CN103248001A - Electronic type low-pressure distribution transformer fuse case provided with inverse-time characteristic - Google Patents
Electronic type low-pressure distribution transformer fuse case provided with inverse-time characteristic Download PDFInfo
- Publication number
- CN103248001A CN103248001A CN2013101487956A CN201310148795A CN103248001A CN 103248001 A CN103248001 A CN 103248001A CN 2013101487956 A CN2013101487956 A CN 2013101487956A CN 201310148795 A CN201310148795 A CN 201310148795A CN 103248001 A CN103248001 A CN 103248001A
- Authority
- CN
- China
- Prior art keywords
- time
- control unit
- overload
- major loop
- fuse
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Landscapes
- Emergency Protection Circuit Devices (AREA)
Abstract
An electronic type low-pressure distribution transformer fuse case provided with an inverse-time characteristic belongs to the field of emergent protection devices, and comprises a circuit overload protection module arranged in a case body, wherein the circuit overload protection module comprises a mutual inductor group, circuit breaker switches and a control unit; the mutual inductor group is connected in series with a three-phase major loop, is used for measuring the load current values of various phases of the major loop in a real-time manner and sending the measured result to the control unit; the circuit breaker switches are used for switching on/off a three-phase circuit of the major loop under the control of the control unit; the control unit compares the absolute values of the load current values of the various phases of the major loop or the variation trend of the load current of the various phases with an inverse-time characteristic curve, performs the 'trip' operation control for the circuit breaker switches, and remotely transmits the circuit load current and the states of the circuit breaker switches to a host computer in a digital signal form. According to the invention, the fuse case realizes the intelligent upgrade of products, meets the operation 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 with anti-time limit characteristic; it is by the anti-time limit characteristic of circuit overload protection module simulation 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 with anti-time limit characteristic is provided, comprise the circuit overload protection module that is arranged in the casing, it is characterized in that: 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 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 set point, 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.
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.
Compared with the prior art, advantage of the present invention is:
1, simulates the real physical characteristics curve of fuse by the circuit overload protection module, " 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 heating temp when the load peak the high and insulating material defective of ageing failure very easily under the alternating hot and cold effect;
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 with anti-time limit characteristic, 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 set point, 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.
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 circuit overload protection module simulation 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 (5)
1. the electronic low pressure distribution transforming fuse box with anti-time limit characteristic comprises the circuit overload protection module that is arranged in the casing, it is characterized in that:
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 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 set point, 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 with anti-time limit characteristic 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 with anti-time limit characteristic 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 with anti-time limit characteristic 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 with anti-time limit characteristic 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.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013101487956A CN103248001A (en) | 2013-04-25 | 2013-04-25 | Electronic type low-pressure distribution transformer fuse case provided with inverse-time characteristic |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013101487956A CN103248001A (en) | 2013-04-25 | 2013-04-25 | Electronic type low-pressure distribution transformer fuse case provided with inverse-time characteristic |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103248001A true CN103248001A (en) | 2013-08-14 |
Family
ID=48927310
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2013101487956A Pending CN103248001A (en) | 2013-04-25 | 2013-04-25 | Electronic type low-pressure distribution transformer fuse case provided with inverse-time characteristic |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103248001A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112436476A (en) * | 2020-11-06 | 2021-03-02 | 江苏其厚智能电气设备有限公司 | Intelligent circuit breaker self-adaptive protection method |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4926288A (en) * | 1988-03-31 | 1990-05-15 | Wiltron Company | Over-current protection circuit |
| US20070253132A1 (en) * | 2006-04-27 | 2007-11-01 | Yazaki Corporation | Protection device for load circuits |
| CN101183129A (en) * | 2007-11-26 | 2008-05-21 | 天津理工大学 | Fault detection system of quench type superconductivity fault current-limiting device and detection method thereof |
| 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 |
| CN101978568A (en) * | 2008-03-24 | 2011-02-16 | 矢崎总业株式会社 | Protection apparatus of load circuit |
| CN101981775A (en) * | 2008-03-28 | 2011-02-23 | 矢崎总业株式会社 | 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 |
| CN102067401A (en) * | 2008-06-13 | 2011-05-18 | 矢崎总业株式会社 | Protection device for load circuit |
| 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 |
| CN102460881A (en) * | 2009-06-04 | 2012-05-16 | 矢崎总业株式会社 | Protection device for load circuits |
-
2013
- 2013-04-25 CN CN2013101487956A patent/CN103248001A/en active Pending
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4926288A (en) * | 1988-03-31 | 1990-05-15 | Wiltron Company | Over-current protection circuit |
| US20070253132A1 (en) * | 2006-04-27 | 2007-11-01 | Yazaki Corporation | Protection device for load circuits |
| CN101183129A (en) * | 2007-11-26 | 2008-05-21 | 天津理工大学 | Fault detection system of quench type superconductivity fault current-limiting device and detection method thereof |
| CN101978568A (en) * | 2008-03-24 | 2011-02-16 | 矢崎总业株式会社 | Protection apparatus of load circuit |
| CN101981775A (en) * | 2008-03-28 | 2011-02-23 | 矢崎总业株式会社 | 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 |
| CN102067401A (en) * | 2008-06-13 | 2011-05-18 | 矢崎总业株式会社 | Protection device for load circuit |
| CN102460881A (en) * | 2009-06-04 | 2012-05-16 | 矢崎总业株式会社 | Protection device for load circuits |
| 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 |
|---|---|---|---|---|
| CN112436476A (en) * | 2020-11-06 | 2021-03-02 | 江苏其厚智能电气设备有限公司 | Intelligent circuit breaker self-adaptive protection method |
| CN112436476B (en) * | 2020-11-06 | 2022-07-01 | 江苏其厚智能电气设备有限公司 | Intelligent circuit breaker self-adaptive protection method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103151839B (en) | Intelligent substation test research system | |
| CN104635153A (en) | Low-voltage circuit breaker feature test analysis platform | |
| CN102497021A (en) | Real-time monitoring and analysis system for distribution circuit | |
| CN104269090B (en) | The analogue system of a kind of power information acquisition terminal wheel secondary control switch and method thereof | |
| CN109827679B (en) | Distribution transformer winding temperature rise online monitoring system and online monitoring method | |
| CN103529708A (en) | Pre-operation simulation system for power distribution network and simulation analysis method | |
| CN201570909U (en) | Building special-purpose bus intelligence control system | |
| CN202737580U (en) | Intelligent power distribution switch equipment | |
| CN104569678A (en) | Transformer substation relay protection testing system | |
| CN205898921U (en) | Box -type substation current -carrying failure predication system | |
| CN205263300U (en) | Single -phase intelligent ammeter of multi -epitope stability on -line monitoring device under low temperature environment | |
| CN201256360Y (en) | Intelligent multifunctional low voltage frequency changing power device | |
| CN203398043U (en) | Low-voltage breaker with connecting terminal block temperature rise monitoring device | |
| CN105207239A (en) | Intelligent three phase load unbalance adjusting device and three phase load adjusting method | |
| CN103248001A (en) | Electronic type low-pressure distribution transformer fuse case provided with inverse-time characteristic | |
| CN103247998A (en) | Electronic type low-pressure distribution transformer fuse case capable of simulating various fuse characteristic curves | |
| CN203312779U (en) | Multilevel-area-latching release | |
| CN103580007A (en) | Intelligent frame controller | |
| CN104852352A (en) | Substation transformer overload protection system based on time varying power window and method thereof | |
| CN103247999B (en) | A kind of emulation mode that adopts is to realize the electrical fuse device of fuse real physical characteristics | |
| CN204376385U (en) | For carrying out the power transmission protective device of power transmission protection to step-up transformer | |
| CN204314684U (en) | A kind of temperature of high-tension switch cabinet supervisory system based on PLC | |
| CN204422718U (en) | A kind of substation relay protection test macro | |
| CN208094280U (en) | Miniature self-service sewage treatment control system on duty | |
| CN110910618A (en) | Data acquisition module of electrical system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20130814 |