CN215833530U - Transformer monitoring system - Google Patents
Transformer monitoring system Download PDFInfo
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- CN215833530U CN215833530U CN202123294972.0U CN202123294972U CN215833530U CN 215833530 U CN215833530 U CN 215833530U CN 202123294972 U CN202123294972 U CN 202123294972U CN 215833530 U CN215833530 U CN 215833530U
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Abstract
The utility model discloses a transformer monitoring system, which comprises a data gathering unit, a transformer neutral point current monitoring module, a transformer noise monitoring module, a transformer vibration monitoring module, a transformer iron core grounding current monitoring module and a transformer high-frequency current monitoring module, wherein the data gathering unit is used for gathering data; the data summarization unit communicates with each monitoring module through wired RS485 or wireless Lora communication mode, and the data summarization unit provides synchronous measurement signals for each monitoring module through the wireless synchronous instruction of hardware pulse signals, ensures that each monitoring module can start the measurement work at the same moment. The utility model provides a wireless monitoring mode aiming at the site where signal cables are not suitable to be laid, a monitoring module is wireless and non-humanized, a wireless Lora communication mode is adopted, the monitoring module is powered by a battery, a power supply cable is not needed, the electric quantity consumption is controlled by using an ultra-low power consumption working mode, and various site working condition conditions are met.
Description
Technical Field
The utility model relates to the field of power equipment monitoring, in particular to a transformer monitoring system.
Background
The power transformer is an important device of a transformer substation, and the interior of the power transformer contains a large amount of insulating oil and a certain amount of combustible materials such as paperboards, wood and the like. These materials are prone to fire and explosion when exposed to high temperatures, sparks or electric arcs, etc. Especially, a great amount of burning oil flows outwards, so that the fire is easy to spread and expand. The fire of the transformer is mostly caused by internal faults, including coil damage, poor conductor contact, iron core fault and the like. The monitoring system of the oil-immersed power transformer monitors signals generated in the later development stage of internal defects of the transformer and the initial stage of arc faults, and carries out early warning by comparing the monitoring signals with a set threshold value so as to provide information for starting fire-fighting facilities.
The alternating current and direct current hybrid power transmission causes the mutual interference of alternating current and direct current systems, and a direct current flows in series at a neutral point of an alternating current transformer in a high-voltage direct current monopole earth operation mode, a nonlinear load (operation of a high-speed rail, a subway and a tramcar), a solar magnetic storm and the like, so that the excitation working point of the transformer is influenced, and direct current magnetic biasing of the alternating current transformer is caused. The influence of the direct current magnetic bias on the transformer is mainly shown in that harmonic current voltage is generated due to magnetic bias saturation of a magnetic loop of the transformer, noise is increased, vibration is aggravated, local overheating and loosening of fastening parts are caused in severe cases, and the normal operation of the transformer is influenced.
Most of the existing transformer monitoring devices only monitor a certain characteristic or parameter singly, and the operation condition of the transformer cannot be accurately reflected and diagnosed through the monitoring of the single parameter. The existing transformer monitoring device monitors through a wired sensor, a large number of signal cables need to be laid, the field construction amount is large, and the field implementation is complex.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a transformer monitoring system.
The technical solution for realizing the purpose of the utility model is as follows: a transformer monitoring system comprises a data summarizing unit, a transformer neutral point current monitoring module, a transformer noise monitoring module, a transformer vibration monitoring module, a transformer iron core grounding current monitoring module and a transformer high-frequency current monitoring module;
the data summarization unit mainly comprises power module, the control unit, data memory cell, measurement synchronizing signal unit, RS485 communication unit and wireless lora communication unit, and the data summarization unit carries out the communication through RS485 communication unit or wireless lora communication unit and each monitoring module, the control unit is connected with power module, data memory cell, measurement synchronizing signal unit, RS485 communication unit, wireless lora communication unit respectively, and power module is used for the power supply of data summarization unit, and data memory cell is used for saving the data that each monitoring module gathered, measures synchronizing signal unit and is used for providing synchronous pulse signal, supplies each monitoring module synchronous start measurement work.
Compared with the prior art, the utility model has the following remarkable advantages:
(1) the wireless monitoring mode is provided for the site where signal cables are not suitable to be laid, the monitoring module is wireless and non-powered, a wireless Lora communication mode is adopted, the monitoring module is powered by a battery, a power supply cable is not needed, the electric quantity consumption is controlled by using an ultra-low power consumption working mode, and various site working condition conditions are met;
(2) the utility model has the real-time and synchronous measurement function of multiple parameters of the transformer, can monitor the neutral point direct current of the transformer, the vibration of the transformer body, the noise of the transformer, the grounding current of the transformer core/clamp and the grounding high-frequency current of the transformer core/clamp/shell at the same time, and accurately diagnoses the operation condition of the transformer by comparing the data of the multiple parameters;
(3) the neutral point current monitoring module and the iron core grounding current monitoring module adopt open sensors, the grounding point does not need to be opened during installation, the installation is convenient, the measurement precision is high, and the system deployment and implementation are simple.
Drawings
Fig. 1 is a functional schematic diagram of a transformer monitoring system according to the present invention.
Fig. 2 is a schematic diagram of the transformer monitoring system according to the present invention.
FIG. 3 is a functional diagram of a data summarization unit according to the present invention.
FIG. 4 is a functional diagram of a cable monitoring module according to the present invention.
FIG. 5 is a functional diagram of a wireless monitoring module according to the present invention.
Fig. 6 is a schematic diagram of the wireless communication and synchronization functions of the present invention.
Fig. 7 is a schematic diagram of the wired synchronization function of the present invention.
Detailed Description
As shown in fig. 1 and 2, the present invention provides a transformer monitoring system, which includes a data summarizing unit 1, a transformer neutral point current monitoring module 2, a transformer noise monitoring module 3, a transformer vibration monitoring module 4, a transformer core grounding current monitoring module 5, and a transformer high-frequency current monitoring module 6;
Furthermore, the transformer neutral point current monitoring module 2, the transformer noise monitoring module 3, the transformer vibration monitoring module 4, the transformer core grounding current monitoring module 5 and the transformer high-frequency current monitoring module 6 respectively comprise a wired monitoring module and a wireless monitoring module.
Furthermore, the number of the monitoring modules is expanded through an RS485 communication mode and a wireless lora communication mode, and the total number of the monitoring modules can reach 1-hundreds.
Furthermore, the monitoring system can simultaneously measure the direct current of the neutral point of the transformer, the vibration of the transformer body, the noise of the transformer, the grounding current of the iron core of the transformer and the grounding high-frequency current of the iron core and the shell of the transformer, and comprehensively judge the operation condition of the transformer.
Furthermore, the transformer neutral point current monitoring module 2 adopts a neutral point current sensor for measuring the direct current of the transformer neutral point, and is communicated with the data collecting unit 1 in a wired cable or wireless LORA connection mode, the neutral point current sensor adopts an open type installation mode, an earth point does not need to be opened during installation and measurement, the installation caliber size is 118 x 20mm, and the flat steel grounding installation size of all neutral points of the power transformer can be matched.
Further, the transformer core grounding current monitoring module 5 adopts a core grounding current sensor for measuring grounding alternating current of the transformer core and the clamping piece, and is communicated with the data collecting unit 1 through a wired cable or a wireless LORA connection mode, the core grounding current sensor adopts an open type installation mode, a grounding point does not need to be opened during installation and measurement, the installation caliber size is 118 x 20mm, and all core/clamping piece grounding installation sizes of the power transformer can be matched.
By extracting neutral point current data, transformer vibration data, transformer noise data and transformer load data, the direct current magnetic bias phenomenon of the transformer can be analyzed and judged. When the current data of the neutral point is increased and the vibration data and the noise data are simultaneously increased, indicating that the transformer has an instruction magnetic biasing site; when a single value of the neutral point current data, the vibration data or the noise data is increased, a disturbance value is determined.
The internal fault defect condition of the oil-immersed transformer can be analyzed and judged by extracting the grounding current data of the transformer, the vibration data of the transformer, the noise data of the transformer and the high-frequency current data of the transformer. Usually, whether the defect of discharging exists in the transformer can not be accurately judged through a single monitoring value, when a plurality of or all of four parameters, namely a grounding current value of the transformer, a vibration value of the transformer, a noise value of the transformer and a high-frequency current value of the transformer, which are monitored are obviously increased at the same moment, the defect of discharging and the like in the transformer at the moment is judged, the monitoring value is continuously and intensively observed, and when the monitoring value exceeds a set threshold value, alarm information is sent. When one of the monitoring values suddenly increases, the monitoring value is considered as an interference value.
The present invention will be further described with reference to the following examples, but the present invention is not limited to these examples.
Examples
As shown in fig. 1 and 2, a transformer monitoring system includes a data collecting unit 1, a wired neutral point current monitoring module, a wired noise monitoring module, a wired vibration monitoring module, a wired iron core ground current monitoring module, a wired high-frequency current monitoring module, a wireless neutral point current monitoring module, a wireless noise monitoring module, a wireless vibration monitoring module, a wireless iron core ground current monitoring module, and a wireless high-frequency current monitoring module.
The data gathering unit 1 acquires measurement data of the wired vibration monitoring module through communication of the RS485 communication mode, the wired neutral point current monitoring module, the wired noise monitoring module, the wired vibration monitoring module, the wired iron core grounding current monitoring module and the wired high-frequency current monitoring module.
As shown in fig. 3, the data summarizing unit 1 is composed of a power module, a control unit, a data storage unit, a measurement synchronization signal unit, an RS485 communication unit, a wireless lora communication unit, and the like. Data summarize unit 1 and communicate with each monitoring module through RS485 communication unit or wireless lora communication unit, the control unit LPC2478 is connected with power module, data memory cell, measurement synchronizing signal unit, RS485 communication unit, wireless lora communication unit respectively, and power module is used for the power supply of data summarize unit 1, and data memory cell is used for saving the data that each monitoring module gathered, and measurement synchronizing signal unit is used for providing the synchronizing pulse signal, supplies each monitoring module synchronous start measurement work.
As shown in fig. 4, the wired monitoring module is composed of a power module, a control unit, a data storage unit, a measurement synchronization signal unit, an RS485 communication unit, a signal processing unit, an a/D conversion unit, and the like; the control unit respectively with power module, the data memory cell, measure the synchronizing signal unit, RS485 communication unit, signal conditioning circuit, AD converting unit connects, power module is used for supplying power for monitoring module, the data memory cell is used for the data that the storage sensor gathered, measure the synchronizing signal unit and be used for providing or receiving each monitoring module's synchronizing signal, RS485 communication unit is used for gathering unit 1 with the data and carries out the communication, the signal processing unit is used for conditioning sensor side output signal and converts the analog signal that AD used, the control unit is used for being connected with each peripheral circuit as CPU.
As shown in fig. 5, the wireless monitoring module is composed of a power module, a control unit, a data storage unit, a LORA communication unit, a signal processing unit, an a/D conversion unit, etc.; the control unit is connected with power module, data memory cell, LORA communication unit, signal conditioning circuit, AD converting unit respectively, and power module is used for supplying power for monitoring module, and data memory cell is used for the data of storage sensor collection, and LORA communication unit is used for carrying out the communication and receiving wireless synchronization instruction with data gathering unit 1, and signal processing unit is used for conditioning sensor side output signal and converts the analog signal that AD used into, and the control unit is used for being connected with each peripheral circuit as CPU.
As shown in fig. 6, the data summarization unit 1 obtains the measurement data of the wireless monitoring module and generates the wireless synchronization command through communication with the wireless neutral point current monitoring module, the wireless noise monitoring module, the wireless vibration monitoring module, the wireless iron core grounding current monitoring module and the wireless high-frequency current monitoring module in the Lora/470Mhz wireless communication mode.
As shown in fig. 7, the circuit diagram of the synchronization signal measuring unit of the data summarizing unit 1 is shown, the data summarizing unit 1 is connected with the base of the first triode Q1 for pulse signal output, the collector of the first triode Q1 is connected with the positive electrode of the power supply, the emitter of the first triode Q1 is connected with the positive input end of the light emitter of the first optocoupler U1, the output of the light emitter of the first optocoupler U1 is connected with the second current limiting resistor R2, the other end of the current limiting resistor is grounded, one end of the light receiver of the first optocoupler U1 is connected with the power supply, the other end of the first optocoupler U1 is connected with the first current limiting resistor R1, and simultaneously connected with the synchronization signal input end of the high-frequency current measuring synchronization signal unit, the synchronization signal input end of the iron core grounding current measuring synchronization signal unit, the synchronization signal input end of the neutral point current measuring synchronization signal unit, the synchronization signal input end of the vibration measuring synchronization signal unit, and the synchronization signal input end of the noise measuring synchronization signal unit, the other end of the first current-limiting resistor R1 is connected with a power ground, the synchronous signal output end of the high-frequency current measurement synchronous signal unit is connected with one end of a first diode D1, the other end of the first diode D1 is connected with the base of a second triode Q2, the synchronous signal output end of the iron core grounding current measurement synchronous signal unit is connected with one end of the second diode D2, the other end of the second diode D2 is connected with the base of a second triode Q2, the synchronous signal output end of the neutral point current measurement synchronous signal unit is connected with one end of a third diode D3, the other end of the third diode D3 is connected with the base of a second triode Q2, the synchronous signal output end of the vibration measurement synchronous signal unit is connected with one end of a fourth diode D4, the other end of a fourth diode D4 is connected with the base of the second triode Q2, the synchronous signal output end of the noise measurement synchronous signal unit is connected with one end of a fifth diode D5, the other end of the fifth diode D5 is connected to the base of the second triode Q2, the collector of the second triode Q2 is connected to the positive electrode of the power supply, the emitter of the second triode Q2 is connected to the light emitting end of the second optocoupler U2, the other pin of the light emitting end of the second optocoupler U2 is connected to the third current limiting resistor R3, the other end of the third current limiting resistor R3 is connected to the ground of the power supply, one end of the light receiver of the second optocoupler U2 is connected to the positive electrode of the power supply, the other end of the light receiver of the second optocoupler U2 is connected to the input end of the data summarizing module for measuring the synchronous signals, the other end of the light receiver of the second optocoupler U2 is connected to the fourth current limiting resistor R4, and the other end of the fourth current limiting resistor R4 is connected to the ground of the power supply.
Claims (6)
1. A transformer monitoring system is characterized by comprising a data summarizing unit (1), a transformer neutral point current monitoring module (2), a transformer noise monitoring module (3), a transformer vibration monitoring module (4), a transformer iron core grounding current monitoring module (5) and a transformer high-frequency current monitoring module (6);
data summarization unit (1) mainly comprises power module, the control unit, data memory cell, measurement synchronizing signal unit, RS485 communication unit and wireless lora communication unit, and data summarization unit (1) communicates with each monitoring module through RS485 communication unit or wireless lora communication unit, the control unit is connected with power module, data memory cell, measurement synchronizing signal unit, RS485 communication unit, wireless lora communication unit respectively, and power module is used for summarizing unit (1) power supply for the data, and data memory cell is used for saving the data that each monitoring module gathered, measures synchronizing signal unit and is used for providing synchronous pulse signal, supplies each monitoring module synchronous start measurement work.
2. The transformer monitoring system according to claim 1, wherein the transformer neutral point current monitoring module (2), the transformer noise monitoring module (3), the transformer vibration monitoring module (4), the transformer core grounding current monitoring module (5) and the transformer high-frequency current monitoring module (6) comprise both wired and wireless monitoring modules.
3. The transformer monitoring system of claim 2, wherein the number of monitoring modules is expanded by an RS485 communication mode and a wireless lora communication mode.
4. The transformer monitoring system according to claim 1, characterized in that the transformer neutral point current monitoring module (2) adopts a neutral point current sensor for measuring the direct current of the transformer neutral point, and communicates with the data summarizing unit (1) through a wired cable or a wireless lora connection mode, and the neutral point current sensor adopts an open installation mode.
5. The transformer monitoring system according to claim 1, characterized in that the transformer core grounding current monitoring module (5) adopts a core grounding current sensor for measuring grounding alternating current of the transformer core and the clamping piece, and communicates with the data summarizing unit (1) through a wired cable or a wireless lora connection mode, and the core grounding current sensor adopts an open type installation mode.
6. The transformer monitoring system according to claim 1, characterized in that the measurement synchronization signal unit comprises a first triode (Q1), a second triode (Q2), a first optocoupler (U1), a second optocoupler (U2), a first current limiting resistor (R1), a second current limiting resistor (R2), a third current limiting resistor (R3), a fourth current limiting resistor (R4), a first diode (D1), a second diode (D2), a third diode (D3), a fourth diode (D4) and a fifth diode (D5);
the data summarization unit (1) is connected with the base of a first triode (Q1) through pulse signal output, the collector of the first triode (Q1) is connected with the positive electrode of a power supply, the emitter of the first triode (Q1) is connected with the positive input end of a light emitter of a first optocoupler (U1), the output end of the light emitter of the first optocoupler (U1) is connected with a second current limiting resistor (R2), the other end of the second current limiting resistor (R2) is grounded, one end of a light receiver of the first optocoupler (U1) is connected with the power supply, the other end of the light receiver of the first optocoupler is connected with the first current limiting resistor (R1), and simultaneously connected with a synchronizing signal input end of a high-frequency current measurement synchronizing signal unit, a synchronizing signal input end of an iron core grounding current measurement synchronizing signal unit, a synchronizing signal input end of a neutral point current measurement synchronizing signal unit, a synchronizing signal input end of a vibration measurement synchronizing signal unit and a synchronizing signal input end of a noise measurement synchronizing signal unit, the other end of the first current-limiting resistor (R1) is connected with a power ground, the synchronous signal output end of the high-frequency current measurement synchronous signal unit is connected with one end of a first diode (D1), the other end of the first diode (D1) is connected with the base of a second triode (Q2), the synchronous signal output end of the iron core grounding current measurement synchronous signal unit is connected with one end of the second diode (D2), the other end of the second diode (D2) is connected with the base of the second triode (Q2), the synchronous signal output end of the neutral point current measurement synchronous signal unit is connected with one end of a third diode (D3), the other end of the third diode (D3) is connected with the base of a second triode (Q2), the synchronous signal output end of the vibration measurement synchronous signal unit is connected with one end of a fourth diode (D4), the other end of the fourth diode (D4) is connected with the base of the second triode (Q2), the synchronous signal output end of the noise measurement synchronous signal unit is connected with one end of a fifth diode (D5), the other end of the fifth diode (D5) is connected to the base electrode of a second triode (Q2), the collector electrode of the second triode (Q2) is connected to the positive electrode of a power supply, the emitter electrode of the second triode (Q2) is connected to the light emitting end of a second optocoupler (U2), the other pin of the light emitting end of the second optocoupler (U2) is connected with a third current limiting resistor (R3), the other end of the third current limiting resistor (R3) is connected with the power ground, one end of a light receiver of a second optocoupler (U2) is connected with the positive electrode of the power supply, the other end of the light receiver of the second optocoupler (U2) is connected with the input end of the data summarizing module for measuring a synchronous signal, the other end of the light receiver of the second optocoupler (U2) is connected with a fourth current limiting resistor (R4), and the other end of the fourth current limiting resistor (R4) is connected with the power ground.
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| CN202123294972.0U CN215833530U (en) | 2021-12-27 | 2021-12-27 | Transformer monitoring system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115566639A (en) * | 2022-11-14 | 2023-01-03 | 国网湖北省电力有限公司电力科学研究院 | Multi-parameter control transformer neutral point current abnormity protection method |
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2021
- 2021-12-27 CN CN202123294972.0U patent/CN215833530U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115566639A (en) * | 2022-11-14 | 2023-01-03 | 国网湖北省电力有限公司电力科学研究院 | Multi-parameter control transformer neutral point current abnormity protection method |
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