CN204154810U - A kind of electric energy meter measuring residual current - Google Patents
A kind of electric energy meter measuring residual current Download PDFInfo
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- CN204154810U CN204154810U CN201420657605.3U CN201420657605U CN204154810U CN 204154810 U CN204154810 U CN 204154810U CN 201420657605 U CN201420657605 U CN 201420657605U CN 204154810 U CN204154810 U CN 204154810U
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- 238000004891 communication Methods 0.000 claims abstract description 95
- 238000012545 processing Methods 0.000 claims abstract description 51
- 238000005070 sampling Methods 0.000 claims abstract description 35
- 230000005611 electricity Effects 0.000 claims description 11
- 230000011664 signaling Effects 0.000 claims description 9
- HPDFFVBPXCTEDN-UHFFFAOYSA-N copper manganese Chemical compound [Mn].[Cu] HPDFFVBPXCTEDN-UHFFFAOYSA-N 0.000 claims description 3
- 230000003993 interaction Effects 0.000 claims description 2
- 230000007935 neutral effect Effects 0.000 abstract description 7
- 238000005259 measurement Methods 0.000 abstract description 6
- 238000006243 chemical reaction Methods 0.000 abstract description 2
- 238000012544 monitoring process Methods 0.000 description 12
- 238000000034 method Methods 0.000 description 3
- 238000001514 detection method Methods 0.000 description 2
- 230000003321 amplification Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000003211 malignant effect Effects 0.000 description 1
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Abstract
本实用新型提供一种可测量剩余电流的电能表，包括壳体、接线端子座、相线、零线、继电器、相线电流采样电阻、剩余电流互感器和电路装置；继电器、相线电流采样电阻和剩余电流互感器均设置在壳体内；相线和零线穿过剩余电流互感器；电路装置包括电压采样模块、信号处理模块、A/D转换模块、电能计量模块、单片机处理模块、继电器控制模块、通信模块、LCD显示模块、按键模块和电源模块。本实用新型可实现对用户线路中的剩余电流进行实时测量、记录，并具有剩余电流超限报警事件和事件记录功能；本实用新型只需在现有的智能电表上进行改进，改进成本不高，且不影响现有电能表的功能和外形尺寸，便于大面积推广。
The utility model provides an electric energy meter capable of measuring residual current, which comprises a shell, a terminal block, a phase wire, a neutral wire, a relay, a phase wire current sampling resistor, a residual current transformer and a circuit device; a relay, a phase wire current sampling Both the resistance and the residual current transformer are set in the casing; the phase line and the neutral line pass through the residual current transformer; the circuit device includes a voltage sampling module, a signal processing module, an A/D conversion module, an electric energy measurement module, a single-chip processing module, and a relay Control module, communication module, LCD display module, key module and power supply module. The utility model can realize real-time measurement and recording of the residual current in the user line, and has the function of alarm event and event recording of the excess current of the residual current; the utility model only needs to improve the existing smart meter, and the improvement cost is not high , and does not affect the functions and dimensions of the existing electric energy meters, which is convenient for large-scale promotion.
Description
Technical field
The utility model relates to intelligent electric energy meter, is specifically related to a kind of electric energy meter measuring residual current.
Background technology
Residual current refers to the electric current that in distribution line, each phase current vector is non-vanishing, is in most cases to be caused by the electric leakage of equipment or circuit, can burn electrical equipment or circuit, cause fire when leaking electricity serious.Therefore in low voltage electric network, carrying out residual current detection and installing RCD is the effective safeguard procedures of one preventing person electric shock, electrical fire and electrical equipment from damaging.Countries in the world and International Electrotechnical Commission vigorously promote the use RCD by the corresponding electrical install code of formulation and electricity consumption code in low voltage electric network.But residual current operated protective device can only carry out trip protection when residual current transfinites fault, early warning and Real-Time Monitoring cannot be carried out.
Although present electric energy meter can carry out phase line current, neutral line current is measured, all there is no the measurement function of residual current.Application number is 200420018274.5, name is called the Chinese patent literature of " single phase electronic type electricity leakage detection intelligent electric power meter ", it discloses a kind of electric energy meter that can carry out detecting to leakage current identification, but this electric energy meter cannot be measured in real time to leakage current value, and record cannot be carried out to the leakage current in subscriber's line.
Utility model content
The purpose of this utility model is: for solving the real-time measurement problem of residual current in subscriber's line, the utility model provides a kind of can be measured in real time to the residual current of user side, the electric energy meter of early warning and warning function, and have save cost, easy for installation, can the advantage such as spread.
The technical solution of the utility model is: the electric energy meter measuring residual current of the present utility model, comprises housing, terminal block, phase line, zero line; Above-mentioned terminal block comprises the first connection terminal, the second connection terminal, the 3rd connection terminal and the 4th connection terminal; Terminal block is fixedly mounted on housing; Phase line and zero line are arranged in housing; One end of zero line is electrically connected with the 3rd connection terminal; The other end of zero line is electrically connected with the 4th connection terminal; Its design feature is: also comprise relay, phase line current sampling resistor, residual current transformer and circuit arrangement;
Above-mentioned relay, phase line current sampling resistor and residual current transformer are all arranged in housing;
One end of phase line current sampling resistor is electrically connected with the first connection terminal; The other end of phase line current sampling resistor is electrically connected with relay; One end of phase line is electrically connected with the second connection terminal; The other end of phase line is electrically connected with relay; Residual current transformer is arranged at phase line with zero line mutually near place, and phase line and zero line are through residual current transformer;
Above-mentioned circuit arrangement comprises voltage sample module, signal processing module, A/D modular converter, electric energy metering module, single chip processing module, relay control module, communication module, LCD display module, key-press module and power module;
The voltage sample module of circuit arrangement, signal processing module, A/D modular converter, electric energy metering module, single chip processing module, relay control module, communication module and power module are arranged in housing;
Voltage sample module is provided with signal output part; Signal processing module is provided with voltage sampling signal input end, phase line current sampled signal input end, residual current signal input part and signal output part; A/D modular converter is provided with signal input part, the first signal output part and secondary signal output terminal; Electric energy metering module is provided with signal input part and signal output part; Single chip processing module is provided with sampled signal input end, power consumption signal input end, relay control signal output terminal, communication ends, display output terminal and push button signalling input end; Relay control module is provided with signal input part and control signal output terminal; Communication module is provided with internal communication ends and correspondence with foreign country end; LCD display module is provided with signal input part; Key-press module is provided with signal output part;
The voltage sampling signal input end of signal processing module, phase line current sampled signal input end and residual current signal input part are respectively with signal output part, the phase line current sampling resistor of voltage sample module with residual current transformer is corresponding is electrically connected; The signal input part of A/D modular converter is electrically connected with the signal output part of signal processing module; The signal input part of electric energy metering module is electrically connected with the first signal output part signal of A/D modular converter; The sampled signal input end of single chip processing module is electrically connected with the secondary signal output end signal of A/D modular converter; The power consumption signal input end of single chip processing module is electrically connected with electric energy metering module signal output part signal; The signal input part of relay control module is electrically connected with the relay control signal output end signal of single chip processing module; The control signal output terminal of relay control module is electrically connected with the control end of relay; The internal communication ends of communication module is electrically connected with the communication ends two-way signaling of single chip processing module; The signal input part of LCD display module is electrically connected with the display output end signal of single chip processing module; The signal output part of key-press module is electrically connected with the push button signalling input end signal of single chip processing module; Power module provides working power.
The communication module of above-mentioned circuit arrangement comprises infrared communication interface, RS485 communication interface and carrier communication interface; Infrared communication interface, RS485 communication interface and carrier communication interface are respectively equipped with internal communication ends and correspondence with foreign country end; The internal communication ends of infrared communication interface, RS485 communication interface and carrier communication interface forms the internal communication ends of above-mentioned communication module jointly; The correspondence with foreign country end of infrared communication interface, RS485 communication interface and carrier communication interface forms the correspondence with foreign country end of above-mentioned communication module jointly.
The LCD display module of above-mentioned circuit arrangement comprises being arranged on housing to transfinite the LCD display of alarm information for showing power consumption, in real time residual electricity flow valuve and residual current; Key-press module comprises the button being arranged on and housing being consulted information interaction for user.
Further scheme is: above-mentioned relay is the relay that JML82 type magnetic keeps; Residual current transformer is HLTY1 type current transformer; Phase line current sampling resistor is copper-manganese sampling resistor.
The utility model has positive effect: (1) electric energy meter measuring residual current of the present utility model, can realize measuring in real time the residual current in subscriber's line, record, can automatic alarm when the residual current detected exceedes preset alarming threshold value, and form residual current overload alarm logout; All residual current measurement data and record upload to the data acquisition system (DAS) on monitoring backstage by the communication interface such as RS485, carrier wave, carry out statistical study by the residual current event of monitoring backstage to all users, and finally early warning is carried out to the residual current event of user.(2) electric energy meter measuring residual current of the present utility model, existing intelligent electric meter improves, and improving cost is not high, and does not affect function and the physical dimension of existing electric energy meter, is convenient to spread.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model, and figure middle shell eliminates protecgulum and do not draw;
Fig. 2 is circuit structure schematic block diagram of the present utility model.
Reference numeral in above-mentioned accompanying drawing is as follows:
Housing 1,
Terminal block 2, the first connection terminal 21, second connection terminal the 22, three connection terminal the 23, four connection terminal 24,
Relay 3,
Phase line current sampling resistor 4,
Phase line 5,
Zero line 6,
Residual current transformer 7,
Circuit arrangement 8, voltage sample module 81, signal processing module 82, A/D modular converter 83, electric energy metering module 84, single chip processing module 85, relay control module 86, communication module 87, LCD display module 88, key-press module 89, power module 80.
Embodiment
Below in conjunction with the drawings and specific embodiments, the utility model is described in further detail.
(embodiment 1)
See Fig. 1, the electric energy meter of the residual current measured of the present embodiment, housing 1, terminal block 2, relay 3, phase line current sampling resistor 4, phase line 5, zero line 6, residual current transformer 7 and circuit arrangement 8 form.
Terminal block 2 comprises the first connection terminal 21, second connection terminal 22, the 3rd connection terminal 23 and the 4th connection terminal 24, and terminal block 2 is fixedly mounted on housing 1, and is positioned at the lower end of housing 1.
Relay 3 is fixedly installed in housing 1.In the present embodiment, relay 3 preferably adopts JML82 type magnetic latching relay.
Phase line current sampling resistor 4 is arranged in housing 1.Preferably copper-manganese sampling resistor is adopted in phase line current sampling resistor 4 the present embodiment.One end of phase line current sampling resistor 4 is electrically connected with the first connection terminal 21; The other end of phase line current sampling resistor 4 is electrically connected with relay 3.
Phase line 5, zero line 6 and residual current transformer 7 are all arranged in housing 1.
One end of phase line 5 is electrically connected with the second connection terminal 22; The other end of phase line 5 is electrically connected with relay 3.
One end of zero line 6 is electrically connected with the 3rd connection terminal 23; The other end of zero line 6 is electrically connected with the 4th connection terminal 24.Zero line 6 is mutually close with phase line 5 in housing 1, and zero line 6 is bent into square shape with phase line 5 near place, for guaranteeing that residual current transformer 7 can residual current in correct sample user circuit when the normal wiring of ammeter.
Residual current transformer 7 is arranged at phase line 5 with zero line 6 mutually near place, and phase line 5 and zero line 6 are through residual current transformer 7.In the present embodiment, residual current transformer 7 preferably adopts HLTY1 type current transformer.
See Fig. 2, circuit arrangement 8 forms primarily of voltage sample module 81, signal processing module 82, A/D modular converter 83, electric energy metering module 84, single chip processing module 85, relay control module 86, communication module 87, LCD display module 88, key-press module 89 and power module 80.
The voltage sample module 81 of circuit arrangement 8, signal processing module 82, A/D modular converter 83, electric energy metering module 84, single chip processing module 85, relay control module 86, communication module 87 and power module 80 are arranged in housing 1.
Voltage sample module 81 is provided with signal output part; Signal processing module 82 is provided with voltage sampling signal input end, phase line current sampled signal input end, residual current signal input part and signal output part; A/D modular converter 83 is provided with signal input part, the first signal output part and secondary signal output terminal; Electric energy metering module 84 is provided with signal input part and signal output part; Single chip processing module 85 is provided with sampled signal input end, power consumption signal input end, relay control signal output terminal, communication ends, display output terminal and push button signalling input end; Relay control module 86 is provided with signal input part and control signal output terminal; Communication module 87 is provided with internal communication ends and correspondence with foreign country end; LCD display module 88 is provided with signal input part; Key-press module 89 is provided with signal output part.
The voltage sampling signal input end of signal processing module 82, phase line current sampled signal input end and residual current signal input part are respectively with signal output part, the phase line current sampling resistor 4 of voltage sample module 81 with residual current transformer 7 is corresponding is electrically connected; The signal input part of A/D modular converter 83 is electrically connected with the signal output part of signal processing module 82; The signal input part of electric energy metering module 84 is electrically connected with the first signal output part signal of A/D modular converter 83; The sampled signal input end of single chip processing module 85 is electrically connected with the secondary signal output end signal of A/D modular converter 83; The power consumption signal input end of single chip processing module 85 is electrically connected with electric energy metering module 84 signal output part signal; The signal input part of relay control module 86 is electrically connected with the relay control signal output end signal of single chip processing module 85; The control signal output terminal of relay control module 86 is electrically connected with the control end of relay 3; The internal communication ends of communication module 87 is electrically connected with the communication ends two-way signaling of single chip processing module 85; With monitoring background communication when the correspondence with foreign country end of communication module 87 uses; The signal input part of LCD display module 88 is electrically connected with the display output end signal of single chip processing module 85; The signal output part of key-press module 89 is electrically connected with the push button signalling input end signal of single chip processing module 85; Power module 80 provides working power for electric energy meter.
The LCD display module 88 of circuit arrangement 8 comprises the LCD display be arranged on housing 1; Key-press module 89 comprises the button be arranged on housing 1.The display of the warning message when LCD display of LCD display module 88 transfinites for the power consumption and residual current showing user during normal work.Button on key-press module 89 is used for power consumer and consults the mutual of power consumption information etc. and electric energy meter.
In communication module 87 the present embodiment, preferably include infrared communication interface, RS485 communication interface and carrier communication interface.Infrared communication interface, RS485 communication interface and carrier communication interface are respectively equipped with internal communication ends and correspondence with foreign country end; The internal communication ends of infrared communication interface, RS485 communication interface and carrier communication interface forms the internal communication ends of aforesaid communication module 87 jointly; The correspondence with foreign country end of infrared communication interface, RS485 communication interface and carrier communication interface forms the correspondence with foreign country end of aforesaid communication module 87 jointly.The infrared communication interface of communication module 87 is used for the on-the-spot parameters of staff and reads data in table.RS485 communication interface and carrier communication interface are mainly used in the monitoring background communication with power supply department.
The electric energy meter of the residual current measured of the present embodiment, its principle of work and the course of work are summarized as follows:
The electric energy meter of the residual current measured of the present embodiment, when it uses, phase line current loop is made up of phase line current sampling resistor 4, relay 3 and phase line 5; Phase line current flows into from the first connection terminal 21 of terminal block 2, the second connection terminal 22 flows out; Phase line current signal obtains by phase line current sampling resistor 4.
Neutral line current loop is made up of zero line 6, and neutral line current flows into from the 4th connection terminal 24 of terminal block 2, and the 3rd connection terminal 23 flows out.
Residual current signal is obtained by residual current sampling mutual inductor 7.
Line voltage sampling and power consumption are calculated as the prior art of existing electric energy meter.
After the signal processing module 82 that line voltage sampled signal, phase line current sampled signal, residual current sampled signal deliver to circuit arrangement 8 carries out amplification process, convert corresponding digital signal to through A/D modular converter 83, a road send electric energy metering module 84 to carry out real time electrical quantity calculating.The information such as line voltage value, phase line current value, residual electricity flow valuve, mains frequency, power factor (PF), power consumption that single chip processing module 85 real-time reception A/D modular converter 83 and electric energy metering module 84 are uploaded; Single chip processing module 85, by parameters such as phase line current value, residual electricity flow valuve, mains frequency, power factor (PF)s, calculates neutral line current value, judges user's whether normal electricity consumption and whether there is electricity filching behavior for monitoring backstage.The information such as line voltage, phase line current, neutral line current, residual current, power consumption carry out storing by single chip processing module 85 and the LCD display issuing LCD display module 88 shows in real time, be sent to monitoring backstage carry out statistical study for power information acquisition system by the carrier communication interface of communication module 87 or RS485 interface; Simultaneously, real-time residual electricity flow valuve on subscriber's line and preset residual current alarm threshold values compare by single chip processing module 85: if residual electricity flow valuve exceedes preset alarming threshold value in real time, then reported to the police to user by the LCD display of LCD display module 88, and give monitoring backstage by carrier communication interface or RS485 communication interface active reporting; Record is carried out to this residual current overload alarm event simultaneously, carry out statistical query to monitor backstage.Monitoring backstage is by the statistical study to residual current overload alarm event, can transfinite to residual current contingent in subscriber's line circuit and predict, and send information by carrier communication interface or RS485 communication interface to this user electric energy meter, given warning in advance to user by electric energy meter.If desired, monitoring backstage cuts off the power supply of user by the remote controlled relay 3 of circuit arrangement 8, with the generation of the malignant events such as fire-proof.
To sum up, the electric energy meter of the residual current measured of the present embodiment, can realize measuring in real time the residual current in subscriber's line, record, can automatic alarm when the residual current detected exceedes preset alarming threshold value, and form residual current overload alarm logout; All residual current measurement data and record upload to the data acquisition system (DAS) on monitoring backstage by the communication interface such as RS485, carrier wave, carry out statistical study by the residual current event of monitoring backstage to all users, and finally early warning is carried out to the residual current event of user; And its needs improve on existing intelligent electric meter, improving cost is not high, and does not affect function and the physical dimension of existing electric energy meter, is convenient to spread.
Above embodiment is the explanation to embodiment of the present utility model; but not to restriction of the present utility model; person skilled in the relevant technique is not when departing from spirit and scope of the present utility model; can also make various conversion and change and obtain corresponding equivalent technical scheme, therefore all equivalent technical schemes all should be included into scope of patent protection of the present utility model.
Claims (2)
1. an electric energy meter for residual current be can measure, housing (1), terminal block (2), phase line (5), zero line (6) comprised; Described terminal block (2) comprises the first connection terminal (21), the second connection terminal (22), the 3rd connection terminal (23) and the 4th connection terminal (24); Terminal block (2) is fixedly mounted on housing (1); Phase line (5) and zero line (6) are arranged in housing (1); One end of zero line (6) is electrically connected with the 3rd connection terminal (23); The other end of zero line (6) is electrically connected with the 4th connection terminal (24); It is characterized in that: also comprise relay (3), phase line current sampling resistor (4), residual current transformer (7) and circuit arrangement (8);
Described relay (3), phase line current sampling resistor (4) and residual current transformer (7) are all arranged in housing (1);
One end of phase line current sampling resistor (4) is electrically connected with the first connection terminal (21); The other end of phase line current sampling resistor (4) is electrically connected with relay (3); One end of phase line (5) is electrically connected with the second connection terminal (22); The other end of phase line (5) is electrically connected with relay (3); Residual current transformer (7) is arranged at phase line (5) with zero line (6) mutually near place, and phase line (5) and zero line (6) are through residual current transformer (7);
Described circuit arrangement (8) comprises voltage sample module (81), signal processing module (82), A/D modular converter (83), electric energy metering module (84), single chip processing module (85), relay control module (86), communication module (87), LCD display module (88), key-press module (89) and power module (80);
The voltage sample module (81) of circuit arrangement (8), signal processing module (82), A/D modular converter (83), electric energy metering module (84), single chip processing module (85), relay control module (86), communication module (87) and power module (80) are arranged in housing (1);
Voltage sample module (81) is provided with signal output part; Signal processing module (82) is provided with voltage sampling signal input end, phase line current sampled signal input end, residual current signal input part and signal output part; A/D modular converter (83) is provided with signal input part, the first signal output part and secondary signal output terminal; Electric energy metering module (84) is provided with signal input part and signal output part; Single chip processing module (85) is provided with sampled signal input end, power consumption signal input end, relay control signal output terminal, communication ends, display output terminal and push button signalling input end; Relay control module (86) is provided with signal input part and control signal output terminal; Communication module (87) is provided with internal communication ends and correspondence with foreign country end; LCD display module (88) is provided with signal input part; Key-press module (89) is provided with signal output part;
The voltage sampling signal input end of signal processing module (82), phase line current sampled signal input end and residual current signal input part are respectively with signal output part, the phase line current sampling resistor (4) of voltage sample module (81) with residual current transformer (7) is corresponding is electrically connected; The signal input part of A/D modular converter (83) is electrically connected with the signal output part of signal processing module (82); The signal input part of electric energy metering module (84) is electrically connected with the first signal output part signal of A/D modular converter (83); The sampled signal input end of single chip processing module (85) is electrically connected with the secondary signal output end signal of A/D modular converter (83); The power consumption signal input end of single chip processing module (85) is electrically connected with electric energy metering module (84) signal output part signal; The signal input part of relay control module (86) is electrically connected with the relay control signal output end signal of single chip processing module (85); The control signal output terminal of relay control module (86) is electrically connected with the control end of relay (3); The internal communication ends of communication module (87) is electrically connected with the communication ends two-way signaling of single chip processing module (85); The signal input part of LCD display module (88) is electrically connected with the display output end signal of single chip processing module (85); The signal output part of key-press module (89) is electrically connected with the push button signalling input end signal of single chip processing module (85); Power module (80) provides working power;
The communication module (87) of described circuit arrangement (8) comprises infrared communication interface, RS485 communication interface and carrier communication interface; Infrared communication interface, RS485 communication interface and carrier communication interface are respectively equipped with internal communication ends and correspondence with foreign country end; The internal communication ends of infrared communication interface, RS485 communication interface and carrier communication interface forms the internal communication ends of described communication module (87) jointly; The correspondence with foreign country end of infrared communication interface, RS485 communication interface and carrier communication interface forms the correspondence with foreign country end of described communication module (87) jointly;
The LCD display module (88) of described circuit arrangement (8) comprises being arranged on housing (1) to transfinite the LCD display of alarm information for showing power consumption, in real time residual electricity flow valuve and residual current; Key-press module (89) comprises the button being arranged on and housing (1) being consulted information interaction for user.
2. the electric energy meter measuring residual current according to claim 1, is characterized in that: the relay that described relay (3) keeps for JML82 type magnetic; Residual current transformer (7) is HLTY1 type current transformer; Phase line current sampling resistor (4) is copper-manganese sampling resistor.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420657605.3U CN204154810U (en) | 2014-11-05 | 2014-11-05 | A kind of electric energy meter measuring residual current |
| PCT/CN2015/088586 WO2016070676A1 (en) | 2014-11-05 | 2015-08-31 | Smart electric meter capable of measuring residual current |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420657605.3U CN204154810U (en) | 2014-11-05 | 2014-11-05 | A kind of electric energy meter measuring residual current |
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| Publication Number | Publication Date |
|---|---|
| CN204154810U true CN204154810U (en) | 2015-02-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420657605.3U Expired - Fee Related CN204154810U (en) | 2014-11-05 | 2014-11-05 | A kind of electric energy meter measuring residual current |
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| CN (1) | CN204154810U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016070676A1 (en) * | 2014-11-05 | 2016-05-12 | 江苏省电力公司常州供电公司 | Smart electric meter capable of measuring residual current |
| CN106569447A (en) * | 2016-11-14 | 2017-04-19 | 江苏林洋能源股份有限公司 | Electric energy meter having AC/DC adaptive electric energy measurement function and electric energy measurement method |
| CN108051624A (en) * | 2015-11-27 | 2018-05-18 | 浙江八达电子仪表有限公司 | The adjustable single-phase intelligent electric energy meter of residual current threshold value |
| CN111650426A (en) * | 2020-06-10 | 2020-09-11 | 浙江瑞银电子有限公司 | A high-current DC ammeter based on two-core technology |
-
2014
- 2014-11-05 CN CN201420657605.3U patent/CN204154810U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016070676A1 (en) * | 2014-11-05 | 2016-05-12 | 江苏省电力公司常州供电公司 | Smart electric meter capable of measuring residual current |
| CN108051624A (en) * | 2015-11-27 | 2018-05-18 | 浙江八达电子仪表有限公司 | The adjustable single-phase intelligent electric energy meter of residual current threshold value |
| CN106569447A (en) * | 2016-11-14 | 2017-04-19 | 江苏林洋能源股份有限公司 | Electric energy meter having AC/DC adaptive electric energy measurement function and electric energy measurement method |
| CN111650426A (en) * | 2020-06-10 | 2020-09-11 | 浙江瑞银电子有限公司 | A high-current DC ammeter based on two-core technology |
| CN111650426B (en) * | 2020-06-10 | 2021-06-25 | 浙江瑞银电子有限公司 | Heavy current direct current ammeter based on twin-core technique |
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