CN203071571U - Intelligent monitoring device for distributed boundary switches - Google Patents
Intelligent monitoring device for distributed boundary switches Download PDFInfo
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- CN203071571U CN203071571U CN2013200141335U CN201320014133U CN203071571U CN 203071571 U CN203071571 U CN 203071571U CN 2013200141335 U CN2013200141335 U CN 2013200141335U CN 201320014133 U CN201320014133 U CN 201320014133U CN 203071571 U CN203071571 U CN 203071571U
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- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S40/00—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them
- Y04S40/12—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment
- Y04S40/126—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment using wireless data transmission
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Abstract
The utility model discloses an intelligent monitoring device for distributed boundary switches. The intelligent monitoring device for the distributed boundary switches comprises the boundary switches, wherein the boundary switches are connected with the boundary switch monitoring device, the boundary switches, an incoming wire switch and a ring network outgoing wire switch are connected with a transformer through outgoing wire and a bus, and the boundary switch monitoring device is connected with a monitoring server through a wireless network. The boundary switch monitoring device is used for realizing remote control of a closing/opening switch; when an inter-phase short circuit fault occurs in a user boundary, after opening of a feed line breaker in a transformer station and power failure of power line, electromagnetic tripping is started to disconnect a boundary load switch; when a single-phase grounding fault occurs in the user boundary, electromagnetic tripping is directly started to disconnect the boundary load switch. The intelligent monitoring device for the distributed boundary switch is advantaged in that national power distribution automation capability is improved; and power supply reliability of a power distribution network is improved.
Description
Technical field
The utility model relates to supervising device, mainly is a kind of distributed demarcation switch intelligence monitoring and controlling device.
Background technology
Along with electrical network develops rapidly, more and more higher to the reliability requirement of safe power supply, take effective control measures at the weak link electrical production department in the operation of power networks, reduce accident interruption by every possible means, dwindle the power failure scope.But distribution line long transmission distance, branch line are many, the natural environment and climate inclement condition, and natural calamities such as outer broken, equipment fault and thunder and lightning usually cause failure rate higher.In the 10kV of China power distribution network, a large amount of faults is single phase ground fault, and wherein the fault point of significant proportion appears at load side.The power failure in case break down is at first made troubles to people's life, has disturbed the ordinary production operation of enterprise; Secondly cause greater loss to electric company; Moreover the distribution line distance is more and more longer, and branch is many again, is network structure, searches fault, and is very difficult, wasted great amount of manpower, material resources.
China 10kV distribution system generally adopts neutral point of electric network earth-free or through the small current neutral grounding mode of grounding through arc, when system's generation single-phase earthing, the line distribution capacitance electric current of earth fault current reflection is often very little, the symmetry of system line voltage is destroyed, electrical network still is allowed to continue operation a period of time, and the rules regulation is generally 1～2h; For preventing that systematic failures from enlarging, the ground connection operation during this period of time in must distinguish and get rid of earth fault as early as possible.Therefore, since the eighties in 20th century, various types of Small Electric Current Earthing And Routing Devices occur, experienced repeatedly technology innovation, though in corresponding raising, also there are following all drawbacks in the accuracy of route selection in actual applications:
1) because present Small Electric Current Earthing And Routing Device all adopts the mode of installing concentratedly, in the time of system loading end generation single phase ground fault, line selection apparatus can only navigate to distribution line, and can not navigate to concrete fault point, more can not give the maintainer fault message timely.
2) existing little electric current line selection apparatus is by jumping out wiretap excision faulty line, must have influence on all users on this circuit, can enlarging the power failure scope.
3) earth current of small current neutral grounding system itself is very little, and in the installing place of the Small Electric Current Earthing And Routing Device in transformer station and power plant, electromagnetic interference is big, and this causes the certainty of measurement of a lot of Small Electric Current Earthing And Routing Devices influenced easily, line occurs falsely dropping.
4) the power distribution network operational mode of China's small current neutral grounding system changes frequently, and length and the quantity of transformer station's outlet frequently change, and its capacitance current also frequently changes.When the operational factor of system changed, malfunction or tripping appearred in a lot of Small Electric Current Earthing And Routing Devices easily because the remaining of definite value is less.
China power distribution network circuit T access node structure, (fault is in its inlet wire section when the inner generation of user's branched line single phase ground fault, though or fault occurs in subscriber's drop switch inboard), isolation earth fault that if can be is promptly and accurately also accurately located the fault point, can reduce the power failure area greatly, effectively strengthen power supply reliability, improve maintenance efficiency.
Search efficiency during for raising fault point especially user side fault, usually adopt following two class modes at present in the power distribution network: a class utilizes protective relaying device, distribution supervisory control system and other special arrangement that information specific is provided; Another kind ofly do not need special device, and only utilize the information of the phone call for appeal that the user makes.It is more accurate that first kind method is judged, but usually will adopt wired passage such as optical fiber to communicate, and all has variety of issue at aspects such as cost, wiring, networking, maintenances, causes big and need a large amount of hardware modification costs to drop in communication network development investment.Second class methods substantially need not be new investment, but when the information of utilizing the fault phone is carried out fault location, because the user does not understand the power distribution network specifying information, so need complaint call from customers is carried out examination, and the examination mode only is suitable for a specific distribution network, and adaptability is bad, ought run into sudden simultaneously, when accident caused communication failure on a large scale, this method was with inoperative.
At present present situation, domestic also have many producers or research institution to propose the concept of power distribution network " house dog " and develop some Related products.But there are following drawbacks, influenced actual result of use.
The product of the producer that 1) has adopts analog design, and zero sequence ground connection is adopted fixing definite value, can not adjust with different system situation, when system operation mode changes, the situation of tripping or misoperation can occur.
2) some product lacks communication mode, perhaps adopts wired serial interface communication mode, can not will give the maintainer on the fault message timely and effectively, greatly reduces the efficient of repair and maintenance.
3) present product all is based on independent on-load switch controller function design, lacks the system applies function, can not realize that system-wide real-time state monitoring, topological diagram show and senior application such as accident analysis.
Therefore, research one cover principle Fault Isolation navigation system reliable, easy to use, perfect in shape and function is significant to reliability service, raising overhaul efficiency, the enhancing intelligent level of safeguarding power distribution network.
Electric power system exists huge, setting disperses, equipment is many, be worth high, wherein quite a few equipment is operated in outdoor characteristics, therefore, need accomplish real-time monitoring to the running status of various device, parameter index etc., in case the situation that occurs can in time be reported to the police and can carry out command scheduling and adjustment long-range; And the general industry control system is cross-regional bigger, and monitoring point quantity is many, requires communication system speed to want high, and the poll response time wants fast; Simultaneously, some settings are scattered in the field, and environment is abominable, need the unattended duty Long-distance Control.In the past, the communication mode of power distribution network mainly is to take cable network.It is reliable that cable network exists data, safety, advantage such as the error rate is low.But along with the increase of system scale, the problem of cable network becomes increasingly conspicuous, and it is unfavorable for expansion and the change of system, also is inconvenient to carry out long-range control.So wireless network becomes the indispensable part of this class industry future development now.The present domestic way that mainly contains following several solution remote monitoring:
1) adopts satellite communication;
2) adopt different high-power wireless data radio stations;
3) adopt dialing;
4) transmit by mobile public network (GSM/GPRS/CDMA).
Wherein, first three kind is traditional transfer of data settling mode, there are a lot of problems in these traditional approachs at aspects such as coverage, real-time, investment and operating costs, are not easy to realize the unattended duty of watch-dog simultaneously, and the discovery in time etc. that differs surely going wrong.At present, emerging data transmission technologies such as GPRS, CDMA have the unexistent advantage of a lot of conventional data transmission modes, can solve the drawback of conventional transmission mode, press close to the expert data transmission requirements more.Comparatively speaking, along with technological transformation and development, GPRS at present oneself through tending towards stability, reliably wide coverage; CDMA then has characteristics such as speed height, system stability, but coverage is less at present, and expert data transport service on a large scale still can't be provided.Both compare, and GPRS is as expert data transmission system network support platform, ensure that in conjunction with data encryption technology the network transmission safety realizes that the expert data transmission system is preferable selection.Adopt advanced GPRS wireless communication technology, can realize the Real-time Monitor Management of wireless distribution system and deployment flexibly, solve tradition control owing to there is not communication function, can't realize the problem of centralized monitor, thereby can save a large amount of manpower and materials, and can improve the running quality of wireless system, strengthen reliability and the controllability of radio communication, can in time find to locate the wireless system fault, improve power supply reliability greatly.
GPRS is packet data bearers and the transport service that grows up on the gsm system basis.GSM can only use the note form to transmit data, can't accomplish " real-time online ", " chargeing according to quantity ".With GSM relatively, GPRS is in the carrying of data service and support to have very remarkable advantages, more efficient use radio network information channel resource, be specially adapted to intermittently, aperiodic transfer of data, a spot of transfer of data, the larger capacity data are frequent transmission etc. not.But for realizing the high reliability of transfer of data, the main website of Surveillance center need directly insert the GPRS mobile base station by private-line mode, and obtains a fixed IP addresses.Adopt this mode to form point-to-point configuration and have good, the safe characteristics of real-time, but access fee is higher relatively.
Carry out the wireless communication data transmission by the GSM/GPRS of mobile public network, technology maturation reliable and invest little, be subjected to the influence of environment and occasion little, be an implementation that application prospect is relatively arranged.
Summary of the invention
The purpose of this utility model is to overcome the deficiency that prior art exists, and a kind of distributed demarcation switch intelligence monitoring and controlling device is provided.
The purpose of this utility model is finished by following technical solution.This distributed demarcation switch intelligence monitoring and controlling device comprises demarcation switch, and described demarcation switch is connected with the demarcation switch measure and control device, and demarcation switch, service entrance switch and looped network go out wiretap and be connected with transformer by outlet, bus; The demarcation switch measure and control device is connected with monitoring server by wireless network; The demarcation switch measure and control device is used for remote control on/off switch switch, after in the user circle phase fault taking place, at transformer station's feeder line breaker open operation, after the circuit dead electricity, starts electromagnetic trip tripping demarcation load switch; After in the user circle single phase ground fault taking place, directly start electromagnetic trip tripping demarcation load switch.
It is in the boundary or out-of-bounds that described demarcation switch control device is relatively differentiated earth fault according to the size that detects inner zero sequence CT zero-sequence current I0 and ground connection zero sequence definite value I0set, I0 〉=I0set, and when not satisfying alternate overcurrent condition, be judged to earth fault in the boundary; I0＜I0set, and when not satisfying alternate overcurrent condition, be judged to earth fault in the boundary.
Described demarcation switch measure and control device is installed on the cabinet top of demarcation switch.
The beneficial effects of the utility model are: along with the continuous development of distribution automation, intelligent monitoring software has been widely used in the practice, and figure shows, monitoring in real time, and functions such as data acquisition storage have all realized and have been applied in the actual engineering.But present monitoring software adopts serial ports more, cable communicating technologies such as Internet, and it is in cost of investment, and there are some drawbacks in aspects such as autgmentability.Along with the development of wireless communication devices maturation, especially by the GSM of mobile public network the low cost of GPRS communication, the advantage of reliability, the monitoring software of radio communication is adopted in research, be applicable to distribution network automated development more, also relatively more rare based on the monitoring software product of radio communication at present, so we are at the research of this aspect, can improve China's power distribution automation level, improve the power supply reliability of power distribution network.
Description of drawings
Fig. 1 is system configuration schematic diagram of the present utility model.
Embodiment
Below in conjunction with accompanying drawing the utility model is done detailed introduction:
As shown in Figure 1, this distributed demarcation switch intelligence monitoring and controlling device comprises demarcation switch, and described demarcation switch is connected with the demarcation switch measure and control device, and demarcation switch, service entrance switch and looped network go out wiretap and be connected with transformer by outlet, bus; The demarcation switch measure and control device is connected with monitoring server by wireless network; The demarcation switch measure and control device is used for remote control on/off switch switch, after in the user circle phase fault taking place, at transformer station's feeder line breaker open operation, after the circuit dead electricity, starts electromagnetic trip tripping demarcation load switch; After in the user circle single phase ground fault taking place, directly start electromagnetic trip tripping demarcation load switch.When system side direct-to-ground capacitance C1 much larger than load side direct-to-ground capacitance C2 the time (C1 is the hundreds of of C2 and even thousands of times usually), we can arrange zero sequence overcurrent definite value I0set, detected zero-sequence current I0 〉=I0set is judged to earth fault in the boundary when the demarcation switch controller, as I0＜I0set, be judged to earth fault in the boundary; The value of I0set should satisfy I02＜I0set＜I01, and considers a safety factor and margin of safety, as gets I0set=2I02.If the load side circuit is cable, then the C2 value obviously increases, and should verify I02, I0set after calculating I01 value and I02 value according to actual cable electric capacity, I01, the relation between the three satisfies I02＜I0set＜I01 with the correct selectivity of the earth fault of the controller of guaranteeing to demarcate.
Demarcation switch: demarcation switch detects ground connection, short trouble function automatically, when user's branch line generation single phase ground fault, this supervisory control system realizes automatic brake separating by differentiating zero-sequence current, gets rid of the fault branch line, guarantees other branch's user security operation on transformer station and the feeder line.When user's branch line generation phase fault, this supervisory control system is by judging overcurrent and memory, and after transformer station's outlet protection tripping operation, separating brake gets rid of faulty line immediately; After transformer station went out wiretap and send electricity again, faulty line was isolated, and the user of other branch on the feeder line is restored electricity rapidly.The main line switch detects ground connection, short trouble positioning function: when the distribution main line is short-circuited or earth fault the time, the main line switch can be made a response rapidly, and ground connection and short trouble are made effective location, and will deliver to background system on the fault message.
1) adopt hermetically sealed all insulation hybrid gas insulation switchgear, switchgear should be international technology leading joint brand switchgear or foreign brand name switchgear, guarantees the switch whole reliability;
2) the capital equipment parts should be by a complete set of type approval test of domestic authoritative institution;
3) must satisfy to the real-time collection of three-phase current and zero-sequence current and on give;
4) measure and control device must satisfy to the real-time collection of three-phase voltage and on give, and can calculate customer charge amount and power factor in real time;
5) the demarcation switch measure and control device possesses breaker unit and load switching unit adaptation function, possesses " three is distant " function;
6) measure and control device is supported GSM short message and the wireless mixing communication mode of GPRS, possesses 485 serial communications simultaneously, and the ability that inserts distribution automation system is arranged.
7) switch carries out temperature rise test before and after mechanical endurance test.Test by GB11022-1999, temperature rise should be in acceptability limit, and the difference of major loop resistance is no more than 20% before and after the temperature rise test, for palp shell and cover plate, its temperature rise must not surpass 30K, to touching but normal operation need not to touch, must not surpass 40K;
8) switch carries out the rated load electric current by the number of times of table 6 regulation among the GB3804-2004 and cut-offs, closes and close under specified inflation threshold pression, and test is closed in the pass of rated short circuit current.Cut-off fracture before and after the drop-out current and should be able to bear industrial frequency experiment voltage 48kV/1min and the withstand voltage 85kV positive-negative polarity of lightning impulse each 15 times;
9) operating mechanism of switch is: manual/electric closes a floodgate, the manual/electric separating brake, operating voltage is AC220V, energy storage motor is answered action message in 85%～110% rated voltage, when separating brake adopts the tripping coil separating brake, switching winding should be direct current 48V, and coil is at 65%～120% range of nominal tension planted agent action message;
10) indicate one-off pattern on the switch cubicle guidance panel and intend connecting line, have obvious switch " branchs ", " closing " to indicate, clearly identification switch branch, closing position behind the installation and operation.And must guarantee divide, close a floodgate indication and switch branch, combined floodgate physical location are corresponding consistent.Switch is equipped with manual on/off switch action bars, in order to use manual manipulation mode deciliter switch when urgent;
11) machinery five anti-requirements are satisfied in the operation of switch cubicle;
12) guarantee the air seal of switch cubicle casing in manufacturing process, before the switch inflation, should carry out cleaning in the case, guarantee cleaning in the casing.Switch has effective guarantee security of operation in lifetime, prevents the measure of condensation, installs adsorbent in the case additional;
13) switch cubicle should arrange pressure point of release or zone, the personal security around the support equipment operation;
14) spraying outdoor powder in switch cubicle surface guarantees antirust;
15) special-purpose ground connection row and ground connection sign are set, make things convenient for ground lead to connect;
16) each element of the control of operating mechanism, interlock, signal circuit and secondary circuit itself should be able to bear industrial frequency experiment voltage 2kV/1min.
17) current transformer
Adopt 3 phase integral type current transformers, integrated phase CT(A phase, B phase, C phase), 1 zero sequence CT.Phase CT no-load voltage ratio 600/1 or 600/5, nominal load 5VA, 10P20, heat-stable current 20kA, 2s.Zero sequence CT no-load voltage ratio 20/1, nominal load 0.5 Ω, 0.1～60A(primary current) section answers the retention wire sexual intercourse, error is less than 5%, and when primary current was 60A ~ 600A, secondary output current effective value was not less than 3A, heat-stable current 20kA, 2s, office puts less than 10pC.
The demarcation switch measure and control device: demarcation switch measure and control device and demarcation switch cabinet body are supporting, possesses remote control on/off switch switching function, have detection failure and protection control function, when in the user circle phase fault takes place after, at transformer station's feeder line breaker open operation, after the circuit dead electricity, start electromagnetic trip tripping demarcation load switch; After in the user circle single phase ground fault taking place, directly start electromagnetic trip tripping demarcation load switch.
1) the cabinet body of demarcation switch measure and control device and demarcation switch is supporting, possesses remote control on/off switch switching function, have detection failure and protection control function, when in the user circle phase fault takes place after, at transformer station's feeder line breaker open operation, after the circuit dead electricity, start electromagnetic trip tripping demarcation load switch, after in the user circle single phase ground fault taking place, directly start electromagnetic trip tripping demarcation load switch;
2) the demarcation switch measure and control device is installed on demarcation switch cabinet cabinet top, and its definite value setting, divide-shut brake control operation and switch manual operation are in same operating surface, and measure and control device is convenient to observation and is safeguarded;
3) the operation principle circuit adopts microcomputer to constitute, and wiring board is taked damascene structures, and prevents handling with three.Measure and control device is aluminum alloy casing, and material thickness is not less than 2.5mm, and spray treatment is made on the surface, and color and switch cubicle body are coordinated.Measure and control device definite value window lid is transparent material, the convenient observation.Measure and control device adopts the aviation connector to be connected with demarcation switch cabinet body.Special-purpose ground lead construction bolt and ground connection sign is set;
4) PT power supply indicator, measure and control device run indicator, self-check of device indicator light, line fault indicator light are set.Line fault indicator light reset button is set.Parameter arranges window should contain project: alternate operating current definite value, zero sequence operating current definite value, zero sequence action delay time.Other protection parameter arranges by the data maintenance mouth.Measure and control device is at the location mark protection parameter list of easy-to-read and the guide of adjusting thereof.All signs are answered fixation, weather-proof;
5) measure and control device inside is equipped with energy-storage travelling wave tube, the back-up source after having a power failure as switch cubicle, and the minimum pass of can splitting is carried out sub-switching operation one time in the 90S after power supply has a power failure, and energy-storage travelling wave tube can be finished the needs of event communication in the 180S after power supply has a power failure; Power loss during operate as normal, working power loop＜10W, electric power loop＜10W during the protection action; Alternating current loop＜0.5VA/ phase.Operate time of protection≤40ms;
6) the fixed value adjusting scope can adapt to the neutral point of electric network isolated neutral system, through arc suppression coil earthing system with through the low resistance earthing system;
7) in arc suppression coil earthing system, the earth fault aftercurrent may be less than the capacity current over the ground of demarcation switch load side cable line, but measure and control device must satisfy demarcation switch load side 5km with the detection requirement of interior length cables earth fault current;
8) even malfunction indicator lamp power supply dead electricity after fault also can satisfy flicker automatic involution in 48 hours or hand push button resets, or after the handling failure, switch combined floodgate fault warning involution, with easy-to-look-up fault, action indicator is installed on the measure and control device definite value window guidance panel;
9) insulation property: 1. insulation resistance, each circuit is respectively and between ground (being shell or the non-live metal part that exposes), between alternating current circuit and the alternating voltage circuit, between alternating current circuit and the DC circuit, be that the tester of 500V is measured its insulating resistance value and should be not less than 100M with open circuit voltage.2. dielectric strength, product can bear the 2kV power frequency withstand test, does not have to puncture or the flashover phenomenon;
10) surge voltage: each circuit of product is respectively and between ground (being shell or the non-live metal part that exposes), and between alternating current circuit and the alternating voltage circuit, should be able to bear the check of surge voltage in short-term of standard lightning wave, the peak value of check voltage is 5kV.Withstand shocks behind the voltage, the product main performance index should meet the requirement of this standard, in checkout procedure, allow to occur not causing the flashover of insulation damages, if flashover then should be checked insulation resistance and dielectric strength, dielectric strength check this moment magnitude of voltage is 75% of setting;
11) wet-hot aging performance: device should be able to bear the cyclic damp heat test of GB/T7261-2000 the 20th chapter regulation.Before off-test in the 2h, measure each galvanic circle to exposing between non-charged conducting position and the shell, the electric insulation resistance of between unrelated each loop, its insulating resistance value should be less than 1.5M Ω; Dielectric strength be not less than 5.6.2 regulation dielectric strength test voltage value 75%;
12) antijamming capability: bear the High-frequency Interference ability, the pertinent regulations of pressing among the GB/T15153.1 are carried out.Product should be able to bear the High-frequency Interference of the harsh grade IV of 4.10 regulations among the DL/T721-2000.Bear the static discharge interference performance, the pertinent regulations of pressing among the GB/T15153.1 are carried out.The static discharge that product should be able to bear the harsh grade IV of 4.13 regulations among the DL/T721-2000 disturbs.Bear the surge interference performance, the pertinent regulations of pressing among the GB/T15153.1 are carried out.The surge that product should be able to bear the harsh grade IV of 4.12 regulations among the DL/T721-2000 disturbs.Bear the fast transient interference performance, the pertinent regulations of pressing among the GB/T17626.4 are carried out.The fast transient that product should be able to bear the harsh grade IV of 4.11 regulations among the DL/T721-2000 disturbs.
Intelligent distributed cable branch monitoring switch and fault isolation device are to solve the ideal scheme that user branch earth fault involves accident, intelligent distributed cable branch monitoring switch and fault isolation system by demarcation load switch controller and background monitoring software form have the remote transmission ability, can local on-line monitoring, the real-time distributed low current grounding isolation warning system of long-range timely notice.Wherein demarcation load switch controller and user demarcation vacuum load switch are formed the user demarcation load switch complete set of equipments, when power distribution network load side generation single phase ground fault, the demarcation load switch controller is the isolated fault interval rapidly, guarantee non-failed subs criber not influenced by involving of failed subs criber and cause power failure, simultaneously, the demarcation load switch controller is delivered to fault message in the background monitoring main frame or is passed through GSM SMS notification maintainer in time.Background host computer is outside realizing that fault message shows in real time, can also realize that localization of fault, fault waveform show, fault message changes the GSM SMS notification, demarcation switch remote control deciliter, gather current and voltage data and the switch running status at each loaded termination place in real time simultaneously, for fast processing fault, load switching etc. provides science, accurate data foundation, thereby effectively improve the intelligent level of power distribution network.
Intelligent distributed cable branch monitoring switch and fault isolation device are applicable to new clothes and the transformation of 10kV distribution line user T access port place, town and country control appliance.The extensive use of this system, improved the trouble shoot efficient of user branch low current grounding, the accuracy that has improved the low current grounding location, the related incidents that has reduced fault-free user greatly and had a power failure, dwindle the fault outage scope, shorten customer outage hours, thus improve with user's power supply reliability.
The utility model is not limited to above-mentioned execution mode; no matter do any variation in its shape or material formation; every employing structural design provided by the utility model all is a kind of distortion of the present utility model, all should think within the utility model protection range.
Claims (3)
1. a distributed demarcation switch intelligence monitoring and controlling device comprises demarcation switch, it is characterized in that: described demarcation switch is connected with the demarcation switch measure and control device, and demarcation switch, service entrance switch and looped network go out wiretap and be connected with transformer by outlet, bus; The demarcation switch measure and control device is connected with monitoring server by wireless network; The demarcation switch measure and control device is used for remote control on/off switch switch, after in the user circle phase fault taking place, at transformer station's feeder line breaker open operation, after the circuit dead electricity, starts electromagnetic trip tripping demarcation load switch; After in the user circle single phase ground fault taking place, directly start electromagnetic trip tripping demarcation load switch.
2. distributed demarcation switch intelligence monitoring and controlling device according to claim 1, it is characterized in that: it is in the boundary or out-of-bounds that described demarcation switch control device is relatively differentiated earth fault according to the size that detects inner zero sequence CT zero-sequence current I0 and ground connection zero sequence definite value I0set, I0 〉=I0set, and when not satisfying alternate overcurrent condition, be judged to earth fault in the boundary; I0＜I0set, and when not satisfying alternate overcurrent condition, be judged to earth fault in the boundary.
3. distributed demarcation switch intelligence monitoring and controlling device according to claim 1 and 2, it is characterized in that: described demarcation switch measure and control device is installed on the cabinet top of demarcation switch.
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| CN103605357A (en) * | 2013-11-20 | 2014-02-26 | 国电南瑞科技股份有限公司 | Test system for power distribution network boundary switch control apparatus |
| CN103606909A (en) * | 2013-12-04 | 2014-02-26 | 国家电网公司 | Protecting system and method for power distribution network circuit |
| CN103683232A (en) * | 2013-12-26 | 2014-03-26 | 杭州国电电气设备有限公司 | GPRS (General Packet Radio Service) monitoring method, device and system for demarcation load switch |
| CN103887777A (en) * | 2014-03-31 | 2014-06-25 | 国网上海市电力公司 | Automatic feeder protecting method for overhead line four-section three-contact structure |
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| CN105119253A (en) * | 2015-09-14 | 2015-12-02 | 国家电网公司 | Demarcation switching zero-sequence current protection setting value calculation method |
| CN105911396A (en) * | 2016-05-26 | 2016-08-31 | 国网山东省电力公司临朐县供电公司 | Boundary switch simulation test diagnosis device |
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