CN110849413A - Oil-immersed transformer monitoring system - Google Patents
Oil-immersed transformer monitoring system Download PDFInfo
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- CN110849413A CN110849413A CN201911018666.9A CN201911018666A CN110849413A CN 110849413 A CN110849413 A CN 110849413A CN 201911018666 A CN201911018666 A CN 201911018666A CN 110849413 A CN110849413 A CN 110849413A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D21/00—Measuring or testing not otherwise provided for
- G01D21/02—Measuring two or more variables by means not covered by a single other subclass
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
- G05B19/0423—Input/output
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- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B21/00—Alarms responsive to a single specified undesired or abnormal condition and not otherwise provided for
- G08B21/18—Status alarms
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- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B3/00—Audible signalling systems; Audible personal calling systems
- G08B3/10—Audible signalling systems; Audible personal calling systems using electric transmission; using electromagnetic transmission
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- G—PHYSICS
- G08—SIGNALLING
- G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
- G08C19/00—Electric signal transmission systems
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
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- Automation & Control Theory (AREA)
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- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Power Engineering (AREA)
- Housings And Mounting Of Transformers (AREA)
Abstract
The invention provides an oil-immersed transformer monitoring system which comprises an information acquisition unit, a central processing unit, an execution unit, a power supply unit, an alarm unit, a communication unit and a mobile terminal, wherein the information acquisition unit, the execution unit, the power supply unit, the communication unit and the central processing unit are all electrically connected, the mobile terminal is electrically connected with the central processing unit through the communication unit, the oil-immersed transformer is further comprised, the information acquisition unit is used for acquiring running state data information of the oil-immersed transformer and transmitting the data information to the central processing unit for data analysis and processing, the alarm unit is controlled to give an alarm, the execution unit is used for executing corresponding commands, and the communication unit is used for realizing data intercommunication between the central processing unit and the mobile terminal. The invention can alarm and emergency operate the transformer fault in time, and is convenient for users to check in time.
Description
Technical Field
The invention relates to the technical field of transformer monitoring, in particular to an oil-immersed transformer monitoring system.
Background
The intelligent online monitoring and early warning of the transformer substation oil-immersed transformer is significant to a power system, and the safe operation of the transformer equipment is greatly improved through the online monitoring and early warning of the transformer substation oil-immersed transformer. At present, because the main transformer equipment of the transformer substation which is in operation can not be detected on line in real time, basically, the main transformer equipment is out of order and is maintained and repaired, the power supply quality is influenced, and the damage rate of the equipment is increased. In addition, if promote comprehensively and adapt to the transformation of transformer substation owner intelligence on-line monitoring early warning, how reduce cost also is crucial problem.
Because the power supply often can appear exchanging input unstability, output voltage current abnormity and inside device temperature circumstances such as too high, after exchanging high voltage and being converted into direct current low pressure, need set up energy output limiting circuit, guarantee can in time cut off output when the circumstances such as output short circuit, overload, excessive pressure appear. On one hand, the danger generated when the power supply output is abnormal can be avoided; on the other hand, the circuit can also be used as a buffer circuit of a load, and when the power supply has the fault, the load equipment can be protected in time. However, in practical application, no matter any one or more of the fault conditions such as overvoltage, short circuit and overcurrent occurs, the phenomenon shown by the power supply is output power failure, and fault removal and maintenance are very inconvenient. Often, the power supply also does not have functions such as fault early warning, and the staff can not be informed in time to maintain when a fault occurs, so that the production progress is influenced. In addition, the power supply only has output protection, and when input abnormality occurs, power failure is also easily caused. In summary, a system for real-time monitoring and fault control of power supplies is needed.
Disclosure of Invention
In view of the above, the present invention provides a monitoring system for an oil-immersed transformer.
In order to solve the technical problems, the invention adopts the technical scheme that: an oil-immersed transformer monitoring system comprises an information acquisition unit, a central processing unit, an execution unit, a power supply unit, an alarm unit, a communication unit and a mobile terminal, wherein the information acquisition unit, the execution unit, the power supply unit, the communication unit and the central processing unit are electrically connected, and the mobile terminal is electrically connected with the central processing unit through the communication unit; the oil-immersed transformer is characterized by further comprising an oil-immersed transformer, the information acquisition unit is used for acquiring running state data information of the oil-immersed transformer and transmitting the data information to the central processing unit for data analysis and processing, the central processing unit is used for comparing and judging a measured value acquired by the information acquisition unit with a system preset value, if the measured value exceeds the preset value, the central processing unit controls the execution unit to execute a corresponding operation instruction, meanwhile, the central processing unit controls the alarm unit to give an alarm, the execution unit is used for executing a corresponding command, and the communication unit is used for achieving data intercommunication between the central processing unit and the mobile terminal.
In the present invention, preferably, the oil-immersed transformer includes a transformer body, a low-voltage bushing disposed on the top of the transformer body, and a high-voltage bushing disposed on the top of the transformer body, the central processing unit is wired into the transformer body through the high-voltage bushing, and the power supply unit is wired into the transformer body through the low-voltage bushing.
In the present invention, preferably, the execution unit includes a switch valve unit and a temperature control unit, the switch valve unit is configured to control on/off of an internal passage of the oil-immersed transformer, and the temperature control unit is configured to cool the inside of the oil-immersed transformer to a temperature value below a preset temperature value.
In the present invention, preferably, the information collecting unit includes an infrared temperature measuring sensor, a pressure sensor and a liquid level sensor, the infrared temperature measuring sensor is configured to collect temperature data in the oil-immersed transformer, the pressure sensor is configured to collect oil pressure of an oil tank of the oil-immersed transformer, and the liquid level sensor is configured to collect a liquid level height of the oil tank of the oil-immersed transformer.
In the present invention, preferably, the power supply unit is configured to convert an AC mains supply into a high voltage DC power, the power supply unit is sequentially configured to include an input filter, a rectifier, a capacitor filter, an AC-DC converter, an output filter, and a protection circuit, an input end of the input filter is connected to the AC mains supply, an output end of the input filter is electrically connected to an input end of the rectifier, an output end of the rectifier is electrically connected to an input end of the capacitor filter, an output end of the capacitor filter is electrically connected to an input end of the AC-DC converter, an output end of the AC-DC converter is electrically connected to an input end of the output filter, an output end of the output filter outputs the high voltage DC power, and the protection circuit is electrically connected to the AC-DC.
In the present invention, preferably, the central processing unit includes a single chip microcomputer, a relay module, a photoelectric isolation module and a USB interface module, the single chip microcomputer adopts a 51-series single chip microcomputer for receiving signals, completing data analysis and processing, and issuing an operation instruction, the relay module functions as an electronic switch, the photoelectric isolation module is used for completing conversion from electrical signals to optical signals and then to electrical signals, so as to reduce interference generated by the action of the relay module, and the USB interface module is used for realizing signal communication transmission between the central processing unit and the mobile terminal.
In the present invention, preferably, the communication unit uses RS232 and RS485 to implement data transmission between the central processing unit and the mobile terminal.
In the present invention, preferably, the temperature control unit is configured as an air cooling device, and the air cooling device is fixedly installed inside the oil-immersed transformer.
In the present invention, preferably, the alarm unit is provided as a buzzer.
In the present invention, preferably, the mobile terminal is a PC.
The invention has the advantages and positive effects that:
(1) through with power supply unit via low voltage bushing wiring to the inside of transformer body, power supply unit includes input filter, rectifier, capacitive filter, AC-DC converter, output filter and protection circuit, and power supply unit can change alternating current commercial power into high-voltage direct current output smoothly, has small, efficient, the stable advantage of output voltage.
(2) Through mutually supporting between singlechip, relay module, optoelectronic isolation module and the USB interface module, the singlechip is used for receiving the signal and accomplishes data analysis and processing to send operating instruction, the relay module plays electronic switch's effect, thereby the optoelectronic isolation module is used for accomplishing the conversion of the signal of telecommunication to the light signal to the signal of telecommunication again reduces because the interference that the relay module action produced, USB interface module be used for realizing central processing unit with signal communication transmission between the mobile terminal for data transmission is more convenient high-efficient, improves the interference killing feature.
(3) Through the mutual cooperation between the information acquisition unit, the central processing unit, the execution unit, the power supply unit, the alarm unit, communication unit and the mobile terminal, the information acquisition unit is used for gathering oil-immersed transformer's running state data information, and transmit this data information for central processing unit and carry out data analysis and processing, central processing unit can compare running state data information central processing unit predetermined numerical value, control alarm unit carries out the buzzer warning, in time feed back to the user through mobile terminal, so that in time carry out real-time supervision and look over to oil-immersed transformer current operating condition.
Drawings
FIG. 1 is an overall structural diagram of an oil-immersed transformer monitoring system according to the present invention;
fig. 2 is a schematic diagram of an oil-immersed transformer monitoring system according to the present invention;
FIG. 3 is a circuit block diagram of a power supply unit of an oil-immersed transformer monitoring system according to the present invention;
in the figure: 1-an information acquisition unit; 2-a central processing unit; 3-an execution unit; 4-a power supply unit; 5-an alarm unit; 6-a communication unit; 7-a mobile terminal; 8-oil-immersed transformers; 9-a transformer body; 10-a low-pressure bushing; 11-a high voltage bushing; 12-a switching valve unit; 13-a temperature control unit; 14-infrared temperature measuring sensor; 15-a pressure sensor; 16-a liquid level sensor; 17-an input filter; 18-a rectifier; 19-a capacitive filter; a 20-AC-DC converter; 21-an output filter; 22-a protection circuit; 23-a single chip microcomputer; 24-a relay module; 25-a photoelectric isolation module; 26-USB interface module.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When a component is referred to as being "connected" to another component, it can be directly connected to the other component or intervening components may also be present. When a component is referred to as being "disposed on" another component, it can be directly on the other component or intervening components may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
As shown in fig. 1 to 3, the present invention provides an oil-immersed transformer monitoring system, which includes an information acquisition unit 1, a central processing unit 2, an execution unit 3, a power supply unit 4, an alarm unit 5, a communication unit 6, and a mobile terminal 7, wherein the information acquisition unit 1, the execution unit 3, the power supply unit 4, the communication unit 5, and the central processing unit 2 are all electrically connected, and the mobile terminal 7 is electrically connected to the central processing unit 2 through the communication unit 6; the intelligent monitoring system is characterized by further comprising an oil-immersed transformer 8, the information acquisition unit 1 is used for acquiring running state data information of the oil-immersed transformer 8 and transmitting the data information to the central processing unit 2 for data analysis and processing, the central processing unit 2 is used for comparing and judging a measured value acquired by the information acquisition unit 1 with a system preset value, if the measured value exceeds the preset value, the central processing unit 2 controls the execution unit 3 to execute a corresponding operation instruction, meanwhile, the central processing unit 2 controls the alarm unit 5 to give an alarm, the execution unit 3 is used for executing a corresponding instruction, and the communication unit 6 is used for achieving data intercommunication between the central processing unit 2 and the mobile terminal 7.
In this embodiment, further, the oil-immersed transformer 8 includes a transformer body 9, a low-voltage bushing 10 disposed on the top of the transformer body 9, and a high-voltage bushing 11 disposed on the top of the transformer body 9, the central processing unit 2 is wired to the inside of the transformer body 9 through the high-voltage bushing 11, and the power supply unit 4 is wired to the inside of the transformer body 9 through the low-voltage bushing 10.
In this embodiment, the execution unit 3 further includes a switch valve unit 12 and a temperature control unit 13, where the switch valve unit 12 is configured to control on/off of an internal passage of the oil-immersed transformer 8, and the temperature control unit 13 is configured to reduce the temperature inside the oil-immersed transformer 8 to be below a preset temperature value.
In this embodiment, further, the information collecting unit 1 includes an infrared temperature measuring sensor 14, a pressure sensor 15 and a liquid level sensor 16, the infrared temperature measuring sensor 14 is configured to collect temperature data in the oil-immersed transformer 8, the pressure sensor 15 is configured to collect oil pressure of an oil tank of the oil-immersed transformer 8, the liquid level sensor 16 is configured to collect a liquid level height of the oil tank of the oil-immersed transformer 8, the pressure sensor 15 transmits a collected oil pressure value of the oil tank and a collected liquid level height value of the oil tank collected by the liquid level sensor 16 to the central processing unit 2 in real time, and the central processing unit 2 can monitor whether liquid leakage occurs in the oil-immersed transformer 8 on line, when determining that liquid leakage occurs in the oil-immersed transformer 8, the alarm unit 5 is enabled to start operation, the alarm unit 5 is set as a buzzer, and then the buzzer alarms, and fault information of the oil-immersed transformer 8 is timely transmitted to a user through the mobile terminal 7.
In this embodiment, further, the power supply unit 4 is configured to convert ac mains into high-voltage dc power, the power supply unit 4 is provided in this order with an input filter 17, a rectifier 18, a capacitive filter 19, an AC-DC converter 20, an output filter 21 and a protection circuit 22, the input end of the input filter 17 is connected with the alternating current commercial power, the output end of the input filter 17 is electrically connected with the input end of the rectifier 18, the output terminal of the rectifier 18 is electrically connected to the input terminal of the capacitor filter 19, the output terminal of the capacitor filter 19 is electrically connected to the input terminal of the AC-DC converter 20, the output terminal of the AC-DC converter 20 is electrically connected to the input terminal of the output filter 21, the output end of the output filter 21 outputs high-voltage direct current, and the protection circuit 22 is electrically connected with the AC-DC converter 21. The AC mains supply firstly passes through an input filter 17 to filter harmonic interference in the power frequency, then passes through a rectifier 18 and a capacitor filter 19 to be converted into a DC voltage with a certain frequency, and then enters an AC-DC converter 20 after high frequency conversion, the AC-DC converter 20 mainly comprises a high-power switch and a high-frequency transformer, the power switch chops the DC voltage, then the high-frequency transformer converts the DC voltage into a square wave within a required voltage range, and then the square wave is rectified and filtered through an output filter 21 to obtain the required DC voltage.
In this embodiment, further, the central processing unit 2 includes a single chip microcomputer 23, a relay module 24, a photoelectric isolation module 25, and a USB interface module 26, where the single chip microcomputer 23 employs a 51-series single chip microcomputer for receiving signals, completing data analysis and processing, and sending out an operation instruction, the relay module 24 functions as an electronic switch, the photoelectric isolation module 25 is configured to complete conversion from an electrical signal to an optical signal, and then to an electrical signal, so as to reduce interference generated by the action of the relay module 24, and the USB interface module 26 is configured to implement signal communication transmission between the central processing unit 2 and the mobile terminal 7.
In this embodiment, the communication unit 6 further adopts RS232 and RS485 to realize data transmission between the central processing unit 2 and the mobile terminal 7.
In this embodiment, the temperature control unit 13 is further configured as an air cooling device, and the air cooling device is fixedly installed inside the oil-immersed transformer 8.
In this embodiment, the alarm unit 5 is further configured as a buzzer.
In this embodiment, the mobile terminal 7 further adopts a PC.
The working principle and the working process of the invention are as follows: the information acquisition unit 1 is used for acquiring running state data information of the oil-immersed transformer 8, the information acquisition unit 1 comprises an infrared temperature measurement sensor 14, a pressure sensor 15 and a liquid level sensor 16, the infrared temperature measurement sensor 14 is used for acquiring temperature data in the oil-immersed transformer 8, the pressure sensor 15 is used for acquiring oil pressure of an oil tank of the oil-immersed transformer 8, the liquid level sensor 16 is used for acquiring liquid level height of the oil tank of the oil-immersed transformer 8, the information acquisition unit 1 transmits the data information to the central processing unit 2, the central processing unit 2 comprises a single chip microcomputer 23, a relay module 24, a photoelectric isolation module 25 and a USB interface module 26, the single chip microcomputer 23 adopts a 51 series single chip microcomputer for receiving signals, completing data analysis and processing and sending out an operation instruction, the relay module 24 plays a role of an electronic switch, and the photoelectric isolation module 25 is used for completing conversion from electrical signals to optical signals and then to electrical, therefore, interference caused by the action of the relay module 24 is reduced, the USB interface module 26 can realize signal communication transmission between the central processing unit 2 and the mobile terminal 7, and compared with the communication unit 6 adopting RS232 and RS485 communication modes, the USB interface module has the advantages of high transmission speed and strong anti-interference capability. The single chip microcomputer 23 analyzes and processes the collected temperature value in the oil-immersed transformer 8, the oil tank pressure value and the data of the liquid level height of the oil tank, compares the collected temperature value with preset values, judges that the temperature is too high if the collected temperature value is greater than a preset value through comparison, the central processing unit 2 controls the starting work of the temperature control unit 13 in the execution unit 3, the temperature control unit 13 adopts an air cooling device to perform air cooling, the air cooling device is fixedly installed in the oil-immersed transformer 8, the air cooling device starts work to reduce the internal temperature of the oil-immersed transformer 8, and the alarm unit 5 is controlled to perform buzzing alarm.
The power supply unit 4 adopts the test principle of the return voltage method, need charge and discharge to the transformer, utilize app software test of mobile terminal 7 under the condition of the ratio of different charge and discharge time, the change law of return voltage, thereby effectively assess the insulating situation of transformer, judge whether transformer charge-discharge is unusual, and make central processing unit 2 in time assign the answer instruction to execution unit 3, central processing unit 2 closes through the corresponding ooff valve of control switch valve unit 12, thereby avoid the emergence of accident, central processing unit 2 conveys alarm command to alarm unit 5 simultaneously, the buzzer buzzes and reports to the police.
The pressure sensor 15 transmits the oil pressure value of the collected oil tank and the liquid level height value of the oil tank collected by the liquid level sensor 16 to the central processing unit 2 in real time, and whether the oil leakage occurs in the oil-immersed transformer 8 can be monitored on line.
The mobile terminal 7 can be a PC, the central processing unit 2 feeds back fault information such as abnormal charging and discharging, overhigh temperature, oil tank leakage and the like to the mobile terminal 7 through the communication unit 6 in a RS232 and RS485 communication mode, and a user can check the fault information in time; the mobile terminal 7 can also be a handheld terminal device, and receives the running state signal of the oil-immersed transformer 8 in a wireless communication mode, so that a user can timely know fault information and can check the fault information conveniently. The oil-immersed transformer monitoring system provided by the invention can monitor the running state parameters including charge and discharge, temperature and oil tank hydraulic pressure in the oil-immersed transformer 8 in real time, can carry out buzzing alarm through the alarm unit 5 in time if the fault information such as abnormal charge and discharge, overhigh temperature, oil tank leakage and the like occurs, the pressure sensor 15 transmits the oil pressure value of the collected oil tank and the liquid level height value of the oil tank collected by the liquid level sensor 16 to the central processing unit 2 in real time, can monitor whether the oil-immersed transformer 8 leaks on line, can cut off the fault point path of the transformer by controlling the closing of the corresponding switch valve of the switch valve unit 12, avoids the occurrence of accidents, and feeds back the fault value to a user through the mobile terminal 7 in time so as to monitor and check the current working state of the oil-immersed transformer 8 in real time and can carry out emergency operation on power supply fault, the working efficiency of data monitoring and equipment management is greatly improved.
The embodiments of the present invention have been described in detail, but the description is only for the preferred embodiments of the present invention and should not be construed as limiting the scope of the present invention. All equivalent changes and modifications made within the scope of the present invention should be covered by the present patent.
Claims (10)
1. The oil-immersed transformer monitoring system is characterized by comprising an information acquisition unit (1), a central processing unit (2), an execution unit (3), a power supply unit (4), an alarm unit (5), a communication unit (6) and a mobile terminal (7), wherein the information acquisition unit (1), the execution unit (3), the power supply unit (4), the communication unit (5) and the central processing unit (2) are electrically connected, and the mobile terminal (7) is electrically connected with the central processing unit (2) through the communication unit (6); the system also comprises an oil-immersed transformer (8), the information acquisition unit (1) is used for acquiring the running state data information of the oil-immersed transformer (8), and transmits the data information to the central processing unit (2) for data analysis and processing, the central processing unit (2) is used for comparing and judging the measured value acquired by the information acquisition unit (1) with a system preset value, if the measured value exceeds the preset value, the central processing unit (2) controls the execution unit (3) to execute a corresponding operation instruction, meanwhile, the central processing unit (2) controls the alarm unit (5) to alarm, the execution unit (3) is used for receiving and executing the operation command from the central processing unit (2), the communication unit (6) is used for realizing data intercommunication between the central processing unit (2) and the mobile terminal (7).
2. Oil filled transformer monitoring system according to claim 1, characterized in that the oil filled transformer (8) comprises a transformer body (9), a low voltage bushing (10) arranged on top of the transformer body (9) and a high voltage bushing (11) arranged on top of the transformer body (9), the central processing unit (2) is wired to the inside of the transformer body (9) through the high voltage bushing (11), and the power supply unit (4) is wired to the inside of the transformer body (9) through the low voltage bushing (10).
3. The oil-filled transformer monitoring system according to claim 1, wherein the execution unit (3) comprises a switch valve unit (12) and a temperature control unit (13), the switch valve unit (12) is configured to control on/off of an internal passage of the oil-filled transformer (8), and the temperature control unit (13) is configured to cool the inside of the oil-filled transformer (8) to below a preset temperature value.
4. Oil filled transformer monitoring system according to claim 1, characterized in that the information collection unit (1) comprises an infrared temperature sensor (14), a pressure sensor (15) and a liquid level sensor (16), the infrared temperature sensor (14) is used for collecting temperature data in the oil filled transformer (8), the pressure sensor (15) is used for collecting oil pressure of an oil tank of the oil filled transformer (8), and the liquid level sensor (16) is used for collecting liquid level of the oil tank of the oil filled transformer (8).
5. Oil filled transformer monitoring system according to claim 1, wherein the power supply unit (4) is configured to convert AC mains into DC at high voltage, and the power supply unit is sequentially configured as an input filter (17), a rectifier (18), a capacitor filter (19), an AC-DC converter (20), an output filter (21), and a protection circuit (22), wherein an input end of the input filter (17) is connected to the AC mains, an output end of the input filter (17) is electrically connected to an input end of the rectifier (18), an output end of the rectifier (18) is electrically connected to an input end of the capacitor filter (19), an output end of the capacitor filter (19) is electrically connected to an input end of the AC-DC converter (20), and an output end of the AC-DC converter (20) is electrically connected to an input end of the output filter (21), the output end of the output filter (21) outputs high-voltage direct current, and the protection circuit (22) is electrically connected with the AC-DC converter (21).
6. The oil-immersed transformer monitoring system according to claim 1, wherein the central processing unit (2) comprises a single chip microcomputer (23), a relay module (24), a photoelectric isolation module (25) and a USB interface module (26), the single chip microcomputer (23) adopts a 51-series single chip microcomputer for receiving signals, completing data analysis and processing, and sending out an operation instruction, the relay module (24) functions as an electronic switch, the photoelectric isolation module (25) is used for completing conversion from an electrical signal to an optical signal and then to an electrical signal, so that interference generated by action of the relay module (24) is reduced, and the USB interface module (26) is used for realizing signal communication transmission between the central processing unit (2) and the mobile terminal (7).
7. Oil filled transformer monitoring system according to claim 1, characterized in that the communication unit (6) uses RS232 and RS485 to realize data transmission between the central processing unit (2) and the mobile terminal (7).
8. Oil filled transformer monitoring system according to claim 3, characterized in that the temperature control unit (13) is configured as an air cooling device, which is fixedly mounted inside the oil filled transformer (8).
9. Oil filled transformer monitoring system according to claim 1, characterized in that the alarm unit (5) is arranged as a buzzer.
10. Oil filled transformer monitoring system according to claim 1, characterized in that the mobile terminal (7) is a PC.
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| CN2019104654816 | 2019-05-30 | ||
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113865654A (en) * | 2021-12-01 | 2021-12-31 | 广东电网有限责任公司惠州供电局 | Intelligent remote monitoring system of oil-immersed transformer |
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