CN113640412A - Online monitoring device and method for oil-immersed power transformer - Google Patents
Online monitoring device and method for oil-immersed power transformer Download PDFInfo
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Abstract
An oil-immersed power transformer on-line monitoring device and a method thereof, which comprises a sampling unit, a headspace processing unit, a gas chromatography monitoring unit and a data processing unit which are connected in sequence, wherein a sample bin is arranged in the headspace processing unit, one end of the sample bin is connected with a transformer to be monitored, the sample bin is connected with the gas chromatography monitoring unit through a transmission line, a waste oil recovery unit is connected with the sample bin and the transformer to be monitored, a control unit is electrically connected with the sampling unit, the headspace processing unit, the gas chromatography monitoring unit and the waste oil recovery unit, the control unit is in communication connection with the data processing unit, an oil sample can be automatically taken to detect the alcohol content in oil, so as to judge the insulation aging state and the residual life of oil-immersed transformer paper, simultaneously data can be recorded and analyzed, a fault alarm signal is sent, the detected waste oil can be recovered and processed, and errors caused by manual operation are avoided, the sampling danger is reduced, and the online detection and environment-friendly characteristics are realized.
Description
Technical Field
The invention relates to the field of transformer monitoring, in particular to an online monitoring device and method for an oil-immersed power transformer.
Background
In the aging and degradation process of the power transformer insulating paper, aging characteristic products such as carbon and oxygen gas, furfural, alcohols and the like are generated along with the aging characteristic products, and the aging characteristic products have strong correlation with the polymerization degree of the insulating paper.
The method for evaluating the insulation aging degree of the transformer paper by using the aging product in the oil avoids the power failure core hanging and paper taking of the transformer, and has higher practical application value. At present, the evaluation of the aging state of paper insulation by using alcohols (mainly methanol and ethanol) in oil is a latest generation evaluation method, the generation of methanol is strongly correlated with the degradation degree of the insulation paper, and ethanol can reflect the existence of hot spots in a transformer, which is an advantage that other aging characteristic products do not have.
The main method for detecting characteristic products in oil at present is to take insulating oil out of a transformer and send a sample into a laboratory for detection, and belongs to an off-line detection method. This detection method has various drawbacks: (1) alcohols belong to volatile organic compounds, and may be lost due to the influence of external environment in the sampling process; (2) time is required to be increased when the vehicle is transported to a laboratory for detection, so that the fault is not evaluated timely and accurately; (3) the requirement of field sampling on workers is high, the cooperation of a plurality of workers is possibly needed, and the situation that the sampling cannot be carried out in severe weather can occur; (4) the transformer itself is electrified, and the staff has the safety risk in the sampling process.
The online detection of the aging state of the paper insulation is realized on the basis of utilizing alcohols to evaluate the aging state of the paper insulation, so that the damage can be avoided, the fault diagnosis level of the transformer can be improved, the timeliness of finding faults is enhanced, the safety of workers is effectively protected, and the online detection method has important application value.
The transformer oil chromatographic analysis technology is an indispensable important detection item, can find internal latent faults in time according to the change of components and contents in oil, and is an important basis for judging the running state of a transformer. If the full-automatic sampling of the insulating oil and the real-time analysis of the component and content change of the insulating oil can be realized, the effectiveness of the result and the safety of workers are better ensured. The result is analyzed and fed back in time, and the fault is found and processed in time, so that the safety of the transformer is further improved, and the method plays an important role in improving the automation level of the whole power system.
Disclosure of Invention
The invention aims to provide an online monitoring device and method for an oil-immersed power transformer, which are used for monitoring the insulation of the oil-immersed power transformer on line.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
an oil-immersed power transformer on-line monitoring device comprises a sampling unit, a headspace processing unit, a gas chromatography monitoring unit and a data processing unit which are connected in sequence, wherein a sample bin is arranged in the headspace processing unit, one end of the sample bin is connected with a transformer to be monitored, the sample bin is connected with the gas chromatography monitoring unit through a transmission line, a waste oil recovery unit is connected with the sample bin and the transformer to be monitored, a control unit is electrically connected with the sampling unit, the headspace processing unit, the gas chromatography monitoring unit and the waste oil recovery unit, the control unit is in communication connection with the data processing unit, the insulating oil in the transformer to be detected is extracted to a sample bin through a sampling unit, the insulating oil in the sample bin is treated by a headspace treatment unit, then the upper layer gas enters a gas chromatography monitoring unit for chromatography monitoring, and the detection result is transmitted to the data processing unit, and the control unit judges whether to send out an alarm signal according to the content of the methanol or the ethanol.
The waste oil recovery unit comprises a blank insulating oil bin and a waste oil purification storage unit, the blank insulating oil bin is connected with the input end of the sample bin, and the waste oil purification storage unit is connected with the output end of the sample bin.
The sample bin is wrapped with an insulating layer.
The data processing unit is in communication connection with the cloud server, and the cloud server is in communication connection with the control unit.
The sample bin is connected with the transformer to be monitored through an insulating joint.
The monitoring method using the online monitoring device for the oil-immersed power transformer comprises the following specific steps:
step one, setting sample sampling volume, headspace furnace temperature, balance time, gas transmission line temperature and detection conditions of a gas chromatography monitoring unit in a control unit;
secondly, the sampling unit extracts insulating oil with a set sample sampling volume to a sample bin, and then the headspace processing unit heats the headspace of the sample bin to a set headspace furnace temperature and keeps the furnace temperature according to a set balance time;
extracting upper-layer gas of the sample bin, and sending the upper-layer gas into a gas chromatography monitoring unit through a transmission line, wherein the temperature of the transmission line is kept at a set temperature;
step four, the gas chromatography monitoring unit carries out gas chromatography detection on the gaseous sample according to set detection conditions, and the detected result is sent to the data processing unit;
step six, the data processing unit records the peak areas of methanol and ethanol in the oil and calculates the current detection content;
step seven, the data processing unit transmits the detection data to the control unit, the control unit judges whether an alarm signal is sent out or not according to the content of the methanol or the ethanol, meanwhile, the data processing unit records the data in detail and uploads the data to the cloud server to generate a trend graph, and operation and maintenance personnel can conveniently check the trend graph;
step eight, outputting the detected sampled insulating oil to a waste oil purification storage unit for purification and storage, wherein the sampled insulating oil can be added into the transformer again;
and step nine, the control unit sends an instruction to the blank insulating oil bin, the blank insulating oil bin outputs blank insulating oil to the sample bin for washing, and the washed waste oil enters the waste oil purification storage unit for purification and storage and can be added into the transformer again.
The method for calculating the content of methanol or ethanol in the sample insulating oil by the data processing unit in the sixth step comprises the following steps:
the sample cabin is a closed space, a liquid sample in the closed space can volatilize under a heating state, a gas phase part and a liquid phase part reach balance in sufficient time, the proportion of each component in the gas phase part is in a direct proportion relation with the proportion of an original sample, the original proportion of the gas phase part can be obtained by only extracting the balanced gas phase part, and the principle meets the following relational expression:
in the above formula, K represents the concentration distribution coefficient of the substance between the gas phase and the liquid phase, ClIs the concentration of the component to be measured in the liquid phase, CgThe concentration of the component to be measured in the gas phase;
meanwhile, the phase volume ratio satisfies the following formula:
in the above formula, β represents a volume distribution coefficient of a substance between a gas phase and a liquid phase, VgVolume of top air phase at equilibrium, VlVolume of liquid phase at equilibrium;
the sample bin (11) is used as a closed space, the sum of the volumes of the gas phase and the liquid phase is the volume of the sample bin (11), and the following formula is satisfied:
V＝Vl+Vg＝V0+Vg (3)
in the sample bin (11), the content of the measured component is always kept unchanged no matter how the gas phase and the liquid phase are balanced, and the following formula is satisfied:
C0V0＝C0Vl＝ClVl+CgVg (4)
substituting formula (1) into formula (4) can obtain:
C0V0＝C0Vl＝KCgVl+CgVg (5)
by modifying the formula (5), the following can be obtained:
further simplification, obtaining:
since K and beta are constants, CgAnd C0The relationship of (c) can be expressed as:
Cg＝K'C0 (9)
in the first step, the sampling volume of the sample is 10mL, the temperature of the headspace furnace is 90 ℃, the equilibrium time is 40min, and the temperature of the gas transmission line is 100 ℃.
In the first step, the gas chromatography detection conditions are as follows: : column box temperature 40 ℃, carrier gas: he gas, carrier gas flow rate 1.02mL/min, interface temperature 250.0 ℃, purge flow 3.0mL/min, chromatographic column model: VF-624ms, 60m by 0.25mm by 0.14 μm, column box temperature set to ramp from 45 ℃ (hold 10min) to about 220 ℃ (hold 30min) at a rate of 5 ℃/min.
The on-line monitoring device and method for the oil-immersed power transformer provided by the invention have the following beneficial effects: 1) the sampling automation is realized, the sampling and detection efficiency is improved, the manual participation is reduced, the safety of workers is ensured, and meanwhile, the error caused by the influence of the external environment and the manual sampling is reduced;
2) real-time monitoring is realized, and the detection time is shortened;
3) data storage is convenient for query, the change trend of products in oil can be provided, and the running state of the transformer can be conveniently predicted;
4) the device has an alarm function, and can send out an alarm signal when the content of the product exceeds a preset value;
5) the waste oil recovery function is realized, the detected waste oil enters a recovery system for degradation treatment, and the air pollution is prevented;
6) and (4) an automatic cleaning function. Automatically cleaning the detection system after each detection;
7) the remote management of a network and the analysis of big data are supported;
8) supporting various power supplies including photovoltaic panel power supply and 220V mains supply access;
9) and the oil sample detection adopts headspace treatment, so that the pollution of the sample to a detection system is avoided.
Drawings
The invention is further illustrated by the following examples in conjunction with the accompanying drawings:
FIG. 1 is a schematic diagram of a system of a detection apparatus according to the present invention;
FIG. 2 is a schematic connection diagram of the detuning control circuit;
fig. 3 is a flow chart of online monitoring.
Wherein: sampling unit 1, sample storehouse 11, heat preservation 12, headspace processing unit 2, gas chromatography monitoring unit 3, data processing unit 4, high in the clouds server 5, waste oil recovery unit 6, blank insulating oil storehouse 61, waste oil purification storage unit 62, the control unit 7.
Detailed Description
The technical scheme of the invention is explained in detail in the following by combining the drawings and the embodiment.
As shown in fig. 1-2, an oil-immersed power transformer online monitoring device comprises a sampling unit 1, a headspace processing unit 2, a gas chromatography monitoring unit 3 and a data processing unit 4 which are connected in sequence, wherein a sample bin 11 is arranged in the headspace processing unit 2, one end of the sample bin 11 is connected with a transformer to be monitored, the sample bin 11 is connected with the gas chromatography monitoring unit 3 through a transmission line, a waste oil recovery unit 6 is connected with the sample bin 11 and the transformer to be monitored, a control unit 7 is electrically connected with the sampling unit 1, the headspace processing unit 2, the gas chromatography monitoring unit 3 and the waste oil recovery unit 6, the control unit 7 is in communication connection with the data processing unit 4, insulating oil in the transformer to be detected is extracted to the sample bin 11 through the sampling unit 1, upper layer gas in the sample bin 11 enters the gas chromatography monitoring unit 3 for chromatography monitoring after the insulating oil is processed by the headspace processing unit 2, and the detection result is transmitted to the data processing unit 4, and the control unit 7 judges whether to send out an alarm signal according to the content of the methanol or the ethanol.
The waste oil recovery unit 6 comprises a blank insulating oil bin 61 and a waste oil purification storage unit 62, wherein the blank insulating oil bin 61 is connected with the input end of the sample bin 11, and the waste oil purification storage unit 62 is connected with the output end of the sample bin 11.
The sample bin 11 is wrapped with an insulating layer 12.
The working principle of the gas chromatography monitoring unit 3 is as follows: the coating stationary phase in the chromatographic column has an adsorption effect, and after each gaseous component enters the chromatographic column, the interaction force with the stationary phase is different due to different physical and chemical properties of the component, so that the time for passing through the chromatographic column is different, and different retention time peak-off time exists in a chromatogram.
After the data processing unit 4 obtains the chromatogram, the content of the detected substance is calculated, the content of the detected substance is recorded in detail and compared at each detection time, the change trend is obtained, so that the reason of the overheat fault in the transformer can be analyzed, the data processing unit 4 uploads the data to the cloud server through a communication line, the operation maintenance personnel further analyzes the data, and if the transformer needs to be maintained, the operation personnel issues a shutdown instruction to stop the operation of the transformer.
The data processing unit 4 is in communication connection with the cloud server 5, and the cloud server 5 is in communication connection with the control unit 7.
The sample bin 11 is connected with a transformer to be monitored through an insulating joint, the sample bin 11 and a transformer shell can be insulated through the insulating joint, the insulation problem during transformer monitoring is solved, the sample bin 11 is connected with the transformer shell in a non-conductor mode, the transformer mailbox shell and the sample bin 11 can serve as independent individuals, and the sample bin 11 is an uncharged part.
As shown in fig. 3, the monitoring method using the online monitoring device for the oil-immersed power transformer includes the following specific steps:
step one, setting sample sampling volume, headspace furnace temperature, balance time, gas transmission line temperature and detection conditions of a gas chromatography monitoring unit 3 in a control unit 7;
step two, the sampling unit 1 extracts 10mL of insulating oil to the sample bin 11, the temperature of the headspace furnace is kept at 90 ℃, and the balance time is kept at 40 min;
step three, extracting upper-layer gas in the sample bin 11, and sending the upper-layer gas into the gas chromatography monitoring unit 3 through a transmission line, wherein the temperature of the transmission line is kept at 100 ℃;
step four, the gas chromatography monitoring unit 3 performs gas chromatography detection on the gaseous sample, and the detection conditions are as follows:
gas chromatography conditions: column box temperature 40 ℃, carrier gas: he gas, carrier gas flow rate 1.02mL/min, interface temperature 250.0 ℃, purge flow 3.0mL/min, chromatographic column model: VF-624ms, 60m × 0.25mm × 0.14 μm, setting the temperature of the column box to be kept at 45 ℃ for 10min, increasing the temperature at the speed of 5 ℃/min to about 220 ℃ for 30min, and sending the detected result to the data processing unit 4;
step six, the data processing unit 4 records the peak areas of methanol and ethanol in the oil, and calculates the current detection content;
step seven, the data processing unit 4 transmits the detection data to the control unit 7, the control unit 7 judges whether to send an alarm signal or not according to the content of the methanol or the ethanol, meanwhile, the data processing unit 4 records the data in detail and uploads the data to the cloud server 5 to generate a trend graph, and operation and maintenance personnel can conveniently check the trend graph;
step eight, outputting the detected sampled insulating oil to a waste oil purification storage unit 62 for purification and storage, and adding the sampled insulating oil into the transformer again;
and step nine, the control unit 7 sends an instruction to the blank insulating oil bin 61, the blank insulating oil bin 61 outputs blank insulating oil to the sample bin 11 for washing, and the washed waste oil enters the waste oil purification storage unit 62 for purification and storage and can be added into the transformer again.
The method for calculating the content of methanol or ethanol in the sample insulating oil by the data processing unit 4 in the sixth step comprises the following steps:
the sample cabin 11 is a closed space, the liquid sample in the closed space can volatilize under the heating state, the gas phase part and the liquid phase part reach balance in sufficient time, the proportion of each component in the gas phase part is in a direct proportion relation with the proportion of the original sample, the original proportion can be obtained by only extracting the balanced gas phase part, and the principle meets the following relational expression:
in the above formula, K represents the concentration distribution coefficient of the substance between the gas phase and the liquid phase, ClIs the concentration of the component to be measured in the liquid phase, CgThe concentration of the component to be measured in the gas phase;
meanwhile, the phase volume ratio satisfies the following formula:
in the above formula, β represents a volume distribution coefficient of a substance between a gas phase and a liquid phase, VgVolume of top air phase at equilibrium, VlVolume of liquid phase at equilibrium;
the sample bin (11) is used as a closed space, the sum of the volumes of the gas phase and the liquid phase is the volume of the sample bin (11), and the following formula is satisfied:
V＝Vl+Vg＝V0+Vg (3)
in the sample bin (11), the content of the measured component is always kept unchanged no matter how the gas phase and the liquid phase are balanced, and the following formula is satisfied:
C0V0＝C0Vl＝ClVl+CgVg (4)
substituting formula (1) into formula (4) can obtain:
C0V0＝C0Vl＝KCgVl+CgVg (5)
by modifying the formula (5), the following can be obtained:
further simplification, obtaining:
since K and beta are constants, CgAnd C0The relationship of (c) can be expressed as:
Cg＝K'C0 (9)。
Claims (9)
1. an oil-immersed power transformer on-line monitoring device is characterized by comprising a sampling unit (1), a headspace processing unit (2), a gas chromatography monitoring unit (3) and a data processing unit (4) which are sequentially connected, wherein a sample bin (11) is arranged in the headspace processing unit (2), one end of the sample bin (11) is connected with a transformer to be monitored, the sample bin (11) is connected with the gas chromatography monitoring unit (3) through a transmission line, a waste oil recovery unit (6) is connected with the sample bin (11) and the transformer to be monitored, a control unit (7) is electrically connected with the sampling unit (1), the headspace processing unit (2), the gas chromatography monitoring unit (3) and a waste oil recovery unit (6), the control unit (7) is in communication connection with the data processing unit (4), and insulating oil in the transformer to be detected is extracted to the sample bin (11) through the sampling unit (1), after the insulating oil in the sample bin (11) is processed by the headspace processing unit (2), the upper layer gas enters the gas chromatography monitoring unit (3) for chromatography monitoring, and the detection result is transmitted to the data processing unit (4), and the control unit (7) judges whether to send out an alarm signal according to the content of methanol or ethanol.
2. The oil-immersed power transformer online monitoring device according to claim 1, wherein the waste oil recovery unit (6) comprises a blank insulating oil bin (61) and a waste oil purification storage unit (62), the blank insulating oil bin (61) is connected with an input end of the sample bin (11), and the waste oil purification storage unit (62) is connected with an output end of the sample bin (11).
3. The oil-immersed power transformer online monitoring device according to claim 2, characterized in that the sample chamber (11) is wrapped with an insulating layer (12).
4. An oil-immersed power transformer online monitoring device according to claim 3, characterized in that the data processing unit (4) is in communication connection with the cloud server (5), and the cloud server (5) is in communication connection with the control unit (7).
5. An oil-filled power transformer online monitoring device according to claim 3, characterized in that the sample chamber (11) is connected with the transformer to be monitored through an insulated joint.
6. The method for monitoring the oil-immersed power transformer online monitoring device according to claim 5, is characterized in that the specific steps of monitoring are as follows:
step one, setting sample sampling volume, headspace furnace temperature, balance time, gas transmission line temperature and detection conditions of a gas chromatography monitoring unit (3) in a control unit (7);
step two, the sampling unit (1) extracts insulating oil with a set sample sampling volume to a sample bin (11), and then the headspace processing unit (2) heats the headspace of the sample bin (11) to a set headspace furnace temperature and keeps the furnace temperature according to a set balance time;
extracting upper-layer gas in the sample bin (11), and sending the upper-layer gas into the gas chromatography monitoring unit (3) through a transmission line, wherein the temperature of the transmission line is kept at a set temperature;
step four, the gas chromatography monitoring unit (3) performs gas chromatography detection on the gaseous sample according to set detection conditions, and the detected result is sent to the data processing unit (4);
step six, the data processing unit (4) records the peak areas of methanol and ethanol in the oil, and calculates the current detection content;
step seven, the data processing unit (4) transmits the detection data to the control unit (7), the control unit (7) judges whether to send an alarm signal or not according to the content of methanol or ethanol, meanwhile, the data processing unit (4) records the data in detail and uploads the data to the cloud server (5) to generate a trend graph, and operation and maintenance personnel can conveniently check the trend graph;
step eight, outputting the detected sampled insulating oil to a waste oil purification storage unit (62) for purification and storage, wherein the sampled insulating oil can be added into the transformer again;
and ninthly, the control unit (7) sends an instruction to the blank insulating oil bin (61), the blank insulating oil bin (61) outputs blank insulating oil to the sample bin (11) for washing, and the washed waste oil enters the waste oil purification storage unit (62) for purification and storage and can be added into the transformer again.
7. The oil-immersed power transformer online monitoring method according to claim 6, wherein the method for calculating the content of methanol or ethanol in the sample insulating oil by the data processing unit (4) in the sixth step comprises the following steps:
the sample cabin (11) is a closed space, a liquid sample in the closed space can volatilize under a heating state, a gas phase part and a liquid phase part reach balance in sufficient time, the proportion of each component in the gas phase part is in a direct proportion relation with the proportion of the original sample, the original proportion can be obtained by only extracting the balanced gas phase part, and the principle meets the following relational expression:
in the above formula, K represents the concentration distribution coefficient of the substance between the gas phase and the liquid phase, ClIs the concentration of the component to be measured in the liquid phase, CgThe concentration of the component to be measured in the gas phase;
meanwhile, the phase volume ratio satisfies the following formula:
in the above formula, β represents a volume distribution coefficient of a substance between a gas phase and a liquid phase, VgVolume of top air phase at equilibrium, VlVolume of liquid phase at equilibrium;
the sample bin (11) is used as a closed space, the sum of the volumes of the gas phase and the liquid phase is the volume of the sample bin (11), and the following formula is satisfied:
V＝Vl+Vg＝V0+Vg (3)
in the sample bin (11), the content of the measured component is always kept unchanged no matter how the gas phase and the liquid phase are balanced, and the following formula is satisfied:
C0V0＝C0Vl＝ClVl+CgVg (4)
substituting formula (1) into formula (4) can obtain:
C0V0＝C0Vl＝KCgVl+CgVg (5)
by modifying the formula (5), the following can be obtained:
further simplification, obtaining:
since K and beta are constants, CgAnd C0The relationship of (c) can be expressed as:
Cg＝K'C0 (9)。
8. the oil-immersed power transformer online monitoring method according to claim 6, characterized in that in the first step, the sample volume is 10mL, the headspace furnace temperature is 90 ℃, the equilibrium time is 40min, and the gas transmission line temperature is 100 ℃.
9. The oil-filled power transformer online monitoring method according to claim 6, characterized in that in the first step, the gas chromatography detection conditions are as follows: : column box temperature 40 ℃, carrier gas: he gas, carrier gas flow rate 1.02mL/min, interface temperature 250.0 ℃, purge flow 3.0mL/min, chromatographic column model: VF-624ms, 60m by 0.25mm by 0.14 μm, column box temperature set to ramp from 45 ℃ (hold 10min) to about 220 ℃ (hold 30min) at a rate of 5 ℃/min.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114236102A (en) * | 2021-12-16 | 2022-03-25 | 扬州海通电子科技有限公司 | Method and device for monitoring real-time state of electric slip ring |
| CN114295737A (en) * | 2021-12-07 | 2022-04-08 | 山东和兑智能科技有限公司 | Transformer oil chromatographic analysis fault diagnosis method and device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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