " signal accordingly:
Wherein: T is overload time; T
OFor overload changes preceding operate time; Tn is operate time after overload changes.
To sum up; control unit is according to the anti-time limit characteristic curve of fuse and the size of load current in the technical program; consider the length of overload time; control the tripping operation action of circuit breaker according to the theoretical trip time (actual is the fusing time of the anti-time limit characteristic curve of fuse); simulate the actual working characteristics of fuse by this; and then reach corresponding protective feature; and because its signal has passed through digitlization; so can adopt various wired or wireless modes to carry out teletransmission to host computer, thereby realize digitlization and the intellectuality of low-voltage distribution transformer fuse box.
In addition, because the anti-time limit characteristic curve of different fuses is inequality, in existing real work, has only and adopt the way of the fuse of changing different size just can make it to be complementary with the line powering ability of needs; And in the technical program, as long as changing the right anti-time limit characteristic curve of fuse of different size can realize, expand the range of application of the technical program greatly, can greatly reduce purchase and supply amount and the warehouse storage of fuse product, reduced the integrated operation cost.
Concrete, the circuit breaker actual act Time Calculation method of the technical program is as follows:
At first that the corresponding electric current of fuse and fusing time list is as follows:
1) for constant overload current:
Actual overload time-delay is the switch separating brake during greater than theoretical operate time, for example: curve 0 in table, having served as live stream is 1.3In, theoretical opening time is 3400s, so under the 1.3In overload situations, the actual time delay time is 3400s, delay time error is ± 40ms;
2) for the overload current that changes:
When having served as live stream and changing, by formula 1 converted accordingly the theoretical operate time of the time value of having delayed time and different overload magnification correspondence, namely obtain the time relative time delay time of overload current before and after changing.For example: curve 0, serve as live stream and be 1.3In, theoretical opening time is 3400s, and overload current is 1.6In, and theoretical opening time is 400s, when having served as live stream for 1.3In, 100s has delayed time, when this moment, overload current increased to 1.6In from 1.3In, by formula obtaining the actual relative time delay time after 1 conversion was 12s, delays time on the 12s basis then.If overload current continues to change in the time-delay process, then calculate the actual relative time delay time by identical method, till the switch separating brake.
As seen, the technical program is compared with adopting actual fuse product, actual fuse product be to the predetermined current value with regard to fusing, and the technical program is to occur " time-delay " characteristic when can be implemented in 1.X times of predetermined current value, under the prerequisite that guarantees power supply safety, increase stability and the reliability of power supply.
Because the technical program is when constituting the tripping operation curve of killer switch, the anti-time limit characteristic curve of fuse is decomposed into a plurality of points, handle by linear relationship between the each point, come reduced data to calculate and processing procedure by this, reduce the amount of calculation of CPU in the control unit, improve its arithmetic speed and processing speed.
Fig. 2 has provided circuit breaker inverse time lag tripping operation curve synoptic diagram, because it is the standard drawing of this area, those skilled in the art can understand corresponding implication and characteristic fully, so its curve implication is no longer narrated at this.
The present invention is on the basis of original distribution transforming fuse box circuit function; anti-time limit characteristic by simulation different size fuse; adopt control unit and electronic component to substitute fuse element; both can be used as the short circuit of low voltage electric network and the protective device of overload, and can realize the input of low voltage electric network and cut off operation by operation its " branch ", " closing " again.Also can realize information gathering, the teleinstruction control of distribution line failure, realize the intelligentized updating of product, can satisfy the operation needs of intelligent grid.
The present invention can be widely used in the intellectuality control field of low pressure transformation and distribution system.
Claims (6)
1. the electronic low pressure distribution transforming fuse box that can simulate multiple fuse characteristics curve comprises the circuit overload protection module that is arranged in the casing, and described circuit overload protection module comprises instrument transformer group, killer switch and control unit; Its described instrument transformer group is serially connected in the three-phase major loop, is used for measuring in real time the load current value of each phase of major loop, and measurement result is sent to described control unit; Its described killer switch cuts off or connects the three-phase circuit of major loop under the control of control unit; It is characterized in that:
Its described control unit is with the variation tendency of order of magnitude or each phase load electric current of each phase load current value of major loop, compare with the anti-time limit characteristic curve setting value of fuse, killer switch is carried out " tripping operation " or " combined floodgate " operation control, and line load electric current, circuit breaker switch state and low-voltage distribution transformer fuse box internal environment parameter externally exported with the form of digital signal, host computer is given in teletransmission, and accepts the telemechanical control of host computer.
2. according to the described electronic low pressure distribution transforming fuse box of simulating multiple fuse characteristics curve of claim 1; the anti-time limit characteristic curve that it is characterized in that described control unit simulation fuse; " tripping operation " or " combined floodgate " operation of control killer switch; realize the side circuit defencive function of fuse, with avoid adopting grid formula cartridge fuse-link as fuse-link heating temp when the load peak the high and insulating material defective of ageing failure very easily under the alternating hot and cold effect.
3. according to the described electronic low pressure distribution transforming fuse box of simulating multiple fuse characteristics curve of claim 1, it is characterized in that described control unit is decomposed into a plurality of points with the anti-time limit characteristic curve of fuse, handle by linear relationship between the each point, the corresponding tripping operation curve that constitutes killer switch, and according to the tripping operation action of the tripping operation curve controlled circuit breaker of this killer switch.
4. according to the described electronic low pressure distribution transforming fuse box of simulating multiple fuse characteristics curve of claim 1, it is characterized in that if the current value of described each phase load of major loop is constant overload current, then delay time greater than theory during operate time when the actual overload of each phase load of major loop, control unit sends switch " tripping operation " signal.
5. according to the described electronic low pressure distribution transforming fuse box of simulating multiple fuse characteristics curve of claim 1, it is characterized in that if the current value of described each phase load of major loop during for the overload current that changes, when having served as live stream and having changed, convert accordingly by following formula the theoretical operate time of the time value that control unit will have been delayed time and different overload magnification correspondence, namely obtain relative time delay time time that overload current changes front and back, and send switch " tripping operation " signal accordingly:
Wherein: T is overload time; T
OFor overload changes preceding operate time; Tn is operate time after overload changes.
6. according to the described electronic low pressure distribution transforming fuse box of simulating multiple fuse characteristics curve of claim 1, it is characterized in that described specification with fuse of anti-time limit characteristic curve can be the rated current specification of various existing products.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2013101486417A CN103247998A (en) | 2013-04-25 | 2013-04-25 | Electronic type low-pressure distribution transformer fuse case capable of simulating various fuse characteristic curves |
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| CN2013101486417A CN103247998A (en) | 2013-04-25 | 2013-04-25 | Electronic type low-pressure distribution transformer fuse case capable of simulating various fuse characteristic curves |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109755925A (en) * | 2019-01-08 | 2019-05-14 | 李邦华 | The accurate state maintenance method of configurable circuit breaker based on existing failed storage data |
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| CN201601102U (en) * | 2009-10-23 | 2010-10-06 | 上海电力线路器材有限公司 | Electronic type low-voltage distribution transform fuse block |
| US20110019325A1 (en) * | 2008-03-24 | 2011-01-27 | Yazaki Corporation | Protection apparatus of load circuit |
| CN102007659A (en) * | 2008-04-15 | 2011-04-06 | 矢崎总业株式会社 | Load circuit protection device |
| CN201853666U (en) * | 2010-11-19 | 2011-06-01 | 南京鼎牌电器有限公司 | Residual current control and protection switch for distribution circuit |
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2013
- 2013-04-25 CN CN2013101486417A patent/CN103247998A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20110019325A1 (en) * | 2008-03-24 | 2011-01-27 | Yazaki Corporation | Protection apparatus of load circuit |
| CN201174571Y (en) * | 2008-03-31 | 2008-12-31 | 林龙杰 | Micro circuit breaker having micro-computer protection and liquid crystal display |
| CN102007659A (en) * | 2008-04-15 | 2011-04-06 | 矢崎总业株式会社 | Load circuit protection device |
| CN201601102U (en) * | 2009-10-23 | 2010-10-06 | 上海电力线路器材有限公司 | Electronic type low-voltage distribution transform fuse block |
| CN201853666U (en) * | 2010-11-19 | 2011-06-01 | 南京鼎牌电器有限公司 | Residual current control and protection switch for distribution circuit |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109755925A (en) * | 2019-01-08 | 2019-05-14 | 李邦华 | The accurate state maintenance method of configurable circuit breaker based on existing failed storage data |
| CN109755925B (en) * | 2019-01-08 | 2021-06-25 | 李邦华 | Configurable breaker accurate state overhauling method based on existing fault storage data |
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Application publication date: 20130814 |