CN105932766B - A power supply circuit, a single-phase single-wire metering circuit and a metering method - Google Patents
A power supply circuit, a single-phase single-wire metering circuit and a metering method Download PDFInfo
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- CN105932766B CN105932766B CN201610246655.6A CN201610246655A CN105932766B CN 105932766 B CN105932766 B CN 105932766B CN 201610246655 A CN201610246655 A CN 201610246655A CN 105932766 B CN105932766 B CN 105932766B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
- H02J9/061—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems for DC powered loads
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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
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- Engineering & Computer Science (AREA)
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- Business, Economics & Management (AREA)
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- Measurement Of Current Or Voltage (AREA)
Abstract
The present invention relates to a kind of power supply circuit, single-phase single line metering circuit and metering methods.The object of the present invention is to provide a kind of single-phase single line metering circuit and metering methods, to realize the electrical energy measurement in the case of single-phase single line.The technical scheme is that a kind of single-phase single line metering circuit, it is characterised in that: have metering and data processing circuit and power supply circuit, in which: described measure with data processing circuit includes sample circuit and continuous data processing unit；Sample circuit, including neutral line current sample circuit, firewire current sampling circuit and alternating voltage sampling circuit；Continuous data processing unit is electrically connected with neutral line current sample circuit, firewire current sampling circuit and alternating voltage sampling circuit；The power supply circuit, DC output end are electrically connected with the continuous data processing unit, are powered for continuous data processing unit.The present invention is suitable for electrical energy measurement field.
Description
Technical field
The present invention relates to a kind of power supply circuit, single-phase single line metering circuit and metering methods.Suitable for electrical energy measurement field.
Background technique
In modern main development and less developed country, area, the case where single line stealing, emerges one after another.Single line stealing it is main
Stealing electricity method is that access zero curve is cut off or will be entered in meter input terminal in the single-phase-two-wire network system of general civilian electricity
Family firewire cuts off and is shorted to electric energy meter access zero line side, leads to conventional single-phase-two-wire electric energy meter because cannot without voltage
Work, to achieve the purpose that stealing.
It makes a general survey of international and domestic, rarely has the effective method for such violence electricity filching means, at this stage main prevention and treatment side
Find that electric energy meter does not work (stealing of period has become the fact, but not energetic) when method is subsequent power office's inspection.User is adopted
The punitive measures being had a power failure with fine or stage, often due to user, which denies, leads to lawsuit, largely without live evidence
Waste of manpower resource.
Summary of the invention
The technical problem to be solved by the present invention is in view of the above problems, providing a kind of single-phase single line metering circuit
And metering method, to realize the electrical energy measurement in the case of single-phase single line.
The present invention also provides a kind of power supply electricity that direct current can be exported under power grid normal operation and single line operating status
Road.
The technical scheme adopted by the invention is that: a kind of power supply circuit exports direct current on power grid, and feature exists
In: including working normally power supply circuit and single-line operation power supply circuit, wherein
Power supply circuit is worked normally, is worked when power grid operates normally, there is lowering and stabilizing blood pressure rectification circuit and low pressure pressure stabilizing
Chip U1, power grid export direct current after lowering and stabilizing blood pressure rectification circuit and low pressure voltage stabilizing chip U1；
Single-line operation power supply circuit works in the operation of power grid single line, has power transformer, pressure stabilizing rectification circuit and low
Voltage stabilizing chip U1 is pressed, power grid exports direct current after power transformer, pressure stabilizing rectification circuit and low pressure voltage stabilizing chip U1.
The lowering and stabilizing blood pressure rectification circuit includes step-down rectifying circuit and voltage regulator circuit, and step-down rectifying circuit has triode
Q1, diode D9, D10, D11, D12 and capacitor C9.
Power grid firewire successively connects diode D12 anode and diode D11 anode, firewire and two in the step-down rectifying circuit
The tie point of pole pipe D12 is grounded；Zero curve is divided into two-way after capacitor C9, resistance R23, connects diode D9 anode, diode all the way
D9 cathode is connected with diode D11 cathode, and another way connects the base stage of triode Q1 through resistance R26, triode Q1 grounded collector,
Triode Q1 transmitter connects the tie point of diode D12 Yu diode D11, triode Q1 transmitter connection two through electrolytic capacitor E1
Pole pipe D10 anode, the tie point of diode D10 cathode connecting resistance R23 and triode Q1.
A kind of single-phase single line metering circuit, it is characterised in that: there is metering and data processing circuit and power supply circuit,
In:
The metering and data processing circuit include sample circuit and continuous data processing unit；
Sample circuit, including neutral line current sample circuit, firewire current sampling circuit and alternating voltage sampling circuit；
Continuous data processing unit samples electricity with neutral line current sample circuit, firewire current sampling circuit and alternating voltage
Road electrical connection；
The power supply circuit, DC output end are electrically connected with the continuous data processing unit, are handled for continuous data
Unit power supply.
The firewire current sampling circuit has manganese copper diverter and anti-aliasing circuit I, wherein manganese copper diverter sampling fire
Line current, manganese copper diverter are electrically connected through anti-aliasing circuit I with the continuous data processing unit.
The neutral line current sample circuit has current transformer, reduction voltage circuit and anti-aliasing circuit II, and wherein electric current is mutual
Sensor samples neutral line current, and current transformer is electrically connected through reduction voltage circuit and anti-aliasing circuit II with the continuous data processing unit
It connects.
The alternating voltage sampling circuit has resistor voltage divider circuit and decoupling circuit, and power grid alternating current is through electric resistance partial pressure electricity
Road, decoupling circuit are electrically connected with the continuous data processing unit.
A kind of single-phase single line metering method, it is characterised in that steps are as follows:
S01, cut-in voltage sampling, sample grid ac voltage；
S02, the size for judging comparison voltage sampled value and single line metering threshold values, if voltage sample value is less than or equal to single line meter
Amount threshold values then enters step S03, on the contrary then enter step S04；
S03, single line quantitative model close voltage sample, sample firewire electric current or neutral line current, and according to firewire or zero curve
Current sampling data measure electricity consumption；
S04, normal quantitative model measure electricity consumption according to voltage sample value.
The method of step S03 is as follows:
S031, voltage sample is closed；
S032, firewire current sample is opened；
S033, judgement compare the size of firewire current sampling data and starting metering threshold values, if firewire current sampling data is greater than
Starting metering threshold values then enters step S034, otherwise enters step S035；
S034, it is measured according to firewire current sampling data scaled voltage, closes firewire current sample, enter step S038；
S035, firewire current sample is closed, opens neutral line current sampling；
S036, judgement compare the size of neutral line current sampled value and starting metering threshold values, if neutral line current sampled value is greater than
Starting metering threshold values then enters step S037, otherwise return step S01；
S037, it is measured according to neutral line current sampled value scaled voltage, closes neutral line current sampling, enter step S038；
S038, processing electrical energy pulse, electrical energy measurement, return step S01.
The method of step S03 is as follows:
S031, voltage sample is closed；
S032, neutral line current sampling is opened；
S033, judgement compare the size of neutral line current sampled value and starting metering threshold values, if neutral line current sampled value is greater than
Starting metering threshold values then enters step S034, otherwise enters step S035；
S034, it is measured according to neutral line current sampled value scaled voltage, closes neutral line current sampling, enter step S038；
S035, neutral line current sampling is closed, opens firewire current sample；
S036, judgement compare the size of firewire current sampling data and starting metering threshold values, if firewire current sampling data is greater than
Starting metering threshold values then enters step S037, otherwise return step S01；
S037, it is measured according to firewire current sampling data scaled voltage, closes firewire current sample, enter step S038；
S038, processing electrical energy pulse, electrical energy measurement, return step S01.
The beneficial effects of the present invention are: fire when power supply circuit obtains the operation of power grid single line by power transformer in the present invention
Electric current and output voltage on line or zero curve, so that also exportable direct current is that related component supplies in the operation of power grid single line
Electricity.
Single-phase single line metering circuit passes through alternating voltage sampling circuit, neutral line current sample circuit and firewire electricity in the present invention
Sampling circuit samples grid ac voltage, neutral line current and firewire electric current are flowed, the electrical energy measurement in single-phase single line is reached
(the wherein disconnection of zero firewire), quantifies and exports the electricity consumption situation of single house lead in, be limited to subsequent single line stealing offer amount
Change foundation.
Detailed description of the invention
Fig. 1 is the circuit diagram of embodiment.
Fig. 2 is the flow chart of metering method in embodiment.
Specific embodiment
Fig. 1 is the circuit diagram of the present embodiment, and the present embodiment realizes that single line measures function using SOC data processing chip
Energy.Functional circuit mainly divides two major parts: power supply circuit 5, and metering with data processing circuit (comprising voltage sample, current sample,
Data processing).
In the present embodiment metering with data processing circuit include firewire current sampling circuit 2, neutral line current sample circuit 3,
Alternating voltage sampling circuit 4 and continuous data processing unit 1 (being made of SOC data processing chip and its peripheral circuit).
Wherein firewire current sampling circuit 2 has manganese copper diverter and anti-aliasing circuit I, wherein manganese copper diverter sampling fire
Line current, manganese copper diverter are electrically connected through anti-aliasing circuit I with continuous data processing unit.Anti-aliasing circuit I has resistance R1,
R2 and capacitor C3, C4, C7, capacitor C3, C4, C7 are connected into a circle, the tie point ground connection of capacitor C3, C4, the both ends capacitor C7 difference
Manganese copper diverter both ends are connect through resistance R1, R2, the both ends capacitor C7 are also respectively connected to SOC data processing chip.Current signal passes through
Manganese copper diverter ratio is converted to low voltage signal, and by anti-aliasing circuit I, differential signal inputs SOC data processing chip phase
The sampling unit pin answered is with signal acquisition.
Neutral line current sample circuit 3 has current transformer, reduction voltage circuit and anti-aliasing circuit II, wherein current transformer
Neutral line current is sampled, current transformer is electrically connected through reduction voltage circuit and anti-aliasing circuit II with continuous data processing unit.It is anti-mixed
Folded circuit II has resistance R5, R6 and capacitor C1, C2, C8, and capacitor C1, C2, C8 are connected into a circle, the tie point of capacitor C1, C2
Ground connection, the both ends capacitor C8 connect current transformer both ends through resistance R5, R6 respectively, and the both ends capacitor C8 are also respectively connected at SOC data
Manage chip.Current signal is converted to low current signal by current transformer ratio, this low current signal passes through R3, R4 resistance group
At reduction voltage circuit, the low voltage signal that can be acquired by SOC is converted to according to Ohm's law, low voltage signal is by anti-aliasing
Circuit II, differential signal input the corresponding sampling unit pin of SOC data processing chip with signal acquisition.
Alternating voltage sampling circuit 4 have resistor voltage divider circuit and decoupling circuit, power grid alternating current through resistor voltage divider circuit,
Decoupling circuit is electrically connected with the continuous data processing unit.Voltage sample is resistance decompression principle, and alternating voltage passes through resistance
The resistor voltage divider circuit that R12, R13, R14, R15, R16 and R10 are composed in series, decompression by SOC data processing chip at can be adopted
The low voltage signal of sample.Resistance R9 in this example, R10, capacitor C5, C6 form decoupling circuit and inhibit common-mode signal anti-interference.
Power supply circuit 5, which has, in the present embodiment works normally power supply circuit and single-line operation power supply circuit, wherein normal work
It is steady through lowering and stabilizing blood pressure rectification circuit and low pressure with lowering and stabilizing blood pressure rectification circuit and low pressure voltage stabilizing chip U1, power grid to make power supply circuit
Pressure chip U1 is electrically connected with continuous data processing unit.Lowering and stabilizing blood pressure rectification circuit includes step-down rectifying circuit and voltage regulator circuit,
Wherein be connected to piezoresistor RT1 between step-down rectifying circuit power grid firewire and zero curve, firewire successively connect diode D12 anode and
The tie point of diode D11 anode, firewire and diode D12 are grounded；Zero curve is divided into two-way after capacitor C9, resistance R23, all the way
Diode D9 anode is connect, diode D9 cathode is connected with diode D11 cathode, and another way connects the base of triode Q1 through resistance R26
Pole, triode Q1 grounded collector, triode Q1 transmitter connect the connection of diode D12 Yu diode D11 through electrolytic capacitor E1
Point, triode Q1 transmitter connect diode D10 anode, the tie point of diode D10 cathode connecting resistance R23 and triode Q1；
Voltage regulator circuit is made of zener diode ZD2, ZD3, ZD4 and electrolytic capacitor E4.
Single-line operation power supply circuit has power transformer, and (zero curve, firewire pass through power transformer primary side iron together
Core), pressure stabilizing rectification circuit and low pressure voltage stabilizing chip U1, power grid is through power transformer, pressure stabilizing rectification circuit and low pressure voltage stabilizing chip
U1 is electrically connected with continuous data processing unit, and wherein pressure stabilizing rectification circuit has patch rectifier bridge ZD1, resistance R21 and pressure stabilizing electricity
Road.
Normal operating conditions (i.e. zero firewire normally accesses): power grid alternating current directly (network label: N, L) is steady by decompression
After repoussage flow network, direct current VHH is exported, direct current VHH is by low pressure voltage stabilizing chip UI (LDO) pressure stabilizing at SOC data processing
Chip operating voltage VCC, for driving entire continuous data processing unit to work, SOC data processing chip at this time is in just
Normal working condition.
Single-line operation state (only has zero curve or only firewire accesses): power grid alternating current incudes via power transformer
(network label: R or B) low-voltage AC is exported, using patch rectifier bridge ZD1, resistance R21 and zener diode ZD2, ZD3,
After the pressure stabilizing commutated network of ZD4, electrolytic capacitor E4 composition, direct current VHH is exported, direct current VHH passes through low pressure voltage stabilizing chip UI
(LDO) pressure stabilizing is at SOC data processing chip operating voltage VCC, for driving entire continuous data processing unit to work, at this time
SOC data processing chip is in low-power consumption working condition.
Fig. 2 is the flow chart of single-phase single line metering method in the present embodiment.The metering method of this example is as follows:
S01, cut-in voltage sampling, sample grid ac voltage by alternating voltage sampling circuit 4；
S02, the size for judging comparison voltage sampled value and single line metering threshold values, if voltage sample value is less than or equal to single line meter
Amount threshold values then enters step S03, on the contrary then enter step S04；
S03, single line quantitative model close voltage sample, sample firewire electric current or neutral line current, and according to firewire or zero curve
Current sampling data measure electricity consumption；
S031, voltage sample is closed to save power consumption；
S032, firewire current sample (process icon is shown as circuit A current sample) is opened, passes through firewire current sampling circuit
2 sampling firewire electric currents；
S033, judgement compare size (the starting metering threshold values a: electric current of firewire current sampling data and starting metering threshold values
Signal is generally dependent on the rated output of power transformer in power supply circuit 5, such as 0.5A, and band carries 1K Ω, and voltage 3V etc. is lower than
What power transformer exported when this threshold values can not be such that system operates normally), if firewire current sampling data is greater than starting metering threshold values
S034 is then entered step, S035 is otherwise entered step；
S034, according to firewire current sampling data scaled voltage metering (have current sample component manganese copper diverter at firewire,
Current divider is mainly a constant resistance (such as 180 micro-ohms), and according to Ohm's law U=IR, voltage is equal to electric current and resistance
Product is calculated), firewire current sample is closed, S038 is entered step；
S035, firewire current sample is closed, opens neutral line current sampling, zero curve is sampled by neutral line current sample circuit 3
Electric current；
S036, judgement compare the size of neutral line current sampled value and starting metering threshold values, if neutral line current sampled value is greater than
Starting metering threshold values then enters step S037, otherwise return step S01；
S037, it is measured according to neutral line current sampled value scaled voltage, closes neutral line current sampling, enter step S038；
S038, processing electrical energy pulse, electrical energy measurement, return step S01.
S04, normal quantitative model measure electricity consumption according to voltage sample value.
The key for judging single line quantitative model and normal quantitative model is whether there is or not voltage sampling signal, and monofilar mode is not handed over
Voltage sampling signal is flowed, voltage sample value is zero.Certainly, neutral line current sampling can be first opened in single line quantitative model, be then turned on
Firewire current sample, principle are identical as this example.
This example is in single line quantitative model, and the same time, only cut-in voltage sampled and fire, three tunnel of neutral line current sample circuit
In all the way, power consumption is reduced with this.When selecting quantitative model, measured always by the measurement channel of last time selection, this
Default circuit A metering when being selected for the first time in example.Once selecting circuit A metering, and circuit A electric current is consistently greater than and starts metering valve
Value then selects circuit A as measurement loop, until circuit A electric current is less than starting metering threshold values always.If poising circuit A metering,
And it has been greater than starting metering threshold values, even if circuit B electric current is greater than circuit A and will not switch over.
Claims (8)
1. a kind of single-phase single line metering circuit, it is characterised in that: there is metering and data processing circuit and power supply circuit (5),
In, the metering and data processing circuit include sample circuit and continuous data processing unit (1)；
Sample circuit, including neutral line current sample circuit (3), firewire current sampling circuit (2) and alternating voltage sampling circuit
(4)；
Continuous data processing unit (1) is adopted with neutral line current sample circuit (3), firewire current sampling circuit (2) and alternating voltage
Sample circuit (4) electrical connection；
Power supply circuit (5), DC output end are electrically connected with the continuous data processing unit (1), single for continuous data processing
First (1) power supply；Including working normally power supply circuit and single-line operation power supply circuit, wherein
Power supply circuit is worked normally, is worked when power grid operates normally, there is lowering and stabilizing blood pressure rectification circuit and low pressure voltage stabilizing chip
U1, power grid export direct current after lowering and stabilizing blood pressure rectification circuit and low pressure voltage stabilizing chip U1；
Single-line operation power supply circuit works in the operation of power grid single line, has power transformer, pressure stabilizing rectification circuit and low pressure steady
Chip U1 is pressed, power grid exports direct current after power transformer, pressure stabilizing rectification circuit and low pressure voltage stabilizing chip U1.
2. a kind of single-phase single line metering circuit according to claim 1, it is characterised in that: the lowering and stabilizing blood pressure rectification circuit
Including step-down rectifying circuit and voltage regulator circuit, step-down rectifying circuit has triode Q1, diode D9, D10, D11, D12 and electricity
Hold C9.
3. a kind of single-phase single line metering circuit according to claim 2, it is characterised in that: electric in the step-down rectifying circuit
Net firewire successively connects diode D12 anode and diode D11 anode, the tie point ground connection of firewire and diode D12；Zero curve is through electricity
It is divided into two-way after holding C9, resistance R23, connects diode D9 anode all the way, diode D9 cathode is connected with diode D11 cathode, separately
The base stage of triode Q1 is connect through resistance R26 all the way, triode Q1 grounded collector, triode Q1 emitter is through electrolytic capacitor E1
The tie point of diode D12 Yu diode D11 are connect, triode Q1 transmitter connects diode D10 anode, diode D10 cathode
The tie point of connecting resistance R23 and triode Q1.
4. a kind of single-phase single line metering circuit according to claim 1, it is characterised in that: the firewire current sampling circuit
(2) there is manganese copper diverter and anti-aliasing circuit I, wherein manganese copper diverter samples firewire electric current, and manganese copper diverter is through anti-aliasing
Circuit I is electrically connected with the continuous data processing unit (1).
5. a kind of single-phase single line metering circuit according to claim 1, it is characterised in that: the neutral line current sample circuit
(3) there is current transformer, reduction voltage circuit and anti-aliasing circuit II, wherein current transformer samples neutral line current, Current Mutual Inductance
Device is electrically connected through reduction voltage circuit and anti-aliasing circuit II with the continuous data processing unit (1).
6. a kind of single-phase single line metering circuit according to claim 1, it is characterised in that: the alternating voltage sampling circuit
(4) there is resistor voltage divider circuit and decoupling circuit, power grid alternating current is through resistor voltage divider circuit, decoupling circuit and the continuous data
Processing unit (1) electrical connection.
7. a kind of single-phase single line metering method, it is characterised in that steps are as follows:
S01, cut-in voltage sampling, sample grid ac voltage；
S02, the size for judging comparison voltage sampled value and single line metering threshold values, if voltage sample value is less than or equal to single line metering valve
Value then enters step S03, on the contrary then enter step S04；
S03, single line quantitative model,
S031, voltage sample is closed；
S032, firewire current sample is opened；
S033, judgement compare the size of firewire current sampling data and starting metering threshold values, if firewire current sampling data is greater than starting
Metering threshold values then enters step S034, otherwise enters step S035；
S034, it is measured according to firewire current sampling data scaled voltage, closes firewire current sample, enter step S038；
S035, firewire current sample is closed, opens neutral line current sampling；
S036, judgement compare the size of neutral line current sampled value and starting metering threshold values, if neutral line current sampled value is greater than starting
Metering threshold values then enters step S037, otherwise return step S01；
S037, it is measured according to neutral line current sampled value scaled voltage, closes neutral line current sampling, enter step S038；
S038, processing electrical energy pulse, electrical energy measurement, return step S01；
S04, normal quantitative model measure electricity consumption according to voltage sample value.
8. a kind of single-phase single line metering method, it is characterised in that steps are as follows:
S01, cut-in voltage sampling, sample grid ac voltage；
S02, the size for judging comparison voltage sampled value and single line metering threshold values, if voltage sample value is less than or equal to single line metering valve
Value then enters step S03, on the contrary then enter step S04；
S03, single line quantitative model,
S031, voltage sample is closed；
S032, neutral line current sampling is opened；
S033, judgement compare the size of neutral line current sampled value and starting metering threshold values, if neutral line current sampled value is greater than starting
Metering threshold values then enters step S034, otherwise enters step S035；
S034, it is measured according to neutral line current sampled value scaled voltage, closes neutral line current sampling, enter step S038；
S035, neutral line current sampling is closed, opens firewire current sample；
S036, judgement compare the size of firewire current sampling data and starting metering threshold values, if firewire current sampling data is greater than starting
Metering threshold values then enters step S037, otherwise return step S01；
S037, it is measured according to firewire current sampling data scaled voltage, closes firewire current sample, enter step S038；
S038, processing electrical energy pulse, electrical energy measurement, return step S01；
S04, normal quantitative model measure electricity consumption according to voltage sample value.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610246655.6A CN105932766B (en) | 2016-04-18 | 2016-04-18 | A power supply circuit, a single-phase single-wire metering circuit and a metering method |
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|---|---|---|---|
| CN201610246655.6A CN105932766B (en) | 2016-04-18 | 2016-04-18 | A power supply circuit, a single-phase single-wire metering circuit and a metering method |
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| CN105932766A CN105932766A (en) | 2016-09-07 |
| CN105932766B true CN105932766B (en) | 2019-04-05 |
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| 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 |
| CN116106623B (en) * | 2023-04-12 | 2023-08-29 | 浙江恒业电子股份有限公司 | Dual-power calculation single-phase electric energy meter and method for non-isolated sampling alternating current |
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| CN103592483A (en) * | 2013-11-04 | 2014-02-19 | 江苏林洋电子股份有限公司 | System and method for maintaining metering function after null line or phase line of electronic watt-hour meter is removed |
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| US8121618B2 (en) * | 2009-10-28 | 2012-02-21 | Digimarc Corporation | Intuitive computing methods and systems |
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| CN103592483A (en) * | 2013-11-04 | 2014-02-19 | 江苏林洋电子股份有限公司 | System and method for maintaining metering function after null line or phase line of electronic watt-hour meter is removed |
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