CN112858806A - Online pulse taking diagnosis system and method for gas in transformer oil - Google Patents
Online pulse taking diagnosis system and method for gas in transformer oil Download PDFInfo
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- CN112858806A CN112858806A CN202011612340.1A CN202011612340A CN112858806A CN 112858806 A CN112858806 A CN 112858806A CN 202011612340 A CN202011612340 A CN 202011612340A CN 112858806 A CN112858806 A CN 112858806A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1209—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing using acoustic measurements
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1218—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing using optical methods; using charged particle, e.g. electron, beams or X-rays
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/20—Preparation of articles or specimens to facilitate testing
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Abstract
The invention discloses a transformer oil gas on-line pulse taking diagnosis system and method. An on-line pulse taking diagnosis system for gas in transformer oil comprises: the gas-oil separation unit is used for extracting dissolved gas in the transformer by adopting a vacuum degassing method and conveying the dissolved gas into the gas collection bottle; the gas detection unit is used for detecting the types of gases in the dissolved gas, the contents of different types of gases, the trace moisture content and the hydrogen concentration value in the mineral oil and sending the detection result to the industrial personal computer; and the industrial personal computer is used for receiving the detection information sent by the gas detection unit and judging the operation quality, the fault category and the fault severity of the power equipment according to the detection information. The invention can check the running state of the transformer at any time, greatly saves manpower and material resources, has high detection precision and reduces the power failure overhaul frequency of the transformer.
Description
Technical Field
The invention relates to the technical field of on-line monitoring of electrical equipment, in particular to a system and a method for on-line pulse taking diagnosis of gas in transformer oil.
Background
The power is the power of modern civilization, all the industries have no development to the power system, the requirements on power supply systems such as a transmission transformer and a traction transformer are very high, and the detection and maintenance tasks of the traction transformer and the transmission transformer are extremely important, so that the oil-gas analysis is required to be carried out on line in the fault detection test of the traction transformer; the long-chain organic molecules in the transformer oil (long-term operation, equipment aging and partial discharge) which has the effects of insulation, heat dissipation, arc extinction and the like are degraded into small-molecule organic gases such as H2, CH4, C2H4 and the like, and are dissolved in the insulating oil. Different transformation fault modes and different stages of the same fault generate different energies, and the insulating oil is decomposed into different gases under the different energies, wherein the gases are generally characterized by H2, CH4, C2H6, C2H4, C2H2, CO2 and the like. Insulation defects and other latent faults inside the transformer can be discovered early by periodically analyzing the gas components, the content and the gas production rate dissolved in the transformer during operation.
At present, the oil-gas detection method of the general transformer, such as a gas chromatography method, a gas sensor method, a Fourier infrared spectroscopy method and the like, but the methods have the defects of complex sampling, carrier gas consumption, cross sensitivity, poor long-term stability, incomplete gas component detection, difficult realization of continuous measurement and the like in long-term use.
In order to solve the problem that power enterprises are forced to be confronted by intense market competition, such as how to improve reliability, how to effectively control maintenance cost, reasonably prolong service life of equipment and the like, the condition maintenance of electrical equipment, particularly transformers, is inevitable.
Disclosure of Invention
The invention aims to provide a system and a method for diagnosing on-line pulse taking of gas in transformer oil.
In order to achieve the above object, the present invention employs the following:
an on-line pulse taking diagnosis system for gas in transformer oil comprises an oil-gas separation unit, a gas collecting bottle, a gas detection unit and an industrial personal computer, wherein,
the oil-gas separation unit is connected with the transformer and used for extracting dissolved gas in the transformer by adopting a vacuum degassing method and conveying the dissolved gas into the gas collection bottle;
the gas detection unit comprises a photoacoustic spectrometry tester, a hydrogen detection device and a micro-water detection device, wherein,
the photoacoustic spectrum tester is connected with the gas collecting bottle and used for detecting the types of gases in the dissolved gas and the contents of different gases and sending the detection result to the industrial personal computer;
the hydrogen detection device is arranged between the transformer and the oil-gas separation unit, is directly contacted with mineral oil in the transformer, and is used for collecting a hydrogen concentration value in the mineral oil and sending the hydrogen concentration value to the industrial personal computer;
the micro-water detection device is arranged between the transformer and the oil-gas separation unit, is directly contacted with mineral oil in the transformer, is used for collecting the trace moisture content in the mineral oil and sends the trace moisture content to the industrial personal computer;
and the industrial personal computer is used for receiving the detection information sent by the gas detection unit and judging the operation quality, the fault category and the fault severity of the power equipment according to the detection information.
Preferably, the photoacoustic spectrometry tester is DKG-200F, and gas detection is performed by adopting a cantilever beam optical microphone technology.
Preferably, the industrial personal computer compares the detection information with a preset threshold value in real time, and if the detection information exceeds the preset threshold value, an alarm is given out.
Preferably, the photoacoustic spectrum tester is in communication connection with the industrial personal computer through a TCP/IP network.
Preferably, the hydrogen detection device and the micro-water detection device are in communication connection with an industrial personal computer through an R485 bus.
Preferably, the system further comprises a cloud server and a user terminal, wherein the cloud server is in communication connection with an industrial personal computer and the user terminal, the industrial personal computer transmits received detection data information to the cloud server, and the user terminal can access the cloud server to acquire the detection data information.
Preferably, the user terminal includes a PC user terminal, a tablet computer user terminal, and a mobile phone user terminal.
An on-line pulse taking diagnosis method for gas in transformer oil comprises the following steps:
extracting dissolved gas in the transformer by using a vacuum degassing method;
sending the dissolved gas into a photoacoustic spectrometry gas analyzer, and measuring the dissolved gas by adopting a photoacoustic spectrometry cantilever beam technology to obtain the types of gases contained in the dissolved gas and the concentration values of various gases;
a micro-water sensor and an alloy hydrogen sensor arranged at the oil inlet are directly contacted with mineral oil in the transformer, and trace water content and hydrogen concentration values in the mineral oil are respectively collected;
and judging the operation quality, the fault category and the fault severity of the power equipment in real time according to the detection information trace moisture and hydrogen concentration values in the mineral oil in the dissolved gas.
Preferably, the photoacoustic spectrometry tester is provided with a device model of DKG-200F.
The invention has the following advantages:
1) the invention adopts the vacuum quantitative method to separate oil gas, has high degassing rate and short degassing time, and can be repeatedly used;
2) the oil circuit connecting part adopts micro water and hydrogen in-situ collection, and directly contacts gas components in oil to monitor the content of the micro water and the concentration value of the hydrogen;
3) the photoacoustic spectroscopy system adopts an efficient dynamic headspace method for degassing, needs few oil samples, has short degassing time, can achieve dynamic balance in a short time, can set the shortest measurement period to 1 hour and 1 time, and can realize online detection to the greatest extent;
4) data remote transmission, direct cell-phone and computer can remote operation monitoring, and through remote operation, need not artifical on duty, the real-time is high.
Drawings
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.
FIG. 1 is a schematic structural diagram of an on-line pulse taking diagnosis system for transformer oil gas of the present invention,
in the figures, the various reference numbers are:
the system comprises a 1-oil-gas separation unit, a 2-gas collecting bottle, a 3-photoacoustic spectrometry tester, a 4-hydrogen detection device, a 5-micro-water detection device, a 6-industrial personal computer, a 7-cloud server, an 8-user terminal, a 801-PC user terminal, an 802-tablet computer user terminal and a 803-mobile phone user terminal.
Detailed Description
In order to more clearly illustrate the invention, the invention is further described below in connection with preferred embodiments. It is to be understood by persons skilled in the art that the following detailed description is illustrative and not restrictive, and is not to be taken as limiting the scope of the invention.
In the description of the present invention, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
As shown in figure 1, the invention relates to a transformer oil gas on-line pulse taking diagnosis system, which adopts an oil gas dissolved oxygen analysis device integrating a vacuum degassing method and photoacoustic and optoacoustic fusion, and specifically comprises an oil-gas separation unit 1, a gas collecting bottle 2, a gas detection unit and an industrial personal computer 6,
the oil-gas separation unit 1 is connected with the transformer by adopting a device model DK-200FG, is used for extracting dissolved gas in the transformer by adopting a vacuum degassing method and conveying the dissolved gas into the gas collecting bottle 2, the degassing efficiency is not influenced by the external environment temperature, more fault gas is removed from an oil sample, the gas quantity entering a rear-end gas detection unit is large, and the detection precision of the device is improved;
the gas detection unit comprises a photoacoustic spectrum tester 3, a hydrogen detection device 4 and a micro-water detection device 5, wherein the photoacoustic spectrum tester 3 adopts a device model DKG-200F of Beijing Duke Tech technologies, Inc., is connected with the gas collecting bottle 2, adopts a cantilever beam optical microphone technology to detect gas, and generates characteristic light of gas absorption spectrum when an infrared light source passes through a specific narrow-band filter based on photoacoustic effect, the characteristic light is emitted into a photoacoustic gas cell, and the detected gas generates thermal expansion after absorbing the characteristic light; and regularly modulating the frequency of incident light, regularly thermally expanding the sealed photoacoustic gas cell to generate sound signals, and acquiring the intensity of the sound signals through a microphone to know the concentration value of the gas to be detected. The photoacoustic spectrum tester 3 sends the detection result to the industrial personal computer 6 through the TCP/IP network; the device MODEL of the hydrogen detection device 4 is a DK-MODEL3100 sensor, the device MODEL is arranged between the transformer and the oil-gas separation unit 1, the device MODEL is directly contacted with mineral oil in the transformer, and the device MODEL is used for collecting a hydrogen concentration value in the mineral oil and sending the hydrogen concentration value to the industrial personal computer 6 through an R485 bus; the micro-water detection device 5 is provided with a DK-MT300 sensor in the model number, is arranged between the transformer and the oil-gas separation unit 1 unit, is directly contacted with the mineral oil in the transformer, is used for collecting the trace moisture content in the mineral oil and sends the trace moisture content to the industrial personal computer 6 through an R485 bus;
the industrial personal computer 6 runs the linux embedded operating system by adopting an industrial mainboard based on an ARM chip and is used for receiving detection information sent by the gas detection unit and judging the running quality, the fault category and the fault severity of the power equipment according to the detection information, the industrial personal computer 6 compares the detection information with a preset threshold value, and if the detection information exceeds the preset threshold value, an alarm is sent.
Dispose and carry out communication connection at transformer substation's monitor or farther local cloud end server 7 through industrial computer 6 and user terminal 8 respectively in the network, industrial computer 6 transmits the detection data information who receives to cloud end server 7, and user terminal 8 includes PC user terminal 801, panel computer user terminal 802 and cell-phone user terminal 803, and user terminal 8's main function is as follows: 1. displaying the running state of the transformer: the real-time content of various gases in the transformer insulating oil of the state display interface can be displayed in the current data display module, can be visually checked, and displays the current running state; 2. receiving an alarm: the local industrial personal computer 6 receives the alarm value and transmits the alarm value to the alarm, and the PC user terminal 801, the tablet personal computer user terminal 802 and the mobile phone user terminal 803 can receive alarm data at the same time. The cloud server 7 mainly completes communication management, data collection, data processing and storage of the terminal device; the functions of inquiring and displaying data, setting attention value threshold values and analyzing and diagnosing; and upload the related data to the bureau management system
The on-line pulse taking diagnosis system based on the transformer oil gas has the working method that:
1. the oil-gas separation unit 1 is connected with a transformer, and dissolved gas in the transformer is extracted by using a vacuum degassing method;
2. dissolved gas is sent into a photoacoustic spectrum gas analyzer 3, a laser beam in a closed monitoring chamber irradiates a modulation disc which rotates at a constant speed to modulate a light source into a flickering alternating signal, a single group of optical filters on the modulation disc realize light splitting, one optical filter allows a narrow-band spectrum to penetrate, and the central frequency of the optical filter corresponds to the characteristic absorption frequency of each preselected gas; monitoring gas components in the cavity, wherein after light beams are irradiated, the gas temperature is increased to generate proportional pressure waves, so that the vibration of the cantilever beam is realized, sound signals are absorbed by the MIC sensor and the intensity is detected, and the gas types contained in the dissolved gas and the concentration values of various gases are obtained through related calculation;
3. a micro-water sensor and an alloy hydrogen sensor arranged at the oil inlet are directly contacted with mineral oil in the transformer, and trace water content and hydrogen concentration values in the mineral oil are respectively collected;
4. the industrial personal computer 6 judges the operation quality, the fault type and the fault severity of the power equipment in real time according to the concentration values of trace moisture and hydrogen in the detection information mineral oil in the dissolved gas, compares the detection information with a preset threshold value in real time, and gives an alarm if the detection information exceeds the preset threshold value.
According to the national calibration value: the preset alarm threshold values of the transformers in different grades are different, and are shown in the following table:
in-service equipment oil dissolved gas content attention value mu L/L
Obviously, the above examples are only examples for clearly illustrating the present invention and are not intended to limit the embodiments of the present invention, and it is obvious for a person skilled in the art to make other variations or modifications based on the above descriptions, and not to exhaust all embodiments, and all obvious variations or modifications that are included in the technical solutions of the present invention are still within the scope of the present invention.
Claims (9)
1. A transformer oil gas on-line pulse taking diagnosis system is characterized by comprising an oil-gas separation unit, a gas collecting bottle, a gas detection unit and an industrial personal computer, wherein,
the oil-gas separation unit is connected with the transformer and used for extracting dissolved gas in the transformer by adopting a vacuum degassing method and conveying the dissolved gas into the gas collection bottle;
the gas detection unit comprises a photoacoustic spectrometry tester, a hydrogen detection device and a micro-water detection device, wherein,
the photoacoustic spectrum tester is connected with the gas collecting bottle and used for detecting the types of gases in the dissolved gas and the contents of different gases and sending the detection result to the industrial personal computer;
the hydrogen detection device is arranged between the transformer and the oil-gas separation unit, is directly contacted with mineral oil in the transformer, and is used for collecting a hydrogen concentration value in the mineral oil and sending the hydrogen concentration value to the industrial personal computer;
the micro-water detection device is arranged between the transformer and the oil-gas separation unit, is directly contacted with mineral oil in the transformer, is used for collecting the trace moisture content in the mineral oil and sends the trace moisture content to the industrial personal computer;
and the industrial personal computer is used for receiving the detection information sent by the gas detection unit and judging the operation quality, the fault category and the fault severity of the power equipment according to the detection information.
2. The on-line pulse taking diagnosis system for gas in transformer oil as claimed in claim 1, wherein the photoacoustic spectrometry tester has a device model of DKG-200F, and gas detection is performed by using cantilever beam optical microphone technology.
3. The on-line pulse taking diagnosis system for transformer oil gas as claimed in claim 1, wherein the industrial personal computer compares the detection information with a preset threshold value in real time, and sends an alarm if the detection information exceeds the preset threshold value.
4. The on-line pulse taking diagnosis system for transformer oil gas as claimed in claim 1, wherein the photoacoustic spectrometry tester is in communication connection with an industrial personal computer through a TCP/IP network.
5. The on-line pulse taking diagnosis system for transformer oil gas as claimed in claim 1, wherein the hydrogen detection device and the micro water detection device are both in communication connection with an industrial personal computer through an R485 bus.
6. The on-line pulse taking diagnosis system for transformer oil gas in claim 1, further comprising a cloud server and a user terminal, wherein the cloud server is in communication connection with an industrial personal computer and the user terminal, the industrial personal computer transmits received detection data information to the cloud server, and the user terminal can access the cloud server to obtain the detection data information.
7. The on-line pulse taking diagnosis system for transformer oil gas in claim 6, wherein the user terminal comprises a PC user terminal, a tablet computer user terminal and a mobile phone user terminal.
8. A detection method of a transformer oil gas on-line pulse taking diagnosis system is characterized by comprising the following steps:
extracting dissolved gas in the transformer by using a vacuum degassing method;
sending the dissolved gas into a photoacoustic spectrometry gas analyzer, and measuring the dissolved gas by adopting a photoacoustic spectrometry cantilever beam technology to obtain the types of gases contained in the dissolved gas and the concentration values of various gases;
a micro-water sensor and an alloy hydrogen sensor arranged at the oil inlet are directly contacted with mineral oil in the transformer, and trace water content and hydrogen concentration values in the mineral oil are respectively collected;
and judging the operation quality, the fault category and the fault severity of the power equipment in real time according to the detection information trace moisture and hydrogen concentration values in the mineral oil in the dissolved gas.
9. The detection method according to claim 8, wherein the photoacoustic spectrometry instrument has a device model of DKG-200F.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114324238A (en) * | 2021-12-30 | 2022-04-12 | 深圳市林科电气发展有限公司 | Gas detection device and detection method for direct-connected transformer oil |
| CN114609046A (en) * | 2022-04-20 | 2022-06-10 | 江苏国电南自海吉科技有限公司 | High-precision photoacoustic spectrum monitoring method for gas in transformer oil |
| CN115267614A (en) * | 2022-06-02 | 2022-11-01 | 汇网电气有限公司 | Detection method and system for intelligent transformer |
| CN115656352A (en) * | 2022-09-07 | 2023-01-31 | 浙江日新电气有限公司 | Oil chromatography online monitoring system and monitoring method |
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