CN111999355A - Transformer combustible gas online detection device and method - Google Patents
Transformer combustible gas online detection device and method Download PDFInfo
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- CN111999355A CN111999355A CN202010999306.8A CN202010999306A CN111999355A CN 111999355 A CN111999355 A CN 111999355A CN 202010999306 A CN202010999306 A CN 202010999306A CN 111999355 A CN111999355 A CN 111999355A
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- 238000001514 detection method Methods 0.000 title claims abstract description 32
- 238000000034 method Methods 0.000 title claims abstract description 10
- 238000004519 manufacturing process Methods 0.000 claims abstract description 41
- 238000004868 gas analysis Methods 0.000 claims abstract description 25
- 239000007789 gas Substances 0.000 claims description 186
- 238000004891 communication Methods 0.000 claims description 19
- 238000004458 analytical method Methods 0.000 claims description 17
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 12
- 238000007084 catalytic combustion reaction Methods 0.000 claims description 9
- 239000001257 hydrogen Substances 0.000 claims description 8
- 229910052739 hydrogen Inorganic materials 0.000 claims description 8
- 239000002184 metal Substances 0.000 claims description 7
- HSFWRNGVRCDJHI-UHFFFAOYSA-N alpha-acetylene Natural products C#C HSFWRNGVRCDJHI-UHFFFAOYSA-N 0.000 claims description 6
- 125000002534 ethynyl group Chemical group [H]C#C* 0.000 claims description 6
- 239000007788 liquid Substances 0.000 claims description 6
- OTMSDBZUPAUEDD-UHFFFAOYSA-N Ethane Chemical compound CC OTMSDBZUPAUEDD-UHFFFAOYSA-N 0.000 claims description 4
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 claims description 4
- 239000005977 Ethylene Substances 0.000 claims description 4
- 239000013307 optical fiber Substances 0.000 claims description 4
- 230000005518 electrochemistry Effects 0.000 claims description 2
- 238000005259 measurement Methods 0.000 claims description 2
- 238000000926 separation method Methods 0.000 claims description 2
- 125000004435 hydrogen atom Chemical class [H]* 0.000 claims 2
- 231100000572 poisoning Toxicity 0.000 abstract 1
- 230000000607 poisoning effect Effects 0.000 abstract 1
- 150000002431 hydrogen Chemical class 0.000 description 5
- 238000012423 maintenance Methods 0.000 description 3
- 238000012806 monitoring device Methods 0.000 description 3
- 239000004215 Carbon black (E152) Substances 0.000 description 2
- 238000002848 electrochemical method Methods 0.000 description 2
- 238000004880 explosion Methods 0.000 description 2
- 229930195733 hydrocarbon Natural products 0.000 description 2
- 150000002430 hydrocarbons Chemical class 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000004587 chromatography analysis Methods 0.000 description 1
- 238000003745 diagnosis Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/26—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrochemical variables; by using electrolysis or electrophoresis
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N31/00—Investigating or analysing non-biological materials by the use of the chemical methods specified in the subgroup; Apparatus specially adapted for such methods
- G01N31/12—Investigating or analysing non-biological materials by the use of the chemical methods specified in the subgroup; Apparatus specially adapted for such methods using combustion
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- Pathology (AREA)
- Physics & Mathematics (AREA)
- Analytical Chemistry (AREA)
- Immunology (AREA)
- General Health & Medical Sciences (AREA)
- Molecular Biology (AREA)
- Combustion & Propulsion (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Housings And Mounting Of Transformers (AREA)
- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
- Gas-Insulated Switchgears (AREA)
Abstract
A transformer combustible gas online detection device and a method relate to the field of power transformer characteristic gas online detection. At the moment, gas in the gas relay is led into the gas analysis unit through the gas production unit, the gas production unit is internally provided with an oil level gauge for preventing transformer oil from entering the gas analysis unit so as to avoid poisoning of the gas sensor, the gas analysis unit is internally provided with a gas sensor for detecting the flammability of the led gas, and the detection result is stored and whether a tripping signal is sent or not is judged. The invention can judge whether the transformer has internal faults or not and give corresponding signals through the flammability of the gas at the initial stage of the transformer fault, thereby preventing the accident from further expanding, simultaneously, the traditional manual gas taking and operation are not needed, and the personal safety is ensured.
Description
Technical Field
The invention relates to the field of online detection of characteristic gas of a power transformer, in particular to an online detection device and method for combustible gas of a transformer.
Background
The volume action of the gas relay is that a certain amount of gas is gathered, the gas has combustible and non-combustible components, when the gathered gas contains combustible gas, the internal fault of the transformer can be possibly, and whether the explosion and the like are possible can be judged through the analysis of the combustible gas.
In recent years, fire and explosion caused by faults of multiple oil-immersed transformers occur in the power industry, great threat is brought to safety of human bodies, equipment and power grids, and adverse social influence is caused. The characteristic gas generated in the transformer failure causes light gas to send out an alarm signal, but at present, no means for monitoring the components of the characteristic gas in real time exists, and the characteristic gas refers to a gas mixture of gases to be detected, such as hydrogen, methane, acetylene and the like. The traditional oil chromatography off-line detection method has the problems of long detection time, difficult maintenance cost, high maintenance cost and the like.
Disclosure of Invention
In order to solve the problems, the invention provides a transformer combustible gas online detection device and a transformer combustible gas online detection method, which solve the problem of monitoring the components of characteristic gas in real time.
The technical scheme of the invention is as follows: a transformer combustible gas on-line detection device comprises a gas production unit 21, a gas analysis unit 14, a control communication unit 15 and a display screen 19; an oil level sensor 22 is arranged in the automatic gas production unit 21, the bottom of the automatic gas production unit 21 is connected with a third electromagnetic valve 24 through a first metal pipe 23, the third electromagnetic valve 24 is connected with a liquid accumulation oil tank 26 through a second metal pipe 25, the left side of the upper part of the automatic gas production unit 21 is connected with the gas relay 1 through a gas guide pipe, a first electromagnetic valve 3 is arranged between a first gas guide pipe 2 and a second gas guide pipe 4, the right side of the upper part of the gas production unit is provided with a gas outlet 6 and is connected with one end of a gas analysis unit 14 through a third gas guide pipe 7, a second electromagnetic valve 8 and a third gas guide pipe 9; the other end of the gas analysis unit 14 is connected with the exhaust electromagnetic valve 13, the gas analysis unit 14 and the automatic gas production unit 21 are connected with the control unit 15 through electric wires, signals in the sensor in the gas analysis unit 14 are sent to the control unit 15, and the control unit 15 is provided with a display screen 19 which displays the signals through the display screen.
The control panel comprises an indicator light and a buzzer 17 and is used for prompting operation and maintenance personnel;
the storage device is used for storing gas analysis results;
the cable is used for receiving and transmitting electric signals;
the device also comprises a metal outer cover which is used for integrating the gas production unit 21, the control panel 19, the cable, the power line and the storage device.
A method of a transformer combustible gas online detection device comprises the following steps:
when the characteristic gas volume is larger than the alarm volume (250-300 mL) of the gas relay, the gas relay alarms, when the gas relay gives an alarm, the control communication unit receives an alarm signal, the oil discharge electromagnetic valve 24 of the gas production unit 21 is automatically opened, the internal insulating oil flows out to the accumulated liquid oil tank 25, under the action of pressure, the gas in the gas relay enters the gas production unit 21 through the first gas guide pipe 2, the first electromagnetic valve 3 and the second gas guide pipe 4, the oil level sensor 22 in the gas production unit closes the oil discharge electromagnetic valve 24, opens the second electromagnetic valve 8 and the exhaust electromagnetic valve 13 after reaching a set value, the characteristic gas enters the gas analysis unit 15 from the gas production unit 21, and the control communication unit 15 judges whether the gas is combustible gas or not and the concentration of the characteristic gas after receiving the signal of the gas sensor in the gas analysis unit 14 and sends the result;
the control communication unit 15 is used for receiving an alarm signal of the gas relay 1, receiving a signal of the oil level sensor 22, controlling the opening and closing of the electromagnetic valve 3, the oil discharge electromagnetic valve 24, the electromagnetic valve 8 and the exhaust electromagnetic valve 13 and sending an analysis result of the gas sensor;
when the gas relay gives an alarm, the oil discharge electromagnetic valve 24 is automatically opened and discharges the internal insulating oil, and when the set value is reached, the oil discharge electromagnetic valve 24 is automatically closed; after the oil discharge electromagnetic valve 24 is closed, the exhaust electromagnetic valve 13 is automatically opened;
after the electromagnetic valve 8 and the exhaust electromagnetic valve 13 are started, the characteristic gas is guided to the gas analysis unit 14 from the gas production unit 21; the characteristic gas is a gas mixture of gases to be detected, such as hydrogen, methane, and acetylene.
The gas analysis unit 14 is internally provided with an infrared sensor 1, an electrochemical gas sensor 10 and a catalytic combustion sensor 11 and is used for analyzing the concentration value of characteristic gas;
the oil level sensor 22 is installed inside the gas production unit 21 and used for detecting volume change of insulating oil inside the gas production unit 21;
the gas sensor comprises an electrochemical sensor 10, a catalytic combustion sensor 11 and an infrared sensor 12, and is used for judging whether internal gas is combustible gas such as hydrogen, methane, ethane, ethylene, acetylene and the like;
the invention has the beneficial technical effects that: the transformer combustible gas monitoring device can judge whether the transformer has internal faults or not through the gas flammability at the initial stage of the transformer fault, and prevent the further expansion of the fault.
Drawings
FIG. 1 is a flow chart of the combustible gas on-line detection method of the invention.
FIG. 2 is a schematic structural diagram of the detecting device of the present invention.
Detailed Description
The technical scheme of the embodiment of the invention will be clear and clear in the following by combining the attached drawings of the invention,
Having described the invention in full, it is to be understood that the embodiments described are merely illustrative of some, but not all, embodiments of the invention
Examples are given. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The on-line detection method and the combustible gas monitoring device for the transformer combustible gas in the embodiment of the invention judge the combustibility of the gas in the transformer gas relay, confirm whether the transformer has internal faults or not and provide a basis for the next processing method of the transformer.
The present invention will be described in detail with reference to fig. 1 and 2.
A flow chart of a transformer combustible gas online detection method is disclosed, wherein the steps of the method shown in the flow chart comprise:
step 1, after an alarm is given by a gas relay 1, a first electromagnetic valve 3 and an oil discharge electromagnetic valve 25 of a gas production unit are automatically opened, insulating oil in the gas production unit 21 flows out to an accumulated liquid oil tank 26 under the pressure action of a transformer conservator, and gas in the gas relay enters the automatic gas production unit 21 through a first gas guide pipe 2, the first electromagnetic valve 3 and a second gas guide pipe 4;
step 2, after the oil level sensor 22 in the automatic gas production unit 21 reaches a set value, the oil discharge electromagnetic valve 25 is automatically closed, the second electromagnetic valve 8 and the exhaust electromagnetic valve 13 are automatically opened, and gas enters the gas analysis unit 14 from the gas production unit 21;
step 3, an electrochemical gas sensor 10, a catalytic combustion sensor 11 and an infrared sensor 12 in the gas analysis unit analyze concentration values of various characteristic gas components in the characteristic gas, generate corresponding electric signals and send the electric signals to a communication control unit 14;
and 4, the communication control unit 14 sends the analysis result to the display screen 19, and sends the analysis result to the main control room through the 485 communication cable 20 or light, if the concentration of the combustible gas in the gas is judged to reach or exceed a set value, a trip signal is sent, meanwhile, the fault indicator lamp and the buzzer 17 are started to warn operators, and the analysis result is sent to the main control room.
The automatic gas production unit 21 is connected with the gas relay 1 through a metal gas guide pipe 2, an oil level sensor 22 is arranged in the automatic gas production unit 21, an electromagnetic oil discharge valve 24 is arranged at the bottom, and an electromagnetic oil discharge valve 24 is arranged below the gas inlet 5 at the upper part; the automatic gas production unit 21 is connected with the gas detection unit 14 through the gas guide tube 7, the electromagnetic valve 8 and the gas guide tube 9, the gas detection unit 14 is internally provided with an electrochemical sensor gas sensor 10, a catalytic combustion sensor 11 and an infrared sensor 12, the communication control unit 14 analyzes the characteristic gas concentration to judge whether the characteristic gas concentration is combustible gas, the Tencent control unit 14 stores the analysis conclusion, remotely transmits the analysis conclusion to a master control through a 485 communication cable 20 or an optical fiber and sends a corresponding alarm action signal; at the same time, the display screen 19 will display the analysis data and conclusions.
When the characteristic gas volume is larger than the alarm volume (250 + 300 mL) of the gas relay, the gas relay 1 gives an alarm, and after the gas relay 1 gives an alarm, the first electromagnetic valve 3 and the oil discharge electromagnetic valve 25 of the gas production unit are automatically opened, the insulating oil in the gas production unit 21 flows out to the accumulated liquid oil tank 26 under the pressure action of the transformer conservator, and the characteristic gas in the gas relay enters the automatic gas production unit 21 through the first gas guide pipe 2, the first electromagnetic valve 3 and the second gas guide pipe 4; after the oil level sensor 22 in the automatic gas production unit 21 reaches a set value, the set value of the oil level sensor is 100ml, the oil level sensor has an oil-gas separation function, oil and gas are separated, the oil discharge electromagnetic valve 25 is automatically closed, the second electromagnetic valve 8 and the exhaust electromagnetic valve 13 are automatically opened, and a part of characteristic gas enters the gas analysis unit 14 from the gas production unit 21; the gas detection unit 14 is internally provided with an electrochemical sensor gas sensor 10, a catalytic combustion sensor 11 and an infrared sensor 12, and analyzes the concentration of characteristic gas and the concentration of combustible gas by adopting methods of electrochemistry, catalytic combustion and infrared sensor measurement. The electrochemical method is characterized in that the electrochemical method measures the concentration of gas in the gas by utilizing the chemical potential difference between two electrodes, the other electrode is a fixed reference electrode, the characteristic gas chemically reacts with an internal electrolyte when passing through a sensor, and the output voltage value can be changed due to different concentrations; and analyzing hydrogen, acetylene, ethane, ethylene and methane in the characteristic gas as combustible gas, analyzing the concentration of each gas, and storing the analysis result by the communication control unit 15 and sending the analysis result to the main control room through an optical fiber. If the internal fault of the transformer is judged, the internal fault can be directly sent to the circuit breakers on all sides, so that the main transformer can quit operation. The communication control unit has a control panel 18 including an indicator lamp and a buzzer 17 for warning after a failure.
The gas relay is arranged in the power transformer, the raw materials of the power transformer mainly comprise insulating oil and various paper and wood insulating parts, and when the inside of the power transformer breaks down, 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 reaction to form hydrogen, hydrocarbon gas and the like. Hydrogen and hydrocarbon gases are combustible gases, so that transformer accidents can be enlarged and even fire disasters can be caused;
by using the method, the preliminary diagnosis work of the light gas alarm of the transformer is realized, and the communication control unit 15 stores the analysis result and sends the analysis result to the main control room through the optical fiber. If the internal fault of the transformer is judged, the internal fault can be directly sent to the circuit breakers on all sides, so that the main transformer can quit operation. The communication control unit has a control panel 18 including an indicator lamp and a buzzer 17 for warning after a failure.
The transformer combustible gas monitoring device can judge whether the transformer has internal faults or not through the gas flammability at the initial stage of the transformer fault, and prevent the further expansion of the fault.
Claims (9)
1. The utility model provides a transformer combustible gas on-line measuring device, combustible gas are gas combustible gas, are hydrogen, acetylene, ethane, ethylene, methane, and the device is including adopting gas unit (21), gas analysis unit (14), control communication unit (15) and display screen (19), its characterized in that: an oil level sensor (22) is arranged in the automatic gas production unit (21), the bottom of the automatic gas production unit (21) is connected with a third electromagnetic valve (24) through a first metal pipe (23), an oil discharge electromagnetic valve (24) is connected with an accumulated liquid oil tank (26) through a second metal pipe (25), the left side of the upper part of the automatic gas production unit (21) is connected with a gas relay (1) through a gas guide pipe, a first electromagnetic valve (3) is arranged between a first gas guide pipe (2) and a second gas guide pipe (4), and the right side of the upper part of the gas production unit is provided with a gas outlet (6) and is connected with one end of a gas analysis unit (14) through a third gas guide pipe (7), a second electromagnetic valve (8) and a third gas guide pipe; the other end of the gas analysis unit (14) is connected with the exhaust electromagnetic valve (13), signals of an oil level gauge (22) of the gas analysis unit (14) and the automatic gas production unit (21) are connected with the control unit (15) through electric wires, a sensor signal in the gas analysis unit (14) is connected with the control unit (15) through an electric wire, and the control unit (15) is provided with a display screen (19) which displays the signals through the display screen.
2. The transformer combustible gas online detection device of claim 1, characterized in that:
the control unit (15) is provided with a control panel (18), a storage device, a cable and a power line; the communication control unit stores the analysis conclusion, remotely transmits the analysis conclusion to the main control room through a 485 communication cable (20) or an optical fiber and sends a corresponding alarm action signal.
3. The transformer combustible gas online detection device of claim 1, characterized in that:
the control panel comprises an indicator light and a buzzer (17).
4. The transformer combustible gas online detection device of claim 1, characterized in that: the gas analysis unit (14) is internally provided with an electrochemical sensor (10), a catalytic combustion sensor (11) and an infrared gas sensor (12).
5. The transformer combustible gas online detection device of claim 1, characterized in that: the detection device has a metal housing.
6. The method for detecting the transformer combustible gas online detection device according to the claim, characterized in that: the detection method comprises the following steps
Step 1, after an alarm is given to a gas relay 1, a first electromagnetic valve (3) and an oil discharge electromagnetic valve (21) of a gas production unit are automatically opened, insulating oil in the gas production unit (21) flows out to an accumulated liquid oil tank (26) under the pressure action of a transformer conservator, and gas in the gas relay enters the automatic gas production unit (21) through a first gas guide pipe (2), the first electromagnetic valve (3) and a second gas guide pipe (4);
step 2, after an oil level sensor (22) in the automatic gas production unit (21) reaches a set value, the oil discharge electromagnetic valve 25 is automatically closed, the second electromagnetic valve (8) and the exhaust electromagnetic valve (13) are automatically opened, and gas enters the gas analysis unit (14) from the gas production unit 21;
step 3, analyzing concentration values of various characteristic gas components in the gas by using an electrochemical gas sensor (10), a catalytic combustion sensor (11) and an infrared sensor (12) in the gas analysis unit, generating corresponding electric signals and sending the electric signals to a communication control unit (14);
and 4, the communication control unit (14) sends the analysis result to the display screen (19) and sends the analysis result to the main control room through a 485 communication cable (20) or light, if the concentration of the combustible gas contained in the characteristic gas reaches or exceeds a set value, a trip signal is sent, meanwhile, a fault indicator lamp and a buzzer (17) are started to warn operators, and the analysis result is sent to the main control room.
7. The detection method of the transformer combustible gas online detection device according to claim 6, characterized by comprising the following steps: the combustible gas is hydrogen, acetylene, ethane, ethylene and methane.
8. The detection method of the transformer combustible gas online detection device according to claim 6, characterized by comprising the following steps: the gas analysis unit is internally used for analyzing the characteristic gas concentration and the concentration of combustible gas by adopting methods of electrochemistry, catalytic combustion and infrared sensor measurement.
9. The detection method of the transformer combustible gas online detection device according to claim 6, characterized by comprising the following steps: the oil level sensor (22) is installed inside the gas production unit (21) and used for detecting the volume change of characteristic gas inside the gas production unit and has an oil-gas separation function.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010679436 | 2020-07-15 | ||
| CN2020106794363 | 2020-07-15 |
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| CN111999355A true CN111999355A (en) | 2020-11-27 |
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| CN202010999306.8A Pending CN111999355A (en) | 2020-07-15 | 2020-09-22 | Transformer combustible gas online detection device and method |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111276937A (en) * | 2020-03-10 | 2020-06-12 | 郑州赛奥电子股份有限公司 | Digital non-electric quantity protection method of oil-immersed transformer based on volume change |
| CN112600139A (en) * | 2021-01-20 | 2021-04-02 | 深圳市红越电子科技有限公司 | Conductive cable interface detection post-processing terminal |
| CN113008947A (en) * | 2021-02-22 | 2021-06-22 | 国网陕西省电力公司电力科学研究院 | Online monitoring device and method for free gas flammability in transformer gas relay |
| CN113009066A (en) * | 2021-02-22 | 2021-06-22 | 国网陕西省电力公司电力科学研究院 | Gas combustibility on-line monitoring device and method in gas collection box |
| CN114002624A (en) * | 2020-12-31 | 2022-02-01 | 杭州柯林电气股份有限公司 | Electric power internet of things network attack resisting system and control method thereof |
| CN114371193A (en) * | 2022-01-07 | 2022-04-19 | 国网吉林省电力有限公司电力科学研究院 | Transformer fault diagnosis device |
| CN114660262A (en) * | 2022-05-23 | 2022-06-24 | 南方电网科学研究院有限责任公司 | Transformer combustible gas monitoring system |
| CN115097073A (en) * | 2022-06-28 | 2022-09-23 | 重庆理工大学 | Online monitoring device for combustible gas of power transformer |
| CN115097073B (en) * | 2022-06-28 | 2024-10-22 | 重庆理工大学 | On-line monitoring device for combustible gas of power transformer |
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| CN104977391A (en) * | 2015-07-23 | 2015-10-14 | 山东达驰电气有限公司 | Electronic monitor for content of fault gas in transformer gas relay |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111276937A (en) * | 2020-03-10 | 2020-06-12 | 郑州赛奥电子股份有限公司 | Digital non-electric quantity protection method of oil-immersed transformer based on volume change |
| CN114002624A (en) * | 2020-12-31 | 2022-02-01 | 杭州柯林电气股份有限公司 | Electric power internet of things network attack resisting system and control method thereof |
| CN114002624B (en) * | 2020-12-31 | 2023-07-04 | 杭州柯林电气股份有限公司 | Electric power Internet of things network attack resisting system and control method thereof |
| CN112600139A (en) * | 2021-01-20 | 2021-04-02 | 深圳市红越电子科技有限公司 | Conductive cable interface detection post-processing terminal |
| CN113008947A (en) * | 2021-02-22 | 2021-06-22 | 国网陕西省电力公司电力科学研究院 | Online monitoring device and method for free gas flammability in transformer gas relay |
| CN113009066A (en) * | 2021-02-22 | 2021-06-22 | 国网陕西省电力公司电力科学研究院 | Gas combustibility on-line monitoring device and method in gas collection box |
| CN114371193A (en) * | 2022-01-07 | 2022-04-19 | 国网吉林省电力有限公司电力科学研究院 | Transformer fault diagnosis device |
| CN114660262A (en) * | 2022-05-23 | 2022-06-24 | 南方电网科学研究院有限责任公司 | Transformer combustible gas monitoring system |
| CN114660262B (en) * | 2022-05-23 | 2022-08-02 | 南方电网科学研究院有限责任公司 | Transformer combustible gas monitoring system |
| CN115097073A (en) * | 2022-06-28 | 2022-09-23 | 重庆理工大学 | Online monitoring device for combustible gas of power transformer |
| CN115097073B (en) * | 2022-06-28 | 2024-10-22 | 重庆理工大学 | On-line monitoring device for combustible gas of power transformer |
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