CN106597090B - Electric energy data acquisition system based on wireless network transmission and working method thereof - Google Patents
Electric energy data acquisition system based on wireless network transmission and working method thereof Download PDFInfo
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- CN106597090B CN106597090B CN201710065112.9A CN201710065112A CN106597090B CN 106597090 B CN106597090 B CN 106597090B CN 201710065112 A CN201710065112 A CN 201710065112A CN 106597090 B CN106597090 B CN 106597090B
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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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- 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
- G01R22/061—Details of electronic electricity meters
- G01R22/063—Details of electronic electricity meters related to remote communication
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- G—PHYSICS
- G08—SIGNALLING
- G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
- G08C17/00—Arrangements for transmitting signals characterised by the use of a wireless electrical link
- G08C17/02—Arrangements for transmitting signals characterised by the use of a wireless electrical link using a radio link
Abstract
The invention discloses an electric energy data acquisition system based on wireless network transmission, relates to an acquisition and detection system of a power grid line and a working method thereof, and can be widely used for signal acquisition and detection of a low-voltage line. The electric energy data acquisition system based on wireless network transmission consists of an electric quantity acquisition device, a communication power supply device and a patch type voltage acquisition device; the electric quantity acquisition device is connected with the communication power supply device through a communication bus; the patch type voltage acquisition device transmits data to the communication power supply device through wireless transmission. The electric quantity acquisition device is provided with a first shell; a communication bus interface and a manual coding switch are arranged on one surface of the shell; a first shell is internally provided with a current signal acquisition interface, a temperature signal acquisition interface, a Programmable Gain Amplifier (PGA), a digital signal converter (second order sigma-delta ADC), a precise reference source, a filtering module, a metering module, a precise clock and a communication module.
Description
Technical Field
The invention discloses an electric energy data acquisition system based on wireless network transmission, relates to an acquisition and detection system of a power grid line and a working method thereof, and can be widely used for signal acquisition and detection of a low-voltage line.
Background
Along with the high-speed development of infrastructure, especially the large-scale development of real estate, national economy is higher and higher to the demand of electric power, also put forward higher and higher requirement to the regulation and control of electric wire netting, many times the electric wire netting in case breaks down and can not in time get rid of, can trigger the chain reaction and bring huge economic loss, but current supervisory equipment is usually large-scale hub supervisory equipment, through inserting high-voltage power network, monitor backbone circuit, the purchasing running cost of this kind of equipment is higher, and be used for the detection of high-voltage circuit generally, often have surplus and insufficient to the circuit network of low pressure, the degree of refinement is insufficient, often have blind spot to the monitoring of specific power consumption places such as district, industrial park, can not go deep into the intensive detection, so it is necessary to design a check out equipment to monitor the running condition of low-voltage electric wire netting in real time, satisfy actual use demand.
Disclosure of Invention
Aiming at the defects, the invention provides an electric energy data acquisition system based on wireless network transmission, which is used for acquiring operation data such as voltage, current and the like in a three-phase line, analyzing the condition of the line, automatically alarming when abnormal conditions occur, and has excellent use and popularization values.
The electric energy data acquisition system based on wireless network transmission consists of an electric quantity acquisition device, a communication power supply device and a patch type voltage acquisition device; the electric quantity acquisition device is connected with the communication power supply device through a communication bus;
the patch type voltage acquisition device transmits data to the communication power supply device through wireless transmission.
The electric quantity acquisition device is provided with a first shell; a communication bus interface and a manual coding switch are arranged on one surface of the shell; a current signal acquisition interface, a temperature signal acquisition interface, a Programmable Gain Amplifier (PGA), a digital signal converter (second order sigma-delta ADC), a precise reference source, a filtering module, a metering module, a precise clock and a communication module are arranged in the first shell;
the communication bus can supply power to the electric quantity acquisition device and perform data transmission;
a current signal acquisition interface is arranged in the three-phase circuit; the current signal acquisition interface is connected to a Programmable Gain Amplifier (PGA), a digital signal converter (second order sigma-delta ADC) and a filtering module through data lines, and all the filtering modules are connected to the metering module through respective data lines; meanwhile, a voltage sampling signal provided by a communication power supply device through a communication bus interface is connected to a Programmable Gain Amplifier (PGA), a digital signal converter (second order sigma-delta ADC) and a filtering module through data lines, and all the filtering modules are connected to a metering module through respective data lines; the metering module calculates and processes the collected current signals and voltage signals, the metering module is connected to the communication module through a data line, the processed electric quantity data are transmitted to the communication module, and the communication module is connected to the communication power supply device through a communication bus; one end of the communication bus is connected with the interface of the communication power supply device, the other end of the communication bus is correspondingly connected to the electric quantity acquisition device, and the processing unit of the communication power supply device receives the electric quantity data calculated and processed by the electric quantity acquisition device;
the digital signal converter (second order sigma-delta ADC) is also connected to a precise reference source through a data line, the precise reference source is used for accurately measuring the input voltage or current, and the metering module is also connected with a precise clock and used for providing a precise sampling period and ensuring accurate electric quantity calculation.
The communication module is also connected with a manual coding switch through a data line, and the manual coding switch is respectively set to be in a state of 0 or 1 through two groups of switches, so that 4 different codes can be coded according to the needs.
The precise reference source is a precise band gap voltage reference source with drift less than 10 ppm.
The precision clock is a precision clock with drift less than 20 ppm.
The electric quantity acquisition device is also provided with a temperature signal acquisition interface, the temperature acquisition interface is connected to a Programmable Gain Amplifier (PGA) through a data line, the Programmable Gain Amplifier (PGA) is connected with a digital signal converter (sigma-delta ADC), and the digital signal converter (sigma-delta ADC) is connected with a metering module.
The temperature signal acquisition interface can be externally connected with a thermistor Rr,
the first shell is also provided with a plurality of indicator lamps, and each indicator lamp is respectively connected with the metering module and used for displaying the working states of various devices.
A handle is further arranged on one surface of the shell.
The electric quantity acquisition device is provided with two groups of current signal acquisition interfaces and two groups of temperature signal acquisition interfaces, and can simultaneously acquire and calculate working parameters of two groups of three-phase circuits.
The first shell is also provided with a sliding rail which can be slidably arranged on a rail arranged in the power distribution cabinet.
The communication power supply device is provided with a second shell, and a communication bus interface, an RS485 communication port, a wireless 2.4G data receiving antenna, a wireless 433M data transmitting antenna, a wired network interface, a main voltage acquisition interface, a backup voltage acquisition interface and a manual coding switch are arranged on the second shell;
a signal amplifying/filtering module, a voltage detecting module, a differential/buffer circuit, a rectifying circuit, a wide-range AC/DC power module, a processing unit, a 2.4G wireless communication module, a 433M long-distance communication module, an RS485 communication module and an Ethernet access module are arranged in the second shell;
in the communication power supply device, a wireless 2.4G data receiving antenna is connected with a 2.4G wireless communication module; the wireless 433M data transmitting antenna is connected with the 433M long-distance communication module; the RS485 communication port is connected with the RS485 communication module;
the 2.4G wireless communication module, the 433M long-distance communication module, the RS485 communication module and the Ethernet access module are respectively connected with the processor;
the three-phase circuit is connected with 3 main voltage acquisition interfaces UA, UB and UC respectively; each main voltage acquisition interface or each backup voltage acquisition interface is respectively and sequentially connected with a corresponding signal amplifying/filtering module, and is connected to a voltage detection module through the signal amplifying/filtering module, and three-phase voltage signals after switching selection are sent to a communication bus interface through a differential/buffer circuit and are provided for an electric quantity acquisition device through a communication bus for calculation; meanwhile, after the main voltage or the backup voltage is acquired, three-phase rectifying current is respectively carried out and is sent to a wide-range AC/DC power module; the processing unit receives the electric quantity data transmitted by the electric quantity acquisition device and the patch type voltage acquisition device at the same time, calculates and screens the electric quantity data in a time-sharing mode, and sends the electric quantity data to the communication manager through a wired network or a wireless data sending antenna.
The processing unit is a Cortex series CPU.
The 2.4G wireless communication receiving antenna can receive the state and configuration data signals sent by the patch type voltage acquisition device;
the RS485 communication module can receive equipment operation data with an RS485 communication interface.
The 433M communication module can transmit data to the communication manager in a wireless and long-distance mode.
And the second shell is also provided with a plurality of indicator lamps, and each indicator lamp is respectively connected with the metering module to display the working states of various devices.
The second surface of the shell is also provided with a handle.
The manual coding switches on the communication power supply device are provided with a plurality of groups, each group of switches is respectively set to be in a state of 0 or 1, when the manual coding switches are in 10 groups, the 1 st to 5 th groups of coding switches represent the serial numbers of the communication power supply device, the 6 th to 7 th groups are standby coding switches, and the 8 th to 10 th groups are channel selection coding switches, so that a plurality of different codes can be coded according to the needs.
The number of the electric quantity acquisition devices which can be connected by the communication buses on the single communication power supply device is 1-4.
The patch type voltage acquisition device comprises a substrate and a housing III, wherein the substrate is arranged in the housing III, the housing III is a nonmetallic housing, and a signal acquisition module, an anti-interference digital filter module, a signal processing module, a wireless transceiver module and a power supply are arranged on the substrate; the signal acquisition module, the anti-interference digital filtering module, the signal processing module and the wireless receiving and transmitting module are sequentially connected through signal wires, and the front end of the signal acquisition module extends out of the third shell; the power supply provides power for the anti-interference digital filtering module, the signal processing module and the wireless receiving and transmitting module through circuits arranged on the substrate.
The signal acquisition module is an electric field induction antenna, and can sense the voltage of a circuit through electric field induction in a non-contact manner to pick up weak electric field signals.
The anti-interference digital filtering module is a Programmable Gain Amplifier (PGA) and can be combined with software to adaptively set the most appropriate amplification factor and transmit the amplification factor to the signal processing module for processing.
The signal processing module is a low-power STM8L101 processor of an intentional semiconductor company (ST), and can filter, high-pass filter and direct current drift; the low-pass filtering is used for filtering high-frequency interference, chip identification codes are further arranged on the signal processing modules, and each signal processing module is provided with a unique chip identification code.
The wireless transceiver module is a low-power consumption 2.4G wireless transmission module, and can realize the transmission of state and configuration data.
The power supply on the patch type voltage acquisition device is a silver oxide battery, a lithium battery, an alkaline manganese battery or a lead-acid storage battery.
Principle of operation
The electric quantity acquisition device, the communication power supply device and the patch type voltage acquisition device are respectively connected into corresponding circuits according to the requirements:
(1) The communication power supply device is connected to a 380V three-phase line to be monitored;
(2) Connecting the electric quantity acquisition device with a communication power supply device through a communication bus;
(3) The patch type voltage acquisition device is attached to each phase of the wire loop.
Secondly, the electric quantity acquisition device, the communication power supply device and the patch type voltage acquisition device acquire corresponding signals respectively:
(1) The electric quantity acquisition device acquires a current signal of a circuit and a temperature signal of the circuit;
(2) The communication power supply device collects voltage signals of the circuit;
(3) An electric field induction antenna on the patch type voltage acquisition device induces an electric field signal of an electrified line.
3. The electric quantity acquisition device, the communication power supply device and the patch type voltage acquisition device amplify acquired signals respectively:
(1) The communication power supply device collects voltage signals of the circuit and amplifies the voltage signals through a Programmable Gain Amplifier (PGA);
(2) The electric quantity acquisition device acquires a current signal of a circuit and a temperature signal of the circuit and amplifies the current signal through a Programmable Gain Amplifier (PGA);
(3) An electric field induction antenna on the patch type voltage acquisition device senses an electric field signal of an electrified line and amplifies the electric field signal through a Programmable Gain Amplifier (PGA).
4. The electric quantity acquisition device, the communication power supply device and the patch type voltage acquisition device respectively carry out filtering treatment on the amplified signals:
(1) The communication power supply device collects voltage signals of the line for filtering, high-pass filtering and DC drift filtering; low-pass filtering to remove high-frequency interference.
(2) The electric quantity acquisition device acquires a current signal of the circuit and a temperature signal of the circuit for filtering.
(3) An electric field induction antenna on the patch type voltage acquisition device induces an electric field signal of an electrified line to carry out filtering, high-pass filtering and direct current drift filtering; low-pass filtering to remove high-frequency interference.
The communication power supply device collects three-phase voltages and simultaneously provides data gateway and calculation support for the electric quantity collection device and the patch type voltage collection device, and the communication power supply device firstly sends the sampled voltages and the working voltages to the connected electric quantity collection device through a communication bus; the electric quantity acquisition device calculates the gain and corrects the phase of the acquired current and voltage signals in the full digital domain, and transmits the data signals of the measured and calculated active, reactive, electric power, power factor, frequency, phase angle, apparent power, reactive power, distortion rate and the like to the communication power supply device through the communication bus; and the patch type voltage acquisition device transmits the state and configuration data to the communication power supply device through the 2.4G antenna by calculating the gain of the filtered signal. The communication power supply device receives the electric quantity data transmitted by the electric quantity acquisition device and the patch type voltage acquisition device at the same time, calculates in a time-sharing mode, stores the electric quantity data in a corresponding memory, and transmits the electric quantity data to the communication manager through a wired network or a wireless data transmitting antenna.
The electric energy data acquisition system based on wireless network transmission can monitor the running condition of the related line in real time at a long distance, automatically display and give an alarm if the line condition is abnormal, and rapidly find out and process the fault line.
The invention has the advantages of ingenious conception, simple use, effective detection on the three-phase power grid and the alternating current circuit in the district or the factory in real time, good safety and convenient arrangement, and good use and popularization value.
Drawings
The invention will be further described with reference to the accompanying drawings in which:
fig. 1 is a schematic structural diagram of an electric energy data acquisition system based on wireless network transmission according to the present invention.
Fig. 2 is a schematic structural diagram of an electric quantity collection device in an electric energy data collection system based on wireless network transmission.
Fig. 3 is a schematic flow chart of a power collection device in a power data collection system based on wireless network transmission.
Fig. 4 is a schematic structural diagram of a communication power supply device in a wireless network transmission-based power data acquisition system according to the present invention.
Fig. 5 is a schematic flow chart of a communication power supply device in the electric energy data acquisition system based on wireless network transmission.
Fig. 6 is a schematic structural diagram of a patch type voltage acquisition device in an electric energy data acquisition system based on wireless network transmission.
Fig. 7 is a schematic flow chart of a patch type voltage acquisition device in an electric energy data acquisition system based on wireless network transmission.
Detailed Description
Referring to fig. 1-7, an electric energy data acquisition system based on wireless network transmission comprises an electric quantity acquisition device, a communication power supply device and a patch type voltage acquisition device; the electric quantity acquisition device is connected with the communication power supply device through a communication bus;
the patch type voltage acquisition device transmits data to the communication power supply device through wireless transmission.
The electric quantity acquisition device is provided with a first shell 1; the surface of the first shell 1 is provided with a communication bus interface 2 and a manual coding switch 3; a current signal acquisition interface, a temperature signal acquisition interface, a Programmable Gain Amplifier (PGA), a digital signal converter (second order sigma-delta ADC), a precise reference source, a filtering module, a metering module, a precise clock and a communication module are arranged in the first shell 1;
the communication bus can supply power to the electric quantity acquisition device and perform data transmission;
a current signal acquisition interface 6 is arranged in the three-phase circuit; the current signal acquisition interface 6 is connected to a Programmable Gain Amplifier (PGA), a digital signal converter (second order sigma-delta ADC) and a filtering module through data lines, and all the filtering modules are connected to the metering module through respective data lines; meanwhile, the voltage sampling signal provided by the communication power supply device through the communication bus interface 2 is connected to a Programmable Gain Amplifier (PGA), a digital signal converter (second order sigma-delta ADC) and a filtering module through data lines, and all the filtering modules are connected to the metering module through respective data lines; the metering module calculates and processes the collected current signals and voltage signals, the metering module is connected to the communication module through a data line, the processed electric quantity data are transmitted to the communication module, and the communication module is connected to the communication power supply device through a communication bus; one end of the communication bus is connected with the interface of the communication power supply device, the other end of the communication bus is correspondingly connected to the electric quantity acquisition device, and the processing unit of the communication power supply device receives the electric quantity data calculated and processed by the electric quantity acquisition device;
the digital signal converter (second order sigma-delta ADC) is also connected to a precise reference source through a data line, the precise reference source is used for accurately measuring the input voltage or current, and the metering module is also connected with a precise clock and used for providing a precise sampling period and ensuring accurate electric quantity calculation.
The communication module is also connected with a manual coding switch through a data line, and the manual coding switch is respectively set to be in a state of 0 or 1 through two groups of switches, so that 4 different codes can be coded according to the needs.
The precise reference source is a precise band gap voltage reference source with drift less than 10 ppm.
The precision clock is a precision clock with drift less than 20 ppm.
The electric quantity acquisition device is also provided with a temperature signal acquisition interface, the temperature acquisition interface is connected to a Programmable Gain Amplifier (PGA) through a data line, the Programmable Gain Amplifier (PGA) is connected with a digital signal converter (sigma-delta ADC), and the digital signal converter (sigma-delta ADC) is connected with a metering module.
The temperature signal acquisition interface can be externally connected with a thermistor Rr,
the shell I1 is also provided with a plurality of indicator lamps 4, and each indicator lamp 4 is respectively connected with the metering module to display the working states of various devices.
The surface of the first shell 1 is also provided with a handle 5.
The electric quantity acquisition device is provided with two groups of current signal acquisition interfaces 6 and two groups of temperature signal acquisition interfaces 7, and can simultaneously acquire and calculate working parameters of two groups of three-phase circuits.
The first shell 1 is also provided with a sliding rail which can be slidably arranged on a rail arranged in the power distribution cabinet.
The communication power supply device comprises a second shell 8, wherein a communication bus interface 9, an RS485 communication port 10, a wireless 2.4G data receiving antenna 11, a wireless 433M data transmitting antenna 12, a wired network interface 13, a main voltage acquisition interface 14, a backup voltage acquisition interface 15 and a manual coding switch 16 are arranged on the second shell 8;
a signal amplifying/filtering module, a voltage detecting module, a differential/buffer circuit, a rectifying circuit, a wide-range AC/DC power supply module, a processing unit, a 2.4G wireless communication module, a 433M long-distance communication module, an RS485 communication module and an Ethernet access module are arranged in the second shell 8;
in the communication power supply device, a wireless 2.4G data receiving antenna 11 is connected with a 2.4G wireless communication module; the wireless 433M data transmitting antenna 12 is connected with the 433M long-distance communication module; the RS485 communication port 10 is connected with an RS485 communication module;
the 2.4G wireless communication module, the 433M long-distance communication module, the RS485 communication module and the Ethernet access module are respectively connected with the processor;
the three-phase circuit is connected with 3 main voltage acquisition interfaces UA, UB and UC respectively; each main voltage acquisition interface or each backup voltage acquisition interface is respectively and sequentially connected with a corresponding signal amplifying/filtering module, and is connected to a voltage detection module through the signal amplifying/filtering module, and three-phase voltage signals after switching selection are sent to a communication bus interface through a differential/buffer circuit and are provided for an electric quantity acquisition device through a communication bus for calculation; meanwhile, after the main voltage or the backup voltage is acquired, three-phase rectifying current is respectively carried out and is sent to a wide-range AC/DC power module; the processing unit receives the electric quantity data transmitted by the electric quantity acquisition device and the patch type voltage acquisition device at the same time, calculates and screens the electric quantity data in a time-sharing mode, and sends the electric quantity data to the communication manager through a wired network or a wireless data sending antenna.
The processing unit is a Cortex series CPU.
The 2.4G wireless communication receiving antenna 11 can receive the state and configuration data signals sent by the patch type voltage acquisition device;
the RS485 communication module can receive the equipment operation data with the RS485 communication interface 10.
The 433M communication module can transmit data to the communication manager in a wireless and long-distance mode.
The second shell 8 is also provided with a plurality of indicator lamps 17, and each indicator lamp 17 is respectively connected with the metering module to display the working states of various devices.
The surface of the second shell 8 is also provided with a handle 18.
The manual coding switches 16 on the communication power supply device are provided with a plurality of groups, each group of switches is respectively set to be in a state of 0 or 1, when the manual coding switches are in 10 groups, the 1 st to 5 th groups of coding switches represent the serial numbers of the communication power supply device, the 6 th to 7 th groups are standby coding switches, and the 8 th to 10 th groups are channel selection coding switches, so that a plurality of different codes can be coded according to the needs.
The number of the electric quantity acquisition devices which can be connected by the communication buses on the single communication power supply device is 1-4.
The patch type voltage acquisition device comprises a substrate 20 and a third shell 19, wherein the substrate 20 is arranged in the third shell 19, the third shell 19 is a nonmetallic shell, and a signal acquisition module 22, an anti-interference digital filter module 23, a signal processing module 24, a wireless transceiver module 25 and a power supply 21 are arranged on the substrate 20; the signal acquisition module 22, the anti-interference digital filter module 23, the signal processing module 24 and the wireless transceiver module 25 are sequentially connected through signal wires, and the front end of the signal acquisition module 25 extends out of the third shell 19; the power supply 21 provides power for the anti-interference digital filtering module 23, the signal processing module 22 and the wireless transceiver module 25 through the circuits arranged on the substrate 20.
The signal acquisition module 22 is an electric field induction antenna, and can sense the voltage of a line through electric field induction in a non-contact manner to pick up weak electric field signals.
The anti-interference digital filtering module 23 is a Programmable Gain Amplifier (PGA), and can adaptively set the most appropriate amplification factor by combining software and transmit the amplification factor to the signal processing module for processing.
The signal processing module 24 is a low-power STM8L101 processor of an legal semiconductor company (ST), and can filter, high-pass filter and direct current drift; the low-pass filtering is used for filtering high-frequency interference, chip identification codes are further arranged on the signal processing modules, and each signal processing module is provided with a unique chip identification code.
The wireless transceiver module 25 is a low-power consumption 2.4G wireless transmission module, and can realize transmission of state and configuration data.
The power supply 21 on the patch type voltage acquisition device is a silver oxide battery, a lithium battery, an alkaline manganese battery or a lead-acid storage battery.
Principle of operation
The electric quantity acquisition device, the communication power supply device and the patch type voltage acquisition device are respectively connected into corresponding circuits according to the requirements:
(1) The communication power supply device is connected to a 380V three-phase line to be monitored;
(2) Connecting the electric quantity acquisition device with a communication power supply device through a communication bus;
(3) The patch type voltage acquisition device is attached to each phase of the wire loop.
Secondly, the electric quantity acquisition device, the communication power supply device and the patch type voltage acquisition device acquire corresponding signals respectively:
(1) The electric quantity acquisition device acquires a current signal of a circuit and a temperature signal of the circuit;
(2) The communication power supply device collects voltage signals of the circuit;
(3) An electric field induction antenna on the patch type voltage acquisition device induces an electric field signal of an electrified line.
3. The electric quantity acquisition device, the communication power supply device and the patch type voltage acquisition device amplify acquired signals respectively:
(1) The communication power supply device collects voltage signals of the circuit and amplifies the voltage signals through a Programmable Gain Amplifier (PGA);
(2) The electric quantity acquisition device acquires a current signal of a circuit and a temperature signal of the circuit and amplifies the current signal through a Programmable Gain Amplifier (PGA);
(3) An electric field induction antenna on the patch type voltage acquisition device senses an electric field signal of an electrified line and amplifies the electric field signal through a Programmable Gain Amplifier (PGA).
4. The electric quantity acquisition device, the communication power supply device and the patch type voltage acquisition device respectively carry out filtering treatment on the amplified signals:
(1) The communication power supply device collects voltage signals of the line for filtering, high-pass filtering and DC drift filtering; low-pass filtering to remove high-frequency interference.
(2) The electric quantity acquisition device acquires a current signal of the circuit and a temperature signal of the circuit for filtering.
(3) An electric field induction antenna on the patch type voltage acquisition device induces an electric field signal of an electrified line to carry out filtering, high-pass filtering and direct current drift filtering; low-pass filtering to remove high-frequency interference.
The communication power supply device collects three-phase voltages and simultaneously provides data gateway and calculation support for the electric quantity collection device and the patch type voltage collection device, and the communication power supply device firstly sends the sampled voltages and the working voltages to the connected electric quantity collection device through a communication bus; the electric quantity acquisition device calculates the gain and corrects the phase of the acquired current and voltage signals in the full digital domain, and transmits the data signals of the measured and calculated active, reactive, electric power, power factor, frequency, phase angle, apparent power, reactive power, distortion rate and the like to the communication power supply device through the communication bus; and the patch type voltage acquisition device transmits the state and configuration data to the communication power supply device through the 2.4G antenna by calculating the gain of the filtered signal. The communication power supply device receives the electric quantity data transmitted by the electric quantity acquisition device and the patch type voltage acquisition device at the same time, calculates in a time-sharing mode, stores the electric quantity data in a corresponding memory, and transmits the electric quantity data to the communication manager through a wired network or a wireless data transmitting antenna.
The electric energy data acquisition system based on wireless network transmission can monitor the running condition of the related line in real time at a long distance, automatically display and give an alarm if the line condition is abnormal, and rapidly find out and process the fault line.
Claims (10)
1. An electric energy data acquisition system based on wireless network transmission, which is characterized in that:
the electric energy data acquisition system based on wireless network transmission consists of an electric quantity acquisition device, a communication power supply device and a patch type voltage acquisition device; the electric quantity acquisition device is connected with the communication power supply device through a data communication bus, and the communication power supply device is used for providing a data gateway and calculation support for the electric quantity acquisition device and the patch type voltage acquisition device while acquiring three-phase voltage, and the communication power supply device is used for transmitting the sampling voltage and the working voltage to the connected electric quantity acquisition device through the communication bus; the electric quantity acquisition device calculates the gain and phase correction of the acquired current and voltage signals in the full digital domain, and transmits the data signals of the measured and calculated active, reactive, electric power, power factor, frequency, phase angle, apparent power, reactive electric energy and distortion rate to the communication power supply device through the communication bus; the patch type voltage acquisition device transmits the filtered signals through gain calculation and then transmits state and configuration data to the communication power supply device through the 2.4G antenna; the communication power supply device receives the electric quantity data transmitted by the electric quantity acquisition device and the patch type voltage acquisition device at the same time, calculates and stores the electric quantity data to a corresponding memory in a time-sharing manner, and transmits the electric quantity data to the communication manager through a wired network or a wireless 433M data transmitting antenna;
the patch type voltage acquisition device transmits data to the communication power supply device through wireless transmission;
the electric quantity acquisition device is provided with a first shell; a communication bus interface and a manual coding switch are arranged on one surface of the shell; a current signal acquisition interface, a temperature signal acquisition interface, a programmable gain amplifier, a digital signal converter, a precise reference source, a filtering module, a metering module, a precise clock and a communication module are arranged in the first shell;
the communication bus can supply power to the electric quantity acquisition device and perform data transmission;
a current signal acquisition interface is arranged in the three-phase circuit; the current signal acquisition interface is connected to the programmable gain amplifier digital signal converter and the filtering module through data lines, and all the filtering modules are connected to the metering module through respective data lines; meanwhile, a voltage sampling signal provided by the communication power supply device through a communication bus interface is connected to the programmable gain amplifier, the digital signal converter and the filtering module through data lines, and all the filtering modules are connected to the metering module through respective data lines; the metering module calculates and processes the collected current signals and voltage signals, the metering module is connected to the communication module through a data line, the processed electric quantity data are transmitted to the communication module, and the communication module is connected to the communication power supply device through a communication bus; one end of the communication bus is connected with the interface of the communication power supply device, the other end of the communication bus is correspondingly connected to the electric quantity acquisition device, and the processing unit of the communication power supply device receives the electric quantity data calculated and processed by the electric quantity acquisition device;
the digital signal converter is also independently connected to a precise reference source through a data line, the precise reference source is used for accurately measuring the input voltage or current, and the metering module is also connected with a precise clock and is used for providing a precise sampling period so as to ensure accurate electric quantity calculation;
the communication module is also connected with a manual coding switch through a data line, and the manual coding switch is respectively set to be in a state of 0 or 1 through two groups of switches, so that 4 different codes can be coded according to the needs;
the communication power supply device is provided with a second shell, and a communication bus interface, an RS485 communication port, a wireless 2.4G data receiving antenna, a wireless 433M data transmitting antenna, a wired network interface, a main voltage acquisition interface, a backup voltage acquisition interface and a manual coding switch are arranged on the second shell;
a signal amplifying/filtering module, a voltage detecting module, a differential/buffer circuit, a rectifying circuit, a wide-range AC/DC power module, a processing unit, a 2.4G wireless communication module, a 433M long-distance communication module, an RS485 communication module and an Ethernet access module are arranged in the second shell;
in the communication power supply device, a wireless 2.4G data receiving antenna is connected with a 2.4G wireless communication module; the wireless 433M data transmitting antenna is connected with the 433M long-distance communication module; the RS485 communication port is connected with the RS485 communication module;
the 2.4G wireless communication module, the 433M long-distance communication module, the RS485 communication module and the Ethernet access module are respectively connected with the processor;
the three-phase circuit is connected with 3 main voltage acquisition interfaces UA, UB and UC respectively; each main voltage acquisition interface or each backup voltage acquisition interface is respectively and sequentially connected with a corresponding signal amplifying/filtering module, and is connected to a voltage detection module through the signal amplifying/filtering module, and three-phase voltage signals after switching selection are sent to a communication bus interface through a differential/buffer circuit and are provided for an electric quantity acquisition device through a communication bus for calculation; meanwhile, after the main voltage or the backup voltage is acquired, three-phase rectifying current is respectively carried out and is sent to a wide-range AC/DC power module; the processing unit receives the electric quantity data transmitted by the electric quantity acquisition device and the patch type voltage acquisition device at the same time, calculates and screens the electric quantity data in a time-sharing mode, and transmits the electric quantity data to the communication manager through a wired network or a wireless data transmitting antenna;
the number of the electric quantity acquisition devices which can be connected by the communication buses on the single communication power supply device is 1-4;
the patch type voltage acquisition device comprises a substrate and a housing III, wherein the substrate is arranged in the housing III, the housing III is a nonmetallic housing, and a signal acquisition module, an anti-interference digital filter module, a signal processing module, a wireless transceiver module and a power supply are arranged on the substrate; the signal acquisition module, the anti-interference digital filtering module, the signal processing module and the wireless receiving and transmitting module are sequentially connected through signal wires, and the front end of the signal acquisition module extends out of the third shell; the power supply provides power for the anti-interference digital filtering module, the signal processing module and the wireless receiving and transmitting module through circuits arranged on the substrate.
2. The wireless network transmission-based power data acquisition system of claim 1, wherein: the precise reference source is a precise band gap voltage reference source with drift less than 10 ppm.
3. The wireless network transmission-based power data acquisition system of claim 1, wherein: the precision clock is a precision clock with drift less than 20 ppm.
4. The wireless network transmission-based power data acquisition system of claim 1, wherein: the electric quantity acquisition device is also provided with a temperature signal acquisition interface, the temperature acquisition interface is connected to a programmable gain amplifier through a data line, the programmable gain amplifier is connected with a digital signal converter, and the digital signal converter is connected with a metering module;
the temperature signal acquisition interface can be externally connected with a thermistor Rr.
5. The wireless network transmission-based power data acquisition system of claim 1, wherein: the first shell is also provided with a plurality of indicator lamps, and each indicator lamp is respectively connected with the metering module and used for displaying the working states of various devices;
a handle is further arranged on one surface of the shell;
the second shell is also provided with a plurality of indicator lamps, and each indicator lamp is respectively connected with the metering module and used for displaying the working states of various devices;
the second surface of the shell is also provided with a handle;
the first shell is also provided with a sliding rail which can be slidably arranged on a rail arranged in the power distribution cabinet.
6. The wireless network transmission-based power data acquisition system of claim 1, wherein: the electric quantity acquisition device is provided with two groups of current signal acquisition interfaces and two groups of temperature signal acquisition interfaces, and can simultaneously acquire and calculate working parameters of two groups of three-phase circuits.
7. The wireless network transmission-based power data acquisition system of claim 1, wherein: the manual coding switches on the communication power supply device are provided with a plurality of groups, each group of switches is respectively set to be in a state of 0 or 1, when the manual coding switches are in 10 groups, the 1 st to 5 th groups of coding switches represent the serial numbers of the communication power supply device, the 6 th to 7 th groups are standby coding switches, and the 8 th to 10 th groups are channel selection coding switches, so that a plurality of different codes can be coded according to the needs.
8. The wireless network transmission-based power data acquisition system of claim 1, wherein: the signal acquisition module is an electric field induction antenna, and can sense the voltage of a line through electric field induction in a non-contact manner to pick up weak electric field signals;
the anti-interference digital filtering module is a programmable gain amplifier, can be combined with software, adaptively sets the most appropriate amplification factor and transmits the amplification factor to the signal processing module for processing.
9. The wireless network transmission-based power data acquisition system of claim 1, wherein: the wireless transceiver module is a low-power consumption 2.4G wireless transmission module, and can realize the transmission of state and configuration data;
the power supply on the patch type voltage acquisition device is a silver oxide battery, a lithium battery, an alkaline manganese battery or a lead-acid storage battery.
10. The method for operating a wireless network transmission-based power data collection system of claim 1, wherein:
the electric quantity acquisition device, the communication power supply device and the patch type voltage acquisition device are respectively connected into corresponding circuits according to the requirements:
(1) The communication power supply device is connected to a 380V three-phase line to be monitored;
(2) Connecting the electric quantity acquisition device with a communication power supply device through a communication bus;
(3) The patch type voltage acquisition device is attached to each phase of wire loop;
secondly, the electric quantity acquisition device, the communication power supply device and the patch type voltage acquisition device acquire corresponding signals respectively:
(1) The electric quantity acquisition device acquires a current signal of a circuit and a temperature signal of the circuit;
(2) The communication power supply device collects voltage signals of the circuit;
(3) An electric field induction antenna on the patch type voltage acquisition device induces an electric field signal of an electrified line;
3. the electric quantity acquisition device, the communication power supply device and the patch type voltage acquisition device amplify acquired signals respectively:
(1) The communication power supply device collects voltage signals of the circuit and amplifies the voltage signals through the programmable gain amplifier;
(2) The electric quantity acquisition device acquires a current signal of a circuit and a temperature signal of the circuit and amplifies the current signal through the programmable gain amplifier;
(3) An electric field induction antenna on the patch type voltage acquisition device senses an electric field signal of an electrified line and amplifies the electric field signal through a programmable gain amplifier;
4. the electric quantity acquisition device, the communication power supply device and the patch type voltage acquisition device respectively carry out filtering treatment on the amplified signals:
(1) The communication power supply device collects voltage signals of the line for filtering, high-pass filtering and DC drift filtering; low-pass filtering to filter high-frequency interference;
(2) The electric quantity acquisition device acquires a current signal of a circuit and a temperature signal of the circuit for filtering;
(3) An electric field induction antenna on the patch type voltage acquisition device induces an electric field signal of an electrified line to carry out filtering, high-pass filtering and direct current drift filtering; low-pass filtering to filter high-frequency interference;
the communication power supply device collects three-phase voltages and simultaneously provides data gateway and calculation support for the electric quantity collection device and the patch type voltage collection device, and the communication power supply device firstly sends the sampled voltages and the working voltages to the connected electric quantity collection device through a communication bus; the electric quantity acquisition device calculates the gain and phase correction of the acquired current and voltage signals in the full digital domain, and transmits the data signals of the measured and calculated active, reactive, electric power, power factor, frequency, phase angle, apparent power, reactive electric energy and distortion rate to the communication power supply device through the communication bus; the patch type voltage acquisition device sends the state and configuration data to the communication power supply device through the 2.4G antenna through gain calculation of the filtered signals; the communication power supply device receives the electric quantity data transmitted by the electric quantity acquisition device and the patch type voltage acquisition device at the same time, calculates and stores the electric quantity data to a corresponding memory in a time-sharing manner, and transmits the electric quantity data to the communication manager through a wired network or a wireless data transmitting antenna;
the power data acquisition system based on wireless network transmission can monitor the running condition of the related line in real time at a long distance, and if the line condition is abnormal, the system can automatically display and alarm prompts, and can quickly find out and process the fault line.
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| CN112034407A (en) * | 2020-09-10 | 2020-12-04 | 云南电网有限责任公司电力科学研究院 | Power frequency alternating current voltage self-calibration unit and system |
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| KR100450573B1 (en) * | 2002-04-30 | 2004-10-06 | 한국산업안전공단 | Device for aralm attendant on sensing of near to high-voltage electric wire |
| US20070018841A1 (en) * | 2004-11-22 | 2007-01-25 | Nickerson Irvin H | High voltage proximity warning system utilizing wireless sensors and method |
| CN103323665B (en) * | 2012-03-19 | 2016-05-11 | 利思电气（上海）有限公司 | A kind of energy monitor front-end data acquisition device |
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