CN112649564A - Converter transformer inflatable sleeve SF6 leak detection system - Google Patents
Converter transformer inflatable sleeve SF6 leak detection system Download PDFInfo
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Abstract
The invention discloses a converter transformer inflatable sleeve SF6 leak detection system which comprises a sensing layer, a transmission layer and an application layer, wherein the sensing layer is composed of an SF6 sensor and an analysis module, the transmission layer is composed of an NB-IoT transmission protocol, and the application layer is composed of a workstation located in a main control room of a converter station. The sensing layer is used as a collecting node of SF6 leak detection and is used for collecting and analyzing SF6 content and oxygen content at a distribution point. And the transmission layer uploads the data to the Internet in a wireless communication mode through an NB-IoT communication mode. When the sensing layer detects SF6 leakage, the on-site warning device is started, and a warning signal is sent to the main control room to remind operators to keep away from a converter transformer area and carry out accident handling; the three-layer distributed structure based on the Internet of things adopts an NB-IoT protocol, so that the problems of small transmission capacity, high system power consumption and the like of the traditional Internet of things can be effectively solved, and the defects of short transmission distance and the like of an ad hoc network system can be overcome.
Description
Technical Field
The invention relates to the field of intelligent converter stations, in particular to a converter transformer inflatable sleeve SF6 leak detection system based on an NB-IoT technology.
Background
SF6 gas is widely used in power industry high voltage switches, GIS and transformer bushings because of its good dielectric quenching properties. SF6 gas is itself colorless, odorless, non-toxic, non-flammable and non-combustion-supporting, but if exposed to open flame or high temperatures, decomposes into many very toxic compounds including sulfur dioxide, hydrogen fluoride, hydrogen sulfide, sulfur hexafluoride and other harmful sulfur fluorides. Also, when the SF6 gas content in the air is so high that the oxygen content is < 19.5%, rapid asphyxiation results.
10.2.3 regulations of southern Power grid electric safety work rules: SF6 gas is prevented from leaking to the working area, and the SF6 gas content in the air of the working area must not exceed 1000 muL/L.
Since the converter transformer is a core device in the converter station, and the valve side bushing of the converter transformer is subjected to not only ac voltage but also dc voltage on the converter valve side, SF6 gas is often used as an insulating medium for the valve side bushing. When the SF6 gas leaks, the insulating capability of the sleeve is rapidly reduced, so that the sleeve is punctured, the safe operation of the converter transformer equipment is threatened, and suffocation or decomposition toxic effects on people around the converter transformer can be caused. Especially, IN recent years, considering the noise influence of the converter transformer, BOX-IN devices are arranged around the converter transformer IN a plurality of converter stations, so that the diffusion speed of SF6 gas which is leaked to the atmosphere is reduced, and the operation and maintenance personnel for accident handling are more harmed. Therefore, a SF6 leakage monitoring device for the converter transformer gas-filled casing is needed to be developed.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a converter transformer inflatable sleeve SF6 leakage detection system to detect SF6 leakage in real time.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a leakage detection system for a converter transformer inflatable sleeve SF6 comprises:
the sensing layer comprises sensors which are arranged at distribution points below the multiple converter transformer sleeves, the sensors comprise SF6 sensors and oxygen content sensors, and the SF6 sensor and the oxygen content sensor are respectively used for monitoring and acquiring SF6 content and oxygen content at the distribution points; the system also comprises an analysis module, wherein the analysis module is used for monitoring and acquiring data by an SF6 sensor and an oxygen content sensor, and is also connected with a driving circuit so as to drive an electromagnetic valve to be opened and a suction pump to be started to acquire air composition components at the position where the sensor is installed and send an analysis result to an industrial personal computer;
the transmission layer comprises an industrial personal computer and an NB-IoT module, the industrial personal computer is used for being distributed in the converter transformer square, the industrial personal computer is respectively connected with an infrared detector, an alarm lamp and a loudspeaker, the infrared detector is used for detecting whether an inspector is present near the converter transformer square, when a person is found to be present, a component analysis result of gas is played through the loudspeaker, if SF6 leakage is found, the alarm lamp gives an alarm to remind a converter station operation and detection person to avoid approaching the leakage point; the NB-IoT module is used as a bridging part of the industrial personal computer and the communication network, and connects the industrial personal computer with the communication base station to complete data acquisition and access to the Internet;
and the application layer comprises an operation terminal and is used for analyzing the data uploaded by the transmission layer.
Further, the analysis module also integrates a temperature sensor for detecting the onboard temperature of the analysis module; the analysis module is also connected with an ADC analog-to-digital conversion circuit and used for detecting the input voltage change condition of the analysis module.
Further, the industrial personal computer is also connected with a liquid crystal display screen and is used for displaying the SF6 content and the oxygen content at the distribution point in real time.
Furthermore, the main control chip of the analysis module adopts an MCU of STC12C5A model, the relay selects a Songle relay of SRD-05VDC-SL-C model, and is used for controlling a 2W-50-50 all-copper normally-closed electromagnetic valve, and a current signal of 4-20mA is selected as a control signal of the electromagnetic valve driving circuit.
Further, after the STC12C5A chip is initialized, the STC12C5A sends a data address request to the sensor, if the sensor responds to the request, a response signal is returned to the STC12C5A, and after receiving the response signal, the STC12C5A sequentially sends an opening signal to the solenoid valves of each distribution point; after STC12C5A traverses all the solenoid valves of the distribution points, recording gas component data of the corresponding distribution points, acquiring the state of a register, measuring the input voltage of a data acquisition sub-node through an ADC (analog-to-digital converter), and then opening a replacement solenoid valve to release gas at each distribution point; and finally, returning various data to the main controller of the industrial personal computer for storage and waiting for the next data address request sent by the STC12C5A chip.
Furthermore, the NB-IoT module mainly comprises a BC95 chip and an NB-IoT communication card slot, and a pull-up resistor of 1k omega is connected in front of a serial port so as to keep the stability of the circuit and the integrity of signals and prevent false triggering. (ii) a The BC95 chip is used as an NB-IoT module to communicate with a serial port of the industrial personal computer main chip, and a CoAP protocol is adopted for communication between the BC95 chip and the cloud platform.
The system further comprises a voltage stabilizing module, a power supply supplies power to the analysis module and the industrial personal computer through the voltage stabilizing module, and the voltage stabilizing module adopts an S-1206B30-M3T1G voltage stabilizer; the power supply is also externally connected with four filter capacitors with different capacities of 100uF, 0.1uF, 100pF and 22 pF.
Further, the sensor also comprises a temperature and humidity sensor, and the temperature and humidity sensor adopts a DS18B20 single-line digital temperature and humidity sensor.
Further, the analysis module is communicated with an industrial personal computer in an RS485 bus communication mode.
Further, the system defaults to sleep to reduce power consumption, and the solenoid valves at the analysis module and the gas detection sites on site can be increased at will
Compared with the prior art, the invention has the beneficial effects that:
the system is based on the internet of things technology, a sensing layer is formed by distributing points at a plurality of converter transformer positions, the sensing layer continuously monitors the concentration of SF6 on the site and sends the result to an application layer through a transmission layer. When the sensing layer detects SF6 leakage, the on-site warning device is started, and a warning signal is sent to the main control room to remind operators to keep away from a converter transformer area and carry out accident handling; the system uses a three-layer distributed structure based on the Internet of things, wherein the communication mode adopts NB-IoT protocol. On one hand, the problems of small transmission capacity, high system power consumption and the like of the traditional Internet of things can be effectively solved, and on the other hand, the defects of short transmission distance and the like of an ad hoc network system can be overcome.
Drawings
Fig. 1 is a schematic composition diagram of a converter transformer gas filled bushing SF6 leak detection system according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of the structure of an analysis module;
FIG. 3 is a schematic diagram of the structure of an industrial personal computer;
FIG. 4 is a power supply circuit diagram;
FIG. 5 is a circuit diagram of BC95
FIG. 6 is a schematic diagram of an air pump and its driving circuit
FIG. 7 is a system diagram formed by an STC12 single chip microcomputer;
FIG. 8 is a system diagram of the STM32 single chip microcomputer;
FIG. 9 is a flow chart of the analysis module software;
FIG. 10 is an NB-IoT networking software flowchart;
fig. 11 is a flow chart of a main function of leak detection of the converter transformer gas-filled bushing SF 6.
Detailed Description
Example (b):
in the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted" and "connected" are to be interpreted broadly, e.g., as being either fixedly connected, detachably connected, or integrally connected; the connection can be mechanical connection, electrical connection and signal connection; they may be connected directly or indirectly through intervening media, so to speak, as communicating between the two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art. The technical solution of the present invention is further described below with reference to the accompanying drawings and examples.
Referring to fig. 1, the overall frame of the converter transformer gas-filled bushing SF6 leak detection system provided in this embodiment mainly includes a sensing layer 1, a transmission layer 2, and an application layer 3.
The sensing layer 1 comprises sensors which are arranged at distribution positions below the bushings of the converter transformers of the multiple converter stations, the sensors comprise SF6 sensors and oxygen content sensors, and the SF6 sensors and the oxygen content sensors are respectively used for monitoring and acquiring SF6 content and oxygen content at the distribution positions; the system also comprises an analysis module, wherein the analysis module is used for monitoring and acquiring data of the SF6 sensor and the oxygen content sensor, and is also connected with a driving circuit so as to drive the electromagnetic valve to be opened and the air pump to be started to acquire air composition components at the sensor installation position and send an analysis result to an industrial personal computer.
The transmission layer 2 comprises an industrial personal computer and an NB-IoT module, the industrial personal computer is used for being distributed in a converter transformer square, the industrial personal computer is respectively connected with an infrared detector, an alarm lamp and a loudspeaker, the infrared detector is used for detecting whether an inspector is present near the converter transformer square, when a person is found to be present, a component analysis result of gas is played through the loudspeaker, if SF6 leakage is found, the alarm lamp gives an alarm to remind the converter station operation and detection person not to approach the leakage point; the NB-IoT module is used as a bridging part of the industrial personal computer and the communication network, and the industrial personal computer is connected with the communication base station to finish data acquisition and access to the Internet.
The application layer 3 comprises an operation terminal for analyzing the data uploaded by the transmission layer; specifically, the operation terminal is composed of a workstation located in a main control room of the converter station, so that a series of operations such as analysis and storage of data uploaded by a transmission layer are realized.
Therefore, the system forms a sensing layer by distributing points at a plurality of converter transformer positions based on the technology of the Internet of things, and the sensing layer continuously monitors the concentration of the SF6 on the site and sends the result to an application layer through a transmission layer. When the sensing layer detects SF6 leakage, the on-site warning device is started, and a warning signal is sent to the main control room to remind operators to keep away from a converter transformer area and carry out accident handling; the system uses a three-layer distributed structure based on the Internet of things, wherein the communication mode adopts NB-IoT protocol. On one hand, the problems of small transmission capacity, high system power consumption and the like of the traditional Internet of things can be effectively solved, and on the other hand, the defects of short transmission distance and the like of an ad hoc network system can be overcome.
The structure of the analysis module can be seen in fig. 2, the main control chip adopts an MCU of STC12C5A model, and the relay selects a Songle relay of SRD-05VDC-SL-C model and is used for controlling an all-copper normally-closed electromagnetic valve of 2W-50-50. The selection of the oxygen content sensor adopts a KE-50 oxygen sensor, has the advantages of low power consumption, small influence of carbon dioxide, hydrogen sulfide, hydrogen and other gases in the environment and suitability for being arranged at a converter transformer. The sensor identifies whether personnel can enter a distribution point by monitoring the oxygen content at the converter transformer inflatable sleeve and converting the oxygen content into different voltage values to be provided for the MCU.
In order to prevent the analysis module from short circuit and other problems in the use process, the analysis module is further integrated with AN AN6701S temperature sensor for detecting the onboard temperature of the analysis module, AN ADC analog-to-digital conversion circuit is designed for detecting the input voltage change condition of the analysis module, the problem of a system power supply can be found and solved in time by checking the onboard voltage, and the normal operation of the system is not influenced.
The constitution of industrial computer can see figure 3, and main control unit's core is STM32 main control chip and the peripheral circuit that constitutes minimum system, and STM32 main control chip adopts STM32L431RCT6 of STM32 series, and this chip memory capacity is big, external interface is abundant, can satisfy the system demand. The industrial computer is arranged in the current conversion transformer square, and infrared detector is used for detecting whether polling personnel are present nearby, and when finding that someone is present, the component analysis result of gas is played through the loudspeaker, and if finding that SF6 leaks, the warning lamp can send out an alarm to remind the current conversion station to carry the checking personnel to avoid being close to the leakage point. The liquid crystal screen displays the SF6 and oxygen content for each installation site. In the embodiment, a BC95 module is used as an NB-IoT module to communicate with a serial port of an STM32L431RCT6, the NB-IoT module is used as a bridging part of an industrial personal computer and a communication network, the industrial personal computer is connected with a communication base station, and the function of accessing acquired data to the Internet is achieved.
The power supply circuit design in this system is shown in fig. 4. The system works in an unmanned environment for a long time, and has high requirements on power supply reliability and anti-electromagnetic environment interference capability. The industrial personal computer adopts STM32 with the power supply voltage of 3.3V direct current and NB-IoT chip and other parts need 3.7V direct current, so that two voltages of direct current need to be designed for hardware circuits. And therefore, external influence factors such as electromagnetic interference at the converter transformer are complex, and the reliability of the power supply is particularly important, so that a voltage stabilizing module needs to be designed.
The power supply module supplies power to the MCU after voltage stabilization. The resistors R19 and R20 are responsible for detecting the voltage of the battery and are used for reminding of insufficient power supply when the power supply of the power supply is insufficient. S-1206B30-M3T1G is an ultra-low consumption current low dropout type CMOS voltage regulator, has ultra-low current consumption, and is internally provided with an overcurrent protection circuit, so that the load current can be prevented from exceeding the current capacitance of an output transistor, and the reliability of power supply to a module is effectively guaranteed.
An NB-IoT module in the industrial personal computer is shown in fig. 5, a BC95 is connected with an MCU through a UART interface, data are sent through a TX pin and received through an RX pin, and a BC95 module adopted by the system is connected with a main controller PA10 and a PA6 to realize data receiving and sending.
The NB-IoT module mainly comprises a BC95 chip and an NB-IoT communication card slot. The serial port is connected with a 1k pull-up resistor in front, so that the stability of the circuit and the integrity of signals are maintained, and false triggering is prevented. The P40 and the P41 are respectively a clock pin and a data transmission pin of the SIM, and are connected with the filter capacitors C9 and C10 to filter noise, reduce interference on data transmission and improve the efficiency of data transmission.
Because NB-IoT communication module requires highly to the power stability, this system has given the power external filter capacitance of four kinds of different capacities of 100uF, 0.1uF, 100pF, 22pF, and the filtering voltage spike reduces the power ripple, gets rid of the interference that multiple different wave band frequencies probably produced.
The pump/solenoid control circuit and drive circuit in the analysis module are shown in figure 5. The air pump adopts 12V direct current voltage as a relay power supply, and STC12 triggers the excitation or the loss of the excitation of a relay K1 through the high and low levels of a pin for starting or stopping the air pump to pump air at the installation position of the sensor.
In practical application, the point distribution position is often away from the analysis module position, and voltage signal attenuation is large in remote signal transmission, so that a 4-20mA current signal is selected as a control signal of the electromagnetic valve driving circuit. The DAC end is a voltage input end in the figure, the driving capability is increased through gain generated by an amplifier to output 4-20mA current for the pump to use, and meanwhile, R6 in the figure is a precise pull-down resistor, so that the voltage signal of the DAC end can be converted into a current signal in an equal ratio mode to drive the air pump precisely.
As shown in fig. 6, which is a pin diagram of an STC12C5A chip, after initialization is completed, an STC12C5A sends a data address request to a sensor, if the sensor responds to the request, a response signal is returned to the STC12C5A, and after receiving the response signal, the STC12C5A sequentially sends an opening signal to solenoid valves of each distribution point. After STC12C5A traverses all the solenoid valves of the distribution points, the gas component data of the corresponding distribution points are recorded, the state of the register is obtained, the input voltage of the data acquisition sub-node is measured through the ADC circuit, and then the replacement solenoid valves are opened to release the gas at each distribution point. And finally, returning various data to the main controller of the industrial personal computer for storage and waiting for the next data address request sent by the STC12C5A chip.
STM32L431RCT6 is packaged in a 64 pin format with a pin diagram as shown in fig. 6. STM32L431RCT6 is an ultra-low power consumption controller, based on ARM Cortex-M432 bit RISC kernel, has 64KB SRAM and up to 256KB Flash ROM, the operating frequency is up to 80MHz, the operation is in the temperature range of-40 to 85 ℃, low power consumption, low cost and high reliability.
The software flow chart of the analysis module is shown in fig. 9, the analysis module extracts gas components by opening the electromagnetic valves at the distribution points at regular time, and different distribution points correspond to different address codes. The solenoid valves are sequentially opened and closed from small address codes to large address codes, and finally the solenoid valve of the replacement channel is opened to release the extracted gas. And the analysis module sends the gas analysis condition to the industrial personal computer in an RS485 communication mode.
NB-IoT network access software flow diagram as shown in fig. 10, the industrial personal computer can implement the manipulation of BC35 by executing at (attention) commands. AT commands are an interface standard that has a certain command format and corresponding return values. The command set of the AT command is generally initiated by the AT and terminated by the enter key, where AT + CFUN is a power-on command and AT + CGATT is 1 as a network search command in the flowchart. Regardless of whether the AT command is executed successfully, a corresponding return value should be present. In the system, a CoAP protocol is adopted for communication between the BC95 module and the cloud platform, data sent to a base station by the NB-IoT module can be seen by a user only through an operator network and the IoT platform, the BC95 module in the system uses a China Mobile operator network, and the IoT platform uses a China Mobile OneNet. The BC95-B5 enables interfacing with the OneNET platform by porting SDK (Software development Kit) into STM 32.
A flow chart of a main function of the system is shown in fig. 11, the system defaults to a sleep state to reduce power consumption, the system needs to be initialized all the time, a timer, an internal interrupt, an external interrupt, a port and a serial port before working, and variables defined in the function by data collected by each sensor need to be initialized. After the initialization is completed, the network access state of the BC35 chip needs to be checked, and after the network access is determined to be successful, the data transmission work can be carried out on the base station.
Specifically, above-mentioned sensor still includes temperature and humidity touch sensor, and temperature and humidity sensor adopts DS18B20 single line digital temperature and humidity sensor, and this sensor hardware structure is simple, and it is convenient to install.
The specific working principle of the system is as follows:
after the analysis module arranged at the converter transformer square is initialized, the STC12C5A sends a data address request to the sensor and then sends a starting signal to the corresponding electromagnetic valve and the air suction pump. After STC12C5A traverses the electromagnetic valves of all the distribution points, the air component data of the corresponding distribution points are recorded, the state of the register is obtained, the input voltage of the data acquisition node is measured through the ADC circuit, and then the replacement electromagnetic valve is opened to release the gas at each distribution point so as to acquire the air component at each distribution point next time. The analysis module sends the analysis data to an industrial personal computer on site through an RS485 communication protocol, and the industrial personal computer synchronously sends the gas data to a workstation located in a main control room of the converter station through a BC95 module for monitoring personnel. If the gas data is different, when the SF6 content at the distribution point exceeds 1000ppm, the industrial personal computer at the site can send out audible and visual alarm to remind the operation and inspection personnel of the converter station at the site to keep away from the leakage point, and meanwhile, the external sound box of the workstation positioned in the main control room can send out alarm sound. The infrared detector of the industrial personal computer is used for detecting whether polling personnel are nearby, when people are found to be on site, the component analysis result of the gas is played through the loudspeaker, and the transportation and inspection personnel can also read the components of the gas on site through the liquid crystal screen of the industrial personal computer.
The system defaults to a sleep state to reduce power consumption, and the solenoid valves at the analysis module and the gas detection distribution points on site can be increased at will. The communication between the BC95 module and the cloud platform adopts a CoAP protocol, and data sent to the base station by the NB-IoT module needs to pass through an operator network, so that the problem of overlong transmission distance does not need to be considered. Therefore, the invention can effectively solve the problems of small transmission capacity, high system power consumption and the like of the traditional Internet of things on one hand, and can make up for the defects of short transmission distance and the like of an ad hoc network system on the other hand.
The above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention accordingly, and not to limit the protection scope of the present invention accordingly. All equivalent changes or modifications made in accordance with the spirit of the present disclosure are intended to be covered by the scope of the present disclosure.
Claims (10)
1. A leakage detection system for a converter transformer inflatable sleeve SF6 is characterized by comprising the following components:
the sensing layer comprises sensors which are arranged at distribution points below the multiple converter transformer sleeves, the sensors comprise SF6 sensors and oxygen content sensors, and the SF6 sensor and the oxygen content sensor are respectively used for monitoring and acquiring SF6 content and oxygen content at the distribution points; the system also comprises an analysis module, wherein the analysis module is used for monitoring and acquiring data by an SF6 sensor and an oxygen content sensor, and is also connected with a driving circuit so as to drive an electromagnetic valve to be opened and a suction pump to be started to acquire air composition components at the position where the sensor is installed and send an analysis result to an industrial personal computer;
the transmission layer comprises an industrial personal computer and an NB-IoT module, the industrial personal computer is used for being distributed in the converter transformer square, the industrial personal computer is respectively connected with an infrared detector, an alarm lamp and a loudspeaker, the infrared detector is used for detecting whether an inspector is present near the converter transformer square, when a person is found to be present, a component analysis result of gas is played through the loudspeaker, if SF6 leakage is found, the alarm lamp gives an alarm to remind a converter station operation and detection person to avoid approaching the leakage point; the NB-IoT module is used as a bridging part of the industrial personal computer and the communication network, and connects the industrial personal computer with the communication base station to complete data acquisition and access to the Internet;
and the application layer comprises an operation terminal and is used for analyzing the data uploaded by the transmission layer.
2. The SF6 leak detection system for converter transformer gas filled bushings, as claimed in claim 1, wherein said analysis module further incorporates a temperature sensor for sensing the temperature onboard the analysis module; the analysis module is also connected with an ADC analog-to-digital conversion circuit and used for detecting the input voltage change condition of the analysis module.
3. The converter transformer gas-filled bushing SF6 leak detection system as claimed in claim 1, wherein said industrial personal computer is further connected with a liquid crystal display screen for real-time displaying SF6 content and oxygen content at a distribution point.
4. The SF6 leak detection system for converter transformer gas-filled bushings, as claimed in claim 2, characterized in that the main control chip of the analysis module employs MCU model STC12C5A, the relay selects Songle relay model SRD-05VDC-SL-C, and is used to control 2W-50-50 all-copper normally closed solenoid valve, and selects current signal of 4-20mA as control signal of solenoid valve driving circuit.
5. The SF6 leakage detection system for converter transformer gas-filled bushings as claimed in claim 4, wherein after the STC12C5A chip is initialized, the STC12C5A sends a data address request to the sensor, if the sensor responds to the request, a response signal is returned to the STC12C5A, and after receiving the response signal, the STC12C5A sequentially sends an opening signal to the solenoid valves of each distribution point; after STC12C5A traverses all the solenoid valves of the distribution points, recording gas component data of the corresponding distribution points, acquiring the state of a register, measuring the input voltage of a data acquisition sub-node through an ADC (analog-to-digital converter), and then opening a replacement solenoid valve to release gas at each distribution point; and finally, returning various data to the main controller of the industrial personal computer for storage and waiting for the next data address request sent by the STC12C5A chip.
6. The SF6 leak detection system of converter transformer gas filled bushing as claimed in claim 1, wherein the NB-IoT module is mainly composed of BC95 chip, NB-IoT communication card slot, and the serial port is connected with 1 kOmega pull-up resistor in front to keep the stability of circuit and the integrity of signal, prevent the false triggering; the BC95 chip is used as an NB-IoT module to communicate with a serial port of the industrial personal computer main chip, and a CoAP protocol is adopted for communication between the BC95 chip and the cloud platform.
7. The SF6 leak detection system of converter transformer inflatable bushings according to claims 1-5, characterized in that the system further includes a voltage regulation module, the power supply supplies power to the analysis module and the industrial personal computer through the voltage regulation module, the voltage regulation module employs an S-1206B30-M3T1G voltage regulator; the power supply is also externally connected with four filter capacitors with different capacities of 100uF, 0.1uF, 100pF and 22 pF.
8. The SF6 leak detection system for converter transformer gas filled bushings as claimed in claim 1, wherein the sensors further include a temperature and humidity sensor, the temperature and humidity sensor being a DS18B20 single line digital temperature and humidity sensor.
9. The converter transformer gas filled bushing SF6 leak detection system as claimed in claim 1, wherein said analysis module communicates with an industrial personal computer through RS485 bus communication.
10. The converter transformer gas filled bushing SF6 leak detection system as claimed in claim 1, wherein said system defaults to sleep state to reduce power consumption, and solenoid valves at the analysis module and gas detection sites located on site can be increased at will.
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| CN115541123A (en) * | 2022-11-21 | 2022-12-30 | 昆明北方红外技术股份有限公司 | System and method for testing NECL parameters of gas leak detector |
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