CN2247818Y - Three phase intelligence electric energy meter - Google Patents
Three phase intelligence electric energy meter Download PDFInfo
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- CN2247818Y CN2247818Y CN 95219348 CN95219348U CN2247818Y CN 2247818 Y CN2247818 Y CN 2247818Y CN 95219348 CN95219348 CN 95219348 CN 95219348 U CN95219348 U CN 95219348U CN 2247818 Y CN2247818 Y CN 2247818Y
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Abstract
The utility model relates to a three-phase intelligent electric energy meter, which is composed of a meter casing, a character wheel, a liquid crystal display and a testing metering circuit system, wherein, an insertion opening used for the insertion of an IC intelligent card is arranged on a panel of the meter casing; the testing metering circuit system is composed of a sampling unit, a time-sharing processing unit, a phase detecting circuit unit, a multiplier, an A/D converting unit, a CPU, a frequency dividing unit, a stepping switch and a character wheel; the sampling unit adopts a hall magnetic balance sensor. The three-phase intelligent electric energy meter has the advantages of complete function, high safety, wide response frequency, convenient operation, simple structure of circuits and low cost and is an ideal product for automation and semi-automation management.
Description
The utility model relates to a kind of industrial electric energy table, particularly relates to a kind of three-phase intelligent electric energy meter.
Existing intelligent power table, as the electric energy meter that U.S. GE company, Switzerland Landis base company, German EMH company etc. produces, the acquisition methods of its power factor, reactive power and active power is by detecting and metering active power WR, electric current A and voltage V obtain.Adopt this technical scheme, the measurement metering circuit of electric energy meter is three, the hardware circuit complexity of this feasible table, cost height.
The current sample of electric energy meter is one of gordian technique, and conventional sampling plan has: (1) solenoid, (2) shunt resistance, (3) mutual inductor, (4) magneto sensor (Hall element).These several sampling plans all have weak point, and for example, the shortcoming of solenoid is that precision is not high, and the reliability of its precision is subjected to the influence of mechanical driving device; The greatest drawback of shunt resistance sampling is that forceful electric power and weak electric signal can not be isolated, and is easy to the burning table under impact load; The major defect of current transformer sampling be the phase change importing, export be sampled current value change surpass 1/10 generation when above phase error greatly; The shortcoming of Hall element sampling is to improve the sampling precision of weak signal is very difficult.This shows, further improves and improve the method and the device of the current sample of electric energy meter, and the structure of his-and-hers watches and the raising of performance are vital.
The purpose of this utility model is to provide a kind of three-phase intelligent electric energy meter, and this table function is complete, high precision, high reliability, and response frequency is wide, and hardware configuration is simple, simple operation, cost is low.
Three-phase intelligent electric energy meter of the present utility model comprises watchcase, character wheel, LCD, test and measuring Circuits System, is characterized in being provided with on the panel of watchcase for inserting the insertion mouth that IC-card is used, and inserts a mouthful below deck is housed.Also be provided with on the panel for printing, detecting pulse and the interface of the signal output usefulness of operating a switch.The test and measuring Circuits System is made up of sampling unit, time-division processing unit, phase detecting circuit unit, multiplier, A/D converting unit, CPU, frequency unit, stepper and character wheel.The output terminal of sampling unit is connected with the input end of time-division processing unit, one tunnel output of time-division processing unit is connected with the phase detecting circuit unit, another road output is connected with multiplier, the output terminal of phase detecting circuit unit is connected with CPU, the output terminal of multiplier is connected with the A/D converting unit, and one tunnel output of A/D converting unit is connected with CPU, and another road output is connected with frequency unit, the output of frequency unit is connected with stepper, and stepper drives character wheel and rotates.Sampling unit adopts Hall magnetic balance sensor.
The intelligent electric energy meter of the present utility model has many advantages.It is multiple functional, integrates meritorious, idle, time-sharing measurement and pre paid functionality, is the ideal product of using electricity automation and semi-automatic management.After new table was installed, the input sophistication IC-card of management data was operated very convenient (also available programmable device is from showing last 232 mouthfuls of inputs).After outage, data are stored among the EEPROM never loses.The clock of time-shared charge still can keep operate as normal within cutting off the power supply 10 years continuously.Need not proofread clock again after the outage.This table adopts ear magnetic balance type sensor suddenly, and instrument and electrical network are isolated, and is safe and reliable, the more important thing is the wide response frequency with 0-100KHz, and the electricity consumption of various height, intermediate frequency large-scale electric equipment metering all can be adopted this table in the industrial and mining enterprises.
The utility model has following accompanying drawing:
Fig. 1 three-phase intelligent electric energy meter watchcase panel synoptic diagram
Fig. 2 three-phase intelligent electric energy meter theory diagram
The fundamental diagram of Fig. 3 Hall magnetic balance sensor
Fig. 4 phase detection principle circuit diagram
Fig. 5 master routine logical flow chart
Fig. 5 interrupt routine logical flow chart
Below in conjunction with drawings and Examples the utility model is described in further detail.
Fig. 1 is the panel synoptic diagram of electric energy meter.Among Fig. 1,1 is IC-card insertion mouth.Adopt the programming media of IC smart card, directly to electric energy meter programming and the relevant management data of input, with the hand-hold programmer that replaces trivial operations and easily make mistakes as table.Replace magnetic card electronic money pre-payment with the IC smart card, to improve the reliability and the confidentiality of electronic money.The IC smart card adopts the AT88SC102 chip manufacturing with 16 two secret words of byte.Among Fig. 1,2 is the RS232 mouth, for print, detect pulse, the signal of operating a switch output.Blue look function key 3 and white function key 4 cooperate for resetting, using during the school, when Card Reader and printing.Character wheel 5 is for showing the total electric energy of three-phase, and LCD 6 is for showing every data usefulness.Red led 7 flicker expressions are just in electricity consumption.
Among Fig. 2,8 is sampling unit, and 9 is the time-division processing unit, and 10 is the phase detecting circuit unit, and 11 is multiplier, and 12 is A/D converter, and 13 is character wheel, and 14 is stepper, and 15 is frequency unit, and 16 is CPU.CPU also with liquid crystal display, printing, warning, RS232 mouth and the control linkage of operating a switch.Time-division processing is realized the time sharing sampling of three-phase current, magnitude of voltage by the multi-channel analog switch.Power factor is produced by the phase test module.Active power is changed to CPU through A/D by multiplier and to be carried out peak, paddy, charge when dividing equally and to show.Every month reactive energy is provided according to active energy and power factor calculating by CPU.
The demonstration of this table: the total electric energy of (1) three-phase (the character wheel demonstration, kwh)
(2) each phase realtime power, power factor and active energy (liquid crystal display, w)
(3) mutual inductor ratio (liquid crystal display)
(4) clock (liquid crystal display, h.min)
(5) requirement shows
(6) peak, paddy, ordinary telegram amount show
(7) period shows etc.
This table printout: the maximum monthly plan requirement of (1) day part (kwh, eight periods), (2) day part power overload alarm plan (w), (3) last month peak, paddy, flat each section peak power (w), (4) last month each at the peak, paddy, put down the accumulative total power consumption (kwh) of each section, (5) go up the total active energy of month to date three-phase (kwh) and total reactive energy (kVarh), (6) maximum demand value 15 minutes last months (kwh), (7) date and time (y.m.d.min), (8) can need be provided with and print relevant data by the user.
The monitoring function of this table: (1) voltage monitoring, period maximum demand monitoring.(2) amount of transfiniting is reported to the police automatically and is operated a switch control.The RS232 interface of this table can be networked with microcomputer, printer.
The technical indicator of electric energy meter:
0.5 grade, 1.0 grades, 2.0 grades of precision
Mains frequency: 40Hz-60Hz
Rated voltage: 3 * 220V/380V
Rated current: 3 * 1.5 (6) A, 3 * 2.5 (10) A, 3 * 5 (20) A
Ammeter constant: 16001mP/kwh
Temperature :-10 ℃-45 ℃
Relative humidity :≤95%
Serviceable life: 20 years
Volume: 270mm * 160mm * 120mm
Fig. 3 is the fundamental diagram of Hall magnetic balance sensor.The magnetic field that electric current produced that the principle of work of this sensor is the magnetic field that produced of former limit circuit by a secondary coil compensates, and Hall element is under the condition that detects zero magnetic flux all the time works.This sensor is all succeedd on 1.5 (6), 2.5 (10), 5 (20) three kinds of specification tables of electric energy meter.The electric energy sampling is sampled in 125A-10A, the 0.250A-20A scope at 0.075A-6A, 0, and accuracy value all in 0.5%, has realized carrying out wide region and high-precision measurement with hall device.
Concrete analysis to the electric energy meter phase measurtement shows that only near cos φ=1/2, the metering accuracy at φ angle has the greatest impact to cos φ value cos φ value.When for example the φ angle was near 10 °, as long as the error in dipping at φ angle is no more than 1 °, the change of its cos φ value all in 0.3%, for this reason, had been adopted the simplest phase detecting circuit of structure.Do not ask its accuracy of measuring during design, the stability of onlying demand variable, and to adopting the software filtering technology to compensate error in dipping near 60 ° of the sensitive spots.Its brief principle and circuit structure are: voltage and current signal input AM unit, after amplitude modulation, send into the phase circuit unit, obtain to send into filter unit behind the phasometer value, the φ value is carried out filtering compensation, the output of filter unit is sent CPU after the A/D converting unit.The signal of amplitudes such as electric current, the voltage signal that the purpose of amplitude modulation is will to import before measuring phase angle different amplitudes is modulated into does not wait the phase angle error in dipping that brings to eliminate amplitude.The phase circuit unit: the phase place to two signals is made comparisons, and obtains the phasometer value.Filter unit: it is the gate array chip that has solidified filtering algorithm, and the φ value of phase circuit output is carried out filtering compensation.A/D converting unit: analog to digital conversion.
The algorithm of gate array is the device that phase circuit adopted to be done on the basis of great deal of experiment data, and the state equation of analysis acquisition designs by statistics, and its degree of confidence is more than 98%.
Through experimental verification, this phase detecting module satisfied the requirement of intelligent industrial table metering fully on measuring accuracy, and cost has only dozens of yuan Renminbi.
Fig. 4 is the phase detection principle circuit diagram.The two-way ac voltage signal is through 1N1 (2 pin) and 1N2 (3 pin) input, through LM393 zero passage detection chip, from 5,6 pin output square wave, export from OUT1 and OUT2 through light lotus root TLP521-2 more respectively, two square-wave signals spacing together is the phase differential of two ac voltage signals.
The master routine logical flow chart and the interrupt routine logical flow chart of this electric energy meter are seen Fig. 5 and Fig. 6.
Claims (6)
1. three-phase intelligent electric energy meter, comprise watchcase, character wheel, LCD, the test and measuring Circuits System, it is characterized in that on the panel of watchcase, being provided with for inserting the IC-card insertion mouthful (1) that IC-card is used, insert mouthful (a 1) below deck is housed, also be provided with on the panel for printing, detect the interface (2) of the pulse and the signal of operating a switch output usefulness, the test and measuring Circuits System is by sampling unit (8), time-division processing unit (9), phase detecting circuit unit (10), multiplier (11), A/D converting unit (12), CPU (16), frequency unit (15), stepper (14) and character wheel (13) are formed, the output terminal of sampling unit (8) is connected with the input end of time-division processing unit (9), one tunnel output of time-division processing unit (9) is connected with phase detecting circuit unit (10), another road output is connected with multiplier (11), the output terminal of phase detecting circuit unit (10) is connected with CPU (16), the output terminal of multiplier (11) is connected with A/D converting unit (12), one tunnel output of A/D converting unit (12) is connected with CPU (16), another road output is connected with frequency unit (15), the output of frequency unit (15) is connected with stepper (14), and stepper drives character wheel (13) and rotates.
2. electric energy meter as claimed in claim 1 is characterized in that sampling unit (8) adopts Hall magnetic balance sensor.
3. electric energy meter as claimed in claim 2, it is characterized in that phase detecting circuit unit (10) is made up of AM unit, phase circuit unit, filter unit and A/D converting unit, filter unit is the gate array chip that has solidified filtering algorithm, and the φ value of phase circuit output is carried out filtering compensation.
4, electric energy meter as claimed in claim 3 is characterized in that the IC smart card adopts the AT88SC102 chip manufacturing with 16 two secret words of byte.
5. electric energy meter as claimed in claim 4 is characterized in that time-division processing is realized the time sharing sampling of three-phase current, magnitude of voltage by the multi-channel analog switch.
6. electric energy meter as claimed in claim 5 is characterized in that for printing, detecting pulse and the interface (2) of the signal output usefulness of operating a switch is the RS232 mouth.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 95219348 CN2247818Y (en) | 1995-08-22 | 1995-08-22 | Three phase intelligence electric energy meter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 95219348 CN2247818Y (en) | 1995-08-22 | 1995-08-22 | Three phase intelligence electric energy meter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2247818Y true CN2247818Y (en) | 1997-02-19 |
Family
ID=33867572
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 95219348 Expired - Fee Related CN2247818Y (en) | 1995-08-22 | 1995-08-22 | Three phase intelligence electric energy meter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2247818Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105699764A (en) * | 2016-03-21 | 2016-06-22 | 威胜集团有限公司 | Hall-sensor-based electric energy meter |
| CN106772212A (en) * | 2017-04-06 | 2017-05-31 | 马斌 | The unloaded metering of electric energy meter patrols and examines tester online |
-
1995
- 1995-08-22 CN CN 95219348 patent/CN2247818Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105699764A (en) * | 2016-03-21 | 2016-06-22 | 威胜集团有限公司 | Hall-sensor-based electric energy meter |
| CN106772212A (en) * | 2017-04-06 | 2017-05-31 | 马斌 | The unloaded metering of electric energy meter patrols and examines tester online |
| CN106772212B (en) * | 2017-04-06 | 2023-10-27 | 太原山互科技有限公司 | No-load metering on-line inspection tester for electric energy meter |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |