A high-voltage electrical equipment gas density detection device and detection method

Abstract

The application discloses a high-voltage electrical equipment gas density detection device and detection method, comprising: a first temperature measurement component is arranged in a gas path channel or outside the gas path channel communicated with the high-voltage electrical equipment, a pressure detection component is arranged in the gas path channel, and real-time temperature values of the insulation gas in the gas path channel or outside the gas path channel on the shell and real-time gas pressure values of the high-voltage electrical equipment are obtained respectively; an auxiliary temperature measurement module is arranged in the gas path channel or outside the gas path channel on the shell, and a temperature value in the module after heat conduction is obtained; an operation controller calculates a first gas density value based on the real-time temperature values and the real-time gas pressure values, and calculates a second gas density value based on the temperature value in the module and the real-time gas pressure values, and the standard deviation values of the first gas density value and the second gas density value in a preset period are calculated respectively, and the gas density value corresponding to the smaller standard deviation value is selected as the actual density value of the insulation gas in the high-voltage electrical equipment.

Description

Technical Field

[0001] This invention relates to the field of power equipment technology, and in particular to a gas density detection device and method for high-voltage electrical equipment. Background Technology

[0002] SF6 gas, as a high-performance insulating medium, is widely used inside high-voltage electrical equipment such as GIS for arc extinguishing and insulation. The arc-extinguishing and insulation properties of SF6 gas are related to its density. When gas leakage occurs, causing a decrease in the density of SF6 gas inside the high-voltage electrical equipment, its arc-extinguishing and insulation properties will also decrease. This can lead to high-voltage arc breakdown inside the SF6 electrical equipment, and the short-circuit current will damage the high-voltage electrical equipment, causing serious economic losses and social impact.

[0003] Currently, remote-controlled SF6 gas density transmitters used for online monitoring of SF6 gas inside high-voltage electrical equipment do not accurately reflect the actual density of the SF6 gas inside the equipment. In practical applications, since the temperature of the SF6 gas inside the high-voltage electrical equipment cannot be directly measured, it is indirectly measured through a temperature sensor in a remote-controlled SF6 gas density transmitter installed outside the equipment. Simultaneously, the density transmitter measures the pressure inside the high-voltage electrical equipment, and the density of the SF6 gas is calculated using a mathematical model.

[0004] Both the remote-controlled SF6 gas density transmitter and the high-voltage electrical equipment are exposed to constantly changing ambient temperatures. Due to their different heat capacities, the changing ambient temperature, after being transmitted to the SF6 gas inside both the transmitter and the equipment, results in different real-time temperature values. Furthermore, the temperature change curves differ in phase, amplitude, and smoothness. Reflected in gas pressure, the monitored pressure change of the SF6 gas inside the high-voltage electrical equipment always lags behind the temperature curve detected by the remote-controlled SF6 gas density transmitter. This lag is influenced by various factors, including the rate of change of ambient temperature, the installation location of the density transmitter, the gas capacity of the high-voltage electrical equipment, and the size of the equipment itself.

[0005] In other words, due to the asynchronous changes in pressure and temperature, the gas density value calculated by remote-type SF6 and other insulating gas density transmitters using a pressure-temperature mathematical model is not the actual density of the gas inside high-voltage electrical equipment. This difference also varies with pressure and temperature changes. When the difference is large, the remote-type gas density transmitter will generate false alarms, interfering with normal power system maintenance.

[0006] In general, due to changes in ambient temperature, the pressure changes of the gas inside high-voltage electrical equipment are not synchronized with the gas temperature changes indirectly detected by remote gas density transmitters. This causes the gas density value calculated by the pressure-temperature mathematical model to fail to accurately reflect the actual density of the insulating gas inside the high-voltage electrical equipment. This discrepancy between the calculated and actual values ​​will lead to false alarms from the remote gas density transmitter, thus interfering with normal power system maintenance. Misjudgments can also endanger the safety of power system equipment. Therefore, ensuring that remote gas density transmitters accurately reflect the density of the insulating gas inside high-voltage electrical equipment has become an urgent problem to be solved. Summary of the Invention

[0007] The purpose of this invention is to provide a gas density detection device and method for high-voltage electrical equipment. By acquiring the real-time gas temperature value of the first temperature measuring component and the internal temperature values ​​of several modules in the auxiliary temperature measuring module, and combining them with the real-time gas pressure value, the corresponding density value and its standard deviation are calculated. The gas density value with the smallest standard deviation is selected as the actual density value of the gas in the high-voltage electrical equipment. This method has the advantages of high gas density detection accuracy and fast detection speed.

[0008] To solve the above-mentioned technical problems, the first aspect of the present invention provides a gas density detection device for high-voltage electrical equipment, used to detect the density of insulating gas in high-voltage electrical equipment, comprising: a housing, a first temperature measuring component, a pressure detection component, an auxiliary temperature measuring module, and a computing controller;

[0009] The first temperature measuring component is disposed in the gas passage connected to the high-voltage electrical equipment or outside the gas passage on the housing. The pressure detection component is disposed in the gas passage connected to the high-voltage electrical equipment. The component acquires the real-time temperature value of the insulating gas in the gas passage or outside the gas passage on the housing and the real-time gas pressure value in the high-voltage electrical equipment, and sends them to the computing controller.

[0010] The auxiliary temperature measurement module is located in the air passage connected to the high-voltage electrical equipment or outside the air passage on the housing. It acquires the temperature value inside the module after heat conduction through the auxiliary temperature measurement module and sends it to the computing controller.

[0011] The operation controller calculates a first gas density value based on the real-time temperature value and the real-time gas pressure value, and calculates a second gas density value based on the temperature value and the real-time gas pressure value within the module. It calculates the standard deviation of the first gas density value and the second gas density value within a preset period, and selects the gas density value corresponding to the smaller standard deviation value as the actual density value of the insulating gas in the high-voltage electrical equipment.

[0012] Furthermore, the auxiliary temperature measurement module includes: a plurality of second temperature detection components;

[0013] The plurality of second temperature detection components are respectively used to acquire the temperature value within the module of the environment in which the high-voltage electrical equipment is located;

[0014] The arithmetic controller receives temperature values ​​within the modules obtained by the plurality of second temperature detection components, and calculates a plurality of second gas density values ​​and their standard deviations corresponding to the plurality of second temperature detection components in combination with the real-time gas pressure value. The smaller of the standard deviation of the plurality of second gas density values ​​and the standard deviation of the first gas density value is obtained as the actual density value of the insulating gas in the high-voltage electrical equipment.

[0015] Furthermore, each of the plurality of second temperature detection components includes: a second thermal buffer unit and a second temperature sensor disposed therein;

[0016] The second temperature sensor acquires the temperature value inside the module after the ambient temperature around the high-voltage electrical equipment has been conducted through the second thermal buffer unit.

[0017] The operational controller is electrically connected to the second temperature sensor and receives the temperature value within the module detected by the second temperature sensor.

[0018] Furthermore, the second heat buffer unit is made of the same material but has a different thickness; or,

[0019] The second heat buffer unit is made of a different material but has the same thickness; or,

[0020] The second thermal buffer unit is made of a different material and has a different thickness.

[0021] Furthermore, the second thermal buffer unit includes: a second heat storage component and a second thermal resistance component;

[0022] in,

[0023] The second heat storage component and the second thermal resistance component in any two of the second temperature detection assemblies are made of the same material but have different thicknesses; or,

[0024] The materials of the second heat storage component and the second thermal resistance component in any two of the second temperature detection components are different, but their thicknesses are the same; or,

[0025] The materials and thicknesses of the second heat storage component and the second thermal resistance component in any two of the second temperature detection components are different.

[0026] Furthermore, each of the several second temperature measuring components is a digital temperature sensor, an analog temperature sensor, or a sensor assembly with different temperature response speeds.

[0027] Furthermore, the pressure detection component includes: a digital signal pressure sensor or an analog signal pressure sensor;

[0028] The operational controller receives the digital signal pressure value from the digital signal pressure sensor or the analog signal pressure value from the analog signal pressure sensor, and then converts it into a corresponding digital pressure signal via an A / D converter.

[0029] Furthermore, the high-voltage electrical equipment gas density detection device further includes: a gas path assembly, the gas path assembly including: a gas path connector and / or a gas path pipeline;

[0030] The gas pipeline is connected to the gas interface of the high-voltage electrical equipment through the gas connector;

[0031] The pressure detection component is disposed in the gas pipeline, and the first temperature measuring component is disposed in the gas pipeline or outside the gas pipeline on the housing.

[0032] Accordingly, a second aspect of the present invention provides a method for detecting the gas density of high-voltage electrical equipment, which detects the insulating gas in high-voltage electrical equipment based on the above-mentioned high-voltage electrical equipment gas density detection device, including the following steps:

[0033] The real-time temperature value of the insulating gas in the gas passage of the high-voltage electrical equipment or the gas outside the gas passage on the shell is obtained based on the first temperature measuring component, and the real-time gas pressure value of the insulating gas in the gas passage of the high-voltage electrical equipment is obtained based on the pressure detection component and sent to the computing controller.

[0034] The auxiliary temperature measurement module acquires the temperature value of the surrounding environment of the high-voltage electrical equipment at the housing after heat conduction through the auxiliary temperature measurement module, and sends it to the computing controller; the computing controller acquires a first gas density value corresponding to the real-time gas temperature value and a second gas density value corresponding to the temperature value inside the module, calculates the standard deviation of the first gas density value and the second gas density value within a preset period, and selects the gas density value corresponding to the smaller standard deviation value as the actual density value of the insulating gas inside the high-voltage electrical equipment.

[0035] Further, after selecting the gas density value corresponding to the smaller standard deviation value as the actual density value of the insulating gas inside the high-voltage electrical equipment, the process includes:

[0036] The actual density value of the insulating gas inside the high-voltage electrical equipment is compared to whether it is greater than the leakage alarm density threshold.

[0037] If the actual density value is greater than the leakage alarm density threshold, then the density value of the insulating gas inside the high-voltage electrical equipment is determined to meet the requirements.

[0038] If the actual density value is less than or equal to the gas leakage alarm density threshold, it is determined that the insulating gas in the high-voltage electrical equipment has leaked, and a gas leakage alarm signal is issued.

[0039] Furthermore, after selecting the gas density value corresponding to the smaller standard deviation value as the actual density value of the insulating gas inside the high-voltage electrical equipment, the method further includes:

[0040] The actual density value of the insulating gas inside the high-voltage electrical equipment is compared with the replenishment gas density threshold.

[0041] If the actual density value is greater than the gas replenishment density threshold, then the density value of the insulating gas inside the high-voltage electrical equipment is determined to meet the requirements.

[0042] If the actual density value is less than or equal to the gas replenishment density threshold, it is determined that the insulating gas in the high-voltage electrical equipment has leaked, and a gas replenishment warning signal is issued.

[0043] The above-described technical solutions of the embodiments of the present invention have the following beneficial technical effects:

[0044] By acquiring the real-time gas temperature value of the first temperature measuring component and the internal temperature values ​​of several modules in the auxiliary temperature measuring module, and combining them with the real-time gas pressure value, the corresponding density value and its standard deviation are calculated. The gas density value with the smallest standard deviation is selected as the actual density value of the gas in the high-voltage electrical equipment. This method has the advantages of high gas density detection accuracy and fast detection speed. Attached Figure Description

[0045] Figure 1 This is a schematic diagram of the principle of the gas density detection device for high-voltage electrical equipment provided in an embodiment of the present invention;

[0046] Figure 2 This is a schematic diagram of the principle of the second temperature detection component provided in an embodiment of the present invention;

[0047] Figure 3 This is a schematic diagram of the system architecture of the gas density detection device for high-voltage electrical equipment provided in an embodiment of the present invention;

[0048] Figure 4 This is a flowchart of a gas density detection method for high-voltage electrical equipment provided in an embodiment of the present invention.

[0049] Figure label:

[0050] 1. Gas density detection device; 11. Operational controller; 12. Power supply module; 13. Communication module; 14. Data storage device; 15. Pressure detection component; 16. First temperature measurement component; 17. Second temperature detection component; 171. Second heat storage component; 172. Second thermal resistance component; 173. Second fixing component; 174. Second temperature sensor; 18. Housing; 191. Gas pipeline; 192. Gas connector; 2. High-voltage electrical equipment; 21. Gas interface; 3. Communication concentrator; 4. Monitoring server. Detailed Implementation

[0051] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to specific embodiments and the accompanying drawings. It should be understood that these descriptions are merely exemplary and not intended to limit the scope of the invention. Furthermore, descriptions of well-known structures and techniques are omitted in the following description to avoid unnecessarily obscuring the concept of the invention.

[0052] Please refer to Figure 1 The first aspect of the present invention provides a gas density detection device 1 for high-voltage electrical equipment, used to detect the density of insulating gas in high-voltage electrical equipment 2, comprising: a housing 18, a first temperature measuring component 16, a pressure measuring component 15, an auxiliary temperature measuring module and a computing controller 11. The first temperature measuring component 16 is located in the gas passage connected to the high-voltage electrical equipment 2 or outside the gas passage on the housing 18. The pressure measuring component 15 is located in the gas passage connected to the high-voltage electrical equipment 2. It acquires the real-time temperature value of the insulating gas in the gas passage or outside the gas passage on the housing 18 and the real-time gas pressure value in the high-voltage electrical equipment 2, and sends them to the computing controller 11. The auxiliary temperature measuring module is located in the gas passage connected to the high-voltage electrical equipment 2 or outside the gas passage on the housing 18. It acquires the temperature value inside the module after heat conduction through the auxiliary temperature measuring module and sends it to the computing controller 11. The computing controller 11 calculates the first gas density value based on the real-time temperature value and the real-time gas pressure value, and calculates the second gas density value based on the temperature value inside the module and the real-time gas pressure value. It calculates the standard deviation of the first gas density value and the second gas density value within a preset period and selects the gas density value corresponding to the smaller standard deviation value as the actual density value of the insulating gas inside the high-voltage electrical equipment (2).

[0053] In the above embodiments, the insulating gas includes, but is not limited to, various insulating gases such as SF6 gas, SF6 / N2 mixture, C4F7N mixture, and dry air. High-voltage electrical equipment includes electrical equipment with voltage levels of 10kV and above. The gas density detection device includes, but is not limited to, gas density relays, gas density transmitters (sensors), mechatronic density detection devices, and electronic density detection devices.

[0054] Optionally, in this invention, the calculation of the standard deviation of the first gas density value and the second gas density value within a preset period and the selection of the smaller standard deviation value can be replaced by one of the following methods: 1) Calculate the average value of the first gas density value or the second gas density value within the preset period, and the first gas density value or the second gas density value closest to the average value is the actual density value; 2) Calculate the fluctuation value of the first gas density value and / or the second gas density value within the preset period, and the one with the smallest fluctuation value is the actual density value; 3) Calculate the average value of the first gas density value and the second gas density value within the preset period, and the first gas density value and the second gas density value closest to the average value are the actual density value.

[0055] Each of the several second temperature sensing components 17 has a different temperature response speed; that is, the second temperature sensors 174 react to the ambient temperature at different speeds, with some being faster and others slower. The response speed of the second temperature sensors 174 to temperature changes is different from that of the first temperature sensing component 16. The purpose is to match one of the temperature sensors so that it can change synchronously with the temperature inside the electrical equipment's air chamber as the ambient temperature changes.

[0056] The core of the aforementioned optional method is to obtain the calculated actual density value P inside a high-voltage electrical device by calculating the first gas density value and / or the second gas density value. 计算 Actual density value P 计算 Its characteristic is that its fluctuation value is minimal when there is no leakage; the first gas density value or the second gas density value is closest to the actual density value P. 计算 This can be used as the actual density value of the gas inside high-voltage electrical equipment.

[0057] When the first temperature measuring component 16 and the auxiliary temperature measuring module measure the temperature of the insulating gas in the high-voltage electrical equipment 2, within a certain time range, different gas density values ​​and their corresponding standard deviations are calculated by collecting different actual temperature values ​​and pressure values ​​from the pressure sensor. The temperature value corresponding to the smallest standard deviation value is closest to the actual temperature of the insulating gas in the high-voltage electrical equipment 2. The principle is that when there is no gas leakage in the high-voltage electrical equipment 2, or the gas leakage rate is very low, the density value of the insulating gas inside the high-voltage electrical equipment 2 remains almost unchanged within a short time range. The smaller the standard deviation of the calculated density value, the more synchronous the measured temperature fluctuation is with the pressure fluctuation of the insulating gas. That is, the pressure change of the gas is entirely caused by the temperature change. The temperature value at this time is close to the statistical average value of the actual temperature of the insulating gas inside the high-voltage electrical equipment 2, and best represents the actual temperature value of the insulating gas.

[0058] The operational controller 11 is equipped with an unsteady-state heat transfer algorithm model, which is used to calculate the unsteady-state heat transfer process and parameters of the high-voltage electrical equipment 2 and its internal insulating gas. Based on the actual gas pressure value collected by the pressure sensor and combined with the real-time gas temperature value collected by the first temperature measuring component 16, a first gas density value corresponding to the real-time gas temperature value is calculated; it is also combined with one or more module internal temperature values ​​obtained by the auxiliary temperature measuring module to calculate one or more corresponding second gas density values; then the standard deviation of the above-obtained multiple gas density values ​​is calculated, and the temperature value corresponding to the smallest standard deviation value is selected as the actual temperature value of the insulating gas inside the high-voltage electrical equipment 2, and the corresponding gas density value is the actual density value of the insulating gas inside the high-voltage electrical equipment 2.

[0059] Specifically, the first temperature measuring component 16 includes a first temperature sensor, a first temperature measuring wire, and a first temperature measuring fixture. The first temperature measuring component 16 is disposed in the gas path channel that is in direct contact with the insulating gas, or it is disposed inside or outside the housing 18 of the gas density monitoring device, close to the insulating gas pressure detection of the high-voltage electrical equipment 2, so that the measured temperature is close to the true temperature of the insulating gas. The auxiliary temperature measuring module is directly disposed inside the housing of the gas density monitoring device, close to the gas path channel, or disposed in the gas path channel.

[0060] In one specific embodiment of the present invention, the auxiliary temperature measurement module includes: a plurality of second temperature measurement components 17; the plurality of second temperature measurement components 17 are respectively used to acquire the temperature value inside the module of the environment where the high-voltage electrical equipment 2 is located; the arithmetic controller 11 receives the temperature values ​​inside the module acquired by the plurality of second temperature measurement components 17 respectively, and calculates a plurality of second gas density values ​​and their standard deviation values ​​corresponding to the plurality of second temperature measurement components 17 in combination with the real-time gas pressure value, and obtains the smaller of the standard deviation value of the plurality of second gas density values ​​and the standard deviation value of the first gas density value as the actual density value of the insulating gas inside the high-voltage electrical equipment 2.

[0061] When measuring the temperature value inside the auxiliary temperature measuring module after heat conduction, the auxiliary temperature measuring module can be set in the gas path channel or outside the gas path, and its corresponding temperature sensor can be set at any suitable location on the auxiliary temperature measuring module.

[0062] For details, please refer to Figure 2The second temperature measuring component 17 includes a second thermal buffer unit and a second temperature sensor 174 disposed therein. The second temperature sensor 174 acquires the temperature value inside the module after the ambient temperature around the high-voltage electrical equipment 2 has been conducted through the second thermal buffer unit. The thermal inertia index of the second thermal buffer unit among the plurality of second temperature measuring components 17 is similar to the thermal inertia index of the insulating gas inside the high-voltage electrical equipment 2. The operational controller 11 is electrically connected to the second temperature sensor 174 and receives the temperature value inside the module detected by the second temperature sensor 174. Optionally, the second temperature measuring component 17 further includes a second fixing component 173 disposed outside the second thermal buffer unit.

[0063] In particular, in order to adapt to the different unsteady heat transfer parameters of different high-voltage electrical equipment 2 and their insulating gases in actual engineering, multiple second temperature measuring components 17 can be set to more accurately approximate the unsteady heat transfer parameters of the high-voltage electrical equipment 2 and obtain insulating gas density data that is closer to the actual value.

[0064] Furthermore, the thermal inertia indexes of the second thermal buffer units in the plurality of second temperature measuring components 17 are all different. Optionally, the second thermal buffer units are made of the same material but have different thicknesses; or, the second thermal buffer units are made of different materials but have the same thickness; or, the second thermal buffer units are made of different materials but have different thicknesses.

[0065] Furthermore, the second thermal buffer unit includes: a second heat storage component 171 and a second thermal resistance component 172.

[0066] In order to achieve different thermal inertia indices for the second thermal buffer units in several second temperature measuring components 17, one of the following three implementation methods can be adopted to achieve different thermal inertia indices for each second thermal buffer unit.

[0067] One is that the materials of the second heat storage component 171 and the second thermal resistance component 172 in any two second temperature measuring components 17 are the same, but their thicknesses are different.

[0068] Secondly, the materials of the second heat storage component 171 and the second thermal resistance component 172 in any two second temperature measuring components 17 are different, but their thicknesses are the same.

[0069] Thirdly, the materials and thicknesses of the second heat storage component 171 and the second thermal resistance component 172 in any two second temperature measuring components 17 are different.

[0070] Furthermore, each temperature sensor 174 in the plurality of second temperature sensing components 17 of this invention has a different response speed to temperature changes; specifically, the temperature sensor can be an analog temperature sensor or a digital temperature sensor, as long as each temperature sensor has a different response speed to temperature changes, the requirements are met. For example, the analog temperature sensor can be a PT100 type sensor with a response time of 0.1s; the digital temperature sensor can be a DS18B20 type sensor with a response time of 0.3s; and the sensor assembly can be a SIN-R200T temperature sensor assembly with a longer response time.

[0071] Furthermore, the aforementioned temperature sensors can be further categorized into one or more of the following: integrated chips, thermocouples, thermistors, optical fibers, MEMS, infrared sensors, and lasers. Specifically, integrated chips can be analog or digital; thermocouples can be S-type, B-type, E-type, K-type, R-type, J-type, or T-type; and thermistors can be PTC or NTC type. The aforementioned thermal resistance components can be high-thermal-resistance components formed from materials with low thermal conductivity, or they can be inorganic or organic materials. Inorganic materials include vacuum insulation panels, aerogels, and foamed ceramics, while organic materials include polyurethane and sponge rubber.

[0072] The aforementioned heat storage components are heat storage components formed from materials with a high heat storage coefficient, and can be organic materials, inorganic materials, or composite materials.

[0073] The number of layers in the second heat storage component 171 and the second thermal resistance component 172 surrounding the second temperature sensor 174 in the second temperature measuring assembly 17 can be increased, so that the thermal inertia index of the second thermal buffer unit is more in line with that of the high voltage circuit breaker.

[0074] Because the temperature sensor is located in a second thermal buffer unit with different thermal inertia indices, the acquired temperature curve lags behind the actual ambient temperature curve due to diurnal variations. The peak and trough amplitudes of the acquired temperature curve are also reduced. Due to the influence of heat capacity, the instantaneous impact of ambient temperature on the acquired temperature is also reduced, resulting in a smoother temperature curve. This temperature data curve acquired by the temperature sensor is close in phase to the pressure value curve of the insulating gas inside the high-voltage electrical equipment 2 acquired by the pressure sensor. Because of the influence of the overall heat capacity and thermal resistance of the high-voltage electrical equipment 2 and its insulating gas on heat transfer, the temperature value acquired by the temperature sensor is also close to the temperature value of the insulating gas inside the high-voltage electrical equipment 2. In the sealed cavity of the high-voltage electrical equipment 2, the increase or decrease in insulating gas pressure is caused by the increase or decrease in gas temperature. Therefore, when the phase of the temperature curve acquired by the temperature sensor is close to the pressure curve of the pressure sensor, the temperature value acquired by the temperature sensor is also close to the actual temperature value of the insulating gas in the sealed cavity of the high-voltage electrical equipment 2.

[0075] Specifically, the pressure detection component 15 includes: a digital signal pressure sensor or an analog signal pressure sensor; the arithmetic controller 11 receives the digital signal pressure value from the digital signal pressure sensor or the analog signal pressure value from the analog signal pressure sensor and then converts it into a corresponding digital pressure signal via an AD converter.

[0076] The pressure sensors in the pressure detection assembly 15 include strain gauge, piezoresistive, capacitive, piezoelectric, inductive, Hall effect, eddy current, vibrating wire, fiber optic, diffused silicon, or MEMS pressure sensors. The pressure sensor may also be a pressure sensor assembly that integrates temperature measurement and communication functions.

[0077] Preferably, the pressure sensor is a diffused silicon pressure sensor.

[0078] Furthermore, the high-voltage electrical equipment gas density detection device 1 also includes a gas path assembly, which includes a gas path connector 191 and / or a gas path pipe 192; the gas path pipe 192 is connected to the gas path interface 21 of the high-voltage electrical equipment 2 through the gas path connector 191; a pressure detection component 15 is disposed in the gas path pipe 192, and a first temperature measuring component 16 is disposed in the gas path pipe 192 or outside the gas path pipe 192 on the housing 18. The gas density detection device is connected to the gas path interface 21 of the high-voltage electrical equipment 2 through the gas path connector 191 to achieve gas path connectivity.

[0079] In addition, the technical solution of the present invention also includes: a power module 12, a communication module 13, and a data storage device 14.

[0080] The power module 12 includes: AC / DC converter, DC-DC converter, transformer, linear power supply chip, switching power supply chip, battery, and photoelectric converter. Preferably, the power module 12 converts the DC10 to DC36V voltage input through the electrical connection terminals into DC5V or DC3.3V for use by the internal circuitry of the device.

[0081] The communication module 13 is connected to the arithmetic controller 11, sending various temperature, pressure, and density data, along with corresponding calculation results, to the monitoring server 4 and data storage 14 for storage. Specifically, the communication module 13 includes RS232, RS485, CAN, USB, Ethernet, EtherCAT, ProfiBus, HART, fiber optic, TTL, I2C, or SPI communication; it can also be wireless communication such as WIFI, LoRa, Bluetooth, ZigBee, 2G / 3G / 4G / 5G, infrared, or acoustic communication. Preferably, the communication module 13 uses RS485 half-duplex communication, and the transmission protocol adopts MODBUS.

[0082] Optionally, the data storage device 14 may include RAM, ROM, FLASH, SD, SSD, or hard disk.

[0083] like Figure 3 As shown, several high-voltage electrical equipment gas density detection devices 1 are connected to the monitoring server 4 via communication concentrator 3, forming a gas detection network for high-voltage electrical equipment 2.

[0084] Accordingly, a second aspect of the present invention provides a method for detecting the gas density of high-voltage electrical equipment, which detects the insulating gas in high-voltage electrical equipment 2 based on the aforementioned high-voltage electrical equipment gas density detection device 1, and includes the following steps:

[0085] In step S100, the real-time temperature value of the insulating gas in the gas passage of the high-voltage electrical equipment 2 or the gas outside the gas passage on the housing 18 is obtained based on the first temperature measuring component 16, and the real-time gas pressure value of the insulating gas in the gas passage of the high-voltage electrical equipment 2 is obtained based on the pressure detection component 15, and sent to the computing controller 11.

[0086] Since the first temperature sensor in the first temperature measuring component 16 is directly installed inside the housing 18 or the gas passage, and not in the thermal buffer unit, the collected temperature value can reflect gas data more quickly. Furthermore, when the device is first powered on, the data storage 14 does not store historical density data of the insulating gas in the high-voltage electrical equipment 2 used in actual engineering projects. Therefore, the temperature value and corresponding pressure value acquired by the first temperature measuring component 16 are uploaded to the monitoring server 4 as real-time data.

[0087] Step S200: Based on the auxiliary temperature measurement module, the temperature value inside the module after heat conduction through the auxiliary temperature measurement module of the surrounding environment of the high-voltage electrical equipment 2 at the housing 18 is obtained, and sent to the arithmetic controller 11.

[0088] Step S300: Based on the operation controller 11, the first gas density value corresponding to the real-time temperature value and the second gas density value corresponding to the temperature value within the module are obtained. The standard deviation values ​​of the first gas density value and the second gas density value within a preset period are calculated respectively, and the gas density value corresponding to the smaller standard deviation value is selected as the actual density value of the insulating gas in the high-voltage electrical equipment 2.

[0089] Theoretically, under the condition that the insulating gas in the sealed high-voltage electrical equipment 2 does not leak, the pressure and temperature of the insulating gas will fluctuate synchronously with the diurnal cycle of the external ambient temperature. In this case, the density value calculated according to the pressure-temperature mathematical model will not change. However, in actual engineering, the actual pressure of the insulating gas in the high-voltage electrical equipment 2 can be directly detected, while the actual temperature cannot. This is because the gas path of the pressure sensor in the insulating gas density monitoring device is connected to the gas path of the insulating gas in the high-voltage electrical equipment 2, thus allowing direct acquisition of pressure data. The temperature data of the insulating gas in the high-voltage electrical equipment 2 is indirectly obtained through a temperature sensor installed within the insulating gas density monitoring device. This temperature value is not the same as the actual temperature value that causes the pressure change of the insulating gas inside the high-voltage electrical equipment 2, resulting in the density value calculated by the program data model not accurately reflecting the density of the insulating gas inside the high-voltage electrical equipment 2.

[0090] To address the aforementioned issues and improve the accuracy of temperature detection of insulating gas inside high-voltage electrical equipment 2, an auxiliary temperature measurement module is used to obtain temperature values ​​corresponding to different thermal inertia indices and calculate the corresponding gas density values ​​and their standard deviations. The gas density value with the smallest standard deviation is selected as the actual density value of the insulating gas.

[0091] Further, after selecting the gas density value corresponding to the smaller standard deviation value in step S300 as the actual density value of the insulating gas inside the high-voltage electrical equipment 2, the following steps are included:

[0092] Step S411: Determine whether the actual density value of the insulating gas inside the high-voltage electrical equipment 2 is greater than the leakage alarm density threshold for comparison.

[0093] Step S412: If the actual density value is greater than the leakage alarm density threshold, then the insulation gas density value inside the high-voltage electrical equipment 2 is determined to meet the requirements.

[0094] Step S413: If the actual density value is less than or equal to the gas leakage alarm density threshold, it is determined that the insulating gas in the high-voltage electrical equipment 2 has leaked, and a gas leakage alarm signal is issued.

[0095] Gas density value (P) 20准确 ) and the set leakage alarm density threshold (P) 20漏气报警 Compare the values, and when the gas density value (P) is... 20准确 The gas leakage alarm density threshold (P) is equal to or less than the set threshold. 20漏气报警 When a gas leak occurs, a gas leak alarm signal is issued, or a gas leak alarm signal contact is established, or a gas leak notification message is issued, or a gas leak notification message is uploaded.

[0096] Furthermore, after selecting the gas density value corresponding to the smaller standard deviation value as the actual density value of the insulating gas inside the high-voltage electrical equipment 2, the following is also included:

[0097] Step S421: Determine whether the actual density value of the insulating gas inside the high-voltage electrical equipment 2 is greater than the gas replenishment density threshold for comparison.

[0098] In step S422, if the actual density value is greater than the gas replenishment density threshold, it is determined that the insulating gas density value inside the high-voltage electrical equipment 2 meets the requirements.

[0099] Step S423: If the actual density value is less than or equal to the gas replenishment density threshold, it is determined that the insulating gas in the high-voltage electrical equipment 2 has leaked, and a gas replenishment prompt signal is issued.

[0100] Gas density value (P) 20准确 ) and set the gas density threshold (P) that needs to be replenished. 20补气 The comparison was performed, and the accurate density value (P) was obtained. 20准确 The gas density threshold (P) is equal to or less than the gas density threshold that requires additional gas supply. 20补气 When the gas supply is insufficient, a gas replenishment alarm signal is issued, or a gas replenishment alarm signal contact is established, or a gas replenishment notice is issued, or a gas replenishment notice is uploaded.

[0101] This invention aims to protect a gas density detection device and method for high-voltage electrical equipment, used to detect the density of insulating gas in high-voltage electrical equipment. The device includes: a housing, a first temperature measuring component, a pressure measuring component, an auxiliary temperature measuring module, and a computing controller. The first temperature measuring component is disposed in a gas passage connected to the high-voltage electrical equipment or outside a gas passage on the housing. The pressure measuring component is disposed in a gas passage connected to the high-voltage electrical equipment, acquiring real-time temperature values ​​of the insulating gas in the gas passage or outside the gas passage on the housing, and real-time gas pressure values ​​in the high-voltage electrical equipment, respectively, and sending them to the computing controller. The auxiliary temperature measuring module is disposed in a gas passage connected to the high-voltage electrical equipment or outside a gas passage on the housing, acquiring the temperature value inside the module after heat conduction through the auxiliary temperature measuring module, and sending it to the computing controller. The computing controller calculates a first gas density value based on the real-time temperature value and the real-time gas pressure value, and calculates a second gas density value based on the temperature value inside the module and the real-time gas pressure value. It calculates the standard deviation of the first and second gas density values ​​within a preset period and selects the gas density value with the smaller standard deviation as the actual density value of the insulating gas inside the high-voltage electrical equipment. The above technical solution has the following effects:

[0102] By acquiring the real-time gas temperature value of the first temperature measuring component and the temperature values ​​of several modules in the auxiliary temperature measuring module, and combining them with the real-time gas pressure value, the corresponding density value and its standard deviation are calculated. The gas density value with the smallest standard deviation is selected as the actual density value of the gas in the high-voltage electrical equipment. This method has the advantages of high gas density detection accuracy and fast detection speed.

[0103] It should be understood that the specific embodiments described above are merely illustrative or explanatory of the principles of the invention and do not constitute a limitation thereof. Therefore, any modifications, equivalent substitutions, improvements, etc., made without departing from the spirit and scope of the invention should be included within the protection scope of the invention. Furthermore, the appended claims are intended to cover all variations and modifications falling within the scope and boundaries of the appended claims, or equivalent forms of such scope and boundaries.

Claims

1. A gas density detection device for high-voltage electrical equipment, characterized in that, The device is used to detect the density of insulating gas in high-voltage electrical equipment (2), including: housing (18), first temperature measuring component (16), pressure measuring component (15), auxiliary temperature measuring module and operation controller (11). The first temperature measuring component (16) is located in the gas passage connected to the high-voltage electrical equipment (2) or outside the gas passage on the housing (18). The pressure detection component (15) is located in the gas passage connected to the high-voltage electrical equipment (2). It acquires the real-time temperature value of the insulating gas in the gas passage or outside the gas passage on the housing (18) and the real-time gas pressure value in the high-voltage electrical equipment (2), and sends them to the computing controller (11). The auxiliary temperature measuring module is set in the air passage connected to the high-voltage electrical equipment (2) or outside the air passage on the housing (18), to obtain the temperature value inside the module after heat conduction through the auxiliary temperature measuring module, and send it to the arithmetic controller (11). The auxiliary temperature measurement module includes: a plurality of second temperature measurement components (17), each of the plurality of second temperature measurement components (17) includes: a second thermal buffer unit and a second temperature sensor (174) disposed therein, and the thermal inertia index of the second thermal buffer units in the plurality of second temperature measurement components 17 is different; The operation controller (11) calculates a first gas density value based on the real-time temperature value and the real-time gas pressure value, and calculates a second gas density value based on the temperature value and the real-time gas pressure value within the module. It calculates the standard deviation of the first gas density value and the second gas density value within a preset period and selects the gas density value corresponding to the smaller standard deviation value as the actual density value of the insulating gas in the high-voltage electrical equipment (2).

2. The gas density detection device for high-voltage electrical equipment according to claim 1, characterized in that, The plurality of second temperature measuring components (17) are respectively used to obtain the temperature value inside the module of the environment in which the high-voltage electrical equipment (2) is located; The operation controller (11) receives the temperature values ​​within the modules obtained by the plurality of second temperature measuring components (17), and calculates the plurality of second gas density values ​​and their standard deviation values ​​corresponding to the plurality of second temperature measuring components (17) in combination with the real-time gas pressure value. The smaller of the standard deviation value of the plurality of second gas density values ​​and the standard deviation value of the first gas density value is obtained as the actual density value of the insulating gas in the high-voltage electrical equipment (2).

3. The gas density detection device for high-voltage electrical equipment according to claim 2, characterized in that, The second temperature sensor (174) acquires the temperature value inside the module after the ambient temperature of the high-voltage electrical equipment (2) has been conducted by the second thermal buffer unit. The operation controller (11) is electrically connected to the second temperature sensor (174) and receives the temperature value inside the module detected by the second temperature sensor (174).

4. The gas density detection device for high-voltage electrical equipment according to claim 3, characterized in that, The second heat buffer unit is made of the same material but has a different thickness; or, The second heat buffer unit is made of a different material but has the same thickness; or, The second thermal buffer unit is made of a different material and has a different thickness.

5. The gas density detection device for high-voltage electrical equipment according to claim 4, characterized in that, The second thermal buffer unit includes: a second heat storage component (171) and a second thermal resistance component (172); in, The second heat storage component (171) and the second thermal resistance component (172) in any two of the second temperature measuring components (17) are made of the same material but have different thicknesses; or, The materials of the second heat storage component (171) and the second thermal resistance component (172) in any two of the second temperature measuring components (17) are different, but their thicknesses are the same; or, The materials and thicknesses of the second heat storage component (171) and the second thermal resistance component (172) in any two of the second temperature measuring components (17) are different.

6. The gas density detection device for high-voltage electrical equipment according to claim 2, characterized in that, Each temperature sensor (174) in the plurality of second temperature measuring components (17) is a digital temperature sensor, an analog temperature sensor, or a sensor assembly with different temperature response speeds.

7. The gas density detection device for high-voltage electrical equipment according to any one of claims 1-6, characterized in that, The pressure detection component (15) includes: a digital signal pressure sensor or an analog signal pressure sensor; The operational controller (11) receives the digital signal pressure value from the digital signal pressure sensor or the analog signal pressure value from the analog signal pressure sensor, and then converts it into a corresponding digital pressure signal via an AD converter.

8. The gas density detection device for high-voltage electrical equipment according to claim 7, characterized in that, Also includes: A gas path assembly, the gas path assembly including: a gas path connector (192) and / or a gas path line (191). The gas pipeline (191) is connected to the gas interface (21) of the high-voltage electrical equipment (2) through the gas connector (192); The pressure detection component (15) is disposed in the gas pipeline (191), and the first temperature measuring component (16) is disposed in the gas pipeline (191) or outside the gas pipeline (191) on the housing (18).

9. A method for detecting gas density in high-voltage electrical equipment, characterized in that, The high-voltage electrical equipment gas density detection device according to any one of claims 1-8 detects the insulating gas in the high-voltage electrical equipment (2), including the following steps: The real-time temperature value of the insulating gas in the gas passage of the high-voltage electrical equipment (2) or the gas outside the gas passage on the shell (18) is obtained based on the first temperature measuring component (16), and the real-time gas pressure value of the insulating gas in the gas passage of the high-voltage electrical equipment (2) is obtained based on the pressure detection component (15) and sent to the operation controller (11). The temperature value inside the module after the high-voltage electrical equipment (2) around the housing (18) is obtained by the auxiliary temperature measurement module and then sent to the operation controller (11). Based on the operation controller (11), the first gas density value corresponding to the real-time temperature value and the second gas density value corresponding to the temperature value in the module are obtained. The standard deviation values ​​of the first gas density value and the second gas density value within a preset period are calculated respectively, and the gas density value corresponding to the smaller standard deviation value is selected as the actual density value of the insulating gas in the high-voltage electrical equipment (2).

10. The gas density detection method for high-voltage electrical equipment according to claim 9, characterized in that, After selecting the gas density value corresponding to the smaller standard deviation value as the actual density value of the insulating gas inside the high-voltage electrical equipment (2), the process includes: The actual density value of the insulating gas inside the high-voltage electrical equipment (2) is compared to whether it is greater than the leakage alarm density threshold. If the actual density value is greater than the gas leakage alarm density threshold, then the insulation gas density value inside the high-voltage electrical equipment (2) is determined to meet the requirements; If the actual density value is less than or equal to the gas leakage alarm density threshold, it is determined that the insulating gas in the high-voltage electrical equipment (2) has leaked, and a gas leakage alarm signal is issued.

11. The method for detecting gas density in high-voltage electrical equipment according to claim 10, characterized in that, After selecting the gas density value corresponding to the smaller standard deviation value as the actual density value of the insulating gas inside the high-voltage electrical equipment (2), the method further includes: The actual density value of the insulating gas inside the high-voltage electrical equipment (2) is compared to whether it is greater than the gas replenishment density threshold. If the actual density value is greater than the gas replenishment density threshold, then the insulation gas density value inside the high-voltage electrical equipment (2) is determined to meet the requirements; If the actual density value is less than or equal to the gas replenishment density threshold, it is determined that the insulating gas in the high-voltage electrical equipment (2) has leaked, and a gas replenishment prompt signal is issued.

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