CN105866485A - Integrated intelligent electricity meter with earth leakage protection function - Google Patents
Integrated intelligent electricity meter with earth leakage protection function Download PDFInfo
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- CN105866485A CN105866485A CN201610273732.7A CN201610273732A CN105866485A CN 105866485 A CN105866485 A CN 105866485A CN 201610273732 A CN201610273732 A CN 201610273732A CN 105866485 A CN105866485 A CN 105866485A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R11/00—Electromechanical arrangements for measuring time integral of electric power or current, e.g. of consumption
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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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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
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- Emergency Protection Circuit Devices (AREA)
Abstract
An integrated intelligent electricity meter with an earth leakage protection function comprises a shell, mechanical parts and circuits. The shell is composed of a base (1) and an upper cover (2). Most of the mechanical parts are installed in the base, a liquid crystal display screen, a button and an indication lamp are arranged on the top face of the shell, and the circuits comprise a power supply circuit (16), a main control chip circuit (19), a communication and control circuit (17), a metering circuit (15) and a sampling circuit (18); single-phase alternating-current 220 V input in the power supply circuit is stepped down through a transformer and then subjected to rectification through a bridge rectifier to become direct current, 5 V voltage is output by a voltage stabilizing block, and a stable 5 V power supply and a stable 12 V power supply are provided for the main control chip circuit, the communication and control circuit, the metering circuit and the sampling circuit. The alternating-current 12 V output end in the power supply circuit is connected to the photocoupling output end of the sampling circuit. The electricity meter can achieve automatic load control and earth leakage protection for electricity users, time and labor are saved, and the electricity meter is safe and efficient.
Description
Technical field
The present invention relates to the integral and intelligent ammeter of a kind of low-voltage distribution and the band creepage protection function in batch meter.
Background technology
In low-voltage distribution cabinet, batch meter, institute's use kilowatt-hour meter can only measure actual output electricity service condition, thus completes
Make power consumption Charging Role, this kind of kilowatt-hour meter can not cut off user power utilization in time once meet subscriber arrearage, can only be by artificial
Operate a switch and can control to continue arrearage electricity consumption in scene, therefore caused some charges not in time, the problem such as arrearage electricity consumption, additionally when with
Electric line occur electric leakage transfinite, phase shortage, phase off zero, disconnected, power load overload, the fault such as short circuit time, confession can not be cut off in time
Electricity loop, it is impossible to avoid causing the generation of the accidents such as person electric shock and electrical fire.Visible, ordinary electric meter also needs and All other routes
Protection coordinative composition of equipments uses, and designs a kind of comprehensive, integral and intelligent ammeter, has certain actual demand.At present, each divide
Body formula, is used alone, and there is the potential safety hazard of the more serious person and electrical equipment, supports the use then auxiliary equipment relatively costly,
Also limited by actual casing installing space, to bringing inconvenience during practical installation and trial.
Till the present, i.e. there is ammeter self-metering function, can really realize again the integral type of route protection function, comprehensive
Type intelligent electric meter not yet comes out, and is therefore actively to coordinate China's new rural village electric network reconstruction, proposes a kind of band creepage protection function
Novel intelligent electric meter is imperative.
Summary of the invention
The technical problem to be solved in the present invention is to provide the integral and intelligent ammeter of a kind of band creepage protection function.
Solve above-mentioned technical problem and adopt the following technical scheme that the integral and intelligent ammeter of this band creepage protection function, bag
Including shell, mechanically and electrically road three part, shell is made up of base and upper cover, base is provided with connecting terminal block, lead-in pile, goes out
Line stake, power board and signal panel, upper cover top surface is provided with LCDs, operation button and communication module；Circuit
Part includes power circuit, main control chip circuit, mechanical part be also arranged in base its end of incoming cables and leading-out terminal respectively with
The magnetic latching relay that lead-in pile and outlet stake connect, the inlet wire side of this magnetic latching relay is provided with copper-manganese sampling component, goes out
Line side passes zero sequence current mutual inductor, upper caping
Face is also equipped with divide-shut brake instruction and anti-electricity-theft assembly；Circuit part also has communication and control circuit, metering circuit, sampling
Circuit and anti-electricity-theft special circuit；In power circuit, single phase ac 220V inputs through transformer pressure-reducing, then bridge heap carries out rectification
Become direct current, export 5V by regulator block, carry for main control chip circuit, communication and control circuit, metering circuit and sample circuit
For stable 5V power supply and 12V power supply；The optocoupler output that the outfan of the exchange 12V in power circuit is connected in sample circuit
End；
Main control chip circuit connects the data input pin of the middle RS485 chip of communication and control circuit, connects communication and controls electricity
The data input pin of road repeat circuit control chip, connects communication and the outfan of control circuit peripheral control, connects communication
With the outfan of DIP switch in control circuit；
Main control chip circuit connects the outfan of metering circuit；
Main control chip circuit connects the outfan of the electric leakage sampling of sample circuit, connects synchronization signal detection defeated of sample circuit
Go out end.
In described power circuit, single-phase alternating current LA, LN are depressured to exchange 12V respectively through transformator T1, exchange 12V
Being connected to the outfan of the optocoupler IC5 of sample circuit, exchange 12V is after TVS pipe D1 is protected simultaneously, then through gap bridge heap
BRG1 carries out rectification and becomes the power supply that direct current 12V, direct current 12V are connected to the Control chip IC 2 of communication and control circuit
Holding, direct current 12V electric capacity C1 the most after filtering simultaneously, C2, C3, C5 are connected to regulator block U1 input, and regulator block U1 exports direct current
5V electric capacity C6 after filtering, C7 are connected to metering circuit, communication and control circuit, sample circuit and main control chip circuit；
Described communication and control circuit are inputted by Control chip IC 2, RS485 communication chip IC3, external control signal
With DIP switch S1 composition, the outfan of Control chip is connected to magnetic protective relay, Control chip IC 2
Input is connected to the I/O port of the main control chip U4 of main control chip circuit, and the data input pin of RS485 communication chip IC3 is connected to
The UART mouth of the main control chip U4 of main control chip circuit, external signal input terminals is connected to the main control chip U4 of main control chip circuit
I/O port, the outfan of DIP switch S1 is connected to the I/O port of main control chip U4；
Described metering circuit is by three road voltage sampling circuits, three road current sampling circuits and computation chip and interlock circuit group
Becoming, the data output end of computation chip is connected to the I/O port of main control chip U4；
Described sample circuit is by leaking electricity sample circuit and synchronous signal acquisition circuit forms, amplifier IC4 of electric leakage sample circuit
Output be connected to the AD3 mouth of main control chip U4, the output of synchronous signal acquisition circuit is connected to the I/O port of main control chip U4；
Described main control chip main circuit to be made up of main control chip MC9S08AC and crystal oscillating circuit, main control chip MC9S08AC's
Crystal oscillator input pin is connected to the AD mouth of crystal oscillator JZ, main control chip MC9S08AC and is connected to the sampling output pin of sample circuit, master control
The I/O port of chip MC9S08AC is connected to the input of metering circuit and controls foot, the I/O port communication of main control chip MC9S08AC and control
The input pin of the Control chip of circuit, the UART mouth of main control chip MC9S08AC is connected in communication and control circuit
The input pin of RS485 chip, the I/O port double hit of main control chip MC9S08AC to communication and control circuit peripheral signal input part,
The outfan of the DIP switch S1 that the I/O port of main control chip MC9S08AC is connected in communication and control circuit.
The invention has the beneficial effects as follows the integral and intelligent ammeter using this band creepage protection function, power consumption can be realized
Management through quantification, it is not necessary to come to erecting bed manual operation personally, can be achieved with monitoring electrical network practical operation situation, particularly circuit in real time
Shield during fault, cut off electricity consumption loop in time, it is to avoid cause the generation of the accidents such as person electric shock and electrical fire.Pass through
Ammeter management through quantification device and circuit (electrically) protection device are effectively integrated, power grid construction can be realized comprehensively and unitize, advise
Generalized, more promotes electrical network centralized management, actively improves rural electricity consumption management level.Use this comprehensive ammeter both can be real
Existing original management through quantification function, can have concurrently again electric leakage transfinite, phase shortage, phase off zero, disconnected, power load overload, short circuit etc. automatically
Defencive function, it is also possible to realize remotely controlling and having expense control function, when meeting emergency, management personnel just need not be in the action
Can be easily accomplished and cut electricity and power transmission work, save time, save labor, safety, efficiency height.
Accompanying drawing explanation
Fig. 1 is the integral and intelligent ammeter contour structures axonometric chart of this band creepage protection function.
Fig. 2 is the integral and intelligent ammeter understructure top view of this band creepage protection function.
Fig. 3 is that the integral and intelligent ammeter of this band creepage protection function decomposes scheme of installation.
Fig. 4 is the circuit block diagram of the integral and intelligent ammeter of this band creepage protection function.
Fig. 5 is the electrical schematic diagram of the integral and intelligent ammeter of this band creepage protection function.
Detailed description of the invention
The present invention below in conjunction with embodiment and is described in detail referring to the drawings: shell and mechanical part see Fig. 13, circuit
Part sees Fig. 45, the integral and intelligent ammeter of a kind of band creepage protection function, including shell, mechanically and electrically road three part,
Shell is made up of base and upper cover, and base is provided with connecting terminal block, lead-in pile, outlet stake, power board and signal control
Making sheet, upper cover top surface is provided with LCDs, operation button and communication module；Circuit part includes power circuit, master control core
Sheet circuit, is characterized in that mechanical part is also arranged on base its end of incoming cables interior and connects with lead-in pile and outlet stake respectively with leading-out terminal
The magnetic latching relay connect, the inlet wire side of this magnetic latching relay is provided with copper-manganese sampling component, and outgoing line side passes zero-sequence current
Transformer, upper cover top surface is also equipped with divide-shut brake display lamp；Circuit part also has communication and control circuit, metering circuit and sampling
Circuit；Power circuit single phase ac 220V inputs through transformer pressure-reducing, then bridge heap carries out rectification and becomes direct current, passes through regulator block
Output 5V, provides stable 5V power supply and 12V for main control chip circuit, communication and control circuit, metering circuit and sample circuit
Power supply；The outfan of the exchange 12V in power circuit is connected to the optocoupler outfan of sample circuit；
Main control chip circuit connects the data input pin of the middle RS485 chip of communication and control circuit, connects communication and controls electricity
The data input pin of road Control chip, connects the outfan of communication and control circuit external control, connects communication and control
The outfan of circuit DIP processed switch；
Main control chip circuit connects metering circuit outfan；
Main control chip circuit connects the outfan of the electric leakage sampling of sample circuit, connects synchronization signal detection defeated of sample circuit
Go out end.
Fig. 4 gives circuit block diagram and the annexation each other of the present invention, and other each electricity is responsible for by power circuit
The power supply supply on road, main control chip circuit is responsible for the control of other circuit, is communicated and control circuit is responsible for equipment and extraneous connection
Being and the control of external circuit that the collection of signal is responsible for by sample circuit, metering circuit is responsible for the sampling of load and is calculated.
In the communication of Fig. 5 and control circuit 17, it is the hardware composition of equipment and external information intercommunication and control relay, logical
Letter and control circuit 17 are made up of Control chip IC 2, RS485 chip IC 3, external signal circuit and DIP switch S1,
Between the annexation of components and parts and other circuit be: the data input pin of Control chip IC 2 is connected to master control core
The E2 of the I/O port of the MC9S08AC of sheet circuit 19, the data input pin of E3, RS485 is connected to the UART mouth of MC9S08AC, R52,
R53 and R54 pull-up is connected to
The outfan of the data of P1.18 P1.22, RS485 in the I/O port of LPC1766 is through the pull-up of R18 and R18 drop-down
Being connected to external interface, external signal output is through the I/O port of resistance R2 pull-up and electric capacity C12 grounding connection to MC9S08AC
C3, the outfan of DIP switch S1 is connected to E4, the E5 of the I/O port of MC9S08AC through resistance R30, R31, R32 and R33 pull-up,
E6 and E7, other end also receives GND.
In Fig. 5 power circuit 16, single-phase alternating current LA, LN carry out blood pressure lowering through transformator T1 and become exchange 12V, then pass through
TVS pipe D1, is connected to the outfan of the optocoupler IC5 of sample circuit 18, is connected to bridge heap BRG1, the output of bridge heap BRG1 simultaneously
End direct current 12V is connected to communicate and the power supply input pin of control circuit IC2, direct current 12V electric capacity C1, C2, C3 after filtering simultaneously,
C5 is connected to the input of regulator block U1, and the outfan of regulator block U1 electric capacity C6 after filtering, C7 are connected to communication and control electricity
Road 17, indicator light circuit, sample circuit 18 and main control chip circuit 19.
The metering circuit 15 of Fig. 5 is the hardware composition of the voltage x current sampling needed for calculated load, metering circuit 15
Be made up of voltage sampling circuit, current sampling circuit and sampling computing chip and peripheral circuit, components and parts between them and its
He the annexation of circuit is: three road voltage signals respectively through resistance R51, R52, R53, R54, R64, R65, R66, R67,
R77, R78, R79 and R70, then through switch SW9, SW22 and SW35, pass through by AC1, AC2, AR1, BC1, BC2, BR1, CC1,
The RC filtering of CC2 and CR1 composition is connected to the voltage sample input pin of U6, three road current signals respectively through R57, R58,
AR50, AR51, C31, C32, R59, R60, BR50, BR51, C22, C33, R61, R62, CR50, CR51, C15 and C16 are connected to
The current sample input pin of U6, the output pin of U6 is connected to main control chip circuit.
The collection of sampled signal is mainly responsible for by the sample circuit 18 of Fig. 5, is mainly adopted by electric leakage Acquisition Circuit and synchronizing signal
Collector forms, and components and parts annexation and the annexation of external circuit between them be: electric leakage Acquisition Circuit original
Signal is through resistance R20, then through diode D3, D4, then enters the input of amplifier IC4 through resistance R21 and R27, passes through
It is connected to the AD3 of the AD mouth of MC9S08AC after the amplification of amplifier IC4 through resistance R23, synchronous signal acquisition circuit exchanges 12V warp
Crossing resistance R5, diode D2, resistance R4, C11 are connected to the base stage of audion QP1, and the emitter stage of audion QP1 is through resistance R3
It is connected to the I/O port F5 of MC9S08AC.
In the main control chip circuit 19 of Fig. 5, main control chip is the Based Intelligent Control of whole equipment
Brain, determines that whole equipment can be according to the requirement intelligent operation of user.Therefore the selection of main control chip is extremely important.This
Equipment uses the MC9S08AC of leading Freescale company of microprocessor manufacturing company, and Freescale company releases
MC9S08AC Series MCU is the member of high-performance HCS08 series 8-bit microprocessor unit.The single-chip microcomputer of this series is by one
8 and 32 device compositions to pin compatibility, are the 3rd series of products of Flexis family device.Flexis series controls
Device is the junction point of Freescale controller association, makes 8 to become a reality with 32 compatibility.MC9S08AC series HCS08
Microprocessor requires highly integrated and low-power consumption Embedded Application for processing.The operation frequency of MC9S08AC Series of MCU
Rate is up to 40MHz.The peripheral component of MC9S08AC Series of MCU comprises the flash memorizer of up to 60KB, 2KB
Data storage, two UART, SPI interfaces, two IIC interfaces, 10 ADC of 16 passages, motor control PWM, three lead to
With intervalometer, the general PWM of 8 outputs and the general purpose I/O pin of up to 54.The annexation of MC9S08AC and crystal oscillator is:
The crystal oscillator input pin XTAL of MC9S08AC connects crystal oscillator, BKGD and the RST foot double hit of MC9S08AC is to program burn writing circuit, master control
The annexation of chip circuit 19 and other circuit is: the AD mouth AD0 of MC9S08AC, AD1, AD2 are connected respectively to sample circuit
The electric leakage sampling that the AD mouth AD3 of R15, R16 and the R17 of the current sampling circuit in 18, MC9S08AC is connected in sample circuit 4
The F5 of the I/O port of the R23 of circuit, MC9S08AC is connected to the R3 of the synchronizing signal sample circuit of sample circuit 18, MC9S08AC's
The A0 of I/O port, A1, G0, G1, G2 be connected respectively to R13, R8, R26, R25 and the R12 of indicator light circuit 3, the I/O port of MC9S08AC
E2, E3 be connected respectively to the control input of IC2 of communication and control circuit 17, the UART mouth of MC9S08AC is connected to communication
With the data input pin of the RS485 of control circuit 17, the C2 of the I/O port of MC9S08AC is connected to outside communication and control circuit 17
Meeting the C12 of signal output part, the E4 of the I/O port of MC9S08AC, E5, E6, E7 are connected respectively to the DIP of communication and control circuit 17
Outfan R30, R31, R32 and the R33 of switch S1.
The model selecting electronic devices and components in the present embodiment is as follows:
One, resistance class device: R1 1M, R2 10K, R15 10, R16 10, R17 10, R20 100, R23 100, R7 510, R8
510, R12 510, R13 510, R25 510, R6 1K, R9 1K, R11 1K, R29 1K, R36 1K, R14 4.7K, R48
4.7K, R5 10K, R3 10K, R18 10K, R19 10K, R21 10K, R30 10K, R31 10K, R32 10K, R33 10K,
R34 10K, R35 10K, R37 10K, R4 15K, R22 100K, R51 300K, R52 300K, R53 150K, R54 150K,
R64 300K, R65 300K, R66 150K, R67 150K, R77 300K, R78 300K, R79 150K, R70 150K, AR1
1K, BR1 1K, CR1 1K, R59 1K, R57 1K, R61 1K, AR50 1, AR51 0.47, BR50 1, BR51 0.47, CR50
1, CR51 0.47, R47 1K
Two, capacitance kind device: C, 8 24PF, C9 24PF, C15 4.7u, C5 104, C7 104, C10 104, C11 104, C12
104, C13 104, C14 104, C15 104, C17 104, C6 10u, C31 33nF, C32 33nF, C33 33nF, C32
33nF, C22 33nF, C15 33nF, C16 33nF, C10 10u, C26 100nF, C28 22pF, C29 22pF, AC1 22
NF, AC2 22 nF, BC1 22 nF, BC1 22 nF, CC1 22 nF, CC1 22 nF
Three, audion class device: QP1 9013, QP2 9013, QP3 9013, QP4 9013, QP5 9013, QP6 9013
Four, diode-like device: D1 SMBJ18CA, D2 IN4148, D3 IN4148, D14 IN4148, LED1 green emitting
Diode, LED2 red light emitting diodes, LED3 red light emitting diodes, LED4 red light emitting diodes, LED5 is red
Light emitting diode, LED6 red light emitting diodes,
Five, integrated components and parts: U1 78L05, IC1 MC9S08AC, IC2 BL8023C, IC3 SN75176, IC4 LM258, U6
ADE7752
Six, other: T1 AC transformer, BRG1 DBS107, JZ crystal oscillator 4M, S1 DIP switch
For refinement, the invention provides the integral and intelligent ammeter of a kind of band creepage protection function, solve spatial load forecasting
Problem, then there is provided the earth leakage protective function of a kind of band, additionally provide the function of a kind of remote controlled divide-shut brake.
Claims (2)
1. an integral and intelligent ammeter for band creepage protection function, including shell, mechanically and electrically road three part, shell is by base
(1) form with upper cover (2), base is provided with connecting terminal block (7), lead-in pile (9), outlet stake (8), power board (13)
With signal panel (14), upper cover top surface is provided with LCDs (3), operation button (4) and communication module (5)；Circuit part
Divide and include power circuit (16), main control chip circuit (19), it is characterized in that mechanical part is also arranged on its end of incoming cables in base
The magnetic latching relay (12) being connected with lead-in pile (9) and outlet stake (8) respectively with leading-out terminal, the inlet wire of this magnetic latching relay
Side is provided with copper-manganese sampling component (11), and outgoing line side passes zero sequence current mutual inductor (10), and upper cover top surface is also equipped with divide-shut brake
Instruction (6) and anti-electricity-theft assembly；Circuit part also has communication and control circuit (17), metering circuit (15), sample circuit (18)
With anti-electricity-theft special circuit；Power circuit (16) single phase ac 220V inputs through transformer pressure-reducing, then bridge heap carries out rectification change
Become direct current, by regulator block export 5V, for main control chip circuit (19), communication and control circuit (17), metering circuit (15) and
Sample circuit (18) provides stable 5V power supply and 12V power supply；The outfan of the exchange 12V in power circuit (16) is connected to adopt
The optocoupler outfan of sample circuit (18)；
Main control chip circuit (19) connects the data input pin of the middle RS485 chip of communication and control circuit (18), connects communication
With the data input pin of control circuit (17) Control chip, connect the output of communication and control circuit (17) external control
End, connects communication and the outfan of control circuit (17) DIP switch；
Main control chip circuit (19) connects metering circuit (15) outfan；
Main control chip circuit (19) connects the outfan of the electric leakage sampling of sample circuit (18), connects the synchronization of sample circuit (18)
The outfan of signal detection.
2. the integral and intelligent ammeter of band creepage protection function as claimed in claim 1, is characterized in that described power circuit
(16), in, single-phase alternating current LA, LN are depressured to exchange 12V, exchange 12V respectively through transformator T1 and are connected to sample circuit (18)
The outfan of optocoupler IC5, exchange 12V is after TVS pipe D1 is protected simultaneously, then carries out rectification through gap bridge heap BRG1 and become
Direct current 12V, direct current 12V are connected to the power end of the Control chip IC 2 of communication and control circuit (17), direct current simultaneously
12V electric capacity C1 the most after filtering, C2, C3, C5 be connected to regulator block U1 input, and regulator block U1 output direct current 5V is the most electric
Hold C6, C7 and be connected to metering circuit (15), communication and control circuit (17), sample circuit (18) and main control chip circuit (19)；
Described communication and control circuit (17) are by Control chip IC 2, RS485 communication chip IC3, external control signal
Input and DIP switch S1 composition, the outfan of Control chip is connected to magnetic protective relay, Control chip
The input of IC2 is connected to the I/O port of the main control chip U4 of main control chip circuit (19), and the data of RS485 communication chip IC3 are defeated
Entering the UART mouth that end is connected to the main control chip U4 of main control chip circuit (19), external signal input terminals is connected to main control chip electricity
The I/O port of the main control chip U4 on road (19), the outfan of DIP switch S1 is connected to the I/O port of main control chip U4；
Described metering circuit (15) is by three road voltage sampling circuits, three road current sampling circuits and computation chip and interlock circuit
Composition, the data output end of computation chip is connected to the I/O port of main control chip U4；
Described sample circuit (18) is made up of electric leakage sample circuit and synchronous signal acquisition circuit, the amplifier of electric leakage sample circuit
The output of IC4 is connected to the AD3 mouth of main control chip U4, and the output of synchronous signal acquisition circuit is connected to the IO of main control chip U4
Mouthful；
Described main control chip circuit (19) is mainly made up of main control chip MC9S08AC and crystal oscillating circuit, main control chip
The crystal oscillator input pin of MC9S08AC is connected to the AD mouth of crystal oscillator JZ, main control chip MC9S08AC and is connected to adopting of sample circuit (18)
Sample output pin, the I/O port of main control chip MC9S08AC is connected to the input of metering circuit (15) and controls foot, main control chip
The input pin of the Control chip of the I/O port communication of MC9S08AC and control circuit (17), main control chip MC9S08AC's
UART mouth is connected to the input pin of the RS485 chip in communication and control circuit (17), and the I/O port of main control chip MC9S08AC is even
Hitting communication and control circuit (17) peripheral signal input part, the I/O port of main control chip MC9S08AC is connected to communication and controls
The outfan of the DIP switch S1 in circuit (17).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201610273732.7A CN105866485A (en) | 2016-04-28 | 2016-04-28 | Integrated intelligent electricity meter with earth leakage protection function |
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| CN201610273732.7A CN105866485A (en) | 2016-04-28 | 2016-04-28 | Integrated intelligent electricity meter with earth leakage protection function |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107257126A (en) * | 2017-05-15 | 2017-10-17 | 华立科技股份有限公司 | Can protective relay electric energy meter high current trip method |
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| CN107257126A (en) * | 2017-05-15 | 2017-10-17 | 华立科技股份有限公司 | Can protective relay electric energy meter high current trip method |
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