CN113820452A - Method, Apparatus and System for Assessing Insulation Deteriorating Gas in Switchgear - Google Patents

Abstract

The present application relates to a method for evaluating insulation deterioration gas in switch cabinets, including: acquiring multiple characteristic values of insulation deterioration gas in switch cabinets, where the multiple characteristic values at least include gas components and component concentrations; correcting formulas according to preset concentration and A plurality of characteristic values are used to obtain a component concentration correction value of the insulation-deteriorating gas; and a first evaluation result of the insulation-degrading gas is obtained according to the gas components and the concentration correction value. In the present invention, by correcting the obtained volume value of the gas concentration of degraded insulation, the state of the switchgear can be evaluated with the corrected gas component concentration, and the evaluation result can be corrected, which greatly improves the internal discharge condition and insulation state of the switchgear. accuracy of judgment.

Description

Method, Apparatus and System for Assessing Insulation Deteriorating Gas in Switchgear

technical field

The present application relates to the technical field of insulation deterioration gas detection, and in particular, to a method, device and system for evaluating insulation deterioration gas in switch cabinets.

Background technique

With the increasing expansion of the power grid and the popularization and promotion of unattended management mode and comprehensive automation in power distribution rooms, the impact and loss of power outages caused by switchgear failures on production and life are also increasing. In the long-term operation of the switchgear, there must be insulation deterioration caused by electrical, thermal, chemical and abnormal conditions, resulting in a reduction in the electrical insulation strength, and eventually failure, accompanied by the production of characteristic gases and regular changes, different switches. The operating state of the cabinet will produce different insulation deterioration gas states. Therefore, by monitoring the insulation deterioration gas in the switchgear, it is possible to diagnose and warn the latent faults of the switchgear in time, thereby reducing the occurrence of switchgear failures.

SUMMARY OF THE INVENTION

Based on this, it is necessary to provide a method, device and system for evaluating the insulation deterioration gas in the switch cabinet, which can monitor and give an early warning to the insulation deterioration gas in the switch cabinet, in view of the above technical problems.

A method for evaluating insulation deterioration gas in switchgear, comprising:

Obtain multiple characteristic values of the insulation deterioration gas in the switch cabinet, and the multiple characteristic values at least include gas components and component concentrations;

Obtain the component concentration correction value of the insulation deterioration gas according to the preset concentration correction formula and a plurality of characteristic values;

The first evaluation result of the insulation deterioration gas is obtained based on the gas composition and the concentration correction value.

In one of the embodiments, the plurality of characteristic values further include temperature values, and the method further includes:

The second evaluation result of the insulation-deteriorating gas is obtained based on the gas composition and the temperature value.

In one embodiment, it also includes:

Corresponding warning information is generated according to the first evaluation result and the second evaluation result, and the warning information is sent to the user, so that the user can perform maintenance according to the warning information.

In one embodiment, before acquiring a plurality of characteristic values of the insulation deterioration gas in the switch cabinet, the method further includes:

Control the air pump to extract the insulation deterioration gas of the target volume value in the switch cabinet;

Obtain multiple characteristic values of insulation-deteriorating gases in switchgear, including:

Obtain multiple characteristic values of the insulation-deteriorating gas extracted from the switchgear.

In one embodiment, the method further includes:

A supplementary gas command carrying the target volume value is generated, and the supplemental gas command is used to instruct the air pump to supplement the switchgear with insulating gas whose target volume value is not degraded.

In one embodiment, the concentration correction formula includes:

Among them, ρ _x is the corrected gas component concentration, ρ _max is the obtained maximum value of the insulation degradation gas component concentration, T is the obtained insulation degradation gas temperature value, RH is the obtained insulation degradation gas humidity value, Pa is the pressure value of the obtained insulation deterioration gas, V ₁ is the gas flow value during the pumping process, V ₂ is the gas flow value during the obtaining process, O ^2- is the detected trace oxygen content value, α ₁ , α ₂ , α ₃ , α ₄ , α ₅ , α ₆ , and α ₇ are correction coefficients, respectively.

A device for evaluating insulation deterioration gas in a switch cabinet, the device includes:

The acquisition module is used to acquire multiple characteristic values of the insulation deterioration gas in the switch cabinet;

a correction module, configured to correct the concentration of components in the degraded insulation gas according to a preset concentration correction formula and a plurality of characteristic values, so as to obtain a correction value of the concentration of components in the degraded insulation gas;

The evaluation module is configured to obtain a first evaluation result of the insulation degradation gas according to the detected gas composition and concentration correction value in the insulation degradation gas.

A system for evaluating insulation deterioration gas in switch cabinets, comprising:

a detection device for detecting and sending a plurality of characteristic values of the degraded insulation gas in the switch cabinet, the plurality of characteristic values at least including gas components and component concentrations;

The microprocessor is connected to the detection device and is used for receiving multiple characteristic values; according to the preset concentration correction formula and the multiple characteristic values, the concentration of components in the degraded insulation gas is corrected to obtain the correction of the concentration of components in the degraded insulation gas value; obtain the first evaluation result of the insulation degradation gas according to the detected gas composition and concentration correction value in the insulation degradation gas;

The air pump is respectively connected with the detection device and the microprocessor, and is used for extracting the insulation deterioration gas in the switch cabinet to the detection device under the control of the microprocessor.

In one of the embodiments, the detection device includes:

The air duct, the air inlet of the air duct is connected with the air pump to receive the degraded insulation gas to be detected, the air outlet of the air duct is used to discharge the detected degraded insulation gas, and the air duct is used to form a gas detection path; the electrochemical sensor The module, connected with the microprocessor, is arranged on the gas detection channel, and is used for detecting a plurality of characteristic values of the gas with degraded insulation in the air duct;

The first gas flow detection module is connected with the microprocessor and is arranged at the air inlet, and is used for detecting the first gas flow value of the insulating degraded gas during the pumping process;

The second gas flow detection module is connected to the microprocessor, and is arranged at the gas outlet, and is used for detecting the second gas flow value of the insulation deterioration gas passing through the detection device.

In one embodiment, the system further includes:

The exhaust gas treatment device is connected with the gas outlet of the air duct, and is used for synchronous exhaust gas treatment of the detected insulation deterioration gas.

The method for evaluating the insulation deterioration gas in the switchgear includes acquiring multiple characteristic values of the insulation deterioration gas in the switchgear, where the multiple characteristic values at least include gas components and component concentrations; and obtaining according to a preset concentration correction formula and multiple characteristic values The component concentration correction value of the insulation deterioration gas; the first evaluation result of the insulation deterioration gas is obtained according to the gas composition and the concentration correction value. Since the evaluation of the insulation deterioration gas can be used as the evaluation of the operation state of the switchgear, the present invention corrects the obtained volume value of the concentration of the insulation deterioration gas, and evaluates the state of the switchgear with the corrected gas composition concentration. Correcting the evaluation results greatly improves the accuracy of judging the internal discharge and insulation state of the switchgear, and is more suitable for the evaluation of the deterioration of the insulation performance state caused by the gradual development of equipment partial discharge faults.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application or in the traditional technology, the following briefly introduces the accompanying drawings that are used in the description of the embodiments or the traditional technology. Obviously, the drawings in the following description are only the For some embodiments of the application, for those of ordinary skill in the art, other drawings can also be obtained according to these drawings without any creative effort.

Fig. 1 is one of the schematic flow charts of the method for evaluating insulation deterioration gas in switchgear in one embodiment;

Fig. 2 is the second schematic flow chart of the method for evaluating the insulation deterioration gas of the switchgear in one embodiment;

Fig. 3 is the third schematic flow chart of the method for evaluating the insulation deterioration gas of the switchgear in one embodiment;

4 is a schematic structural diagram of a device for evaluating insulation deterioration gas in a switch cabinet in another embodiment;

FIG. 5 is a schematic diagram of an evaluation system for insulation deterioration gas in a switch cabinet in one embodiment.

Detailed ways

In order to facilitate understanding of the present application, the present application will be described more fully below with reference to the related drawings. Embodiments of the present application are presented in the accompanying drawings. However, the application may be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field to which this application belongs. The terms used herein in the specification of the application are for the purpose of describing specific embodiments only, and are not intended to limit the application.

It will be understood that the terms "first", "second", etc. used in this application may be used herein to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish a first element from another element.

Spatial relational terms such as "under", "below", "below", "under", "above", "above", etc., in This may be used to describe the relationship of one element or feature to other elements or features shown in the figures. It should be understood that in addition to the orientation shown in the figures, the spatially relative terms encompass different orientations of the device in use and operation. For example, if the device in the figures is turned over, elements or features described as "below" or "beneath" or "beneath" other elements or features would then be oriented "above" the other elements or features. Thus, the exemplary terms "below" and "under" can encompass both an orientation of above and below. In addition, the device may also be otherwise oriented (eg, rotated 90 degrees or at other orientations) and the spatial descriptors used herein interpreted accordingly.

It should be noted that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or connected to the other element through intervening elements. In addition, the "connection" in the following embodiments should be understood as "electrical connection", "communication connection" and the like if there is transmission of electrical signals or data between the objects to be connected.

As used herein, the singular forms "a," "an," and "the/the" can include the plural forms as well, unless the context clearly dictates otherwise. It should also be understood that the terms "comprising/comprising" or "having" etc. designate the presence of stated features, integers, steps, operations, components, parts or combinations thereof, but do not preclude the presence or addition of one or more Possibilities of other features, integers, steps, operations, components, parts or combinations thereof.

In the description of this specification, reference to the description of the terms "some embodiments," "other embodiments," "ideal embodiments," etc. means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in the present specification. at least one embodiment or example of the invention. In this specification, schematic descriptions of the above terms do not necessarily refer to the same embodiment or example.

In one of the embodiments, as shown in FIG. 1 , a method for evaluating the insulation deterioration gas of a switchgear is provided. Steps S100-S300 are included.

Step S100 , acquiring multiple characteristic values of the insulating degraded gas in the switch cabinet, where the multiple characteristic values at least include gas components and component concentrations.

Step S200, obtaining a component concentration correction value of the insulating degraded gas according to a preset concentration correction formula and a plurality of characteristic values.

In the existing gas component detection technologies, such as infrared spectrum detection technology, electrochemical sensor detection technology, etc., only focus on the detection of gas components. For fault diagnosis of the cabinet, due to the diffusion effect of gas molecules in the switch cabinet, the sample gas taken by the sampling system of the existing device may not fully represent the composition or concentration of the gas inside the switch cabinet. Without considering the influence of gas temperature, humidity and other characteristics on the concentration of insulation degradation gas, for example, ventilation and heat dissipation of switch cabinets will dilute the concentration of insulation degradation gas caused by partial discharge, which will lead to the calculated gas The low generation rate will eventually affect the judgment of the internal discharge of the switchgear and the monitoring of the insulation state of the switchgear. Therefore, it is necessary to correct the concentration of the gas components by combining the basic characteristics of the insulation deterioration gas and the correction formula, so as to improve the detection accuracy.

Step S300, obtaining a first evaluation result of the insulating degraded gas according to the gas composition and the concentration correction value.

Among them, the insulating gas in the switch cabinet mainly produces degraded decomposition products such as O ₃ , NO, NO ₂ , and N ₂ O ₅ when partial discharge occurs, while NO, N ₂ O ₅ and other intermediate products are the intermediate products of the decomposition reaction. O ₃ and NO gas are used as the characteristic components for the fault judgment of the partial discharge of the switchgear, while NO and N ₂ O ₅ gases are used as the characteristic components for the fault stage judgment of the partial discharge of the switch cabinet.

In the above method, the concentration of the obtained gas components is corrected according to the composition, temperature, humidity and other parameters of the measured gas by considering the diffusion effect of gas molecules in the independent gas chamber of the switch cabinet and the influence of the difference in gas flow rate, and then corrected according to the gas components and components. Obtaining the first evaluation result of the insulation deterioration gas of the switchgear can improve the detection accuracy of the insulation deterioration gas of the switchgear, and realize the monitoring and evaluation analysis of the latent fault types and development stages of different gas chambers of the switchgear.

In one embodiment, the concentration correction formula includes:

Among them, ρ _x is the corrected gas component concentration, ρ _max is the obtained maximum value of the insulation degradation gas component concentration, T is the obtained insulation degradation gas temperature value, RH is the obtained insulation degradation gas humidity value, Pa is the pressure value of the obtained insulation deterioration gas, V ₁ is the gas flow value during the pumping process, V ₂ is the gas flow value during the obtaining process, O ^2- is the detected trace oxygen content value, α ₁ , α ₂ , α ₃ , α ₄ , α ₅ , α ₆ , and α ₇ are correction coefficients, respectively.

In one of the embodiments, as shown in FIG. 2 , a method for evaluating the insulation deterioration gas in a switchgear is provided, wherein the above-mentioned acquisition of multiple characteristic values of the insulation deterioration gas also includes a temperature value, and the evaluation of the switchgear insulation deterioration gas The method also includes step S400.

Step S400, obtaining a second evaluation result according to the gas composition and the temperature value.

Among them, the failure of switchgear is not only the phenomenon of partial discharge, but also the damage of solid insulation. For those switch cabinets in the early stage of failure, because the insulation deterioration gas does not change significantly, for example, there is only obvious temperature rise in the early stage of overheating failure, and the concentration of CO in the insulation deterioration gas basically does not change, the existing technical solutions will appear failure phenomenon. And can not realize the judgment of switchgear failure stage. After the solid insulating material is damaged, it will be accompanied by an obvious temperature rise first, and then CO, CO ₂ and other gases will be slowly generated. Therefore, CO can be used as the characteristic component of the fault judgment of the damaged solid insulating material of the switch cabinet. , Since CO ₂ is a gas with a large proportion in the air, it cannot be used as a characteristic component for the detection of damage to solid insulating materials. Therefore, it is necessary to use temperature as a characteristic parameter for judging the fault stage of partial discharge in the switchgear.

Specifically, when a partial discharge fault occurs in the vacuum circuit breaker chamber of the switchgear, the internal insulation deterioration gas SF ₆ is degraded and decomposed into gases such as SO ₂ and H ₂ S. SO ₂ and H ₂ S can be used as the partial discharge of the vacuum circuit breaker chamber. The characteristic component of fault judgment; when the failure of the solid insulating material damage occurs in the vacuum circuit breaker room of the switchgear, SF ₆ gradually decomposes with the increase of temperature: when the local overheating temperature is 260 ℃, SF ₆ begins to decompose, this stage It will be accompanied by a small amount of SO ₂ , SO ₂ F ₂ and other gases; as the superheat temperature rises, SO ₂ will gradually increase and become the main component. When the local superheat temperature reaches 340 ℃, H ₂ S will be produced in the gas. Therefore, H ₂ S, SO ₂ gas components and temperature values can be used as the characteristic components for the damage of the solid insulating material in the vacuum circuit breaker chamber and its stage judgment.

By increasing the analysis and evaluation of gas composition and temperature, the above method forms the second evaluation result obtained according to the gas composition and temperature value, which can improve the more accurate monitoring and evaluation analysis of different gas chamber latent fault types and development stages of the switchgear.

In one of the embodiments, as shown in Table 1, a switchgear latent fault stage evaluation model is provided. Among them, the model provides a fault evaluation model for evaluating the different equipment rooms in the switchgear according to the composition, the corrected concentration value and the temperature value of the above-mentioned insulation deterioration gas.

Among them, X ₁ %-X ₂₃ % and T ₁ -T ₃ are all undetermined coefficients, and the specific values can be obtained from laboratory tests. It needs to be explained that, for example, the expression "20% carbon dioxide concentration" means that the number or mass of carbon dioxide molecules accounts for 20% of the gas mixture in question. The user can comprehensively evaluate the status of the switchgear through the above evaluation model of the switchgear latent fault stage.

Table 1: Evaluation model of switchgear latent fault stage

In one of the embodiments, continuing to refer to FIG. 2 , the method for evaluating the insulation deterioration gas of the switch cabinet further includes step S500 .

Step S500, generating corresponding warning information according to the first evaluation result and the second evaluation result, and sending the warning information to the user, so that the user can perform maintenance according to the warning information.

Among them, due to the insulation gas such as SF ₆ in the switchgear and its degradation decomposition gas such as sulfur dioxide (SO ₂ ), hydrogen sulfide (H ₂ S), hydrogen fluoride (HF), thionyl fluoride (SOF ₂ ), nitric oxide (NO), carbon monoxide (CO), etc. are all toxic gases. The addition of an early warning scheme can prevent the maintenance personnel from directly overhauling the switch cabinet without knowing it when a serious failure occurs, thus endangering the life and health of the maintenance workers. At the same time, early warning work can also be done in the early stage of failure, which can effectively avoid the occurrence of larger accidents and reduce losses.

In one of the embodiments, as shown in FIG. 3 , a method for evaluating the insulation deterioration gas of a switch cabinet is provided. Before step S100, step S600 is also included.

Step S600, controlling the air pump to extract the insulation degraded gas of the target volume value in the switch cabinet;

Step S100, acquiring multiple characteristic values of the insulation-deteriorating gas in the switch cabinet, including:

In step S110, a plurality of characteristic values of the insulating degraded gas extracted from the switch cabinet are acquired.

In one of the embodiments, continuing to refer to FIG. 3 , the method for evaluating the insulation deterioration gas of a switch cabinet further includes step S700 .

Step S700 , generating a gas supplementation instruction carrying a target volume value, and the gas supplementation instruction is used to instruct the air pump to supplement the switch cabinet with insulating gas whose target volume value is not degraded.

In the above method, after the corresponding degraded insulation gas in the switch cabinet is extracted, the corresponding non-degraded insulating gas can be supplemented into the switch cabinet as the corresponding insulating medium, and at the same time, it is convenient for re-detection, and the switch cabinet contains residual decomposed gas. , which affects the detection accuracy.

It should be understood that although the steps in the flowcharts of FIGS. 1-3 are sequentially displayed according to the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless explicitly stated herein, the execution of these steps is not strictly limited to the order, and these steps may be performed in other orders. Moreover, at least a part of the steps in FIG. 1 to FIG. 3 may include multiple steps or multiple stages, and these steps or stages are not necessarily executed and completed at the same time, but may be executed at different times. The order of execution is also not necessarily sequential, but may be performed alternately or alternately with other steps or at least a portion of the steps or stages within the other steps.

In one of the embodiments, as shown in FIG. 4 , a device 100 for evaluating insulation deterioration gas in a switch cabinet is provided, which is applied to the above method. The device for evaluating insulation deterioration gas in a switch cabinet includes an acquisition module 110 and a correction module 120 . and evaluation module 130. The obtaining module 110 is used to obtain multiple characteristic values of the insulation degraded gas in the switch cabinet; the correction module 120 is used to correct the concentration of the components in the insulation degradation gas according to the preset concentration correction formula and the multiple characteristic values, so as to obtain the insulation degradation gas. The component concentration correction value in the degraded gas; the evaluation module 130 is configured to obtain the first evaluation result of the insulation deterioration gas according to the detected gas components in the insulation deterioration gas and the concentration correction value.

The above-mentioned device corrects the concentration value of the insulation degradation gas by obtaining a plurality of characteristic values of the insulation degradation gas in the switch cabinet, and evaluates the insulation degradation gas in the switch cabinet with the corrected component concentration value and gas composition. Improve the evaluation accuracy of the insulation deterioration gas state in the switchgear, and achieve a more accurate monitoring effect of the switchgear state.

For the specific limitation of the device for evaluating the insulation deterioration gas of the switchgear, please refer to the definition of the method for evaluating the insulation deterioration gas of the switchgear above, which will not be repeated here. All or part of the modules in the device for evaluating the insulation-deteriorating gas in the switch cabinet can be implemented by software, hardware, and combinations thereof. The above modules can be embedded in or independent of the processor in the computer device in the form of hardware, or stored in the memory in the computer device in the form of software, so that the processor can call and execute the operations corresponding to the above modules. It should be noted that, the division of modules in the embodiments of the present application is schematic, and is only a logical function division, and there may be other division manners in actual implementation.

In one of the embodiments, as shown in FIG. 5 , an evaluation system 200 for insulating degraded gas in a switch cabinet is provided. It should be noted that, in order to make the example diagram concise, many connection relationships are not shown in the figure, and the specific connection relationships are not shown. Please refer to the manual. The system 200 for evaluating the insulation deterioration gas of a switch cabinet includes a detection device 230 , a microprocessor 250 and a suction pump 210 . The detection device 230 is used to detect and send a plurality of characteristic values of the insulation degraded gas in the switch cabinet, and the plurality of characteristic values at least include gas components and component concentrations; the microprocessor 250 is connected to the detection device, and the microprocessor 250 is used for receiving multiple The microprocessor 250 also corrects the concentration of components in the degraded insulation gas according to the preset concentration correction formula and the plurality of characteristic values, so as to obtain the correction value of the concentration of the components in the degraded insulation gas; the microprocessor 250 also according to The gas composition and concentration correction value in the detected insulation deterioration gas are used to obtain the first evaluation result of the insulation deterioration gas; the suction pump 210 is connected to the detection device 230 and the microprocessor 250 respectively, and the suction pump 210 is used in the microprocessor 250 The insulation deterioration gas in the switch cabinet is extracted to the detection device 230 under the control of .

In one embodiment, continuing to refer to FIG. 5 , the detection device 230 includes an air duct, a first gas flow detection module 231 and a second gas flow detection module 237 . The air duct, the air inlet of the air duct is connected to the air pump 210 to receive the degraded insulation gas to be detected, the air outlet of the air duct is used to discharge the detected degraded insulation gas, and the air duct is used to form a gas detection path; electrochemical The sensor module 236, connected with the microprocessor 250, is arranged on the gas detection passage, and is used for detecting a plurality of characteristic values of the gas with degraded insulation in the air duct; the first gas flow detection module 231 and the microprocessor 250 are arranged in the inlet At the gas outlet, the first gas flow detection module 231 is used to detect the first gas flow value of the insulating degraded gas during the pumping process; the second gas flow detection module 237 is connected to the microprocessor 250 and is located at the gas outlet, and the second gas flow detection module 237 is connected to the microprocessor 250. The second gas flow detection module 237 is used to detect the second gas flow value of the insulation deterioration gas passing through the detection device 230 .

Among them, because the above-mentioned evaluation system of the switch cabinet insulation deterioration gas is divided into the air extraction process of the air pump and the detection process of the detection device, the gas flow rate of the gas in the air extraction process of the air pump is mainly affected by the air pump. In the device, the flow rate of the gas is no longer affected by the suction pump. Therefore, there is a certain difference between the gas volume passing through the suction channel per unit time and the gas volume passing through the detection channel per unit time, and the gas flow rate affects the detection gas. key factor in concentration.

The above detection device can improve the accuracy of the corrected gas concentration by setting the first gas flow detection module and the second gas flow detection module to collect the gas flow in the process of gas extraction and detection respectively, thereby improving the overall accuracy of the switchgear state evaluation. sex.

In one of the embodiments, continuing to refer to FIG. 5 , the system 200 for evaluating the insulation deterioration gas of a switch cabinet further includes an exhaust gas treatment device 290 . The exhaust gas treatment device 290 is connected to the gas outlet of the air duct, and the exhaust gas treatment device 290 is used to perform synchronous exhaust gas treatment on the detected insulation deterioration gas. Simultaneous exhaust gas treatment during detection can improve detection efficiency and save exhaust gas treatment time.

In one of the embodiments, continuing to refer to FIG. 5 , a system 200 for evaluating insulation deterioration gas in a switch cabinet is provided, including an air pump 210 , a sampling control device 220 , a sampling gas total amount control module 221 , a gas channel control module 222 and Sampled gas definition module 223, detection device 230, first gas flow detection module 231, high-precision temperature sensor module 232, humidity sensor module 233, pressure sensor module 234, trace oxygen monitoring module 235, electrochemical sensor module 236, second gas Flow monitoring module 237 , industrial collector 240 , microprocessor 250 , peripheral display 260 , standard gas tank 270 , insulating gas tank 280 , exhaust gas treatment device 290 , exhaust gas treatment tank 291 and suction module 292 .

Among them, the air pump 210 is equipped with a self-sealing plug, and the air intake pipe of the air pump is composed of 9 separate air intake pipes, which are evenly connected to the high-voltage room, the bus bar room and the vacuum circuit breaker room of the switch cabinet in three groups, and the air outlet pipe is connected to the gas detection device. . The air inlet of the air pump 210 is designed with two channels, the upper part is the gas sampling channel, and the lower part is the sample gas channel, which is controlled by the self-sealing plug to open and close.

The sampling control device 220 is connected with the microprocessor 250 and the lower part of the air pump 210 through a cable, wherein the sampling control device 220 is controlled by the microprocessor 250 to control the air extraction of the air pump 210 . The sampling control device 220 includes: a sampling gas total amount control module 221 , a gas channel control module 222 and a sampling gas definition module 223 . The sampling gas total amount control module 221 in the sampling gas control module 220 controls the suction pump 210 to inhale; the gas channel control module 222 controls the opening and closing of nine channels of the intake pipe of the suction pump 210; the sampling gas definition module 223 controls the nine channels of the intake pipe The gases of each channel are logically defined, for example, the preset logical categories are No. 1-3 of high-pressure room gas, No. 4-6 of bus-bar room gas, and No. 7-9 of vacuum circuit breaker room.

The detection device 230 includes a first gas flow detection module 231 , a high-precision temperature sensor module 232 , a humidity sensor module 233 , a pressure sensor module 234 , a trace oxygen monitoring module 235 , an electrochemical sensor module 236 , and a second gas flow rate, which are connected in sequence through a trachea. Monitoring module 237 .

The industrial collector 240 is connected to the first gas flow detection module 231, the high-precision temperature sensor module 232, the humidity sensor module 233, the pressure sensor module 234, the trace oxygen monitoring module 235, the electrochemical sensor module 236, the second gas flow monitoring module through the cable 237 and the microprocessor 250 are connected, and the industrial collector 240 is controlled by the microprocessor 250 to obtain data information according to each detection module in the detection device 230, and to receive the type, concentration, temperature of gas components in multiple channels and multiple dimensions. Humidity and other parameters; wherein, the built-in A/D conversion circuit can convert the collected data information into digital signals and transmit them to the microprocessor 250 .

Microprocessor 250 is connected to industrial collector 240 . The microprocessor adopts STM32 single-chip microprocessor, which has the advantages of high performance and low power consumption. The good fast processing capability of STM32 is used to improve the data processing speed and ensure the fast calculation results on the spot. The microprocessor 250 is connected to the peripheral display 260 , the sampling control device 220 and the industrial collector 240 through cables, and is used to receive various data uniformly and feed back on-site operation instruction information.

The gas tank includes a standard gas tank 270, an insulating gas tank 280, and a tail gas treatment tank 290. The standard gas tank 270 is connected to the air pump 210 through a gas pipe, and the standard gas is N gas, which is used for exhausting the residual gas in the device before gas detection _; insulation The gas tank 280 is connected to an external pressure device. _The insulating gas tank ₂₈₀ is fixed to the vacuum circuit breaker chamber of the switch cabinet through a gas pipe, and is connected to the sampling control device 220 through a cable. The insulation deterioration gas in the chamber is compensated in time. The exhaust gas treatment tank 291 is externally connected to the suction module 292, and is connected to the second gas flow monitoring module 237 through a gas pipe.

Among them, the standard gas tank 270, the insulating gas tank 280, and the exhaust gas treatment tank 291 are all connected with a pressure monitoring device. When the pressure exceeds or falls below the threshold, the information will be fed back to the microprocessor 250, and the microprocessor 250 will issue an early warning information. In addition, self-sealing taps are installed at the joints of each gas tank, each air inlet pipe and each air chamber to make good sealing measures.

The peripheral display 260 is embedded in the switch cabinet door, and an LCD screen can be selected. Through the function of displaying data on the peripheral display, it is convenient for the staff to see the data detected by the evaluation system of the insulation deterioration gas of the switch cabinet in real time, so as to make repairs quickly when a fault occurs.

In one of the embodiments, a method for evaluating switch cabinet insulation deterioration gas is provided, which is applied to the above-mentioned switch cabinet insulation deterioration gas evaluation system 200 . The method for evaluating the insulation deterioration gas of the switch cabinet includes steps S810-S880.

Step S810, calibration. The sampling control device 220 receives the calibration instruction sent by the microprocessor 250 to control the self-sealing plug of the air pump 210 to work, the air sampling channel is closed, and the sample gas channel is opened. Then, the sampling control device 220 controls the suction pump 210 to start to extract the standard gas in the standard gas tank 270; at the same time, the suction module 292 connected to the exhaust gas treatment tank 291 starts to work. After a period of time, firstly, the suction pump 210 stops working, the sample gas channel is closed, and the exhaust gas treatment device 290 continues to work.

Step S820, sampling. The sampling control device 220 receives the sampling instruction sent by the microprocessor 250 to control the self-sealing plug of the air pump 210 to open the air sampling channel. At the same time, the sampling gas definition module 223 of the sampling control device 220 starts to number the gases in the gas channel. And transmit the gas number information to the industrial collector 240 .

Step S830, detection. The detection device 230 receives the detection instruction sent by the microprocessor 250, and the first gas flow detection module 231, the high-precision temperature sensor module 232, the humidity sensor module 233, the pressure sensor module 234, the trace oxygen monitoring module 235, the electrical The chemical sensor module 236 and the second gas flow monitoring module 237 start to measure the first gas flow, temperature, humidity, gas pressure, trace oxygen content, gas composition, composition concentration, and second gas flow of the gas, and will collect the gas data information to the industrial collector 240.

Step S840, transmit. The industrial collector 240 receives the transmission instruction sent by the microprocessor 250 , so as to convert the collected gas number information and gas data information into digital signals and transmit them to the microprocessor 250 .

Step S850, processing. The microprocessor 250 compares the obtained gas characteristic values, including the temperature value, the humidity value, the pressure value, the first gas flow value, the second gas flow value, the trace oxygen content, the gas composition, and the gas composition concentration corrected by the composition concentration, The corrected gas component concentration value is obtained.

Step S860, evaluate. The microprocessor 250 screens the toxic gas concentration in it according to the corrected gas component concentration value, and then compares the gas component and the corrected gas component concentration value with the above-mentioned switchgear latent failure evaluation model, and then compares the switchgear cabinet latent failure evaluation model. status is assessed.

Among them, gas components such as sulfur dioxide (SO ₂ ), hydrogen sulfide (H ₂ S), hydrogen fluoride (HF), thionyl fluoride (SOF ₂ ), nitric oxide (NO), Carbon monoxide (CO) and the like are all toxic gases. Therefore, when obtaining gas components, the toxic gases can be screened and marked, and the toxic state of the gas can be evaluated according to the existing toxic gas composition table.

In step S870, the LCD liquid crystal display screen displays the detection data, and gives an early warning of faults and toxic gases, and notifies the centralized control center.

Step S880, after the detection is completed, the microprocessor 250 sends an end instruction to the sampling control device 220 to control the closing of the gas sampling channel. For example, if the detection site is a vacuum circuit breaker chamber, the microprocessor 250 will send the sampling and sampling control device 220 a gas replenishment instruction and the extracted gas volume value. Indoor insulating gas, the supplementary amount is the value of the extracted gas volume, and the channel is closed after the end.

The technical features of the above embodiments can be combined arbitrarily. In order to make the description simple, all possible combinations of the technical features in the above embodiments are not described. However, as long as there is no contradiction in the combination of these technical features It is considered to be the range described in this specification.

The above-mentioned embodiments only represent several embodiments of the present application, and the descriptions thereof are specific and detailed, but should not be construed as a limitation on the scope of the invention patent. It should be pointed out that for those skilled in the art, without departing from the concept of the present application, several modifications and improvements can be made, which all belong to the protection scope of the present application. Therefore, the scope of protection of the patent of the present application shall be subject to the appended claims.

Claims (10)

1. A method for evaluating insulation deterioration gas of a switch cabinet is characterized by comprising the following steps:

acquiring a plurality of characteristic values of insulation deterioration gas in a switch cabinet, wherein the plurality of characteristic values at least comprise gas components and component concentrations;

acquiring a component concentration correction value of the insulation deterioration gas according to a preset concentration correction formula and a plurality of characteristic values;

a first evaluation result of the insulation deterioration gas is acquired based on the gas composition and the concentration correction value.

2. The method of claim 1, wherein the plurality of characteristic values further comprises a temperature value, the method further comprising:

and obtaining a second evaluation result of the insulation deterioration gas according to the gas composition and the temperature value.

3. The method of claim 2, further comprising:

and generating corresponding early warning information according to the first evaluation result and the second evaluation result, and sending the early warning information to a user so that the user can overhaul according to the early warning information.

4. The method of claim 1, wherein before obtaining the plurality of characteristic values of the insulation-degrading gas in the switchgear, further comprising:

controlling a suction pump to pump insulation deterioration gas with a target volume value in the switch cabinet;

the acquiring a plurality of characteristic values of insulation deterioration gas in a switch cabinet comprises:

a plurality of characteristic values of insulation deterioration gas extracted from the switch cabinet are acquired.

5. The method of claim 4, further comprising:

and generating an air supplement instruction carrying the target volume value, wherein the air supplement instruction is used for instructing an air pump to supplement the insulation gas of which the target volume value is not degraded into the switch cabinet.

6. The method of claim 4, wherein the concentration correction formula comprises:

where ρ is_xFor corrected gas component concentration, p_maxIs the maximum value of the component concentration of the obtained insulation deterioration gas, T is the temperature value of the obtained insulation deterioration gas, RH is the humidity value of the obtained insulation deterioration gas, Pa is the pressure value of the obtained insulation deterioration gas, V₁Is the gas flow value in the air extraction process, V₂To obtain the gas flow value in the process, O^2-For the detected trace oxygen content value, alpha₁、α₂、α₃、α₄、α₅、α₆、α₇Respectively, correction coefficients.

7. An apparatus for evaluating insulation-degrading gas of a switchgear, the apparatus comprising:

the system comprises an acquisition module, a control module and a control module, wherein the acquisition module is used for acquiring a plurality of characteristic values of insulation deterioration gas in a switch cabinet;

the correction module is used for correcting the component concentration in the insulation deterioration gas according to a preset concentration correction formula and a plurality of characteristic values so as to obtain a component concentration correction value in the insulation deterioration gas;

and the evaluation module is used for acquiring a first evaluation result of the insulation deterioration gas according to the detected gas component in the insulation deterioration gas and the concentration correction value.

8. An evaluation system for insulation deterioration gas of a switchgear, comprising:

a detection device for detecting and transmitting a plurality of characteristic values of insulation deterioration gas in the switchgear, the plurality of characteristic values including at least a gas component and a component concentration;

a microprocessor connected with the detection device and used for receiving a plurality of characteristic values; correcting the component concentration in the insulation deterioration gas according to a preset concentration correction formula and a plurality of characteristic values to obtain a component concentration correction value in the insulation deterioration gas; acquiring a first evaluation result of the insulation deterioration gas according to the detected gas component in the insulation deterioration gas and the concentration correction value;

and the air pump is respectively connected with the detection device and the microprocessor and is used for pumping the insulation deterioration gas in the switch cabinet to the detection device under the control of the microprocessor.

9. The system of claim 8, wherein the detection device comprises:

the air inlet of the air guide pipe is connected with the air pump so as to receive the insulation deterioration gas to be detected, the air outlet of the air guide pipe is used for discharging the detected insulation deterioration gas, and the air guide pipe is used for forming a gas detection passage; the electrochemical sensor module is connected with the microprocessor, arranged on the gas detection passage and used for detecting a plurality of characteristic values of the insulation deterioration gas in the gas guide tube;

the first gas flow detection module is connected with the microprocessor, arranged at the gas inlet and used for detecting a first gas flow value of the insulation deterioration gas in the gas extraction process;

and the second gas flow detection module is connected with the microprocessor, arranged at the gas outlet and used for detecting a second gas flow value of the insulation deterioration gas passing through the detection device.

10. The system of claim 9, further comprising:

and the tail gas treatment device is connected with the gas outlet of the gas guide pipe and is used for carrying out synchronous tail gas treatment on the detected insulation deterioration gas.

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