CN204631126U - A kind of energy measuring device with easy installed current transformer - Google Patents
A kind of energy measuring device with easy installed current transformer Download PDFInfo
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- CN204631126U CN204631126U CN201520208755.0U CN201520208755U CN204631126U CN 204631126 U CN204631126 U CN 204631126U CN 201520208755 U CN201520208755 U CN 201520208755U CN 204631126 U CN204631126 U CN 204631126U
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Abstract
The utility model discloses a kind of energy measuring device with easy installed current transformer, described energy measuring device has housing and internal circuit, and described housing adopts flame-retardant insulating material to make, described internal circuit has sampling module, metering module, microprocessor module, display module, indicating module, tripping operation power-off modular, ESAM module, multi tariff metering module, communication module, energy-storage module; The installation procedure of current transformer that adopted easy installed current transformer effectively simple and easy, saves installing component.
Description
Technical field
The utility model relates to a kind of energy measuring device, particularly relates to a kind of energy measuring device with easy installed current transformer.
Background technology
Intelligent electric meter is the general requirement of building according to national grid, a kind of electric energy meter that the basis of national grid intelligent electric meter series standard is researched and developed, intelligent electric energy meter has electrical energy metering, information storage, information processing, Real-Time Monitoring, the automatically function such as control and information interaction, can effectively stop arrearage behavior, the management of science can be carried out effectively and timely to user power utilization.At present, intelligent electric energy meter is used in dormitory widely in family, school student dormitory, enterprises and institutions.
But, there is a lot of technical matters in existing intelligent electric energy meter, the such as current sample shunt of existing a lot of intelligent electric energy meter comprises two contacts being arranged on its side and connects sampling wire, realizes sample rate current by the sample circuit on described sampling wire and electric energy meter mainboard.There is the magnetic induction line gathered in electric energy meter inside, magnetic flux is there is equally in the region surrounded between two described sampling wires, like this when the sample rate current in wire of sampling changes, the induction current of interference sample electric current accuracy will be formed, and faradic size and described two sample and surround the area positive correlation in region between wire, therefore the region area surrounded between sampling wire is larger, also larger on the accuracy impact of institute's current sample current value.In the set-up mode of existing current sample shunt, two sampling wires are in the same side of current sample shunt, in any case be therefore wound around two sampling wires, all be difficult to reduce the region area that two wires surround, therefore, cause external magnetic field large to the interference of sampled signal, the accuracy that electric energy meter measures can not be ensured; In addition, current transformer of the prior art is all be fixed on connection terminal by U-shaped device, then is enclosed within an insulation shell by U-shaped device summation current transformer, makes the installation of current transformer complicated, and waste material.
Utility model content
The purpose of this utility model is to overcome prior art deficiency, provides a kind of easily installed current transformer, can is directly installed in the middle of two connection terminals, not need to use miscellaneous part.
In order to reach upper object, the technical solution of the utility model is such: provide a kind of energy measuring device with quick-connect terminal, described energy measuring device has housing and internal circuit, described housing adopts flame-retardant insulating material to make, and described internal circuit has sampling module, metering module, microprocessor module, display module, indicating module, tripping operation power-off modular, ESAM module, multi tariff metering module, communication module, energy-storage module, is characterized in that:
Described sampling module has current sample module and voltage sample module, and described current sample module has current sample sensor, for obtaining current sampling data; Described voltage sample module has voltage sample sensor, for obtaining voltage sample value; Described current sample sensor adopts easy installed current transformer, for cylindrical, the lead-in wire of two certain lengths is drawn at its any point, the length of naked core is 3 ± 0.5mm, two planar side of described easy installed current transformer are provided with symmetrical round-meshed copper sheet, current transformer directly can be installed in the middle of two connection terminals by described circular hole.
Described metering module is used for that the signal coming from described sampling module is converted into metering signal and delivers to described microprocessor module;
Described microprocessor module is used for realizing data processing work; The result of data processing is kept in data-storing module by described microprocessor module; Described microprocessor module has also at least been used to safety certification, Communication Control, display and control, and breaker tripping and closing control, the data processing work of measure control;
Described display module is LCD display module; Described display module has plurality of display modes;
Described indicating module is LED indicating module; Described LED indicating module is arranged at below described LCD display module; Described LED indicating module has 2 long-life LED light emitting diodes, is used to indicate running status; Described 2 long-life LED light emitting diodes are respectively pulse pilot lamp and tripping operation pilot lamp; Described pulse pilot lamp extinguishes when not working, and glimmers during metering electric energy; Described tripping operation pilot lamp is lighted when on-load switch disjunction, extinguishes when not working;
The permission that described tripping operation power-off modular is used for user power utilization state connects/interrupts connection control;
Described ESAM module is used for realizing safety certification, and described ESAM module adopts the close algorithm of state, in order to guarantee to arrange state checking meter, take and controls functional status, data transmission security during remote mode state;
Described multi tariff metering module, has multiple rate metered scheme, for realizing rate metering;
Described communication module has RS485 communication module, infrared communication module, carrier communication module;
Described energy-storage module is used for providing electric energy;
The beneficial effects of the utility model are: overcome the deficiencies in the prior art, the installation procedure effectively having realized current transformer simple and easy and save installing component.
Accompanying drawing explanation
The outboard profile of the easy installation current transformer that Fig. 1 adopts for energy measuring device of the present utility model;
The planimetric map of the easy installed current transformer that Fig. 2 adopts for energy measuring device of the present utility model;
Be labeled as in figure: 1-cylindrical current mutual inductor, 2-circular hole.
Embodiment
Below in conjunction with the drawings and specific embodiments, the utility model is described in further detail:
As shown in Figure 1, 2, the outboard profile of easy installation current transformer that adopts for energy measuring device of the present utility model of Fig. 1; The planimetric map of the easy installed current transformer that Fig. 2 adopts for energy measuring device of the present utility model;
Described energy measuring device has housing and internal circuit, and described housing adopts flame-retardant insulating material to make, and described internal circuit has sampling module, metering module, microprocessor module, display module, indicating module, tripping operation power-off modular, ESAM module, multi tariff metering module, communication module, energy-storage module, is characterized in that:
Described sampling module has current sample module and voltage sample module, and described current sample module has current sample sensor, for obtaining current sampling data; Described voltage sample module has voltage sample sensor, for obtaining voltage sample value;
Described current sample sensor adopts easy installed current transformer, for cylindrical, the lead-in wire of two certain lengths is drawn at its any point, the length of naked core is 3 ± 0.5mm, two planar side of described easy installed current transformer are provided with symmetrical round-meshed copper sheet, current transformer directly can be installed in the middle of two connection terminals by described circular hole.
Described metering module is used for that the signal coming from described sampling module is converted into metering signal and delivers to described microprocessor module;
Described microprocessor module is used for realizing data processing work; The result of data processing is kept in data-storing module by described microprocessor module; Described microprocessor module has also at least been used to safety certification, Communication Control, display and control, and breaker tripping and closing control, the data processing work of measure control;
Described display module is LCD display module; Described display module has plurality of display modes;
Described indicating module is LED indicating module; Described LED indicating module is arranged at below described LCD display module; Described LED indicating module has 2 long-life LED light emitting diodes, is used to indicate running status; Described 2 long-life LED light emitting diodes are respectively pulse pilot lamp and tripping operation pilot lamp; Described pulse pilot lamp extinguishes when not working, and glimmers during metering electric energy; Described tripping operation pilot lamp is lighted when on-load switch disjunction, extinguishes when not working;
The permission that described tripping operation power-off modular is used for user power utilization state connects/interrupts connection control;
Described ESAM module is used for realizing safety certification, and described ESAM module adopts the close algorithm of state, in order to guarantee to arrange state checking meter, take and controls functional status, data transmission security during remote mode state;
Described multi tariff metering module, has multiple rate metered scheme, for realizing rate metering; Described communication module has RS485 communication module, infrared communication module, carrier communication module; Described energy-storage module is used for providing electric energy;
Described metering signal is pulse signal or described metering signal is digital signal.Described plurality of display modes comprises automatic cycle display mode, button display mode and power failure display mode.Described pulse pilot lamp is red.Described tripping operation pilot lamp is yellow.Described energy-storage module is battery, or described energy-storage module is ultracapacitor.Described carrier communication module is configured to the carrier communication of low-voltage power line.Described carrier communication module adopts micropower communication.
Intelligent electric energy meter have employed ultra-large digital signal processing chip, the memory of persistence information, full isolation standard RS485 communication interface and infrared communication, configurable low voltage power line carrier communication module.The advanced technologies such as the wide temperature liquid crystal display of large picture and information security encryption ESAM module.Electric energy meter have employed advanced SMT surface mount process, and shell adopts high strength, Flame-retardant environment-friendlymaterial material, modern design, beautiful and applicable, has higher dielectric strength and corrosion resistance.This table integrates numerous function, there is electrical energy metering, information stores and the function such as process, Real-Time Monitoring, automatically control, information interaction, can effectively stop arrearage behavior, thus comply with power department effectively carries out modernization scientific management in time requirement to user.
During intelligent electric meter work, voltage, electric current are converted to sampled signal by sending into computation chip after filtering process through senser element, energy signal is converted into pulse signal and delivers to CPU and carry out electric pulse collection by computation chip, electric quantity accumulation and every computational analysis process, its result is kept in data-storing; Simultaneously CPU completes the function treatment such as safety certification, infrared, RS485 communication, carrier communication (micro power radio communication), LCD display, breaker tripping and closing.Ammeter adopts with temperature-compensation circuit clock chip, data security adopts Redundancy Design, data acquisition multiple duplication, guarantees that continuous data is reliable.
Voltage circuit applies 380V alternating voltage 1 hour, and electric energy meter still can normally work without damage.
Ammeter applies short-time overload electric current 30Imax, and electric energy meter still can normally work without damage.Application time is the half period of rated frequency.
Frequency: standard reference frequency 50Hz, runs under being suitable for mains frequency 45Hz ~ 65Hz situation.
Clock: adopt the hardware clock circuit with temperature compensation function, there is calendar, timing, leap year auto-conversion function; Internal clocking terminal output frequency is 1Hz.In-25 ~+60 DEG C of temperature ranges, clock accuracy≤± ls/d; Under reference temperature (23 DEG C), clock accuracy≤± 0.5s/d.
Start: meritorious 1 grade≤0.004Ib (directly accessing).
Meritorious 2 grades≤0.005Ib (directly accessing).
The pilot lamp flicker that electric energy meter has pulse output and electric energy to export.
Shunt running: voltage circuit adds 115%Un, when current return no current, no more than 1 of the pulse of output, has the anti-shunt running function of logic.
Temperature humidity range:
Power consumption: under reference voltage, reference temperature and reference frequency, active power and the applied power consumption of electric energy meter voltage circuit are not more than 1.5W, 10VA under non-communicating state; Be not more than 3W, 12VA in a communication state.
Electricity LCD shows: 0 ~ 999999.99kWh.
Adopting long-life environmental protection lithium battery, battery capacity >=1.2Ah, without the need to changing in electric energy meter life cycle, accumulative more than 5 years of internal clocking correct working time after power-off, can be maintained.When cell voltage is not enough, electric energy meter energy automatic-prompting, warning.
The functions such as intelligent electric meter has function of measuring, and electricity freezes, clearing.
Function of measuring, electric quantity metering (1) has forward and reverse active energy function of measuring, can store its data, and it is meritorious to arrange combination accordingly; (2) there is time-sharing measurement function, active energy by the corresponding period respectively accumulative, store total, point, peak, put down, paddy electric flux; (3) total electric energy of upper 12 months and each rate electric flux can be stored; Data store the boundary moment when being the end of month 24, or monthly No. 1 to the integral point moment in No. 28.
Electricity freezes, and electricity freezes to freeze forward (oppositely) meritorious and point, peak, flat, paddy electricity, is specifically divided into following several situation: (1) regularly freezes: electric energy data is freezed at the time that ammeter is arranged according to user and interval; Each amount of freezing preserves 60 times; (2) instantaneously to freeze: under abnormal condition, freeze the data of current calendar, time, all electric fluxs and active power; The instantaneous amount of freezing preserves the data of last 3 times; (3) agreement is freezed: the old and new two overlap the conversion of rate/period or Utilities Electric Co. think have special requirement time, freeze electric flux and other significant datas of switch instant, preserve last 2 freezing data; (4) day freezes: the electric flux storing moment zero point every day, stores the data of 62 days; (5) integral point freezes: store meritorious total electric energy in integral point moment or least bit moment and idle total electricity and freeze-off time, can store 96 data.The Data Identification of frozen contents and correspondence all meets DL/T 645-2007 and documentation requirements of putting on record thereof, freezes electricity and is ferreted out by other communication interface, is convenient to carry out analysis of electric power consumption and line loss statistics.
Reset, electric energy meter only when authorized and by carrying out electricity clear operation when safety verification, removes the data such as electric flux, the amount of freezing, logout of ammeter storage inside.Electric energy data when permanent recording electric energy meter resets the generation moment of event and resets.
Rate and period and electricity price scheme:
Ammeter adopts hardware band temperature self-compensation Clock Design, has calendar, timing and leap year auto-conversion function.
Calendar, clock and tariff period and electricity price scheme are all undertaken arranging and adjusting by RS485, infrared data interface etc.
There are two cover time-pieces, can arrange " two cover time-piece switching time ", automatically switch to another set of time-piece in the moment of agreement.Often overlap the most multipotency of time-piece and 14 time zones are set; Each time zone table number of optional period day is 1 ~ 8 (during actual motion, specifically belonging to " during first set day segment table " or " during the second cover day segment table " determined by " during two cover days segment table switching time " and the moment at that time of ammeter).
Segment table when having for two cover days, can arrange " during two cover days segment table switching time ", the segment table when the moment of arranging automatically switches another set of day.Segment table when segment table can arrange at most for 8 day when often overlapping day, within a consecutive days (namely each day time segment table) able to programme 4 kinds of rates, maximum 14 periods are set, the period minimum interval of setting is 15 minutes, and the period can cross over reset.
Take control function:
Intelligent electric meter take control function, remote mode is realized by carrier communication system.To the action need of electric energy meter by safety certifications such as strict ESAM modules, the cryptographic algorithm of this ESAM module adopts the close algorithm of state, guarantees that data transmission security is reliable.
When ensureing safety, through safety certifications such as strict ESAM modules, by carrier communication channel, the power consumption parameter in electric energy meter is checked meter setting, intelligent electric meter take control function, remote mode is realized by carrier communication system.
Electric parameter measurement and monitoring:
Intelligent electric meter can be measured, record, show the operational factors such as current voltage, electric current (comprising neutral line current), active power, power factor.Within measuring error (fiducial error) ± 1%.
Logout:
The event recording function of electricity can record the programming of ammeter and clear operation and ammeter running status, is specifically divided into following several situation:
Electric energy data when permanent recording electric energy meter resets the generation moment of event and resets.
Record programming total degree, nearest 10 times programming moment, operator's code, programming item Data Identification.
Total degree (when not comprising broadcast school) during record school, moment during nearest 10 schools, operator's code.
The total degree of record power down, there is the moment of Ji Jie Bouquet in nearest 10 power down.
Record nearest 10 Long-distance Control to operate a switch and nearest 10 Long-distance Control combined floodgate events, record draw, the data such as event generation time and electric flux of closing a floodgate.
Record game clock lid total degree, the generation of nearest 10 game clock lid events, finish time.Logout is ferreted out by communication interface, in carrying out statistical study.
Recording power anomalous event total degree, the nearest electric energy data that moment, finish time and correspondence occur for 10 times.
Record built-in on-load switch misoperation event times, the nearest electric energy data that moment, finish time and correspondence occur for 10 times.
Clocking capability:
Adopt the hardware clock circuit with temperature compensation function, there is calendar, timing, leap year auto-conversion function; Internal clocking terminal output frequency is 1Hz.During electric energy meter acceptable broadcast school, scope is not more than 5min.
Presentation Function:
Display: this electric energy meter adopts the liquid crystal display of giant-screen wide temperature Chinese character, and have anti-ultraviolet function, under normal usage, the LCD life-span is greater than 10 years.
Electric energy meter possesses automatic cycle and button two kinds of display modes; Automatic cycle displaying time interval can be arranged in 5 ~ 20 seconds; During button display, LCD should start backlight, automatically closes backlight time charged without after operation 60s.
Have a power failure display: after (1) has a power failure, liquid crystal display is closed automatically; (2), after liquid crystal display is closed, keys available or other modes wake liquid crystal display up; As without operation after waking up, after automatic cycle shows one time, close display; Button display operation end closed display after 30 seconds.
Communication function:
Have an infrared communication interface and a RS485 communication interface and a carrier communication interface, communication interface Physical layer is independent of one another, and a kind of damage of communication channel does not affect other channel.
Electric energy meter can carry out data transmission with handheld terminal, data acquisition unit, checkout equipment, computing machine etc. by communication interface, arrange when to broadcast pair, copy reading, programming, management etc.Communication protocol meets DL/T645-2007 standard.
RS485 communication interface and electric energy meter internal circuit realize electrical isolation, have fail-safe circuit.
The default baud rate of modulation system infrared communication interface is 1200bps.
RS485 communications speed allows to select in 1200bps, 2400bps, 4800bps, 9600bps, and default setting is 2400bps.RS485 communication interface and electric energy meter internal circuit realize electrical isolation, have fail-safe circuit.Communication interface, by electric property, anti-interference test, meets the requirement of DL/T 614-2007.
Port exports:
Electric energy meter possesses the optical pulse test output that is directly proportional to counted electric energy and electric pulse tests output function.The requirement of characteristic conforms GB/T17215.211-2006 of optical pulse test output unit.Electric pulse test exports as light isolation passive exports, and pulsewidth is 80ms ± 20ms, the requirement of the characteristic symbol GB/T15284-2002 of output unit.Electric energy meter possesses a second time signal lead-out terminal.
Warning function:
Light is reported to the police and is adopted backlight lightening mode to carry out light warning, recovers warning normally automatically terminate when event.Alert event comprises: overload, power is (except magic list), battery undervoltage etc. oppositely.
Programming password and safeguard protection:
By solid state medium or virtual medium, optimum configurations is carried out to electric energy meter, the electricity charge that prestore, information is when returning and write and issue remote control command operation, need by the safety certification of ESAM module, to guarantee that data transmission security is reliable.The cryptographic algorithm of ESAM module meets the relevant policies of national Password Management, uses SM1 algorithm.
On-load switch:
On-load switch can adopt internal or external mode, and when adopting built-in on-load switch, electric energy meter maximum current is no more than 60A, and on-load switch technical requirement meets IEC62055-31:2005, on-load switch type selecting Uc2.
When adopting built-in on-load switch, have extinguishing arc measure during switching manipulation, its outlet loop has false action-proof and is convenient to the safety practice of on-the-spot test.Electric energy meter is in the operating voltage range of expansion, and on-load switch should be able to normally work.
Adopt the external electric energy meter meeting switch that one of following two kinds of modes can be taked to realize the control of external on-load switch: (1) exports a pair passive nonpolarity gauge tap signal from electric energy meter tripping operation control terminal 5 and 6, and switching node capacity is for exchanging 250V, 2A.The non-actuated state of switching node is closed, and excited state is off.When gauge tap is in non-actuated state, external on-load switch closes, and allows user power utilization; When gauge tap is in excited state, external on-load switch disconnects, and interrupts customer power supply; (2) directly export an AC voltage control signal from electric energy meter tripping operation control terminal 5, this control signal draws the phase line from this electric energy meter supply line, and driving force should be not less than 20mA.The non-actuated state output voltage of control signal is 90% ~ 100% of supply voltage, and excited state output voltage is 0% ~ 25% of supply voltage.When control signal is in non-actuated state, external on-load switch closes, and allows user power utilization; When control signal is in non-actuated state, external on-load switch disconnects, and interrupts customer power supply.This output loop possesses long term overloading and short-circuit protection ability.
No matter built-in on-load switch is, external, user's power purchase success after, can by main website by long-range transmission directly close a floodgate order or allow close a floodgate order.Electric energy meter is in "on" position, is closed a floodgate by user oneself by local mode.
Module communication function:
Single-phase electric energy meter possesses the exchange of carrier communication module and micropower wireless communication module, and after module replacing, the metering performance of electric energy meter, the continuous data of storage and parameter should not be affected and change;
The configurable arrowband of electric energy meter or bandwidth carrier module, DL/T 645-2007 agreement and file of putting on record thereof are followed in the communication between electric energy meter and carrier communication module, and interface communication speed default value is 2400bps.As adopted the electric energy meter of external plug and play type carrier communication module, carrier communication interface should have fail-safe circuit, namely when not accessing, accessing or change communication module, should not impact the performance of electric energy meter self, operational factor and normal metering.When carrier communication, the metering performance of electric energy meter, the continuous data of storage and parameter should not be affected and change.Electric energy meter powers in 5s can carry out carrier communication.
DL/T645-2007 agreement and file of putting on record thereof are followed in communication between electric energy meter and carrier wave micropower communication module.Interface communication speed default value is 2400bps.As adopted the electric energy meter of external plug and play type micropower communication module; micropower communication interface should have fail-safe circuit; namely, when not accessing, accessing or change communication module, should not impact the performance of electric energy meter self, operational factor and normal metering.When micropower communicates, the metering performance of electric energy meter, the continuous data of storage and parameter should not be affected and change.
Status indicator lamp, is provided with 2 superbrights, long-life LED light emitting diode altogether, is used to refer to the various running statuses of electric energy meter, is defined as follows respectively below LCD display:
(1) pulse pilot lamp: red, goes out at ordinary times, glimmers during metering active energy.
(2) trip pilot lamp: yellow, bright during on-load switch disjunction, goes out at ordinary times.
Above content is only better embodiment of the present utility model, for those of ordinary skill in the art, according to thought of the present utility model, all will change in specific embodiments and applications, this description should not be construed as restriction of the present utility model.
Claims (1)
1. have an energy measuring device for easy installed current transformer, described energy measuring device has housing and internal circuit, and described housing adopts flame-retardant insulating material to make, described internal circuit has sampling module, metering module, microprocessor module, display module, indicating module, tripping operation power-off modular, ESAM module, multi tariff metering module, communication module, energy-storage module, is characterized in that:
Described sampling module has current sample module and voltage sample module, and described current sample module has current sample sensor, for obtaining current sampling data; Described voltage sample module has voltage sample sensor, for obtaining voltage sample value;
Described current sample sensor adopts easy installed current transformer, for cylindrical, the lead-in wire of two certain lengths is drawn at its any point, the length of naked core is 3 ± 0.5mm, two planar side of described easy installed current transformer are provided with symmetrical round-meshed copper sheet, current transformer directly can be installed in the middle of two connection terminals by described circular hole;
Described metering module is used for that the signal coming from described sampling module is converted into metering signal and delivers to described microprocessor module;
Described microprocessor module is used for realizing data processing work; The result of data processing is kept in data-storing module by described microprocessor module; Described microprocessor module has also at least been used to safety certification, Communication Control, display and control, and breaker tripping and closing control, the data processing work of measure control;
Described display module is LCD display module; Described display module has plurality of display modes;
Described indicating module is LED indicating module; Described LED indicating module is arranged at below described LCD display module; Described LED indicating module has 2 long-life LED light emitting diodes, is used to indicate running status; Described 2 long-life LED light emitting diodes are respectively pulse pilot lamp and tripping operation pilot lamp; Described pulse pilot lamp extinguishes when not working, and glimmers during metering electric energy; Described tripping operation pilot lamp is lighted when on-load switch disjunction, extinguishes when not working;
The permission that described tripping operation power-off modular is used for user power utilization state connects/interrupts connection control;
Described ESAM module is used for realizing safety certification, and described ESAM module adopts the close algorithm of state, in order to guarantee to arrange state checking meter, take and controls functional status, data transmission security during remote mode state;
Described multi tariff metering module, has multiple rate metered scheme, for realizing rate metering;
Described communication module has RS485 communication module, infrared communication module, carrier communication module; Described energy-storage module is used for providing electric energy.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520208755.0U CN204631126U (en) | 2015-04-08 | 2015-04-08 | A kind of energy measuring device with easy installed current transformer |
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| CN201520208755.0U CN204631126U (en) | 2015-04-08 | 2015-04-08 | A kind of energy measuring device with easy installed current transformer |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107884635A (en) * | 2017-09-21 | 2018-04-06 | 北京机械设备研究所 | A kind of Current Mutual Inductance wireless timer and clocking method |
| CN108646069A (en) * | 2018-04-26 | 2018-10-12 | 李秀才 | 6 ~ 630A direct-type intelligent electric meters |
-
2015
- 2015-04-08 CN CN201520208755.0U patent/CN204631126U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107884635A (en) * | 2017-09-21 | 2018-04-06 | 北京机械设备研究所 | A kind of Current Mutual Inductance wireless timer and clocking method |
| CN108646069A (en) * | 2018-04-26 | 2018-10-12 | 李秀才 | 6 ~ 630A direct-type intelligent electric meters |
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Granted publication date: 20150909 Termination date: 20180408 |