CN103592483A - System and method for maintaining metering function after null line or phase line of electronic watt-hour meter is removed - Google Patents
System and method for maintaining metering function after null line or phase line of electronic watt-hour meter is removed Download PDFInfo
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Abstract
The invention discloses a system and method for maintaining the metering function after a null line or a phase line of an electronic watt-hour meter is removed. The electronic watt-hour meter comprises a power supply unit, a voltage division circuit, a current divider, a null line current transformer and a metering module MCU, wherein the signal acquisition end of the power supply unit, the signal acquisition end of the voltage division circuit, the signal acquisition end of the current divider and the signal acquisition end of the null line current transformer are all connected with the phase line L and the null line N of a mains supply, and the signal output end of the power supply unit, the signal output end of the voltage division circuit, the signal output end of the current divider and the signal output end of the null line current transformer are all connected with the corresponding signal input end of the metering module MCU. The system further comprises a power CT and a power supply changing circuit, wherein the power CT is installed on a phase line and null line circuit in a sleeved mode and used for sensing the utilization voltage, the signal output end of the power CT is connected with the signal input end of the power supply changing circuit, and the signal output end of the power supply changing circuit is connected with the sampling signal input end of the metering module MCU. According to the system and method for maintaining the metering function after the null line or the phase line of the electronic watt-hour meter is removed, effective metering can still be achieved no matter how large the electricity load is after the voltage of the electronic watt-hour meter is removed by a user.
Description
Technical field
The present invention relates to the electric energy metrical field of electric energy meter, specifically a kind of electric energy meter falls the electricity stealing preventive metering system and method that still can measure after zero or phase line.
Background technology
At present, along with increasing of each electric appliances of family, civilian electric weight increases severely, be subject to ordering about of economic interests, stealing electricity phenomenon is also day by day serious, and various new stealing modes constantly occur, according to estimates, the whole nation reaches more than 200 hundred million yuan because of the stolen loss of electric energy every year, and abroad particularly some national stealing electricity phenomenons of South Asia are more general, has affected the normal development of power supply enterprise.Anti-theft electricity meter in the market, or anti-stealing electricity function is single, and the effectively generation of electricity theft prevention event, or cost is too high cannot large area be popularized.Some countries of South Asia particularly, user often adopts and removes voltage stealing mode, and the method is live wire or the zero line that electricity filching person attempts to remove electric energy meter, makes ammeter there is no supply voltage and cannot work.
Summary of the invention
The object of the invention is to remove for user live wire or the zero line of electric energy meter, ammeter does not have supply voltage and the problem that cannot work, proposes a kind of electronic electric energy meter of realizing and falls system and the method thereof that still can measure after zero line or phase line.
Technical scheme of the present invention is:
A kind of electronic electric energy meter of realizing falls the system that still can measure after zero line or phase line, described electronic electric energy meter comprises power supply unit, bleeder circuit, shunt, neutral line current mutual inductor and metering module MCU, described power supply unit, bleeder circuit, the signals collecting end of shunt and neutral line current mutual inductor all with the phase line L of mains supply, zero line N is connected, its signal output part is all connected with the respective signal input end of metering module MCU, described system also comprises power CT and power converting circuit, described power CT is sleeved on phase zero line loop, utilization voltage for induction electric energy table, the described signal output part of power CT and the signal input part of power converting circuit are connected, the signal output part of described power converting circuit is connected with the sampled signal input end of metering module MCU.
Power CT of the present invention comprises current transformer and sampling resistor R45, described current transformer is sleeved on phase zero line loop as the sampled signal end of power CT, the signal output part of described current transformer is connected in parallel on the two ends of sampling resistor R45, and the two ends of described sampling resistor R45 connect power converting circuit.
The rectifier bridge of power converting circuit of the present invention for consisting of diode D6-D9, the output terminal of described power converting circuit passes through current-limiting resistance R46, R41 and is connected with the respective signal input end of metering module MCU after voltage transitions chip U1.
Power supply unit of the present invention comprises voltage dependent resistor (VDR) YM, thermistor F1P, transformer T1, commutation diode D1, D3, D4, voltage stabilizing diode D2, voltage transitions chip U1, electrochemical capacitor CE3, CE4 and resistance R 17, R42, R43, the two ends of described voltage dependent resistor (VDR) YM respectively with phase line L, zero line N is connected, the zero line side of described voltage dependent resistor (VDR) YM is serially connected in an input end of transformer T1 by thermistor F1P, another input end of transformer T1 connects the phase line end of voltage dependent resistor (VDR) YM, the positive pole of an output terminal serial connection commutation diode D1 of transformer T1, one end of the negative pole contact resistance R41 of commutation diode D1, the other end of resistance R 41 connects the input end of voltage transitions chip U1, the tie point of the negative pole of commutation diode D1 and resistance R 41 is connected with the negative pole of voltage stabilizing diode D2, the anodal phase-connecting wire L of voltage stabilizing diode D2, it is metering module MCU power supply that voltage transitions chip U1 is converted to 3.3V voltage by input voltage.
Realize electronic electric energy meter and fall the method that still can measure after zero line or phase line, application of aforementioned realizes electronic electric energy meter and falls the system that still can measure after zero line or phase line, and it comprises:
When electric energy meter normally moves, power supply unit provides working power to metering module MCU and peripheral circuit work, and the upper non-inductive voltage of power CT produces;
When user removes pressure-wire, power supply unit does not produce the working power of MCU; If enabling load, user continues electricity consumption, power CT induces the utilization voltage of electric energy meter, and by power converting circuit, alternating voltage is converted to DC voltage and is sent to metering module MCU, this DC voltage is metering module MCU power supply and inputs as the signal of stealing metering, the power consumption W of described metering module MCU metering stealing load, this metering module MCU intermittence is waken metering: the W=that powers up
, wherein: the rated voltage that u is electric energy meter, i is the number of times that MCU is waken up,
for the electricity consumption electric current of this load,
the interval time of waking up for MCU intermittence.
In the present invention, when phase line L is cut off by user, the electricity consumption electric current I rms of load adopts the sample rate current of neutral line current sensor; When zero line N is cut off by user, the electricity consumption electric current I rms of load adopts the sample rate current of shunt.
System of the present invention also comprises battery or super capacitor CE2, and the power supply signal end of described battery or super capacitor CE2 is connected with the power supply signal input end of metering module MCU.
Realize electronic electric energy meter and fall the method that still can measure after zero line or phase line, application of aforementioned realizes electronic electric energy meter and falls the system that still can measure after zero line or phase line, and it comprises the following steps:
When electric energy meter normally moves, power supply unit provides working power to metering module MCU and peripheral circuit work, and the upper non-inductive voltage of power CT produces;
When user removes pressure-wire, power supply unit does not produce the working power of MCU:
If user enables, load continues electricity consumption and electric current is larger, power CT induces the utilization voltage of electric energy meter, and by power converting circuit, alternating voltage is converted to DC voltage and is sent to metering module MCU, this DC voltage is metering module MCU power supply and inputs as the signal of stealing metering, the power consumption of described metering module MCU metering stealing load;
If user enables, load continues electricity consumption and load current is very little, power CT can not respond to voltage, by battery or super capacitor, be metering module MCU power supply and input as the signal of stealing metering, described metering module MCU adopts the power consumption W of following formula metering stealing load, and this metering module MCU intermittence is waken metering: the W=that powers up
, wherein: the rated voltage that u is electric energy meter, j is the number of times that MCU is waken up,
for the electricity consumption electric current of this load,
the interval time of waking up for MCU intermittence; When load electricity consumption electric current is larger, when the DC voltage being produced by power converting circuit is metering module MCU power supply, the wakeup time of MCU is spaced apart 8-12 second; When load electricity consumption electric current is less, while being metering module MCU power supply by battery or super capacitor, the wakeup time of MCU is spaced apart 250-350 second.
In the present invention, when phase line L is cut off by user, the electricity consumption electric current I rms of load adopts the sample rate current of neutral line current sensor; When zero line N is cut off by user, the electricity consumption electric current I rms of load adopts the sample rate current of shunt.
In the present invention, if user enables, load continues electricity consumption and electric current refers to that more greatly electric current is greater than 1A, if user enables, load continues electricity consumption and load current is very little refers to that electric current is less than 1A.
Beneficial effect of the present invention:
In the present invention, in the phase zero line loop of electric energy meter, put power induction CT, when user's stealing removes after voltage, during user power utilization, power CT is upper just can induce certain voltage, the size of induced voltage is with relevant through the size of current of CT, and the stealing electric current voltage that enough power CT responds to greatly time enough guarantees electric energy meter work.On electric energy meter, design energy-storage travelling wave tube as battery or super capacitor simultaneously, when stealing electric current is very little, utilize energy-storage travelling wave tube intermittent work, thereby guarantee no matter stealing size of current can both allow electric energy meter work also monitor and calculate stealing electric weight.Even if this scheme can guarantee that power load is very little after electric energy meter is removed voltage and still can accurate-metering user use electric energy, on electric energy meter, battery power consumption is also very little simultaneously, utilizes the scheme of conventional backup battery or super capacitor can meet design requirement completely.
Accompanying drawing explanation
Fig. 1 is electric energy meter theory diagram of the present invention.
Fig. 2 is the circuit diagram of power unit of the present invention.
Fig. 3 is method flow diagram of the present invention.
Embodiment
Below in conjunction with drawings and Examples, the present invention is further illustrated.
As Figure 1-3, a kind of for the very little electricity anti-theft method that can measure of electric energy meter power load after being removed voltage even if the present invention has designed, even if the metering by different power supply modes realizes the very little object that still can guarantee metering by electric loading.At schematic diagram shown in Fig. 1, comprise power supply unit, battery or super capacitor, power CT, power converting circuit, bleeder circuit, shunt, the electric circuit constitutes such as mutual inductor and master chip MCU, when electric energy meter normally moves, power supply unit provides working power to master chip and peripheral circuit work, and the upper non-inductive voltage of power CT produces.When user removes pressure-wire, power supply unit can not produce working power, if at this moment load continues electricity consumption and current ratio is larger, on power CT, induce the utilization voltage of electric energy meter, by power conversion to electric energy meter MCU powered operation and make electricity stealing preventive metering, if load current very miniwatt CT can not respond to voltage; by energy-storage travelling wave tube to electric energy meter intermittent work and make electricity stealing preventive metering.
Power CT of the present invention comprises current transformer and sampling resistor R45, described current transformer is sleeved on phase zero line loop as the sampled signal end of power CT, the signal output part of described current transformer is connected in parallel on the two ends of sampling resistor R45, and the two ends of described sampling resistor R45 connect power converting circuit.
The rectifier bridge of power converting circuit of the present invention for consisting of diode D6-D9, the output terminal of described power converting circuit passes through current-limiting resistance R46, R41 and is connected with the respective signal input end of metering module MCU after voltage transitions chip U1.
Power supply unit of the present invention comprises voltage dependent resistor (VDR) YM, thermistor F1P, transformer T1, commutation diode D1, D3, D4, voltage stabilizing diode D2, voltage transitions chip U1, electrochemical capacitor CE3, CE4 and resistance R 17, R42, R43, the two ends of described voltage dependent resistor (VDR) YM respectively with phase line L, zero line N is connected, the zero line side of described voltage dependent resistor (VDR) YM is serially connected in an input end of transformer T1 by thermistor F1P, another input end of transformer T1 connects the phase line end of voltage dependent resistor (VDR) YM, the positive pole of an output terminal serial connection commutation diode D1 of transformer T1, one end of the negative pole contact resistance R41 of commutation diode D1, the other end of resistance R 41 connects the input end of voltage transitions chip U1, the tie point of the negative pole of commutation diode D1 and resistance R 41 is connected with the negative pole of voltage stabilizing diode D2, the anodal phase-connecting wire L of voltage stabilizing diode D2, it is metering module MCU power supply that voltage transitions chip U1 is converted to 3.3V voltage by input voltage.
Realize electronic electric energy meter and fall the method that still can measure after zero line or phase line, application of aforementioned realizes electronic electric energy meter and falls the system that still can measure after zero line or phase line, and it comprises:
When electric energy meter normally moves, power supply unit provides working power to metering module MCU and peripheral circuit work, and the upper non-inductive voltage of power CT produces;
When user removes pressure-wire, power supply unit does not produce the working power of MCU; If enabling load, user continues electricity consumption, power CT induces the utilization voltage of electric energy meter, and by power converting circuit, alternating voltage is converted to DC voltage and is sent to metering module MCU, this DC voltage is metering module MCU power supply and inputs as the signal of stealing metering, the power consumption W of described metering module MCU metering stealing load, this metering module MCU intermittence is waken metering: the W=that powers up
, wherein: the rated voltage that u is electric energy meter, i is the number of times that MCU is waken up,
for the electricity consumption electric current of this load,
the interval time of waking up for MCU intermittence.
In the present invention, when phase line L is cut off by user, the electricity consumption electric current I rms of load adopts the sample rate current of neutral line current sensor; When zero line N is cut off by user, the electricity consumption electric current I rms of load adopts the sample rate current of shunt.
System of the present invention also comprises battery or super capacitor CE2, and the power supply signal end of described battery or super capacitor CE2 is connected with the power supply signal input end of metering module MCU.
Realize electronic electric energy meter and fall the method that still can measure after zero line or phase line, application of aforementioned realizes electronic electric energy meter and falls the system that still can measure after zero line or phase line, and it comprises the following steps:
When electric energy meter normally moves, power supply unit provides working power to metering module MCU and peripheral circuit work, and the upper non-inductive voltage of power CT produces;
When user removes pressure-wire, power supply unit does not produce the working power of MCU:
If user enables, load continues electricity consumption and electric current is larger, power CT induces the utilization voltage of electric energy meter, and by power converting circuit, alternating voltage is converted to DC voltage and is sent to metering module MCU, this DC voltage is metering module MCU power supply and inputs as the signal of stealing metering, the power consumption of described metering module MCU metering stealing load;
If user enables, load continues electricity consumption and load current is very little, power CT can not respond to voltage, by battery or super capacitor, be metering module MCU power supply and input as the signal of stealing metering, described metering module MCU adopts the power consumption W of following formula metering stealing load, and this metering module MCU intermittence is waken metering: the W=that powers up
, wherein: the rated voltage that u is electric energy meter, j is the number of times that MCU is waken up,
for the electricity consumption electric current of this load,
the interval time of waking up for MCU intermittence; When load electricity consumption electric current is larger, when the DC voltage being produced by power converting circuit is metering module MCU power supply, the wakeup time of MCU is spaced apart 8-12 second; When load electricity consumption electric current is less, while being metering module MCU power supply by battery or super capacitor, the wakeup time of MCU is spaced apart 250-350 second.
In the present invention, when phase line L is cut off by user, the electricity consumption electric current I rms of load adopts the sample rate current of neutral line current sensor; When zero line N is cut off by user, the electricity consumption electric current I rms of load adopts the sample rate current of shunt.
In the present invention, if user enables, load continues electricity consumption and electric current refers to that more greatly electric current is greater than 1A, if user enables, load continues electricity consumption and load current is very little refers to that electric current is less than 1A.
The part that the present invention does not relate to all prior art that maybe can adopt same as the prior art is realized.
Claims (10)
1. realize electronic electric energy meter and fall the system that still can measure after zero line or phase line for one kind, described electronic electric energy meter comprises power supply unit, bleeder circuit, shunt, neutral line current mutual inductor and metering module MCU, described power supply unit, bleeder circuit, the signals collecting end of shunt and neutral line current mutual inductor all with the phase line L of mains supply, zero line N is connected, its signal output part is all connected with the respective signal input end of metering module MCU, it is characterized in that described system also comprises power CT and power converting circuit, described power CT is sleeved on phase zero line loop, utilization voltage for induction electric energy table, the described signal output part of power CT and the signal input part of power converting circuit are connected, the signal output part of described power converting circuit is connected with the sampled signal input end of metering module MCU.
2. the electronic electric energy meter of realizing according to claim 1 falls the system that still can measure after zero line or phase line, it is characterized in that described power CT comprises current transformer and sampling resistor R45, described current transformer is sleeved on phase zero line loop as the sampled signal end of power CT, the signal output part of described current transformer is connected in parallel on the two ends of sampling resistor R45, and the two ends of described sampling resistor R45 connect power converting circuit.
3. the electronic electric energy meter of realizing according to claim 1 falls the system that still can measure after zero line or phase line, it is characterized in that the rectifier bridge of described power converting circuit for consisting of diode D6-D9, the output terminal of described power converting circuit passes through current-limiting resistance R46, R41 and is connected with the respective signal input end of metering module MCU after voltage transitions chip U1.
4. the electronic electric energy meter of realizing according to claim 1 falls the system that still can measure after zero line or phase line, it is characterized in that described power supply unit comprises voltage dependent resistor (VDR) YM, thermistor F1P, transformer T1, commutation diode D1, D3, D4, voltage stabilizing diode D2, voltage transitions chip U1, electrochemical capacitor CE3, CE4 and resistance R 17, R42, R43, the two ends of described voltage dependent resistor (VDR) YM respectively with phase line L, zero line N is connected, the zero line side of described voltage dependent resistor (VDR) YM is serially connected in an input end of transformer T1 by thermistor F1P, another input end of transformer T1 connects the phase line end of voltage dependent resistor (VDR) YM, the positive pole of an output terminal serial connection commutation diode D1 of transformer T1, one end of the negative pole contact resistance R41 of commutation diode D1, the other end of resistance R 41 connects the input end of voltage transitions chip U1, the tie point of the negative pole of commutation diode D1 and resistance R 41 is connected with the negative pole of voltage stabilizing diode D2, the anodal phase-connecting wire L of voltage stabilizing diode D2, it is metering module MCU power supply that voltage transitions chip U1 is converted to 3.3V voltage by input voltage.
5. the electronic electric energy meter of realizing according to claim 1 falls the system that still can measure after zero line or phase line, it is characterized in that described system also comprises battery or super capacitor CE2, the power supply signal end of described battery or super capacitor CE2 is connected with the power supply signal input end of metering module MCU.
6. realize electronic electric energy meter and fall the method that still can measure after zero line or phase line, application rights requires the described electronic electric energy meter of realizing of one of 1-4 to fall the system that still can measure after zero line or phase line, it is characterized in that it comprises:
When electric energy meter normally moves, power supply unit provides working power to metering module MCU and peripheral circuit work, and the upper non-inductive voltage of power CT produces;
When user removes pressure-wire, power supply unit does not produce the working power of MCU; If enabling load, user continues electricity consumption, power CT induces the utilization voltage of electric energy meter, and by power converting circuit, alternating voltage is converted to DC voltage and is sent to metering module MCU, this DC voltage is metering module MCU power supply and inputs as the signal of stealing metering, the power consumption W of described metering module MCU metering stealing load, this metering module MCU intermittence is waken metering: the W=that powers up
, wherein: the rated voltage that u is electric energy meter, i is the number of times that MCU is waken up,
for the electricity consumption electric current of this load,
the interval time of waking up for MCU intermittence.
7. the electronic electric energy meter of realizing according to claim 6 falls the method that still can measure after zero line or phase line, it is characterized in that: when phase line L is cut off by user, the electricity consumption electric current I rms of load adopts the sample rate current of neutral line current sensor; When zero line N is cut off by user, the electricity consumption electric current I rms of load adopts the sample rate current of shunt.
8. realize electronic electric energy meter and fall the method that still can measure after zero line or phase line, application rights requires the electronic electric energy meter of realizing described in 5 to fall the system that still can measure after zero line or phase line, it is characterized in that it comprises the following steps:
When electric energy meter normally moves, power supply unit provides working power to metering module MCU and peripheral circuit work, and the upper non-inductive voltage of power CT produces;
When user removes pressure-wire, power supply unit does not produce the working power of MCU:
If user enables, load continues electricity consumption and electric current is larger, power CT induces the utilization voltage of electric energy meter, and by power converting circuit, alternating voltage is converted to DC voltage and is sent to metering module MCU, this DC voltage is metering module MCU power supply and inputs as the signal of stealing metering, the power consumption of described metering module MCU metering stealing load;
If user enables, load continues electricity consumption and load current is very little, power CT can not respond to voltage, by battery or super capacitor, be metering module MCU power supply and input as the signal of stealing metering, described metering module MCU adopts the power consumption W of following formula metering stealing load, and this metering module MCU intermittence is waken metering: the W=that powers up
, wherein: the rated voltage that u is electric energy meter, j is the number of times that MCU is waken up,
for the electricity consumption electric current of this load,
the interval time of waking up for MCU intermittence; When load electricity consumption electric current is larger, when the DC voltage being produced by power converting circuit is metering module MCU power supply, the wakeup time of MCU is spaced apart 8-12 second; When load electricity consumption electric current is less, while being metering module MCU power supply by battery or super capacitor, the wakeup time of MCU is spaced apart 250-350 second.
9. the electronic electric energy meter of realizing according to claim 8 falls the method that still can measure after zero line or phase line, it is characterized in that: when phase line L is cut off by user, the electricity consumption electric current I rms of load adopts the sample rate current of neutral line current sensor; When zero line N is cut off by user, the electricity consumption electric current I rms of load adopts the sample rate current of shunt.
10. the electronic electric energy meter of realizing according to claim 8 falls the method that still can measure after zero line or phase line, it is characterized in that: if user enables, load continues electricity consumption and electric current refers to that more greatly electric current is greater than 1A, if user enables, load continues electricity consumption and load current is very little refers to that electric current is less than 1A.
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| CN105932766A (en) * | 2016-04-18 | 2016-09-07 | 杭州海兴电力科技股份有限公司 | Power supply circuit, single-phase single-line metering circuit, and metering method |
| CN106918738A (en) * | 2015-12-28 | 2017-07-04 | 上海贝岭股份有限公司 | The metering control system of current divider in electric energy meter |
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| CN108120950A (en) * | 2018-01-29 | 2018-06-05 | 宁波三星医疗电气股份有限公司 | A kind of line electric energy meter detection metering system off zero and method |
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