CN108760423B - Quantitative control device for oiled paper insulation moisture of headspace type gas-containing method - Google Patents
Quantitative control device for oiled paper insulation moisture of headspace type gas-containing method Download PDFInfo
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Abstract
The application provides a quantitative control device for oiled paper insulation moisture of a headspace type gas containing method, which comprises a box body, an inflator and a control circuit, wherein the top of the box body is provided with an opening; a first metal vent pipe is arranged on one side wall of the box body; the first metal vent pipe is sequentially provided with a first valve, a first gas flowmeter and a first humidity sensor along the gas flowing direction; a second metal vent pipe is arranged on the other side wall of the box body; the second metal vent pipe is provided with a second humidity sensor, a second gas flowmeter and a second valve in sequence along the gas flowing direction. This application adopts devices such as humidity transducer and flowmeter, realizes device input/output gas's humidity real-time supervision and flow adjustment, because the oiled paper sample is placed in insulating oil in the device to calculate through the difference of inflow gas moisture and outflow gas moisture and obtain absorptive moisture, can avoid the interference of correlation factor such as air humidity, carry out reliable accurate control to the moisture content of oiled paper sample.
Description
Technical Field
The application oil paper insulation experimental equipment field especially relates to an oil paper insulation moisture quantitative control device of headspace formula appearance gas method.
Background
The converter transformer has the functions of voltage transformation, current conversion, rectification and the like among various voltage classes, and is an important component of an extra-high voltage direct-current transmission system. The oil paper insulation system mainly comprises an insulation paper material and mineral insulation oil to ensure the operation safety. During the operation of the transformer, the aging and defects of the oil paper insulating material seriously threaten the safety of the operation of the system. The main factors causing the aging of the oiled paper and the defects of the oiled paper include an electric field, temperature, moisture, oxygen, acid components and the like. According to related researches, moisture of the oiled paper is the biggest reason for reducing the insulation reliability of the oiled paper except temperature and causing transformer accidents.
During the installation, debugging and operation of the transformer system, the oiled paper insulation inevitably absorbs moisture. The chemical reaction of cellulose also produces moisture during the aging process of the oiled paper. The stronger hydrophilic ability makes the oiled paper can adsorb the moisture that exists in the insulating system, makes it participate in various reactions in the aging process, and the formation is more moisture. The moisture plays a positive feedback role in the aging process of the oil paper insulation, so that the service life of the insulation system is greatly reduced. In addition, the moisture of the oil paper insulation can also change the conductivity of the insulation system and reduce the electrical strength of the insulation system, thereby affecting the normal operation and even damage of the transformer. Therefore, moisture content is one of the factors that must be considered in the related research of oiled paper insulation. And the preparation of the oiled paper samples with different moisture contents is a precondition for researching the influence of the moisture content on an oiled paper insulation system.
At present, the preparation of the oiled paper samples with different moisture contents is usually completed by using an oven, and in order to avoid the influence of moisture in the air on the oiled paper samples, the oven needs to be set to be in a vacuum environment. And for samples with different moisture contents, the moisture content needs to be obtained by controlling the working time of the oven. However, this operation often fails to achieve precise control of the moisture content of the sample.
Disclosure of Invention
The application provides a quantitative control device for oiled paper insulation moisture of a headspace type gas-containing method, which aims to solve the problem that samples with different moisture contents need to be obtained by controlling the working time of an oven. However, this operation often fails to achieve accurate control of the moisture content of the sample.
The application provides a quantitative control device for oiled paper insulation moisture of a headspace type gas containing method, which comprises a box body, an inflator and a control circuit, wherein the top of the box body is provided with an opening;
a sealing plate covers the opening of the box body;
a first metal vent pipe is arranged on one side wall of the box body;
one end of the first metal vent pipe extends into the box body, and the other end of the first metal vent pipe is connected with the inflator through a first plastic vent pipe;
the first metal vent pipe is sequentially provided with a first valve, a first gas flowmeter and a first humidity sensor along the gas flowing direction;
a second metal vent pipe is arranged on the other side wall of the box body;
one end of the second metal vent pipe extends into the box body;
the second metal vent pipe is sequentially provided with a second humidity sensor, a second gas flowmeter and a second valve along the gas flowing direction;
the input end of the control circuit is respectively connected with the first gas flowmeter, the first humidity sensor, the second valve and the second humidity sensor, and the output end of the control circuit is connected with the inflator;
the control circuit is used for receiving the air inlet flow rate detected by the first gas flow meter, the air outlet flow rate detected by the second gas flow meter, the air inlet humidity detected by the first humidity sensor and the air outlet humidity detected by the second humidity sensor;
calculating the mass of water absorbed by the oil-paper mixed solution according to the air inlet flow speed, the air outlet flow speed, the air inlet humidity and the air outlet humidity;
comparing the moisture mass absorbed by the oiled paper mixed solution with a preset moisture mass, and if the moisture mass absorbed by the oiled paper mixed solution is smaller than the preset moisture mass by a preset moisture mass difference, controlling the inflator to reduce a power value corresponding to the preset moisture mass difference;
and if the moisture mass absorbed by the oiled paper mixed liquid is greater than the preset moisture mass, controlling the inflator to stop working.
Furthermore, one end of the first metal vent pipe extending into the box body is provided with a gas release pipe.
Furthermore, the other end of the second metal breather pipe is provided with a gas output drying device,
the second metal vent pipe is connected with the gas output drying device through a second plastic vent pipe.
Furthermore, a PLC control panel is further arranged on the side wall of the box body, and the PLC control panel is connected with the control circuit.
Furthermore, a USB interface is further arranged on the PLC control panel.
According to the technical scheme, the application provides a quantitative control device for the oiled paper insulation moisture of a headspace type gas-containing method, a device for preparing oiled paper insulation samples with adjustable moisture content is realized, devices such as a humidity sensor and a flowmeter are adopted, real-time monitoring and flow adjustment of the humidity of input and output gas of the device are realized, and because the oiled paper samples are placed in the insulation oil in the device and the absorbed moisture is obtained through calculation of the difference value of the inflow gas moisture and the outflow gas moisture, the interference of relevant factors such as air humidity and the like can be avoided, and reliable and accurate control is performed on the moisture content of the oiled paper samples.
Drawings
In order to more clearly explain the technical solution of the present application, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious to those skilled in the art that other drawings can be obtained according to the drawings without any creative effort.
Fig. 1 is a schematic structural diagram of a quantitative oilpaper insulation moisture control device for a headspace type air-containing method.
The device comprises a sealing plate 1, a first gas flowmeter 2, a first metal vent pipe 3, a first plastic bayonet 4, a PLC control panel 5, a first plastic vent pipe 6, a gas release pipe 7, an inflator 8, a second humidity sensor 9, a second gas flowmeter 10, a second valve 11, a second metal vent pipe 12, a second plastic vent pipe 13, a gas output drying device 14, a control circuit 15, a box 16, an oil-paper mixed liquid 17, a first humidity sensor 18, a first valve 19 and a second plastic bayonet 20.
Detailed Description
Referring to fig. 1, the application provides a quantitative control device for oiled paper insulation moisture in a headspace type gas-containing method, which comprises a box body 16 with an opening at the top, an inflator 8 and a control circuit 15;
a sealing plate 1 covers an opening of the box body 16;
a first metal vent pipe 3 is arranged on one side wall of the box body 16;
one end of the first metal vent pipe 3 extends into the box body 16, and the other end of the first metal vent pipe 3 is connected with an inflator 8 through a first plastic vent pipe 6;
the first metal breather pipe 3 is sequentially provided with a first valve 19, a first gas flowmeter 2 and a first humidity sensor 18 along the gas flowing direction;
a second metal vent pipe 12 is arranged on the other side wall of the box body 16;
one end of the second metal vent pipe 12 extends into the box body 16;
the second metal vent pipe 12 is sequentially provided with a second humidity sensor 9, a second gas flowmeter 10 and a second valve 11 along the gas flowing direction;
the input end of the control circuit 15 is respectively connected with the first gas flow meter 2, the first humidity sensor 18, the second valve 11 and the second humidity sensor 9, and the output end of the control circuit 15 is connected with the inflator 8;
the control circuit 15 is used for receiving the air inlet flow rate detected by the first gas flow meter 2, the air outlet flow rate detected by the second gas flow meter 10, the air inlet humidity detected by the first humidity sensor 18 and the air outlet humidity detected by the second humidity sensor 9;
calculating the mass of water absorbed by the oilpaper mixed solution 17 according to the air inlet flow speed, the air outlet flow speed, the air inlet humidity and the air outlet humidity;
comparing the moisture mass absorbed by the oiled paper mixed solution 17 with a preset moisture mass, and if the moisture mass absorbed by the oiled paper mixed solution 17 is smaller than the preset moisture mass by a preset moisture mass difference, controlling the inflator 8 to reduce the power value corresponding to the preset moisture mass difference;
and if the moisture mass absorbed by the oiled paper mixed liquid 17 is greater than the preset moisture mass, controlling the inflator 8 to stop working.
The working principle of the embodiment is as follows: placing an oiled paper sample into a box body 16, injecting insulating oil into the box body 16 to form an oiled paper mixed solution 17, extending a first metal vent pipe 3 into the mixed solution, opening a first valve 19, a second valve 11 and an inflator 8, and receiving an air inlet flow rate detected by a first gas flowmeter 2, an air outlet flow rate detected by a second gas flowmeter 10, air inlet humidity detected by a first humidity sensor 18 and air outlet humidity detected by a second humidity sensor 9 by a control circuit 15; then, using a formula M0-v 1 p1-v2 p2, wherein M0 represents the moisture mass absorbed by the paper-oil mixture 17, v1 represents the air intake flow rate, p1 represents the air intake humidity, v2 represents the air intake flow rate, and p2 represents the air intake humidity, the moisture mass absorbed by the paper-oil mixture 17 is calculated, the obtained moisture mass absorbed by the paper-oil mixture 17 is compared with the preset moisture mass, the power rate of the inflator 8 is adjusted stepwise according to the difference between the moisture mass absorbed by the paper-oil mixture 17 and the preset moisture mass, the air intake flow rate is reduced stepwise, and the operation of the inflator 8 is automatically stopped until the preset moisture content is reached.
According to the technical scheme, the application provides a quantitative control device for the oiled paper insulation moisture of a headspace type gas-containing method, a device for preparing oiled paper insulation samples with adjustable moisture content is realized, devices such as a humidity sensor and a flowmeter are adopted, real-time monitoring and flow adjustment of the humidity of input and output gas of the device are realized, and because the oiled paper samples are placed in the insulation oil in the device and the absorbed moisture is obtained through calculation of the difference value of the inflow gas moisture and the outflow gas moisture, the interference of relevant factors such as air humidity and the like can be avoided, and reliable and accurate control is performed on the moisture content of the oiled paper samples.
Preferably, the sealing plate 1 and the box 16 are made of copper-aluminum alloy materials. The sealing plate 1 is opened and closed in a rotating mode, is provided with a handle and is provided with a sealing ring to ensure that the sealing performance of the device is good. The first metal breather pipe 3 and the first plastic breather pipe 6 can be connected through a first plastic bayonet 4, and the second metal breather pipe 12 and the second plastic breather pipe 13 are connected through a second plastic bayonet 20.
Further, one end of the first metal vent pipe 3 extending into the box body 16 is provided with a gas release pipe 7. The air release pipe 7 releases micron-sized bubbles, so that moisture in the air is easily absorbed by the oiled paper mixed solution.
Further, the other end of the second metal vent pipe 12 is provided with a gas output drying device 14,
the second metal vent pipe 12 is connected with the gas output drying device 14 through a second plastic vent pipe 13. The output air is dried, and the influence of humid air on the external environment is avoided.
Further, a PLC control panel 5 is further arranged on the side wall of the box body 16, and the PLC control panel 5 is connected with the control circuit 15. The PLC panel comprises three square buttons, a group of up-down key buttons and a liquid crystal display, is mainly made of heat-resistant plastics, can input the quality of insulating oil and paperboards which are put in, and sets the required moisture content.
Further, a USB interface is further provided on the PLC control panel 5. The USB interface can realize the transmission of data, makes things convenient for the staff to transmit relevant data.
According to the technical scheme, the application provides a quantitative control device for the oiled paper insulation moisture of a headspace type gas-containing method, a device for preparing oiled paper insulation samples with adjustable moisture content is realized, devices such as a humidity sensor and a flowmeter are adopted, real-time monitoring and flow adjustment of the humidity of input and output gas of the device are realized, and because the oiled paper samples are placed in the insulation oil in the device and the absorbed moisture is obtained through calculation of the difference value of the inflow gas moisture and the outflow gas moisture, the interference of relevant factors such as air humidity and the like can be avoided, and reliable and accurate control is performed on the moisture content of the oiled paper samples.
Claims (5)
1. A quantitative control device for oiled paper insulation moisture of a headspace type gas-containing method is characterized by comprising a box body (16) with an opening at the top, an inflator (8) and a control circuit (15);
a sealing plate (1) covers an opening of the box body (16);
a first metal vent pipe (3) is arranged on one side wall of the box body (16);
one end of the first metal vent pipe (3) extends into the box body (16), and the other end of the first metal vent pipe (3) is connected with an inflator (8) through a first plastic vent pipe (6);
the first metal breather pipe (3) is sequentially provided with a first valve (19), a first gas flowmeter (2) and a first humidity sensor (18) along the gas flowing direction;
a second metal vent pipe (12) is arranged on the other side wall of the box body (16);
one end of the second metal vent pipe (12) extends into the box body (16);
the second metal vent pipe (12) is sequentially provided with a second humidity sensor (9), a second gas flowmeter (10) and a second valve (11) along the gas flowing direction;
the input end of the control circuit (15) is respectively connected with the first gas flowmeter (2), the first humidity sensor (18), the second valve (11) and the second humidity sensor (9), and the output end of the control circuit (15) is connected with the inflator (8);
the control circuit (15) is used for receiving the air inlet flow rate detected by the first gas flow meter (2), the air outlet flow rate detected by the second gas flow meter (10), the air inlet humidity detected by the first humidity sensor (18) and the air outlet humidity detected by the second humidity sensor (9);
calculating the mass of water absorbed by the oil-paper mixed solution according to the air inlet flow speed, the air outlet flow speed, the air inlet humidity and the air outlet humidity;
comparing the moisture mass absorbed by the oiled paper mixed solution with a preset moisture mass, and if the moisture mass absorbed by the oiled paper mixed solution is smaller than the preset moisture mass by a preset moisture mass difference, controlling the inflator (8) to reduce a power value corresponding to the preset moisture mass difference;
and if the moisture mass absorbed by the oiled paper mixed liquid is greater than the preset moisture mass, controlling the aerator (8) to stop working.
2. The quantitative oilpaper insulation moisture control device of the headspace type gas containing method according to claim 1, wherein a gas release pipe (7) is provided at one end of the first metal vent pipe (3) extending into the tank body (16).
3. The quantitative oilpaper insulating moisture control device of the headspace type gas containing method according to claim 1, wherein the other end of the second metal vent pipe (12) is provided with a gas output drying device (14),
the second metal vent pipe (12) is connected with the gas output drying device (14) through a second plastic vent pipe (13).
4. The quantitative oil paper insulation moisture control device of the headspace type gas containing method according to claim 1, wherein a PLC control panel (5) is further arranged on the side wall of the box body (16), and the PLC control panel (5) is connected with the control circuit (15).
5. The quantitative oil paper insulation moisture control device of the headspace type gas containing method according to claim 4, wherein the PLC control panel (5) is further provided with a USB interface.
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| CN201810511849.3A CN108760423B (en) | 2018-05-25 | 2018-05-25 | Quantitative control device for oiled paper insulation moisture of headspace type gas-containing method |
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