CN104360140B - Single-phase electric energy meter neutral line current measuring method and measuring circuit - Google Patents
Single-phase electric energy meter neutral line current measuring method and measuring circuit Download PDFInfo
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- CN104360140B CN104360140B CN201410700618.9A CN201410700618A CN104360140B CN 104360140 B CN104360140 B CN 104360140B CN 201410700618 A CN201410700618 A CN 201410700618A CN 104360140 B CN104360140 B CN 104360140B
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Abstract
The invention discloses a kind of single-phase electric energy meter neutral line current measuring method and measuring circuit, initially with the differential electrical flow valuve that a current sensor obtains the output of live wire electric current and the input of neutral line current；And obtain live wire current value；Neutral line current value is obtained in real time according to the differential electrical flow valuve and live wire current value.The present invention adopts difference measurement mode, merely with a current sensor, the output of sampling live wire electric current is input into neutral line current simultaneously, neutral line current value is obtained thus, it is possible to accurate, the technical requirements of neutral line current sensor are substantially reduced, the current measurement dynamic range of the current sensor is 100:Within 1, current measurement dynamic range is greatly reduced, reduces sensor material cost and manufacturing cost, while the performance requirement and hardware cost of computation chip zero line sampling channel ADC can also be reduced.
Description
Technical field
The present invention relates to a kind of single-phase electric energy meter neutral line current measuring method and measuring circuit.
Background technology
As social development, the popularization of the various big power consumption living electric apparatus of residential households, household electricity load constantly increase,
The electricity charge become one of important daily life spending for family, and people also increasingly increase to the degree of concern of the electricity charge, in society
Various panoramic electricity filching means are constantly gushed out, and wherein zero line measurement becomes the requisite thief-proof electro-detection of electric energy meter one
Means.
Existing neutral line current measuring method generally gathers neutral line current using single current sensor, as electricity consumption is born
The increase of lotus, the dynamic range requirement of neutral line current sensor are relatively wide, and dynamic range is more than 1000:1, cause cost accordingly to increase
Plus.
Content of the invention
It is an object of the invention to provide a kind of single-phase electric energy meter neutral line current measurement side of inexpensive, highly reliable, easy realization
Method and measuring circuit.
This single-phase electric energy meter neutral line current measuring method that the present invention is provided, the method comprise the steps：
Step one, the difference current that the output of live wire electric current and the input of neutral line current are obtained using a current sensor
Value；And obtain live wire current value；
Step 2, obtains neutral line current value in real time according to the differential electrical flow valuve and live wire current value.
The live wire current value is obtained using live wire current sensor.The live wire current sensor adopts electromagnetic type electric current
Transformer CT or copper-manganese.
The method also includes arranging stealing judgment threshold；Ratio of the differential electrical flow valuve with live wire current value is stolen with being somebody's turn to do
Electric judgment threshold is compared, if the ratio is more than or equal to the stealing judgment threshold, infers that now electric energy meter is in stealing
State.
The stealing decision threshold is the foundation that electric current stealing judges；Specification of the value before dispatching from the factory according to electric energy meter, should
It is configured with situation.
A kind of single-phase electric energy meter neutral line current measuring circuit, defeated including live wire current sensor, live wire input terminal, live wire
Go out terminal, zero line input terminal, zero line output terminal, load and electric energy computation chip, it is characterised in that it is poor that the circuit also includes
Current sensor, differential current sensor collection is divided to flow through the live wire output current value of fire wire output end and flow through zero line input
The differential electrical flow valuve of the neutral line current input value of terminal；Live wire is input into by live wire input terminal, then passes through live wire current sense
Device, is obtained after live wire current value again via fire wire output end son output by the sensor；Zero line is input into by zero line input terminal, so
Exported by zero line output terminal afterwards；Load is connected between fire wire output end and zero line input terminal；Live wire current sensor is also
It is connected with electric energy computation chip；Differential current sensor is also connected with electric energy computation chip.
The outfan of the live wire current sensor is connected with the ADC ports of electric energy computation chip, for gathering live wire electricity
Flow valuve.The outfan of the differential current sensor is connected with the ADC ports of electric energy computation chip, for gathering live wire electric current
Output and the differential electrical flow valuve of the input of neutral line current.
The present invention adopts difference measurement mode, and merely with a current sensor, sampling live wire electric current is exported and zero line simultaneously
Electric current is input into, and obtains neutral line current value thus, it is possible to accurate, substantially reduces the technical requirements of neutral line current sensor, the current sense
The current measurement dynamic range of device is 100:Within 1, be greatly reduced current measurement dynamic range, reduce sensor material into
Sheet and manufacturing cost, while the performance requirement and hardware cost of computation chip zero line sampling channel ADC can also be reduced.Additionally,
The present invention can be that electricity consumption department is prevented, on the premise of given threshold, to judge with the presence or absence of stealing to electric energy meter
Stealing work contributes.
Description of the drawings
Fig. 1 is one embodiment of the present invention schematic diagram.
Specific embodiment
The present invention obtains neutral line current value by the way of difference measurement, and thus can also whether there is stealing to electric energy meter
Behavior is precisely judged that concrete step is as follows：
Step one, the difference current that the output of live wire electric current and the input of neutral line current are obtained using a current sensor
ValueI LN；And obtain live wire current valueI L；
Step 2, using the differential electrical flow valuveI LNWith live wire current valueI LNeutral line current value is obtained in real timeI N.
Additionally, the present invention can also add following steps, electricity filching behavior is determined whether.
Step 3, arranges stealing judgment threshold E；By the differential electrical flow valuveI LNWith live wire current valueI LRatio with should steal
Electric judgment threshold E is compared, if the ratio is more than or equal to the stealing judgment threshold, infers that now electric energy meter is in stealing
State.
With reference to embodiment, the present invention is further illustrated.
As shown in figure 1, the present invention includes live wire current sensor, differential current sensor, live wire input terminal L_A, fire
The sub- L_B of line output terminal, zero line input terminal N_A, zero line output terminal N_B, load and electric energy computation chip.
Live wire is input into by live wire input terminal L_A, then by live wire current sensor, by the sensor acquisition live wire
Current valueI LAfterwards by the sub- L_B outputs of fire wire output end；Zero line is input into by zero line input terminal N_A, then by zero line output terminal
N_B is exported；Differential current sensor collection flows through the live wire output current value of binding post L_B and flows through binding post N_A's
The differential electrical flow valuve of neutral line current input valueI LN.Load is connected between the sub- L_B of fire wire output end and zero line input terminal N_A.
The outfan of live wire current sensor is connected with the ADC ports of electric energy computation chip, for gathering live wire current value
IL.The outfan of differential current sensor is connected with the ADC ports of electric energy computation chip, for gather the output of live wire electric current with
The differential electrical flow valuve of the input of neutral line currentI LN.
The electric energy computation chip of the present invention is sampled using the electric energy computation chip with three road independent samples, three road ADC
Port gathers the differential electrical flow valuve of the input of the output and neutral line current of live wire electric current and live wire electric current respectively.
The live wire current sensor of the present invention can adopt Current Transmit or copper-manganese sampling relay.Live wire input terminal
The sub- L_B of L_A, fire wire output end, zero line input terminal N_A and zero line output terminal N_B are binding post.
In theory, live wire electric current output identically vanishing line current input in the case of without stealing, i.e., using difference side
The differential current sensor measured value of method samplingI LNShould be zero, the live wire electricity for then being measured using the sampling of live wire current sensor
Flow valuve can be obtained by the size of neutral line current；And the electric current measured using live wire current measurement value, differential current sensor
Whether value and corresponding computational methods just can accurately judge ammeter in stealing state.
In theory in the state of without stealing, live wire current value equal to neutral line current value is：I L=I N, differential electrical spreads
Sensor measures the current value of the output of live wire electric current and neutral line current inputI LN=0.
In actual applications, due to the discreteness and its calculation error of MCU of each device of electric energy meter, even if without stealing shape
Under stateI LNZero, i.e. neutral line current will not be also equal toI N=I L+I LN.
If the difference current between the zero line live wire of differential current sensor measurementI LNWith live wire electric currentI LRatio be more than
Stealing decision threshold E（E can be arranged when ammeter dispatches from the factory）, i.e.,I LN/I L>=E, then can accurately judge that now electric energy meter is in surreptitiously
Electricity condition, can notify relevant staff to remove scene evidence taking.
Stealing decision threshold E of the present invention is the foundation that electric current stealing judges, is the parameter that freely can be arranged, should go out
Specification and its applicable cases before factory according to electric energy meter is configured.
Claims (8)
1. a kind of single-phase electric energy meter neutral line current measuring method, the method comprise the steps：
Step one, the differential electrical flow valuve that the output of live wire electric current and the input of neutral line current are obtained using a current sensor；
And obtain live wire current value；
Step 2, obtains neutral line current value in real time according to the differential electrical flow valuve and live wire current value.
2. single-phase electric energy meter neutral line current measuring method according to claim 1, it is characterised in that the live wire current value
Obtained using live wire current sensor.
3. single-phase electric energy meter neutral line current measuring method according to claim 2, it is characterised in that the live wire electric current is passed
Sensor is using electromagnetic current transducer CT or copper-manganese.
4. single-phase electric energy meter neutral line current measuring method according to claim 1, it is characterised in that the method also includes setting
Put stealing judgment threshold；Ratio of the differential electrical flow valuve with live wire current value is compared with the stealing judgment threshold, if
More than or equal to the stealing judgment threshold, the ratio then infers that now electric energy meter is in stealing state.
5. single-phase electric energy meter neutral line current measuring method according to claim 4, it is characterised in that the stealing judges valve
It is worth the foundation judged for electric current stealing；Specification of the value before dispatching from the factory according to electric energy meter, applicable cases are configured.
6. a kind of single-phase electric energy meter neutral line current measuring circuit, exports including live wire current sensor, live wire input terminal, live wire
Terminal, zero line input terminal, zero line output terminal, load and electric energy computation chip, it is characterised in that the circuit also includes difference
Current sensor, differential current sensor collection flow through the live wire output current value of fire wire output end and flow through zero line input
The differential electrical flow valuve of the neutral line current input value of son；Live wire is input into by live wire input terminal, then by live wire current sensor,
Obtained after live wire current value again via fire wire output end son output by the live wire current sensor；Zero line is defeated by zero line input terminal
Enter, then exported by zero line output terminal；Load is connected between fire wire output end and zero line input terminal；Live wire current sense
Device is also connected with electric energy computation chip；Differential current sensor is also connected with electric energy computation chip.
7. single-phase electric energy meter neutral line current measuring circuit according to claim 6, it is characterised in that the live wire electric current is passed
The outfan of sensor is connected with the ADC ports of electric energy computation chip, for gathering live wire current value.
8. single-phase electric energy meter neutral line current measuring circuit according to claim 6, it is characterised in that the differential electrical spreads
The outfan of sensor is connected with the ADC ports of electric energy computation chip, and the output for gathering live wire electric current is defeated with neutral line current
The differential electrical flow valuve for entering.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410700618.9A CN104360140B (en) | 2014-11-28 | 2014-11-28 | Single-phase electric energy meter neutral line current measuring method and measuring circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410700618.9A CN104360140B (en) | 2014-11-28 | 2014-11-28 | Single-phase electric energy meter neutral line current measuring method and measuring circuit |
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| CN104360140A CN104360140A (en) | 2015-02-18 |
| CN104360140B true CN104360140B (en) | 2017-03-15 |
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Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107621562B (en) * | 2017-07-21 | 2019-04-16 | 国网浙江省电力公司 | A kind of single-phase meter shunting accurate judgement method for analyzing stealing |
| CN107656231A (en) * | 2017-07-21 | 2018-02-02 | 国网浙江省电力公司 | A kind of electric energy meter game clock lid event analysis of the accuracy method |
| CN108627796A (en) * | 2018-07-27 | 2018-10-09 | 国家电网有限公司 | A kind of detection method of electric energy meter, detection device and terminal |
| CN109655778A (en) * | 2018-12-27 | 2019-04-19 | 国网湖南省电力有限公司 | The quickly method of investigation stealing |
| CN111007436A (en) * | 2019-12-27 | 2020-04-14 | 广东电科院能源技术有限责任公司 | Electric leakage detection device |
| CN111239673B (en) * | 2020-02-07 | 2022-06-07 | 云南电网有限责任公司电力科学研究院 | System and method for detecting residual current metering precision of electric energy meter |
| CN112540210B (en) * | 2020-12-04 | 2023-10-31 | 天目数据(福建)科技有限公司 | Method for identifying abnormal users of zero line and live line, method for identifying anti-electricity-stealing and storage medium |
| CN113391120B (en) * | 2021-05-31 | 2021-12-17 | 宁波迦南智能电气股份有限公司 | Electric energy metering method for single-phase meter with live wire or zero wire falling |
| CN114002469B (en) * | 2021-11-03 | 2023-10-03 | 国网四川省电力公司成都供电公司 | Method and device for detecting electricity theft and electricity theft detector |
| CN114200384B (en) * | 2021-12-14 | 2023-08-29 | 国网黑龙江省电力有限公司供电服务中心 | Electric energy meter detection device with multiple detection modes |
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| CN102236086B (en) * | 2010-04-29 | 2013-07-03 | 杭州市电力局 | Method and device for inspecting electric energy meter |
| KR20130028460A (en) * | 2011-09-09 | 2013-03-19 | 엘에스산전 주식회사 | An electric meter for sensing current of three phase system utilizing shunt resistors |
| CN203275642U (en) * | 2013-06-05 | 2013-11-06 | 国家电网公司 | Simple test device for broken-down electric energy meter |
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Effective date of registration: 20220222 Address after: 410000 the whole floor of the fourth floor of plant 101, phase II project of Weisheng science and Technology Park, No. 468, tongzipo West Road, high tech Development Zone, Changsha City, Hunan Province Patentee after: Changsha Zhongkun Electronic Technology Co.,Ltd. Address before: 410205 No. 468 west slope, Changsha hi tech Development Zone, Changsha, Hunan, Yuelu District, Tongzi Patentee before: WASION Group Ltd. |