Dry-type transformer discharge detection device
By designing a dry-type transformer discharge detection device and utilizing sound signal collection and amplification technology, the problem of accurately determining partial discharge in dry-type transformers in existing technologies has been solved, achieving safe and efficient detection.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- GUANGZHOU METRO GRP CO LTD
- Filing Date
- 2025-01-16
- Publication Date
- 2026-04-14
AI Technical Summary
In the existing technology, it is difficult to accurately determine whether there is partial discharge in dry-type transformers through manual inspection, and there are potential safety hazards.
Design a dry-type transformer discharge detection device, including a sound collection module, an audio preamplifier module, a frequency selection module, an audio amplification module, and an audio output module. The device determines the discharge status by collecting and amplifying the sound signals during transformer discharge.
This improves the safety and efficiency of transformer discharge detection, reduces the risk to operators, and avoids complex operations and damage to other parts of the transformer.
Smart Images
Figure CN224122695U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of transformer testing technology, specifically to a dry-type transformer discharge detection device. Background Technology
[0002] Dry-type transformers are common equipment in power systems, substations, and distribution networks. However, transformers are prone to partial discharge under operating voltage. Currently, manual inspection relies on the human eye and hearing to determine the presence of discharge, especially in the early stages of partial discharge, where visual and auditory assessment alone is insufficient. Furthermore, this method poses significant safety hazards to personnel. Utility Model Content
[0003] The purpose of this invention is to overcome the shortcomings and deficiencies in the existing technology and provide a dry-type transformer discharge detection device that can improve the safety of transformer discharge detection.
[0004] This utility model is achieved through the following technical solution:
[0005] A dry-type transformer discharge detection device, comprising:
[0006] The sound collection module is used to collect the sound signals generated by the dry-type transformer during discharge.
[0007] An audio preamplifier module, connected to the sound collection module, is used to perform primary amplification of the sound signal to obtain a first sound signal;
[0008] A frequency selection module, connected to the audio preamplifier module, is used to filter the frequency of the first sound signal to obtain a second sound signal;
[0009] An audio amplification module, connected to the frequency selection module, is used to amplify the second sound signal a second time to obtain a third sound signal;
[0010] An audio output module, connected to the audio amplification module, is used to output the third sound signal.
[0011] As a further improvement of this utility model, the sound collection module includes: a housing and a microphone;
[0012] The microphone is placed inside the housing and connected to the audio preamplifier module.
[0013] As a further improvement of this utility model, the outer shell is configured as a funnel shape, and the inner side is covered with copper foil.
[0014] As a further improvement of this utility model, this utility model also includes: a gain adjustment module connected to the audio preamplifier module, the gain adjustment module being used to adjust the current of the audio preamplifier module.
[0015] As a further improvement of this utility model, this utility model also includes: a power supply unit connected to the audio preamplifier module, the audio amplification module, and the audio output module, the power supply unit being used to provide operating voltage.
[0016] As a further improvement of this utility model, the audio preamplifier module includes: a preamplifier circuit and a primary amplifier circuit;
[0017] The input terminal of the preamplifier circuit is connected to the microphone, and the output terminal is connected to the primary amplifier circuit. The output terminal of the primary amplifier circuit is connected to the frequency selection module.
[0018] As a further improvement of this utility model, the frequency selection module includes: a plurality of frequency selection circuits arranged in parallel;
[0019] The input terminal of the frequency selection circuit is connected to the audio preamplifier module, and the output terminal is connected to the audio amplification module.
[0020] As a further improvement of this utility model, the audio amplification module includes: a first gain channel circuit, a second gain channel circuit, and a third gain channel circuit;
[0021] The input terminal of the first gain channel circuit is connected to the frequency selection module, and the output terminal is connected to the input terminal of the second gain channel circuit.
[0022] The output terminal of the second gain channel circuit is connected to the input terminal of the third gain channel circuit, and the output terminal of the third gain channel circuit is connected to the audio output module.
[0023] As a further improvement of this utility model, this utility model also includes: a volume adjustment module connected between the audio amplification module and the audio output module, used to adjust the volume of the third sound signal.
[0024] Compared with the prior art, this utility model has the following advantages: by setting a sound collection module to collect the sound of the transformer running, and using an audio preamplifier module and an audio amplification module to amplify the sound to a frequency band that can be heard by humans, the sound is finally output through an audio output module, and the operator listens to these sounds to judge the discharge status of the transformer. Attached Figure Description
[0025] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0026] Figure 1 This is a schematic diagram of the overall structure of the dry-type transformer discharge detection device described in this utility model;
[0027] Figure 2 This is another overall structural schematic diagram of the dry-type transformer discharge detection device described in this utility model;
[0028] Figure 3 This is a schematic diagram of the structure of the outer shell of this utility model;
[0029] Figure 4 This is a schematic diagram of the gain adjustment module described in this utility model;
[0030] Figure 5 This is a schematic diagram of the power supply unit described in this utility model;
[0031] Figure 6 This is a schematic diagram of the audio preamplifier module described in this utility model;
[0032] Figure 7 This is a schematic diagram of the frequency selection module described in this utility model;
[0033] Figure 8 This is a schematic diagram of the structure of the audio amplification module described in this utility model;
[0034] Figure 9 This is a schematic diagram of the volume adjustment module described in this utility model;
[0035] Figure 10 This is a schematic diagram of the audio output module of this utility model.
[0036] In the diagram: 1. Sound collection module; 11. Housing; 12. Microphone; 2. Audio preamplifier module; 21. Preamplifier circuit; 22. Primary amplifier circuit; 3. Frequency selection module; 31. Frequency selection circuit; 4. Audio amplification module; 41. First gain channel circuit; 42. Second gain channel circuit; 43. Third gain channel circuit; 5. Audio output module; 6. Gain adjustment module; 7. Power supply unit; 8. Volume adjustment module. Detailed Implementation
[0037] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0038] This invention provides a discharge detection device for dry-type transformers, applicable to various types of dry-type transformers, such as oil-immersed transformers and vacuum pressure impregnation (VPI) transformers. Figure 1 and Figure 2 As shown, it includes: a sound collection module 1, an audio preamplifier module 2, a frequency selection module 3, an audio amplification module 4, and an audio output module 5. The sound collection module 1 is used to collect the sound signal generated by the dry-type transformer during discharge. The audio preamplifier module 2 is connected to the sound collection module 1 and is used to perform primary amplification of the sound signal to obtain a first sound signal. The frequency selection module 3 is connected to the audio preamplifier module 2 and is used to filter the frequency of the first sound signal to obtain a second sound signal. The audio amplification module 4 is connected to the frequency selection module 3 and is used to perform secondary amplification of the second sound signal to obtain a third sound signal. The audio output module 5 is connected to the audio amplification module 4 and is used to output the third sound signal.
[0039] like Figure 3 As shown, the sound collection module 1 includes a housing 11 and a microphone 12; the microphone 12 is placed inside the housing 11 and is connected to the audio preamplifier module 2.
[0040] The outer casing 11 is funnel-shaped and covered with copper foil on the inside. The side with the smaller diameter is used to place the microphone 12, and this side is provided with a through hole to connect the microphone 12 to the subsequent circuit. In use, the side with the larger diameter is in close contact with the transformer to collect sound.
[0041] like Figure 4 The present invention further includes a gain adjustment module 6 connected to the audio preamplifier module 2. The gain adjustment module 6 is used to adjust the current of the audio preamplifier module 2. The gain level is adjusted via a single-pole double-throw switch K1. Specifically, the excitation current of the audio preamplifier module 2 is adjusted via the single-pole double-throw switch K1, thereby achieving the purpose of gain adjustment. The two gain channels can amplify the sound signal by approximately 200 times (45dB) and 600 times (55dB), respectively.
[0042] like Figure 5As shown, this utility model also includes a power supply unit 7 connected to the audio preamplifier module 2, the audio amplification module 4, and the audio output module 5. The power supply unit 7 is used to provide the working voltage. In one embodiment, a power management circuit based on the ETA9640 battery management unit is used to convert the external lithium battery into a stable 5V power supply, which can provide a maximum output specification of 1A to meet the power supply requirements of the entire device.
[0043] like Figure 6 As shown, the audio preamplifier module 2 includes a preamplifier circuit 21 and a primary amplifier circuit 22. The input of the preamplifier circuit 21 is connected to the microphone 12, and the output is connected to the primary amplifier circuit 22. The output of the primary amplifier circuit 22 is connected to the frequency selection module 3. The microphone 12 performs preamplification through transistors Q1 and Q2, and then performs primary amplification through the primary amplifier circuit 22, which uses an LM324 for its main function, to obtain the first sound signal.
[0044] like Figure 7 As shown, the frequency selection module 3 includes several frequency selection circuits 31 connected in parallel. The input of each frequency selection circuit 31 is connected to the audio preamplifier module 2, and the output is connected to the audio amplification module 4. Through the frequency selection circuits 31, a matching filter channel is used to filter the frequency and obtain the second audio signal, achieving the purpose of extracting useful weak signals from various noise interferences. Each frequency selection circuit 31 is matched with a different capacitor channel to filter the current signal of the corresponding frequency, thereby achieving the purpose of frequency filtering. The different frequency selection levels are as follows: Level 1: 300-4kHz; Level 2: 450-4kHz; Level 3: 700-4kHz; Level 4: 900-4kHz; Level 5: 1kHz-4kHz.
[0045] like Figure 8 As shown, the audio amplification module 4 includes: a first gain channel circuit 41, a second gain channel circuit 42, and a third gain channel circuit 43; the input terminal of the first gain channel circuit 41 is connected to the frequency selection module 3, and the output terminal is connected to the input terminal of the second gain channel circuit 42; the output terminal of the second gain channel circuit 42 is connected to the input terminal of the third gain channel circuit 43, and the output terminal of the third gain channel circuit 43 is connected to the audio output module 5. In one embodiment, the three high-gain amplification channels of the LM324 are used to amplify the selected frequency audio in three stages to obtain a third sound signal, amplifying the weak sound signal to a suitable range.
[0046] like Figure 9As shown, this utility model also includes a volume adjustment module 8 connected between the audio amplification module 4 and the audio output module 5, used to adjust the volume of the third sound signal. Stepless knobs W1 and W2 are used to adjust the impedance in the circuit and adjust the amplitude of the current signal, thereby achieving the purpose of volume adjustment.
[0047] like Figure 10 As shown, the function of the audio output module 5 is implemented by the SGM4918 chip, which has two independent channels to process the left and right channels of the headphones separately, thereby improving the stability of the third audio signal. The audio output module 5 is connected to the headphones, and the operator can obtain the third audio signal through the headphones.
[0048] The specific working principle of the dry-type transformer discharge detection device is as follows: When applied in the field, the sound collection module is placed on the outer shell of the transformer, and then the frequency is adjusted to the corresponding frequency band when the transformer is discharging through the frequency selection circuit. The sound is then amplified to a level that is audible to humans through the audio amplification module and the volume adjustment module (the normal range of sound frequencies that a normal human ear can hear is 20 Hz to 20000 Hz, and is most sensitive to sounds between 1000 Hz and 3000 Hz). The operator judges the discharge status of the transformer by these sounds.
[0049] In summary, this utility model has the following beneficial effects:
[0050] 1. Reduced Operational Risks: Partial discharge can produce various phenomena, such as charge exchange, energy loss, electromagnetic radiation, sound wave generation, light emission, heat generation, and the decomposition of various gases or the formation of new substances. Partial discharge can be detected by capturing this information. Compared to other methods, the acoustic wave receiving detection device of this invention offers the advantages of simpler and safer operation, reducing operator risk and ensuring operator safety.
[0051] 2. Preventing accidents: The absence of complex wiring and operating interface effectively prevents accidents from occurring.
[0052] 3. Improved work efficiency: Operators can quickly and reliably detect partial discharge phenomena in transformers without needing to perform computer-based or other complex waveform analysis to reach a conclusion. This improves work efficiency and reduces working time and intensity.
[0053] 4. Avoid damage to other parts: No power outage or various power-on tests are required, avoiding potential damage to other parts of the transformer that might occur during power outages or power-on tests.
[0054] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.
Claims
1. A dry-type transformer discharge detection device, characterized in that, include: The sound collection module is used to collect the sound signals generated by the dry-type transformer during discharge. An audio preamplifier module, connected to the sound collection module, is used to perform primary amplification of the sound signal to obtain a first sound signal; A frequency selection module, connected to the audio preamplifier module, is used to filter the frequency of the first sound signal to obtain a second sound signal; An audio amplification module, connected to the frequency selection module, is used to amplify the second sound signal a second time to obtain a third sound signal; An audio output module, connected to the audio amplification module, is used to output the third sound signal.
2. The dry-type transformer discharge detection device according to claim 1, characterized in that, The sound collection module includes: a housing and a microphone; The microphone is placed inside the housing and connected to the audio preamplifier module.
3. The dry-type transformer discharge detection device according to claim 2, characterized in that, The outer shell is funnel-shaped and covered with copper foil on the inside.
4. The dry-type transformer discharge detection device according to claim 1, characterized in that, Also includes: A gain adjustment module connected to the audio preamplifier module is used to adjust the current of the audio preamplifier module.
5. The dry-type transformer discharge detection device according to claim 1, characterized in that, Also includes: A power supply unit connected to the audio preamplifier module, the audio amplification module, and the audio output module, the power supply unit being used to provide operating voltage.
6. The dry-type transformer discharge detection device according to claim 2, characterized in that, The audio preamplifier module includes: a preamplifier circuit and a primary amplifier circuit; The input terminal of the preamplifier circuit is connected to the microphone, and the output terminal is connected to the primary amplifier circuit. The output terminal of the primary amplifier circuit is connected to the frequency selection module.
7. The dry-type transformer discharge detection device according to claim 1, characterized in that, The frequency selection module includes: several frequency selection circuits arranged in parallel; The input terminal of the frequency selection circuit is connected to the audio preamplifier module, and the output terminal is connected to the audio amplification module.
8. The dry-type transformer discharge detection device according to claim 1, characterized in that, The audio amplification module includes: a first gain channel circuit, a second gain channel circuit, and a third gain channel circuit; The input terminal of the first gain channel circuit is connected to the frequency selection module, and the output terminal is connected to the input terminal of the second gain channel circuit. The output terminal of the second gain channel circuit is connected to the input terminal of the third gain channel circuit, and the output terminal of the third gain channel circuit is connected to the audio output module.
9. The dry-type transformer discharge detection device according to claim 1, characterized in that, Also includes: A volume adjustment module connected between the audio amplification module and the audio output module is used to adjust the volume of the third sound signal.