Sulfur hexafluoride gas monitoring alarm device

Abstract

The utility model discloses a sulfur hexafluoride gas monitoring alarm device which comprises a shell, a control unit, a storage unit, a timing unit and an alarm unit are arranged in the shell, the storage unit, the timing unit and the alarm unit are electrically connected with the control unit, and an input interface, an output interface, a nixie tube and a key are arranged on the shell. The control unit comprises a microcontroller, the microcontroller is connected with a sulfur hexafluoride gas density transmitter mounted in high-voltage electrical equipment through an input interface by adopting an RS485 bus, and the transmitter is used for detecting temperature and pressure values of gas and transmitting the temperature and pressure values to the microcontroller; the microcontroller is connected with a main station through an output interface by adopting an RS485 bus, and is used for transmitting the gas temperature and pressure values collected in real time and alarm information to the main station; the control unit is electrically connected with the nixie tube and the keys, the nixie tube is used for displaying temperature and pressure values of gas, and the alarm unit is used for displaying alarm and locking information. According to the utility model, the accurate and real-time monitoring of the SF6 gas safety is realized.

Description

Technical Field

[0001] The utility model belongs to the technical field of gas monitoring, and in particular relates to a sulfur hexafluoride gas monitoring and alarm device. Background Art

[0002] The statements herein merely provide background art related to the present invention and do not necessarily constitute prior art.

[0003] Sulfur hexafluoride gas (SF 6 SF gas is widely used in high voltage electrical equipment. Under normal circumstances, it is an ideal insulating and arc extinguishing medium. However, SF 6 Gas has a serious greenhouse effect. Currently, the power industry has significantly reduced or even banned SF 6 gas to remove SF 6 The impact of SF 6 The gas has poor low temperature resistance. At -40℃ or even -50℃, pure SF 6 The gas will liquefy, causing the high-voltage switchgear to be 6 The gas liquefies and the gas pressure drops, which in turn causes the insulation strength and breaking capacity of the high-voltage switch to decrease. When the gas pressure drops to the switch locking pressure value, the high-voltage switch equipment may stop operating, causing power accidents. However, there is currently no effective alternative to SF 6 A single gas of gas.

[0004] To reduce SF 6 Gas usage, using mixed gas to achieve the same 6 It is a very important research to have insulation and arc extinguishing performance similar to that of gas to meet the requirements of high-voltage equipment in terms of reliability and low temperature resistance. 6 +N 2 and SF 6 +CF 4 The two mixed gases have been applied on-site in high-voltage equipment with good results. To adapt to this application scenario, it is necessary to 6 Gas is monitored in real time to avoid SF 6 Gas exceeds the limit and causes high-voltage switchgear to stop operating or fail. Therefore, there is an urgent need for a 6 Gas monitoring and alarm device. Utility Model Content

[0005] In view of the above problems and defects in the prior art, the utility model provides a sulfur hexafluoride gas monitoring and alarm device, which adopts two-way RS485 communication to collect the temperature and pressure values ​​of the gas in the high-voltage equipment downward, and detects the SF6 in the gas according to the collected data. 6Gas safety monitoring, uploading the collected and monitored data to the main station, realizing SF 6 Accurate real-time monitoring of gas safety ensures safe operation of high-voltage equipment.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] A sulfur hexafluoride gas monitoring and alarm device comprises a rectangular parallelepiped housing, wherein a control unit, a storage unit, a timing unit and an alarm unit are arranged inside the housing, and an input interface, an output interface, a digital tube and a key are arranged on the housing;

[0008] The control unit includes a microcontroller, and the microcontroller is connected to a sulfur hexafluoride gas density transmitter via an input interface using an RS485 bus. The sulfur hexafluoride gas density transmitter is installed in a high-voltage electrical device and is used to detect the temperature and pressure values ​​of the gas in the device and transmit them to the microcontroller; the microcontroller is connected to a main station via an output interface using an RS485 bus and is used to transmit the real-time collected gas temperature and pressure values ​​and alarm information to the main station;

[0009] The control unit is electrically connected to the storage unit, timing unit, alarm unit, digital tube and button respectively. The digital tube is used to display the temperature and pressure value of the gas. The alarm unit includes an alarm LED indicator and a lock LED indicator, which are used to display alarm and lock information respectively.

[0010] According to a further technical solution, the keys include function keys, a plus key, a minus key and a completion key.

[0011] According to a further technical solution, the microprocessor is used to adjust and set the thresholds of temperature and pressure values ​​according to the control instructions generated by key adjustment; the thresholds include alarm thresholds and lock thresholds.

[0012] According to a further technical solution, the storage unit adopts a FLASH storage chip to store the gas temperature and pressure value data collected in real time.

[0013] According to a further technical solution, the timing unit adopts a clock chip, and the clock chip is electrically connected to the microprocessor for timing.

[0014] According to a further technical solution, a power LED indicator light and an operation LED indicator light are also provided on the housing, and both the power LED indicator light and the operation LED indicator light are electrically connected to the microprocessor.

[0015] A further technical solution is that the microprocessor is used to compare the collected gas temperature and pressure values ​​with the set gas temperature threshold and pressure threshold. If the set alarm threshold is exceeded, an alarm instruction is generated and the alarm instruction is sent to the alarm LED indicator light; the alarm LED indicator light is used to light up according to the alarm instruction.

[0016] A further technical solution is that the microprocessor is used to compare the collected gas temperature and pressure values ​​with the preset gas temperature threshold and pressure threshold. If the set locking threshold is exceeded, a locking instruction is generated and the locking instruction is sent to the locking LED indicator; the locking LED indicator is used to light up according to the locking instruction.

[0017] A further technical solution also includes a power supply unit, which is electrically connected to the control unit, the storage unit, the timing unit, the alarm unit, the digital tube, and the button to supply power to the entire device.

[0018] According to a further technical solution, the power supply unit includes a button backup battery, and the button backup battery is electrically connected to the timing unit to supply power to the timing unit.

[0019] Compared with the prior art, the utility model has the following beneficial effects:

[0020] 1. The utility model provides a sulfur hexafluoride gas monitoring and alarm device, which adopts two-way RS485 communication to collect the temperature and pressure values ​​of the gas in the high-voltage equipment downward, and performs SF 6 Safety monitoring of gases and their mixed gases, uploading the collected and monitored data to the main station, realizing SF 6 Accurate real-time monitoring of gas safety ensures safe operation of high-voltage equipment.

[0021] 2. The sulfur hexafluoride gas monitoring and alarm device provided by the utility model can also be used for SF 6 +N 2 , SF 6 +CF 4 etc. including SF 6 The monitoring and alarm of gas mixture can be realized by adjusting the set threshold in the device with buttons. It is simple to operate and has a wide range of applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention.

[0023] Figure 1 It is a schematic diagram of the sulfur hexafluoride gas monitoring and alarm device of the utility model;

[0024] Figure 2 It is a front schematic diagram of the sulfur hexafluoride gas monitoring and alarm device of the utility model;

[0025] Figure 3 This is a schematic diagram of electrical connections of the sulfur hexafluoride gas monitoring and alarm device of the utility model;

[0026] Figure 4 It is a communication schematic diagram of the sulfur hexafluoride gas monitoring and alarm device described in the utility model.

[0027] Among them, 1. Shell, 2. Digital tube, 3. Button. DETAILED DESCRIPTION

[0028] It should be noted that the following detailed descriptions are illustrative and are intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present application belongs.

[0029] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0030] The utility model discloses a sulfur hexafluoride gas monitoring and alarm device, which is applied to high-voltage electrical equipment and can monitor the SF6 in the equipment in real time. 6 The temperature and pressure data of the gas are compared with the self-set threshold value, and an alarm is issued based on the comparison result. Figure 1 As shown, the device comprises a rectangular housing 1, a control unit, a storage unit, a timing unit and a power supply unit are arranged inside the housing 1, and an input interface, an output interface, a digital tube 2 and a key 3 are arranged on the housing. The above device is highly integrated and can be suitable for installation in a compact space.

[0031] Among them, Figure 3As shown, the control unit is electrically connected to the storage unit, the timing unit, the digital tube and the button respectively. The control unit includes a microcontroller. The microcontroller uses the RS485 bus to connect to the sulfur hexafluoride gas density transmitter through the input interface. The sulfur hexafluoride gas density transmitter is installed in the high-voltage electrical equipment to detect the temperature and pressure values ​​of the gas in the equipment, and transmit the detected temperature and pressure values ​​to the microcontroller through the RS485 bus. When the RS485 bus is used for transmission, the data is parsed through the MODBUS private protocol for subsequent data display in the digital tube. When collecting the gas temperature and pressure values ​​in the high-voltage electrical equipment, the gas density transmitter can be directly used for collection. Furthermore, considering that the entire gas in the equipment is a mixed gas containing other gases such as nitrogen, the main gas is still SF 6 Gas, so here generally the gas density transmitter used is usually called sulfur hexafluoride gas density transmitter.

[0032] At the same time, if Figure 4 As shown in the figure, the microcontroller uses the RS485 bus to connect to the main station through the output interface, and transmits the real-time collected gas temperature and pressure values ​​and alarm information to the main station / server / client. The main station / server / client can directly access the proposed monitoring device to indirectly obtain SF 6 The temperature and pressure values ​​collected by the gas density transmitter are transmitted using a standard protocol on the RS485 bus, and the data is divided in detail to cope with different scenarios. Through the above settings, the master station can read the current data without directly interacting with the sensor, which reduces the burden on the master station. In addition, the above design is easy to expand, and the RS485 bus uses hardware isolation, with a long transmission distance and strong anti-interference ability.

[0033] The above-mentioned microprocessor adopts a high-performance embedded MCU as the main control, and parses the gas temperature and pressure values ​​collected by different slave stations through the MODBUS protocol of the RS485 interface. The MODBUS private protocol adopted is highly secure. The microprocessor is equipped with a preset gas density algorithm, which can also convert the collected gas temperature and pressure values, and transmit the converted temperature and pressure values ​​to the digital tube, which displays the values. Among them, the numerical conversion refers to converting the collected pressure value into a pressure value at 20 degrees Celsius and in units of Bar, and converting the collected temperature value into a temperature value in units of Celsius.

[0034] Furthermore, the above device is also provided with an alarm unit electrically connected to the control unit, such as Figure 2As shown, the alarm unit includes an alarm LED indicator and a lockout LED indicator, and the alarm LED indicator and the lockout LED indicator are electrically connected to a microprocessor. The microprocessor is used to compare the collected gas temperature and pressure values ​​with preset gas temperature thresholds and pressure thresholds. If the set alarm threshold or lockout threshold is exceeded, an alarm instruction or a lockout instruction is generated, and the alarm instruction is sent to the alarm LED indicator or the lockout instruction is sent to the lockout LED indicator. The alarm LED indicator and the lockout LED indicator light up according to the alarm instruction and the lockout instruction respectively, so as to remind the staff that there is an abnormal situation at this time.

[0035] Furthermore, the device proposed in this embodiment includes four different buttons, namely, a function button "FUN", a plus button "+", a minus button "-" and an completion button "ESC". The thresholds are adjusted by the above four different buttons, and the microprocessor is used to adjust and set the thresholds of the temperature and pressure values ​​according to the control instructions generated by the button adjustment. Specifically, long press the function button "FUN" to enter the setting interface, short press the function button "FUN" to select the temperature threshold or pressure threshold setting, short press the plus button "+" or the minus button "-" to select the setting number to increase or decrease, and when the setting is completed, press the completion button "ESC" to confirm and exit, and return to the normal display interface. Through this adjustment method, the alarm thresholds of the temperature and pressure values ​​can be set, such as setting the pressure value to lock when it is lower than 1.1 bar, and alarm when it is lower than 1.2 bar.

[0036] As another implementation, the gas corresponding to the above-mentioned detected gas temperature and pressure values ​​may also be N 2 and / or CF 4 Gases and SF 6 Mixed gas after gas mixing. When the type of gas monitored by the transmitter changes or the mixing ratio changes, it is only necessary to adjust the threshold setting of the monitoring alarm device to achieve the SF 6 Gas abnormality monitoring. For example, if all the gas in the equipment is SF 6 Gas, then set the temperature and pressure thresholds to A. If the collected value exceeds the threshold A, it is considered that SF 6 The gas exceeds the limit and an alarm is triggered; if the gas in the equipment is SF 6 Gas and N 2 If the collected value exceeds the threshold value B, it is considered that the SF 6 The gas exceeds the limit and an alarm is triggered.

[0037] Furthermore, the storage unit uses a FLASH memory chip, which can store the real-time collected gas temperature and pressure data, so as to facilitate the subsequent export and analysis of the data. In this embodiment, a large-capacity FLASH memory chip is used, which can save more than 10,000 pieces of data without losing data in case of power failure.

[0038] Furthermore, the timing unit adopts a high-precision clock chip, which is electrically connected to the microprocessor for timing. The microprocessor obtains the gas temperature and pressure values ​​in real time at set time intervals based on the timing.

[0039] Furthermore, the above device also includes a power supply unit, which is electrically connected to the control unit, storage unit, timing unit, alarm unit, digital tube, and key to power the entire device. The power supply unit includes a button backup battery, which is electrically connected to the timing unit to power the timing unit, and even if the power is off, the timing unit can be accurately routed and the clock can be accurate. The power supply unit also includes a storage battery for powering the entire device. Further, the power supply unit is electrically connected to an external power supply to power the entire device.

[0040] Furthermore, a power LED indicator and an operation LED indicator are also provided on the shell of the above-mentioned device, and the power LED indicator and the operation LED indicator are electrically connected to the microprocessor. When the entire device is powered on, the microprocessor sends a power-on instruction to the power LED indicator, and the power LED indicator lights up according to the power-on instruction; when the entire device starts to run, that is, when the microprocessor collects and monitors data normally, the microprocessor sends a normal operation instruction to the operation LED indicator, and the operation LED indicator lights up according to the normal operation instruction.

[0041] The sulfur hexafluoride gas monitoring and alarm device proposed in the utility model adopts two-way RS485 communication to collect the temperature and pressure values ​​of the gas in the high-pressure equipment downward, and performs SF 6 Safety monitoring of gases and their mixed gases, uploading the collected and monitored data to the main station, realizing SF 6 Accurate real-time monitoring of gas safety ensures safe operation of high-voltage equipment.

[0042] Although the above describes the specific implementation methods of the utility model in combination with the accompanying drawings, it is not intended to limit the scope of protection of the utility model. Technical personnel in the relevant field should understand that on the basis of the technical solution of the utility model, various modifications or deformations that can be made by technical personnel in this field without creative work are still within the scope of protection of the utility model.

Claims

1. A sulfur hexafluoride gas monitoring and alarm device, Its characteristics are: It comprises a rectangular parallelepiped housing, wherein a control unit, a storage unit, a timing unit and an alarm unit are arranged inside the housing, and an input interface, an output interface, a digital tube and buttons are arranged on the housing; The control unit includes a microcontroller, and the microcontroller is connected to a sulfur hexafluoride gas density transmitter via an input interface using an RS485 bus. The sulfur hexafluoride gas density transmitter is installed in a high-voltage electrical device and is used to detect the temperature and pressure values ​​of the gas in the device and transmit them to the microcontroller; the microcontroller is connected to a main station via an output interface using an RS485 bus and is used to transmit the real-time collected gas temperature and pressure values ​​and alarm information to the main station; The microprocessor uses a high-performance embedded MCU as the main control, and parses the gas temperature and pressure values ​​collected by different slave stations through the MODBUS protocol of the RS485 interface; the microprocessor is equipped with a preset gas density algorithm to convert the collected gas temperature and pressure values, and transmit the converted temperature and pressure values ​​to the digital tube, which displays the values; The control unit is electrically connected to the storage unit, the timing unit, the alarm unit, the digital tube and the button respectively. The digital tube is used to display the temperature and pressure value of the gas. The alarm unit includes an alarm LED indicator and a locking LED indicator, which are used to display the alarm and locking information respectively. The buttons include function buttons, plus buttons, minus buttons and completion buttons, and the threshold is adjusted by pressing different buttons; The microprocessor is used to adjust and set the thresholds of temperature and pressure values ​​according to the control instructions generated by key adjustment; the thresholds include alarm thresholds and lock thresholds; The timing unit adopts a clock chip, and the clock chip is electrically connected to the microprocessor for timing; The housing is also provided with a power LED indicator light and an operation LED indicator light, and the power LED indicator light and the operation LED indicator light are both electrically connected to the microprocessor; The storage unit uses a FLASH storage chip to store the real-time collected gas temperature and pressure value data, which is convenient for subsequent data export and analysis; The power supply unit includes a button backup battery, which is electrically connected to the timing unit and is used to supply power to the timing unit.

2. The sulfur hexafluoride gas monitoring and alarm device according to claim 1, Its characteristics are: The microprocessor is used to compare the collected gas temperature and pressure values ​​with the set gas temperature threshold and pressure threshold. If the set alarm threshold is exceeded, an alarm instruction is generated and the alarm instruction is sent to the alarm LED indicator; the alarm LED indicator is used to light up according to the alarm instruction.

3. The sulfur hexafluoride gas monitoring and alarm device according to claim 1, Its characteristics are: The microprocessor is used to compare the collected gas temperature and pressure values ​​with the preset gas temperature threshold and pressure threshold. If the set locking threshold is exceeded, a locking instruction is generated and the locking instruction is sent to the locking LED indicator light; the locking LED indicator light is used to light up according to the locking instruction.

4. The sulfur hexafluoride gas monitoring and alarm device according to claim 1, Its characteristics are: It also includes a power supply unit, which is electrically connected to the control unit, the storage unit, the timing unit, the alarm unit, the digital tube, and the key to supply power to the entire device.

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