CN201796082U - Intelligent device for measuring current, voltage and power - Google Patents
Intelligent device for measuring current, voltage and power Download PDFInfo
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- CN201796082U CN201796082U CN200920216755XU CN200920216755U CN201796082U CN 201796082 U CN201796082 U CN 201796082U CN 200920216755X U CN200920216755X U CN 200920216755XU CN 200920216755 U CN200920216755 U CN 200920216755U CN 201796082 U CN201796082 U CN 201796082U
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Abstract
The utility model relates to a monitoring device for electric power quality, which comprises a signal front end circuit, a central processing unit (CPU), an A/D converting circuit, an RS 485 communication circuit, a nonvolatile memory, a high-order filter circuit, a zero passage comparison circuit, a real time clock generation circuit, a crystal oscillator circuit, a liquid crystal display driving circuit and a key control circuit. The signal front end circuit is connected with the A/D converting circuit, and the A/D converting circuit, the nonvolatile memory, the real time clock generation circuit, the liquid crystal display driving circuit and the key control circuit are all connected with the CPU, wherein the A/D converting circuit uses a 14-bit A/D converting chip with high accuracy. The monitoring device for electric power quality uses an acquisition circuit with high performance, the rapid fast fourier transform (FFT) algorithm and advanced technologies of large-screen low-consumption liquid crystal display screen and the like. The intelligent device has the advantages of being novel in conception, compact in structure, high in reliability, timely in communication response, high in measuring accuracy and the like.
Description
Technical field:
The utility model relates to the electric energy quality monitoring technology, is specially adapted to the online in real time monitoring of the power quality parameter of electric system and transmission and distribution networks.
Background technology:
Since the eighties, China day by day payes attention to the quality of power supply, has put into effect multinomial quality of power supply standard successively.Along with the promulgation of electric power law, can the electricity consumption client also begins to pay close attention to power supply department provide qualified electric energy.At present, also be no lack of the problem because of the quality of power supply, offshore company abandons the investment in Chinese somewhere.The domestic for this reason much electricity quality monitoring equipment that occurred successively, but the integrated level that function is many is not high, volume big and troublesome problem is installed, price is also relatively more expensive, and few can not the meeting the demands of function, so to Power Quality Detection a very big difficult problem has been proposed, greatly influenced we production and life use electricity quality.So, a kind of local monitor of our eager needs, integrated level is high, network type electric quality monitoring equipment.
Summary of the invention
In view of existing electric energy quality monitoring technology above shortcomings, the utility model proposes a kind of quality of power supply on-line monitoring device, to monitor, to show power quality parameter on the spot, also can form the real time and on line monitoring network simultaneously by communication network and master server.
A kind ofly be used to measure electric current, the intelligent apparatus of voltage and power, it comprises power module, the signal front end circuit, CPU, the A/D change-over circuit, the RS485 communicating circuit, nonvolatile memory, the high-order filtering circuit, the zero passage comparator circuit, real-time clock generation circuit, crystal-oscillator circuit, control relay circuit, the on off state Acquisition Circuit, liquid crystal display drive circuit and key control circuit, it is characterized in that: signal front end circuit one tunnel outputs to the input end of A/D change-over circuit, another road output is by high-order filtering circuit and zero passage comparator circuit, be input to CPU, A/D change-over circuit output terminal, nonvolatile memory, real-time clock generation circuit, crystal-oscillator circuit, control relay circuit, the RS485 communicating circuit, the on off state Acquisition Circuit, liquid crystal display drive circuit and key control circuit all are connected with CPU.
The utility model is the electric energy quality monitoring device, and it comprises: signal front end circuit, CPU, A/D change-over circuit, RS485 communicating circuit, nonvolatile memory, high-order filtering circuit, zero passage comparator circuit, real-time clock generation circuit, crystal-oscillator circuit, liquid crystal display drive circuit and key control circuit.The signal front end circuit is connected with the A/D change-over circuit, and A/D change-over circuit, nonvolatile memory, real-time clock generation circuit, liquid crystal display drive circuit and key control circuit all are connected with CPU.Wherein the A/D change-over circuit adopts 14 A/D conversion chips of high precision.
The signal front end circuit all is treated to the three-phase current voltage signal voltage signal of 1V-2.4V, part signal is converted to 14 position digital signals that CPU can use by the A/D change-over circuit, another part signal (A phase voltage signal) is by high-order filtering circuit and zero passage comparator circuit, with the voltage signal of A phase cut into the square-wave signal about 50HZ triggering the CPU frequency measurement, this signal triggering be the interruption 0 of CPU.
Jumbo nonvolatile memory is used for storing the data that need memory, for example significant datas such as device address, communication baud rate, current/voltage no-load voltage ratio, electric degree.What real-time clock generating circuit adopted is high accuracy clock generation chip, and CPU scans clock chip in real time, to upgrade the time register of CPU inside.Nonvolatile memory and real-time clock generation chip all are to be connected with CPU and to communicate by letter by (lNTER-IC universal serial bus) IIC communication interface.
This electric energy quality monitoring device adopts high performance Acquisition Circuit, fft algorithm efficiently, the advanced technologies such as liquid crystal display of giant-screen low-power consumption.This device is novel, compact conformation, and the reliability height, communication response is instant, characteristics such as measuring accuracy height.
This apparatus structure compactness, the integrated level height.The miniature precision current mutual inductor that the inner current transformer that adopts adopts, current mode punching mutual inductor.Voltage acquisition partly adopts the electric resistance partial pressure mode to gather, and what resistance adopted is glass glaze resistance, the characteristics of this resistance be high pressure resistant, absorb surging signal etc., improved the reliability of voltage acquisition greatly.
Signal through top Acquisition Circuit collects enters into A/D converter, enters CPU and handles computing.
This device can be real-time power quality parameter such as monitoring three-phase current signal, three-phase voltage signal, leakage current, each phase active power, three phases active power, each phase reactive power, three phase reactive power, each phase applied power, three-phase applied power, each phase power factor, three-phase activity coefficient, A phase frequency, three-phase active electrical degree, the idle electric degree of three-phase, real-time clock.
This device also has communication port, in actual applications, can adopt many table apparatus, one station server, just can form a LAN (Local Area Network), the power quality parameter of each device of statistics that server can be real-time, and can carry out data sharing with the equipment of other networks.
Description of drawings
Fig. 1 is whole hardware structure block diagram
Fig. 2 is the terminal connection diagram in the 10KV application
Fig. 3 is the terminal connection diagram in the low pressure applications
Specific embodiment
This device mainly contains power module, signal front end circuit, CPU, A/D change-over circuit, RS485 communicating circuit, nonvolatile memory, high-order filtering circuit, zero passage comparator circuit, real-time clock generation circuit, crystal-oscillator circuit, liquid crystal display drive circuit and key control circuit and forms.Wherein the operating voltage of power module is 100V-260V, and rated power is 2.5 watts, and exports two groups of 5V power supplys, and one the tunnel specially for communicating circuit provides working power, and another road provides working power for other circuit.
But voltage signal is converted into milliampere measuring-signal of level through the resistor voltage divider circuit of device interior, the signal entering signal front end circuit that is attenuated, pass through the processing and amplifying of operational amplifier and the Filtering Processing of low-pass filter here, the high frequency interference part in the measured signal is here by filtering.
But current signal is converted into milliampere measuring-signal of level through the precision current mutual inductor of device interior, the signal entering signal front end circuit that is attenuated, pass through the processing and amplifying of operational amplifier and the Filtering Processing of low-pass filter here, the high frequency interference part in the measured signal is here by filtering.
Signal one tunnel by filtering enters the A/D change-over circuit, CPU gathers the data of A/D change-over circuit output by timer, rule is set satisfies sampling thheorem of timer, frequency acquisition is greater than 2 times signal frequency, collected data are handled through the inside of CPU, are the further frequency domain data of computing through FFT (fast fourier algorithm) with signal decomposition.The sine voltage signal copped wave about with former 50HZ is the square-wave signal of same frequency through high-order filtering circuit and zero passage comparator circuit for another road, this square-wave signal enters into the external interrupt 0 of CPU, trigger external interrupt, and then trigger the CPU timer internal, realize the measurement of frequency.
What nonvolatile memory adopted is a jumbo ferroelectric memory, the reliability height of storage data, antijamming capability is strong, and the characteristics of difference and general EEPROM are, read or write speed is fast, can allow CPU have more time to come processing signals and control peripheral hardware.
Button adopts the highly sensitive button that touches, and various systematic parameters conveniently are set, and switches display interface.The parameter that is modified can be written in the nonvolatile memory fast.
The current every electrical energy parameter of demonstration that liquid crystal display drive circuit is real-time comprises: three-phase current magnitude of voltage, single-phase active power, three phases active power, single-phase reactive power, three phase reactive power, single-phase applied power, three-phase applied power, active electrical degree, idle electric degree etc.These parameters can be passed through 485 bus remote transmission.Make that this network can shared data.
One the tunnel specially for the RS485 communicating circuit provides working power, and another road provides working power for other circuit.The RS485 communicating circuit adopts the light isolation technology, can either guarantee that the promptness of transmitting can improve the communication part security again.Communications protocol mainly is the MODBUS field bus protocol.
The switch acquisition circuit is the duty that is used for gathering external unit, and real-time monitors it, and the state that will obtain uploads to Master Control Center, and the light-coupled isolation technology of employing has improved anti-interference.
Control relay circuit mainly is to realize long-range remote control and warning function, when abnormal occurrence, can the Remote and the actuating of relay, and also can allow equipment judge action voluntarily by setting.
Electric energy Parameters Calculation method: by the discrete digital signal that timer control ADC gathers up, this signal is converted to frequency-region signal by fft algorithm.Add up extraction of square root then of the squared magnitude of frequency-region signal can be obtained the effective value of current/voltage, and the signal of frequency domain be a plural number, and therefore the while can be calculated the phasing degree parameter of each phase signals.Can calculate power parameter according to current and voltage signals, specifically test method is, current phasor multiply by voltage vector can obtain active power and reactive power, and two a power square sum extraction of square root is applied power.The value of actual measurement has only current value, magnitude of voltage and frequency, and other electric energy parameter all is a calculated value.
This device can independently be finished the policer operation of the quality of power supply in this locality, also can connect into the upload operation that network carries out data by Shielded Twisted Pair, finishes long-range monitoring.When connecting network, need a main frame collector to form a network at least.
This device current input terminal must the external impressed current mutual inductor, because the volume ratio of the inner current transformer of device is less, when working long hours under full load situation, can directly have influence on the serviceable life of equipment.And when in the medium voltage electricity environment that is applied in 10KV, the signal front end circuit needs the external voltage mutual inductor, change the high voltage AC signal of 10KV into about 100V low-voltage ac signal, then enter into device interior and carry out data analysis, needing no-load voltage ratio coefficient with mutual inductor to be input in the middle of the device under the situation of external mutual inductor.And under the low pressure situation, just do not need the external voltage mutual inductor, and can be directly the AC signal of 380V be directly inputted in the equipment, carry out data analysis.As Fig. 2, Fig. 3.
In a word, this device is in conjunction with current power quality parameter watch-dog, and the intelligent device of the high integration high reliability that produces.
Claims (5)
1. one kind is used to measure electric current, the intelligent apparatus of voltage and power, it comprises power module, the signal front end circuit, CPU, the A/D change-over circuit, the RS485 communicating circuit, nonvolatile memory, the high-order filtering circuit, the zero passage comparator circuit, real-time clock generation circuit, crystal-oscillator circuit, control relay circuit, the on off state Acquisition Circuit, liquid crystal display drive circuit and key control circuit, it is characterized in that: signal front end circuit one tunnel outputs to the input end of A/D change-over circuit, another road output is by high-order filtering circuit and zero passage comparator circuit, be input to CPU, A/D change-over circuit output terminal, nonvolatile memory, real-time clock generation circuit, crystal-oscillator circuit, control relay circuit, the RS485 communicating circuit, the on off state Acquisition Circuit, liquid crystal display drive circuit and key control circuit all are connected with CPU.
2. be used to measure the intelligent apparatus of electric current, voltage and power according to claim 1, it is characterized in that power module exports two groups of 5V power supplys, the one tunnel specially for the RS485 communicating circuit provides working power, and another road provides working power for other circuit.
3. be used to measure the intelligent apparatus of electric current, voltage and power according to claim 1, it is characterized in that the RS485 communicating circuit adopts the light isolation technology.
4. be used to measure the intelligent apparatus of electric current, voltage and power according to claim 1, it is characterized in that the signal front end circuit needs the external voltage mutual inductor.
5. be used to measure the intelligent apparatus of electric current, voltage and power according to claim 1, it is characterized in that the current input terminal external impressed current mutual inductor of signal front end circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200920216755XU CN201796082U (en) | 2009-09-22 | 2009-09-22 | Intelligent device for measuring current, voltage and power |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200920216755XU CN201796082U (en) | 2009-09-22 | 2009-09-22 | Intelligent device for measuring current, voltage and power |
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| CN201796082U true CN201796082U (en) | 2011-04-13 |
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| CN200920216755XU Expired - Fee Related CN201796082U (en) | 2009-09-22 | 2009-09-22 | Intelligent device for measuring current, voltage and power |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102856920A (en) * | 2012-09-20 | 2013-01-02 | 金陵科技学院 | Three-phase unbalanced load compensation device and method |
| CN102890186A (en) * | 2011-07-20 | 2013-01-23 | 鸿富锦精密工业（深圳）有限公司 | Power testing circuit |
| CN103068141A (en) * | 2012-12-25 | 2013-04-24 | 江苏达胜加速器制造有限公司 | Accelerating pipe |
| CN104793049A (en) * | 2015-04-13 | 2015-07-22 | 武汉大学 | Digital power meter |
| CN105182856A (en) * | 2015-09-24 | 2015-12-23 | 北京雷博曼科技有限公司 | High voltage alternating signal acquisition system |
| CN108459205A (en) * | 2018-03-28 | 2018-08-28 | 合肥云智物联科技有限公司 | A kind of flow monitoring equipment based on power automatic system |
-
2009
- 2009-09-22 CN CN200920216755XU patent/CN201796082U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102890186A (en) * | 2011-07-20 | 2013-01-23 | 鸿富锦精密工业（深圳）有限公司 | Power testing circuit |
| CN102856920A (en) * | 2012-09-20 | 2013-01-02 | 金陵科技学院 | Three-phase unbalanced load compensation device and method |
| CN103068141A (en) * | 2012-12-25 | 2013-04-24 | 江苏达胜加速器制造有限公司 | Accelerating pipe |
| CN104793049A (en) * | 2015-04-13 | 2015-07-22 | 武汉大学 | Digital power meter |
| CN105182856A (en) * | 2015-09-24 | 2015-12-23 | 北京雷博曼科技有限公司 | High voltage alternating signal acquisition system |
| CN108459205A (en) * | 2018-03-28 | 2018-08-28 | 合肥云智物联科技有限公司 | A kind of flow monitoring equipment based on power automatic system |
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| C14 | Grant of patent or utility model | ||
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110413 Termination date: 20120922 |