CN116481598B - Insulating gas non-electric parameter on-line monitoring device - Google Patents
Insulating gas non-electric parameter on-line monitoring device Download PDFInfo
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Abstract
The invention provides an insulating gas non-electric parameter on-line monitoring device, which comprises: a connection interface; the density relay body is provided with a mechanical dial plate; the pointer displacement sensor is used for acquiring density data of the insulating gas; the gas circulation bin is used for guiding the insulating gas into the gas circulation bin; the data acquisition module is used for carrying out on-line monitoring on the insulating gas in the gas circulation bin to acquire temperature and pressure data of the insulating gas, component and component content data of decomposition products of the insulating gas and micro-water data of the insulating gas. The invention obtains the density data of the insulating gas through the pointer displacement sensor; the insulating gas in the gas circulation bin is monitored on line through the data acquisition module, so that temperature and pressure data of the insulating gas, micro water data of the insulating gas and component content data of decomposition products of the insulating gas are obtained, and the integration of multi-parameter and on-line monitoring of the insulating gas and the density relay is realized.
Description
Technical Field
The invention relates to the technical field of operation and maintenance of power transmission and transformation equipment, in particular to an insulating gas non-electric parameter on-line monitoring device.
Background
At present, gas-insulated power equipment such as GIS switches, column insulators, bushings and composite cross arm insulators for lines for transformer substations or convertor stations improves internal insulation strength by filling insulating gases such as SF6, N2, mixed gas and environment-friendly gas inside, and ensures operation insulation safety.
The long-term outdoor operation of the gas-insulated electrical equipment is greatly influenced by environments such as large temperature difference, strong wind and the like, the low-frequency vibration under the long-term electrified operation has larger influence on the crimping part, the possibility of the decrease of the insulating strength of gas leakage possibly exists, the density of the insulating gas needs to be monitored in real time, the leakage is early-warned, and the leakage point is timely searched and maintained.
The power equipment is different according to voltage class and different inside insulating gas density that fills of function, and the insulating gas liquefaction temperature of different densities is different, in case the temperature drops to insulating gas's liquefaction temperature, will appear insulating properties decline by a wide margin, need monitor insulating gas temperature, carries out the heat preservation and mends gas, avoids the insulating problem that the temperature is too low to bring.
The environment can also have a larger influence on the micro water content of the insulating gas, when the equipment is electrified to run or the ambient temperature is increased, the average kinetic energy of water molecules in the equipment can be increased, so that the water molecules originally attached to the wall and the surface of the insulating part are released again, the number of the water molecules in the insulating gas is increased, and the micro water value is correspondingly increased. Although SF6 gas pressure in the circuit breaker is higher than external air pressure, the water content in the circuit breaker is lower, and the external water content is higher than the inside of the circuit breaker by more than one hundred times, so that the water molecule permeability is extremely strong, once the air chamber has micro leakage, under the action of huge pressure difference between the inside and the outside, the water in the atmosphere can gradually permeate into the insulating gas through the sealing element, so that micro water is raised, and the insulating property is directly influenced.
SF6 decomposition gas can be generated if discharge occurs in the gas insulation electric equipment, the decomposition gas comprises SO2, H2S and fluoride, different decomposition products can represent different fault characteristics, the concentration of the decomposition products has great influence on the insulation performance of the insulation gas, and the monitoring of the SF6 decomposition products has important significance for fault judgment and operation state evaluation of the electric equipment.
In summary, in order to avoid faults such as gas leakage, gas liquefaction, excess of micro water, discharge and the like of the gas-insulated electrical equipment as much as possible, it is necessary to monitor non-electrical parameters such as the density, temperature, micro water, decomposition products and the like of the insulating gas in real time.
In the prior art, the density relay is used for monitoring the density of insulating gas, the density relay is a mechanical instrument and is provided with a dial plate, the temperature correction of SF6 is carried out by an expansion pipe for sealing SF6, the pressure of SF6 can be corrected to 20 ℃, P20 is used for representing the density of the insulating gas, pressure data can be read through the dial plate, and meanwhile, the density relay is provided with a relay signal and is used for carrying out signal transmission such as early warning and locking after gas leakage. And for equipment such as GIS buses and inflation sleeves, an early warning signal is connected, early warning is carried out when the pressure is reduced to below the early warning pressure, and for equipment such as gas switches and circuit breakers, early warning, single locking or double locking signals are connected, and locking operation is carried out when the pressure is reduced to the locking pressure.
At present, most outdoor gas insulation equipment adopts a density relay to monitor the gas state, and operation and maintenance personnel perform meter data recording work in each operation and maintenance period. And the SF6 leakage monitoring device is also adopted by the indoor gas insulation equipment with the voltage class of 110kV or below to carry out SF6 leakage monitoring of the equipment, SF6 gas leaked in the equipment room is detected through the SF6 transmitter probe, and the occurrence of gas leakage is early-warned through the audible and visual alarm at the doorway of the equipment room to prevent personnel from entering the equipment room with the SF6 leakage to generate suffocation.
The mechanical instrument of the density relay is adopted, the monitoring parameters are single, the data are required to be recorded manually, and the workload is high.
Disclosure of Invention
In view of the above, the invention provides an insulating gas non-electric parameter on-line monitoring device, which aims to solve the problems that the monitoring quantity of the existing density relay is single and the workload is large because the data are required to be recorded manually.
The invention provides an insulating gas non-electric parameter on-line monitoring device, which comprises: the connecting interface is internally provided with a gas passage and is used for connecting a gas chamber gas port of the gas-insulated power equipment so as to enable insulating gas in the gas-insulated power equipment to flow into the gas passage; the density relay body is internally provided with a density detection passage, and the density detection passage is communicated with the gas passage and is used for detecting and displaying the density of the insulating gas in the density detection passage; the density relay body is provided with a mechanical dial plate, and the mechanical dial plate is provided with scales and pointers for displaying the density of the insulating gas; the pointer displacement sensor is arranged on the mechanical dial and is used for adopting the displacement principle of measuring the pointer and zero value, corresponding the pointer displacement to the dial scale, realizing the electronization of the measured value of the mechanical meter and obtaining the density data of the insulating gas; the gas circulation bin is communicated with the gas passage and is used for guiding the insulating gas into the gas circulation bin, guiding the insulating gas into the gas passage after flowing along the gas circulation bin and flowing out into the gas insulation power equipment to realize the circulation flow of the insulating gas; the data acquisition module is used for carrying out on-line monitoring on the insulating gas in the gas circulation bin to acquire temperature and pressure data of the insulating gas, component and component content data of decomposition products of the insulating gas and micro-water data of the insulating gas.
Further, the insulating gas non-electric parameter on-line monitoring device comprises a data acquisition module, wherein the data acquisition module comprises: the temperature and pressure sensor is arranged at the upstream of the gas circulation bin and is used for detecting the temperature and pressure of the insulating gas in the gas circulation bin, acquiring temperature data and pressure data of the insulating gas and determining the pressure data of the insulating gas corrected to 20 ℃ based on the temperature data and the pressure data of the insulating gas; the decomposition product sensor is arranged at the downstream of the gas circulation bin and is used for monitoring the decomposition products of the insulating gas and acquiring the components and the component content data of the decomposition products of the insulating gas; and the micro-water sensor is arranged between the temperature and pressure sensor and the decomposition product sensor and is used for carrying out micro-water monitoring on the insulating gas to obtain micro-water data of the insulating gas.
Further, the insulating gas non-electric parameter on-line monitoring device further comprises: the self-checking module is respectively connected with the pointer displacement sensor and the temperature and pressure sensor and is used for receiving the density data of the insulating gas and the pressure data of the insulating gas at 20 ℃ and carrying out self-checking on the density data based on the density data of the insulating gas and the pressure data of the insulating gas at 20 ℃.
Further, the insulating gas non-electric parameter on-line monitoring device performs density data self-checking based on the density data of the insulating gas and the insulating gas pressure data at 20 ℃, and comprises: determining a difference Deltaρ between the insulating gas and the insulating gas at 20 ℃ based on the density data of the insulating gas and the pressure data of the insulating gas, and determining a density processing type based on the difference; and determining a density control strategy based on the density processing type, and performing self-checking adjustment based on the density control strategy.
Further, the insulating gas non-electric parameter on-line monitoring device, based on the difference value, determines the density processing type, including: setting a first preset difference Deltaρ1 and a second preset difference Deltaρ2, and 0 < Deltaρ1 < Deltaρ2; when Deltaρ1 is less than or equal to Deltaρ < Deltaρ2, determining the early warning type as data deviation early warning; when the Deltaρ is not less than Deltaρ2, determining the early warning type as data error early warning.
Further, the insulating gas non-electric parameter on-line monitoring device determines a density control strategy based on a density processing type, and comprises: when the early warning type is data deviation early warning, the control strategy is based on insulating gas pressure data at 20 ℃ to correct the pointer displacement sensor; when the early warning type is data error early warning, the control strategy is to replace the density relay body.
Further, the insulating gas non-electric parameter on-line monitoring device further comprises: the data integration module is connected with the data acquisition module and is used for receiving density data, temperature data, insulating gas pressure data at 20 ℃, component and component content data of decomposition products and micro water data; the early warning type determining module is connected with the acquisition module and used for determining the early warning type based on density data, temperature data, insulating gas pressure data at 20 ℃, components and component content data of decomposition products and micro water data; and the control module is used for determining a control strategy associated with the early warning type so as to control the gas-insulated power equipment based on the control strategy.
Further, the insulating gas non-electric parameter on-line monitoring device determines an early warning type based on density data, temperature data, insulating gas pressure data at 20 ℃, component and component content data of decomposed products, and micro water data, and comprises: when the solid insulation is corroded based on a preset corrosion rule, determining that the early warning type is fixed insulation corrosion early warning; when the overheat fault is determined to occur based on a preset overheat rule, determining that the early warning type is overheat fault early warning; when the occurrence of the discharge fault is determined based on a preset discharge rule, determining the early warning type as discharge fault early warning; wherein, preset erosion rules are: determining that the fixed insulation is eroded when it is determined that the component content of CS2 continuously increases within the first preset time period based on the component and component content data of the decomposition product, and the component content of CS2 is greater than the first preset content; the preset overheat rule is as follows: determining that an overheat fault occurs when the component content of SO2 is determined to be greater than the second preset content, the component content of H2S is determined to be greater than the third preset content and the temperature is determined to be greater than the preset temperature value based on the component and component content data and the temperature data of the decomposed product; the preset discharge rule is as follows: determining that a discharge fault occurs when the component content of SO2 is greater than a fourth preset content, the component content of H2S is greater than a fifth preset content, and the component content of C3F8 is greater than a sixth preset content, and CO2 based on the component and component content data of the decomposition product; the second preset content is smaller than the fourth preset content, and the third preset content is smaller than the fifth preset content.
Further, the insulating gas non-electric parameter on-line monitoring device determines a control strategy associated with the early warning type, and the device comprises: when the early warning type is fixed insulation corrosion early warning, the control strategy is power failure and overhauls the internal insulation condition of the equipment; when the early warning type is overheat fault early warning, the control strategy is power failure, overheat fault points are searched, overheat fault points are processed, and overheat faults are eliminated; when the early warning type is discharge fault early warning, the control strategy is to find a discharge point, process the discharge point and eliminate the discharge fault.
Further, in the insulating gas non-electric parameter on-line monitoring device, a drainage fan is arranged in the gas circulation bin and used for conducting drainage on the insulating gas so that the insulating gas flows from upstream to downstream in the gas circulation bin after being discharged from the gas passage and flows back to the gas passage in a circulating way; the gas circulation bin is also provided with a deflation port for exhausting air.
According to the insulating gas non-electric parameter on-line monitoring device, the device is connected with gas insulating power equipment through the connecting interface, and gas can be led out, so that on-line monitoring of insulating gas is realized; the density of the insulating gas is displayed through the density relay body, and density data of the insulating gas is obtained through the pointer displacement sensor; the insulating gas is guided into the gas circulation bin through the gas circulation bin, flows along the gas circulation bin and then is guided into the gas passage to flow out into the gas insulation power equipment, so that the circulating flow of the insulating gas is realized; the insulating gas in the gas circulation bin is monitored on line through the data acquisition module, so that temperature and pressure data of the insulating gas, micro-water data of the insulating gas and component content data of decomposition products of the insulating gas are obtained, the integration of multi-parameter and on-line monitoring of the insulating gas is realized, multi-parameter monitoring of the insulating gas comprising density, temperature, pressure, micro-water and decomposition products can be realized, and the problems that the monitoring quantity of the existing density relay is single and the workload is large due to the fact that the data are required to be recorded manually are solved. The device also has the following advantages:
(1) Under the condition of not changing the original gas path interface and electrical connection, the insulation multi-parameter on-line monitoring and the gas density relay are integrated, so that the device has the relay function and the multi-parameter on-line monitoring function.
(2) The insulating gas non-electric monitoring parameters comprise density, temperature, pressure, micro water and decomposition products, the monitoring quantity is complete and various, and the multi-dimension reflects the running state of the insulating gas.
(3) And the pointer displacement sensor is used for sensing the change of the density data, the mechanical part and the electronic part are completely consistent in reading the data, and the complete correspondence between the mechanical signal and the electronic signal is realized. Meanwhile, a temperature and pressure sensor is arranged to sense the temperature and pressure of the insulating gas, a SF6 temperature and pressure formula is utilized to obtain P20, the two groups of data can be subjected to contrast self-checking, and meanwhile, the temperature monitoring can provide basic data for liquefaction early warning; wherein P20 is an insulating gas pressure value corrected to 20 ℃.
(4) The design of the gas path unit is reasonable and ingenious, the distribution design of the sensors can realize accurate and reliable sensing of various parameters, the pointer displacement sensor is positioned near the pointer of the dial plate, the change condition of the pointer displacement can be comprehensively reflected, the temperature and pressure sensor is positioned near the gas inlet, the temperature and pressure condition of the atmosphere chamber can be most directly reflected, the micro water and decomposition product sensor is positioned in the gas circulation bin, the effective monitoring of micro water and decomposition products of circulating gas can be realized, the design of the air release port can realize the removal of air in the gas path, and the monitoring analysis of the gas in the gas chamber can be more accurately carried out.
(5) The device adopts the wireless communication module to carry out the communication with the host computer, and the remote transmission part power supply can adopt power conversion module or high-power battery to carry out, does not change original wiring mode, like the replacement of the density relay meter in the existing station, does not have loaded down with trivial details wiring, convenient and fast.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to designate like parts throughout the figures. In the drawings:
FIG. 1 is a schematic diagram of an insulation gas non-electric parameter on-line monitoring device according to an embodiment of the invention;
FIG. 2 is a block diagram of an insulating gas non-electrical parameter on-line monitoring device according to an embodiment of the present invention;
fig. 3 is a block diagram of a data acquisition module according to an embodiment of the present invention.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. It should be noted that, without conflict, the embodiments of the present invention and features of the embodiments may be combined with each other. The invention will be described in detail below with reference to the drawings in connection with embodiments.
Referring to fig. 1 and 2, a preferred structure of an insulating gas non-electric parameter on-line monitoring device provided by an embodiment of the invention is shown. As shown, the apparatus includes: the device comprises a connecting interface 1, a density relay body 2, a pointer displacement sensor 3, a gas circulation bin 4, a data acquisition module 5, a junction box 6, a self-checking module 7, a data integration module 8, an early warning type determining module 9 and a control module 10; wherein, the inside of the connection interface 1 is provided with a gas passage 11, and the connection interface 1 is used for connecting a gas chamber gas port of a gas-insulated power device (not shown in the figure) so that the insulating gas in the gas-insulated power device flows into the gas passage 11. Specifically, the connection interface 1 can be connected with an air chamber air port of gas-insulated power equipment such as a power station site GIS, an air charging sleeve and the like; the connecting interface 1 can be an external thread structure, and the external thread size of the external thread structure can be M20 x 1.5 or G1/2 according to field general connection; wherein M20 is 1.5mm, the diameter of the thread is 20mm, G1/2 is 14 teeth per inch, and the pitch is 1.814mm. The inside of the connection interface 1 is provided with a gas passage 11, and the gas passage 11 is communicated with a gas circuit of the gas-insulated power equipment so that insulating gas in the gas-insulated power equipment flows into the gas passage 11 for on-line monitoring. The device may also be provided with a housing on which the connection interface 1 is arranged. Wherein the insulating gas is SF6. Of course, the device can be used for on-line monitoring of SF6 insulating gas, N2, mixed gas, C4 and other environment-friendly gases, namely, the device is not only suitable for SF6 insulating gas, but also can be used for on-line monitoring of other gases.
A density detection passage 21 is arranged in the density relay body 2, and the density detection passage 21 is communicated with the gas passage 11 and is used for detecting and displaying the density of the insulating gas in the density detection passage 21; the density relay body 2 is provided with a mechanical dial 22, and the mechanical dial 22 is provided with a scale and a pointer 23 for displaying the density of the insulating gas. Specifically, the density relay body 2 may be an SF6 density relay provided with a density detection passage 21, a mechanical dial 22, and a relay unit 24, the density detection passage 21 communicating with the gas passage 11 to perform density detection of the insulating gas and perform density display through the mechanical dial 22. The mechanical dial 22 is arranged on the shell, and the relay unit 24 is used for performing early warning and locking and switching on and off signals based on the density of insulating gas.
The pointer displacement sensor 3 is arranged on the mechanical dial 22 and is used for adopting the displacement amount principle of measuring the pointer 23 and the zero value to correspond the displacement of the pointer 23 with the dial scale, realizing the electronization of the mechanical gauge value and acquiring the density data of the insulating gas. Specifically, the pointer displacement sensor 3 is mounted on the mechanical dial 22, and adopts the principle of measuring the displacement of the pointer and zero value to correspond the pointer displacement to the dial scale, thereby realizing the electronization of the measured value of the mechanical meter and obtaining the density data of the insulating gas. The pointer displacement sensor 3 may be a magnetic steel angle sensor.
The gas circulation bin 4 is communicated with the gas passage 11 and is used for guiding the insulating gas into the gas circulation bin 4, and guiding the insulating gas into the gas passage 11 to flow into the gas insulation power equipment after flowing along the gas circulation bin 4, so that the circulation flow of the insulating gas is realized. Specifically, the gas circulation bin 4 is provided with a gas inlet and a gas outlet, and the gas inlet and the gas outlet are both communicated with the gas passage 11; the insulating gas in the gas-insulated power equipment flows from the gas passage 11, flows through the gas inlet, flows into the gas circulation bin 4, flows from upstream to downstream along the gas circulation bin 4, flows back into the gas passage 11 from the gas discharge port, and flows back into the gas-insulated power equipment along the gas passage 11 to form a gas circulation channel; the air inlet and the air outlet may be in communication. Wherein the direction of the dotted arrow in fig. 1 refers to the flow direction of the insulating gas. Wherein, the gas circulation bin 4, the gas passage 11 and the density detection passage 21 are combined to form an integral gas passage unit to realize the circulation of gas. In this embodiment, as shown in fig. 1, a drainage fan 41 is disposed in the gas circulation chamber 4, and is used for guiding the insulating gas, so that the insulating gas flows from upstream to downstream along the gas circulation chamber 4 after being discharged from the gas passage 11, and flows back into the gas passage 11 in a circulating manner, so that the insulating gas flows from upstream to downstream in the gas circulation chamber 4. Wherein, the drainage fans 41 can be two, namely an air inlet fan and an air outlet fan, the air inlet fan is arranged at the upstream, and the air outlet fan is arranged at the air discharge port; the gas circulation bin 4 is also provided with a deflation port 42 for exhausting air and exhausting air in the gas path unit, so that the insulating gas is better monitored in a non-electric parameter mode. Wherein, the non-electric parameters can include density, temperature and pressure, micro water and decomposer components.
The data acquisition module 5 is used for carrying out on-line monitoring on the insulating gas in the gas circulation bin 4 to acquire temperature and pressure data of the insulating gas, micro water data of the insulating gas and component content data of decomposition products of the insulating gas. Specifically, along the flowing direction of the insulating gas in the gas circulation bin, the data acquisition module 5 sequentially performs temperature and pressure acquisition, micro-water acquisition and decomposition product component acquisition on the insulating gas so as to sequentially obtain temperature and pressure data of the insulating gas, micro-water data of the insulating gas and component content data of the decomposition product of the insulating gas.
The junction box 6 is provided on the housing, and is connected to the density relay body 2, and can be connected to the relay unit 24. Specifically, the terminal block 6 is provided with a terminal 61, and the terminal 61 is a seven-core terminal which can be effectively matched with a density relay used in a current station.
The self-checking module 7 is connected with the pointer displacement sensor 3 and the data acquisition module 5, and is used for receiving the density data of the insulating gas acquired by the pointer displacement sensor 3 and the temperature and pressure data of the insulating gas acquired by the data acquisition module 5, and performing self-checking of the density data based on the density data of the insulating gas and the temperature and pressure data of the insulating gas. Specifically, the self-checking module 7 may determine the insulating gas pressure data corrected to 20 ℃ based on the insulating gas temperature pressure data, and the density data of the insulating gas displayed by the mechanical dial 22 is also the insulating gas pressure data at 20 ℃, so that the density data of the insulating gas acquired by the pointer displacement sensor 3 is also the insulating gas pressure data at 20 ℃, and the self-checking correction is performed on the pointer displacement sensor 3 based on the insulating gas temperature pressure data corrected to 20 ℃ and the insulating gas pressure data acquired by the pointer displacement sensor 3, that is, the insulating gas pressure data at 20 ℃.
The data integration module 8 is connected with the data acquisition module 5 and is used for receiving density data, temperature data, insulating gas pressure data at 20 ℃, component and component content data of decomposition products and micro water data.
The early warning type determining module 9 is connected with the data integrating module 8 and is used for determining the early warning type based on density data, temperature data, insulating gas pressure data at 20 ℃, components and component content data of the decomposed product and micro water data. Specifically, the method for determining the early warning type based on density data, temperature data, insulating gas pressure data at 20 ℃, component and component content data of decomposed substances and micro water data comprises the following steps:
when the solid insulation is corroded based on a preset corrosion rule, determining that the early warning type is fixed insulation corrosion early warning;
when the overheat fault is determined to occur based on a preset overheat rule, determining that the early warning type is overheat fault early warning;
when the occurrence of the discharge fault is determined based on a preset discharge rule, determining the early warning type as discharge fault early warning;
wherein, preset erosion rules are: determining that the fixed insulation is eroded when it is determined that the component content of CS2 continuously increases within the first preset time period based on the component and component content data of the decomposition product, and the component content of CS2 is greater than the first preset content;
The preset overheat rule is as follows: determining that an overheat fault occurs when the component content of SO2 is determined to be greater than the second preset content, the component content of H2S is determined to be greater than the third preset content and the temperature is determined to be greater than the preset temperature value based on the component and component content data and the temperature data of the decomposed product;
the preset discharge rule is as follows: determining that a discharge fault occurs when the component content of SO2 is greater than a fourth preset content, the component content of H2S is greater than a fifth preset content, and the component content of C3F8 is greater than a sixth preset content, and CO2 based on the component and component content data of the decomposition product;
the second preset content is smaller than the fourth preset content, and the third preset content is smaller than the fifth preset content.
Of course, determining the early warning type based on the density data, the temperature data, the insulating gas pressure data at 20 ℃, the component and component content data of the decomposed product, and the micro water data may further include:
if the slow leakage is determined to exist based on the first preset leakage rule, determining that the early warning type is slow leakage early warning;
if the existence of the density low-value leakage is determined based on the second preset leakage rule judgment, determining that the early warning type is the density low-value early warning;
if the temperature data is based on the fact that the temperature continuously rises within the preset time period, the early warning type is determined to be the temperature continuously rising early warning;
If the temperature is determined to continuously rise based on the temperature data and the gas leakage is determined to be absent based on the micro water content, when the micro water content rises to a preset micro water content threshold value of a first preset percentage, determining that the early warning type is micro water out-of-standard early warning;
if the temperature is determined to continuously rise based on the temperature data and the gas leakage is determined to be absent based on the micro water content, when the micro water content rises to a preset micro water content threshold value, determining that the early warning type is micro water out-of-standard warning;
if the temperature is determined to continuously rise based on the temperature data and gas leakage is determined to exist based on the micro water content, the early warning type is determined to be leakage and micro water exceeding comprehensive early warning;
if the temperature is determined to continuously drop based on the temperature data, determining that the early warning type is temperature continuously drop early warning;
if the temperature is determined to continuously decrease based on the temperature data, and no leakage is determined to exist based on the first preset leakage rule or the second preset leakage rule, determining that the early warning type is liquefaction early warning when the temperature decreases to a liquefaction temperature threshold value of a first preset percentage;
if the temperature is determined to continuously decrease based on the temperature data, and no leakage is determined to exist based on the first preset leakage rule or the second preset leakage rule, determining that the early warning type is liquefaction warning when the temperature decreases to the liquefaction temperature threshold value;
If the temperature is determined to continuously drop based on the temperature data and the gas leakage is determined to exist based on the first preset leakage rule or the second preset leakage rule, if the temperature does not reach the liquefaction temperature, determining that the early warning type is leakage early warning;
if the temperature is determined to continuously drop based on the temperature data and the gas leakage is determined to exist based on the first preset leakage rule or the second preset leakage rule, if the temperature reaches the liquefaction temperature, determining that the early warning type is comprehensive early warning of liquefaction and leakage;
the first preset leakage rule includes: if the density is determined to continuously decrease in the first preset time period based on the gas density data, and the decrease value is larger than a preset density decrease threshold value of the first preset percentage and smaller than the preset density decrease threshold value, determining that the early warning type is slow leakage early warning; if the density is determined to continuously decrease in the first preset time period based on the gas density data, and the decrease value is larger than a preset density decrease threshold value, determining that the early warning type is slow leakage warning;
a second preset leakage rule comprising: if the current density is lower than the preset early warning density threshold value of the first preset percentage based on the gas density data, determining that the warning type is a density low-value early warning; if the current density is determined to be lower than the preset early warning density threshold value based on the gas density, determining that the alarm type is a density low value alarm.
In the embodiment, when determining whether gas leakage exists based on the micro water content, comparing the acquired micro water content data with a relation curve of the micro water content along with temperature change under the condition of no leakage so as to determine whether the gas leakage exists; and determining a density interval in which the acquired insulating gas density data is located, determining a temperature interval corresponding to the density interval based on a corresponding relation between the density and the liquefaction temperature, and determining a liquefaction temperature threshold based on the maximum value in the temperature interval.
The control module 10 is connected to the early warning type determination module 9 for determining a control strategy associated with the early warning type for controlling the gas insulated electrical power plant based on the control strategy. Specifically, determining a control strategy associated with the early warning type includes:
when the early warning type is fixed insulation corrosion early warning, the control strategy is power failure and overhauls the internal insulation condition of the equipment;
when the early warning type is overheat fault early warning, the control strategy is power failure, overheat fault points are searched, overheat fault points are processed, and overheat faults are eliminated;
when the early warning type is discharge fault early warning, the control strategy is to find a discharge point, process the discharge point and eliminate the discharge fault.
Determining a control strategy associated with the early warning type may further comprise:
when the early warning type is slow leakage warning or density low value warning, the control strategy is to search for a leakage point, and air supplementing operation is carried out on the equipment;
when the early warning type is the continuous temperature rising early warning and the micro water exceeding early warning, the control strategy is to cool the equipment;
when the early warning type is leakage and micro water exceeding comprehensive early warning, the control strategy is to perform cooling treatment on the equipment and search for a leakage point at the same time, and perform air supplementing operation on the equipment;
when the early warning type is temperature continuous decrease early warning and liquefaction warning, the control strategy is to heat the equipment;
when the early warning type is leakage early warning, the control strategy is to search for a leakage point, and air supplementing operation is carried out on the equipment;
when the early warning type is liquefaction and leakage comprehensive early warning, the control strategy is to heat up the equipment and search for the leakage point at the same time, and perform air supplementing operation on the equipment.
With continued reference to fig. 1 and 3, in this embodiment, the data acquisition module 5 includes: a temperature and pressure sensor 51, a micro water sensor 52, and a decomposition product sensor 53; the temperature and pressure sensor 51 is disposed upstream of the gas circulation bin 4, and is configured to detect a temperature and pressure of the insulating gas in the gas circulation bin, obtain temperature data and pressure data of the insulating gas, and determine the insulating gas pressure data corrected to 20 ℃ based on the temperature data and the pressure data of the insulating gas; the decomposition product sensor 53 is disposed downstream of the gas circulation bin 4, and is configured to monitor decomposition products of the insulating gas, and acquire component and component content data of the decomposition products of the insulating gas; the micro-water sensor 52 is disposed between the temperature and pressure sensor 51 and the decomposition product sensor 53, and is used for performing micro-water monitoring on the insulating gas to obtain micro-water data of the insulating gas. Specifically, the temperature and pressure sensor 51 measures the pressure and temperature of the insulating gas, i.e., SF6, using the piezoresistive and thermal resistance principles. The micro water sensor 52 may be a humidity sensor, and the micro water is monitored by absorbing water molecules with a contact type film. In this embodiment, the decomposed product sensor 53 may include several groups of sensor bodies, as shown in fig. 1, two groups of sensor bodies may be used, each sensor body includes a light source emitter 531, a filter 532, and a light source receiver 533, the sensor bodies adopt a spectrum principle, the filter 532 may be changed to obtain light beams of wavelength bands corresponding to different insulating gas decomposers (such as H2S, SO2, etc.), the filter 532 may be two groups of a and a 'or B and B', different groups of filter may be configured according to the monitored gas components, and the concentration of the decomposed product may be monitored by measuring the light beam absorption capability of the insulating gas decomposer on a specific wavelength band. In this embodiment, after the insulating gas enters the gas circulation bin 4 from the gas inlet, the insulating gas passes through the temperature and pressure sensor 51, passes through the micro water sensor 52, passes through the decomposition product sensor 53, and circulates to the gas discharge port, and flows into the gas passage 11, so that the monitoring of the micro water and decomposition products of the insulating gas can be better performed through the gas circulation.
In this embodiment, the self-checking module 7 is connected to the pointer displacement sensor 3 and the temperature and pressure sensor 51, respectively, and is configured to receive the density data of the insulating gas and the pressure data of the insulating gas at 20 ℃, and perform self-checking of the density data based on the density data of the insulating gas and the pressure data of the insulating gas at 20 ℃. The density data sensing can be synchronously carried out through the pointer displacement sensor and the temperature and pressure sensor, the monitoring means are complete, and the self-checking can be realized.
Preferably, the density data self-check is performed based on the density data of the insulating gas and the pressure data of the insulating gas at 20 ℃, including:
based on the density data of the insulating gas and the pressure data of the insulating gas at 20 ℃, a difference Δρ between the two is determined, and based on the difference, a density process type is determined. Specifically, determining the density processing type based on the difference value includes: setting a first preset difference Deltaρ1 and a second preset difference Deltaρ2, and 0 < Deltaρ1 < Deltaρ2; when Deltaρ1 is less than or equal to Deltaρ < Deltaρ2, determining the early warning type as data deviation early warning; when the Deltaρ is not less than Deltaρ2, determining the early warning type as data error early warning. When Δρ| < Δρ1, no processing is required.
And determining a density control strategy based on the density processing type, and performing self-checking adjustment based on the density control strategy. Specifically, determining a density control strategy based on a density process type includes: when the early warning type is data deviation early warning, the control strategy is based on insulating gas pressure data at 20 ℃ to correct the pointer displacement sensor; when the early warning type is data error early warning, the control strategy is to replace the density relay body.
With continued reference to fig. 1, the data integration module 8 includes: an integration sub-module 81, a wireless transmission sub-module 82, and a power supply sub-module 83; the integration sub-module 81 is configured to receive density data, temperature data, insulating gas pressure data at 20 ℃, component and component content data of the decomposed product, and micro water data, and transmit the density data, the temperature data, the insulating gas pressure data at 20 ℃, component and component content data of the decomposed product, and micro water data to the wireless transmission sub-module 82, that is, all sensor data are collected and transmitted to the wireless transmission sub-module 82. The wireless transmission sub-module 82 is used for transmitting density data, temperature data, insulating gas pressure data at 20 ℃, component and component content data of decomposition products and micro water data to the terminal in a wireless transmission mode, so that wireless transmission of data of all sensors and a wireless receiving host can be realized, and the connection mode of the original density relay is not changed and convenient installation is realized in a wireless communication mode. The power supply sub-module 83 is used for supplying power, and can adopt a power supply conversion module (24V to 3.6V) or directly adopts a high-efficiency lithium battery to supply power to the circuit unit according to the field requirement, and can also adopt a solar power supply mode and an electromagnetic induction power supply mode to supply power to the relay unit 24, the integration sub-module 81 and the like. The relay unit 24 is connected with the integrated sub-module 81 through a cable, and the junction box 6 can be connected with the integrated sub-module 81 through a cable, and then connected with an external cable, so as to realize the connection of signals and power sources.
In this embodiment, the data acquisition unit 4 may be provided with a connection terminal 54 for connecting to the data integration module 8 to achieve power supply and data remote transmission.
In summary, the insulating gas non-electric parameter on-line monitoring device provided in this embodiment realizes connection between the device and a gas-insulated power device through the connection interface 1, and can realize extraction of gas so as to realize on-line monitoring of insulating gas; the density of the insulating gas is displayed through the density relay body 2, and the density data of the insulating gas is obtained through the pointer displacement sensor 3; the insulating gas is guided into the gas circulation bin 4 through the gas circulation bin 4 and flows along the gas circulation bin 4 and then guided into the gas passage 11 to flow out into the gas insulation power equipment, so that the circulation flow of the insulating gas is realized; the insulating gas in the gas circulation bin 4 is monitored on line through the data acquisition module 5, so that temperature and pressure data of the insulating gas, micro-water data of the insulating gas and component content data of decomposition products of the insulating gas are obtained, the integration of multi-parameter and on-line monitoring of the insulating gas is realized, multi-parameter monitoring of the insulating gas comprising density, temperature, pressure, micro-water and decomposition products can be realized, and the problems that the monitoring quantity of the existing density relay is single and the manual recording of data is needed so that the workload is large are solved. The device also has the following advantages:
(1) Under the condition of not changing the original gas path interface and electrical connection, the insulation multi-parameter on-line monitoring and the gas density relay are integrated, so that the device has the relay function and the multi-parameter on-line monitoring function.
(2) The insulating gas non-electric monitoring parameters comprise density, temperature, pressure, micro water and decomposition products, the monitoring quantity is complete and various, and the multi-dimension reflects the running state of the insulating gas.
(3) And the pointer displacement sensor is used for sensing the change of the density data, the mechanical part and the electronic part are completely consistent in reading the data, and the complete correspondence between the mechanical signal and the electronic signal is realized. Meanwhile, a temperature and pressure sensor is arranged to sense the temperature and pressure of the insulating gas, a SF6 temperature and pressure formula is utilized to obtain P20, the two groups of data can be subjected to contrast self-checking, and meanwhile, the temperature monitoring can provide basic data for liquefaction early warning; wherein P20 is an insulating gas pressure value corrected to 20 ℃.
(4) The design of the gas path unit is reasonable and ingenious, the distribution design of the sensors can realize accurate and reliable sensing of various parameters, the pointer displacement sensor is positioned near the pointer of the dial plate, the change condition of the pointer displacement can be comprehensively reflected, the temperature and pressure sensor is positioned near the gas inlet, the temperature and pressure condition of the atmosphere chamber can be most directly reflected, the micro water and decomposition product sensor is positioned in the gas circulation bin, the effective monitoring of micro water and decomposition products of circulating gas can be realized, the design of the air release port can realize the removal of air in the gas path, and the monitoring analysis of the gas in the gas chamber can be more accurately carried out.
(5) The device adopts the wireless communication module to carry out the communication with the host computer, and the remote transmission part power supply can adopt power conversion module or high-power battery to carry out, does not change original wiring mode, like the replacement of the density relay meter in the existing station, does not have loaded down with trivial details wiring, convenient and fast.
It should be noted that, in the description of the present invention, terms such as "upper," "lower," "left," "right," "inner," "outer," and the like indicate directions or positional relationships based on the directions or positional relationships shown in the drawings, which are merely for convenience of description, and do not indicate or imply that the apparatus or elements must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.
Furthermore, it should be noted that, in the description of the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention can be understood by those skilled in the art according to the specific circumstances.
It will be apparent to those skilled in the art that various modifications and variations can be made to the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Claims (5)
1. An insulating gas non-electrical parameter on-line monitoring device, characterized by comprising:
the connecting interface is internally provided with a gas passage and is used for connecting a gas chamber gas port of the gas-insulated power equipment so as to enable insulating gas in the gas-insulated power equipment to flow into the gas passage;
the density relay body is internally provided with a density detection passage which is communicated with the gas passage and is used for detecting and displaying the density of the insulating gas in the density detection passage; the density relay body is provided with a mechanical dial plate, and the mechanical dial plate is provided with scales and pointers for displaying the density of the insulating gas;
the pointer displacement sensor is arranged on the mechanical dial and is used for adopting the displacement principle of measuring the pointer and the zero value, corresponding the pointer displacement to the dial scale, realizing the electronization of the measured value of the mechanical meter and obtaining the density data of the insulating gas;
The gas circulation bin is communicated with the gas passage and is used for guiding the insulating gas into the gas circulation bin, guiding the insulating gas into the gas passage after flowing along the gas circulation bin and flowing out into the gas insulation power equipment to realize the circulation flow of the insulating gas; the gas circulation bin is provided with a gas inlet and a gas discharge port, and the gas inlet and the gas discharge port are communicated with the gas passage; insulating gas in the gas-insulated power equipment flows through the gas inlet from the gas passage, flows into the gas circulation bin, flows from upstream to downstream along the gas circulation bin, flows back into the gas passage from the gas discharge port, and flows back into the gas-insulated power equipment along the gas passage to form a gas circulation channel;
the data acquisition module is used for carrying out on-line monitoring on the insulating gas in the gas circulation bin to acquire temperature and pressure data of the insulating gas, composition and composition content data of decomposition products of the insulating gas and micro-water data of the insulating gas;
the data acquisition module comprises:
the temperature and pressure sensor is arranged at the upstream of the gas circulation bin and is used for detecting the temperature and pressure of the insulating gas in the gas circulation bin, acquiring temperature data and pressure data of the insulating gas and determining the pressure data of the insulating gas corrected to 20 ℃ based on the temperature data and the pressure data of the insulating gas;
The decomposition product sensor is arranged at the downstream of the gas circulation bin and is used for monitoring the decomposition products of the insulating gas and acquiring the components and the component content data of the decomposition products of the insulating gas;
the micro-water sensor is arranged between the temperature and pressure sensor and the decomposition product sensor and is used for carrying out micro-water monitoring on the insulating gas to obtain micro-water data of the insulating gas;
the apparatus further comprises:
the self-checking module is respectively connected with the pointer displacement sensor and the temperature and pressure sensor, and is used for receiving the density data of the insulating gas and the pressure data of the insulating gas at 20 ℃ and carrying out self-checking on the density data based on the density data of the insulating gas and the pressure data of the insulating gas at 20 ℃;
the density data self-checking is performed based on the density data of the insulating gas and the pressure data of the insulating gas at 20 ℃, and the density data self-checking method comprises the following steps:
determining a difference Deltaρ between the insulating gas and the insulating gas at 20 ℃ based on the density data of the insulating gas and the pressure data of the insulating gas, and determining a density processing type based on the difference;
determining a density control strategy based on the density processing type, and performing self-checking adjustment based on the density control strategy;
The determining the density processing type based on the difference value comprises the following steps:
setting a first preset difference Deltaρ1 and a second preset difference Deltaρ2, and 0 < Deltaρ1 < Deltaρ2;
when Deltaρ1 is less than or equal to Deltaρ < Deltaρ2, determining the early warning type as data deviation early warning;
when the delta rho is more than or equal to delta rho 2, determining the early warning type as data error early warning;
the determining a density control strategy based on the density processing type comprises the following steps:
when the early warning type is data deviation early warning, the control strategy is based on insulating gas pressure data at 20 ℃ to correct the pointer displacement sensor;
when the early warning type is data error early warning, the control strategy is to replace the density relay body.
2. The insulating gas non-electrical parameter on-line monitoring device of claim 1, further comprising:
the data integration module is connected with the data acquisition module and is used for receiving density data, temperature data, insulating gas pressure data at 20 ℃, component and component content data of decomposed products and micro water data;
the early warning type determining module is connected with the data integrating module and is used for determining the early warning type based on density data, temperature data, insulating gas pressure data at 20 ℃, components and component content data of decomposition products and micro water data;
And the control module is used for determining a control strategy associated with the early warning type so as to control the gas-insulated power equipment based on the control strategy.
3. The insulating gas non-electrical parameter on-line monitoring device according to claim 2, wherein the determining the pre-warning type based on the density data, the temperature data, the insulating gas pressure data at 20 ℃, the component and component content data of the decomposed product, and the micro-water data comprises:
when the solid insulation is corroded based on a preset corrosion rule, determining that the early warning type is fixed insulation corrosion early warning;
when the overheat fault is determined to occur based on a preset overheat rule, determining that the early warning type is overheat fault early warning;
when the occurrence of the discharge fault is determined based on a preset discharge rule, determining the early warning type as discharge fault early warning;
wherein, the preset erosion rule is: determining that the fixed insulation is eroded when it is determined that the component content of CS2 continuously increases within the first preset time period based on the component and component content data of the decomposition product, and the component content of CS2 is greater than the first preset content;
the preset overheat rule is as follows: determining that an overheat fault occurs when the component content of SO2 is determined to be greater than the second preset content, the component content of H2S is determined to be greater than the third preset content and the temperature is determined to be greater than the preset temperature value based on the component and component content data and the temperature data of the decomposed product;
The preset discharging rule is as follows: determining that a discharge fault occurs when the component content of SO2 is greater than a fourth preset content, the component content of H2S is greater than a fifth preset content, and the component content of C3F8 is greater than a sixth preset content, and CO2 based on the component and component content data of the decomposition product;
the second preset content is smaller than the fourth preset content, and the third preset content is smaller than the fifth preset content.
4. The insulating gas non-electrical parameter on-line monitoring device of claim 3, wherein the determining a control strategy associated with the pre-warning type comprises:
when the early warning type is fixed insulation corrosion early warning, the control strategy is power failure and overhauls the internal insulation condition of the equipment;
when the early warning type is overheat fault early warning, the control strategy is power failure, overheat fault points are searched, overheat fault points are processed, and overheat faults are eliminated;
when the early warning type is discharge fault early warning, the control strategy is to find a discharge point, process the discharge point and eliminate the discharge fault.
5. The insulating gas non-electric parameter on-line monitoring device according to claim 1, wherein,
a drainage fan is arranged in the gas circulation bin and used for conducting drainage on the insulating gas so that the insulating gas flows from upstream to downstream in the gas circulation bin after being discharged from the gas passage and flows back to the gas passage in a circulating way;
And the gas circulation bin is also provided with a gas discharge port for discharging air.
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