CN108429248A - A kind of new-type no-load voltage ratio adjustable line breaker - Google Patents
A kind of new-type no-load voltage ratio adjustable line breaker Download PDFInfo
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- CN108429248A CN108429248A CN201810491565.2A CN201810491565A CN108429248A CN 108429248 A CN108429248 A CN 108429248A CN 201810491565 A CN201810491565 A CN 201810491565A CN 108429248 A CN108429248 A CN 108429248A
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- Prior art keywords
- load voltage
- voltage ratio
- control
- current
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
Abstract
The invention discloses a kind of new-type no-load voltage ratio adjustable line breakers, including demarcation circuit breaker ontology and control terminal, demarcation circuit breaker ontology is electrically connected with control terminal by cable, the external voltage transformer of demarcation circuit breaker ontology, the adjustable current transformer of built-in no-load voltage ratio, manual divide-shut brake switch, electronic on-off switch and energy storage motor, control terminal includes control panel and control host, and control terminal is attached with voltage transformer, current transformer by cable；Electric current after the plant modification is selected in 1 200A, and the reduction frequency of power cut which can not only be larger reduces the labor intensity of worker at the production line, and social benefit is also considerable.
Description
Technical field
The present invention relates to technical field of relay protection, more particularly, to a kind of new-type no-load voltage ratio adjustable line breaker.
Background technology
It is higher and higher to the reliability requirement of safe power supply with the rapid development of power grid, for thin in operation of power networks
Weak link power department takes effectively control measures, reduces forced outage by every possible means, reduces scope of power outage.And 10 kilovolts are matched
Electric line, due to outdoor erection, safe operation is directly influenced by ambient enviroment and weather conditions, and there are accident rate height, things
Therefore search difficult, security reliability difference problem.The longer outlying mountain area user of some overhead transmission lines is even more often subject to severe
The influence of weather is unable to normal electricity consumption.In addition, after the current transformer of old-fashioned distributor breaker is selected, the no-load voltage ratio of current transformer
If necessary to change, it is necessary to which power failure could change, and the current transformer of 200A, and minimum is only capable of selecting 100/5 change road.
The document of 106451787 A of Publication No. CN discloses a kind of intelligent demarcation breaker control system and is adopted by signal
Collection and conditioning module, demarcation circuit breaker control circuit, wireless radio-frequency communication module, telecommunication and control module and drive control
Output with execution module form, demarcation circuit breaker control circuit respectively with signal acquisition and conditioning module, twireless radio-frequency communication mould
Block, telecommunication and control module and drive control output are connect with execution module as electric signal, although the document improves line
Loading capability is passed by, is conducive to the safely and steadly operation of power grid, but it is not that no-load voltage ratio can that the document, which cannot achieve on current transformer,
It adjusts, electric current cannot achieve intelligent no-load voltage ratio and the intelligent demarcation breaker control system can not be real by the form of SMS
Existing intelligent alarm, needs to be further increased.
The document of 101741060 A of publication number CN discloses a kind of demarcation circuit breaker device, it includes high pressure vacuum boundary
Breaker body, intelligent protection terminal, a zero sequence current mutual inductor and two electricity built in high pressure vacuum demarcation circuit breaker ontology
The mains side of current transformer, high pressure vacuum demarcation circuit breaker ontology fills voltage transformer, the intelligence being located on live distribution line
Protection terminal is divided into the protective device and GPRS communication modules that distribution line operating status is protected, measured to distribution line
Two parts, protective device pass through hermetically sealed water proof type aviation connector and outdoor hermetically-sealed cable and high pressure vacuum demarcation circuit breaker sheet
Body is directly connected to, is connect with GPRS communication modules by serial line interface, intelligent protection terminal and high pressure vacuum demarcation circuit breaker sheet
The operation power and voltage signal of body are provided by voltage transformer, but cannot achieve intelligent change on the current transformer of the device
Than adjustable, current ratio is a fixed value, cannot achieve the intelligent no-load voltage ratio of electric current, to be improved in terms of current intelligent no-load voltage ratio.
Invention content
In view of this, in view of the deficiencies of the prior art, it is an object of the present invention to provide a kind of new-type no-load voltage ratio adjustable lines to break
Road device by using variable C T and installs electronic tripping coil additional, using communication-type intelligent control technology, has automatic excision single
To earth fault, isolation phase fault, disconnect excessive current loads, under-voltage over-voltage protecting function.
In order to achieve the above objectives, the present invention uses following technical scheme：
A kind of new-type no-load voltage ratio adjustable line breaker, including demarcation circuit breaker ontology and control terminal, the demarcation circuit breaker sheet
Body is electrically connected with the control terminal by cable, the external voltage transformer of demarcation circuit breaker ontology, built-in change
It connect than adjustable current transformer, manual divide-shut brake switch, electronic on-off switch and with the electronic on-off switch
Energy storage motor, the control terminal include control panel and control host, and the control panel is equipped with liquid crystal display, operation
Button, indicator light, RS232 interface, RS485 interfaces and SIM card mouth, the control host is interior to be equipped with signal processing unit, acquisition
Unit, control unit, communication unit, storage unit and trouble and managing processing unit, the control terminal and the mutual induction of voltage
Device, the current transformer are attached by cable；
Described control unit be DSP digital signal processors, the signal processing unit be by the voltage transformer,
The current or voltage for exchanging change of variable isolation circuit is isolated in the current transformer, and converts a signal into filter and amplification
The output signal of circuit and frequency measurement circuit, the collecting unit are realized by 10 road DI, 7 road DO circuits to the demarcation circuit breaker
The breaker tripping and closing of ontology are acquired and monitor that the communication unit passes through the RS232 and the RS485 interfaces and the boundary
Breaker body realizes that communication, the storage unit are stored in internal FLASH memory, and the FLASH memory passes through
Bus is connect with the DSP digital signals processor, and the trouble and managing processing unit is accessed by power monitorings at different levels
Failure in device and alarm.
Further, the electric current of the current transformer of the no-load voltage ratio includes A, B, C three-phase current and zero-sequence current, the electricity
Ranging from 1-200A after the no-load voltage ratio of current transformer.
Further, the switching manipulation of the manual divide-shut brake switch, electronic on-off switch is by energy storage electricity
Machine controls closing coil, switching winding is realized.
Further, boundary circle breaker body is equipped with input circuit and output loop.
Further, the output loop includes the output of control combined floodgate, control tripping output and alarm output.
Further, the liquid crystal display can carry out protection setting, the setting of voltage and current no-load voltage ratio, clock setting, password
Record setting, branch wire time setting are removed in modification setting.
Further, the protection setting includes fast tripping protection, quick-break delay, specified time overcurrent, inverse-time overcurrent, zero sequence
Protection, overvoltage protection and under-voltage protection.
The present invention provides a kind of new-type no-load voltage ratio adjustable line breaker, by using variable C T and installs electronic breaker tripping and closing line additional
Circle, advantage are：
1, unidirectionally ground connection, phase fault can quickly be cut off in boundary；
2, line load in boundary is monitored in real time；
3, three sect current protection has the function of zero-sequence current, voltage measurement, can distinguish in boundary, out-of-bounds failure；
4, have the function of reclosing, locally, remotely remote control divide-shut brake three times；
5, overvoltage, under-voltage protection function；
6, automatic closing, power-off automatic brake separating function are powered on；
7, there is failure SMS alarm and short message switching on and off control function（Remote communication module need to be matched）；
8, there is three-phase voltage measurement, three-phase current to measure, power（Two elements）Measure function.
The current transformer of improved 200A, its electric current are selected in 1-200A, the convenient outlet with substation
Switch cooperation, and protection definite value can be set, the real time data of each section of circuit is grasped whenever and wherever possible；Flexibly, as long as mobile phone has
Signal can adjust distributor breaker no-load voltage ratio at any time according to load variations situation, reduce tripping times.The device can not only be compared with
Big reduction frequency of power cut, reduces the labor intensity of worker at the production line, and social benefit is also considerable.If the circuit is per small
Shi Pingjun power supply 6000KWH, monthly tripping is 6 times average, 30 minutes every time, that is, monthly only this circuit supplies 18000 degree less
Electricity, meanwhile, primary power failure is often reduced, just reduces by power customer double faults caused by power failure and reports for repairment, and have a power failure and draw
It sends out complaint event a series of, certain positive social benefit is brought to power administration.
Description of the drawings
Fig. 1：A kind of device connection relationship diagram of new-type no-load voltage ratio adjustable line breaker；
Fig. 2：A kind of schematic diagram of the control panel of new-type no-load voltage ratio adjustable line breaker control terminal；
Fig. 3：A kind of new-type no-load voltage ratio adjustable line breaker control end host internal structure schematic diagram；
Fig. 4：A kind of wiring diagram of new-type no-load voltage ratio adjustable line breaker control terminal boundary switch controller.
Specific implementation mode
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
Attached drawing, the technical solution of the embodiment of the present invention is clearly and completely described.Obviously, described embodiment is this hair
Bright a part of the embodiment, instead of all the embodiments.Based on described the embodiment of the present invention, ordinary skill
The every other embodiment that personnel are obtained, shall fall within the protection scope of the present invention.
Embodiment 1
As shown in Figure 1, a kind of new-type no-load voltage ratio adjustable line breaker, including demarcation circuit breaker ontology and control terminal, described point
Boundary's breaker body is electrically connected with the control terminal by cable, the external mutual induction of voltage of demarcation circuit breaker ontology
Device, the adjustable current transformer of built-in no-load voltage ratio, manual divide-shut brake switch, electronic on-off switch and is opened with the electronic divide-shut brake
The energy storage motor connect is correlated, wherein：Voltage transformer provides required electric energy, current transformer for the demarcation circuit breaker ontology
It is adjusted by no-load voltage ratio, energy storage motor controls the closed action of electronic on-off switch, and the control terminal includes control plane
Plate and control host, as shown in Fig. 2, the control panel is equipped with liquid crystal display 1, operation button 2, indicator light 3, RS232
Interface/RS485 interfaces 4 and SIM card mouth 5, the operation button include upwarding key, down Arrow, left key, right key, determination key,
Separating brake key, combined floodgate key return to button, and the indicator light includes run indicator, locking indicator light, energy storage indicator light, closing position
Indicator light, over current fault indicator light, quick-break malfunction indicator lamp, zero-sequence fault indicator light and sub-gate position indicator light, SIM card mouth are pre-
Mouth is stayed, when installing GSM message function additional, the report of fault trip can be sent to mobile phone after control terminal detects failure and trips
Alert short message.It can flexible mating GPRS/CDMA, power line carrier, optical-fibre communications mode pair by RS232 interface and RS485 interfaces
The demarcation circuit breaker ontology is communicatively coupled, and realizes that fault message reports the real-time report with line facility information automatically,
Signal processing unit, collecting unit, control unit, communication unit, storage unit and trouble and managing are equipped in the control host
Processing unit, the control terminal are attached with the voltage transformer, the current transformer by cable；
As shown in figure 3, the intelligent control unit is DSP digital signal processor, using 32 highly integrated performance figures signals
Processor, the signal processing unit are by the voltage transformer, the current transformer to exchange change of variable isolation electricity
The current or voltage on road is isolated, and using the external alternating current in 11 tunnel of mutual inductor pair, and converts a signal into filter and amplification electricity
The output signal of road and frequency measurement circuit, shares the second-order low-pass filter and amplifying circuit of 14 paths, and the collecting unit passes through
10 road DI, 7 road DO circuits realizations are acquired and monitor to the breaker tripping and closing of the demarcation circuit breaker ontology, and the communication unit is logical
It crosses the RS232 and the RS485 interfaces and realizes that communication, the storage unit are stored in inside with the demarcation circuit breaker ontology
FLASH memory in, the FLASH memory is connect by bus with the DSP digital signals processor, it is described therefore
Barrier memory processing unit passes through the failure in power monitoring access devices at different levels and alarm.SPI ferroelectric RAMs are deposited for serial non-volatile
Reservoir, data will not be changed or be lost under power-down conditions, and read-write number is unlimited, and serial communication has the anti-interference energy of higher
Power can store significant data, protection definite value, device parameter.Power monitorings at different levels include accessory power supply, the dress accessed to device
The observation circuit of internal simulation and digital circuit is set, device judges power supply situation, and it is device to take Corresponding Countermeasures, clock circuit
Internal calendar time is provided.In the case of power down, by device internal battery powers, maintain to run well, the survey of body temperature
Whether amount seriously generates heat for judgment means, can be alerted more than 80 DEG C.
As shown in figure 4, the electric current of the current transformer of the no-load voltage ratio includes A, B, C three-phase current and zero-sequence current, it is described
Ranging from 1-200A after the no-load voltage ratio of current transformer.It is connect with current transformer by demarcation circuit breaker, makes separation road device
Current adjustment, three sect current protection, have zero-sequence current, the current transformer of old-fashioned distributor breaker it is selected after, electric current is mutual
The no-load voltage ratio of sensor is if necessary to change, it is necessary to which power failure could change, and the current transformer of 200A, minimum are only capable of selection 100/
5 no-load voltage ratio, after transformation, the current transformer of 200A, its electric current is selected in 1-200A.
The switching manipulation of the manual divide-shut brake switch, electronic on-off switch is to control to close a floodgate by the energy storage motor
Coil, switching winding are realized.The closed state that electronic on-off switch is controlled by energy storage motor, is controlled by energy storage motor
" closing " and " conjunction " of the electronic on-off switch of flexible drive of spring coil.It can be opened by manual divide-shut brake in concrete operations
Pass, electronic on-off switch automatically select the closed procedure pattern of demarcation circuit breaker ontology, easy to use.
Boundary circle breaker body is equipped with input circuit and output loop.Input circuit includes that 6 way switch amounts are defeated
Enter, AC/DC220V, DC24V or idle contact, the output loop includes the output of control combined floodgate, control tripping output and alerts defeated
Go out.Control, which is closed a floodgate, to be exported：1 tunnel is normally opened, pulsewidth 1S, can connect and exchange 250V/5A with cut-offfing, control tripping output：1 tunnel is normal
It opens, pulsewidth 1S, can connect and exchange 250V/5A with cut-offfing, alarm output：1 tunnel is normally opened, can connect and exchange 250V/ with cut-offfing
5A。
The liquid crystal display can carry out protection setting, the setting of voltage and current no-load voltage ratio, clock setting, password modification setting,
Remove record setting, branch wire time setting.Wherein：As shown in table 1, the protection setting include fast tripping protection, quick-break delay,
Definite time-lag overcurrent, inverse-time overcurrent, zero-sequenceprotection, overvoltage protection and under-voltage protection.
Table 1：The content of protection setting
The setting of voltage and current no-load voltage ratio includes measuring CT no-load voltage ratios, protection CT no-load voltage ratios, zero sequence CT no-load voltage ratios, protection, PT no-load voltage ratios,
The value of zero sequence PT no-load voltage ratios, all no-load voltage ratios must be arranged according to actual value, and otherwise a real time data can be shown not in controller
Correctly, clock setting can change current date and time of control terminal and be configured, and password modification setting enters setting mould
The password that formula needs, acquiescence 000000, all logouts stored in controller, thing can be removed herein by removing record
It is irrecoverable after part record purge, please use with caution；It needs to input administrator password, acquiescence 654321, divide-shut brake when removing record
It must restart controller after time setting modification parameter, otherwise may not come into force, please don't change in this unless necessary
Any content, be otherwise likely to result in controller operation irregularity.
Finally illustrate, the above examples are only used to illustrate the technical scheme of the present invention and are not limiting, this field is common
Other modifications or equivalent replacement that technical staff makes technical scheme of the present invention, without departing from technical solution of the present invention
Spirit and scope, be intended to be within the scope of the claims of the invention.
Claims (7)
1. a kind of new-type no-load voltage ratio adjustable line breaker, including demarcation circuit breaker ontology and control terminal, it is characterised in that：It is described
Demarcation circuit breaker ontology is electrically connected with the control terminal by cable, and the external voltage of demarcation circuit breaker ontology is mutual
Sensor, the adjustable current transformer of built-in no-load voltage ratio, manual divide-shut brake switch, electronic on-off switch and with the electronic divide-shut brake
The energy storage motor of connection is switched, the control terminal includes control panel and control host, and the control panel is equipped with liquid crystal
Display, operation button, indicator light, RS232 interface, RS485 interfaces and SIM card mouth, the control host is interior to be equipped at signal
Manage unit, collecting unit, control unit, communication unit, storage unit and trouble and managing processing unit, the control terminal and institute
State voltage transformer, the current transformer is attached by cable；
Described control unit be DSP digital signal processors, the signal processing unit be by the voltage transformer,
The current or voltage for exchanging change of variable isolation circuit is isolated in the current transformer, and converts a signal into filter and amplification
The output signal of circuit and frequency measurement circuit, the collecting unit are realized by 10 road DI, 7 road DO circuits to the demarcation circuit breaker
The breaker tripping and closing of ontology are acquired and monitor that the communication unit passes through the RS232 and the RS485 interfaces and the boundary
Breaker body realizes that communication, the storage unit are stored in internal FLASH memory, and the FLASH memory passes through
Bus is connect with the DSP digital signals processor, and the trouble and managing processing unit is accessed by power monitorings at different levels
Failure in device and alarm.
2. a kind of new-type no-load voltage ratio adjustable line breaker according to claim 1, it is characterised in that：The electric current of the no-load voltage ratio
The electric current of mutual inductor includes A, B, C three-phase current and zero-sequence current, the ranging from 1-200A after the no-load voltage ratio of the current transformer.
3. a kind of new-type no-load voltage ratio adjustable line breaker according to claim 1, it is characterised in that：The manual divide-shut brake
The switching manipulation of switch, electronic on-off switch is realized by energy storage motor control closing coil, switching winding.
4. a kind of new-type no-load voltage ratio adjustable line breaker according to claim 1, it is characterised in that：The boundary circle is disconnected
Road device ontology is equipped with input circuit and output loop.
5. a kind of new-type no-load voltage ratio adjustable line breaker according to claim 4, it is characterised in that：The output loop packet
Include the output of control combined floodgate, control tripping output and alarm output.
6. a kind of new-type no-load voltage ratio adjustable line breaker according to claim 1, it is characterised in that：The liquid crystal display
It can carry out protection setting, the setting of voltage and current no-load voltage ratio, clock setting, password modification setting, remove record setting, branch wire time
Setting.
7. a kind of new-type no-load voltage ratio adjustable line breaker according to claim 6, it is characterised in that：The protection setting packet
Include fast tripping protection, quick-break delay, specified time overcurrent, inverse-time overcurrent, zero-sequenceprotection, overvoltage protection and under-voltage protection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810491565.2A CN108429248A (en) | 2018-05-22 | 2018-05-22 | A kind of new-type no-load voltage ratio adjustable line breaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810491565.2A CN108429248A (en) | 2018-05-22 | 2018-05-22 | A kind of new-type no-load voltage ratio adjustable line breaker |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108429248A true CN108429248A (en) | 2018-08-21 |
Family
ID=63163801
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810491565.2A Pending CN108429248A (en) | 2018-05-22 | 2018-05-22 | A kind of new-type no-load voltage ratio adjustable line breaker |
Country Status (1)
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| CN (1) | CN108429248A (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009027824A (en) * | 2007-07-19 | 2009-02-05 | Chugoku Electric Power Co Inc:The | Ratio differential relay and method of preventing erroneous operation of ratio differential relay |
| CN101741060A (en) * | 2010-01-03 | 2010-06-16 | 郑文秀 | Demarcation circuit breaker device and remote monitoring method thereof |
| CN202309231U (en) * | 2011-11-05 | 2012-07-04 | 童淮安 | Automatic distribution remote control terminal ftu |
| CN203135424U (en) * | 2013-03-20 | 2013-08-14 | 廊坊市方威电力设备制造有限公司 | Demarcation load switch enabling transformation ratio switches |
| WO2015103883A1 (en) * | 2014-01-13 | 2015-07-16 | 江苏现代电力科技股份有限公司 | Integrated high-voltage alternating-current circuit breaker controller |
| CN204966375U (en) * | 2015-08-14 | 2016-01-13 | 江苏润圣电气有限公司 | Vacuum circuit breaker on intelligence post |
| CN105762008A (en) * | 2016-04-19 | 2016-07-13 | 珠海航天科创实业有限公司 | CT-ratio-adjustable vacuum switch |
| CN205666177U (en) * | 2016-05-13 | 2016-10-26 | 浙江宏伟电网科技股份有限公司 | Outdoor interchange high pressure boundary circuit breaker |
-
2018
- 2018-05-22 CN CN201810491565.2A patent/CN108429248A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009027824A (en) * | 2007-07-19 | 2009-02-05 | Chugoku Electric Power Co Inc:The | Ratio differential relay and method of preventing erroneous operation of ratio differential relay |
| CN101741060A (en) * | 2010-01-03 | 2010-06-16 | 郑文秀 | Demarcation circuit breaker device and remote monitoring method thereof |
| CN202309231U (en) * | 2011-11-05 | 2012-07-04 | 童淮安 | Automatic distribution remote control terminal ftu |
| CN203135424U (en) * | 2013-03-20 | 2013-08-14 | 廊坊市方威电力设备制造有限公司 | Demarcation load switch enabling transformation ratio switches |
| WO2015103883A1 (en) * | 2014-01-13 | 2015-07-16 | 江苏现代电力科技股份有限公司 | Integrated high-voltage alternating-current circuit breaker controller |
| CN204966375U (en) * | 2015-08-14 | 2016-01-13 | 江苏润圣电气有限公司 | Vacuum circuit breaker on intelligence post |
| CN105762008A (en) * | 2016-04-19 | 2016-07-13 | 珠海航天科创实业有限公司 | CT-ratio-adjustable vacuum switch |
| CN205666177U (en) * | 2016-05-13 | 2016-10-26 | 浙江宏伟电网科技股份有限公司 | Outdoor interchange high pressure boundary circuit breaker |
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