CN112414949A - Gas relay for detecting transformer fault in real time and diagnosis method - Google Patents
Gas relay for detecting transformer fault in real time and diagnosis method Download PDFInfo
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Abstract
A gas relay for detecting transformer faults in real time and a diagnosis method thereof are provided, wherein the gas relay comprises: the gas relay comprises a gas relay body, an oil inlet, an oil outlet, a first gas pipe, a bottle to be detected, a gas relay deflation valve and a collecting and sending unit, wherein a fault gas detection module connected with the collecting and sending unit is arranged in the bottle to be detected and used for detecting whether the bottle to be detected contains hydrocarbon gas, the concentration and the color of the hydrocarbon gas and whether the bottle to be detected contains pungent odor gas; if the pressure sensor detects that the gas pressure in the gas relay body reaches a threshold value K1, the gas inlet electromagnetic valve is controlled to be opened, and the gas in the gas relay body enters the bottle to be inspected through the gas inlet electromagnetic valve and the oil filter screen. Compared with the prior art, the method comprehensively evaluates the severity of the transformer fault, wins precious time for the operation and maintenance of the transformer, and avoids the traditional operation personnel from going to a transformer substation to take gas and returning the gas to a laboratory for detection.
Description
Technical Field
The invention belongs to the technical field of power equipment quality detection, and particularly relates to a gas relay for detecting transformer faults in real time and a diagnosis method.
Background
The gas relay mainly plays an inside basic protective action of power transformer, and gas relay's application shows that, when the transformer takes place insulating nature and decomposes fast or the transformer body takes place to discharge the nature trouble, gas relay often reflects the fault degree fast to in time the disconnected power, effectively reduce the loss that the transformer trouble brought, avoid transformer accident to enlarge. However, the transformer enters air, the temperature drops and other reasons, and the gas relay malfunctions (part of the reasons are that air enters the gas relay) often to cause an alarm or trip, and actually, the transformer does not have a fault, so that the reliable operation of the transformer is seriously influenced.
The gas relay sends out an alarm signal after gathering certain gas, generally, an operator goes to a transformer station to carry out transformer oil test and gas detection so as to further diagnose whether the transformer is fault gas or air, the transformer is powered off in the traditional method, the operator is arranged to take gas from the transformer gas relay and send the gas to a laboratory for detection, 1-2 days are usually needed from the time when the gas relay gathers the gas to a diagnosis result, the working efficiency is extremely low, once the transformer has sudden serious fault, the transformer cannot take measures according to the diagnosis result, the transformer is seriously damaged or even burnt, and serious accidents are caused. In addition, the operation personnel take gas on site under the condition that the transformer is electrified, so that a large safety risk exists, once the transformer breaks down suddenly, the personal safety of the operation personnel can be seriously threatened, and the inestimable result is caused.
In the prior patent technology description, most of the prior patent technology description is only limited to the improvement of the gas relay, and the judgment on whether the transformer is fault gas or not and the severity of the fault cannot be carried out effectively. Representative patents include a transformer fault gas collecting device and method (CN201811304616.2), which identify whether a fault gas is detected by an ignition method, the method has poor effectiveness and real-time performance, some fault gas components are not necessarily combustible, the on-site operation risk is extremely high, the working efficiency is low, and the fault condition cannot be judged in time.
Disclosure of Invention
The invention aims to solve the problem that accidents such as alarm caused by misoperation of a transformer gas relay due to other interference, damage and even burning of the transformer caused by untimely gas detection and poor effectiveness of a single detection means in the prior art are expanded, and improve the safe operation reliability of the transformer, and the invention aims to provide the gas relay for detecting and diagnosing the transformer faults in real time and a method for identifying and judging the transformer faults, quickly detect whether the gas accumulated in the gas relay is gas generated by faults or gas generated by non-fault reasons, comprehensively judge the severity of the faults of the transformer by detecting the smell, components and colors of the gas, quickly send diagnosis information to transformer operators through a cloud platform after detection, diagnose the operation state of the transformer without developing serious faults of the transformer, and win the processing time for the overhaul and maintenance of the transformer operators, the damage of the transformer caused by untimely treatment is prevented.
The invention adopts the following technical scheme. A gas relay for real-time detection of transformer faults, comprising: the gas relay comprises a gas relay body, an oil inlet, an oil outlet, a first gas pipe, a bottle to be detected, a gas relay deflation valve and a collecting and sending unit, wherein one end of the bottle to be detected is connected with the gas relay body through the first gas pipe, and the other end of the bottle to be detected is connected with a gas relay deflation plug through a second gas pipe; a fault gas detection module connected with the acquisition and sending unit is arranged in the bottle to be detected and used for detecting whether the bottle to be detected contains hydrocarbon gas, the concentration and the gas color of the hydrocarbon gas and whether the bottle to be detected contains pungent odor gas; an oil filter screen is arranged at one end of the first air pipe close to the bottle to be detected, a pressure sensor is arranged at one end of the first air pipe close to the gas relay body, and an air inlet electromagnetic valve is arranged between the oil filter screen and the pressure sensor and is connected with the collecting and sending unit; if the pressure sensor detects that the gas pressure in the gas relay body reaches a threshold value K1, the gas inlet electromagnetic valve is controlled to be opened, and the gas in the gas relay body enters the bottle to be inspected through the gas inlet electromagnetic valve and the oil filter screen; the collecting and sending unit is arranged above the gas relay body, is connected with the fault gas detection module, and is used for generating a transformer fault grade evaluation result and sending alarm information to the background.
Preferably, the threshold K1 is set to 0.1-2kpa, and further preferably, the intake solenoid valve is controlled to close if the pressure sensor detects that the gas pressure inside the gas relay body is reduced below the threshold K1 after the intake solenoid valve is opened.
Preferably, the fault gas detection module includes: the hydrocarbon detection sensor, the color change sensor and the electronic nose sensor which are arranged on the inner side face of the bottle to be detected are connected with the acquisition and sending unit.
Preferably, set up exhaust solenoid valve waiting to examine the inside upside of bottle for the control waits to examine the gaseous emission in bottle inside, and be connected with collection and sending unit, wait to examine bottle inside trouble gaseous detection module and accomplish after detecting, open the inside gaseous of exhaust control solenoid valve release and wait to examine bottle, further preferably, exhaust control solenoid valve is provided with the check valve, and the outside air of control can't get into and waits to examine the bottle, only will wait to examine the gaseous emission of bottle inside, exhaust control solenoid valve self-closing.
Preferably, the outer part of the acquisition and transmission unit adopts a semi-closed spherical metal shell structure, the edge of the shell is more than 1cm away from the lowest end of the signal acquisition and transmission unit, and further preferably, the distance is set to be 1-5cm for shielding the interference of surrounding charged bodies and preventing rain.
The invention also provides a diagnosis method of the gas relay for detecting the transformer fault in real time, which comprises the following steps:
and 5, after the detection of each sensor in the bottle to be detected is finished, opening the exhaust control electromagnetic valve to release the gas in the bottle to be detected, and controlling the exhaust control electromagnetic valve to automatically close when the internal and external relative pressure of the bottle to be detected is zero.
Preferably, in step 2, the result of detecting the hydrocarbon gas, which is represented by the first characteristic value Pq, is expressed by the following formula,
in the formula:
pq is a value that represents the first characteristic value,
CCHrepresents the hydrocarbon gas concentration;
preferably, the second characteristic value Ps represents the gas color detection result, and is expressed by the following formula,
in the formula:
ps represents the second characteristic value;
preferably, the third characteristic value Pd represents the detection result of the pungent odor gas, and is expressed by the following formula,
in the formula:
pd represents a third feature value.
Preferably, step 3, the transformer fault is diagnosed by comprehensive analysis using the first characteristic value Pq, the second characteristic value Ps and the third characteristic value Pd generated in step 2, and is expressed by the following formula,
in the formula:
p represents a transformer fault diagnosis evaluation coefficient,
pq is a value that represents the first characteristic value,
ps represents the second characteristic value of the first characteristic value,
pd represents a third feature value.
Preferably, in step 3, the transformer fault diagnosis evaluation coefficient P is used to judge the transformer fault, which is expressed by the following formula,
in the formula:
and P represents a transformer fault diagnosis evaluation coefficient.
Preferably, in step 4, if the fault level evaluation result is any one of a general fault, a serious fault or a critical fault, the analysis result is immediately accessed to the transformer operation or management user APP, and early warning is performed in time; the user APP can access and display the diagnosis data and the analysis result of the transformer in real time.
Compared with the prior art, the gas relay has the advantages that when the gas pressure is increased to K1 due to the fact that the gas relay gathers gas, a small amount of gas (less than 100mL) can enter a bottle to be detected by setting the size of K1, and a traditional gas relay alarms when reaching 300mL of gas, so that the gas relay has higher sensitivity compared with the prior art. The gas comprehensively diagnosed and detected by the hydrocarbon detection sensor, the electronic nose sensor and the color change sensor is the characteristic gas or air generated by transformer faults, the detection result is rapidly sent to the transformer operation or management personnel through the cloud server after detection, the severity of the transformer faults is accurately evaluated, the invaluable time is won for the operation and maintenance of the transformer, and the traditional operation personnel are removed from the transformer substation to take the gas and return the gas to the laboratory for detection.
The invention comprehensively detects and diagnoses the components, color and smell of the gas, and has the advantages of rapid detection, accurate diagnosis and strong effectiveness. After detection, the result is sent to the cloud in real time and is calculated and analyzed, so that the working efficiency is greatly improved, the safe operation level of the transformer is improved, and the safety of operators is ensured.
Drawings
FIG. 1 is a schematic diagram of a gas relay for real-time detection of transformer faults according to the present invention;
FIG. 2 is a schematic diagram of a gas relay detection unit for detecting transformer faults in real time according to the present invention;
FIG. 3 is a schematic view of the acquisition and transmission unit housing of the present invention;
fig. 4 is a flow chart of the signal acquisition and transmission unit of the present invention.
In the figure:
1-a gas relay body;
2-an observation window;
3-an oil inlet;
4-an oil outlet;
5-a first air pipe;
6-a bottle to be detected;
7-air relief plug;
8-a collection and transmission unit;
9-a probe;
10-hydrocarbon sensors;
11-a colour change sensor;
12-an electronic nose sensor;
13-oil filter screen;
14-an air inlet control solenoid valve;
15-a pressure sensor;
16-exhaust control solenoid valve;
17-acquisition and transmission unit housing.
Detailed Description
The present application is further described below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present application is not limited thereby.
The first embodiment: gas relay for detecting transformer fault in real time
As shown in fig. 1, the present invention provides a gas relay for detecting a fault of a transformer in real time, including: gas relay body 1, observation window 2, oil inlet 3, oil-out 4, first trachea 5, examine bottle 6, gas relay gassing stopper 7, collection and sending unit 8 and probe 9 of examining.
Wait to examine bottle 6 and be transparent container for collect the gas of the inside release of gas relay body 1, wait to examine 6 one end of bottle and be connected with gas relay body 1 through first trachea 5, the other end is connected with gas relay gassing stopper 7 through the second trachea.
As shown in fig. 2, a fault gas detection module connected to the collecting and transmitting unit 8 is disposed in the bottle 6 to be detected, and is used for detecting whether the bottle 6 to be detected contains hydrocarbon gas, the concentration and the color of the hydrocarbon gas, and whether the bottle 6 to be detected contains pungent odor gas. It is understood that a person skilled in the art may arbitrarily configure the sensors used in the fault gas detection module and the installation positions thereof according to actual situations, and the sensors may be a plurality of sensors with single functions or a plurality of sensors with multiple functions integrated.
To clearly illustrate the implementation of the present invention, a preferred but non-limiting configuration is described in a first embodiment of the present invention, wherein the fault gas detection module comprises: a hydrocarbon detection sensor 10, a color change sensor 11, and an electronic nose sensor 12.
The hydrocarbon detection sensor 10 is arranged at the upper side inside the bottle 6 to be detected, is connected with the acquisition and sending unit 8 and is used for detecting whether the bottle 6 to be detected contains hydrocarbon gas and the concentration C of the hydrocarbon gasCH. The first characteristic value Pq represents the detection result of the hydrocarbon gas and is expressed by the following formula,
in the formula:
pq is a value that represents the first characteristic value,
CCHrepresenting the hydrocarbon gas concentration.
The color change sensor 11 is arranged on the inner side surface of the bottle 6 to be detected, is connected with the collecting and sending unit 8 and is used for detecting the color of the gas in the bottle 6 to be detected. The second characteristic value Ps represents the gas color detection result, and is expressed by the following formula,
in the formula:
ps represents the second characteristic value.
The electronic nose sensor 12 is disposed on the inner side of the bottle 6 to be inspected, and is connected to the collecting and transmitting unit 8 for detecting whether the bottle 6 to be inspected contains pungent odor gas. The third characteristic value Pd is used for representing the detection result of the pungent odor gas and is expressed by the following formula,
in the formula:
pd represents a third feature value.
The oil filter screen 13 is arranged at one end of the first air pipe 5 close to the bottle 6 to be detected, and the pressure sensor 15 is arranged at one end of the first air pipe 5 close to the gas relay body 1 and is connected with the collecting and sending unit 8. An inlet solenoid valve 14 is arranged between the oil screen 13 and the pressure sensor 15 and is connected to the acquisition and transmission unit 8.
If the pressure sensor 15 detects that the gas pressure in the gas relay body 1 reaches a threshold value K1, the gas inlet electromagnetic valve 14 is controlled to be opened, and the gas in the gas relay body 1 enters the bottle 6 to be detected through the gas inlet electromagnetic valve 14 and the oil filter screen 13; after that, when the pressure sensor 15 detects that the gas pressure inside the gas relay body 1 has dropped below the threshold value K1, the intake solenoid valve 14 is controlled to close. It will be appreciated that the threshold K1 can be set arbitrarily by those skilled in the art, depending on the actual field, and a preferred but non-limiting embodiment is to set the threshold K1 to 0.1-2kpa depending on the different sensitivity requirements.
Compared with the prior art, when the transformer gas relay gathers gas and the gas pressure is increased to the threshold value K1, a small amount of gas can enter the bottle to be checked by setting the threshold value K1, and a preferable but non-limiting embodiment is that less than 100mL of gas enters the bottle to be checked by setting the threshold value, and compared with the traditional gas relay which alarms when reaching 300mL of gas, the gas relay has higher sensitivity.
The collecting and sending unit 8 is arranged above the gas relay body 1, is connected with the fault gas detection module and is used for sending transformer fault information to transformer operators in time. It can be understood that each sensor and valve works under the control of the collecting and sending unit 8, collects data, and sends fault information to the user through the collecting and sending unit 8 after analyzing and calculating the data. Those skilled in the art can implement the data processing and controlling functions of the collecting and sending unit 8 in any way, including but not limited to a data processing and controlling module based on a single chip, and the like. As shown in figure 3, the external part of the acquisition and transmission unit 8 adopts a semi-closed ball metal shell outer cover 17 structure, the edge A, B of the outer cover is more than 1cm away from the lowest end of the signal acquisition and transmission unit, and the distance is set to be 1-5cm, so that the influence of surrounding charged bodies can be shielded, acquisition signals can be transmitted to the outside, and the function of long-term rain prevention is achieved.
It is understood that the positions of the sensors and valves of the first embodiment of the present invention, which are disposed on or in the bottle 6 to be inspected, can be arbitrarily set by those skilled in the art according to the actual field, and the sensors and valves are uniformly distributed on the surface of the bottle 6 to be inspected, and disposed on the upper side, the side or the lower side of the interior of the bottle 6 to be inspected, without affecting the functions thereof and ensuring good sealing.
Second embodiment: diagnosis method for detecting transformer fault in real time
As shown in fig. 4, a second embodiment of the present invention provides a diagnosis method of a gas relay using the above real-time detection of a transformer fault, including the steps of:
in the formula:
pq is a value that represents the first characteristic value,
CCHrepresents the hydrocarbon gas concentration;
the color change sensor 11 detects the color of the gas in the bottle 6 to be inspected, generates a detection result representing the color of the gas by the second characteristic value Ps, and is expressed by the following formula,
in the formula:
ps represents the second characteristic value;
the electronic nose sensor 12 detects whether the bottle 6 to be inspected contains the pungent odor gas, generates a detection result of the pungent odor gas represented by the third characteristic value Pd, and is expressed by the following formula,
in the formula:
pd represents a third feature value.
in the formula:
p represents a transformer fault diagnosis evaluation coefficient,
pq is a value that represents the first characteristic value,
ps represents the second characteristic value of the first characteristic value,
pd represents a third eigenvalue;
and the transformer fault diagnosis evaluation coefficient P is used for judging the transformer fault, and is expressed by the following formula,
in the formula:
p represents a transformer fault diagnosis evaluation coefficient;
no fault indicates that the gas in the gas relay body 1 is air, the transformer can be safely operated in a live mode, and emergency power failure is needed when the fault level is critical.
It is to be understood that the assignment of the first characteristic value Pq, the second characteristic value Ps, and the third characteristic value Pd used in the present embodiment, and the power exponent used to calculate the failure diagnosis evaluation coefficient are all preferable but not restrictive options. For example, a person skilled in the art may assign scores or decimal values, or values with larger or smaller values to the first feature value Pq, the second feature value Ps, and the third feature value Pd, or obtain a failure diagnosis evaluation coefficient using other power exponents for the first feature value Pq, the second feature value Ps, and the third feature value Pd, and further subdivide the failure evaluation level section. The preferred values given in the present invention are only for clearly describing the technical solution and advantageous effects of the present invention, and do not mean that the present invention must be implemented with these parameters.
Compared with the prior art, the gas comprehensively diagnosed and detected by the hydrocarbon detection sensor, the electronic nose sensor and the color change sensor is the characteristic gas or air generated by the transformer fault, the detection result is rapidly sent to the transformer operation or management personnel through the cloud server after detection, the severity of the transformer fault is evaluated, the invaluable time is won for the operation and maintenance of the transformer, and the traditional operation personnel are removed from the transformer substation to take the gas and return the gas to the laboratory for detection.
And 4, the acquisition and sending unit 8 sends the fault level evaluation result to the cloud server-less server, and if the fault level evaluation result is any one of a general fault, a serious fault or a critical fault, the analysis result is immediately accessed to the transformer operation or management user APP, and early warning is timely carried out. The user APP can access and display the diagnosis data and the analysis result of the transformer in real time.
And 5, after the detection of each sensor in the bottle 6 to be detected is finished, opening the exhaust control electromagnetic valve 16 to release the gas in the bottle 6 to be detected, and automatically closing the exhaust control electromagnetic valve 16 when the relative pressure inside and outside the bottle 6 to be detected is reduced to 0.
Compared with the prior art, the gas relay has the advantages that when the gas pressure is increased to K1 due to the fact that the gas relay gathers gas, a small amount of gas (less than 100mL) can enter a bottle to be detected by setting the size of K1, and a traditional gas relay alarms when reaching 300mL of gas, so that the gas relay has higher sensitivity compared with the prior art. The gas comprehensively diagnosed and detected by the hydrocarbon detection sensor, the electronic nose sensor and the color change sensor is the characteristic gas or air generated by transformer faults, the detection result is quickly sent to transformer operation or management personnel through the cloud server after detection, the severity of the transformer faults is evaluated, precious time is saved for transformer operation and maintenance, and the traditional operation personnel are saved from going to a transformer substation to take gas and return to a laboratory for detection.
Example 1, a gas relay of a certain transformer collects gas to cause the gas relay to send out an alarm signal, and whether the gas or air is caused by internal faults of the transformer cannot be judged on site at the first time. By utilizing the technology of the invention, the hydrocarbon sensor detects the hydrocarbon gas to be 16.5ppm, and the Pq characteristic value is 2. The electronic nose sensor detects pungent odor, and the characteristic value of Pd is 2. The color change sensor detects that the gas color is yellow, the characteristic value Ps is 2, and the P is 17.8 through comprehensive detection and diagnosis, critical faults exist in the transformer, and the transformer substation operation personnel are prompted to need to perform power failure for emergency treatment in time. And then the power is cut off in time, severe discharge traces are detected in the transformer, and further damage and accident enlargement of the transformer are avoided by cutting off the power in time and taking effective measures.
The invention comprehensively detects and diagnoses the components, color and smell of the gas, and has high accuracy and strong effectiveness. After detection, the result is sent to the cloud in real time and is calculated and analyzed, so that the working efficiency is greatly improved, the safe operation level of the transformer is improved, and the safety of operators is ensured.
The present applicant has described and illustrated embodiments of the present invention in detail with reference to the accompanying drawings, but it should be understood by those skilled in the art that the above embodiments are merely preferred embodiments of the present invention, and the detailed description is only for the purpose of helping the reader to better understand the spirit of the present invention, and not for limiting the scope of the present invention, and on the contrary, any improvement or modification made based on the spirit of the present invention should fall within the scope of the present invention.
Claims (10)
1. A gas relay for real-time detection of transformer faults, comprising: gas relay body (1), oil inlet (3), oil-out (4), first trachea (5), examine and examine bottle (6), gas relay gassing stopper (7) and gather and send unit (8), its characterized in that:
one end of a bottle (6) to be detected is connected with the gas relay body (1) through a first gas pipe (5), and the other end of the bottle is connected with a gas relay vent plug (7) through a second gas pipe; a fault gas detection module connected with the acquisition and sending unit (8) is arranged in the bottle (6) to be detected and is used for detecting whether the bottle (6) to be detected contains hydrocarbon gas, the concentration and the color of the hydrocarbon gas and whether the bottle (6) to be detected contains irritant odor gas;
an oil filter screen (13) is arranged at one end of the first air pipe (5) close to the bottle (6) to be detected, a pressure sensor (15) is arranged at one end of the first air pipe (5) close to the gas relay body (1), and an air inlet electromagnetic valve (14) is arranged between the oil filter screen (13) and the pressure sensor (15) and is connected with the acquisition and sending unit (8);
if the pressure sensor (15) detects that the gas pressure in the gas relay body (1) reaches a threshold value K1, the gas inlet electromagnetic valve (14) is controlled to be opened, and the gas in the gas relay body (1) enters the bottle (6) to be detected through the gas inlet electromagnetic valve (14) and the oil filter screen (13);
the collecting and sending unit (8) is arranged above the gas relay body (1), is connected with the fault gas detection module, and is used for generating a transformer fault grade evaluation result and sending alarm information to a background.
2. The gas relay for real-time detection of transformer faults according to claim 1, characterized in that:
the threshold K1 is set to be 0.1-2kpa, and further preferably, after the air inlet solenoid valve (14) is opened, if the pressure sensor (15) detects that the air pressure in the gas relay body (1) is reduced below the threshold K1, the air inlet solenoid valve (14) is controlled to be closed.
3. The gas relay for real-time detection of transformer faults according to claim 1 or 2, characterized in that:
the fault gas detection module includes: the hydrocarbon detection sensor (10) on the upper side inside the bottle (6) to be detected, the color change sensor (11) arranged on the side inside the bottle (6) to be detected and the electronic nose sensor (12) are connected with the acquisition and sending unit (8).
4. A gas relay for real-time detection of transformer faults according to any of claims 1 to 3, characterized in that:
set up exhaust solenoid valve (16) waiting to examine the inside upside of bottle (6), be used for the control to wait to examine the gaseous emission in bottle (6), and be connected with collection and sending unit (8), wait to examine bottle (6) inside trouble gas detection module and accomplish after detecting, open exhaust control solenoid valve (16) release and wait to examine bottle (6) inside gas, further preferably, exhaust control solenoid valve (16) are provided with the check valve, the outside air of control can't get into and wait to examine the bottle, only wait to examine the gaseous emission of bottle inside, exhaust control solenoid valve (16) self-closing.
5. The gas relay for real-time detection of transformer faults according to any one of claims 1 to 4, characterized in that:
the outer part of the acquisition and sending unit (8) adopts a semi-closed spherical metal shell cover (17) structure, the edge of the cover is more than 1cm away from the lowest end of the signal acquisition and sending unit (8), and further preferably, the distance is set to be 1-5cm for shielding the interference of surrounding charged bodies and preventing rain.
6. A diagnosis method of a gas relay for detecting a transformer fault in real time using any one of claims 1 to 5, comprising the steps of:
step 1, after gas aggregation occurs inside a transformer, if a pressure sensor (15) detects that the gas pressure inside a gas relay body (1) reaches a threshold value K1, an air inlet electromagnetic valve (14) is controlled to be opened, and the gas inside the gas relay body (1) enters a bottle (6) to be detected; then, if the pressure sensor (15) detects that the gas pressure in the gas relay body (1) is reduced to be below a threshold value K1, the air inlet electromagnetic valve (14) is controlled to be closed;
step 2, detecting whether the bottle (6) to be detected contains hydrocarbon gas and the concentration C thereof by a fault gas detection module in the bottle (6) to be detectedCHGenerating a hydrocarbon gas detection result represented by a first characteristic value Pq, a gas color detection result represented by a second characteristic value Ps, and an pungent odor gas detection result represented by a third characteristic value Pd;
step 3, multiplying the first characteristic value Pq, the second characteristic value Ps and the third characteristic value Pd generated in the step 2 as base numbers after power operation to obtain a transformer fault diagnosis evaluation coefficient P, and dividing the transformer fault grade by the transformer fault diagnosis evaluation coefficient P;
step 4, the acquisition and sending unit (8) sends the fault level evaluation result to a cloud server, sends an analysis result to a transformer operation or management user APP, and carries out real-time early warning;
and 5, after the detection of each sensor in the bottle to be detected (6) is finished, opening the exhaust control electromagnetic valve (16) to release the gas in the bottle to be detected (6), and controlling the exhaust control electromagnetic valve (16) to be automatically closed when the internal and external relative pressure of the bottle to be detected (6) is zero.
7. The diagnostic method for detecting the fault of the transformer in real time according to claim 6, wherein:
in step 2, the result of detecting the hydrocarbon gas represented by the first characteristic value Pq is expressed by the following formula,
in the formula:
pq is a value that represents the first characteristic value,
CCHrepresents the hydrocarbon gas concentration;
preferably, the second characteristic value Ps represents the gas color detection result, and is expressed by the following formula,
in the formula:
ps represents the second characteristic value;
preferably, the third characteristic value Pd represents the detection result of the pungent odor gas, and is expressed by the following formula,
in the formula:
pd represents a third feature value.
8. The diagnostic method for detecting the fault of the transformer in real time according to claim 6 or 7, wherein:
step 3, comprehensively analyzing and diagnosing the transformer fault by using the first characteristic value Pq, the second characteristic value Ps and the third characteristic value Pd generated in the step 2, and expressing the transformer fault by using the following formula,
in the formula:
p represents a transformer fault diagnosis evaluation coefficient,
pq is a value that represents the first characteristic value,
ps represents the second characteristic value of the first characteristic value,
pd represents a third feature value.
9. The diagnostic method for detecting the fault of the transformer in real time according to any one of claims 6 to 8, wherein:
in step 3, the transformer fault diagnosis evaluation coefficient P is used for judging the transformer fault and is expressed by the following formula,
in the formula:
and P represents a transformer fault diagnosis evaluation coefficient.
10. The diagnostic method for detecting a fault of a transformer in real time according to any one of claims 6 to 9, wherein:
in step 4, if the fault grade evaluation result is any one of a general fault, a serious fault or a critical fault, the analysis result is immediately accessed to the transformer operation or management user APP, and early warning is carried out in time; the user APP can access and display the diagnosis data and the analysis result of the transformer in real time.
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| CN114220638A (en) * | 2021-11-23 | 2022-03-22 | 国网山西省电力公司电力科学研究院 | High-voltage wire outlet device for extra-high voltage transformer and reactor and fault diagnosis method thereof |
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| CN115563528A (en) * | 2022-11-25 | 2023-01-03 | 四川飞宇电力股份有限公司 | Transformer maintenance equipment control method, electronic equipment and medium |
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