CN111811894A - Gas on-line detection method and device in power transformer gas relay - Google Patents
Gas on-line detection method and device in power transformer gas relay Download PDFInfo
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- OTMSDBZUPAUEDD-UHFFFAOYSA-N Ethane Chemical compound CC OTMSDBZUPAUEDD-UHFFFAOYSA-N 0.000 claims description 10
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Abstract
The invention belongs to the technical field of on-line detection of characteristic gas of a power transformer, and particularly relates to an on-line detection method and device for gas in a gas relay of the power transformer. The detection device is characterized in that an automatic gas taking unit, a gas detection unit, an intelligent comprehensive analysis unit and a communication control unit are integrated in a metal outer cover, and all the units are connected in sequence. The invention can judge the internal state of the transformer and give a trip signal by analyzing the gas components in the gas relay at the initial stage of the transformer failure, and timely quit the failed transformer, thereby effectively preventing the accident from further expanding, and simultaneously, the invention does not need the traditional manual gas taking and operation, thereby effectively ensuring the personal safety of the working personnel.
Description
Technical Field
The invention belongs to the technical field of on-line detection of characteristic gas of a power transformer, and particularly relates to an on-line detection method and device for gas in a gas relay of the power transformer.
Background
At present, most of power transformers in China are oil-immersed transformers, and insulating oil is used as an insulating and heat-dissipating medium. The insulating oil is a mixture of hydrocarbon molecules with different molecular weights, and in actual operation, the transformer insulating oil and the solid insulating material can generate characteristic gases under the action of electricity and heat and enter a gas relay, wherein the characteristic gases comprise carbon monoxide, carbon dioxide, hydrogen, acetylene, ethane, ethylene, methane, oxygen, nitrogen and the like. Because the composition and the content of the characteristic gas have close relation with the type and the severity of equipment faults, the detection of the characteristic gas components in the gas relay is one of important means for judging whether the transformer has faults or not and judging the types of the faults.
According to the regulation requirement, after the light gas action signal of the gas relay gives an alarm, operation and maintenance personnel are required to arrive at a field for sampling, and respectively carry out a field ignition test and laboratory detection and analysis, latent faults existing in the transformer are easily further developed due to long time to cause the transformer to be damaged or even burnt, and meanwhile, personal safety hazards exist in the detection personnel during sampling.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides the method and the device for detecting the gas in the gas relay of the power transformer on line, and aims to provide the invention which has the advantages of simple structure and convenient operation, can judge the internal state of the transformer and give a trip signal by analyzing the gas components in the gas relay at the initial stage of the fault of the transformer, and can timely withdraw from the fault transformer, effectively prevent the accident from further expanding, and effectively ensure the personal safety of workers.
The technical scheme adopted by the invention for realizing the purpose is as follows:
the on-line gas detection method in the power transformer gas relay comprises the following steps:
step 1, when gas exists in a gas relay of a power transformer, an automatic gas taking unit is automatically started; the automatic gas taking unit introduces characteristic gas into the gas detection unit;
step 2, the gas detection unit performs gas component chromatographic analysis on the collected characteristic gas, converts the analysis result into an electric signal and sends the electric signal to the intelligent comprehensive analysis unit;
step 3, the intelligent comprehensive analysis unit analyzes the gas detection result, judges whether a fault exists in the power transformer or not, and stores and sends the analysis result to the communication control unit;
and 4, the communication control unit sends the analysis result to the main control room.
The intelligent comprehensive analysis unit judges whether the components of the characteristic gas need to be alarmed or not according to a preset alarm program; if the fault needs to be alarmed, the intelligent comprehensive analysis unit starts a fault alarm indicator lamp to flicker, starts a buzzer, warns operating personnel and stores an analysis result.
The intelligent comprehensive analysis unit analyzes the fault types, and the analysis method comprises a characteristic gas method and a gas content ratio method; the characteristic gas method comprises the following steps: and (4) summarizing the main characteristic gas and the secondary characteristic gas generated by different fault types, and deducing the fault type of the equipment according to the summarized result. The gas content ratio method comprises the following steps: the method is mainly a three-ratio method, and utilizes the coding combination of three-ratio values of hydrogen and hydrocarbon gas to judge the fault type on the basis of thermodynamics and practice.
The characteristic gas comprises the following components: hydrogen, methane, oxygen, nitrogen, ethane, ethylene, acetylene, carbon monoxide and carbon dioxide.
The communication control unit comprises a control panel, a storage device, a cable and a power line; the communication control unit is connected with the gas detection unit through a cable to realize signal transmission; the power supply of a 220V alternating current power supply is realized through a power line; the outer surface is provided with a control panel to realize the indication and operation of each function; the control panel comprises an indicator light and a buzzer and is used for distinguishing different judgment results; the indicator light adopts an LED form, and the buzzer is arranged on the surface of the control panel; the control panel also comprises a key for modifying the threshold values of the alarm signal and the action signal and sending out a control instruction.
The on-line gas detection device in the power transformer gas relay is characterized in that an automatic gas taking unit, a gas detection unit, an intelligent comprehensive analysis unit and a communication control unit are integrated in a metal outer cover, and all the units are sequentially connected.
The automatic gas taking unit is connected with a gas relay through a pipeline, a one-way exhaust valve K1 is arranged between the automatic gas taking unit and the gas relay, and the other end of the gas relay is connected with a transformer through a pipeline; the automatic gas taking unit is internally provided with a gas pump, and the output end of the automatic gas taking unit is connected with the input end of the gas detection unit through a pipeline; a chromatographic sensor is arranged in the gas detection unit, and the gas detection unit is connected to the input end of the intelligent analysis unit through a cable; the intelligent comprehensive analysis unit is connected to the input end of the communication control unit through a cable; the communication control unit is connected with the main control room through an optical fiber.
The automatic gas taking unit comprises a gas pump, an automatic exhaust valve, a gas inlet, a gas outlet and a controller, the gas pump is arranged at the bottom of the automatic gas taking unit, and the gas pump is automatically started after light gas is alarmed to pump characteristic gas into the automatic gas taking unit; the automatic exhaust valve is arranged on the automatic gas taking unit and is connected with the gas detection unit; the automatic air inlet valve is arranged on the automatic air taking unit and is connected with the gas relay through a metal pipe; the automatic gas taking unit is connected with the gas relay and the gas detection unit through the metal hose, and the gas detection unit is used for connecting a detection result with the intelligent comprehensive analysis unit through a cable so as to realize signal transmission; the intelligent comprehensive analysis unit is connected with the communication control unit through a cable to realize signal transmission.
The air pump is provided with an air inlet and an air outlet; the air inlet can be opened and closed automatically, still is equipped with the exhaust hole, connects gaseous detecting element through discharge valve, accomplishes gaseous ration and gathers and carry to gaseous detecting element.
A computer storage medium having a computer program stored thereon, the computer program when executed by a processor implementing the steps of the method for online detection of gas in a power transformer gas relay.
The invention has the following beneficial effects and advantages:
the invention can judge the internal state of the transformer and give a trip signal by analyzing the gas components in the gas relay at the initial stage of the transformer failure, and timely quit the failed transformer, thereby effectively preventing the accident from further expanding, and simultaneously, the invention does not need the traditional manual gas taking and operation, thereby effectively ensuring the personal safety of the working personnel.
Drawings
The invention will be described in further detail with reference to the drawings and specific embodiments for facilitating understanding and implementing the invention by those skilled in the art, but it should be understood that the scope of the invention is not limited by the drawings and the specific embodiments.
FIG. 1 is a flow chart of the detection method of the present invention;
fig. 2 is a schematic diagram of the operation of the detecting device of the present invention.
Detailed Description
The technical solution in the embodiment of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiment of the present invention. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. Other embodiments, which can be derived by one of ordinary skill in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
The invention relates to an on-line detection method for gas in a gas relay of a power transformer, which analyzes the components of the gas in the gas relay of the transformer, judges the internal fault and the fault type in a transformer chamber and provides a basis for the next processing method of the transformer. Specifically, as shown in fig. 1, fig. 1 is a flowchart of an online detection method for characteristic gas in a power transformer gas relay, which includes the following steps:
step 1, when gas exists in a gas relay of a power transformer, the device automatically starts an automatic gas taking unit; after an air pump in the automatic air taking unit is started, characteristic air in the air relay is quantitatively led into the air detection unit;
the storage device is used for storing gas component detection results and device intelligent analysis results.
Step 2, the gas detection unit performs gas component chromatographic analysis on the collected characteristic gas, converts an analysis result into an electric signal and sends the electric signal to the intelligent comprehensive analysis unit; the detection principle of the gas detection unit is gas chromatography;
the gas detection unit is provided with a gas inlet hole for connecting the automatic gas taking unit, detecting a gas sample by using a gas chromatography, converting a detection result into an electric signal and sending the electric signal to the intelligent comprehensive analysis unit through a cable.
The characteristic gas comprises the following components: hydrogen, methane, oxygen, nitrogen, ethane, ethylene, acetylene, carbon monoxide and carbon dioxide;
step 3, the intelligent comprehensive analysis unit analyzes the gas detection result, judges whether a fault exists in the power transformer or not, and sends the analysis result to the communication control unit through an electric signal and stores the analysis result;
step 4, the communication control unit sends the analysis result to a main control room, and the intelligent comprehensive analysis unit judges whether the component of the characteristic gas needs to be alarmed or not according to a preset alarm program; if the fault needs to be alarmed, the intelligent comprehensive analysis unit starts a fault alarm indicator lamp to flicker, starts a buzzer, warns operating personnel and stores an analysis result.
The communication control unit comprises a control panel, a storage device, a cable and a power line.
The communication control unit is connected with the gas detection unit through a cable to realize signal transmission; the power supply of a 220V alternating current power supply is realized through a power line; the outer surface is provided with a control panel to realize the indication and operation of each function;
the control panel comprises an indicator light and a buzzer and is used for distinguishing different judgment results.
The control panel comprises an indicator light and a buzzer and is used for distinguishing different judgment results. The indicator light adopts the LED form, and bee calling organ installs in control panel surface.
The control panel also comprises keys used for modifying the threshold values of the alarm signals and the action signals, sending control instructions and the like.
Example 2
The invention relates to an on-line gas detection device in a power transformer gas relay, which can automatically start an automatic gas taking unit when gas exists in the power transformer gas relay. As shown in fig. 2, fig. 2 is a schematic diagram of an on-line gas detection device in a power transformer gas relay according to an embodiment of the present invention.
The device of the invention is characterized in that an automatic gas taking unit, a gas detection unit, an intelligent comprehensive analysis unit and a communication control unit are integrated in a metal outer cover, and all the units are connected in sequence. One side of the device is connected with a gas relay through a metal hose, and the other side of the device is connected with an automatic gas taking unit.
The top of the automatic gas taking unit is connected with the gas relay through a metal hose, the side of the automatic gas taking unit is connected with the side of the gas detection unit, the gas detection unit is connected with the detection result through a cable and an intelligent comprehensive analysis unit to realize signal transmission, and the intelligent comprehensive analysis unit is connected with the communication control unit through a cable to realize signal transmission.
The automatic gas taking unit is connected with a gas relay through a metal pipe, a one-way exhaust valve K1 is arranged between the automatic gas taking unit and the gas relay, and the other end of the gas relay is connected with a transformer through a pipeline. The automatic gas taking unit is internally provided with a gas pump for delivering characteristic gas; the output end of the automatic gas taking unit is connected with the input end of the gas detection unit through a metal pipe, a chromatographic sensor is arranged in the gas detection unit to analyze the concentration of each characteristic gas, and a detection result is sent to the input end of the intelligent analysis unit through a cable; the analysis result of the intelligent analysis unit is sent to the input end of the communication control unit through a cable; and the communication control unit stores the analysis conclusion, remotely transmits the analysis conclusion to the master control room through the optical fiber and sends a corresponding alarm action signal.
The automatic gas taking unit comprises a gas pump, an automatic exhaust valve, a gas inlet, a gas outlet and a controller, the gas pump is arranged at the bottom of the automatic gas taking unit, and the gas pump is automatically started after light gas is alarmed to pump characteristic gas into the automatic gas taking unit; the automatic exhaust valve is arranged on the side surface of the automatic gas taking unit and is connected with the gas detection unit; the automatic air inlet valve is arranged at the top of the automatic air taking unit and is connected with the gas relay through a metal pipe.
The air pump is used for pumping the characteristic gas in the gas relay, and the characteristic gas enters the automatic gas taking unit through the gas inlet hole.
The automatic exhaust valve is used for automatically opening and closing to release redundant gas inside.
The controller is used for controlling the opening and closing states of the gas preparing valve and the gas exhausting valve.
The air inlet can be opened and closed automatically, is also provided with an exhaust valve, is connected with the gas detection unit through the exhaust valve, completes the quantitative collection of gas and conveys the gas to the gas detection unit.
When the alarm is given out, after the gas relay of the power transformer, the gas pump in the automatic gas taking unit is started, and then the characteristic gas in the gas relay is led into the gas detection unit; the controller of the gas detection unit controls the volume entering the gas detection unit and sends a signal to the automatic exhaust valve to exhaust redundant gas.
When the gas detection device is implemented specifically, the gas detection unit detects a gas sample by using a gas chromatography, the detection range comprises the component contents of hydrogen, acetylene, ethane, ethylene, methane, oxygen and nitrogen, and the detection result is sent to the intelligent comprehensive analysis unit in the form of an electric signal.
The intelligent comprehensive analysis unit analyzes the gas detection result, judges whether the transformer has internal faults or not, and sends the judgment result to the communication control unit through a cable in an electric signal mode.
The raw materials in the power transformer mainly comprise insulating oil and various paper and wood insulating parts, when the inside of the power transformer is in fault, under the action of heat and electricity, C-H bonds, C-C bonds and C-O bonds of the power transformer are broken and rapidly recombined through complex chemical reactions to form hydrogen, carbon monoxide, carbon dioxide, hydrocarbon gas and the like. After the gas enters the gas relay, the gas relay sends out light gas alarm along with the increase of the volume of the gas, and the action volume of the gas relay is 250mL-300 mL. Whether a fault exists in the transformer or not and the fault type can be judged by detecting each characteristic gas component, and the attention value of each characteristic gas is shown in table 1.
When the gas composition exceeds the noted value, the transformer is suspected of internal failure, and the transformer failure types mainly include arc discharge, oiled paper overheating, oil overheating, and the like. The intelligent comprehensive analysis unit analyzes the fault types, and the analysis method comprises a characteristic gas method and a gas content ratio method.
1. The characteristic gas method: the main characteristic gas and the secondary characteristic gas generated by different fault types can be summarized as shown in table 2, so that the fault type of the equipment can be inferred.
2. Gas content ratio method: the gas content ratio method adopted by the invention is mainly a three-ratio method, which is summarized on the basis of thermodynamics and practice and is a method for judging fault types by utilizing the coding combination of three comparison values of hydrogen and hydrocarbon gases, and is shown in tables 3 and 4.
By the aid of the method, diagnosis of the fault type of the transformer is achieved, and the communication control unit stores diagnosis results and sends the diagnosis results to the main control room through the optical fibers. If the internal fault of the transformer is judged, the internal fault is directly sent to the circuit breakers on all sides, so that the main transformer is quitted from operation. The communication control unit is provided with a control panel, and the control panel comprises an indicator light and a buzzer and is used for alarming after a fault; the control panel is also provided with keys for modifying threshold values of the alarm signals and the action signals, sending control instructions and the like.
Example 3
Based on the same inventive concept, an embodiment of the present invention further provides a computer storage medium, where a computer program is stored on the computer storage medium, and when the computer program is executed by a processor, the steps of the method for detecting gas in a power transformer gas relay in embodiment 1 or 2 are implemented.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications and equivalents may be made to the embodiments of the invention without departing from the spirit and scope of the invention, which is to be covered by the claims.
Table 1 unit of attention to the dissolved gas content in the plant in operation: mu.L/L
TABLE 2 gas generation for different fault types
| Type of failure | Gas of main character | Gas of secondary character |
| Oil superheating | CH4，C2H4 | H2，C2H6 |
| Oil and paper superheating | CH4，C2H4，CO | H2，C2H6，CO2 |
| Partial discharge in oiled paper insulation | H2，CH4，CO | C2H4，C2H6，C2H2 |
| Spark discharge in oil | H2，C2H2 | |
| Electric arc in oil | H2，C2H2，C2H4 | CH4,C2H6 |
| Electric arc in oil and paper | H2，C2H2，C2H4，CO | CH4,C2H6，CO |
TABLE 3 coding rules by three-ratio method
TABLE 4 Fault type determination method
Claims (10)
1. The on-line detection method for the gas in the power transformer gas relay is characterized by comprising the following steps: the method comprises the following steps:
step 1, when gas exists in a gas relay of a power transformer, an automatic gas taking unit is automatically started; the automatic gas taking unit introduces characteristic gas into the gas detection unit;
step 2, the gas detection unit performs gas component chromatographic analysis on the collected characteristic gas, converts the analysis result into an electric signal and sends the electric signal to the intelligent comprehensive analysis unit;
step 3, the intelligent comprehensive analysis unit analyzes the gas detection result, judges whether a fault exists in the power transformer or not, and stores and sends the analysis result to the communication control unit;
and 4, the communication control unit sends the analysis result to the main control room.
2. The method for on-line detection of gas in a power transformer gas relay as claimed in claim 1, wherein: the intelligent comprehensive analysis unit judges whether the components of the characteristic gas need to be alarmed or not according to a preset alarm program; if the fault needs to be alarmed, the intelligent comprehensive analysis unit starts a fault alarm indicator lamp to flicker, starts a buzzer, warns operating personnel and stores an analysis result.
3. The method for on-line detection of gas in a power transformer gas relay as claimed in claim 1, wherein: the intelligent comprehensive analysis unit analyzes the fault types, and the analysis method comprises a characteristic gas method and a gas content ratio method;
the characteristic gas method comprises the following steps: summarizing main characteristic gas and secondary characteristic gas generated by different fault types, and deducing the fault type of the equipment according to the summarization result; the gas content ratio method comprises the following steps: the method is mainly a three-ratio method, and utilizes the coding combination of three-ratio values of hydrogen and hydrocarbon gas to judge the fault type on the basis of thermodynamics and practice.
4. The method for on-line detection of gas in a power transformer gas relay as claimed in claim 1, wherein: the characteristic gas comprises the following components: hydrogen, methane, oxygen, nitrogen, ethane, ethylene, acetylene, carbon monoxide and carbon dioxide.
5. The method for on-line detection of gas in a power transformer gas relay as claimed in claim 1, wherein: the communication control unit comprises a control panel, a storage device, a cable and a power line;
the communication control unit is connected with the gas detection unit through a cable to realize signal transmission; the power supply of a 220V alternating current power supply is realized through a power line; the outer surface is provided with a control panel to realize the indication and operation of each function;
the control panel comprises an indicator light and a buzzer and is used for distinguishing different judgment results; the indicator light adopts an LED form, and the buzzer is arranged on the surface of the control panel;
the control panel also comprises a key for modifying the threshold values of the alarm signal and the action signal and sending out a control instruction.
6. Gas on-line measuring device among power transformer gas relay, characterized by: an automatic gas taking unit, a gas detection unit, an intelligent comprehensive analysis unit and a communication control unit are integrated in the metal outer cover, and all the units are connected in sequence.
7. The on-line gas detection device in the power transformer gas relay as claimed in claim 6, wherein: the automatic gas taking unit is connected with a gas relay through a pipeline, a one-way exhaust valve K1 is arranged between the automatic gas taking unit and the gas relay, and the other end of the gas relay is connected with a transformer through a pipeline; the automatic gas taking unit is internally provided with a gas pump, and the output end of the automatic gas taking unit is connected with the input end of the gas detection unit through a pipeline; a chromatographic sensor is arranged in the gas detection unit, and the gas detection unit is connected to the input end of the intelligent analysis unit through a cable; the intelligent comprehensive analysis unit is connected to the input end of the communication control unit through a cable; the communication control unit is connected with the main control room through an optical fiber.
8. The on-line gas detection device in the power transformer gas relay as claimed in claim 6, wherein: the automatic gas taking unit comprises a gas pump, an automatic exhaust valve, a gas inlet, a gas outlet and a controller, the gas pump is arranged at the bottom of the automatic gas taking unit, and the gas pump is automatically started after light gas is alarmed to pump characteristic gas into the automatic gas taking unit; the automatic exhaust valve is arranged on the automatic gas taking unit and is connected with the gas detection unit; the automatic air inlet valve is arranged on the automatic air taking unit and is connected with the gas relay through a metal pipe; the automatic gas taking unit is connected with the gas relay and the gas detection unit through the metal hose, and the gas detection unit is used for connecting a detection result with the intelligent comprehensive analysis unit through a cable so as to realize signal transmission; the intelligent comprehensive analysis unit is connected with the communication control unit through a cable to realize signal transmission.
9. The on-line gas detection device in the power transformer gas relay as claimed in claim 8, wherein: the air pump is provided with an air inlet and an air outlet; the air inlet can be opened and closed automatically, and is connected with the gas detection unit through the exhaust valve, so that the quantitative collection of gas is completed, and the gas is conveyed to the gas detection unit.
10. A computer storage medium, characterized by: the computer storage medium has stored thereon a computer program which, when being executed by a processor, carries out the steps of the method for online detection of gas in a power transformer gas relay as claimed in claims 1-9.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010666364.9A CN111811894A (en) | 2020-07-11 | 2020-07-11 | Gas on-line detection method and device in power transformer gas relay |
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| CN202010666364.9A CN111811894A (en) | 2020-07-11 | 2020-07-11 | Gas on-line detection method and device in power transformer gas relay |
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| CN202010666364.9A Pending CN111811894A (en) | 2020-07-11 | 2020-07-11 | Gas on-line detection method and device in power transformer gas relay |
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| CN112465010A (en) * | 2020-11-25 | 2021-03-09 | 云南大学 | DKPCA and KFDA-based transformer fault detection and classification method |
| CN112557621A (en) * | 2020-11-12 | 2021-03-26 | 中国电力科学研究院有限公司 | Gas composition monitoring and alarming device |
| CN113341346A (en) * | 2021-05-31 | 2021-09-03 | 国网宁夏电力有限公司电力科学研究院 | Comprehensive detection system and method for gas on oil surface of oil paper insulation power transformer |
| CN114137050A (en) * | 2021-11-19 | 2022-03-04 | 国网山东省电力公司电力科学研究院 | Gas composition online monitoring device and method suitable for transformer |
| CN114530826A (en) * | 2021-12-28 | 2022-05-24 | 国电南瑞科技股份有限公司 | Transformer light gas protection method and system based on organic gas concentration characteristics |
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