CN210776342U - Transformer oil chromatogram on-line monitoring constant temperature equipment - Google Patents
Transformer oil chromatogram on-line monitoring constant temperature equipment Download PDFInfo
- Publication number
- CN210776342U CN210776342U CN201921719530.6U CN201921719530U CN210776342U CN 210776342 U CN210776342 U CN 210776342U CN 201921719530 U CN201921719530 U CN 201921719530U CN 210776342 U CN210776342 U CN 210776342U
- Authority
- CN
- China
- Prior art keywords
- temperature
- oil
- transformer
- monitoring
- line monitoring
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000012544 monitoring process Methods 0.000 title claims abstract description 36
- 230000008859 change Effects 0.000 claims abstract description 21
- 238000003745 diagnosis Methods 0.000 claims abstract description 7
- 238000004458 analytical method Methods 0.000 claims abstract description 6
- 238000004891 communication Methods 0.000 claims abstract description 5
- 238000001514 detection method Methods 0.000 claims description 19
- 238000004587 chromatography analysis Methods 0.000 claims description 10
- 238000010438 heat treatment Methods 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 8
- 238000000926 separation method Methods 0.000 claims description 5
- 230000008878 coupling Effects 0.000 claims description 3
- 238000010168 coupling process Methods 0.000 claims description 3
- 238000005859 coupling reaction Methods 0.000 claims description 3
- 239000011159 matrix material Substances 0.000 claims description 3
- 230000003287 optical effect Effects 0.000 claims description 3
- 230000036760 body temperature Effects 0.000 claims description 2
- 238000012806 monitoring device Methods 0.000 abstract description 47
- 238000005259 measurement Methods 0.000 abstract description 7
- 239000007789 gas Substances 0.000 description 28
- 230000007613 environmental effect Effects 0.000 description 12
- 238000013461 design Methods 0.000 description 10
- 230000008569 process Effects 0.000 description 5
- 238000012545 processing Methods 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 238000009529 body temperature measurement Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000012528 membrane Substances 0.000 description 2
- 238000013139 quantization Methods 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
- 239000012159 carrier gas Substances 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 238000007872 degassing Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000004817 gas chromatography Methods 0.000 description 1
- 239000004519 grease Substances 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 239000012774 insulation material Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000011368 organic material Substances 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
Images
Abstract
The transformer is an important core device of an electric power system, but the on-line monitoring system finds that the temperature difference of the on-site operation environment of the monitoring device is large, and the change of the environment temperature causes the problems that some parts in the system have strict requirements on temperature, can not work at too low temperature or too high temperature, are inaccurate in measurement and the like, the utility model discloses a transformer oil chromatogram on-line monitoring constant temperature device, which comprises a transformer main body, a monitoring work station, a monitoring main station, a control circuit, a monitor, wireless communication, a temperature control device and host fault diagnosis, this constant temperature transformer has solved the electric equipment and has installed the influence that the on-line monitoring device in the open air received ambient temperature change, and thermostated container control system makes whole device at the operation of reasonable temperature interval, and the steady operation of guarantee on-line monitoring device system ensures the accuracy of monitoring data to correct analysis masters equipment running state.
Description
Technical Field
The invention belongs to the field of power equipment, and particularly relates to a transformer oil chromatography online monitoring constant temperature device.
Background
The transformer is an important core device of the power system, and whether the transformer operates safely and stably is crucial to a power grid. The online monitoring device for the gas dissolved in the oil reflects the change conditions of the transformer insulating oil and the operation parameters by monitoring and analyzing the gas dissolved in the transformer insulating oil in real time, finds potential fault hazards of transformer equipment and judges the fault types of the transformer equipment, provides important data for tracking the safe operation state of the transformer in real time, and accordingly ensures safe and stable operation of the transformer and a power grid system.
At present, a plurality of sets of monitoring devices 2000 are commonly connected to a master station platform of an on-line monitoring system of the Gansu power grid (on-line oil chromatography), so that functions of centralized monitoring, safety early warning, fault diagnosis and evaluation and the like of the running state and environmental parameters of the transformer are basically realized, and the running maintenance and management level of the transformer is improved.
However, in the operation process of the online monitoring system, the temperature difference of the on-site operation environment of the monitoring device is large, the temperature can reach more than forty degrees in summer and can reach below-twenty-thirty degrees in winter, and the change of the environmental temperature causes the problems that some parts in the system have strict requirements on temperature, cannot work at too low temperature or too high temperature, are inaccurate in measurement and the like, so that the monitoring data of the online monitoring device for the dissolved gas in the transformer oil cannot be uploaded or a large amount of invalid data appears. The environment temperature is too low, also can cause oil chromatographic permeable membrane to damage, in case the permeable membrane damages the back, the oil of grease chamber just directly gets into the air chamber, and whole chromatographic column, detector, air pump, ration room have all received the pollution, and the core element of instrument is probably damaged. Therefore, the environmental temperature change poses a serious challenge to the real-time monitoring of the operation condition of the transformer equipment by the oil chromatography on-line monitoring device, and great interference is formed for accurately analyzing and mastering the operation state of the transformer equipment.
Disclosure of Invention
Aiming at the problems, the invention designs the transformer oil chromatographic online monitoring constant temperature device, so that the monitoring device operates in a reasonable temperature interval, the influence of the environmental temperature on the online monitoring device for the dissolved gas in the transformer oil is reduced or even eliminated, the stable operation of the online monitoring device system is ensured, the accuracy of online monitoring data is ensured, and the operation state of equipment is accurately mastered in time. In order to achieve the above object, the technical scheme adopted by the invention is as follows:
the transformer oil chromatogram on-line monitoring constant temperature device comprises a transformer main body, a monitoring workstation, a monitoring main station, a control circuit, a monitor, wireless communication and host fault diagnosis, and is characterized by also comprising a temperature control system, a chromatogram detection device, an oil taking valve and an oil return valve; the temperature control system is arranged on the transformer main body and is connected with the chromatographic detection device in a wired or wireless mode; an oil taking valve is arranged in the middle of the transformer oil tank, and an oil return valve is arranged at the bottom of the transformer oil tank; the chromatographic detection device is provided with an oil-gas separation device, a chromatographic detection device and an oil circulation device, one end of the chromatographic detection device is connected with the oil taking valve, and oil paths at two opposite ends enter the oil return valve through the oil circulation device; the gas circuit is connected with the chromatographic detection system for analysis, and the analysis result is fed back to the monitoring workstation and the temperature control system in a wired or wireless mode.
Furthermore, the temperature control device mainly comprises a host, a temperature measuring device, a temperature control module, a display device, a constant temperature box body, a relay, a heater and a refrigerator; wherein the host microprocessor selects an AT89C51 singlechip as a temperature control device control system; the temperature measuring device adopts a digital temperature sensor DS18B 20.
Furthermore, the temperature control module consists of an optical coupling element, a relay, a resistor, a heating sheet, a triode and a fan; when the environment temperature is monitored to change, the singlechip controls the relay to act through the on-off of the triode so as to start the heating sheet to heat or control the fan to refrigerate.
Furthermore, the upper and lower limits of the temperature of the thermostat body are set by adopting a 4 x 4-row matrix key mode, the key mode comprises 0-9 temperature digital keys, a temperature reset key, a decimal point key, a clearing key and a determining key, the key keyboard adopts a non-coding keyboard, and the keys are identified by adopting a global scanning method.
Furthermore, the monitoring device thermostat temperature display device is designed by adopting a nixie tube 7SEG-MPX4-CA, and has 2 4-bit 8-segment common anode nixie tubes in total, wherein one nixie tube displays the ambient temperature in the current monitoring device thermostat box body, and the other nixie tube displays the set temperature required by the normal operation of the monitoring device.
Further, the temperature measuring device system adopts a fuzzy PID control algorithm, the temperature in the incubator collected in real time by the temperature sensor DS18B20 is compared with the preset temperature, the deviation of the temperature control quantity and the temperature deviation change rate are calculated, and the control circuit controls the temperature in the incubator according to the temperature control quantity; the fuzzy PID controller calculates the system input deviation e and the deviation change rate ec, and then carries out fuzzy processing on the input quantity e and ecQuantifying, and utilizing fuzzy inference rule to on-line regulate PID parameter Kp、Ki、KdAnd the output temperature is enabled to reach a set value so as to automatically adjust the ambient temperature in the constant temperature box of the monitoring device.
The invention has the advantages that:
(1) the host machine determines whether to start the heating sheet to heat or control the fan to cool according to the difference value between the measured temperature and the set temperature, so that the temperature in the constant temperature box is kept in the set range.
(2) This thermostated container control system has solved the electric equipment and has installed the influence that the outdoor on-line monitoring device received the ambient temperature change, and thermostated container control system makes whole device at the operation of reasonable temperature interval, and the steady operation of guarantee on-line monitoring device system ensures the accuracy of monitoring data to correct analysis masters equipment running state.
(3) The thermostat control system of the on-line monitoring device adopts a fuzzy PID control algorithm, has the advantages of high temperature regulation speed, large temperature regulation range and stable system, and is suitable for heat preservation of the on-line monitoring device of the electrical equipment in severe environment so as to ensure the normal operation of the monitoring device.
Drawings
FIG. 1 oil chromatogram on-line monitoring device work flow
Wherein 1 transformer main part, 2 chromatographic detection systems, 3 oil-gas separation device, 4 vacuum cycle device, 5 get the fuel tap, 6 return oil valves, 7 RS485 wired or GPRS wireless device, 8 control workstation, 9 control main website.
FIG. 2 block diagram of thermostat control system of monitoring device
FIG. 3 shows the interface connection between DS18B20 and the single chip microcomputer
FIG. 4 flow chart of the main program of the system
FIG. 5 fuzzy PID controller structure diagram
Detailed Description
The invention is described in detail below with reference to the accompanying drawings:
in order to ensure safe operation of transformers and other oil-filled electrical equipment, gas chromatography is used to detect characteristic gases dissolved in insulating oil to predict possible faults in oil-filled electrical equipment and to monitor operation of the equipment. If a fault exists in the power transformer, the insulating oil and the organic material are subjected to chemical reaction under the action of heat and electricity, and a small amount of various gases such as low molecular hydrocarbon gases, carbon dioxide, carbon monoxide and the like are generated and dissolved in the transformer insulating oil. The content and gas production rate of the dissolved gas in the transformer insulating oil have great relation with the type and severity of the fault in the equipment, and the content and gas production rate of the dissolved gas in the insulating oil are analyzed, so that whether the fault exists in the transformer equipment can be roughly judged, whether the fault belongs to a thermal fault or an electrical fault and the severity of the fault can be roughly judged, and the development state of the fault in the transformer can be monitored at any time.
The working process of the oil chromatography on-line monitoring device is shown in figure 1, and the on-line monitoring device for the dissolved gas in the transformer oil mainly comprises gas detection, oil chromatography analysis, oil-gas separation, a control circuit, a monitor, wireless communication, host fault diagnosis and the like.
The working process of the oil chromatogram on-line monitoring device is as follows: after the detection time set by a user is up, the system opens the oil inlet valve, the transformer oil enters the oil-gas separator through the oil valve port by means of the oil pressure of the transformer oil, fault characteristic gas dissolved in the oil is separated out, residual oil enters the oil tank through oil circulation, the separated characteristic gas enters the chromatographic detector along with carrier gas, the component concentration characteristics of various gases are converted into electric signals by the detector, the electric signals are subjected to analog-to-digital conversion by the data processor and are sent to the host computer to be collected into a spectrogram, the spectrogram is analyzed and processed to obtain concentration data of each component, then the concentration data of each gas component is transmitted to a monitoring workstation through a communication monitoring module, working software processes the concentration data to form a concentration change trend graph of each component of each characteristic gas, and a fault diagnosis system carries out fault diagnosis according to the concentration change spectrogram of each characteristic gas to judge the fault type.
The change of the field environment temperature has great influence on the working states of an oil-gas separation module, a gas detection module and a data acquisition and processing module which are contained in the on-line monitoring device. Most of the on-line oil chromatography monitoring devices at home and abroad adopt a film permeation method for degassing, and the environmental temperature also has direct influence on the permeation process. When the macromolecular breathable film continuously works on site, the monitoring temperature should be kept unchanged as much as possible, and for monitoring the change condition of the site environment temperature, the influence of the change of the environment temperature on the detection result should be compensated.
The overall design of the temperature control system of the monitoring device is as follows:
the structural block diagram of the thermostat control system of the online monitoring device for the dissolved gas in the transformer oil is shown in fig. 2. According to the operating environment of the on-line monitoring device for on-site oil chromatography, in order to enable the on-line monitoring system to normally operate in a reasonable temperature range, a constant temperature control system for an instrument box of the on-line monitoring device for dissolved gas in transformer oil is designed, the system sends temperature data acquired by a temperature sensor to a single chip microcomputer for processing, a host judges that the measured temperature exceeds a set temperature range, the single chip microcomputer sends a level control signal to start a heating sheet for heating or a refrigerating fan for refrigerating, and the ambient temperature in the incubator is kept within a constant range. The monitoring device thermostat system mainly comprises a host, a temperature measuring device, a temperature control device, a display device, a box body, a heater, a refrigerator and the like.
And hardware required by the system is selected according to the overall design of the temperature control system, and comprises a host, a temperature measuring device, a temperature control driving device, a box body heat insulation material, hardware required in a display and alarm circuit, a connection mode and the like.
One, the host computer
The microprocessor selects an AT89C51 singlechip as a host of the thermostat control system of the monitoring device, the singlechip has the characteristics of low voltage, convenient and flexible control, low price, good use performance and the like, and provides a control application scheme with high flexibility and low cost for a plurality of automatic control systems, so the singlechip is widely applied to various control fields.
The single chip microcomputer AT89C51 controls the start and stop of the heater or the refrigerator through the temperature data acquired by the temperature sensor, so that the temperature of the system incubator is controlled within a set range, and the normal operation of an online monitoring device in the incubator is ensured.
Temperature detection module
When the traditional analog signal temperature sensor is used for measuring temperature in the environment, due to the problems of multipoint temperature measurement switching errors, zero drift errors of an amplifying circuit and the like, the monitoring field environment is very severe, various electromagnetic interference and the like exist, and the influence on the measurement result and the measurement precision of the analog signal temperature sensor is great. Therefore, when the temperature in the control system of the oil chromatogram on-line monitoring device thermostat is measured, the novel digital temperature sensor DS18B20 is adopted to solve the problems existing in the traditional temperature sensor, the temperature sensor DS18B20 has strong environmental electromagnetic interference resistance, small volume, high measurement precision and wide temperature measurement range, the monitoring temperature range is-55-125 ℃, and the measurement precision is +/-0.5 ℃. The interface circuit of the single chip microcomputer and the DS18B20 is shown in figure 3.
The signal directly output by the DS18B20 measurement result is a digital temperature signal, the temperature signal is transmitted to the microprocessor in a serial mode of one-wire bus, and the CRC check code is transmitted to the processor at the same time, so that the anti-electromagnetic interference capability and the error correction check capability are extremely strong. When the temperature measuring system works normally, after the microprocessor sends read and write commands to the digital temperature sensor DS18B20, according to the read and write time sequence, the DS18B20 converts the acquired environmental temperature data in the box body into sixteen-bit binary data, and sends the sixteen-bit binary data to the microprocessor.
Third, temperature control module design
The temperature control module mainly comprises an optical coupling element, a relay, a resistor, a heating sheet, a triode, a fan and the like. When the environment temperature is monitored to change, the singlechip controls the relay to act through the on-off of the triode so as to start the heating sheet to heat or control the fan to refrigerate. The selection of relay is the main element for determining the stability and sensitivity of control circuit, and the system design adopts solid relay, and it has the characteristics of small control power, strong radio frequency anti-interference capability, quick switching conversion speed, long service time and high sensitivity[8]。
After an incubator control system of the oil chromatography monitoring device is started, a temperature sensor DS18B20 monitors the change of the environmental temperature in real time, if the environmental temperature is lower than the preset lower temperature limit, a single chip microcomputer AT89C51 sends a high level signal to enable a triode to be conducted, and a relay controls a heating sheet to heat the triode, so that the environmental temperature of the incubator rises; if the ambient temperature is higher than the preset upper limit, the single chip microcomputer AT89C51 sends a low level signal to stop the triode, and the relay controls the fan to cool down, so that the ambient temperature in the incubator is reduced. Therefore, the temperature control module can control the ambient temperature of the temperature control box of the monitoring device, so that the online monitoring device operates in a set temperature environment.
Fourth, temperature upper and lower limit setting module
The upper and lower limits of the temperature of the thermostat body are set by adopting a 4 x 4-row matrix key mode, the key mode comprises 0-9 temperature digital keys, a temperature reset key, a decimal point key, a clearing key and a determining key, the key keyboard adopts a non-coding keyboard, and the keys are identified by adopting a global scanning method.
Display module
The temperature display of the monitoring device thermostat is designed by adopting a nixie tube 7SEG-MPX4-CA, and the number of the nixie tubes is 2, 4, 8 and the same anode nixie tube, wherein one nixie tube displays the ambient temperature in the current monitoring device thermostat box, and the other nixie tube displays the set temperature required by the normal operation of the monitoring device.
3 System software design
The temperature control system of the oil chromatogram on-line monitoring device adopts AT89C51 as a core processing device, temperature data acquired in real time by a temperature sensor DS18B20 is sent to a host processor and a display, meanwhile, the processor compares the measured temperature with the preset temperature, judges whether the environmental temperature exceeds the set upper limit and the set lower limit, and determines whether a heater or a refrigerator is started to control the change of the environmental temperature in the box according to the judgment result.
3.1 Main program design
The temperature control system software adopts a modular design idea and mainly comprises a monitoring device environment temperature detection module design, a thermostat body temperature control module design, a temperature setting key drive, a temperature display module design and the like. A flow chart of the main program of the monitoring device oven temperature control system is shown in fig. 4.
The temperature sensor DS18B20 resets, initializes the function and the sensor acquires temperature and switches the program as follows:
3.2 fuzzy PID controller design
The fuzzy PID control is based on the traditional PID control, fuzzy set control theory is utilized to carry out fuzzy quantization on the input deviation and the deviation change rate of the controller, and PID parameters are automatically adjusted on line through a fuzzy inference rule, so that the output quantity of a control system reaches an expected target, and a good control effect is achieved. The monitoring device thermostat system is realized by a single chip microcomputer through software by adopting a fuzzy PID control algorithm, the deviation of a temperature control quantity and the temperature deviation change rate are calculated according to the comparison of the temperature in the thermostat acquired by a temperature sensor DS18B20 in real time and the preset temperature, and a control circuit controls the temperature in the thermostat according to the temperature control quantity.
The fuzzy PID controller calculates the input deviation e and the deviation change rate ec of the system, then carries out fuzzy quantization on the input quantity e and ec, and utilizes the fuzzy inference rule to adjust the PID parameter K on linep、Ki、KdTo make the output temperature reach the set value so as to automatically adjust the ambient temperature in the thermostat of the monitoring device, the structure of which is shown in fig. 5.
Simulation experiments show that the monitoring device thermostat temperature controller has high anti-interference performance, small overshoot range, fast dynamic response, wide temperature regulation range and high precision compared with a PID control phase by adopting fuzzy PID control, the temperature difference between the temperature controlled by the controller and the environment can reach 30 ℃ at most, and the temperature control precision reaches plus or minus 0.5 ℃.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be able to cover the technical scope of the present invention and the equivalent alternatives or modifications according to the technical solution and the inventive concept of the present invention within the technical scope of the present invention.
Claims (5)
1. The transformer oil chromatogram on-line monitoring constant temperature device comprises a transformer main body, a monitoring workstation, a monitoring main station, a control circuit, a monitor, wireless communication and host fault diagnosis, and is characterized by also comprising a temperature control system, a chromatogram detection device, an oil taking valve and an oil return valve; the temperature control system is arranged on the transformer main body and is connected with the chromatographic detection device in a wired or wireless mode; an oil taking valve is arranged in the middle of the transformer oil tank, and an oil return valve is arranged at the bottom of the transformer oil tank; the chromatographic detection device is provided with an oil-gas separation device, a chromatographic detection system and an oil circulation device, one end of the chromatographic detection device is connected with the oil taking valve, and oil paths at two opposite ends enter the oil return valve through the oil circulation device; the gas circuit is connected with the chromatographic detection system for analysis, and the analysis result is fed back to the monitoring workstation and the temperature control system in a wired or wireless mode.
2. The transformer oil chromatogram on-line monitoring thermostat device of claim 1, wherein the temperature control system mainly comprises a host, a temperature measuring device, a temperature control module, a display device, a thermostat box, a relay, a heater and a refrigerator; the microprocessor used by the host selects an AT89C51 singlechip for the temperature control system; the temperature measuring device adopts a digital temperature sensor DS18B 20.
3. The transformer oil chromatogram on-line monitoring thermostat device of claim 2, characterized in that the temperature control module is composed of an optical coupling element, a relay, a resistor, a heating plate, a triode and a fan; when the environment temperature is monitored to change, the singlechip controls the relay to act through the on-off of the triode so as to start the heating sheet to heat or control the fan to refrigerate.
4. The transformer oil chromatography online monitoring thermostat device of claim 2, wherein the thermostat box body temperature upper and lower limits are set in a 4 x4 matrix key mode, the key mode comprises a 0-9 temperature digital key, a temperature reset key, a decimal point key, a clear key and a confirm key, the key keyboard adopts a non-coding keyboard, and the keys are identified by a global scanning method.
5. The on-line monitoring thermostat device for transformer oil chromatography as claimed in claim 2, wherein the display device is designed by using nixie tube 7SEG-MPX4-CA, and there are 2 total 4-bit 8-segment common anode nixie tubes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921719530.6U CN210776342U (en) | 2019-10-14 | 2019-10-14 | Transformer oil chromatogram on-line monitoring constant temperature equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921719530.6U CN210776342U (en) | 2019-10-14 | 2019-10-14 | Transformer oil chromatogram on-line monitoring constant temperature equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210776342U true CN210776342U (en) | 2020-06-16 |
Family
ID=71045614
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921719530.6U Active CN210776342U (en) | 2019-10-14 | 2019-10-14 | Transformer oil chromatogram on-line monitoring constant temperature equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210776342U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113804800A (en) * | 2021-07-01 | 2021-12-17 | 国网四川省电力公司电力科学研究院 | Quick online monitoring device and method for multi-point transformer |
| CN114047275A (en) * | 2022-01-17 | 2022-02-15 | 华谱科仪(北京)科技有限公司 | Temperature control method and device for chromatograph |
-
2019
- 2019-10-14 CN CN201921719530.6U patent/CN210776342U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113804800A (en) * | 2021-07-01 | 2021-12-17 | 国网四川省电力公司电力科学研究院 | Quick online monitoring device and method for multi-point transformer |
| CN114047275A (en) * | 2022-01-17 | 2022-02-15 | 华谱科仪(北京)科技有限公司 | Temperature control method and device for chromatograph |
| CN114047275B (en) * | 2022-01-17 | 2022-04-08 | 华谱科仪(北京)科技有限公司 | Temperature control method and device for chromatograph |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN210776342U (en) | Transformer oil chromatogram on-line monitoring constant temperature equipment | |
| CN101666784B (en) | Chromatographic instrument calibration device | |
| CN102654286B (en) | Intelligent dynamic combustion atmosphere controller | |
| WO2021043036A1 (en) | Field detection device, system and method for achieving no maintenance of gas density relay | |
| CN109812902B (en) | Subway electrical equipment room air conditioner energy-saving system and method based on infrared heat source monitoring | |
| CN103543773A (en) | Microenvironment intelligent control system and microenvironment intelligent control method | |
| CN2932374Y (en) | SF6 intelligent environment monitoring and control system and its SF6 laser detector | |
| CN203881713U (en) | Online ultrasonic wave monitoring system for SF6 gas in transformer substation | |
| CN203561906U (en) | Microenvironment intelligent control system | |
| CN114484649A (en) | Constant temperature control system and constant temperature control method | |
| CN211426409U (en) | Atmospheric environment monitoring system | |
| CN113125603A (en) | Performance detection system of transformer oil chromatographic on-line monitoring device | |
| CN103512962B (en) | Simulation system and method for chromatographic on-line detection of transformer oil gas | |
| CN103869091A (en) | Device and method for online detecting oxygen and carbon dioxide in biological fermentation tail gas | |
| CN210863966U (en) | Electrical equipment and system for realizing maintenance-free density relay | |
| CN201723212U (en) | Automatic metering control system for oilfield metering station | |
| CN110702735A (en) | Residual chlorine electrode calibration method and water quality detection instrument | |
| CN201522637U (en) | Intelligent control device of water treatment system | |
| CN114113384A (en) | Power transformer body and on-load tap-changer integrated chromatographic on-line monitoring device | |
| CN201698227U (en) | Check table for main variable temperature controller | |
| CN103105205B (en) | Combustion gas, hot water, heating comprehensive detection system and method | |
| CN204330692U (en) | Based on the on-line monitoring device of integrated photovoltaic substation transformer | |
| CN114002009A (en) | Multi-index online continuous detection method and system for water vapor quality of power plant | |
| CN207198118U (en) | Gases Dissolved in Transformer Oil on-line monitoring system | |
| CN207623240U (en) | Colorimetric tube detection device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |