CN217587567U - Transformer winding deformation on-line monitoring device - Google Patents
Transformer winding deformation on-line monitoring device Download PDFInfo
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- CN217587567U CN217587567U CN202220895317.6U CN202220895317U CN217587567U CN 217587567 U CN217587567 U CN 217587567U CN 202220895317 U CN202220895317 U CN 202220895317U CN 217587567 U CN217587567 U CN 217587567U
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Abstract
The utility model discloses a transformer winding warp on-line monitoring device, the device calculates the impedance parameter of transformer in service through gathering three rings of transformer high pressure sides, middling pressure side and low pressure side or two rings of transformer high pressure sides, the voltage and the electric current of low pressure side to combine the impedance index in the technical data of record on the transformer data plate, calculate transformer winding warp percentage, confirm whether the transformer has the winding unusual, and output corresponding monitoring result; when the deformation percentage of the transformer winding is larger than the fixed value of the deformation percentage of the transformer winding, a monitoring result prompting the abnormity of the transformer winding is output. Therefore, the utility model discloses not only can accurately monitor transformer winding deformation situation, still output the unusual monitoring result of suggestion transformer winding simultaneously, the suggestion fortune dimension personnel in time diagnose and overhaul the trouble that transformer winding probably takes place.
Description
Technical Field
The utility model relates to a transformer fault monitoring technical field especially relates to a transformer winding warp on-line monitoring device.
Background
The power transformer is one of the most important devices in the power system, and the reliability and stability of the power grid are directly affected by the safe operation of the large transformer. In the operation of the transformer, particularly, the winding and insulation of the transformer are subjected to high voltage, strong magnetic field, and large mechanical and thermal loads, so that the transformer winding and other parts are required to have sufficient mechanical strength and heat resistance with electrical insulation strength, and to be able to withstand the impact of a certain overcurrent, overvoltage, and short-circuit electromotive force. Because the transformer is impacted by various short-circuit fault currents in the operation process, especially when short-circuit and outlet faults occur at a short distance, the winding can be impacted by very large impact force brought by the short-circuit currents, the temperature of the winding is increased, the mechanical strength of related wires of the transformer is weakened, and finally the winding of the transformer can be deformed or even completely scrapped under the action of electric power.
Although the structural design of the power transformer has strict requirements, the deformation of the winding often occurs, which has a serious impact on the safe operation of the transformer. Therefore, the transformer winding deformation diagnosis is more and more emphasized by related departments, and the possible faults are diagnosed and maintained in time by accurately monitoring the transformer winding deformation condition, so that the occurrence probability of the transformer operation faults can be effectively reduced, and the stability of a power system is improved.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a: the transformer winding deformation on-line monitoring device can accurately monitor the deformation condition of the transformer winding on line, and can monitor the data output related to the deformation of the transformer winding, so that operation and maintenance personnel can diagnose and overhaul possible faults of the transformer winding in time conveniently.
In order to realize the purpose, the utility model discloses a technical scheme be:
the utility model provides a transformer winding deformation on-line monitoring device which includes:
the device comprises a processing module, an acquisition module and at least one AD conversion module; wherein the content of the first and second substances,
the AD conversion module is used for converting the input voltage signals and current signals of the high voltage side, the medium voltage side and the low voltage side of the transformer or the input voltage signals and current signals of the high voltage side and the low voltage side of the transformer into corresponding digital signals;
the acquisition module is used for acquiring the digital signals converted by the AD conversion module, marking the acquired digital signals with time stamps and transmitting the digital signals with the time stamps to the processing module;
the processing module is used for calculating impedance parameters of the transformer according to the digital signals corresponding to the voltage signals and the current signals of the high voltage side, the medium voltage side and the low voltage side of the transformer or the digital signals corresponding to the voltage signals and the current signals of the high voltage side and the low voltage side of the transformer, which are input by the acquisition module, calculating the deformation percentage of a winding of the transformer by comparing the impedance parameters with impedance indexes in technical data of the transformer, determining whether the winding of the transformer is abnormal or not, and outputting a corresponding monitoring result; when the deformation percentage of the transformer winding is larger than the fixed value of the deformation percentage of the transformer winding, outputting a monitoring result prompting the abnormality of the transformer winding; therefore, operation and maintenance personnel are prompted to diagnose and overhaul possible faults of the transformer winding in time.
According to a specific implementation mode, the utility model discloses an among the transformer winding deformation on-line monitoring device, the AD conversion module includes: the system comprises at least three voltage transformers, at least three current transformers, a signal conditioning unit and an AD converter;
the three voltage transformers are respectively used for carrying out isolation conversion on input voltage signals of a high voltage side, a medium voltage side and a low voltage side of the transformer; the three current transformers are respectively used for carrying out isolation conversion on input current signals of a high-voltage side, a medium-voltage side and a low-voltage side of the transformer; the signal conditioning unit is used for respectively conditioning the voltage signal and the current signal after the voltage transformer and the current transformer are isolated and converted; the AD converter is used for converting the voltage signal and the current signal after signal conditioning into corresponding digital signals.
According to a specific implementation mode, the utility model discloses an among the transformer winding deformation on-line monitoring device, the signal conditioning unit includes: at least three operational amplifiers and at least three proportional-integral operational amplifiers; the voltage signals after isolation conversion are respectively input to an operational amplifier through a low pass filter, are output to the AD converter after being amplified by the operational amplifier, and the current signals after isolation conversion are respectively input to a proportional integral operational amplifier through a low pass filter, are output to the AD converter after being amplified by the proportional integral operational amplifier.
According to a specific embodiment, the utility model discloses an among the transformer winding deformation on-line monitoring device, collection module includes: the FPGA acquires time synchronization information through an IRIG-B interface or determines a time reference through counting pulses generated by the constant-temperature crystal oscillator.
According to a specific implementation mode, the utility model discloses an among the transformer winding deformation on-line monitoring device, collection module still includes: an IRIG-B isolation unit; and the IRIG-B isolation unit is used for converting the time tick signals input through the IRIG-B interface into TTL levels, performing optical coupling isolation and outputting the TTL levels to the FPGA.
According to a specific implementation mode, the utility model discloses an among the transformer winding deformation on-line monitoring device, processing module includes: the device comprises a processing unit, a first serial interface unit, a second serial interface unit and a network interface unit; the processing unit receives information input by the human-computer interaction equipment through the first serial interface unit, outputs a control signal determined by the monitoring result through an I/O interface, and is in communication interaction with the background monitoring system through the second serial interface unit or the network interface unit.
According to a specific implementation mode, the utility model discloses an among the transformer winding deformation on-line monitoring device, FPGA with processing unit passes through network interface connection.
According to a specific implementation mode, the utility model discloses an among the transformer winding deformation on-line monitoring device, processing module still includes: a data storage unit; and the data storage unit is connected with the processing unit through a storage interface.
According to a specific implementation mode, the utility model discloses a transformer winding warp on-line monitoring device still includes: a power supply module; further, the power supply module includes: the power failure detection device comprises an AC/DC conversion unit and a power failure detection unit; the AC/DC conversion unit is used for providing direct current for the FPGA and the processing unit; the power failure detection unit is used for outputting a power failure protection trigger signal to the FPGA and the processing unit when detecting that the output voltage of the AC/DC conversion unit is lower than a set threshold value.
According to a specific implementation mode, the utility model discloses an among the transformer winding deformation on-line monitoring device, power module still includes: and the energy storage unit is used for providing direct current for the FPGA and the processing unit when the output voltage of the AC/DC conversion unit is lower than a set threshold value.
To sum up, owing to adopted above-mentioned technical scheme, the beneficial effects of the utility model are that:
the utility model discloses a transformer winding warp on-line monitoring device, through gathering three rings of transformer high pressure side, middling pressure side and low pressure side or two rings of transformer high pressure side, the voltage and the electric current of low pressure side, calculate the impedance parameter of transformer in the operation to combine the impedance index in the technical data of record on the transformer data plate, calculate transformer winding warp percentage, confirm whether the transformer has the winding unusual, and output corresponding monitoring result; and when the deformation percentage of the transformer winding is greater than the fixed value of the deformation percentage of the transformer winding, outputting a monitoring result prompting the abnormity of the transformer winding. Therefore, the utility model discloses not only can accurately monitor transformer winding deformation situation, still output the unusual monitoring result of suggestion transformer winding simultaneously, the suggestion fortune dimension personnel in time diagnose and overhaul the trouble that transformer winding probably takes place.
Drawings
FIG. 1 is a schematic diagram of an embodiment of the present invention;
fig. 2 is a schematic structural diagram of an AD conversion module in the present invention;
FIG. 3 is a schematic view of another embodiment of the present invention;
fig. 4 is a schematic structural diagram of the middle power module of the present invention.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings.
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.
As shown in fig. 1, the utility model discloses a transformer winding warp on-line monitoring device, it includes:
the device comprises a processing module, an acquisition module and at least one AD conversion module; specifically, the number of the AD conversion modules is determined according to the number of the transformers which need to be monitored actually.
The AD conversion module is used for converting input voltage signals Un (A, B, C) and current signals In (A, B, C) at the high-voltage side, the medium-voltage side and the low-voltage side of the three-turn transformer into corresponding digital signals; although not shown in fig. 1, it can be understood that the AD conversion module of the present invention can necessarily convert the input voltage signal and current type of the high-voltage side and the low-voltage side of the two-turn transformer into corresponding digital signals.
The acquisition module is used for acquiring the digital signals converted by the AD conversion module, marking the acquired digital signals with time stamps and transmitting the digital signals with the time stamps to the processing module;
the processing module is used for calculating impedance parameters of the transformer according to the digital signals corresponding to the voltage signals and the current signals of the high-voltage side, the medium-voltage side and the low-voltage side of the three-turn transformer or the digital signals corresponding to the voltage signals and the current signals of the high-voltage side and the low-voltage side of the two-turn transformer input by the acquisition module, calculating the deformation percentage of a winding of the transformer by comparing the impedance parameters with impedance indexes in technical data of the transformer, determining whether the winding of the transformer is abnormal or not, and outputting corresponding monitoring results; when the deformation percentage of the transformer winding is larger than the fixed value of the deformation percentage of the transformer winding, outputting a monitoring result prompting the abnormity of the transformer winding; therefore, operation and maintenance personnel are prompted to diagnose and overhaul possible faults of the transformer winding in time.
Therefore, the utility model discloses a transformer winding warp on-line monitoring device, through gathering three rings of voltage and the electric current of transformer high pressure side, middling pressure side and low pressure side or two rings of transformer high pressure side, low pressure side, calculate the impedance parameter of transformer in the operation to combine the impedance index in the technical data of record on the transformer data plate, calculate transformer winding warp percentage, confirm whether the transformer has the winding unusual, and output corresponding monitoring result; and when the deformation percentage of the transformer winding is greater than the fixed value of the deformation percentage of the transformer winding, outputting a monitoring result prompting the abnormity of the transformer winding. Therefore, the utility model discloses not only can accurately monitor transformer winding deformation situation, still output the unusual monitoring result of suggestion transformer winding simultaneously, the suggestion fortune dimension personnel in time diagnose and overhaul the trouble that transformer winding probably takes place.
As shown in fig. 2, the utility model discloses an among the transformer winding deformation on-line monitoring device, AD conversion module includes: the device comprises at least three voltage transformers, at least three current transformers, a signal conditioning unit and an AD converter.
The voltage transformer A, the voltage transformer B and the voltage transformer C are respectively used for carrying out isolation conversion on input voltage signals UA, UB and UC at the high-voltage side, the medium-voltage side and the low-voltage side of the three-turn transformer; the current transformer A, the current transformer B and the current transformer C are respectively used for carrying out isolation conversion on input current signals IA, IB and IC at the high-voltage side, the medium-voltage side and the low-voltage side of the three-turn transformer; when the transformer is implemented, voltage signals UA, UB and UC at the high voltage side, the medium voltage side and the low voltage side of the transformer pass through a protection PT, and then are subjected to isolation conversion through a voltage transformer of an AD conversion module; the current signals IA, IB and IC on the high, medium and low voltage sides of the transformer are first passed through an external 3000:1, after measuring an open-close type current transformer in the range of 0-100A, carrying out isolation conversion by a voltage transformer of an AD conversion module.
The signal conditioning unit is used for respectively conditioning the voltage signal and the current signal after the voltage transformer and the current transformer are isolated and converted; the AD converter is used for converting the voltage signal and the current signal which are subjected to signal conditioning into corresponding digital signals. In implementation, the AD converter uses a multi-channel AD conversion chip.
Specifically, the signal conditioning unit includes: at least three operational amplifiers and at least three proportional-integral operational amplifiers; wherein, the voltage signal UA after the isolation conversion 1 、UB 1 And UC 1 Respectively input to an operational amplifier through a low pass filter, amplified and converted into (0- +/-5V) signals by the operational amplifier and then output to the AD converter, and the current signals IA after isolated conversion 1 、IB 1 And IC 1 Respectively input to a proportional integral operational amplifier through a low pass filter, and then the proportional integral operational amplifier is subjected to the proportional integral operationThe amplifier amplifies and converts the signals into (0 to +/-5V) signals and outputs the signals to the AD converter. In practice, the low-pass filter used by the signal conditioning unit is a first-order low-pass filter.
As shown in fig. 2 again, the utility model provides an AD conversion module converts the voltage signal and the current model of the two rings of transformer high-pressure sides of input and low pressure side to corresponding digital signal, and voltage transformer B and current transformer B do not have the output in fact being equivalent to, and voltage transformer A, voltage transformer C, current transformer A, current transformer C all have the output.
As shown in fig. 3, the utility model discloses an among the transformer winding deformation on-line monitoring device, collection module includes: the FPGA acquires time synchronization information through an IRIG-B interface or determines a time reference through counting pulses generated by the constant-temperature crystal oscillator.
The processing module comprises: the device comprises a processing unit, a first serial interface unit, a second serial interface unit and a network interface unit; the processing unit receives information input by the human-computer interaction equipment through the first serial interface unit, outputs a control signal determined by the monitoring result through an I/O interface, and is in communication interaction with the background monitoring system through the second serial interface unit or the network interface unit.
Specifically, the FPGA acquires digital signals converted by the connected AD converters through a data bus, and marks timestamps on the acquired digital signals by using the acquired time synchronization information or a time reference determined according to the constant temperature crystal oscillator, and stores the digital signals with the timestamps in the internal SDRAM; then, the FPGA packages the data with time stamp in the SDRAM according to a specified format in a first-in first-out mode and transmits the data to the processing unit through a network bus by a network interface.
And after receiving the data with the timestamp transmitted by the FPGA, the processing unit stores the data into an internal cache, and calculates the impedance parameter of the transformer by using a short-circuit impedance algorithm. Specifically, it is a common technical means in the art to acquire the voltage and current at the high voltage side, the medium voltage side and the low voltage side of a three-turn transformer or at the high voltage side and the low voltage side of a two-turn transformer and calculate the impedance parameters of the transformer in operation by using a short-circuit impedance algorithm. After the processing unit calculates the impedance parameter of the transformer, the deformation percentage of the winding of the transformer is calculated by comparing the impedance parameter with the impedance index in the technical data of the transformer, whether the winding of the transformer is abnormal or not is determined, and a corresponding monitoring result is output; and when the deformation percentage of the transformer winding is greater than the fixed value of the deformation percentage of the transformer winding, the transformer winding is abnormal. The monitoring result output by the processing unit comprises information indicating whether the transformer winding is abnormal or not, a control signal determined by whether the transformer winding is abnormal or not and related real-time data, such as calculated impedance parameters of the transformer, real-time voltage and current data of the transformer and the like. The processing unit can transmit the monitoring result to the background monitoring system through the first serial interface unit or the network interface unit, and can directly output a control signal to a controlled device, such as a relay, through the I/O interface; the processing unit is connected with a man-machine interaction device such as an LCD display screen, a key input module, an operation state indicator lamp and a debugging network port through a second serial interface unit; the processing unit outputs information such as electric parameter data, impedance parameters, transformer abnormity, device abnormity, power supply power failure alarm and the like of the transformer to the LCD display screen for displaying, and can also prompt the transformer abnormity, the device abnormity, the power supply power failure alarm and the like through the running state indicator lamp, and the key input module and the debugging network interface are used for configuring and modifying parameters such as impedance indexes, transformer winding deformation percentage fixed values, serial port baud rates, IP addresses and the like in the technical data of the transformer.
In practice, the acquisition module further comprises: an IRIG-B isolation unit; and the IRIG-B isolation unit is used for converting time tick signals input through the IRIG-B interface into TTL (transistor-transistor logic) levels, performing optical coupling isolation and outputting the time tick signals to the FPGA. Meanwhile, the FPGA converts time setting information input by an external time setting module into standard time information (including year, month, day, hour, minute and second) and second pulse, and the time setting is carried out on the time setting information and the processing unit through the NTP protocol through a network interface, and the second pulse is sent to the processing unit in a hard connection mode, so that the accurate time setting with the processing unit is realized; and when the IRIG-B interface is not time-aligned, the internal time reference of the FPGA is maintained through the pulse counting of the high-precision constant-temperature crystal oscillator, and unified time information and second pulses are provided for the processing unit.
In the transformer winding deformation on-line monitoring device, the FPGA adopts XC6SLX9-2TQG144I provided by Xilinx company as a core chip, and can provide a leading system integration function for large-capacity application at the lowest cost; the processing unit selects an FETA40i-C core board, is designed based on A4-core Cortex-A7A 40i core of a platform-level processor in the full-field industrial control industry, integrates a MALI400MP2 GPU and a memory 1GB/2GB DDR3L at a main frequency of 1.2GHz, and stores 8GB eMMC. The method can support most of currently popular videos and picture formats to be decoded, has the advantages of stable and reliable industrial-level product performance, high cost performance, low power consumption and the like, is loaded with a Linux and Android operating system, can simplify hardware design, shortens the research and development period, has rich peripheral resources and interfaces, and meets the requirements of device resources and interfaces.
In practice, the processing module further comprises: a data storage unit; moreover, the data storage unit is connected with the processing unit through a storage interface, so that the storage of a large amount of local transient recording data is facilitated.
As shown in fig. 4, the utility model discloses a transformer winding warp on-line monitoring device still includes: a power supply module; further, the power supply module includes: the power failure detection device comprises an AC/DC conversion unit and a power failure detection unit; the AC/DC conversion unit is used for providing direct current for the FPGA and the processing unit; the power failure detection unit is used for outputting a power failure protection trigger signal to the FPGA and the processing unit when detecting that the output voltage of the AC/DC conversion unit is lower than a set threshold value.
The power module further includes: and the energy storage unit is used for providing direct current for the FPGA and the processing unit when the output voltage of the AC/DC conversion unit is lower than a set threshold value.
When the AC/DC conversion unit is implemented, the AC/DC conversion unit adopts an AC/DC switching power supply with a wide voltage input range, supports direct current power supply and can complete AC: 85-264V or DC: the high voltage of 88-370V is converted into DC voltage of 5V for output, and the power supply is cut off automatically after short circuit and overload and can be recovered automatically after load is removed. When the external power supply normally works and the output voltage of the AC/DC conversion unit is greater than 4.8V, the power failure detection unit outputs a high level signal, when the external power supply is lost and the output voltage of the AC/DC conversion unit is less than 4.8V, the power failure detection unit outputs a low level signal, the FPGA and the processing unit detect that the low level signal triggers a power failure protection function, the main program quits operation after completing necessary file storage work, and system errors caused by power supply instability are prevented. And the energy storage unit comprises a charging management circuit and a farad capacitor, when the external power supply works normally and the output voltage of the AC/DC conversion unit is greater than 4.8V, the charging management circuit charges the farad capacitor according to the constant current of 440 milliamperes, and when the external power supply is lost and the output voltage of the AC/DC conversion unit is less than 4.8V, the farad capacitor supplies electric energy to the FPGA and the processing unit through the DC/DC converter.
The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. The utility model provides a transformer winding warp on-line monitoring device which characterized in that includes:
the device comprises a processing module, an acquisition module and at least one AD conversion module; wherein the content of the first and second substances,
the AD conversion module is used for converting input voltage signals and current signals of the high-voltage side, the medium-voltage side and the low-voltage side of the transformer or input voltage signals and current signals of the high-voltage side and the low-voltage side of the transformer into corresponding digital signals;
the acquisition module is used for acquiring the digital signals converted by the AD conversion module, marking the acquired digital signals with time stamps and transmitting the digital signals with the time stamps to the processing module;
the processing module is used for calculating impedance parameters of the transformer according to the digital signals corresponding to the voltage signals and the current signals of the high voltage side, the medium voltage side and the low voltage side of the transformer input by the acquisition module or the digital signals corresponding to the voltage signals and the current signals of the high voltage side and the low voltage side of the transformer, calculating the deformation percentage of a winding of the transformer by comparing the impedance parameters with impedance indexes in technical data of the transformer, determining whether the winding of the transformer is abnormal or not, and outputting corresponding monitoring results; when the deformation percentage of the transformer winding is larger than the fixed value of the deformation percentage of the transformer winding, a monitoring result prompting the abnormity of the transformer winding is output.
2. The transformer winding deformation online monitoring device according to claim 1, wherein the AD conversion module comprises: the system comprises at least three voltage transformers, at least three current transformers, a signal conditioning unit and an AD converter;
the three voltage transformers are respectively used for carrying out isolation conversion on input voltage signals of a high voltage side, a medium voltage side and a low voltage side of the transformer; the three current transformers are respectively used for carrying out isolation conversion on input current signals of a high-voltage side, a medium-voltage side and a low-voltage side of the transformer; the signal conditioning unit is used for respectively conditioning the voltage signal and the current signal after the voltage transformer and the current transformer are isolated and converted; the AD converter is used for converting the voltage signal and the current signal which are subjected to signal conditioning into corresponding digital signals.
3. The on-line monitoring device for transformer winding deformation according to claim 2, wherein the signal conditioning unit comprises: at least three operational amplifiers and at least three proportional-integral operational amplifiers; the voltage signals after isolation conversion are respectively input to an operational amplifier through a low pass filter, are output to the AD converter after being amplified by the operational amplifier, and the current signals after isolation conversion are respectively input to a proportional integral operational amplifier through a low pass filter, are output to the AD converter after being amplified by the proportional integral operational amplifier.
4. The on-line monitoring device for transformer winding deformation according to claim 1, characterized in that the acquisition module comprises: and the FPGA acquires time comparison information through an IRIG-B interface or determines a time reference through counting pulses generated by a constant-temperature crystal oscillator.
5. The transformer winding deformation online monitoring device according to claim 4, wherein the acquisition module further comprises: an IRIG-B isolation unit; and the IRIG-B isolation unit is used for converting the time tick signals input through the IRIG-B interface into TTL levels, performing optical coupling isolation and outputting the TTL levels to the FPGA.
6. The on-line transformer winding deformation monitoring device according to claim 4, wherein the processing module comprises: the device comprises a processing unit, a first serial interface unit, a second serial interface unit and a network interface unit; the processing unit receives information input by the human-computer interaction device through the first serial interface unit, outputs a control signal determined by the monitoring result through an I/O interface, and is in communication interaction with the background monitoring system through the second serial interface unit or the network interface unit.
7. The on-line monitoring device for transformer winding deformation according to claim 6, wherein the FPGA is connected with the processing unit through a network interface.
8. The on-line monitoring device for transformer winding deformation according to claim 6, wherein the processing module further comprises: a data storage unit; and the data storage unit is connected with the processing unit through a storage interface.
9. The on-line monitoring device for transformer winding deformation according to claim 6, further comprising: a power supply module; further, the power supply module includes: the power failure detection device comprises an AC/DC conversion unit and a power failure detection unit; the AC/DC conversion unit is used for providing direct current for the FPGA and the processing unit; the power failure detection unit is used for outputting a power failure protection trigger signal to the FPGA and the processing unit when detecting that the output voltage of the AC/DC conversion unit is lower than a set threshold value.
10. The on-line monitoring device for transformer winding deformation according to claim 9, wherein the power module further comprises: and the energy storage unit is used for providing direct current for the FPGA and the processing unit when the output voltage of the AC/DC conversion unit is lower than a set threshold value.
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| CN202220895317.6U CN217587567U (en) | 2022-04-18 | 2022-04-18 | Transformer winding deformation on-line monitoring device |
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