CN106018925A - DC system intelligent sensor - Google Patents
DC system intelligent sensor Download PDFInfo
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- CN106018925A CN106018925A CN201610557398.8A CN201610557398A CN106018925A CN 106018925 A CN106018925 A CN 106018925A CN 201610557398 A CN201610557398 A CN 201610557398A CN 106018925 A CN106018925 A CN 106018925A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/0092—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring current only
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Abstract
The invention discloses a DC system intelligent sensor, which comprises a DC current measurement unit TA1, a leakage current measurement unit TA2, voltage-dividing circuits DVC1 and DVC2, filtering circuits LC1, LC2, a 5V power supply, decoupling circuits DEC1, DEC2 and DEC3, an electric energy metering chip U1, an ARM chip and a communication conditioning circuit, wherein the SPI end of the chip U1 is connected with the SPI end of the ARM chip for serial communication; the CAN end of the ARM chip is connected with an external communication master station via the communication conditioning circuit for CAN communication. The sensor integrates acquisition of the DC current and leakage current signals, AD conversion, real-time sampling numerical value calibration and digital communication transmission as a whole, mounting and wiring of the DC system are simplified, digital transmission for analog signals is realized, accuracy, quickness and timeliness of signal transmission are ensured, and signal interference during the transmission process can be avoided.
Description
Technical field
The present invention relates to a kind of direct current system intelligent sensor.
Background technology
Under supertension, bulk power grid, Large Copacity, automatization, intelligentized general layout, large-scale power system is the developing direction of current every country.Thus it is guaranteed that its safe and reliable operation ensure that economy is development main line, simultaneously in order to eliminate safe hidden trouble, stopping Accident of Large-scale incidence rate is that current emphasis carries out one of research direction.Power plant and transformer station be unable to do without for Operation of Electric Systems equipment, control protection equipment and the straight-flow system of signal monitoring equipment offer fundamental power supply.Straight-flow system is the DC power-supply system of a bulky complex.Owing to power plant and transformer substation system bus having a lot of branch road, therefore want whether each branch road of on-line monitoring occurs insulation fault to be the most difficult.And come always straight-flow system bus and branch road insulation against ground fault that electric fault rate is the first for a long time.Straight-flow system is after long-play; through moisture, the weather reason such as rainwater and various artificial origin to cause its insulation to decline phenomenon the most universal; this can become the hidden danger during safe operation of power system undoubtedly, and once accident occurs to be caused second protection equipment refused action or misoperation tremendous economic will be caused to lose to the country and people by straight-flow system insulation fault.
Needing to utilize Insulation Inspection Device for Direct-Current System that it is carried out long term monitoring at straight-flow system run duration, once system busbar insulation against ground situation declines and must quickly search fault branch and prevent fault from spreading the safe operation affecting whole power system.And the collection of fault branch DC current and leakage current is by the key of straight-flow system insulation against ground resistance detection, so great to the Research Significance of the straight-flow system sensor taking on this task.
The most domestic mode straight-flow system being monitored to generally two kinds of current transformer combinations of employing, a kind of transformer is used for measuring DC current, another kind of transformer is used for measuring DC leakage current, again two kinds of analog measurement signals are sent to monitoring system by circuit and carry out data process and analysis, and carry out fault alarm, when there being multiple monitoring point in straight-flow system, the connection of whole system is extremely complex, and the analogue signal measured can be by larger interference during transmission.
The present invention is directed to above-mentioned situation, devise a kind of direct current system intelligent sensor, this sensor is by DC current, the collection of leakage current signal, data process and digital communication and transmission becomes one, simplify the wiring of straight-flow system, achieve the Digital Transmission of analogue signal, it is ensured that the rapidity of signal transmission and promptness, and avoid the interference in signals transmission.
Summary of the invention
The goal of the invention of the present invention is to provide a kind of novel intelligence sensor for straight-flow system, this sensor can gather DC current and leakage current simultaneously, and the analog signals gathered is carried out analog digital conversion on the spot, the digital processings such as real time calibration, and the digital quantity signal after processing passes to monitoring system by CAN communication interface, this sensor is by DC current, the collection of leakage current signal, data process and digital communication and transmission becomes one, simplify the wiring of straight-flow system, achieve the Digital Transmission of analogue signal, ensure that the accuracy that signal transmits, rapidity and promptness, and avoid the interference in signals transmission.
The present invention realizes its goal of the invention especially by following technological means: include DC current measurement unit TA1, leakage current measurement unit leakage current measurement unit TA2, bleeder circuit DVC1, DVC2, filter circuit LC1, LC2,5V power supply, decoupling circuit DEC1, DEC2, DEC3, electric energy computation chip U1, ARM chip and the modulate circuit that communicates；The signal of measuring of described DC current measurement unit TA1 is connected through one end of described bleeder circuit DVC1 with described filter circuit LC1, and the other end of filter circuit LC1 is connected with V1P end and the V1N end of described electric energy computation chip U1 respectively；The signal of measuring of described leakage current measurement unit leakage current measurement unit TA2 is connected through one end of described bleeder circuit DVC2 with described filter circuit LC2, and the other end of filter circuit LC2 is connected with V2P end and the V2N end of described electric energy computation chip U1 respectively；V1P end distinguishes the positive and negative simulation input pin of corresponding two current channels with V1N end, V2P end and V2N end；Described 5V power supply is connected with AVDD end and the DVDD end of described electric energy computation chip U1 by described decoupling circuit DEC1, DEC2 respectively, described decoupling circuit DEC3 is directly connected with the REFV end of electric energy computation chip U1, described AVDD end is the analog power pin of electric energy computation chip U1, power to the analog portion of chip, described DVDD end is the digital power pin of electric energy computation chip U1, power to the numerical portion of chip, the input pin of voltage on the basis of described REFV end；The SPI end of described electric energy computation chip U1 is connected with the SPI end of described ARM chip, carries out serial communication；The CAN end of described ARM chip is connected with PERCOM peripheral communication main website by described communication modulate circuit, carries out CAN communication.
Preferably, the model of described electric energy computation chip U1 is RN8209G, described V1P end, V1N end and V2P end, V2N end are respectively the positive and negative simulation input pin of the current channel A and current channel B of electric energy computation chip U1, and described current channel A, B all use fully differential input mode；The power supply voltage range of described AVDD end and described DVDD end is 4.5V-5.5V；Described REFV end is the input pin of 2.5V reference voltage, uses a reference source within electric energy computation chip U1；Described electric energy computation chip U1 comprises a SPI serial communication interface.Preferably, the current-mode analog quantity signal that current channel A, B are inputted by described electric energy computation chip U1 carries out a series of process, and including A/D conversion links, DC offset correction link and gain calibration link, output is through the digital quantity current signal of calibration.
Preferably, the model of described ARM chip is STM8S208Cx, comprises a SPI serial communication interface and a CAN communication interface.
Preferably, described DC current measurement unit TA1 and leakage current measurement unit TA2 is Hall current sensor.
Preferably, described bleeder circuit is by the small resistor series connection of the resistance more than or equal to 7K Ω and a 1K Ω, the output valve that voltage is bleeder circuit at described small resistor two ends.
Preferably, described filter circuit is by a resistance and a capacitances in series composition, the output that voltage is filter circuit at described electric capacity two ends.
Preferably, described decoupling circuit is composed in parallel by one or more electric capacity.
Preferably, described communication modulate circuit includes filtering link, decoupling link and voltage stabilizing link, and described filtering link is made up of resistance and capacitances in series, and decoupling link is composed in parallel by multiple electric capacity, and voltage stabilizing link is made up of multiple stabilivolts.
Relative to prior art, there is advantages that
1) this sensor is by DC current, the collection of leakage current signal, and A/D conversion, the real time calibration of sample magnitude and digital communication and transmission become one, and simplify the installation wiring of straight-flow system.
2) achieve the Digital Transmission of analogue signal, it is ensured that accuracy, rapidity and the promptness of signal transmission, and avoid the interference in signals transmission.
Accompanying drawing explanation
Fig. 1 is the direct current system intelligent Fundamentals of Sensors figure of present pre-ferred embodiments.
Detailed description of the invention
As shown in Figure 1, the direct current system intelligent sensor of the present embodiment includes DC current measurement unit TA1, leakage current measurement unit TA2, bleeder circuit DVC1, DVC2, filter circuit LC1, LC2,5V power supply, decoupling circuit DEC1, DEC2, DEC3, electric energy computation chip U1, ARM chip and the modulate circuit that communicates；The measurement signal of described DC current measurement unit TA1, through described bleeder circuit DVC1, is connected with one end of described filter circuit LC1, and the other end of filter circuit LC1 is connected with V1P end and the V1N end of described electric energy computation chip U1 respectively；The measurement signal of described leakage current measurement unit TA2, through described bleeder circuit DVC2, is connected with one end of described filter circuit LC2, and the other end of filter circuit LC2 is connected with V2P end and the V2N end of described electric energy computation chip U1 respectively；Described 5V power supply is connected with AVDD end and the DVDD end of described electric energy computation chip U1 by described decoupling circuit DEC1, DEC2 respectively, and described decoupling circuit DEC3 is directly connected with the REFV end of electric energy computation chip U1；The SPI end of described electric energy computation chip U1 is connected with the SPI end of described ARM chip, carries out serial communication；The CAN end of described ARM chip is connected with PERCOM peripheral communication main website by described communication modulate circuit, carries out CAN communication.
The operation principle of the present embodiment is as follows: the DC current signal that DC current measurement unit TA1 measures is through bleeder circuit DVC1 dividing potential drop, after filter circuit LC1 Filtering Processing, it is input to the positive and negative simulation input pin of the current channel A of electric energy computation chip U1, through A/D conversion links, DC offset correction link and gain calibration link, the correcting current value of output digital quantity；Then electric energy computation chip U1 and ARM chip are by SPI serial communication, pass through the digital quantity correcting current value of process, this digital quantity correcting current value is stored in inside related register by ARM chip, when communication main station sends data requesting instructions by CAN communication circuit, this instruction is after the conditioning of communication modulate circuit, send the CAN communication port to ARM chip, after ARM chip receives data requesting instructions, digital quantity correcting current value is read in related register, send to CAN communication port, again after communication modulate circuit conditioning, sent to communication main station by CAN communication circuit.
The process of the leakage current signal that leakage current measurement unit TA2 measures is similar with the DC current signal that above-mentioned DC current measurement unit TA1 measures with transmitting procedure.
Certainly above-described embodiment is only for illustrating technology design and the feature of the present invention, its object is to allow person skilled in the art will appreciate that present disclosure and to implement according to this, can not limit the scope of the invention with this.All equivalent transformations done according to the spirit of main technical schemes of the present invention or modification, all should contain within protection scope of the present invention.
Claims (10)
1. direct current system intelligent sensor, including DC current measurement unit (TA1), leakage current measurement unit (TA2), bleeder circuit DVC1, DVC2, filter circuit LC1, LC2,5V power supply, decoupling circuit DEC1, DEC2, DEC3, electric energy computation chip (U1), ARM chip and the modulate circuit that communicates；The signal of measuring of described DC current measurement unit (TA1) is connected through one end of described bleeder circuit DVC1 with described filter circuit LC1, and the other end of filter circuit LC1 is connected with V1P end and the V1N end of described electric energy computation chip (U1) respectively；The signal of measuring of described leakage current measurement unit (TA2) is connected through one end of described bleeder circuit DVC2 with described filter circuit LC2, and the other end of filter circuit LC2 is connected with V2P end and the V2N end of described electric energy computation chip (U1) respectively；V1P end distinguishes the positive and negative simulation input pin of corresponding two current channels with V1N end, V2P end and V2N end；Described 5V power supply is connected with AVDD end and the DVDD end of described electric energy computation chip (U1) by described decoupling circuit DEC1, DEC2 respectively, described decoupling circuit DEC3 is directly connected with the REFV end of electric energy computation chip (U1), described AVDD end is the analog power pin of electric energy computation chip (U1), power to the analog portion of chip, described DVDD end is the digital power pin of electric energy computation chip (U1), power to the numerical portion of chip, the input pin of voltage on the basis of described REFV end；The SPI end of described electric energy computation chip (U1) is connected with the SPI end of described ARM chip, carries out serial communication；The CAN end of described ARM chip is connected with PERCOM peripheral communication main website by described communication modulate circuit, carries out CAN communication.
Direct current system intelligent sensor the most according to claim 1, it is characterized in that: the model of described electric energy computation chip (U1) is RN8209G, described V1P end, V1N end and V2P end, V2N end are respectively the positive and negative simulation input pin of the current channel A and current channel B of electric energy computation chip (U1), and described current channel A, B all use fully differential input mode；The power supply voltage range of described AVDD end and described DVDD end is 4.5V-5.5V；Described REFV end is the input pin of 2.5V reference voltage, uses a reference source that electric energy computation chip (U1) is internal；Described electric energy computation chip (U1) comprises a SPI serial communication interface.
Direct current system intelligent sensor the most according to claim 1, it is characterized in that: the current-mode analog quantity signal that current channel A, B are inputted by described electric energy computation chip (U1) carries out a series of process, including A/D conversion links, DC offset correction link and gain calibration link, output is through the digital quantity current signal of calibration.
Direct current system intelligent sensor the most according to claim 1, it is characterised in that: the model of described ARM chip is STM8S208Cx, comprises a SPI serial communication interface and a CAN communication interface.
Direct current system intelligent sensor the most according to claim 1, it is characterised in that: described DC current measurement unit (TA1) and leakage current measurement unit (TA2) are Hall current sensor.
Direct current system intelligent sensor the most according to claim 1, it is characterised in that: described bleeder circuit is by the small resistor series connection of the resistance more than or equal to 7K Ω and a 1K Ω, the output valve that voltage is bleeder circuit at described small resistor two ends.
Direct current system intelligent sensor the most according to claim 1, it is characterised in that: described filter circuit is by a resistance and a capacitances in series composition, the output that voltage is filter circuit at described electric capacity two ends.
Direct current system intelligent sensor the most according to claim 1, it is characterised in that: described decoupling circuit is composed in parallel by one or more electric capacity.
Direct current system intelligent sensor the most according to claim 1, it is characterized in that: described communication modulate circuit includes filtering link, decoupling link and voltage stabilizing link, described filtering link is made up of resistance and capacitances in series, decoupling link is composed in parallel by multiple electric capacity, and voltage stabilizing link is made up of multiple stabilivolts.
10. the method for work of a direct current system intelligent sensor according to claim 1, it is characterised in that:
The current signal that DC current measurement unit (TA1) or leakage current measurement unit (TA2) are measured is after dividing potential drop, Filtering Processing, it is input to positive and negative simulation input pin V1P, V1N or V2P of the current channel of electric energy computation chip (U1), V2N, through A/D conversion links, DC offset correction link and gain calibration link, the correcting current value of output digital quantity；Then electric energy computation chip (U1) and ARM chip are by SPI serial communication, pass through the digital quantity correcting current value of process, this digital quantity correcting current value is stored in inside related register by ARM chip, when communication main station sends data requesting instructions by CAN communication circuit, this instruction is after the conditioning of communication modulate circuit, send the CAN communication port to ARM chip, after ARM chip receives data requesting instructions, digital quantity correcting current value is read in related register, send to CAN communication port, again after communication modulate circuit conditioning, sent to communication main station by CAN communication circuit.
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| CN201610557398.8A CN106018925A (en) | 2016-07-15 | 2016-07-15 | DC system intelligent sensor |
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| CN201610557398.8A CN106018925A (en) | 2016-07-15 | 2016-07-15 | DC system intelligent sensor |
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Cited By (4)
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| CN107656235A (en) * | 2017-10-31 | 2018-02-02 | 国网冀北电力有限公司电力科学研究院 | A kind of measurement apparatus and method of computation chip reference voltage |
| CN108732414A (en) * | 2017-04-21 | 2018-11-02 | 西门子公司 | Current sensor and breaker |
| CN108983679A (en) * | 2018-08-23 | 2018-12-11 | 上海浦东发展银行股份有限公司郑州分行 | A kind of intelligent remote controlling terminal and system |
| CN112098712A (en) * | 2020-07-28 | 2020-12-18 | 宁波三星医疗电气股份有限公司 | Electricity larceny prevention method |
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