Four-in-one comprehensive detector for power distribution network inspection

Abstract

The utility model belongs to the field of comprehensive detector, specifically is four in one comprehensive detector of distribution network patrol, the lower part of patrol instrument casing is provided with handheld handle, the front side of the casing of patrol instrument is provided with display screen, the left side of patrol instrument is provided with external ultrasonic sensor module, the back of patrol instrument is provided with infrared detector module, the top of patrol instrument is provided with air ultrasonic sensor module, the upper portion of patrol instrument is provided with fitting assembly, acoustic detection module is clamped and is connected with fitting assembly, and the utility model discloses an open type working environment adopts acoustic detection module detection, and closed type working environment adopts air ultrasonic sensor module detection, and the local discharge area will show as high energy bright spot or macule on the image, thereby realizes the intuitive positioning and identification of local discharge position, can judge whether the equipment inside exists local discharge and the severity of discharge through the analysis ultrasonic signal amplitude, frequency, phase and so on, and the advantage of air type ultrasonic detection is that the anti-electromagnetic interference ability is strong, is applicable to the environment of high pressure, strong magnetic field.

Description

Technical Field

[0001] This utility model relates to the field of integrated testing instruments, specifically a four-in-one integrated testing instrument for power distribution network inspection. Background Technology

[0002] The power distribution network inspection instrument mainly includes the following modules: signal processing board (main control PCBA), infrared detector module, power supply and thermal management module. The working principle (signal link) involves converting infrared radiation into an electrical signal. For a target >-273℃ (radiating 8–14µm infrared light), the signal is focused by a germanium lens, absorbed by a focal plane array (FPA), and then subjected to resistance changes. This results in a 0–20mV differential signal per pixel, signal conditioning, and an 80dB programmable gain + 16-bit Σ-Δ ADC by an analog temperature front-end (AFE) chip. The MCU calculates the temperature using Planck's formula, providing a 30Hz real-time bitstream for image and alarm display. An FPGA handles data acquisition, image processing algorithms, and temperature measurement algorithms. The CPU provides image display and interface functions. A 5-inch screen displays 800×480 resolution synchronously, powered by a 12V battery.

[0003] Existing inspection instruments can only detect the temperature of the inspected power equipment, which is a single detection function. If it is necessary to detect the discharge of the inspected power equipment, other instruments are required. Therefore, in order to address the above problems, a four-in-one comprehensive testing instrument for distribution network inspection is proposed. Utility Model Content

[0004] To overcome the shortcomings of existing technologies, this utility model proposes a four-in-one comprehensive testing instrument for power distribution network inspection.

[0005] The technical solution adopted by this utility model to solve its technical problem is: a four-in-one comprehensive testing instrument for power distribution network inspection, including an inspection instrument, a hand grip provided at the lower part of the inspection instrument housing, a display screen provided at the front of the inspection instrument housing, an external ultrasonic sensor module provided on the left side of the inspection instrument, an infrared detector module provided at the rear of the inspection instrument, an air ultrasonic sensor module provided at the top of the inspection instrument, a TEV sensor module also provided at the top of the inspection instrument, and an interlocking component provided at the upper part of the inspection instrument, wherein an acoustic detection module is interlocked with the interlocking component; Preferably, the fitting assembly includes: an elastic locking post and a circuit terminal, wherein the elastic locking post is slidably connected to the hole of the fitting assembly housing, and the circuit terminal is fitted and connected to the inner wall of the fitting assembly. Preferably, the circuit terminal includes a groove, and the groove is formed on the side of the circuit terminal housing; Preferably, the acoustic detection module includes: a connector frame and a connector port, wherein one end of the acoustic detection module housing is fixedly connected to one end of the connector frame, and one end of the connector frame housing is fixedly connected to the end of the connector port; Preferably, the connector includes a handle and an elastic block, wherein the handle is slidably connected to a groove on the side of the connector housing, and the end of the handle is fixedly connected to the end of the elastic block. Preferably, the plug-in port includes: a plug plate and a locking hole, the outer wall of the plug-in port housing is fixedly connected to the end of the plug plate, and the locking hole is opened in the middle of the plug plate.

[0006] The advantages of this utility model are: 1. This utility model uses an acoustic detection module for detection in open working environments and an air ultrasonic sensor module for detection in closed working environments. In the image, partial discharge areas appear as high-energy bright spots or patches, thus achieving intuitive location and identification of the partial discharge position. By analyzing the amplitude, frequency, and phase characteristics of the ultrasonic signal, the presence and severity of partial discharge within the equipment can be determined. The advantages of air ultrasonic detection are strong anti-electromagnetic interference capability and suitability for high-voltage and strong magnetic field environments. A protective cover is provided on the top of the air ultrasonic sensor module; the cover must be opened before measurement can be performed during operation. In the idle state, the protective cover is fastened into the opening slot on the top of the sensor module for protection. When the detection point is located at a high position and it is inconvenient to use the built-in ultrasonic sensor for measurement, an external ultrasonic sensor module 7 can be connected to detect the high-level point using an external air ultrasonic sensor. The two measurement methods can be flexibly switched according to actual needs, and the operation is simple.

[0007] 2. This utility model analyzes parameters such as amplitude, frequency, and pulse count of TEV signals through a TEV sensor module, which can assess the level of partial discharge activity inside the equipment. TEV detection is characterized by high sensitivity and fast response speed, and is suitable for partial discharge detection in confined spaces. The separate design of the acoustic detection module and the inspection instrument allows the acoustic detection module to be quickly assembled and disassembled according to actual needs. The detection function of this device is diversified and can adapt to the diverse detection conditions required in the detection process. Attached Figure Description

[0008] 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.

[0009] Figure 1 This is a schematic diagram of the front three-dimensional structure of the present invention; Figure 2 This is a schematic diagram of the rear three-dimensional structure of the present invention; Figure 3 This is a schematic diagram of the acoustic detection module structure of this utility model; Figure 4 This is a partial structural schematic diagram of the present invention; Figure 5 for Figure 4 A magnified structural diagram of part A.

[0010] In the picture: 1. Inspection instrument; 2. Handheld handle; 3. Display screen; 4. Acoustic detection module; 41. Connector; 411. Handle; 4110. Elastic locking block; 42. Connecting port; 421. Insert plate; 422. Locking hole; 5. Air ultrasonic sensor module; 6. Infrared detector module; 7. External ultrasonic sensor module; 8. Fitting assembly; 81. Elastic locking post; 82. Circuit terminal; 821. Groove; 9. TEV sensor module. Detailed Implementation

[0011] 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 scope of protection of the present utility model.

[0012] The following is in conjunction with the appendix Figure 1-5 This application will be described in further detail. This application discloses a multifunctional distribution network inspection integrated testing instrument, including an inspection instrument 1. The lower part of the housing of the inspection instrument 1 is provided with a hand grip 2. The front side of the housing of the inspection instrument 1 is provided with a display screen 3. The left side of the inspection instrument 1 is provided with an external ultrasonic sensor module 7. The rear side of the inspection instrument 1 is provided with an infrared detector module 6. The top of the inspection instrument 1 is provided with an air ultrasonic sensor module 5. The top of the inspection instrument 1 is also provided with a TEV sensor module 9. The upper part of the inspection instrument 1 is provided with a fitting component 8, and the fitting component 8 is engaged with an acoustic detection module 4. The fitting assembly 8 includes: an elastic locking post 81 and a circuit terminal 82. The elastic locking post 81 is slidably connected to the hole of the housing of the fitting assembly 8, and the circuit terminal 82 is fitted and connected to the inner wall of the fitting assembly 8. The circuit terminal 82 includes a groove 821, and the groove 821 is formed on the side of the housing of the circuit terminal 82; The acoustic detection module 4 includes: a connector 41 and a connector port 42. The end of the housing of the acoustic detection module 4 is fixedly connected to one end of the connector 41, and the end of the housing of the connector 41 is fixedly connected to the end of the connector port 42. The connector 41 includes a handle 411 and an elastic block 4110. The handle 411 is slidably connected to a groove on the side of the connector 41 housing, and the end of the handle 411 is fixedly connected to the end of the elastic block 4110. The plug-in port 42 includes: a plug plate 421 and a locking hole 422. The outer wall of the plug-in port 42 housing is fixedly connected to the end of the plug plate 421, and the locking hole 422 is opened in the middle of the plug plate 421.

[0013] Working principle: When using the inspection instrument 1 for inspection, the detection principle of the infrared detector module 6 is as follows: Based on the principle of infrared radiation, all objects with a temperature above absolute zero will radiate infrared rays, and the radiation intensity is related to the temperature of the object. The infrared detector module 6 receives the infrared radiation emitted by the surface of the power equipment, converts it into an electrical signal, and then processes it to obtain a temperature distribution image of the equipment surface. When the power equipment has an overheating fault (such as poor contact, overload, insulation aging, etc.), the temperature of the faulty part will rise abnormally, which will appear as obvious hot spots on the infrared image, thus allowing the overheating defects of the equipment to be detected intuitively. The acoustic detection module 4 and the air ultrasonic sensor module 5 work together on the following principle: Acoustic imaging technology is used to detect partial discharge in open electrical equipment. The principle is based on the acoustic signals generated by partial discharge. When partial discharge occurs inside the electrical equipment, the discharge process releases energy instantaneously, causing the surrounding air or insulating medium to be violently impacted and generating ultrasonic signals. The acoustic imaging device receives these acoustic signals through multiple high-sensitivity ultrasonic sensor arrays, and then uses beamforming algorithms to process the acoustic signals, presenting the energy distribution of the sound waves in the form of an image, forming an acoustic imaging map. On the image, the partial discharge area will appear as a high-energy bright spot or patch, thus achieving intuitive location and identification of the partial discharge position. The air ultrasonic sensor module 5, used in conjunction with air ultrasonic detection, is mainly used for... The principle of partial discharge detection in open-type power equipment is to capture the ultrasonic signals generated by partial discharge. When partial discharge occurs, it excites ultrasonic waves with a frequency of 20kHz or higher. These ultrasonic waves propagate in the air. The detection equipment receives these signals through a high-sensitivity ultrasonic sensor, and then amplifies, filters, and analyzes the signals. By analyzing the amplitude, frequency, phase, and other characteristics of the ultrasonic signals, it is possible to determine whether partial discharge exists inside the equipment and the severity of the discharge. The advantage of air-based ultrasonic detection is its strong resistance to electromagnetic interference and its suitability for high-voltage and strong magnetic field environments. A protective cover is provided on the top of the air ultrasonic sensor module 5. During operation, the protective cover needs to be opened to perform measurements. When not in use, the protective cover is placed in the opening slot on the top of the air ultrasonic sensor module 5 for protection.

[0014] When using the external ultrasonic sensor module 7, an external air ultrasonic sensor is required. The plug of the external air ultrasonic sensor is inserted into the socket of the external ultrasonic sensor module 7. The air ultrasonic sensor module 5 and the external ultrasonic sensor module 7 work together. When the detection point is at a higher position, the external ultrasonic sensor module 7 is used for detection; otherwise, the air ultrasonic sensor module 5 is used. The TEV sensor module 9 operates on the principle of transient ground voltage (TEV) detection, used for partial discharge detection in enclosed power equipment (such as switchgear, ring main units, etc.). Its principle is to detect partial discharge... The transient ground voltage signal generated by partial discharge: When partial discharge occurs inside the equipment, the discharge pulse current will propagate along the equipment casing or grounding wire, generating instantaneous voltage changes on the equipment surface, i.e., transient ground voltage. The TEV detection device receives these transient voltage signals through capacitive coupling sensors or high-frequency current sensors, and then performs high-frequency amplification, filtering and digital processing on the signals. By analyzing parameters such as amplitude, frequency and pulse count of the TEV signal, the level of partial discharge activity inside the equipment can be evaluated. TEV detection is characterized by high sensitivity and fast response speed, and is suitable for partial discharge detection in confined spaces. TEV and ultrasound are two different methods for detecting partial discharge that complement each other. There are four main types of partial discharge: tip discharge, surface discharge, suspended discharge, and internal discharge. Air ultrasound is more sensitive to tip, surface, and suspended discharges and can detect these three types of discharges, but it is not sensitive to internal discharges and cannot detect them. TEV is more sensitive to internal discharges and can detect them. Therefore, to ensure that all types of discharges can be detected, both different detection methods should be tested during routine inspections.

[0015] When installing the acoustic detection module 4 onto the inspection instrument 1, the insertion hole at the bottom of the insertion port 42 needs to be aligned with the pin of the circuit terminal 82 to make them connected. During this process, the elastic locking post 81 is squeezed by the insertion plate 421. The elastic locking post 81 will first retract into the housing. When the locking hole 422 moves to the position of the elastic locking post 81, the elastic locking post 81 pops out, so that the elastic locking post 81 is locked in the locking hole 422. During the insertion of the acoustic detection module 4, the handle 411 is pinched by hand and the handle 411 is pressed hard, so that the elastic locking block 4110 moves down. The elastic locking block 4110 will be deformed by the pressure of the housing of the circuit terminal 82. When the elastic locking block 4110 is aligned with the groove 821, the elastic locking block 4110 returns to its original shape and is locked in the groove 821. At this time, the acoustic detection module 4 is fixed. The separate design of the acoustic detection module 4 and the inspection instrument 1 allows the acoustic detection module 4 to be quickly disassembled and assembled according to actual needs.

[0016] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model.

Claims

1. A four-in-one integrated testing instrument for power distribution network inspection, comprising an inspection instrument (1), characterized in that: The lower part of the housing of the inspection instrument (1) is provided with a hand grip (2), the front side of the housing of the inspection instrument (1) is provided with a display screen (3), the left side of the inspection instrument (1) is provided with an external ultrasonic sensor module (7), the rear side of the inspection instrument (1) is provided with an infrared detector module (6), the top of the inspection instrument (1) is provided with an air ultrasonic sensor module (5), the top of the inspection instrument (1) is also provided with a TEV sensor module (9), the upper part of the inspection instrument (1) is provided with a fitting component (8), and the fitting component (8) is engaged with an acoustic detection module (4).

2. The integrated four-in-one testing instrument for power distribution network inspection according to claim 1, characterized in that: The fitting assembly (8) includes: an elastic locking post (81) and a circuit terminal (82). The elastic locking post (81) is slidably connected to the hole of the housing of the fitting assembly (8), and the circuit terminal (82) is fitted and connected to the inner wall of the fitting assembly (8).

3. The integrated four-in-one testing instrument for power distribution network inspection according to claim 2, characterized in that: The circuit terminal (82) includes a groove (821), and the groove (821) is formed on the side of the housing of the circuit terminal (82).

4. The integrated four-in-one testing instrument for power distribution network inspection according to claim 1, characterized in that: The acoustic detection module (4) includes: a connector (41) and a connector port (42). The end of the housing of the acoustic detection module (4) is fixedly connected to one end of the connector (41), and the end of the housing of the connector (41) is fixedly connected to the end of the connector port (42).

5. The integrated four-in-one testing instrument for power distribution network inspection according to claim 4, characterized in that: The connector (41) includes a handle (411) and an elastic block (4110). The handle (411) is slidably connected to the groove on the side of the connector (41) housing. The end of the handle (411) is fixedly connected to the end of the elastic block (4110).

6. The integrated four-in-one testing instrument for power distribution network inspection according to claim 4, characterized in that: The plug-in port (42) includes: a plug plate (421) and a locking hole (422). The outer wall of the plug-in port (42) housing is fixedly connected to the end of the plug plate (421), and the locking hole (422) is opened in the middle of the plug plate (421).

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