CN211425651U - Transformer noise electric power operation maintenance monitoring devices - Google Patents
Transformer noise electric power operation maintenance monitoring devices Download PDFInfo
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- CN211425651U CN211425651U CN201920704946.4U CN201920704946U CN211425651U CN 211425651 U CN211425651 U CN 211425651U CN 201920704946 U CN201920704946 U CN 201920704946U CN 211425651 U CN211425651 U CN 211425651U
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Abstract
The invention discloses a transformer noise electric power operation maintenance monitoring device, which comprises a plurality of noise sensors, wherein the noise sensors are arranged at different positions of a transformer, the output ends of the noise sensors are connected with a data module through communication links, the output ends of the data module are connected to control switches corresponding to the transformer through cables, the output ends of the data module are connected with a communication module through cables, the communication module is in signal connection with a local control center, and the communication module is in signal connection with an operation and maintenance platform; and the transformer is provided with a noise reduction device.
Description
Technical Field
The invention relates to the field of power supply, in particular to a transformer noise power operation maintenance monitoring device.
Background
A transformer is a device that changes an alternating voltage using the principle of electromagnetic induction. The transformer belongs to an electric appliance with high energy density. The coil has high alternating current, the alternating current can generate an interactively changing magnetic field, and when the interactively changing magnetic field passes through the iron core of the transformer, the iron core vibrates due to magnetostriction of silicon steel sheets, and noise is generated. The noise of the transformer is a continuous noise generated by vibration of the transformer body and vibration of the cooling device. The magnitude of the transformer noise is related to factors such as the capacity of the transformer, the material of the silicon steel sheet, the magnetic flux density of the iron core and the like.
The transformer is provided with a cooling device, and the vibration of the cooling device is caused by the vibration generated when a cooling fan and a transformer oil pump run; the vibration of the transformer body is transmitted to the cooling device through the insulating oil, the pipe joint, the assembly parts of the pipe joint and the like, so that the vibration of the cooling device is intensified, and the radiated noise is increased.
The noise radiated to the periphery of the transformer through the air consists of two parts, wherein one part is the body noise generated by the vibration of the iron core winding, transmitted to the oil tank through a structural part and insulating oil and vibrated by the oil tank; another part is cooling device noise generated by vibration of the cooling fan and the transformer oil pump. The transformer body noise is completely dependent on the magnetostrictive vibration of the iron core.
At present, most transformers on the market do not monitor noise generated when a power transformer operates, and the conventional method is that field electric operation and maintenance personnel monitor the noise through an external special instrument or listen to the noise on the field by the operation and maintenance personnel and judge the operation state of the transformer according to experience. Different operation and maintenance personnel can judge differently, and the accuracy is poor; meanwhile, real-time monitoring of the transformer in operation cannot be realized.
Disclosure of Invention
The invention aims to: to the problems existing in the prior art, the transformer noise power operation maintenance monitoring device is provided, the problem of real-time monitoring of transformer noise is solved, the problem of high monitoring cost of the transformer noise is solved, and the problem of instability of a power supply system caused by the transformer noise is solved.
The technical scheme adopted by the invention is as follows:
a transformer noise electric power operation maintenance monitoring device comprises a plurality of noise sensors, wherein the noise sensors are arranged at different positions of a transformer, the output ends of the noise sensors are connected with a data module through communication links, the output ends of the data module are connected to control switches corresponding to the transformer through cables, the output ends of the data module are connected with a communication module through cables, the communication module is in signal connection with a local control center, and the communication module is in signal connection with an operation and maintenance platform; and the transformer is provided with a noise reduction device.
The noise reduction device is an active noise reduction mechanism. The noise reduction device comprises a transformer box, and the transformer box is sleeved outside the transformer; the inside of transformer case is provided with the microphone, and the microphone is connected with the master control platform, the output of master control platform is connected with the speaker.
The main control platform comprises a DSP control system, and the signal input end of the DSP control system is connected with an A/D conversion circuit; the output end of the audio acquisition device is connected with the pre-amplification circuit, the output end of the pre-amplification circuit is connected with the anti-aliasing filter circuit, and the output end of the anti-aliasing filter circuit is electrically connected with the input end of the A/D conversion circuit; the signal output end of the DSP control system is connected with a D/A conversion circuit, the output end of the D/A conversion circuit is connected with a reconstruction filter circuit, the output end of the reconstruction filter circuit is connected with a voltage following circuit, the output end of the voltage following circuit is connected with a power amplification circuit, and the output end of the power amplification circuit is electrically connected with a loudspeaker.
Further, the utility model discloses a preferable structure of a transformer noise electric power operation maintenance monitoring device, wherein a plurality of noise sensors are arranged on the outer surface of the transformer, and a plurality of noise sensors are arranged on a fixed frame of the transformer; the noise sensors are arranged in a cooling device of the transformer; the noise sensors are arranged at the spatial positions which are 20-50 cm away from the transformer.
Further, the data module comprises a central processing unit and a memory; the central processing unit is connected with the memory through a bus.
Furthermore, a self-diagnosis module and a pre-judgment module are arranged in a memory preset in the memory, a protection set value is preset in the self-diagnosis module, and a central processing unit in the data module compares the received data with the protection set value and outputs a control signal according to the comparison result; the control signal is fed back to the control switches corresponding to the transformers through the communication line.
Furthermore, a pre-judgment set value is preset in the pre-judgment module, a plurality of maintenance schemes are stored in the pre-judgment module, the central processing unit in the data module compares the received data with the pre-judgment set value, and triggers different maintenance schemes according to the comparison result, and the central processing unit outputs the triggered maintenance schemes through signals.
Furthermore, the operation and maintenance platform is provided with judgment parameters, signals transmitted by the operation and maintenance platform communication module are compared with the judgment parameters, corresponding early warning is given, early warning signals are transmitted to workers, and the workers perform field inspection and maintenance.
Further, the noise sensor is an analog sensor or a digital sensor.
In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:
1. the data acquisition is convenient: the monitoring device transmits data to a data module for data acquisition in a wireless communication mode by means of a noise sensor arranged at a cable connection position;
1. monitoring multiple cables simultaneously: by utilizing the multichannel characteristic of the data module, a plurality of transformers of the power system can be sampled and monitored at the same time, so that the installation space is saved;
2. the energy consumption is low: compared with the traditional multi-channel module, the monitoring device has the advantages that the energy consumption is lower and the service life is longer due to the integrated multi-channel characteristic of the monitoring device when the same number of transformer data are received and sent;
3. the expandability is strong: for the condition that the number of transformers is large, an extended data module without a CPU can be additionally arranged, and all data modules share one CPU, so that the expansibility is strong;
4. by arranging the noise reduction device, the active noise reduction capability of the transformer can be realized, and the noise pollution to the environment is reduced.
Drawings
FIG. 1 is a schematic diagram of a noise data acquisition architecture of the present invention;
FIG. 2 is a schematic structural view of the present invention;
FIG. 3 is a block diagram of the noise data flow architecture of the present invention;
FIG. 4 is a flow chart illustrating the noise data determination according to the present invention;
FIG. 5 is a schematic diagram of the construction of the noise reducer of the present invention;
fig. 6 is a block diagram of the noise reducing device of the present invention.
The labels in the figure are: 1 is a transformer box, 2 is a microphone, 3 is a main control platform, and 4 is a loudspeaker.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings.
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
As shown in fig. 1 and 2, the noise detection device comprises a plurality of noise sensors, the noise sensors are arranged at different positions of the transformer, the noise sensors are digital sensors, the noise sensors are transmitted to a noise module through wired communication or wireless communication, the noise module transmits noise signals to a detection device, and the detection device is a data module. The output end of the noise sensor is connected with a data module through a communication link, the output end of the data module is connected to control switches corresponding to the transformers through cables, the output end of the data module is connected with a communication module through a cable, the communication module is in signal connection with a local control center, and the communication module is in signal connection with an operation and maintenance platform. And the transformer is provided with a noise reduction device.
The noise reduction device is an active noise reduction mechanism.
Further, the utility model discloses a preferable structure of a transformer noise electric power operation maintenance monitoring device, wherein a plurality of noise sensors are arranged on the outer surface of the iron core of the transformer, and a plurality of noise sensors are arranged in the middle of the coil of the transformer; the noise sensors are arranged in transformer oil of the transformer.
The data module comprises a central processing unit and a memory; the central processing unit is connected with the memory through a bus.
A self-diagnosis module and a pre-judgment module are arranged in a memory preset in the memory, a protection set value is preset in the self-diagnosis module, a central processing unit in the data module compares the received data with the protection set value, and a control signal is output according to a comparison result; the control signal is fed back to the control switches corresponding to the transformers through the communication line.
When the analog noise sensor is adopted, the noise sensor is connected to the noise module through a wired communication line, a conditioning circuit for preprocessing a noise sensor signal is arranged in the noise module, the input end of the conditioning circuit is connected with the noise sensor, the output end of the conditioning circuit is connected with an A/D conversion circuit, and the A/D conversion circuit converts an analog signal into a digital signal and transmits the digital signal to the data module.
Therefore, the noise is collected in real time, the noise of the cable can be monitored in real time, and the safe operation of the transformer is guaranteed.
The data transmission process is as shown in fig. 3, the noise sensor transmits the acquired noise data to the memory in the data module through the data acquisition channel, and the memory performs data interaction with the processor. And the CPU runs the preset programs in the self-diagnosis module and the pre-judgment module and sends the results out through the communication device.
The operation process of the self-diagnosis module and the pre-judgment module is shown in fig. 4, the noise data value V measured by the noise sensor is transmitted to the memory in the data module, and the memory transmits the data to the CPU. The self-diagnosis module is preset with a noise protection value Vsp on the transformer, the CPU compares the noise data value V with the noise protection value Vsp, and when the noise data value V is less than or equal to the noise protection value Vsp, the data module does not respond and continues the next cycle. When the noise data value V is larger than the noise protection value Vsp, the data module sends out an alarm signal through a cable or controls an electric control switch connected with the transformer to trip, so that the safety of the power supply circuit is protected.
Meanwhile, the data module sends the processed result to a local control center through the communication module and sends the processed result to the operation and maintenance platform through a network access. The noise protection value Vsp is determined according to the factory maximum working noise value, so that the cable is not dangerous.
The pre-judging module is preset with a pre-judging set value Vyp on the transformer, the CPU compares the noise data value V with the pre-judging set value Vyp, and when the noise data value V is less than or equal to the pre-judging set value Vyp, the data module does not respond and continues the next cycle. When the noise data value V is larger than the predetermined value Vyp, the data module triggers a maintenance scheme to protect the safety of the power supply circuit.
Meanwhile, the data module sends the processed result to a local control center through the communication module and sends the processed result to the operation and maintenance platform through a network access.
The prejudgment set value Vyp is a parameter specific to the monitoring device, and is a recommended value obtained by considering aspects such as transformer factory characteristic curves, running records over the years, preventive test reports, environmental noise and the like.
And adjusting according to the working current of the cable and the environmental noise value according to the standard of the safe noise value of the cable when the cable is produced and delivered. The fine adjustment is also carried out according to the service life and the service environment of the cable, when the working environment is higher, the pre-judgment set value Vyp is properly reduced, and when the heavy load time is too long, the pre-judgment set value Vyp is properly reduced. In this way, the operational safety of the cable is ensured.
The maintenance scheme comprises the following steps:
the first-level maintenance scheme comprises the following steps: for on-line inspection, checking whether each operation parameter of the transformer is normal and the operation condition of the load at the lower stage
And (3) secondary maintenance scheme: for the power failure inspection, the load carried by the transformer is mainly inspected and measured to confirm the fault reason.
A three-level maintenance scheme: for the power failure inspection, annual inspection and preventive tests including characteristic tests are performed on the whole transformer.
Example 1:
on the basis of the above embodiments, a preferred mechanism for active noise reduction is disclosed, and the noise reduction device is an active noise reduction mechanism. The noise reduction device comprises a transformer box 1, and the transformer box 1 is sleeved outside the transformer; the inside of transformer case 1 is provided with microphone 2, and microphone 2 is connected with main control platform 3, main control platform 3's output is connected with speaker 4.
The main control platform 3 comprises a DSP control system, and the signal input end of the DSP control system is connected with an A/D conversion circuit; the output end of the audio acquisition device is connected with the pre-amplification circuit, the output end of the pre-amplification circuit is connected with the anti-aliasing filter circuit, and the output end of the anti-aliasing filter circuit is electrically connected with the input end of the A/D conversion circuit; the signal output end of the DSP control system is connected with a D/A conversion circuit, the output end of the D/A conversion circuit is connected with a reconstruction filter circuit, the output end of the reconstruction filter circuit is connected with a voltage following circuit, the output end of the voltage following circuit is connected with a power amplification circuit, and the output end of the power amplification circuit is electrically connected with a loudspeaker 4.
The output end of the microphone 2 is connected with a main control platform through a cable, and the output end of the main control platform is connected with the loudspeaker 4 through a cable. The sound of the voltage transformer collected by the microphone 2 is converted into an electric signal and transmitted to the main control platform, and the main control platform generates sound wave signals with the same frequency and opposite phases after processing; the main control platform emits the generated sound wave signal through the loudspeaker 4, and the generated sound wave signal and the original noise are mutually superposed and offset, so that the noise is eliminated.
In the specific operation process, the microphone 2 is used for collecting the noise of the environment, and the DSP control system is used for carrying out spectrum analysis on the collected noise to obtain the characteristic of the noise; the DSP control system calculates sound wave signals with equal noise sound wave amplitude and opposite phases according to the calculated characteristics of the noise; the DSP control system sends corresponding signals to corresponding sound source equipment, the sound source equipment generates corresponding sound, and the generated sound and the noise are superposed to realize interference cancellation and eliminate low-frequency noise.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (9)
1. The utility model provides a transformer noise electric power operation maintenance monitoring devices which characterized in that: the intelligent transformer control system comprises a plurality of noise sensors, wherein the noise sensors are arranged at different positions of a transformer, the output ends of the noise sensors are connected with a data module through communication links, the output ends of the data module are connected to control switches corresponding to the transformer through cables, the output ends of the data module are connected with a communication module through cables, the communication module is in signal connection with a local control center, and the communication module is in signal connection with an operation and maintenance platform; and the transformer is provided with a noise reduction device.
2. The transformer noise power operation maintenance monitoring device of claim 1, wherein: the noise reduction device comprises a transformer box (1), and the transformer box (1) is sleeved outside the transformer; the transformer box is characterized in that a microphone (2) is arranged inside the transformer box (1), the microphone (2) is connected with a main control platform (3), and the output end of the main control platform (3) is connected with a loudspeaker (4).
3. The transformer noise power operation maintenance monitoring device of claim 2, wherein: the main control platform (3) comprises a DSP control system, and the signal input end of the DSP control system is connected with an A/D conversion circuit; the output end of the audio acquisition device is connected with the pre-amplification circuit, the output end of the pre-amplification circuit is connected with the anti-aliasing filter circuit, and the output end of the anti-aliasing filter circuit is electrically connected with the input end of the A/D conversion circuit; the signal output end of the DSP control system is connected with a D/A conversion circuit, the output end of the D/A conversion circuit is connected with a reconstruction filter circuit, the output end of the reconstruction filter circuit is connected with a voltage following circuit, the output end of the voltage following circuit is connected with a power amplification circuit, and the output end of the power amplification circuit is electrically connected with a loudspeaker (4).
4. A transformer noise power operation maintenance monitoring device according to any one of claims 1-3, characterized by: the noise sensors are arranged on the outer surface of the transformer, and the noise sensors are arranged on a fixing frame of the transformer; the noise sensors are arranged in a cooling device of the transformer; the noise sensors are arranged at the spatial positions which are 20-50 cm away from the transformer.
5. The transformer noise power operation maintenance monitoring device of claim 4, wherein: the data module comprises a central processing unit and a memory; the central processing unit is connected with the memory through a bus.
6. The transformer noise power operation maintenance monitoring device of claim 5, wherein: a self-diagnosis module and a pre-judgment module are arranged in a memory preset in the memory, a protection set value is preset in the self-diagnosis module, a central processing unit in the data module compares the received data with the protection set value, and a control signal is output according to a comparison result; the control signal is fed back to the control switches corresponding to the transformers through the communication line.
7. The transformer noise power operation maintenance monitoring device of claim 6, wherein: the pre-judging module is preset with a pre-judging set value, the pre-judging module is stored with a plurality of maintenance schemes, the central processing unit in the data module compares the received data with the pre-judging set value and triggers different maintenance schemes according to the comparison result, and the central processing unit outputs the triggered maintenance schemes through signals.
8. The transformer noise power operation maintenance monitoring device of claim 7, wherein: and judging parameters are arranged in the operation and maintenance platform, signals transmitted by the operation and maintenance platform communication module are compared with the judging parameters, corresponding early warning is given, early warning signals are transmitted to workers, and the workers perform field inspection and maintenance.
9. The transformer noise power operation maintenance monitoring device of claim 8, wherein: the noise sensor is an analog sensor or a digital sensor.
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| CN201920704946.4U CN211425651U (en) | 2019-05-16 | 2019-05-16 | Transformer noise electric power operation maintenance monitoring devices |
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| CN201920704946.4U CN211425651U (en) | 2019-05-16 | 2019-05-16 | Transformer noise electric power operation maintenance monitoring devices |
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| CN211425651U true CN211425651U (en) | 2020-09-04 |
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