CN103197708A - Temperature control system simulating standard oil sample preparation device of transformer - Google Patents
Temperature control system simulating standard oil sample preparation device of transformer Download PDFInfo
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Abstract
The invention relates to a temperature control system simulating a standard oil sample preparation device of a transformer. The system comprises a circulation pump, an oil-way circulation pipeline, an oil tank and an electro-magnetic valve and is characterized in that the system further comprises an oil tank heating tape, an oil-way pipeline heating strip, a pipeline temperature sensor, a temperature controller, heat insulation layers and an oil tank temperature sensor, wherein the oil tank heat tape is evenly wound on the outer wall of an oil cylinder, the heat insulation layers respectively coat the outer portion of the oil tank and the outer portion of the oil-way circulation pipeline, the circulation pump and the electro-magnetic valve are installed on the oil-way circulation pipeline, the temperature sensor is located in the oil-way circulation pipeline, and the temperature controller is communicated with an upper machine with controlling software through bluetooth or a USB. The temperature control system simulating the standard oil sample preparation device of the transformer achieves integration of heating, temperature testing and temperature controlling, achieves automatic control, provides a stable temperature environment for gas-liquid mixture of the standard oil sample preparation device, enables an oil way to be heated evenly, and prevents splitting caused by oil temperature local overheating in a heating process.
Description
Technical field
The present invention relates to a kind of temperature control system of analogue transformer standard oil sample device for formulating, be mainly used in even heating and the insulation of the oil sample device for formulating of dissolved gas.
Background technology
At present, to the detection of transformer oil dissolved gas on-Line Monitor Device, the laboratory gas chromatography that existing power industry inspection specification is recommended, checkout procedure is long, operating process is loaded down with trivial details, artificial test error is more, be not suitable for carrying out field-checking.Domestic at after the on-the-spot installation of transformer oil dissolved gas on-Line Monitor Device, how to assess this system monitoring validity, and system detects validity behind the long-play, the relevant rules of Shang Weijian are put into effect, many on-Line Monitor Device are checked the correlation technique index before just installing at the scene, basically its monitoring validity was not carried out check after the installation, these problems have become the bottleneck of on-line monitoring system development.
Design the device of the certain characteristic gas content of a kind of special preparation transformer oil, the transformer oil characteristic gas is mixed with certain proportioning with transformer oil, the sample oil of its preparation is measured its concentration data near its theoretical concentration through the laboratory chromatograph, can with the preparation oil sample as the standard oil sample, be directly used in the calibration operation of oil dissolved gas on-Line Monitor Device, standard oil sample with well-known theory concentration is standard substance, realization does not need to do the laboratory chromatograph again and demarcates contrast the verification of on-Line Monitor Device.
According to " Measurement Law of the People's Republic of China " regulation, standard substance is to be principal character with the stability, uniformity of value and accuracy.Transformer insulation oil standard oil sample process for preparation is the principle of utilizing the gas-liquid two-phase dissolution equilibrium, and temperature directly has influence on the solute effect of characteristic gas in oil, the temperature height, and gas component concentrations is big; Temperature is low, and gas component concentrations is low, and the height shakiness of temperature must cause the content concn shakiness of characteristic gas in oil.Conventional heater element can be selected powerful heater element, heating rod for example, its rate of heat addition height, can realize the temperature increase to insulating oil fast, but need be posted on the fuel tank outside during assembling, owing to be that contact area is little, the short time forms local overheating because of heat accumulation easily.When the insulating oil temperature reaches 100 ℃ the thermal decomposition effect can take place, discharge the gas composition that can influence testing result.So this kind type of heating should not be used for the heating of insulating oil.Because it is bigger that standard oil thermal capacity requires, if select the low-power heater element for use, heating power is little, and firing rate is slow, influences work efficiency, also should not be used for the heating material of insulating oil.So the instability of insulating oil temperature and localized hyperthermia, the insulating oil that can cause directly influences the check results of on-Line Monitor Device as the deviation of standard substance.
Summary of the invention
Technical matters to be solved by this invention provides a kind of temperature control system of analogue transformer standard oil sample device for formulating, and the standard oil sample of producing is mainly used in the verification of transformer chromatogram monitoring device.
The present invention adopts following technical scheme:
The present invention includes ebullator, oil circulation pipeline, oil tank and solenoid valve, it is characterized in that it also comprises oil tank heating tape, oil line pipe heater strip, Tube Temperature Sensor, temperature controller, heat-insulation layer and oil tank temperature sensor; Described oil tank heating tape uniform winding is on the oil cylinder outer wall, and described heat-insulation layer is coated on respectively by the oil tank after oil tank heating tape and the winding of oil line pipe heater strip and the outside of oil circulation pipeline; Described oil circulation pipeline connects oil tank upper end oil-in and lower end oil-out; Described ebullator and solenoid valve are installed on the oil circulation pipeline; Described temperature sensor is installed in the oil circulation pipeline; Described temperature controller is communicated by letter with the host computer that control software is housed by bluetooth or USB;
Described temperature controller comprises single chip machine controlling circuit, I/O driving circuit, A/D converter, liquid crystal display circuit and communication module; The output terminal of described A/D converter connects the respective input of single chip machine controlling circuit, and the corresponding output end of described single chip machine controlling circuit connects the input end of I/O driving circuit and liquid crystal display circuit respectively; Described communication module is connected with single chip machine controlling circuit is two-way; The respective input of described A/D converter is taken over the output terminal of channel temp sensor and oil tank temperature sensor respectively, and the output terminal of described I/O driving circuit is controlled the break-make of oil tank heating tape, ebullator, oil line pipe heater strip, solenoid valve respectively.
The beneficial effect that the present invention produces is: by the oil tank heating tape, the oil line pipe heater strip, heat-insulation layer and oil tank temperature sensor are realized heating, heat radiation, insulation, utilize the Tube Temperature Sensor thermometric, realize the integrated and control automatically of temperature control in conjunction with temperature controller, for mixing, standard oil sample device for formulating gas-liquid two-phase provides the equilibrium temperature environment, the oil tank heating tape makes the oil circuit homogeneous heating, prevent oily temperature local overheating generation cracking in the heating process, guarantee the accuracy of standard oil, avoided transformer oil dissolved gas on-Line Monitor Device because of the different systematic error that causes of the oily temperature difference.
Description of drawings
Fig. 1 is structural representation of the present invention;
Fig. 2 is the circuit theory piece figure of temperature controller among the present invention;
Fig. 3 is the circuit theory diagrams (single chip machine controlling circuit, display circuit) of temperature controller among the present invention;
Fig. 4 is the circuit theory diagrams (I/O driving circuit) of temperature controller among the present invention;
The circuit theory diagrams of temperature controller (A/D converter) among Fig. 5 the present invention;
The circuit theory diagrams of temperature controller (communication module) among Fig. 6 the present invention.
Wherein, 1 oil tank heating tape, 2 ebullators, 3 oil line pipe heater strips, 4 oil circulation pipelines, 5 Tube Temperature Sensors, 6 oil cylinders, 7 temperature controllers, 8 heat-insulation layers, 9 oil tank temperature sensors, 10 solenoid valves.Solid line among Fig. 1 represents the oil circulation pipeline, the dot-and-dash line representation signal.
Embodiment
By the embodiment shown in Fig. 1 ~ 6 as can be known, it comprises ebullator 2, oil circulation pipeline 4, oil tank 6 and solenoid valve 10, it is characterized in that it also comprises oil tank heating tape 1, oil line pipe heater strip 3, Tube Temperature Sensor 5, temperature controller 7, heat-insulation layer 8 and oil tank temperature sensor 9; Described oil tank heating tape 1 uniform winding is on the oil cylinder outer wall, and described heat-insulation layer 8 is coated on respectively by the oil tank 6 after oil tank heating tape 1 and 3 windings of oil line pipe heater strip and the outside of oil circulation pipeline 4; Described oil circulation pipeline 4 connects oil tank 6 upper end oil-ins and lower end oil-out; Described ebullator 2 and solenoid valve 10 are installed on the oil circulation pipeline 4; Described temperature sensor 5 is installed in the oil circulation pipeline 4; Described temperature controller 7 is communicated by letter with the host computer that control software is housed by bluetooth or USB;
Described temperature controller 7 comprises single chip machine controlling circuit, I/O driving circuit, A/D converter, liquid crystal display circuit and communication module; The output terminal of described A/D converter connects the respective input of single chip machine controlling circuit, and the corresponding output end of described single chip machine controlling circuit connects the input end of I/O driving circuit and liquid crystal display circuit respectively; Described communication module is connected with single chip machine controlling circuit is two-way; The respective input of described A/D converter is taken over the output terminal of channel temp sensor 5 and oil tank temperature sensor 9 respectively, and the output terminal of described I/O driving circuit is controlled the break-make of oil tank heating tape 1, ebullator 2, oil line pipe heater strip 3, solenoid valve 10 respectively.
Described single chip machine controlling circuit is made up of single-chip microcomputer U4 and peripheral component crystal oscillator Y1, capacitor C 1 ~ C3, resistance R 1, exclusion RP1; Described crystal oscillator Y1 is connected between 18 and 19 pin of single-chip microcomputer U4, and capacitor C 1 is connected between 18 pin and ground of single-chip microcomputer U4, and capacitor C 2 is connected between 19 pin and ground of single-chip microcomputer U4; Be connected on after 1 series connection of capacitor C 3 and resistance R+5V power supply and ground between, 9 pin of single-chip microcomputer U4 are connected on the node of capacitor C 3 and resistance R 1, form automatic reset circuit; 32 ~ 39 pin of single-chip microcomputer U4 run in successively and hinder 9 ~ 2 pin of RP1, and 40 pin of single-chip microcomputer U4 and 1 pin of exclusion RP1 all connect+5V.
Described liquid crystal display circuit is made up of Liquid Crystal Module U3 and peripheral component resistance R 2 thereof, slip power transformation resistance R3; Be connected between 18 ~ 19 pin of Liquid Crystal Module U3 after described resistance R 2 and the slip power transformation resistance R3 series connection, 3 pin of Liquid Crystal Module U3 connect the sliding end of slide rheostat R3,7 ~ 14 pin of Liquid Crystal Module U3 connect 39 ~ 32 pin of single-chip microcomputer U4 successively, 2 pin of Liquid Crystal Module U3 connect+5V, 1 pin of Liquid Crystal Module U3 and 20 pin ground connection.
Described I/O driving circuit is made up of Darlington array U2 and peripheral component relay J 1 ~ J3, socket Z1 ~ Z4; Described oil line pipe heater strip 3 is connected between 1 pin and 5 pin of socket Z1, and described oil tank heating tape 1 is connected between 1 pin and 5 pin of socket Z2, and described ebullator 2 is connected between 1 pin and 5 pin of socket Z3, and described solenoid valve 10 is connected between 1 pin and 2 pin of socket Z4; 1 ~ 7 pin of described Darlington array U2 connects 21 ~ 27 pin of single-chip microcomputer U4 successively; 14 ~ 16 pin of Darlington array U2 connect the control relay circuit of ebullator 2, oil tank heating tape 1 and oil line pipe heater strip 3 respectively, wherein, the control relay circuit of ebullator 2 comprises relay J 3 and socket Z3, the coil of described relay J 3 be connected on Darlington array U2 16 pin and+5V between, the normally opened contact J3-3 of relay J 3 is connected between 3 pin and 5 pin of socket Z3,2 pin of socket Z3 are connected with 3 pin, 1 pin of socket Z3 is connected with 4 pin, and the bipod after the connection connects the 220V alternating current; The structure of oil tank heating tape 1 and the control relay circuit of oil line pipe heater strip 3 is identical with ebullator 2; 2 ~ 5 pin of socket Z4 connect 13 ~ 10 pin of Darlington array U2, and 1 pin of socket Z4 connects+24V; The 8 pin ground connection of Darlington array U2,9 pin of Darlington array U2 connect+5V.
Described A/D converter is made up of integrated package U6 and peripheral component crystal oscillator Y2, capacitor C 4 ~ C8, resistance R 4 ~ R5, socket Z5 ~ Z6; Three output terminals of described oil circuit temperature sensor 5 connect respectively between 1 ~ 3 pin of Z5, and three output terminals of described oil tank temperature sensor 9 connect respectively between 1 ~ 3 pin of Z6; 1 pin of described integrated package U6 connects 1 pin of single-chip microcomputer U4, and 14 ~ 12 pin of integrated package U6 are corresponding 13 pin, 3 pin, 2 pin that meet single-chip microcomputer U4 respectively, and 5 pin of integrated package U6 connect+5V, 4 pin of integrated package U6,6 pin, 8 pin, 10 pin, 11 pin ground connection; 2 pin of described socket Z5 ~ Z6 connect 6 ~ 7 pin of integrated package U6 respectively, and 1 pin of socket Z5 ~ Z6 connects+5V, 3 pin ground connection; Described crystal oscillator Y2 is connected between 2 pin and 3 pin of integrated package U6, and capacitor C 4 is connected between 2 pin and ground of integrated package U6, and capacitor C 5 is connected between 3 pin and ground of integrated package U6; Capacitor C 6 is connected on+5V power supply and ground between, be connected on after resistance R 4 ~ R5 series connection+5V power supply and ground between, 9 pin of integrated package U6 are connected on the node of R4 and R5, are connected between the node and ground of R4 and R5 the 10 pin ground connection of integrated package U6 after capacitor C 7 ~ C8 parallel connection.
Described communication module is made up of bluetooth integrated package U1, USB integrated package U5 and double-point double-throw switch S1; 2 stationary contacts of described double-point double-throw switch S1 connect 10 pin, 11 pin of single-chip microcomputer U4, and the swing arm selectivity of double-point double-throw switch S1 inserts 2 ~ 3 pin of bluetooth integrated package U1 or USB integrated package U5; 1 pin of described bluetooth integrated package U1 and USB integrated package U5 all connects+5V, the equal ground connection of its 4 pin.
Described oil tank heating tape 1 and oil line pipe heater strip 3 be the flat belt-like thing for being made up of thermo electric material and insulating material all, and described thermo electric material is nickel-chrome, and described insulating material is the multilayer alkali-free glass fibre; Described heat-insulation layer 8 is hard polyurethane foams.
Described pipe temperature sensing element device 5 and oil tank temperature sensor 9 are platinum resistance formula sensor.
In the present embodiment, the model of described composite crystal array U2 is ULN2003A (16); The model of described Liquid Crystal Module U3 is SMG12864; The model of described single-chip microcomputer U4 is AT89c51; The model of described integrated package U6 is AD7705; The model of described bluetooth integrated package U1 is GC-04; The model of described USB integrated package U5 is ZF-23V4.0; Described oil tank heating tape be maximum temperature can reach 70 ℃ from temperature control heated at constant temperature ribbon.
A kind of control step of temperature control system of analogue transformer standard oil sample device for formulating is as follows:
(1) set the constant temperature value in the host computer of controlling software described being equipped with, host computer sends to temperature controller 7 by bluetooth or USB with the constant temperature value of setting;
(2) according to the temperature control program in the single chip machine controlling circuit in the temperature controller 7, the pilot relay switching frequency, thereby adjust the heat time heating time of oil tank heating tape 1 and oil line pipe heater strip 3, control ebullator 2, solenoid valve 10 work, simultaneously the A/D converter receiving pipeline temperature-sensing element 5 in temperature controller 7 and the value of feedback of oil tank temperature sensor 9, the single chip machine controlling circuit in the input temp controller 7;
(3) on off state of each relay can be shown on the LCDs in the thermostat module temperature controller 7.
Claims (8)
1. the temperature control system of an analogue transformer standard oil sample device for formulating, it comprises ebullator (2), oil circulation pipeline (4), oil tank (6) and solenoid valve (10), it is characterized in that it also comprises oil tank heating tape (1), oil line pipe heater strip (3), Tube Temperature Sensor (5), temperature controller (7), heat-insulation layer (8) and oil tank temperature sensor (9); Described oil tank heating tape (1) uniform winding is on the oil cylinder outer wall, and described heat-insulation layer (8) is coated on respectively by the oil tank (6) after oil tank heating tape (1) and oil line pipe heater strip (3) winding and the outside of oil circulation pipeline (4); Described oil circulation pipeline (4) connects oil tank (6) upper end oil-in and lower end oil-out; Described ebullator (2) and solenoid valve (10) are installed on the oil circulation pipeline (4); Described temperature sensor (5) is installed in the oil circulation pipeline (4); Described temperature controller (7) is communicated by letter with the host computer that control software is housed by bluetooth or USB;
Described temperature controller (7) comprises single chip machine controlling circuit, I/O driving circuit, A/D converter, liquid crystal display circuit and communication module; The output terminal of described A/D converter connects the respective input of single chip machine controlling circuit, and the corresponding output end of described single chip machine controlling circuit connects the input end of I/O driving circuit and liquid crystal display circuit respectively; Described communication module is connected with single chip machine controlling circuit is two-way; The respective input of described A/D converter is taken over the output terminal of channel temp sensor (5) and oil tank temperature sensor (9) respectively, and the output terminal of described I/O driving circuit is controlled the break-make of oil tank heating tape (1), ebullator (2), oil line pipe heater strip (3), solenoid valve (10) respectively.
2. the temperature control system of a kind of analogue transformer standard oil sample device for formulating according to claim 1 is characterized in that described single chip machine controlling circuit is made up of single-chip microcomputer U4 and peripheral component crystal oscillator Y1, capacitor C 1 ~ C3, resistance R 1, exclusion RP1; Described crystal oscillator Y1 is connected between 18 and 19 pin of single-chip microcomputer U4, and capacitor C 1 is connected between 18 pin and ground of single-chip microcomputer U4, and capacitor C 2 is connected between 19 pin and ground of single-chip microcomputer U4; Be connected on after 1 series connection of capacitor C 3 and resistance R+5V power supply and ground between, 9 pin of single-chip microcomputer U4 are connected on the node of capacitor C 3 and resistance R 1, form automatic reset circuit; 32 ~ 39 pin of single-chip microcomputer U4 run in successively and hinder 9 ~ 2 pin of RP1, and 40 pin of single-chip microcomputer U4 and 1 pin of exclusion RP1 all connect+5V.
3. the temperature control system of a kind of analogue transformer standard oil sample device for formulating according to claim 2 is characterized in that described liquid crystal display circuit is made up of Liquid Crystal Module U3 and peripheral component resistance R 2 thereof, slip power transformation resistance R3; Be connected between 18 ~ 19 pin of Liquid Crystal Module U3 after described resistance R 2 and the slip power transformation resistance R3 series connection, 3 pin of Liquid Crystal Module U3 connect the sliding end of slide rheostat R3,7 ~ 14 pin of Liquid Crystal Module U3 connect 39 ~ 32 pin of single-chip microcomputer U4 successively, 2 pin of Liquid Crystal Module U3 connect+5V, 1 pin of Liquid Crystal Module U3 and 20 pin ground connection.
4. the temperature control system of a kind of analogue transformer standard oil sample device for formulating according to claim 3 is characterized in that described I/O driving circuit is made up of Darlington array U2 and peripheral component relay J 1 ~ J3, socket Z1 ~ Z4; Described oil line pipe heater strip (3) is connected between 1 pin and 5 pin of socket Z1, described oil tank heating tape (1) is connected between 1 pin and 5 pin of socket Z2, described ebullator (2) is connected between 1 pin and 5 pin of socket Z3, and described solenoid valve (10) is connected between 1 pin and 2 pin of socket Z4; 1 ~ 7 pin of described Darlington array U2 connects 21 ~ 27 pin of single-chip microcomputer U4 successively; 14 ~ 16 pin of Darlington array U2 connect the control relay circuit of ebullator (2), oil tank heating tape (1) and oil line pipe heater strip (3) respectively, wherein, the control relay circuit of ebullator (2) comprises relay J 3 and socket Z3, the coil of described relay J 3 be connected on Darlington array U2 16 pin and+5V between, the normally opened contact J3-3 of relay J 3 is connected between 3 pin and 5 pin of socket Z3,2 pin of socket Z3 are connected with 3 pin, 1 pin of socket Z3 is connected with 4 pin, and the bipod after the connection connects the 220V alternating current; The structure of oil tank heating tape (1) and the control relay circuit of oil line pipe heater strip (3) is identical with ebullator (2); 2 ~ 5 pin of socket Z4 connect 13 ~ 10 pin of Darlington array U2, and 1 pin of socket Z4 connects+24V; The 8 pin ground connection of Darlington array U2,9 pin of Darlington array U2 connect+5V.
5. the temperature control system of a kind of analogue transformer standard oil sample device for formulating according to claim 4 is characterized in that described A/D converter is made up of integrated package U6 and peripheral component crystal oscillator Y2, capacitor C 4 ~ C8, resistance R 4 ~ R5, socket Z5 ~ Z6; Three output terminals of described oil circuit temperature sensor (5) connect 1 ~ 3 pin of Z5 respectively, between 1 ~ 3 pin of three output terminals difference combination hub Z6 of described oil tank temperature sensor (9); 1 pin of described integrated package U6 connects 1 pin of single-chip microcomputer U4, and 14 ~ 12 pin of integrated package U6 are corresponding 13 pin, 3 pin, 2 pin that meet single-chip microcomputer U4 respectively, and 5 pin of integrated package U6 connect+5V, 4 pin of integrated package U6,6 pin, 8 pin, 10 pin, 11 pin ground connection; 2 pin of described socket Z5 ~ Z6 connect 6 ~ 7 pin of integrated package U6 respectively, and 1 pin of socket Z5 ~ Z6 connects+5V, 3 pin ground connection; Described crystal oscillator Y2 is connected between 2 pin and 3 pin of integrated package U6, and capacitor C 4 is connected between 2 pin and ground of integrated package U6, and capacitor C 5 is connected between 3 pin and ground of integrated package U6; Capacitor C 6 is connected on+5V power supply and ground between, be connected on after resistance R 4 ~ R5 series connection+5V power supply and ground between, 9 pin of integrated package U6 are connected on the node of R4 and R5, are connected between the node and ground of R4 and R5 the 10 pin ground connection of integrated package U6 after capacitor C 7 ~ C8 parallel connection.
6. the temperature control system of a kind of analogue transformer standard oil sample device for formulating according to claim 5 is characterized in that described communication module is made up of bluetooth integrated package U1, USB integrated package U5 and double-point double-throw switch S1; 2 stationary contacts of described double-point double-throw switch S1 connect 10 pin, 11 pin of single-chip microcomputer U4, and the swing arm selectivity of double-point double-throw switch S1 inserts 2 ~ 3 pin of bluetooth integrated package U1 or USB integrated package U5; 1 pin of described bluetooth integrated package U1 and USB integrated package U5 all connects+5V, the equal ground connection of its 4 pin.
7. the temperature control system of a kind of analogue transformer standard oil sample device for formulating according to claim 6, it is characterized in that all flat belt-like things for being formed by thermo electric material and insulating material of described oil tank heating tape (1) and oil line pipe heater strip (3), described thermo electric material is nickel-chrome, and described insulating material is the multilayer alkali-free glass fibre; Described heat-insulation layer (8) is hard polyurethane foams.
8. the temperature control system of a kind of analogue transformer standard oil sample device for formulating according to claim 7 is characterized in that described pipe temperature sensing element device (5) and oil tank temperature sensor (9) are platinum resistance formula sensor.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103458664A (en) * | 2013-09-06 | 2013-12-18 | 重庆创思特科技有限公司 | Circulating liquid type self-sensing optimal temperature circuit board protecting device |
| CN105891834A (en) * | 2016-03-30 | 2016-08-24 | 河南师范大学 | Indoor supersonic position indicator |
| CN106241611A (en) * | 2016-08-31 | 2016-12-21 | 润邦卡哥特科工业有限公司 | A kind of hydraulic system starting protection device being applicable to worst cold case |
| CN106546686A (en) * | 2016-11-21 | 2017-03-29 | 国网山东省电力公司电力科学研究院 | A kind of device for formulating of oil dissolved gas on-line monitoring system verification standard oil |
| CN108760090A (en) * | 2018-05-28 | 2018-11-06 | 深圳友讯达科技股份有限公司 | Simulated environment temperature testing device |
| CN111038858A (en) * | 2019-09-30 | 2020-04-21 | 浩联保温管业有限公司 | Constant temperature circulation feeding system |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103458664A (en) * | 2013-09-06 | 2013-12-18 | 重庆创思特科技有限公司 | Circulating liquid type self-sensing optimal temperature circuit board protecting device |
| CN105891834A (en) * | 2016-03-30 | 2016-08-24 | 河南师范大学 | Indoor supersonic position indicator |
| CN106241611A (en) * | 2016-08-31 | 2016-12-21 | 润邦卡哥特科工业有限公司 | A kind of hydraulic system starting protection device being applicable to worst cold case |
| CN106546686A (en) * | 2016-11-21 | 2017-03-29 | 国网山东省电力公司电力科学研究院 | A kind of device for formulating of oil dissolved gas on-line monitoring system verification standard oil |
| CN106546686B (en) * | 2016-11-21 | 2019-03-01 | 国网山东省电力公司电力科学研究院 | Using the preparation method of the device for formulating of oil dissolved gas on-line monitoring system verification standard oil |
| CN108760090A (en) * | 2018-05-28 | 2018-11-06 | 深圳友讯达科技股份有限公司 | Simulated environment temperature testing device |
| CN111038858A (en) * | 2019-09-30 | 2020-04-21 | 浩联保温管业有限公司 | Constant temperature circulation feeding system |
| CN111038858B (en) * | 2019-09-30 | 2020-11-27 | 浩联保温管业有限公司 | Constant temperature circulation feeding system |
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| Publication number | Publication date |
|---|---|
| CN103197708B (en) | 2016-01-20 |
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