CN202948040U - Intelligent electric energy meter having power failure monitoring and protection functions - Google Patents
Intelligent electric energy meter having power failure monitoring and protection functions Download PDFInfo
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- CN202948040U CN202948040U CN 201220420594 CN201220420594U CN202948040U CN 202948040 U CN202948040 U CN 202948040U CN 201220420594 CN201220420594 CN 201220420594 CN 201220420594 U CN201220420594 U CN 201220420594U CN 202948040 U CN202948040 U CN 202948040U
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Abstract
The utility model relates to an intelligent electric energy meter having power failure monitoring and protection functions. The provided intelligent electric energy meter consists of a metering chip, a leakage current sampling circuit, a phase current sampling circuit, a phase voltage sampling circuit, a central processing unit (CPU), a power supply module, and a low-voltage circuit breaker. Specifically, the leakage current sampling circuit is electrically connected with the metering chip that is electrically connected with the CPU; the CPU is electrically connected with the low-voltage circuit breaker by a tripping output interface; and the low-voltage circuit breaker is electrically connected with the CPU by a state acquisition interface. According to the utility model, the beneficial effects are as follows: the reliable power failure protection control power supply module is provided and various types of power failure alarm and protection can also be provided, thereby realizing failure alarming and failure protection with the types of voltage, current and power and the like of the power user can be realized; the prevention and failure point isolation can be realized; economic losses and occurrences of personnel safety accidents due to the electrical circuit equipment failure of the user can be prevented and reduced; and the reliability of the low-voltage power grid can be effectively improved.
Description
Technical field
The utility model relates to low voltage electric network power measurement protection apparatus field, relates in particular to a kind of intelligent electric energy meter with electricity consumption malfunction monitoring defencive function.
Background technology
According to the definition of State Grid Corporation of China's intelligent meter, intelligent electric energy meter is comprised of measuring unit, data processing unit, communication unit etc., has the electric energy meter of the functions such as electrical energy metering, information storage and processing, Real-Time Monitoring, control automatically, information interaction.Therefore, existing intelligent electric energy meter does not possess electricity consumption malfunction monitoring and defencive function.
Intelligent low-pressure device for switching art equipment had been obtained very much progress in recent years; occurred as Intelligent switchs such as intelligent low-pressure comprehensive protection device, intelligent electricity leakage protector, intelligent breakers; its major function is the low-voltage circuit control and protection; the protection type that relates generally to has overvoltage, under-voltage, decompression, overcurrent, short circuit, electric leakage (residual current) etc.; and some intelligent switch electrical equipment also have communication function, can realize the remote monitoring of device for switching ruuning situation.But these intelligent switch electrical equipment also exist some shortcomings, as: be difficult to realize realize interactive with higher level's electrical network smart machine and system; Need to set up independently communication and supervisory system, the construction maintenance cost is high.Therefore, also there is larger difficulty by large scale application intelligent switch electrical equipment in power consumer.
In addition, the raising along with power supply reliability requires constantly increases with the dual power supply user due to power autonomous in recent years, causes being on the increase from the anti-power transmission event of user's side direction low voltage electric network, and low voltage electric network maintenance personal's personal safety in serious threat.According to the data of retrieval, at present domestic also do not have can be for preventing specially from the protectiveness Intellectualized Switchgear of the anti-power transmission of user's side at low voltage electric network.
State Grid Corporation of China proposes the strong intelligent grid of Accelerating The Construction during " 12 ", and the main feature of strong intelligent grid is " informationization, robotization, interactive ".The gordian technique that need to relate at low-voltage distribution, with electrical domain mainly contains intelligent power two-way interaction technology, Self-Service technology by all kinds of means, client's intelligent fault administrative skill, safety on line multiplexe electric technology etc.
Low voltage electric network is the weakest link of technology and equipment that intelligent grid is built, and the technology and equipment in existing low voltage electric network field all is difficult to satisfy the demand of intelligent grid at present.Be embodied in; intelligent electric energy meter still is confined to electric energy metrical, charging and relevant information interaction function; the intelligent low-pressure device for switching still is confined to electric monitoring and electric protection aspect function, also there is no a kind of intelligent terminal that has simultaneously intelligent electric energy meter and intelligent switch electrical equipment two aspect functions.
Intelligent electric energy meter is mounted in a kind of intelligent terminal between low voltage electric network and power consumer line facility property right circle point, is " nerve ending " of " intelligent grid " Medial ﹠ Low Voltage Power Network part.Take intelligent electric energy meter as carrier, expand intelligent electric energy meter in the function aspect electrical measurement, protection control, malfunction monitoring analysis, power information interaction, power supply enterprise and power consumer are all had very strong practical value.Therefore; a kind of intelligent electric energy meter with electricity consumption malfunction monitoring defencive function of utility model; intelligent terminal equipment as integrating the functions such as metering and billing, switch, measurement, protection control, on-line monitoring, communication, electricity consumption interaction will greatly promote the intelligent grid construction in the development aspect low-voltage distribution, electricity consumption.
The utility model content
﹠lt, b TranNum="70" ﹠gt, ﹠lt, / b ﹠gt, the technical problems to be solved in the utility model is: overcome the deficiencies in the prior art, a kind of intelligent electric energy meter with electricity consumption malfunction monitoring and defencive function is provided, with the electricity consumption working condition measuring, fault analysis, the fault isolation protection, the fault remote monitoring, the functions such as power information interaction are included the intelligent electric energy meter envelop of function in, make intelligent electric energy meter have the protection of electricity consumption malfunction monitoring and warning function, automatic analysis isolated fault point as required, cover network channel and the equipment that shares with the power information acquisition system, compatible power information acquisition system communication protocol, power information acquisition system main website can realize take intelligent electric energy meter as the terminal management carrier remote failure monitoring management to power consumer.By improving, can also improve the anti-stealing electricity function and the generation that prevents the dangerous electricity consumption behavior of part of intelligent electric energy meter.
The monitoring of intelligent electric energy meter described in the utility model and protection to as if electric wiring and the equipment of electric energy meter downside, monitoring and protection type comprise: the type emergency protections such as overvoltage, under-voltage, decompression, overcurrent, short circuit, electric leakage (residual current), anti-power transmission.
﹠lt, b TranNum="74" ﹠gt, ﹠lt, / b ﹠gt, the technical scheme that the utility model adopts is: a kind of intelligent electric energy meter with electricity consumption malfunction monitoring defencive function, comprise computation chip, the leakage current sample circuit, phase current sampling circuit, the phase voltage sample circuit, central processor CPU, low-voltage circuit breaker, described leakage current sample circuit electrically connects described computation chip, described computation chip and central processor CPU electrically connect mutually, described central processor CPU electrically connects described low-voltage circuit breaker through a tripping operation output interface, described low-voltage circuit breaker electrically connects described central processor CPU through a state acquisition interface, it is characterized in that, also comprise power module.Power module comprises the circuit components such as voltage stabilizing, rectification, charging and battery.
Preferably, described power module comprises rechargeable battery.
Preferably, also comprise communication interface, communication module, long-range main website, described communication interface is electrically connected to mutually with described central processor CPU, communication module respectively, adopts data communication protocol mutually to carry out communication between described long-range main website and communication module.
Preferably, also comprise communication interface, communication module, concentrator, long-range main website, described communication interface is electrically connected to mutually with described central processor CPU, communication module respectively, adopts respectively data communication protocol mutually to carry out communication between described long-range main website and concentrator, described concentrator and communication module.
Preferably, described low-voltage circuit breaker comprises shunt release and auxiliary contact, and described tripping operation output interface electrically connects shunt release, and described auxiliary contact electrically connects the state acquisition interface.
Preferably, also comprise protection control switch and tripping relay, described protection control switch and tripping relay are serially connected on the output control loop of output interface.
Further, also comprise keyboard, display screen, audible-visual annunciator, described keyboard electrically connects described central processor CPU, and described central processor CPU electrically connects respectively described display screen, audible-visual annunciator.
Further, described display screen be used for to show the protection dependent event information of electric weight, the electricity charge, power, table meter fault and overcurrent, short circuit, overvoltage, under-voltage, decompression, electric leakage, anti-power transmission fault
Further, described audible-visual annunciator is used for prompting electric energy meter operating condition, communications status, electric energy meter abnormality, relevant emergency protection information.
Further, described data communication protocol carries out function and expands on the communication protocol of " power consumer power information acquisition system " and technical manual, and the agreement after expansion realizes backward compatible acquisition system and equipment, common user communication passage.
Further, described intelligent electric energy meter and long-range main station system or remote administration terminal are carried out two-way communication by data communication protocol, and accept the management of long-range main station system or remote administration terminal.
Further, described central processor CPU electrically connects mutually with a clock module respectively, mutually electrically connects with a data-carrier store.
Adopt electricity consumption malfunction monitoring and the control method of above-mentioned intelligent meter, comprise the following steps,
Step 1: one or more composite signals in the leakage current signal that the ac voltage signal that the ac current signal that the described phase current sampling circuit in intelligent electric energy meter gathers, described phase voltage sample circuit gather and described leakage current sample circuit gather are converted to digital signal, import described computation chip into and carry out the data processing, and deposit in working storage;
Step 2: pre-stored various protection setting valves or the warning setting valve that has by long-range main website or intelligent electric energy meter key-press input in described data-carrier store, described central processor CPU constantly reads or receives the data from computation chip, and compare with corresponding protection setting valve or warning setting valve, the judgement intelligent electric energy meter connects the residing duty of user load lateral circuit;
Step 3: in the data value that reads or receive is in the setting valve scope of normal operating conditions, do not start corresponding failure protection and warning subroutine, described central processor CPU is added up data analysis, form the statisticss such as interior mean value of unit interval, maximal value, minimum value, and on display screen, and regularly related data is uploaded, is forwarded to long-range main website through concentrator, or directly upload to long-range main website, data storage and analysis so that long-range main website leaks electricity, then return to step (2); When exceeding or during lower than the setting valve scope, starting corresponding failure protection and warning subroutine, carry out further fault judgement; According to comprehensive judged result, central processor CPU sends the trip protection instruction to described low-voltage circuit breaker, the shunt release action open-circuit line in described low-voltage circuit breaker, or send alarm command to audible-visual annunciator, report to the police;
Step 4: by described central processor CPU will report to the police, the implementation status of emergency protection trip event and emergency protection or warning forms the event of failure message with timestamp; the data writing storer; and show on display; described intelligent electric energy meter is uploaded dependent failure event message and data in real time; be forwarded to long-range main website through concentrator; or directly uploading to long-range main website, long-range main website carries out the data storage and analyzes.
Preferably, described central processor CPU compares the overvoltage that prestores in the current ac voltage signal data that gather and described data-carrier store, under-voltage, decompression setting valve, when phase voltage value〉during the overvoltage setting valve, satisfy overvoltage fault verification entry condition; When phase voltage value＜under-voltage setting valve and current voltage value〉during the decompression setting valve, satisfy under-voltage fault verification entry condition; When phase voltage value＜decompression setting valve, satisfy no-voltage fault and judge entry condition; When magnitude of voltage numerical value meets above-mentioned scope; the protection of intelligent electric energy meter trigger voltage class and warning subroutine; carry out further fault judgement, comprehensively judge according to data such as voltage swing, fluctuation situation, out-of-limit duration, low-voltage circuit breaker divide-shut brake location statuss.
Preferably, described central processor CPU compares overcurrent, the short circuit setting valve that prestores in the current ac current signal data that gather and described data-carrier store, when phase current values〉during the over-current adjusting value, satisfy over current fault and judge entry condition; When phase current values〉during the short circuit setting valve, satisfy short trouble and judge entry condition; When current value numerical value meets above-mentioned scope; intelligent electric energy meter starting current class protection subroutine and warning subroutine; carry out further fault judgement, comprehensively judge according to data such as phase current size, fluctuation situation, out-of-limit duration, low-voltage circuit breaker divide-shut brake location statuss.
﹠lt, b TranNum="106" ﹠gt, ﹠lt, / b ﹠gt, preferably, described central processor CPU is with current active power or current data and the null value with direction symbol that gather, anti-power transmission protection power setting valve compares, when active power value＜0 and active power absolute value〉when anti-power transmission is protected the power setting valve, or when phase current values＜0 and phase current absolute value〉during anti-power transmission protective current setting valve, intelligent electric energy meter starts anti-power transmission class emergency protection and warning subroutine, carry out further fault judgement, according to reverse active power or size of current, the fluctuation situation, the reverse out-of-limit duration, the data such as low-voltage circuit breaker divide-shut brake location status comprehensively judge.
﹠lt, b TranNum="108" ﹠gt, ﹠lt, / b ﹠gt, compared with prior art, the beneficial effects of the utility model are: 1, power module is provided, for low-voltage circuit breaker provides reliable and stable protection action control power supply, improve reliable rate and the protection action accuracy of whole device, and reduce the failure rate of low-voltage circuit breaker trip operation mechanism, for the intelligent electric energy meter nucleus module provides the operation back-up source, the operational modes such as the standby of support intelligent electric energy meter nucleus module, dormancy provide condition for resuming operation fast after the intelligent electric energy meter power down, have improved the practicality of failure protection function, 2, polytype electricity consumption fault alarm and protection are provided, electricity consumption emergency protection type comprises overvoltage, under-voltage, decompression, overcurrent, short circuit, electric leakage (residual current), the protection of the types such as anti-power transmission, electricity consumption fault alarm and defencive function by intelligent electric energy meter, can realize power consumer voltage, electric current, the fault alarm of the types such as power and emergency protection, prevention electric fault and automatic separating fault point, the electric leakage situation of Real-Time Monitoring electric wiring and equipment, electric energy loss and economic loss that minimizing causes because of electric leakage, prevent and reduce the economic loss that causes because of the electric wiring equipment failure and the generation of personal safety accident, and effectively improve the reliability of low voltage electric network, 3, provide polytype electricity consumption failure message prompting, intelligent electric energy meter can show relevant failure message and electricity consumption information on its display screen, maintain easily personnel and user and understand intuitively the reason of using electric fault, accurately and timely fix a breakdown and hidden danger, and can accurately distinguish the power-off fault reason and caused by power consumer or caused by power supply enterprise, for power supply enterprise and electric power electricity consumption fault analysis provide foundation, improve power supply reliability and breakdown repair efficient.The back-up source that intelligent electric energy meter is built-in with power module and is powered by rechargeable battery, can continue failure condition is pointed out in a period of time after the intelligent electric energy meter outage, can manually wake up when intelligent electric energy meter changes standby mode over to and carry out data query; 4, the electricity consumption fault management can be included telemanagement in, and especially accessible power consumer power information acquisition system manages.Power supply enterprise includes the electricity consumption fault management in range of management, can analyze low voltage electric network and user power utilization fault pests occurrence rule, in time early warning and take measures to investigate fault and hidden danger improves the intelligent level of low voltage electric network and electricity consumption, effectively instructs power consumer science, safety, efficiently electricity consumption; 5, compatible existing power consumer power information acquisition system and equipment.The utility model carries out function and expands on the communication protocol of " power consumer power information acquisition system " and technical manual, but its great advantage is exactly can backward compatible acquisition system and equipment common user communication passage; 6, have by having increased the current acquisition element that gathers neutral line current or gather simultaneously phase line, neutral line current, can more effectively monitor the electricity filching behavior that adopts current return shunting or short circuit method, improve the function of opposing electricity-stealing of intelligent electric energy meter, and prevent the generation of dangerous electricity consumption behavior, reduce power supply enterprise because measuring economic loss abnormal and that stealing causes.
Description of drawings
Fig. 1 is that the utility model is according to the circuit structure block diagram of the mode one of the object division of nucleus module exchanges data;
Fig. 2 is that the utility model is according to the circuit structure block diagram of the mode two of the object division of nucleus module exchanges data;
Fig. 3 is electricity consumption emergency protection primary control program schematic diagram;
Fig. 4 is that the utility model is according to the circuit structure diagram of the mode one of alternating-current electric signals collecting sensor element type division;
Fig. 5 is that the utility model is according to the circuit structure diagram of the mode two of alternating-current electric signals collecting sensor element type division;
Fig. 6 is that the utility model is according to the circuit structure diagram of the mode three of alternating-current electric signals collecting sensor element type division;
Fig. 7 is the built-in schematic diagram of low-voltage circuit breaker of the present utility model;
Fig. 8 is low-voltage circuit breaker external schematic diagram of the present utility model;
Description of reference numerals: 1, computation chip; 2, leakage current sample circuit; 3, phase current sampling circuit; 4, phase voltage sample circuit; 5, tripping operation output interface; 6, state acquisition interface; 7, low-voltage circuit breaker; 71, auxiliary contact; 72, shunt opening trip coil; 8, communication interface; 9, communication module; 10, data-carrier store; 11, clock module; 12, central processor CPU; 13, audible-visual annunciator; 14, display screen; 15, keyboard; 16, long-range main website; 17, concentrator; 18, power module; 19, zero sequence current mutual inductor L1; 20, voltage transformer (VT) L3; 21, current transformer L2; 22, current transformer L1; 23, current transformer L2; 24, voltage transformer (VT) L3; 25, quantity of state acquisition interface input terminal; 26, tripping operation output interface terminal.
Embodiment
Below in conjunction with accompanying drawing, embodiment of the present utility model is described in further detail.
As shown in Figure 1 and Figure 2; a kind of intelligent electric energy meter with electricity consumption malfunction monitoring and defencive function; comprise computation chip 1, phase current sampling circuit 3, phase voltage sample circuit 4, central processor CPU 12, leakage current sample circuit 2, low-voltage circuit breaker 7, and power module 18.Described leakage current sample circuit 2 electrically connects described computation chip 1, described computation chip 1 electrically connects mutually with central processor CPU 12, described central processor CPU 12 electrically connects described low-voltage circuit breaker 7 through a tripping operation output interface 5, and described low-voltage circuit breaker 7 electrically connects described central processor CPU 12 through a state acquisition interface 6.Described leakage current sample circuit 2 comprises the leakage current pick-up transducers.
Also comprise communication interface 8, communication module 9, keyboard 15, display screen 14, audible-visual annunciator 13, described communication interface 8 is electrically connected to mutually with described central processor CPU 12, communication module 9 respectively, the described keyboard 15 described central processor CPUs 12 of access, described central processor CPU 12 electrically connects respectively described display screen 14, audible-visual annunciator 13.Described central processor CPU 12 and a clock module 11 electrically connect mutually.Described central processor CPU 12 and a data-carrier store 10 electrically connect mutually.
The leakage current sample circuit is responsible for low-voltage leakage electric current AC analogue signal is converted to digital signal, and imports the leakage current digital signal into computation chip and carry out data and process.In the leakage current sample circuit, most important element is the leakage current pick-up transducers, the leakage current pick-up transducers is the AC analogue signal conversion element of leakage current, with the line electrical leakage current signal by a certain percentage relationship conversion be to be suitable for the AC signal that the leakage current sample circuit is processed, the leakage current sample circuit will leak electricity and output to computation chip after the AC analogue signal is converted to digital signal, carry out the leakage current digital signal processing by computation chip.The leakage current pick-up transducers can adopt the leakage current signals such as current transformer or shunt resistance to gather sensing element.Phase current sampling circuit, phase voltage sample circuit are converted to respectively with phase current, the phase voltage AC analogue signal of three-phase or single-phase low-voltage circuit the digital signal that the proper measurement chip gathers, and import voltage, current digital signal into computation chip and carry out data and process, form the measurement data such as electric current, voltage, electric power, electric weight.Voltage, current sampling circuit comprise sensor element, are generally voltage, current transformer or dividing potential drop, shunt resistance element.Computation chip is a kind of digital signal processing (Digital Singnal Processing that the electric signals such as electric energy metrical and voltage, electric current are processed that is specifically designed to, be called for short DSP) chip, in the utility model, computation chip not only is responsible for phase current, phase voltage digital signal are converted to power and electric weight by calculation process, also be responsible for phase voltage, phase current, leakage current digital signal are converted to effective value by calculation process, and related data be stored in the working storage of computation chip.CPU is the core parts of intelligent electric energy meter; the general embedded microprocessor that adopts; be that intelligent electric energy meter realizes that Protection parameters adjusts, protects judgement and send the protection Intelligent treatment core parts of instruction, and responsible data parameters storage administration, peripheral hardware are controlled and the tasks such as Control on Communication.Data-carrier store also is used for stored electricity data (phase voltage, phase current, leakage current etc.), parameter and event information except being used for the data such as storage of electrical energy metering, charging and table meter event.The tripping operation output interface is used for to low-voltage circuit breaker output tripping operation control wave or level signal, realizes the tripping operation of low-voltage circuit breaker is controlled.The tripping operation output interface comprises a tripping relay, is used for controlling the output of trip signal.The tripping operation output interface also comprises protection control switch, and on the output control loop of protection control switch serial connection tripping operation output interface, whether the emergency protection trip avoidance function that is used for the setting intelligent electric energy meter comes into operation.The state acquisition interface is responsible for gathering the divide-shut brake location status amount of low-voltage circuit breaker.Communication interface and communication module are responsible for communicating by letter of intelligent electric energy meter and the intelligent terminals such as concentrator, long-range main website, on-the-spot portable data acquisition PDA.Clock is timing device, and from charged pool, is used for the independent timing of intelligent electric energy meter, and guarantees intelligent electric energy meter still accurately timing when outage, to guarantee the accuracy of failure message time of origin record.Keyboard button, display, acousto-optic are designated as the input-output apparatus of the man-machine interaction of intelligent electric energy meter, are responsible for the defencive function debugging of electricity consumption malfunction monitoring and fault alarm, failure message demonstration.Power module is the circuit module with voltage stabilizing, rectification and charge function, and the normal operation that is responsible for intelligent electric energy meter itself provides stable power supply, and can be the low-voltage control power supply that low-voltage circuit breaker is controlled provides safe and reliable.Power module comprises one group of rechargeable battery power supply in support, can support intelligent electric energy meter to keep later on operation a period of time in dead electricity, carries out data processing, data storage, data communication, demonstration information and sends the operation such as alerting signal; And according to the battery power Expenditure Levels, automatically change standby, dormant state over to, so that the intelligent electric energy meter telegram in reply time resumes operation fast.Low-voltage circuit breaker is a kind of low-voltage circuit breaker with shunt release and auxiliary contact.The effect of shunt release is to realize low-voltage circuit breaker is carried out a kind of contents of sub-switching operation as intelligent electric energy meter, when intelligent electric energy meter tripping operation control interface output sub-gate signal, just connects the shunt opening trip coil power supply, handles the low-voltage circuit breaker separating brake.Auxiliary contact is a kind of contents that low-voltage circuit breaker is used for auxiliary judgment divide-shut brake position, and the moving contact interlock of it and low-voltage circuit breaker is responsible for to the divide-shut brake position state signal of intelligent electric energy meter feedback low-voltage circuit breaker.Low-voltage circuit breaker is that the shunt opening trip coil of low-voltage circuit breaker, auxiliary contact are connected with tripping operation output interface, the state acquisition interface of intelligent electric energy meter respectively for the electrical control equipment that cuts off and recover user load.In the utility model, low-voltage circuit breaker is responsible for when breaking down open failure point or fault power consumer as required, and can disconnect low-voltage circuit breaker or prevent that according to the parameter that long-range main website issues low-voltage circuit breaker from illegally being closed a floodgate according to the instruction of long-range main website.Can select the low-voltage circuit breaker with electric switch-on operating mechanism external accessory, and at intelligent electric energy meter core increase combined floodgate output interface, expand by function, can realize intelligent electric energy meter to the function of low-voltage circuit breaker automatic reclosing, and realize that long-range main website is to low-voltage circuit breaker remote control closing function under intelligent electric energy meter.Concentrator refers to collect the data of each acquisition terminal or electric energy meter; and process storage; energy and power information collection main website or handheld device are carried out the equipment of exchanges data simultaneously; in the utility model, concentrator also is responsible for storage and the forwarding of intelligent electric energy meter failure protection function related data, parameter, event.Long-range main website refers to power information acquisition system main website, is responsible for intelligent electric energy meter is carried out data acquisition and management, also be responsible for to intelligent electric energy meter service data, control parameter and protection and control and carry out telemanagement.
The utility model also provides a kind of electricity consumption malfunction monitoring and control method with intelligent electric energy meter of electricity consumption malfunction monitoring defencive function, comprises the following steps,
(1) one or more composite signals in the leakage current signal that gathers of the ac current signal that gathers of the described phase current sampling circuit in intelligent electric energy meter, ac voltage signal that described phase voltage sample circuit gathers and described leakage current sample circuit are converted to digital signal, import described computation chip into and carry out the data processing, and deposit in working storage;
(2) pre-stored various protection setting valves or the warning setting valve that has by long-range main website or intelligent electric energy meter key-press input in described data-carrier store, described central processor CPU constantly reads or receives the data from computation chip, and compare with corresponding protection setting valve or warning setting valve, the judgement intelligent electric energy meter connects the residing duty of user load lateral circuit;
(3) in the data value that reads or receive is in the setting valve scope of normal operating conditions, do not start corresponding failure protection and warning subroutine, described central processor CPU is added up data analysis, form the statisticss such as interior mean value of unit interval, maximal value, minimum value, and on display screen, and regularly related data is uploaded, is forwarded to long-range main website through concentrator, or directly upload to long-range main website, data storage and analysis so that long-range main website leaks electricity, then return to step (2); When exceeding or during lower than the setting valve scope, starting corresponding failure protection and warning subroutine, carry out further fault judgement; According to comprehensive judged result, central processor CPU sends the trip protection instruction to described low-voltage circuit breaker, the shunt release action open-circuit line in described low-voltage circuit breaker, or send alarm command to audible-visual annunciator, report to the police;
(4) by described central processor CPU will report to the police, the implementation status of emergency protection trip event and emergency protection or warning forms the event of failure message with timestamp; the data writing storer; and show on display; described intelligent electric energy meter is uploaded dependent failure event message and data in real time; be forwarded to long-range main website through concentrator; or directly uploading to long-range main website, long-range main website carries out the data storage and analyzes.
Its emergency protection principle of work and process are as follows:
The monitoring of intelligent electric energy meter and protection to as if electric wiring and the equipment of electric energy meter downside, monitoring and protection content comprise: the type emergency protections such as overvoltage, under-voltage, decompression, overcurrent, short circuit, electric leakage (residual current), anti-power transmission.
For realizing all kinds of electricity consumption emergency protections, in the embedded type CPU core working procedure of intelligent electric energy meter, each emergency protection and warning subroutine are all benefited from electric fault protection primary control program and are controlled.For guaranteeing the real-time of malfunction monitoring protection, embedded type CPU and operating system thereof should be selected the operating system of supporting real-time multi-task.
Electricity consumption emergency protection primary control program after intelligent electric energy meter powers up startup, loads immediately electricity consumption emergency protection primary control program and carries out electricity consumption failure monitoring and protection as shown in Figure 3.Electricity consumption emergency protection primary control program reads from one group of current phase voltage of computation chip, phase current, leakage current numerical value, and phase voltage, phase current, leakage current numerical value are compared with corresponding setting valve respectively.If phase voltage, phase current, leakage current numerical value are out-of-limit; perhaps there is anti-power transmission abnormal signal; check whether corresponding protection subroutine process is in operation; if corresponding protection subroutine is moved; directly turn back to the next item down data decision node; if corresponding protection subroutine off-duty starts corresponding protection subroutine process and further judges, and turns back to the next item down data decision node.After each data item had all relatively been completed with setting valve, flow process turned back to and reads one group of new current phase voltage, phase current, leakage current numerical value node, and carries out cycle criterion by above-mentioned flow process.Because intelligent electric energy meter adopts real-time multi-task operating system; therefore intelligent electric energy meter is supported multinomial fault type parallel detection simultaneously protection; operating system creates the corresponding failure process according to different fault-signal types temporarily; start corresponding protection subroutine; after completing the emergency protection action or after the fault-signal disappearance, operating system automatic stop and this process of release.
Intelligent electric energy meter adopt to support the advantage of the operating system of real-time multi-task to be: just can realize that by a cpu chip a plurality of electric faults such as voltage, electric current, electric leakage, anti-power transmission protect type to move simultaneously; can guarantee that emergency protection is judged and protection action real-time, and can realize the unified coordinated scheduling of dissimilar protection subprogram activation.
Its emergency protection principle of work and process now are described as an example of earth leakage protection example:
Occur to touch when intelligent electric energy meter connects the user load lateral circuit, during electric leakage, the zero sequence current mutual inductor of intelligent electric energy meter inside just generates leakage current, the secondary circuit of zero sequence current mutual inductor is input to after treatment A/D converter with leakage current signal and carries out the collection of leakage current analog signal figure, be digital signal with the leakage current analog signal conversion, and incite somebody to action and import the leakage current digital signal into computation chip and carry out the data processing.Form the data such as leakage current effective value, average data after the leakage current data that computation chip transmits the leakage current sample circuit are processed through mathematical operation, and store data in the working storage of computation chip.CPU constantly reads or receives the leakage current data from computation chip, and real-time leakage current data and earth leakage protection setting valve or warning setting valve are compared, if leakage current value is greater than earth leakage protection setting valve or warning setting valve, start earth leakage protection and warning subroutine, when satisfying earth leakage protection tripping operation trigger condition, CPU exports tripping operation control wave or level signal by the tripping operation output interface to low-voltage circuit breaker, connect the shunt opening trip coil power supply of low-voltage circuit breaker, realize the earth leakage protection tripping operation; When satisfying the leakage-current alarm trigger condition, CPU connects sound and light alarm equipment and carries out leakage-current alarm to sound and light alarm equipment output control signal.Described earth leakage protection setting valve or warning setting valve are earth leakage protection and the alarm parameters by long-range main website or intelligent electric energy meter key-press input; parameter type comprises the parameters such as earth leakage protection setting valve, leakage-current alarm setting valve, earth leakage protection tripping operation delay time, earth leakage protection tripping operation allow/forbid, leakage-current alarm allows/forbids, correlation parameter all is stored in the data-carrier store of intelligent electric energy meter.
Earth leakage protection and warning subroutine are one section computer program codes that intelligent electric energy meter leaks electricity and judges and send trip protection/alarm command; its principle is that the various factors such as the size, fluctuation situation, duration according to leakage current carries out from motion tracking and intelligent decision, whether sends earth leakage protection tripping operation or leakage-current alarm instruction according to judged result and predetermined strategy decision.
Leakage-current alarm, earth leakage protection trip event that the power consumer that intelligent electric energy meter is monitored occurs because of electric leakage; and the implementation status condition of earth leakage protection or leakage-current alarm; form event message with timestamp by CPU; with event message data writing storer, and dependent event information is shown on liquid crystal display.After leakage-current alarm, earth leakage protection trip event occured, intelligent electric energy meter was also uploaded dependent event message and data in real time, is forwarded to long-range main website through concentrator, or directly uploads to long-range main website.
If intelligent electric energy meter connects the load-side leakage current value in normal range, the CPU of intelligent electric energy meter also constantly reads current leakage current value from data-carrier store and carries out analytic statistics, form the statisticss such as interior leakage current mean value of unit interval, maximal value, minimum value, and as required in liquid crystal display screen display related data, and regularly related data is uploaded, is forwarded to long-range main website through concentrator, or directly upload to long-range main website, data storage and analysis so that long-range main website leaks electricity.
Other type Protection principles such as the overvoltage of intelligent electric energy meter, under-voltage, decompression, overcurrent, short circuit, anti-power transmission are consistent with earth leakage protective principle process with process; its difference is service data, controls parameter, event information type difference, and is different from the warning subroutine with performed correspondence protection.
Overvoltage, under-voltage, no-voltage fault Protection principle and process are as follows:
The voltage signal that intelligent electric energy meter gathers by the phase voltage sample circuit, the voltage data after the computation chip computing is not only as the data source of electric weight, power calculation, also as voltage class malfunction monitoring and protection judgment basis such as overvoltage, under-voltage, decompressions.Similar with Leakage Protective Rule, the CPU of intelligent electric energy meter compares the current voltage data that gather and pre-stored overvoltage, under-voltage, decompression setting valve in data-carrier store, when the current voltage value〉during the overvoltage setting valve, satisfy overvoltage fault verification entry condition; When current phase voltage value＜under-voltage setting valve and current voltage value〉during the decompression setting valve, satisfy under-voltage fault verification entry condition; When current phase voltage value＜decompression setting valve, satisfy no-voltage fault and judge entry condition.If current voltage value numerical value meets above-mentioned scope, show and to have voltage class fault, intelligent electric energy meter trigger voltage protection subroutine is carried out further fault judgement, comprehensively judge according to data such as voltage swing, fluctuation situation, out-of-limit duration, low-voltage circuit breaker divide-shut brake location statuss, when meeting the fault alarm condition, output alarm information; When meeting the emergency protection operation condition, export trip command to the tripping operation control interface, control low-voltage circuit breaker disconnect user circuit.Voltage class failure message also shows on the display at intelligent electric energy meter after judging, and real-time report is to long-range main website.
Overcurrent, short trouble Protection principle and process are as follows:
The current data that intelligent electric energy meter gathers by phase current sampling circuit, the current data after the computation chip computing is not only as the data source of electric weight, power calculation, also as current capacity malfunction monitoring and protection judgment basis such as overcurrent, short circuits.Similar with Leakage Protective Rule, the CPU of intelligent electric energy meter compares the current current data that gathers and pre-stored overcurrent, short circuit setting valve in data-carrier store, when current phase current values〉during the over-current adjusting value, satisfy over current fault and judge entry condition; When current phase current values〉during the short circuit setting valve, satisfy short trouble and judge entry condition.If current current value numerical value meets above-mentioned scope, show and to have the current capacity fault, intelligent electric energy meter starting current protection subroutine is carried out further fault judgement, comprehensively judge according to data such as phase current size, fluctuation situation, out-of-limit duration, low-voltage circuit breaker divide-shut brake location statuss, when meeting the fault alarm condition, output alarm information; When meeting the emergency protection operation condition, export trip command to the tripping operation control interface, control low-voltage circuit breaker disconnect user circuit.The current capacity failure message also shows on the display at intelligent electric energy meter after judging, and real-time report is to long-range main website.
Anti-power transmission emergency protection principle of work and process are as follows:
Anti-power transmission refers to power supply through the phenomenon of the reverse power transmission of improper approach, and in low voltage electric network, the principal mode of anti-power transmission is that the low-voltage electricity user side is provided power generating source or double-cricuit supply for oneself to the phenomenon of the reverse power transmission of low voltage electric network.Its harm is when the low-voltage distribution network interruption maintenance, and the anti-power transmission of electric power electricity consumption very easily causes the line facility maintainer to suffer electric shock to cause human casualty accident.
The anti-power transmission emergency protection principle of intelligent electric energy meter described in the utility model is: when intelligent electric energy meter detects the phase line active power of the intelligent electric energy meter of flowing through or electric current when reverse; disconnect immediately low-voltage circuit breaker, disconnect electric power and connect with the electric of low voltage electric network with electric line or equipment.According to the electric energy four-quadrant diagram, when applied power dropped on I or IV quadrant, the power delivery direction was for to be powered to power consumer by low voltage electric network, and its active power and direction of current are forward, belong to normal power transmission state; When applied power dropped on II or III quadrant, the power delivery direction was that its active power and direction of current are oppositely, belong to anti-power transmission state by the power supply of power consumer side direction low voltage electric network side.
﹠lt, b TranNum="162" ﹠gt, ﹠lt, / b ﹠gt, the anti-power transmission emergency protection course of work and other emergency protection process are similar, the CPU of intelligent electric energy meter compares current active power or current data and the null value with direction symbol that gathers, when current active power value＜0 and current active power absolute value〉when anti-power transmission is protected the power setting valve, perhaps when current phase current values＜0 and current phase current absolute value〉during anti-power transmission protective current setting valve, may there be anti-power transmission situation, intelligent electric energy meter starts anti-power transmission emergency protection subroutine and carries out further fault judgement, according to reverse active power or size of current, the fluctuation situation, the reverse out-of-limit duration, the data such as low-voltage circuit breaker divide-shut brake location status comprehensively judge, when meeting the fault alarm condition, output alarm information, when meeting the emergency protection operation condition, export trip command to the tripping operation control interface, control low-voltage circuit breaker disconnect user circuit.Anti-power transmission failure message also shows on the display of intelligent electric energy meter, and real-time report is to long-range main website.
The utility model is according to the electric data of intelligent electric energy meter computation chip collection and the processing of related data, can also expand the failure protection function that other type, as: extendiblely according to three-phase voltage phasing degree order go out Phase-sequence Fault protection (preventing the reversing of power consumer three phase electric machine); Extendiblely according to the multiplying of voltage and electric current go out the out-of-limit emergency protection of power (preventing power consumer electricity consumption overload).
Intelligent electric energy meter described in the utility model; keeping on original power information remote data transfer function basis; by data communication protocol and related software are carried out the expansion improvement of malfunction monitoring protection correlation function; need not to increase private communication, main website hardware device; adopt shared communication medium, communication facilities and main website mode, just can realize remote monitoring and the adjustment of user power utilization emergency protection ruuning situation.
Intelligent electric meter malfunction monitoring protection correlation function data communication protocol expands, and refers to the data communication protocol expansion between intelligent electric energy meter and concentrator, concentrator and power information collection main website.Wherein, communication protocol between intelligent electric energy meter and concentrator expands as the basis take DL/T645-2007 " multifunctional electric energy meter communication protocol ", and between concentrator and power information acquisition system main website, communication protocol expands as the basis take Q/GDW 376.1-2009 " power consumer power information acquisition system communication protocol: main website and acquisition terminal communication protocol ".
Implementation method with the electric fault remote monitoring is as follows:
Telecommunication protocol to intelligent electric energy meter expands.take the leak current fault protection as example, increase the data item such as real-time leakage current, leakage current freezing data, leakage current curve data, increase zero sequence current mutual inductor multiplying power (as measurement point basic parameter item), leakage current thresholding (as earth leakage protection tripping operation action current setting valve), the leakage current upper limit (as leakage current off-limit alarm current setting), leakage current is got over the thresholding duration (earth leakage protection tripping operation delay time), leakage current is got over the upper limit duration (leakage-current alarm delay time), leakage current is got over the thresholding coefficient of restitution, leakage current is got over measurement point limit value parameter and the Protection parameters such as upper limit coefficient of restitution, increase the earth leakage protections such as the earth leakage protection tripping operation allows/forbids, leakage-current alarm allows/forbids and control parameter, increase the event projects such as earth leakage protection trip event, electric leakage off-limit alarm event.Voltage class emergency protection and the current capacity emergency protections such as overcurrent, short circuit such as overvoltage, under-voltage, decompression, and anti-power transmission emergency protection, the extending method of its communication protocol is similar to the earth leakage protection type, no longer carefully states one by one.For realizing the compatibility of main website and intelligent electric energy meter function, the concentrator that is connected with intelligent electric energy meter, the communication protocol of main website also communicate as stated above agreement and expand.
The adjustment of malfunction monitoring protection correlation parameter issues.By the parameter management software functions such as the electric leakage of main website, overvoltage, under-voltage, decompression, overcurrent, short circuit, anti-power transmission are improved.Take earth leakage protection as example, increase more thresholding duration, leakage current upper limit duration, leakage current thresholding coefficient of restitution, leakage current electric leakage correlation parameter management functions such as more upper limit coefficient of restitution, earth leakage protection tripping operation allow/forbid, electric leakage off-limit alarm allows/forbids more more of zero sequence current mutual inductor multiplying power, leakage current thresholding, the leakage current upper limit, leakage current.Complete the setting of correlation parameter in main website after, correlation parameter is formed message in batches or passes to intelligent electric energy meter one by one under concentrator forwards, intelligent electric energy meter is verified, is resolved the parameter message that receives, and the parameter that main website is issued is stored in data-carrier store.The voltage class emergency protections such as overvoltage, under-voltage, decompression, the current capacity emergency protections such as overcurrent, short circuit, and the isoparametric adjustment of anti-power transmission emergency protection issues also similarly with the Parameters of Earth-Leakage Protection delivery method, no longer carefully states one by one.
The remote monitoring of intelligent electric energy meter ruuning situation and emergency protection.The intelligent electric energy meter timing automatic uploads to main website in the data message mode through concentrator with real time data, freezing data, the curve data of the types such as the leakage current that collects, phase voltage, phase current, main website verifies the data message that receives, resolve, and with the data write into Databasce, carry out data exhibiting and demonstration by main website.Intelligent electric energy meter detects with after after electric fault, the corresponding protection of automatic startup and warning subroutine are processed; and formation emergency protection trip event or electric protection numerical value off-limit alarm event message; relevant event information is uploaded to main website through concentrator automatically in the event message mode, further processed by main website.If main station monitoring personnel need the current or historical failure monitoring and protecting relevant information of inquiry intelligent electric energy meter; can send failure message from main website and call the survey order together; intelligent electric energy meter passes to main website with relevant information with message after receiving and calling the survey order together immediately automatically in form.
Electricity consumption situation and error information displaying method are as follows:
In normal electricity consumption situation, but the display screen automatic turning screen display of intelligent electric energy meter is shown the data such as information that current voltage, electric current, leakage current, power, electric weight, the electricity charge, time, main website issue; When occuring to use electric fault, the display screen of intelligent electric energy meter can show the information such as electricity consumption fault type, failure cause, fault-time; When the generation electric network fault causes the intelligent electric energy meter dead electricity, rely on the support of built-in back-up source, the display screen of intelligent electric energy meter still can provide the power information of a period of time to show, provide the coherent reference information of power-off event for repair personnel and user, exactly failure judgement type and the source of failure.When back-up source be depleted to a certain degree or the certain hour that cuts off the power supply after, intelligent electric energy meter changes the low power consumpting state of standby automatically over to, closes all peripheral hardwares and peripheral circuit power supply, only gives the internal memory power supply of intelligent electric energy meter core.When needing to inquire about intelligent electric energy meter for information about the time under power down mode, can wake intelligent electric energy meter up by the manually-operated keyboard button and carry out information inquiry.After the intelligent electric energy meter telegram in reply, can experience operating system and reboot start-up course, can return to rapidly normal operating condition, guarantee measurement accuracy, guarantee that every failure protection function in time puts into operation.
The utility model is pressed the difference of the connected mode of intelligent electric energy meter nucleus module exchanges data, and two kinds of embodiments are arranged:
Mode one: as shown in Figure 1, the communication interface 8 of nucleus module is electrically connected to mutually with central processor CPU 12, communication module 9 respectively, adopts data communication protocol mutually to carry out communication between long-range main website 16 and communication module 9.
Mode two: as shown in Figure 2, also comprise concentrator 17, adopt respectively data communication protocol mutually to carry out communication between the communication module 9 of long-range main website 16 and concentrator 17, concentrator 17 and nucleus module.Concentrator 17 is collected the data of each acquisition terminal or electric energy meter, and stores, and can realize simultaneously that electric energy meter and power information gather the exchanges data of main website or hand-held intelligent terminal equipment.
It is different with the type of combination that the utility model is pressed the element selection of alternating-current electric signals collecting sensor in leakage current sample circuit, phase current sampling circuit, phase voltage sample circuit, and three kinds of embodiments are arranged:
Mode one: as shown in Figure 4, adopt mutual inductor type acquisition elements, zero sequence current mutual inductor L119 gathers leakage current, and current transformer L221 gathers the phase line current, and voltage transformer (VT) L320 gathers phase voltage.
Mode two: as shown in Figure 5, adopt mutual inductor type acquisition elements, current transformer L122 gathers the phase line current, and current transformer L223 gathers neutral line current, and voltage transformer (VT) L324 gathers phase voltage.Leakage current obtains the instantaneous numerical value of leakage current by the instantaneous value of phase line current, neutral line current through computation chip mathematical operation stack.For improving the acquisition precision of leakage current, current transformer L1, L2 should adopt the electrical specification current transformer consistent with parameter.
Mode three: as shown in Figure 6, adopt dividing potential drop, shunt resistance type acquisition elements.Resistance R 1, R2 consist of the shunt resistance circuit jointly, wherein, the R1 resistance value is less, the R2 resistance value is larger, the ratio 1:N of R1 and R2 resistance value, wherein N is integer, resistance R 1 is connected on phase line, resistance R 2 outputs to the partial current signal phase line current acquisition terminal on divided circuit, the current signal that computation chip collects is 1/(N+1) doubly phase line current.Resistance R 3, R4 jointly consist of the shunt resistance circuit and are used for gathering neutral line current, and acquisition method is identical with the phase line acquisition method.Resistance R 5, R6 series connection consist of the divider resistance circuit and are used for gathering phase voltage between phase line, zero line, wherein, the R5 resistance value is larger, the R6 resistance value is less, R5 is M:1 with the ratio of R6, wherein M is integer, and the voltage signal at R6 two ends outputs to phase voltage and gathers terminal, and the voltage signal that computation chip collects is 1/(M+1) doubly phase line voltage.Identical with mode two, leakage current obtains numerical value by the instantaneous value of phase line current, neutral line current through computation chip mathematical operation stack, for improving the acquisition precision of leakage current, resistance R 1, R3 should adopt the electrical specification resistance consistent with parameter, and resistance R 2, R4 also should adopt the electrical specification resistance consistent with parameter.The described resistance that respectively gathers of mode three should adopt precision resistance to be used as exchanging acquisition elements.
Above-mentioned three kinds of modes exemplify is interchange pick-up transducers element mode of connection in single-phase situation, and for three-phase four-line system, its mode of connection principle is same as described above, and difference only is to have increased respectively two current acquisition elements and two voltage acquisition elements.
The utility model has two kinds of assembly models by the installation site of topworks's (being low-voltage circuit breaker) of emergency protection action:
Mode one: low-voltage circuit breaker is built-in.As shown in Figure 7, install low-voltage circuit breaker with electrical apparatus release and auxiliary contact additional in intelligent electric energy meter inside.The quantity of state acquisition interface input terminal 25 of the auxiliary contact 71 access intelligent electric energy meter nucleus modules of isolating switch is used for deciliter position of monitoring breaker, and the tripping operation output interface terminal 26 of the shunt opening trip coil 72 access intelligent electric energy meter nucleus modules of isolating switch is realized emergency protection tripping operation control.Whether the tripping operation output interface also comprises protection control switch and tripping relay, on the output control loop of protection control switch and tripping relay serial connection tripping operation output interface, come into operation at the emergency protection trip avoidance function that is used for the setting intelligent electric energy meter.
Mode two: low-voltage circuit breaker external.As shown in Figure 8, the low-voltage circuit breaker installation site is moved on to the intelligent electric energy meter outside, intelligent electric energy meter is identical with mode of connection and Fig. 7 between low-voltage circuit breaker, with electric major loop, control signal loop, state detection signal return wire one by one correspondence be connected.
What mode one, mode two exemplified is that function described in the utility model is at the mode of connection of the different installation sites of protection topworks of single-phase intelligent electric energy meter; for three-phase intelligent electric-energy meter; its connection principle is constant, but needs to select the three-phase low-voltage isolating switch as emergency protection topworks.Be conserve space and cost, can select only to cut-off the low-voltage circuit breaker of phase line type, have identical effect yet, but in the situation that electric energy meter zero line and phase line wiring error just do not have earth leakage protective effect.The tripping operation output interface of such scheme all comprises a tripping relay, is used for being switched on or switched off the control power supply of isolating switch shunt opening trip coil, plays the effect of controlling breaker open operation.The shunt opening trip coil of isolating switch is controlled power supply, can adopt the Type Control power supplys such as alternating current 220V, direct current 24V, interchange or the DC power supply that also can export by the power module of intelligent electric energy meter both can have been adopted by the direct mode of power supply of electric major loop (being phase line) after the voltage stabilizing rectification.It is simple in structure that employing directly provides by electric major loop the advantage of controlling the Power supply mode, production results is low, but it is relatively poor to control power quality, emergency protection action accuracy can reduce, be to improve protection action accuracy, the shunt release of wide operating voltage range can be considered to adopt in the type selecting aspect of breaker shunt release annex; Employing is that fault protection action accuracy is high by the advantage of the mode of the power module power supply of intelligent electric energy meter, and can reduce the failure rate of breaker shunt release annex, improves the reliability of electricity protection.
The advantage of mode one is to install simply; if intelligent electric energy meter and higher level's communication mode are the power carrier modes; method and the common electric energy meter of its access electrical network are in full accord, only phase line, the zero line of low-voltage circuit line need be accessed respectively respective terminal and can realize described fault remote monitoring defencive function.Its shortcoming is that the low-voltage circuit breaker repair and replacement are inconvenient.The advantage of mode two is that the low-voltage circuit breaker repair and replacement are more convenient.Shortcoming is that installation and connection is slightly aobvious complicated, and control signal wire, state detection signal line all need to receive the low-voltage circuit breaker respective terminal from the intelligent electric energy meter terminal, need to consider to prevent the problem that connecting line is destroyed.
Although specifically show and introduced the utility model in conjunction with preferred embodiment; but the those skilled in the art should be understood that; within not breaking away from the spirit and scope of the present utility model that appended claims limits; in the form and details the utility model is made a variety of changes, be protection domain of the present utility model.
Claims (5)
1. intelligent electric energy meter with electricity consumption malfunction monitoring defencive function, comprise computation chip, the leakage current sample circuit, phase current sampling circuit, the phase voltage sample circuit, central processor CPU, low-voltage circuit breaker, described leakage current sample circuit electrically connects described computation chip, described computation chip and central processor CPU electrically connect mutually, described central processor CPU electrically connects described low-voltage circuit breaker through a tripping operation output interface, described low-voltage circuit breaker electrically connects described central processor CPU through a state acquisition interface, it is characterized in that, also comprise power module.
2. a kind of intelligent electric energy meter with electricity consumption malfunction monitoring defencive function according to claim 1, is characterized in that, described power module comprises rechargeable battery.
3. a kind of intelligent electric energy meter with electricity consumption malfunction monitoring defencive function according to claim 1, it is characterized in that, described low-voltage circuit breaker comprises shunt release and auxiliary contact, and described tripping operation output interface electrically connects shunt release, and described auxiliary contact electrically connects the state acquisition interface; Also comprise protection control switch and tripping relay, described protection control switch and tripping relay are serially connected on the output control loop of output interface.
4. the described a kind of intelligent electric energy meter with electricity consumption malfunction monitoring defencive function of according to claim 1-3 any one, it is characterized in that, also comprise keyboard, display screen, audible-visual annunciator, described keyboard electrically connects described central processor CPU, and described central processor CPU electrically connects respectively described display screen, audible-visual annunciator; Described display screen be used for to show the protection dependent event information of electric weight, the electricity charge, power, table meter fault and overcurrent, short circuit, overvoltage, under-voltage, decompression, electric leakage, anti-power transmission fault; Described audible-visual annunciator is used for prompting electric energy meter operating condition, communications status, electric energy meter abnormality, relevant emergency protection information; Described central processor CPU electrically connects mutually with a clock module respectively, mutually electrically connects with a data-carrier store.
5. the described a kind of intelligent electric energy meter with electricity consumption malfunction monitoring defencive function of according to claim 1-3 any one; it is characterized in that; described intelligent electric energy meter and long-range main station system or remote administration terminal are carried out two-way communication by data communication protocol, and accept the management of long-range main station system or remote administration terminal.
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| CN109917718A (en) * | 2019-04-02 | 2019-06-21 | 上海理工大学 | It is a kind of for remotely monitoring the System and method for of single-phase household electrical appliance |
| CN110363922A (en) * | 2019-08-12 | 2019-10-22 | 国网冀北电力有限公司承德供电公司 | A kind of charging trip system and method |
| CN111505562A (en) * | 2020-04-29 | 2020-08-07 | 内蒙古电力(集团)有限责任公司 | Test system for metering performance self-monitoring capability of electric energy meter |
| CN111505562B (en) * | 2020-04-29 | 2023-03-17 | 内蒙古电力(集团)有限责任公司 | Test system for metering performance self-monitoring capability of electric energy meter |
| CN113189481A (en) * | 2021-05-21 | 2021-07-30 | 江苏大学 | Electric power instrument with circuit breaker service life monitoring function and monitoring method |
| CN113189481B (en) * | 2021-05-21 | 2022-09-02 | 南京慧众信息科技有限公司 | Electric power instrument with circuit breaker service life monitoring function and monitoring method |
| CN113285422A (en) * | 2021-07-22 | 2021-08-20 | 山东舍拜恩环保科技有限公司 | Power utilization protection device and method |
| CN113884806A (en) * | 2021-09-18 | 2022-01-04 | 陕西能源研究院有限公司 | Distribution network automation electric energy acquisition module |
| CN114113915A (en) * | 2021-12-09 | 2022-03-01 | 广东电网有限责任公司 | Low-voltage transformer area electric leakage detection method, system, equipment and storage medium |
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