CN114530826A - Transformer light gas protection method and system based on organic gas concentration characteristics - Google Patents
Transformer light gas protection method and system based on organic gas concentration characteristics Download PDFInfo
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- CN114530826A CN114530826A CN202111627221.8A CN202111627221A CN114530826A CN 114530826 A CN114530826 A CN 114530826A CN 202111627221 A CN202111627221 A CN 202111627221A CN 114530826 A CN114530826 A CN 114530826A
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- 238000000034 method Methods 0.000 title claims abstract description 30
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 166
- HSFWRNGVRCDJHI-UHFFFAOYSA-N alpha-acetylene Natural products C#C HSFWRNGVRCDJHI-UHFFFAOYSA-N 0.000 claims abstract description 91
- 125000002534 ethynyl group Chemical group [H]C#C* 0.000 claims abstract description 91
- OTMSDBZUPAUEDD-UHFFFAOYSA-N Ethane Chemical compound CC OTMSDBZUPAUEDD-UHFFFAOYSA-N 0.000 claims abstract description 83
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 claims abstract description 82
- 239000005977 Ethylene Substances 0.000 claims abstract description 82
- 230000008859 change Effects 0.000 claims description 12
- 230000015654 memory Effects 0.000 claims description 8
- 230000004044 response Effects 0.000 claims description 6
- 238000004364 calculation method Methods 0.000 claims description 3
- 230000035945 sensitivity Effects 0.000 abstract description 5
- 239000007789 gas Substances 0.000 description 115
- 238000010586 diagram Methods 0.000 description 8
- 238000004590 computer program Methods 0.000 description 7
- 230000003111 delayed effect Effects 0.000 description 6
- 238000011161 development Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 230000006870 function Effects 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000012545 processing Methods 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 239000007788 liquid Substances 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/04—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for transformers
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/0004—Gaseous mixtures, e.g. polluted air
- G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
- G01N33/0027—General constructional details of gas analysers, e.g. portable test equipment concerning the detector
- G01N33/0036—Specially adapted to detect a particular component
- G01N33/0047—Specially adapted to detect a particular component for organic compounds
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/0004—Gaseous mixtures, e.g. polluted air
- G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
- G01N33/0062—General constructional details of gas analysers, e.g. portable test equipment concerning the measuring method, e.g. intermittent, or the display, e.g. digital
- G01N33/0063—General constructional details of gas analysers, e.g. portable test equipment concerning the measuring method, e.g. intermittent, or the display, e.g. digital using a threshold to release an alarm or displaying means
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H5/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection
Abstract
The invention discloses a method and a system for protecting light gas of a transformer based on the concentration characteristics of organic gas, wherein the method and the system effectively identify the condition of false protection alarm caused by external gas inlet of the transformer by utilizing the characteristics that the external gas inlet does not contain the organic gas and the fault gas in the transformer contains the organic gas, so as to avoid false protection operation; meanwhile, the light gas protection tripping signal is judged based on the average methane concentration, the average ethane concentration, the average ethylene concentration and the average acetylene concentration within the past preset time T, compared with the traditional gas volume criterion, fault information can be sensitively sensed before the gas volume reaches the original rated threshold, and the protection reliability, the speed and the sensitivity are improved.
Description
Technical Field
The invention relates to a method and a system for protecting light gas of a transformer based on organic gas concentration characteristics, and belongs to the technical field of protection of oil-immersed transformers.
Background
The transformer light gas protection is mainly applied to early detection of internal faults of the transformer, and compared with transformer electric quantity protection, non-electric quantity protection generated by reaction fault gas can identify fault development characteristics in a slight fault stage, so that the running state of a protected object is reflected more sensitively, directly and comprehensively.
The existing light gas protection utilizes the principle that the internal fault of an oil-immersed transformer generates heat to vaporize insulating oil, and judges whether the volume of gas reaches a threshold value or not through a mechanical structure. The method can easily cause protection misoperation under the condition of external air inlet, and the light gas protection sensitivity is low due to single criterion.
Disclosure of Invention
The invention provides a transformer light gas protection method and system based on organic gas concentration characteristics, and solves the problems that protection misoperation is easily caused and the sensitivity is low in the existing method.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
the transformer light gas protection method based on the organic gas concentration characteristics comprises the following steps:
in response to the fact that the volume change rate of the gas in the gas collection box is larger than a rate threshold value, taking the current moment as a cut-off moment of a preset time length T, and calculating the average concentration of methane, the average concentration of ethane, the average concentration of ethylene and the average concentration of acetylene in the past preset time length T;
and judging a light gas protection trip signal according to the average concentration of methane, the average concentration of ethane, the average concentration of ethylene and the average concentration of acetylene.
According to the average concentration of methane, the average concentration of ethane, the average concentration of ethylene and the average concentration of acetylene, the light gas protection trip signal judgment comprises the following steps:
judging a light gas protection throwing delay trip signal according to the average concentration of methane, the average concentration of ethane, the average concentration of ethylene and the average concentration of acetylene;
and judging the instantaneous trip signal of the light gas protection switching according to the average concentration of acetylene.
According to the average concentration of methane, the average concentration of ethane, the average concentration of ethylene and the average concentration of acetylene, the judgment of the delayed trip signal of light gas protection is carried out, and comprises the following steps:
under the condition that the average concentration of acetylene is less than the threshold value of acetylene concentration, if the average concentration of methane is more than or equal to the threshold value of methane concentration, the average concentration of ethane is more than or equal to the threshold value of ethane concentration or the average concentration of ethylene is more than or equal to the threshold value of ethylene concentration, the light gas protection is thrown with a preset delay A trip signal;
under the condition that the average concentration of acetylene is less than the threshold value of acetylene concentration, if the average concentration of methane is greater than or equal to the threshold value of methane concentration and the average concentration of ethane is greater than or equal to the threshold value of ethane concentration, the average concentration of ethane is greater than or equal to the threshold value of ethane concentration and the average concentration of ethylene is greater than or equal to the threshold value of ethylene concentration, or the average concentration of ethylene is greater than or equal to the threshold value of ethylene concentration and the average concentration of methane is greater than or equal to the threshold value of methane concentration, the light gas protection is thrown with a preset delay B trip signal;
under the condition that the average concentration of acetylene is less than the threshold value of acetylene concentration, if the average concentration of methane is greater than or equal to the threshold value of methane concentration, the average concentration of ethane is greater than or equal to the threshold value of ethane concentration, and the average concentration of ethylene is greater than or equal to the threshold value of ethylene concentration, the light gas protection is thrown with a preset time delay C trip signal; wherein A > B > C.
According to the average concentration of acetylene, the judgment of the light gas protection throwing instantaneous trip signal comprises the following steps:
and if the average concentration of the acetylene is greater than or equal to the acetylene concentration threshold value, switching an instantaneous trip signal for light gas protection.
Light gas protection system of transformer based on organic gas concentration characteristic includes:
a calculation module: in response to the fact that the volume change rate of the gas in the gas collection box is larger than a rate threshold value, taking the current moment as a cut-off moment of a preset time length T, and calculating the average concentration of methane, the average concentration of ethane, the average concentration of ethylene and the average concentration of acetylene in the past preset time length T;
a judging module: and judging a light gas protection trip signal according to the average concentration of methane, the average concentration of ethane, the average concentration of ethylene and the average concentration of acetylene.
The judging module comprises:
and (3) judging the delay: judging a light gas protection throwing delay trip signal according to the average concentration of methane, the average concentration of ethane, the average concentration of ethylene and the average concentration of acetylene;
and (3) judging the throwing instant: and judging the instantaneous trip signal of the light gas protection switching according to the average concentration of acetylene.
The delay time judgment comprises the following steps:
and (3) delay A trip judgment: under the condition that the average concentration of acetylene is less than the threshold value of acetylene concentration, if the average concentration of methane is more than or equal to the threshold value of methane concentration, the average concentration of ethane is more than or equal to the threshold value of ethane concentration or the average concentration of ethylene is more than or equal to the threshold value of ethylene concentration, the light gas protection is thrown with a preset delay A trip signal;
and B, delay B trip judgment: under the condition that the average concentration of acetylene is less than the threshold value of acetylene concentration, if the average concentration of methane is greater than or equal to the threshold value of methane concentration and the average concentration of ethane is greater than or equal to the threshold value of ethane concentration, the average concentration of ethane is greater than or equal to the threshold value of ethane concentration and the average concentration of ethylene is greater than or equal to the threshold value of ethylene concentration, or the average concentration of ethylene is greater than or equal to the threshold value of ethylene concentration and the average concentration of methane is greater than or equal to the threshold value of methane concentration, the light gas protection is thrown with a preset delay B trip signal;
and C, delay C trip judgment: under the condition that the average concentration of acetylene is less than the threshold value of acetylene concentration, if the average concentration of methane is greater than or equal to the threshold value of methane concentration, the average concentration of ethane is greater than or equal to the threshold value of ethane concentration, and the average concentration of ethylene is greater than or equal to the threshold value of ethylene concentration, the light gas protection is thrown with a preset time delay C trip signal; wherein A > B > C.
The judgment of the throwing moment comprises the following steps:
and (3) judging instantaneous trip: and if the average concentration of the acetylene is greater than or equal to the acetylene concentration threshold value, switching an instantaneous trip signal for light gas protection.
A computer readable storage medium storing one or more programs, the one or more programs comprising instructions, which when executed by a computing device, cause the computing device to perform a transformer light gas protection method based on organic gas concentration characteristics.
A computing device comprising one or more processors, one or more memories, and one or more programs stored in the one or more memories and configured to be executed by the one or more processors, the one or more programs including instructions for performing a method of transformer light gas protection based on an organic gas concentration signature.
The invention achieves the following beneficial effects: according to the invention, by utilizing the characteristics that the external inlet air does not contain organic gas and the fault gas generation inside the transformer contains organic gas, the condition of false protection alarm caused by the external inlet air of the transformer is effectively identified, and the false protection operation is avoided; meanwhile, the light gas protection tripping signal is judged based on the average methane concentration, the average ethane concentration, the average ethylene concentration and the average acetylene concentration within the past preset time T, compared with the traditional gas volume criterion, fault information can be sensitively sensed before the gas volume reaches the original rated threshold, and the protection reliability, the speed and the sensitivity are improved.
Drawings
FIG. 1 is a flow chart of the method of the present invention;
FIG. 2 is a schematic view of the installation of an embodiment;
fig. 3 is a conventional radial grid.
Detailed Description
The invention 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 invention is not limited thereby.
As shown in fig. 1, the method for protecting light gas of a transformer based on the concentration characteristics of organic gas comprises the following steps:
step 1, in response to the fact that the volume change rate of gas in a gas collection box is larger than a rate threshold value, taking the current moment as the cut-off moment of a preset time length T, and calculating the average concentration of methane, the average concentration of ethane, the average concentration of ethylene and the average concentration of acetylene in the past preset time length T;
and 2, judging a light gas protection trip signal according to the average concentration of methane, the average concentration of ethane, the average concentration of ethylene and the average concentration of acetylene.
The method is directly applied to the light gas relay, and effectively identifies the condition of protecting false alarm caused by external air inlet of the transformer by utilizing the characteristic that the external air inlet does not contain organic gas and the fault gas generated in the transformer contains organic gas, thereby avoiding the protection false operation; meanwhile, the light gas protection tripping signal is judged based on the average methane concentration, the average ethane concentration, the average ethylene concentration and the average acetylene concentration within the past preset time T, compared with the traditional gas volume criterion, fault information can be sensitively sensed before the gas volume reaches the original rated threshold, and the protection reliability, the speed and the sensitivity are improved.
As shown in fig. 2, the light gas relay can collect the gas volume in the gas collection box through the magnetostrictive liquid level meter, calculate the gas volume change rate, start the light gas protection when the gas volume change rate is greater than the rate threshold, and generally set the rate threshold to 20ml/h according to the gas production rule of the internal defect of the transformer.
In the development process of short circuit faults inside the transformer, the proportional relation of four organic gases, namely methane, ethane, ethylene and acetylene, in the total gas production quantity changes along with the temperature, wherein the temperature of the gas production position increases along with the aggravation of the severity of the faults. Therefore, the concentration of methane, ethane, ethylene and acetylene is mainly measured.
When the gas volume change rate is detected to be larger than a rate threshold value, taking the current moment as a cut-off moment of a preset duration T; the current time is the time when the gas volume change rate is detected to be greater than the rate threshold, and the preset time length T is determined according to the actual situation and is generally 5 seconds.
Based on the concentrations of methane, ethane, ethylene and acetylene measured in real time, the average concentration of methane, the average concentration of ethane, the average concentration of ethylene and the average concentration of acetylene in the preset time period T can be calculated by adopting the following formulas:
wherein, PavgThe average concentration of the gas in the past preset time period T, N is the number of measurements in the past preset time period T, PiThe gas concentration obtained for the ith measurement.
Judging a light gas protection switching tripping signal according to the calculated average concentration, wherein the light gas protection switching tripping signal comprises a light gas protection switching delayed tripping signal and a light gas protection switching instantaneous tripping signal; the average concentration of methane, the average concentration of ethane, the average concentration of ethylene and the average concentration of acetylene can be used for judging tripping signals in a time delay manner, and fault characteristic gas is converted into acetylene from ethane, methane and ethylene along with the rise of fault temperature/power, so that the average concentration of acetylene can be used for judging instantaneous tripping signals.
According to the average concentration of methane, the average concentration of ethane, the average concentration of ethylene and the average concentration of acetylene, the light gas protection switching delay trip signal judgment is carried out, and the process generally comprises the following steps:
11) under the condition that the average concentration of acetylene is less than the threshold value of acetylene concentration, if the average concentration of methane is more than or equal to the threshold value of methane concentration, the average concentration of ethane is more than or equal to the threshold value of ethane concentration or the average concentration of ethylene is more than or equal to the threshold value of ethylene concentration, the light gas protection is thrown with a preset delay A trip signal; and setting the preset delay A as the delay of half an hour based on the fault development experience rule.
The above criterion can be expressed by the following formula:
F＝{A and(not B)and(not C)and(not D)}
or{(not A)and B and(not C)and(not D)}
or{(not A)and(not B)and C and(not D)}
wherein, F represents a trip signal of light gas protection delayed for half an hour;
criterion A:
wherein the content of the first and second substances,
in order to average the concentration of methane in the gas collecting box within the past preset time length T,
is a methane concentration threshold;
criterion B:
wherein the content of the first and second substances,
in order to average the concentration of ethane in the gas collection box within the past preset time period T,
is an ethane concentration threshold;
criterion C:
wherein the content of the first and second substances,
in order to average the concentration of ethylene in the gas collection box within the past preset time period T,
is an ethylene concentration threshold;
criterion D:
wherein the content of the first and second substances,
in order to average the concentration of acetylene in the gas collecting box within the past preset time T,
is the acetylene concentration threshold.
12) Under the condition that the average concentration of acetylene is less than the threshold value of acetylene concentration, if the average concentration of methane is greater than or equal to the threshold value of methane concentration and the average concentration of ethane is greater than or equal to the threshold value of ethane concentration, the average concentration of ethane is greater than or equal to the threshold value of ethane concentration and the average concentration of ethylene is greater than or equal to the threshold value of ethylene concentration, or the average concentration of ethylene is greater than or equal to the threshold value of ethylene concentration and the average concentration of methane is greater than or equal to the threshold value of methane concentration, the light gas protection is thrown with a preset delay B trip signal; and setting the preset delay B as a delay of ten minutes based on the fault development experience rule.
The above criterion can be expressed by the following formula:
F1＝{A and B and(not C)and(not D)}
or{(not A)and B and C and(not D)}
or{A and(not B)and C and(not D)}
wherein, F1 represents the light gas protection throwing delay ten minutes trip signal.
13) Under the condition that the average concentration of acetylene is less than the threshold value of acetylene concentration, if the average concentration of methane is greater than or equal to the threshold value of methane concentration, the average concentration of ethane is greater than or equal to the threshold value of ethane concentration, and the average concentration of ethylene is greater than or equal to the threshold value of ethylene concentration, the light gas protection is thrown with a preset time delay C trip signal; and setting the preset delay C as five minutes of delay based on the fault development experience rule.
The above criterion can be expressed by the following formula:
F2＝{A and B and C and(not D)}
wherein, F2 represents the light gas protection throwing delay five-minute trip signal.
According to the average concentration of acetylene, the instantaneous trip signal judgment of light gas protection is carried out, and the process generally comprises the following steps:
21) and if the average concentration of the acetylene is greater than or equal to the acetylene concentration threshold value, switching an instantaneous trip signal for light gas protection.
The above criterion can be expressed by the following formula:
F3＝D
wherein, F3 represents the instantaneous trip signal of light gas protection.
FIG. 3 is a conventional radial grid including an oil-immersed transformer T1And T2The radial power grid is externally connected with a lower-level line and a load, and an oil-immersed transformer T is arranged in the figure1For example, a magnetostrictive liquid level meter is adopted to collect the volume of gas in a gas collection box, the change rate of the volume of the gas is calculated, when the change rate of the volume of the gas is greater than a rate threshold value, light gas protection is started, and based on the concentrations of methane, ethane, ethylene and acetylene measured in real time, the average concentration of methane and the average concentration of ethane in a preset time period T can be calculatedAnd determining the light gas protection switching delayed half-hour trip signal, the light gas protection switching delayed ten-minute trip signal, the light gas protection switching delayed five-minute trip signal or the light gas protection switching instantaneous trip signal according to the judgment process.
Based on the same inventive concept, the embodiment of the present application further provides a transformer light gas protection system based on organic gas concentration characteristics, which is a software system of the above method, and includes:
a calculation module: and in response to the fact that the volume change rate of the gas in the gas collection box is larger than a rate threshold value, taking the current moment as the cut-off moment of the preset time length T, and calculating the average concentration of methane, the average concentration of ethane, the average concentration of ethylene and the average concentration of acetylene in the past preset time length T.
A judging module: and judging a light gas protection trip signal according to the average concentration of methane, the average concentration of ethane, the average concentration of ethylene and the average concentration of acetylene.
The judging module comprises:
and (3) judging the delay: judging a light gas protection throwing delay trip signal according to the average concentration of methane, the average concentration of ethane, the average concentration of ethylene and the average concentration of acetylene;
the delay time judgment comprises the following steps:
and (3) delay A trip judgment: under the condition that the average concentration of acetylene is less than the threshold value of acetylene concentration, if the average concentration of methane is more than or equal to the threshold value of methane concentration, the average concentration of ethane is more than or equal to the threshold value of ethane concentration or the average concentration of ethylene is more than or equal to the threshold value of ethylene concentration, the light gas protection is thrown with a preset delay A trip signal;
and B, delay B trip judgment: under the condition that the average concentration of acetylene is less than the threshold value of acetylene concentration, if the average concentration of methane is greater than or equal to the threshold value of methane concentration and the average concentration of ethane is greater than or equal to the threshold value of ethane concentration, the average concentration of ethane is greater than or equal to the threshold value of ethane concentration and the average concentration of ethylene is greater than or equal to the threshold value of ethylene concentration, or the average concentration of ethylene is greater than or equal to the threshold value of ethylene concentration and the average concentration of methane is greater than or equal to the threshold value of methane concentration, the light gas protection is thrown with a preset delay B trip signal;
and C, delay C trip judgment: under the condition that the average concentration of acetylene is less than the threshold value of acetylene concentration, if the average concentration of methane is greater than or equal to the threshold value of methane concentration, the average concentration of ethane is greater than or equal to the threshold value of ethane concentration, and the average concentration of ethylene is greater than or equal to the threshold value of ethylene concentration, the light gas protection is thrown with a preset time delay C trip signal; wherein A > B > C.
And (3) judging the switching instant: judging an instantaneous trip signal of light gas protection switching according to the average concentration of acetylene;
the judgment of the throwing moment comprises the following steps:
and (3) judging instantaneous trip: and if the average concentration of the acetylene is greater than or equal to the acetylene concentration threshold value, switching an instantaneous trip signal for light gas protection.
Based on the same inventive concept, embodiments of the present application also provide a computer-readable storage medium storing one or more programs, the one or more programs comprising instructions, which when executed by a computing device, cause the computing device to perform a transformer light gas protection method based on an organic gas concentration characteristic.
Based on the same inventive concept, embodiments of the present application also provide a computing device comprising one or more processors, one or more memories, and one or more programs, wherein the one or more programs are stored in the one or more memories and configured to be executed by the one or more processors, and the one or more programs comprise instructions for executing the method for light gas protection of a transformer based on organic gas concentration characteristics.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention 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 invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. 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.
The present invention is not limited to the above embodiments, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention are included in the scope of the claims of the present invention which are filed as the application.
Claims (10)
1. The transformer light gas protection method based on the organic gas concentration characteristics is characterized by comprising the following steps:
in response to the fact that the volume change rate of the gas in the gas collection box is larger than a rate threshold value, taking the current moment as a cut-off moment of a preset time length T, and calculating the average concentration of methane, the average concentration of ethane, the average concentration of ethylene and the average concentration of acetylene in the past preset time length T;
and judging a light gas protection trip signal according to the average concentration of methane, the average concentration of ethane, the average concentration of ethylene and the average concentration of acetylene.
2. The transformer light gas protection method based on organic gas concentration characteristics according to claim 1, wherein the light gas protection tripping signal judgment is performed according to the average methane concentration, the average ethane concentration, the average ethylene concentration and the average acetylene concentration, and comprises the following steps:
judging a light gas protection throwing delay trip signal according to the average concentration of methane, the average concentration of ethane, the average concentration of ethylene and the average concentration of acetylene;
and judging the instantaneous trip signal of the light gas protection switching according to the average concentration of acetylene.
3. The transformer light gas protection method based on organic gas concentration characteristics according to claim 2, wherein the light gas protection time-delay trip signal judgment is carried out according to the average methane concentration, the average ethane concentration, the average ethylene concentration and the average acetylene concentration, and comprises the following steps:
under the condition that the average concentration of acetylene is less than the threshold value of acetylene concentration, if the average concentration of methane is more than or equal to the threshold value of methane concentration, the average concentration of ethane is more than or equal to the threshold value of ethane concentration or the average concentration of ethylene is more than or equal to the threshold value of ethylene concentration, the light gas protection is thrown with a preset delay A trip signal;
under the condition that the average concentration of acetylene is less than the threshold value of acetylene concentration, if the average concentration of methane is greater than or equal to the threshold value of methane concentration and the average concentration of ethane is greater than or equal to the threshold value of ethane concentration, the average concentration of ethane is greater than or equal to the threshold value of ethane concentration and the average concentration of ethylene is greater than or equal to the threshold value of ethylene concentration, or the average concentration of ethylene is greater than or equal to the threshold value of ethylene concentration and the average concentration of methane is greater than or equal to the threshold value of methane concentration, the light gas protection is thrown with a preset delay B trip signal;
under the condition that the average concentration of acetylene is less than the threshold value of acetylene concentration, if the average concentration of methane is greater than or equal to the threshold value of methane concentration, the average concentration of ethane is greater than or equal to the threshold value of ethane concentration, and the average concentration of ethylene is greater than or equal to the threshold value of ethylene concentration, the light gas protection is thrown with a preset time delay C trip signal; wherein A > B > C.
4. The transformer light gas protection method based on organic gas concentration characteristics according to claim 2, wherein the light gas protection switching instantaneous trip signal judgment is carried out according to the average concentration of acetylene, and comprises the following steps:
and if the average concentration of the acetylene is greater than or equal to the acetylene concentration threshold value, switching an instantaneous trip signal for light gas protection.
5. Light gas protection system of transformer based on organic gas concentration characteristic, its characterized in that includes:
a calculation module: in response to the fact that the volume change rate of the gas in the gas collection box is larger than a rate threshold value, taking the current moment as a cut-off moment of a preset time length T, and calculating the average concentration of methane, the average concentration of ethane, the average concentration of ethylene and the average concentration of acetylene in the past preset time length T;
a judging module: and judging a light gas protection trip signal according to the average concentration of methane, the average concentration of ethane, the average concentration of ethylene and the average concentration of acetylene.
6. The transformer light gas protection system based on organic gas concentration characteristics according to claim 5, wherein the judgment module comprises:
and (3) judging the delay: judging a light gas protection throwing delay trip signal according to the average concentration of methane, the average concentration of ethane, the average concentration of ethylene and the average concentration of acetylene;
and (3) judging the throwing instant: and judging the instantaneous trip signal of the light gas protection switching according to the average concentration of acetylene.
7. The transformer light gas protection system based on organic gas concentration characteristics according to claim 6, wherein the delay time judgment comprises:
and (3) delay A trip judgment: under the condition that the average concentration of acetylene is less than the threshold value of acetylene concentration, if the average concentration of methane is more than or equal to the threshold value of methane concentration, the average concentration of ethane is more than or equal to the threshold value of ethane concentration or the average concentration of ethylene is more than or equal to the threshold value of ethylene concentration, the light gas protection is thrown with a preset delay A trip signal;
and B, delay B trip judgment: under the condition that the average concentration of acetylene is less than the threshold value of acetylene concentration, if the average concentration of methane is greater than or equal to the threshold value of methane concentration and the average concentration of ethane is greater than or equal to the threshold value of ethane concentration, the average concentration of ethane is greater than or equal to the threshold value of ethane concentration and the average concentration of ethylene is greater than or equal to the threshold value of ethylene concentration, or the average concentration of ethylene is greater than or equal to the threshold value of ethylene concentration and the average concentration of methane is greater than or equal to the threshold value of methane concentration, the light gas protection is thrown with a preset delay B trip signal;
and C, delay C trip judgment: under the condition that the average concentration of acetylene is less than the threshold value of acetylene concentration, if the average concentration of methane is greater than or equal to the threshold value of methane concentration, the average concentration of ethane is greater than or equal to the threshold value of ethane concentration, and the average concentration of ethylene is greater than or equal to the threshold value of ethylene concentration, the light gas protection is thrown with a preset time delay C trip signal; wherein A > B > C.
8. The transformer light gas protection system based on organic gas concentration characteristics according to claim 6, wherein the switching instant judgment comprises:
and (3) judging instantaneous trip: and if the average concentration of the acetylene is greater than or equal to the acetylene concentration threshold value, switching an instantaneous trip signal for light gas protection.
9. A computer readable storage medium storing one or more programs, characterized in that: the one or more programs include instructions that, when executed by a computing device, cause the computing device to perform any of the methods of claims 1-4.
10. A computing device, comprising:
one or more processors, one or more memories, and one or more programs stored in the one or more memories and configured to be executed by the one or more processors, the one or more programs including instructions for performing any of the methods of claims 1-4.
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