CN113009219A - Intelligent electric energy meter based on broadband carrier module - Google Patents
Intelligent electric energy meter based on broadband carrier module Download PDFInfo
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- CN113009219A CN113009219A CN202110103200.XA CN202110103200A CN113009219A CN 113009219 A CN113009219 A CN 113009219A CN 202110103200 A CN202110103200 A CN 202110103200A CN 113009219 A CN113009219 A CN 113009219A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R22/00—Arrangements for measuring time integral of electric power or current, e.g. electricity meters
- G01R22/06—Arrangements for measuring time integral of electric power or current, e.g. electricity meters by electronic methods
- G01R22/061—Details of electronic electricity meters
- G01R22/063—Details of electronic electricity meters related to remote communication
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R22/00—Arrangements for measuring time integral of electric power or current, e.g. electricity meters
- G01R22/06—Arrangements for measuring time integral of electric power or current, e.g. electricity meters by electronic methods
- G01R22/061—Details of electronic electricity meters
- G01R22/066—Arrangements for avoiding or indicating fraudulent use
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R22/00—Arrangements for measuring time integral of electric power or current, e.g. electricity meters
- G01R22/06—Arrangements for measuring time integral of electric power or current, e.g. electricity meters by electronic methods
- G01R22/10—Arrangements for measuring time integral of electric power or current, e.g. electricity meters by electronic methods using digital techniques
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Remote Monitoring And Control Of Power-Distribution Networks (AREA)
- Measurement Of Current Or Voltage (AREA)
Abstract
The invention relates to the technical field of intelligent electric energy meters, in particular to an intelligent electric energy meter based on a broadband carrier module, which comprises a first current transformer, a first voltage sampling network, a first micro-power wireless communication module and an HPLC (high performance liquid chromatography) communication module, wherein the first current transformer and the first voltage sampling network are respectively arranged at a wire inlet end of the intelligent electric energy meter and are used for current sampling, the first micro-power wireless communication module is connected with the first current transformer, the HPLC communication module is arranged on the intelligent electric energy meter, a second micro-power wireless communication module is additionally arranged on the HPLC communication module, the first voltage sampling network is connected to the second micro-power wireless communication module through an AD (analog-to-digital) conversion module, the second micro-power wireless communication module is connected with the HPLC communication module, and the first micro-power wireless communication module, the second micro-power wireless communication module and. The invention realizes the online monitoring of the metering error and the electricity stealing prevention of the intelligent electric energy meter.
Description
Technical Field
The invention relates to the technical field of intelligent electric energy meters, in particular to an intelligent electric energy meter based on a broadband carrier module.
Background
The intelligent electric energy meter consists of a measuring unit, a data processing unit, a communication unit and the like, and has the functions of electric energy metering, data processing, real-time monitoring, automatic control, information interaction, HPLC communication and the like.
The working principle of the existing intelligent electric energy meter is as follows: the measured alternating voltage and current respectively complete voltage signal and current signal sampling through the resistance voltage-dividing network and the manganin shunt, the sampled signals are sent to the metering chip, the metering chip calculates the voltage, the current, the power, the electric energy and the like through the two signals, when the metering chip leaves a factory, standard values are accessed to a current channel and a voltage channel, and then the error calibration is carried out on the metering chip through the main control MCU processor.
With the improvement of an intelligent power grid greatly promoted by the national power grid company, the intelligent electric energy meter and the power consumption information acquisition system already cover 99% of users, and the existing intelligent electric energy meter has certain electricity larceny prevention functions, such as uncovering detection, comparison between live line current and zero line current detection and the like, but the electricity larceny prevention modes are the basis for judging afterwards and can not be used as the basis for real-time monitoring.
Through the classification and discovery of the electricity stealing modes, the existing electricity stealing modes are classified into the following types:
1. the metering chip does not work due to the fact that the high-frequency interference is carried out on the crystal oscillator frequency point of the metering chip;
2. changing the reference of the metering chip to cause the AD sampling of the metering chip to be misaligned;
3. the voltage channel resistance voltage-dividing network is changed, so that the sampling of the voltage channel analog signal is inaccurate;
4. the sampling of the manganin of the current channel is changed, so that the sampling of the analog signal of the current channel is inaccurate;
5. the outer outlet of the electric energy meter is in short circuit, so that the sampling signal of the current channel of the electric energy meter is reduced.
The above 5 points finally show that the error of the electric energy meter is changed. In addition, the following points may cause the error of the electric energy meter to change:
1. damage to the metering chip or peripheral circuits of the metering chip;
2. communication faults between the metering chip and the MCU processor cause the MCU to be incapable of writing the calibration parameters into the metering chip, and finally the metering error is changed;
3. the power supply of the metering chip is damaged, and the metering chip cannot work.
Therefore, whether the error caused by the problems changes or not can be monitored in real time, and finally, the on-line monitoring of the metering error and the electricity stealing prevention of the intelligent electric energy meter can be realized.
Disclosure of Invention
In order to solve the problems, the invention provides an intelligent electric energy meter based on a broadband carrier module, and aims to realize online monitoring of the metering error and electricity larceny prevention of the intelligent electric energy meter. The specific technical scheme is as follows:
the utility model provides an intelligent ammeter based on broadband carrier module, is including setting up the first current transformer that is used for the current sampling and the first voltage sampling network that is used for the voltage sampling that are used for the intelligent ammeter inlet wire end respectively, connecting first current transformer's first micropower wireless communication module, setting are in HPLC communication module on the intelligent ammeter, it is provided with second micropower wireless communication module to increase on the HPLC communication module, first voltage sampling network is connected to through AD conversion module second micropower wireless communication module, second micropower wireless communication module connects HPLC communication module, first micropower wireless communication module, second micropower wireless communication module, HPLC communication module carry out the identity when the installation and bind.
In the invention, the intelligent electric energy meter comprises a metering chip arranged in the intelligent electric energy meter and an MCU processor connected with the metering chip, and the HPLC communication module is connected with the MCU processor of the intelligent electric energy meter.
Wherein, the MCU processor is connected with an internal memory.
And the MCU processor is provided with an RS485 infrared communication interface.
Preferably, a second current transformer for current sampling is arranged at the wire inlet end of the intelligent electric energy meter, and the second current transformer is connected with the metering chip of the intelligent electric energy meter.
In the invention, the wire inlet end of the intelligent electric energy meter is provided with a second voltage sampling network for voltage sampling, and the second voltage sampling network is connected with a metering chip of the intelligent electric energy meter.
Preferably, the intelligent electric energy meter inlet wire end is provided with a manganin shunt for current sampling, and the manganin shunt is connected with the metering chip of the intelligent electric energy meter.
In the invention, the broadband carrier module judges the internal fault information of the electric energy meter by the following method: and the broadband carrier module acquires the specific voltage value through the MCU processor and judges the type of internal faults of the electric energy meter according to the specific voltage value.
Preferably, the first specific voltage value is set to 10V, and the second specific voltage value is set to 20V.
Preferably, the broadband carrier module further determines whether there is an electricity stealing phenomenon by the following method:
(1) the micropower wireless module samples the current of the inlet wire end of the intelligent electric energy meter through the first current transformer, simultaneously digitalizes the current, and transmits current waveform data with time scales to the HPLC communication module;
(2) the HPLC communication module performs voltage sampling through a first voltage sampling network to obtain voltage waveform data with time scales;
(3) the HPLC communication module performs FFT calculation according to the obtained current waveform data with the time scale and the voltage waveform data with the time scale to obtain effective values of voltage, current and power;
(4) the HPLC communication module obtains voltage, current and power sampled by a metering chip of the intelligent electric energy meter through an MCU processor of the intelligent electric energy meter;
(5) the HPLC communication module obtains voltage and current through FFT calculation, compares the voltage and current obtained through sampling of a metering chip of the intelligent electric energy meter with the voltage and current obtained through sampling, obtains changing values of voltage and current channels, judges which channel is changed and what the changing value is according to the changing values of the voltage and current channels, and judges whether electricity stealing phenomena exist according to the changing values of the voltage and current channels.
More preferably, the broadband carrier module further determines the severity of electricity stealing by: and comparing the power obtained by FFT calculation with the power obtained by sampling voltage and current by a metering chip of the intelligent electric energy meter to obtain a power change value, and judging the severity of electricity stealing according to the power change value.
The invention has the beneficial effects that:
firstly, the intelligent electric energy meter based on the broadband carrier module performs voltage sampling calculation by adding a resistance voltage division network on an original HPLC module; the current sampling is carried out by adding a micropower wireless communication module and a current transformer CT at a current inlet end. And the HPLC module compares the voltage and the current obtained by sampling with the voltage and the current sampled by a metering chip of the intelligent electric energy meter to obtain the change values of the voltage and the current channels, and whether the electricity stealing phenomenon exists or not can be judged according to the change values of the voltage and the current channels. Therefore, the online monitoring of the metering error and the electricity larceny prevention of the intelligent electric energy meter is realized.
Secondly, according to the intelligent electric energy meter based on the broadband carrier module, the HPLC module can also obtain the change value of the power through FFT calculation, and the severity of the electricity stealing is judged according to the change value of the power.
Drawings
Fig. 1 is a schematic structural diagram of a broadband carrier module arranged on an intelligent electric energy meter.
The lower half part in the figure is an intelligent electric energy meter, and the upper half part is a broadband carrier module.
In the figure, "CT" in the box represents the first current transformer, "CT sample" in the box represents the second current transformer, and "manganin sample" in the box represents the manganin shunt.
In the figure, the voltage sample (in a square box) connected with the AD conversion module is a first voltage sampling network, and the voltage sample (in a square box) connected with the metering chip is a second voltage sampling network.
Detailed Description
The following description of the embodiments of the present invention will be made with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
Fig. 1 shows an embodiment of an intelligent electric energy meter based on a broadband carrier module according to the present invention, which includes a first current transformer and a first voltage sampling network respectively disposed at an incoming line end of the intelligent electric energy meter for current sampling, a first micro-power wireless communication module connected to the first current transformer, and an HPLC communication module disposed on the intelligent electric energy meter, wherein a second micro-power wireless communication module is additionally disposed on the HPLC communication module, the first voltage sampling network is connected to the second micro-power wireless communication module through an AD conversion module, the second micro-power wireless communication module is connected to the HPLC communication module, and the first micro-power wireless communication module, the second micro-power wireless communication module, and the HPLC communication module are identity bound when they are installed.
In this embodiment, the intelligent electric energy meter includes a metering chip arranged inside the intelligent electric energy meter and an MCU processor connected to the metering chip, and the HPLC communication module is connected to the MCU processor of the intelligent electric energy meter.
Wherein, the MCU processor is connected with an internal memory.
And the MCU processor is provided with an RS485 infrared communication interface.
Preferably, a second current transformer for current sampling is arranged at the wire inlet end of the intelligent electric energy meter, and the second current transformer is connected with the metering chip of the intelligent electric energy meter.
In this embodiment, the intelligent electric energy meter incoming line end is provided with a second voltage sampling network for voltage sampling, and the second voltage sampling network is connected with the metering chip of the intelligent electric energy meter.
Preferably, the intelligent electric energy meter inlet wire end is provided with a manganin shunt for current sampling, and the manganin shunt is connected with the metering chip of the intelligent electric energy meter.
In this embodiment, the broadband carrier module determines the internal fault information of the electric energy meter by the following method: and the broadband carrier module acquires the specific voltage value through the MCU processor and judges the type of internal faults of the electric energy meter according to the specific voltage value.
Preferably, the first specific voltage value is set to 10V, and the second specific voltage value is set to 20V.
Preferably, the broadband carrier module further determines whether there is an electricity stealing phenomenon by the following method:
(1) the micropower wireless module samples the current of the inlet wire end of the intelligent electric energy meter through the first current transformer, simultaneously digitalizes the current, and transmits current waveform data with time scales to the HPLC communication module;
(2) the HPLC communication module performs voltage sampling through a first voltage sampling network to obtain voltage waveform data with time scales;
(3) the HPLC communication module performs FFT calculation according to the obtained current waveform data with the time scale and the voltage waveform data with the time scale to obtain effective values of voltage, current and power;
(4) the HPLC communication module obtains voltage, current and power sampled by a metering chip of the intelligent electric energy meter through an MCU processor of the intelligent electric energy meter;
(5) the HPLC communication module obtains voltage and current through FFT calculation, compares the voltage and current obtained through sampling of a metering chip of the intelligent electric energy meter with the voltage and current obtained through sampling, obtains changing values of voltage and current channels, judges which channel is changed and what the changing value is according to the changing values of the voltage and current channels, and judges whether electricity stealing phenomena exist according to the changing values of the voltage and current channels.
More preferably, the broadband carrier module further determines the severity of electricity stealing by: and comparing the power obtained by FFT calculation with the power obtained by sampling voltage and current by a metering chip of the intelligent electric energy meter to obtain a power change value, and judging the severity of electricity stealing according to the power change value.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the technical principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (7)
1. An intelligent electric energy meter based on a broadband carrier module is characterized by comprising a metering chip arranged in the intelligent electric energy meter, an MCU processor connected with the metering chip, a first current transformer for current sampling and a first voltage sampling network for voltage sampling which are respectively arranged at a wire inlet end of the intelligent electric energy meter, a first micropower wireless communication module connected with the first current transformer, and an HPLC communication module arranged on the intelligent electric energy meter, wherein a second micropower wireless communication module is additionally arranged on the HPLC communication module, the first voltage sampling network is connected to the second micropower wireless communication module through an AD conversion module, the second micropower wireless communication module is connected with the HPLC communication module, and the first micropower wireless communication module, the second micropower wireless communication module and the HPLC communication module are subjected to identity binding when being installed, the HPLC communication module is connected with the MCU processor of the intelligent electric energy meter; the broadband carrier module judges the internal fault information of the electric energy meter by the following method: and the broadband carrier module acquires the specific voltage value through the MCU processor and judges the type of internal faults of the electric energy meter according to the specific voltage value.
2. The intelligent electric energy meter based on the broadband carrier module according to claim 1, wherein a second current transformer for current sampling is arranged at a wire inlet end of the intelligent electric energy meter, and the second current transformer is connected with a metering chip of the intelligent electric energy meter.
3. The intelligent electric energy meter based on the broadband carrier module according to claim 1, wherein a second voltage sampling network for voltage sampling is arranged at a wire inlet end of the intelligent electric energy meter, and the second voltage sampling network is connected with a metering chip of the intelligent electric energy meter.
4. The intelligent electric energy meter based on the broadband carrier module according to claim 1, wherein a manganin shunt for current sampling is arranged at a wire inlet end of the intelligent electric energy meter, and the manganin shunt is connected with a metering chip of the intelligent electric energy meter.
5. The intelligent electric energy meter based on the broadband carrier module as claimed in claim 1, wherein the first specific voltage value is set to 10V, and the second specific voltage value is set to 20V.
6. The intelligent electric energy meter based on the broadband carrier module according to claim 5, wherein the broadband carrier module further determines whether there is electricity stealing phenomenon by the following method:
(1) the micropower wireless module samples the current of the inlet wire end of the intelligent electric energy meter through the first current transformer, simultaneously digitalizes the current, and transmits current waveform data with time scales to the HPLC communication module;
(2) the HPLC communication module performs voltage sampling through a first voltage sampling network to obtain voltage waveform data with time scales;
(3) the HPLC communication module performs FFT calculation according to the obtained current waveform data with the time scale and the voltage waveform data with the time scale to obtain effective values of voltage, current and power;
(4) the HPLC communication module obtains voltage, current and power sampled by a metering chip of the intelligent electric energy meter through an MCU processor of the intelligent electric energy meter;
(5) the HPLC communication module obtains voltage and current through FFT calculation, compares the voltage and current obtained through sampling of a metering chip of the intelligent electric energy meter with the voltage and current obtained through sampling, obtains changing values of voltage and current channels, judges which channel is changed and what the changing value is according to the changing values of the voltage and current channels, and judges whether electricity stealing phenomena exist according to the changing values of the voltage and current channels.
7. The intelligent electric energy meter based on the broadband carrier module as claimed in claim 6, wherein the broadband carrier module further determines the severity of electricity stealing by: and comparing the power obtained by FFT calculation with the power obtained by sampling voltage and current by a metering chip of the intelligent electric energy meter to obtain a power change value, and judging the severity of electricity stealing according to the power change value.
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| CN202110103200.XA CN113009219A (en) | 2021-01-26 | 2021-01-26 | Intelligent electric energy meter based on broadband carrier module |
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| CN202110103200.XA CN113009219A (en) | 2021-01-26 | 2021-01-26 | Intelligent electric energy meter based on broadband carrier module |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102445578A (en) * | 2011-11-08 | 2012-05-09 | 辽宁省电力有限公司葫芦岛供电公司 | Electricity stealing prevention inspecting and monitoring detector |
| CN103954816A (en) * | 2014-04-30 | 2014-07-30 | 国网上海市电力公司 | Inelegant remote anti-electricity-stealing inspection method |
| CN110308314A (en) * | 2019-06-12 | 2019-10-08 | 威胜电气有限公司 | Low-voltage anti-theft electric switch and its electricity anti-theft method |
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2021
- 2021-01-26 CN CN202110103200.XA patent/CN113009219A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102445578A (en) * | 2011-11-08 | 2012-05-09 | 辽宁省电力有限公司葫芦岛供电公司 | Electricity stealing prevention inspecting and monitoring detector |
| CN103954816A (en) * | 2014-04-30 | 2014-07-30 | 国网上海市电力公司 | Inelegant remote anti-electricity-stealing inspection method |
| CN110308314A (en) * | 2019-06-12 | 2019-10-08 | 威胜电气有限公司 | Low-voltage anti-theft electric switch and its electricity anti-theft method |
Non-Patent Citations (3)
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| 王毅: "分布式电源入网的反窃电综合管理方法", 《科学家》 * |
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