CN212300700U - SF6 pressure online monitoring system based on remote wireless communication technology - Google Patents
SF6 pressure online monitoring system based on remote wireless communication technology Download PDFInfo
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Abstract
The present disclosure provides an SF6 pressure online monitoring system based on a long-distance wireless communication technology. The system comprises: the system comprises Lora wireless convergence equipment, an Internet of things server and a plurality of SF6 wireless pressure sensors; the Lora wireless collecting device is used for receiving the measurement data sent by the SF6 wireless pressure sensors and forwarding the measurement data to the Internet of things server; the Internet of things server is used for receiving the measurement data sent by the Lora wireless convergence equipment, storing, displaying and analyzing the measurement data, and displaying alarm information when the measurement data is abnormal; each SF6 wireless pressure sensor is used for acquiring the measurement data and sending the measurement data to the Lora wireless convergence equipment through a Lora standard communication protocol. According to the system and the method, the SF6 pressure state can be monitored in real time, and the running safety of the system is improved.
Description
Technical Field
The utility model relates to an electric power thing networking technology field especially relates to a sulfur hexafluoride (SF 6) pressure on-line monitoring system based on remote wireless communication technique.
Background
Sulfur hexafluoride (SF 6) is a non-toxic, tasteless, colorless, non-combustible synthetic GAS, has insulation properties and arc extinguishing capability which are incomparable with common dielectrics, and is widely applied to electrical equipment such as high-voltage circuit breakers, GAS insulated metal enclosed Switchgear (GIS) and the like.
The existing circuit breaker and GIS equipment generally adopts a gas density relay to monitor SF6 pressure in situ, and meanwhile, a pressure node on the gas density relay is used for sending an SF6 low-pressure alarm and low-pressure locking signal to a remote place. At present, in actual operation and maintenance, the control of SF6 pressure data mainly depends on a manual meter reading mode, is influenced by inspection cycle, meter installation position, severe weather factors and other reasons, SF6 gas leakage and the development trend thereof cannot be found in time, and accidents that the main equipment is damaged and the stable operation of a system is influenced due to the fact that SF6 leaks seriously, the safety of the main equipment is endangered easily occur. With the demand of lean operation and maintenance and the construction of the transformer internet of things, the pressure state of SF6 needs to be monitored in real time.
At present, in an SF6 pressure online monitoring system, a communication mode between a field sensor device and a collecting unit or a control center mainly depends on wired or short-distance wireless communication. The wired communication method has problems of difficulty in installation and high failure rate, and the short-distance wireless communication is limited by the communication distance.
Disclosure of Invention
The embodiment of the disclosure provides an SF6 pressure on-line monitoring system based on remote wireless communication technology, can realize the real-time supervision to SF6 pressure state, promotes the security of system's operation.
According to a first aspect of the embodiments of the present disclosure, there is provided an SF6 pressure online monitoring system based on a long-distance wireless communication technology, including:
the system comprises Lora wireless convergence equipment, an Internet of things server and a plurality of SF6 wireless pressure sensors;
the Lora wireless collecting device is used for receiving the measurement data sent by the SF6 wireless pressure sensors and forwarding the measurement data to the Internet of things server;
the Internet of things server is used for receiving the measurement data sent by the Lora wireless convergence equipment, storing, displaying and analyzing the measurement data, and displaying alarm information when the measurement data is abnormal;
each SF6 wireless pressure sensor is used for acquiring the measurement data and sending the measurement data to the Lora wireless convergence equipment through a Lora standard communication protocol.
Optionally, wherein the measurement data includes at least a pressure measurement value, a temperature measurement value, and the SF6 wireless pressure sensor identification.
Optionally, wherein each SF6 wireless pressure sensor comprises:
the device comprises a measuring unit, a control unit, a power supply unit and a communication unit;
the measuring unit is used for acquiring the pressure measurement value and the temperature measurement value and sending the pressure measurement value and the temperature measurement value to the control unit;
the control unit is used for controlling the period of the measurement unit for acquiring the pressure measurement value and the temperature measurement value, storing the pressure measurement value and the temperature measurement value, and controlling the communication unit to communicate with the Lora wireless convergence device when judging that the pressure measurement value and the temperature measurement value meet preset conditions;
the power supply unit is used for providing working voltage for the measuring unit, the control unit and the communication unit;
the communication unit is used for communicating with the Lora wireless convergence device under the control of the control unit.
Optionally, wherein the measurement unit comprises: a temperature sensor, and an SF6 pressure gauge or gas density relay;
the temperature sensor is used for acquiring the temperature measurement value;
the SF6 pressure gauge or the gas density relay is used to obtain the pressure measurement.
Optionally, wherein the measurement unit further comprises:
and the AD conversion module is used for converting the temperature measurement value into a digital temperature measurement value, converting the pressure measurement value into a digital pressure measurement value and sending the digital temperature measurement value and the digital pressure measurement value to the control unit.
Optionally, the control unit is further configured to monitor operating states of the measurement unit and the communication unit; the operating state includes an idle state, a measurement state, and a wireless communication state.
Optionally, wherein the power supply unit comprises a lithium sub-battery and a power conversion module;
the lithium sub-battery is used for providing power supply voltage, and the power supply conversion module is used for converting the power supply voltage of the lithium sub-battery into working voltages corresponding to the measurement unit, the control unit and the communication unit respectively and outputting the working voltages to the measurement unit, the control unit and the communication unit.
Optionally, the communication unit communicates with the control unit through a serial port.
Optionally wherein the control unit is an STM32 processor.
According to the SF6 pressure on-line monitoring system based on the long-distance wireless communication technology of the embodiment of the present disclosure, the system includes: the system comprises Lora wireless convergence equipment, an Internet of things server and a plurality of SF6 wireless pressure sensors; the Lora wireless collecting device is used for receiving the measurement data sent by the SF6 wireless pressure sensors and forwarding the measurement data to the Internet of things server; the Internet of things server is used for receiving the measurement data sent by the Lora wireless convergence equipment, storing, displaying and analyzing the measurement data, and displaying alarm information when the measurement data is abnormal; each SF6 wireless pressure sensor is used for acquiring the measurement data and sending the measurement data to the Lora wireless convergence equipment through a Lora standard communication protocol. According to the system and the method, real-time monitoring of the SF6 pressure state can be achieved, a traditional manual field meter reading mode and an existing wired or short-distance wireless communication mode are replaced, and the system and the method have the advantages of being convenient to install, high in reliability and the like, so that the safety of system operation is improved.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and together with the description, serve to explain the principles of the disclosure.
Fig. 1 is a schematic structural diagram of an SF6 pressure online monitoring system based on a long-distance wireless communication technology according to an embodiment of the present disclosure;
fig. 2 is a schematic structural diagram of an SF6 wireless pressure sensor in an SF6 pressure online monitoring system based on a long-distance wireless communication technology according to an embodiment of the present disclosure;
fig. 3 is a schematic structural diagram of another SF6 wireless pressure sensor in an SF6 pressure online monitoring system based on a long-distance wireless communication technology according to an embodiment of the present disclosure;
fig. 4 is a schematic diagram of an operating state cycle of an SF6 wireless pressure sensor in an SF6 pressure online monitoring system based on a long-distance wireless communication technology according to an embodiment of the present disclosure;
fig. 5 is a schematic diagram illustrating the switching of the operating states of the SF6 wireless pressure sensor in the SF6 online pressure monitoring system based on the long-distance wireless communication technology according to the embodiment of the disclosure.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the exemplary embodiments below are not intended to represent all implementations consistent with the present disclosure. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present disclosure, as detailed in the appended claims.
The embodiment of the disclosure provides an SF6 pressure online monitoring system based on a long-distance wireless communication technology. As shown in fig. 1, the SF6 pressure online monitoring system based on the long-distance wireless communication technology comprises:
a Long Range Radio (Lora) wireless sink device, an internet of things server, and a plurality of SF6 wireless pressure sensors.
The Lora wireless convergence device is used for receiving the measurement data sent by the SF6 wireless pressure sensors and forwarding the measurement data to the Internet of things server.
It should be noted that the coverage distance of the Lora wireless aggregation device is at least 2km, and the Lora wireless aggregation device can acquire measurement data sent by all SF6 wireless pressure sensors in the coverage area. The Lora wireless aggregation device can specifically forward data to the internet of things server in a 3G/4G/5G wireless or wired mode.
In practical use, only 1-2 Lora wireless collection devices are needed for one substation to meet the requirement of full coverage, and each Lora wireless collection device can support at least 500 SF6 wireless pressure sensor accesses.
The internet of things server is used for receiving the measurement data sent by the Lora wireless collection equipment, storing, displaying and analyzing the measurement data, and displaying alarm information when the measurement data is abnormal.
Specifically, the internet of things server can be an internet of things access platform based on a common cloud or an enterprise self-owned cloud, and operation and maintenance personnel can master and know SF6 gas pressure states and change trends of each electrical device in real time through the internet of things server, so that abnormal conditions can be found in time.
Each SF6 wireless pressure sensor is used for acquiring the measurement data and sending the measurement data to the Lora wireless convergence equipment through a Lora standard communication protocol.
As shown in fig. 2 and 3, the SF6 wireless pressure sensor may specifically include a measurement unit, a control unit, a power supply unit, and a communication unit.
The measuring unit is used for acquiring a pressure measuring value and a temperature measuring value and sending the pressure measuring value and the temperature measuring value to the control unit. In practical application, the measuring unit can be installed in electrical equipment such as a circuit breaker, a transformer and a GIS combined electrical appliance, and is used for measuring the pressure or density of SF6 gas inside the electrical equipment. The measuring unit can be connected with the SF6 wireless pressure sensor main body through a double-layer shielded cable, wherein one layer is grounded, and the other layer is connected with the equipment shell, so that the analog or digital signals are ensured not to be interfered.
Specifically, the measurement unit may include: a temperature sensor, and an SF6 pressure gauge or gas density relay. Wherein the temperature sensor is used for acquiring the temperature measurement value; the SF6 pressure gauge or the gas density relay is used to obtain the pressure measurement. In practical applications, the measurement unit further includes: and the AD conversion module is used for converting the temperature measurement value into a digital temperature measurement value, converting the pressure measurement value into a digital pressure measurement value and sending the digital temperature measurement value and the digital pressure measurement value to the control unit.
In the actual use process, the SF6 pressure measuring instrument or the gas density relay collects the pressure measuring value, such as a current signal, converts the current signal into a voltage signal required by an AD conversion module, and provides a reference voltage signal for the SF6 pressure measuring instrument or the gas density relay.
In one example, an SF6 pressure gauge or gas density relay may output pressure measurements in the form of modbus rtu digital quantities and send the pressure measurements to the control unit via an RS485 interface. The current signal, which is for example 4-20mA in size, can be converted to a voltage signal of 0-5V, while the reference voltage signal can be for example 12V or 24V.
The temperature sensor is used for measuring the ambient temperature, and since the SF6 gas pressure value is related to the temperature of the working environment, if the instrument device does not have the automatic temperature compensation function, the temperature compensation value can be calculated according to the temperature measurement value provided by the temperature sensor.
The AD conversion module may be adapted to convert the analog quantity into a digital quantity and to send the result to the control unit. In one example, the AD conversion module may use a high precision analog-to-digital converter (ADC) chip with ADs 111516 bit resolution from TI corporation. This embodiment is not particularly limited thereto.
Specifically, the control unit is a core unit of the SF6 wireless pressure sensor, and can complete storage, calculation and package of data. The control unit may be configured to control the measurement unit to acquire the pressure measurement value and the temperature measurement value in a cycle, store the pressure measurement value and the temperature measurement value, and control the communication unit to communicate with the Lora wireless convergence device when determining that the pressure measurement value and the temperature measurement value satisfy a preset condition.
Alternatively, the control unit may control the measurement unit to acquire the pressure measurement value and the temperature measurement value when a preset measurement value acquisition period is reached. And when a preset data sending period is reached, controlling the communication unit to send the digital temperature measurement value and the digital pressure measurement value which are newly added in the period to the Lora wireless convergence equipment.
Wherein the preset condition may include: the pressure measurement or the temperature measurement is below a preset threshold. Correspondingly, the control unit may specifically be configured to: and when the pressure measurement value or the temperature measurement value is lower than the preset threshold value, controlling the communication unit to send alarm information to the Lora wireless convergence equipment.
In one example, the measurement acquisition period is denoted as PMeasIn minutes. For example, a PMeas5 minutes or 10 minutes. Recording the preset data transmission period as PTXIn minutes. The control unit is controlled by PMeasThe pressure measurement value and the temperature measurement value are acquired for the period control measurement unit, and are sent to the Lora wireless collection device by taking the PTX as the period control communication unit, so that operation and maintenance personnel can master the variation trend of the SF6 gas pressure in time. In practical applications, if the pressure measurement is within the preset threshold, the control unit may store a certain amount of pressure measurement and temperature measurement and send these measurements to the Lora wireless sink device at a time for a longer period.
For example, PMeasThe control unit stores the 12 measurement results for 5 minutes and then packs and sends the data to the Lora wireless convergence device at one time, and P isTXIt was 60 minutes. In general, the power consumption of the communication unit during operation is the highest among all units of the SF6 wireless pressure sensor, so it is important to reduce the operation time of the communication unit as much as possible to reduce the overall power consumption of the SF6 wireless pressure sensor. Usually, P isTXIs set to a value of PMeasSeveral times higher.
Alternatively, the control unit may be a low power STM32 processor. In an actual application process, a chip used by the control unit may be selected according to an actual requirement, which is not specifically limited in this embodiment.
Specifically, the power supply unit is configured to provide operating voltages for the measurement unit, the control unit, and the communication unit. The power supply unit comprises a lithium sub-battery and a power supply conversion module; the lithium sub-battery is used for providing power supply voltage, and the power supply conversion module is used for converting the power supply voltage of the lithium sub-battery into working voltages corresponding to the measurement unit, the control unit and the communication unit respectively and outputting the working voltages to the measurement unit, the control unit and the communication unit.
The lithium sub-battery can be a disposable lithium sub-battery, the output voltage is 2.0-3.6V, and the power conversion module converts the output voltage of the lithium sub-battery into the working voltage of each unit. For example, 2.0-3.6V is converted into a 12V/24V voltage signal required by the measuring unit, etc. In practical application, the lithium subcell can adopt a mode of combining TL-4920 and HLC-1520A, so that the lithium subcell can meet the requirements of high density and low self-discharge characteristics and can provide the instantaneous power requirement when a communication unit transmits.
Specifically, the communication unit is configured to communicate with the Lora wireless aggregation device under the control of the control unit. The communication unit is communicated with the control unit through a serial port; the communication unit communicates with the Lora wireless convergence device via a Lora standard communication protocol.
It can be understood that the biggest characteristic of the lora wireless communication technology is to realize the unification of low power consumption and long distance, and the distance of the lora wireless communication technology is enlarged by 3-5 times compared with the traditional wireless radio frequency communication technology under the same power consumption. Specifically, the transmission distance of Lora is: the town can reach 2-5Km, and the suburban area can reach 15 Km.
In one example, the communication unit may adopt an S78S chip integrating ARM Cortex-M0 + (32-bit RISC kernel, working dominant frequency 32 MHz) MCU and LoRa module. Because the S78S chip integrates a low-power CPU and a Lora module, the power consumption and the area of the sensor device are reduced to the maximum extent.
As shown in fig. 4, in the present embodiment, the operating state of the SF6 wireless pressure sensor is designed as follows: idle (idle) state, measurement state, and wireless communication state. Correspondingly, the control unit can also be used for monitoring the working states of the measuring unit and the communication unit. The operation of the SF6 wireless pressure sensor is illustrated by the following table:
watch 1
| SF6 pressure measuring instrument | Temperature sensor | AD conversion module | Control unit | Communication unit | |
| Idle State | Close off | Close off | Close off | Sleep state | Sleep state |
| Measuring state | Work by | Work by | Work by | Low power consumption state | Sleep formState of the art |
| State of wireless communication | Close off | Close off | Close off | Work by | Work by |
Specifically, in the idle state, the sensor has no measurement and communication tasks, and only the normal state of the SF6 wireless pressure sensor needs to be maintained. The SF6 wireless pressure sensor should be in Idle state most of the time. In the Idle state, each unit inside the SF6 wireless pressure sensor should be in a closed state or a sleep state. The timer in the control unit can wake up the control unit, so that the control unit can further control the working state of other units. Generally, the operating current of the SF6 wireless pressure sensor in the Idle state is only a few microamperes (uA).
In the measuring state, the SF6 wireless pressure sensor needs to complete the measuring function. SF6 wireless pressure sensor with PMeasThe measurement state is entered for a period. In the measuring state, the interior of the SF6 wireless pressure sensor only needs to work with units or modules related to measurement. Because the operation and calculation requirements under the measurement state are not high, the control unit can work in a low power consumption state, so that the power consumption of the control unit can be reduced. The duration of the measurement state is defined as TMeas. Due to the fact thatMeasIs much smaller than PMeasTherefore, the power consumed in the measurement state is much smaller in conversion to the average power (T)Meas/PMeas). Generally, TMeasApproximately 500 milliseconds or so.
In the wireless communication state, the SF6 wireless pressure sensor can support wireless communication functions. SF6 wireless pressure sensor with PTXThe wireless communication state is entered for a period. The measurement related unit may be turned off in the wireless communication state. ControlThe control unit and the communication unit are in working state. The duration of the wireless communication state is defined as TM&Tx. Due to the fact thatM&TxIs much smaller than PTXTherefore, the power consumed in the wireless communication state is much smaller in conversion to the average power (T)M&Tx/PTX). Generally, TM&TxAbout 2 seconds or so.
As shown in FIG. 5, the SF6 wireless pressure sensor state is mostly in the Idle state every TMeasThe state of the wireless pressure sensor at the time SF6 enters a measurement state from an Idle state, and the measurement task is completed. After each measurement task is completed, if the measurement result meets the preset condition or meets PTXPeriodically, the SF6 wireless pressure sensor will enter the wireless communication state from the measurement state, otherwise will return to the Idle state from the measurement state. The SF6 wireless pressure sensor will automatically return to the Idle state after completing the wireless communication task. Therefore, the average power consumption of the SF6 wireless pressure sensor is effectively reduced, and the service life and the stability are improved.
According to the SF6 online pressure monitoring system based on the long-distance wireless communication technology, the Lora wireless convergence device is used for receiving the measurement data sent by each SF6 wireless pressure sensor and forwarding the measurement data to the Internet of things server; the Internet of things server is used for receiving the measurement data sent by the Lora wireless convergence equipment, storing, displaying and analyzing the measurement data and displaying alarm information when the measurement data is abnormal; and be used for acquireing measured data, and will measured data pass through Lora standard communication protocol and send to a plurality of SF6 wireless pressure sensor of Lora wireless collection equipment can realize the real-time supervision to SF6 pressure state, has replaced traditional artifical on-the-spot meter reading mode and current wired or short distance wireless communication mode, has characteristics such as simple to operate, reliability height to promote the security of system operation.
Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This application is intended to cover any variations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.
It will be understood that the present disclosure is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.
Claims (10)
1. An SF6 pressure online monitoring system based on a long-distance wireless communication technology is characterized by comprising:
the system comprises Lora wireless convergence equipment, an Internet of things server and a plurality of SF6 wireless pressure sensors;
the Lora wireless collecting device is used for receiving the measurement data sent by the SF6 wireless pressure sensors and forwarding the measurement data to the Internet of things server;
the Internet of things server is used for receiving the measurement data sent by the Lora wireless convergence equipment, storing, displaying and analyzing the measurement data, and displaying alarm information when the measurement data is abnormal;
each SF6 wireless pressure sensor is used for acquiring the measurement data and sending the measurement data to the Lora wireless convergence equipment through a Lora standard communication protocol.
2. The system of claim 1, wherein the measurement data includes at least a pressure measurement, a temperature measurement, and the SF6 wireless pressure sensor identification.
3. The system of claim 2, wherein each SF6 wireless pressure sensor comprises:
the device comprises a measuring unit, a control unit, a power supply unit and a communication unit;
the measuring unit is used for acquiring the pressure measurement value and the temperature measurement value and sending the pressure measurement value and the temperature measurement value to the control unit;
the control unit is used for controlling the period of the measurement unit for acquiring the pressure measurement value and the temperature measurement value, storing the pressure measurement value and the temperature measurement value, and controlling the communication unit to communicate with the Lora wireless convergence device when judging that the pressure measurement value and the temperature measurement value meet preset conditions;
the power supply unit is used for providing working voltage for the measuring unit, the control unit and the communication unit;
the communication unit is used for communicating with the Lora wireless convergence device under the control of the control unit.
4. The system of claim 3, wherein the measurement unit comprises: a temperature sensor, and an SF6 pressure gauge or gas density relay;
the temperature sensor is used for acquiring the temperature measurement value;
the SF6 pressure gauge or the gas density relay is used to obtain the pressure measurement.
5. The system of claim 4, wherein the measurement unit further comprises:
and the AD conversion module is used for converting the temperature measurement value into a digital temperature measurement value, converting the pressure measurement value into a digital pressure measurement value and sending the digital temperature measurement value and the digital pressure measurement value to the control unit.
6. The system of claim 5, wherein the preset conditions include: the pressure measurement or the temperature measurement is below a preset threshold;
the control unit is specifically configured to: controlling the measurement unit to acquire the pressure measurement value and the temperature measurement value when a preset measurement value acquisition period is reached;
when a preset data sending period is reached, controlling the communication unit to send the digital temperature measurement value and the digital pressure measurement value which are newly added in the period to the Lora wireless convergence equipment;
and when the pressure measurement value or the temperature measurement value is lower than the preset threshold value, controlling the communication unit to send alarm information to the Lora wireless convergence equipment.
7. The system of claim 3, wherein the control unit is further configured to monitor an operating status of the measurement unit and the communication unit; the operating state includes an idle state, a measurement state, and a wireless communication state.
8. The system of claim 3, wherein the power supply unit comprises a lithium subcell and a power conversion module;
the lithium sub-battery is used for providing power supply voltage, and the power supply conversion module is used for converting the power supply voltage of the lithium sub-battery into working voltages corresponding to the measurement unit, the control unit and the communication unit respectively and outputting the working voltages to the measurement unit, the control unit and the communication unit.
9. The system of claim 3, wherein the communication unit communicates with the control unit via a serial port.
10. The system of claim 3, wherein the control unit is an STM32 processor.
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