Mutual inductor secondary circuit wiring inspection device with stay wire hook

Abstract

The utility model relates to a mutual inductor secondary circuit wiring inspection device with a stay wire hook, which comprises a first shell and a second shell, a buzzer connected with a power supply is arranged in the first shell, and a through hole for accommodating the stay wire hook is arranged on the end face, far away from the first shell, of the second shell. A first conductor and a second conductor which are not connected with each other are further arranged on the edge of the end face, a spring is arranged in the second shell, the inner side of the spring is fixedly connected with the inner wall of the second shell, the outer side of the spring is fixedly connected with the tail end of the cable pulling hook, and a conduction plate is arranged at the connecting position of the cable pulling hook and the spring. And the conduction plate is in contact with the first conductor and the second conductor, and the buzzer is electrified and sounds. According to the utility model, whether the terminal of the mutual inductor has virtual connection or not is judged by acquiring the image of the terminal wiring position of the mutual inductor, measuring the temperature of the terminal of the mutual inductor, pulling the terminal cable by using the wire pulling hook and the like, so that the reliability of checking the terminal of the mutual inductor is improved, and the convenience is increased.

Description

Technical Field

[0001] This utility model belongs to the field of power cable testing, specifically relating to a device for inspecting the secondary circuit wiring of a current transformer with a pull hook. Background Art

[0002] A current transformer is an instrument that measures current by converting a large primary current into a small secondary current based on the principle of electromagnetic induction. Under normal operation, the secondary side of the transformer is in a near-short-circuit state, resulting in a very low output voltage. If the secondary winding of a current transformer becomes open-circuited during operation, it can generate overvoltages of several thousand volts or even tens of thousands of volts on the secondary side. This can not only damage the insulation of the secondary side but also potentially burn out the transformer and even endanger the lives of operating personnel.

[0003] Therefore, it is essential to regularly inspect the secondary circuit wiring of current transformers to ensure that the transformer terminal connections are secure and reliable. Common methods for inspecting the secondary circuit wiring of current transformers include direct manual observation and measurement of the temperature of the secondary terminal connections. However, the wiring areas of terminal blocks are often in confined spaces with blind spots, making it impossible for inspectors to directly observe the connection between the terminals and cables. Furthermore, the limited space also makes it difficult to measure the temperature of the secondary terminal connections. Utility Model Content

[0004] The purpose of this invention is to address the aforementioned problems by providing a current transformer secondary circuit wiring inspection device with a pull hook, integrating a camera and an infrared temperature measurement module. It employs multiple methods to determine whether there are loose connections at the current transformer terminals, thereby improving the reliability of current transformer terminal inspection and ensuring the safety of inspection personnel.

[0005] To achieve the above objectives, the technical solution of this utility model is as follows:

[0006] A secondary circuit wiring inspection device for a current transformer with a pull hook includes a first housing and a second housing. The first housing contains a buzzer connected to a power source. The end face of the second housing furthest from the first housing has a through hole for accommodating the pull hook. A first conductor and a second conductor, which are not connected, are also located on the edge of this end face. A spring is located inside the second housing. The inner side of the spring is fixedly connected to the inner wall of the second housing, and the outer side of the spring is fixedly connected to the end of the pull hook. A conductive plate is provided at the connection point between the pull hook and the spring. The area of ​​the conductive plate is smaller than the cross-sectional area of ​​the second housing. One terminal of the buzzer is electrically connected to the second conductor, and the other terminal of the buzzer is electrically connected to the first lead of the power source. The second lead of the power source is electrically connected to the first conductor. When the pull hook catches the cable and is pulled by the cable, the outer side of the spring is stretched outward to the outer end face of the second housing. The conductive plate contacts the first and second conductors, and the buzzer, the first conductor, the second conductor, the conductive plate, and the power source form a conductive circuit. The buzzer is energized and emits a sound.

[0007] Preferably, a switch is provided on the first housing, and the first lead of the power supply is electrically connected to the buzzer via the switch.

[0008] Preferably, the first housing, the second housing, and the pull hook are all made of insulating plastic.

[0009] Preferably, the first housing is provided with an infrared temperature measurement module connected to a power supply via a switch.

[0010] Preferably, the first housing is provided with a camera module connected to a power source via a switch, and the camera module is connected to a mobile terminal via a wireless network.

[0011] Preferably, the first housing is provided with a lighting lamp connected to a power source via a switch.

[0012] Preferably, the power source is a dry cell battery or a lithium battery.

[0013] Preferably, the first housing is provided with a battery compartment for storing power, the positive terminal of the battery compartment is electrically connected to the positive terminal of the buzzer via a switch, the negative terminal of the buzzer is electrically connected to the second conductor, and the negative terminal of the battery compartment is electrically connected to the first conductor.

[0014] Compared with the prior art, the beneficial effects of this utility model include:

[0015] 1) This utility model improves the reliability and convenience of current transformer terminal inspection by using multiple methods such as collecting images of the current transformer terminal wiring points, measuring the temperature of the current transformer terminals, and pulling the cable at the current transformer terminal parts with a pull hook to determine whether there is a loose connection at the current transformer terminals.

[0016] 2) This utility model is small and portable, making it easy to collect images of the terminal wiring of the current transformer in a relatively small space for observation and judgment of whether the terminal wiring of the current transformer is secure and whether there is any abnormality in the current transformer terminals.

[0017] 3) This utility model can measure the temperature of the current transformer terminals through an infrared temperature measurement module, and determine whether the current transformer terminals are too hot and have poor contact by infrared temperature measurement.

[0018] 4) This utility model can determine whether the terminal wiring is secure by gently pulling the cable at the terminal of the current transformer through the pull hook at its end. When the wiring is secure, the buzzer sounds to confirm that the wiring is secure. It is convenient, practical and reliable. The housing and pull hook of this utility model are made of insulating materials, which can prevent the inspectors from being electrocuted and ensure safety. Attached Figure Description

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0020] Figure 1This is a schematic diagram of the structure of the instrument transformer secondary circuit wiring inspection device with pull hook according to the present invention.

[0021] Figure 2 This is a schematic diagram of the structure of the pull hook of this utility model.

[0022] Figure 3 This is a circuit diagram of the camera module of this utility model.

[0023] Figure 4 This is the circuit diagram of the infrared temperature measurement module of this utility model.

[0024] Figure 5 This is a circuit diagram of the boost circuit of this utility model.

[0025] Explanation of reference numerals in the attached drawings: 1. First housing; 2. Second housing; 3. Camera module; 4. Infrared temperature measurement module; 5. Battery compartment; 6. Switch; 7. Buzzer; 8. Lighting lamp; 9. Spring; 10. First conductor; 11. Second conductor; 12. Conductor plate; 13. Pull hook. Detailed Implementation

[0026] like Figure 1 and Figure 2 As shown, the instrument transformer secondary circuit wiring inspection device with pull hook includes a first housing 1 and a second housing 2. The first housing 1 is equipped with a buzzer 7 connected to the power supply. The end face of the second housing 2 away from the first housing is provided with a through hole for accommodating the pull hook 13. The edge of this end face is also provided with a first conductor 10 and a second conductor 11 that are not connected to each other. The second housing is equipped with a spring 9. The inner side of the spring 9 is fixedly connected to the inner wall of the second housing, and the outer side of the spring 9 is fixedly connected to the end of the pull hook 13. A conductive plate 12 is provided at the connection part between the pull hook 13 and the spring 9. The area of ​​the conductive plate 12 is smaller than the cross-sectional area of ​​the second housing. One terminal of the buzzer 7 is electrically connected to the second conductor 11, and the other terminal of the buzzer 7 is electrically connected to the first lead of the power supply. The second lead of the power supply is electrically connected to the first conductor 10.

[0027] When the pull hook catches the cable and is pulled by the cable, the outer side of the spring 9 is stretched outward to the outer end face of the second housing, and the conductive plate 12 contacts the first conductor 10 and the second conductor 11. The buzzer 7, the first conductor 10, the second conductor 11, the conductive plate 12 and the power supply form a conductive circuit.

[0028] The first housing 1 is equipped with a switch 6, and the first lead of the power supply is electrically connected to the buzzer 7 via the switch 6. The first housing 1 is equipped with a camera module 3, an infrared temperature measurement module 4, and a lighting lamp 8, which are connected to the power supply via the switch 6.

[0029] In this embodiment, the first housing 1, the second housing 2, and the pull hook 13 are all made of insulating plastic. The first housing 1 is provided with a battery compartment 5 for storing power. The positive terminal of the battery compartment is electrically connected to the positive terminal of the buzzer 7 via a switch 6. The negative terminal of the buzzer 7 is electrically connected to the second conductor 11. The negative terminal of the battery compartment is electrically connected to the first conductor 10.

[0030] In this embodiment, the camera module 3 is model ESP32-CAM, which has a built-in 802.11b / g / n Wi-Fi + BT / BLESoC wireless communication module. The camera module 3 uses an OV7670CSP2 integrated chip, and its circuitry is as follows... Figure 3 As shown.

[0031] Infrared temperature measurement module 4 uses the MLX90614 chip, and its circuit is as follows: Figure 4 As shown.

[0032] In this embodiment, the power supply in the battery compartment 5 is a 3.3V lithium battery. The output voltage is boosted to 5V via a boost circuit to power the camera module 3. The boost circuit for the lithium battery is as follows: Figure 5 As shown.

[0033] The working principle is as follows:

[0034] When it is necessary to observe and measure the temperature of the transformer terminal wiring in a confined space, move the first housing 1 to the vicinity of the terminal to be observed, align the camera module 3 and infrared temperature measurement module 4 with the terminal wiring, and simultaneously turn the switch knob 6 to "on". The camera module 3 and infrared temperature measurement module 4 are powered on at the same time, and the lighting lamp 8 is turned on. The camera module 3 and infrared temperature measurement module 4 transmit the image signal and temperature signal of the terminal wiring to the mobile terminal via wireless network. After completing the observation and temperature measurement of the terminal wiring, turn the switch 6 to "off" to save power.

[0035] When checking for loose connections in the current transformer terminal cables, use the pull hook 13 to hook the cable to be checked and gently pull it outwards. If the terminal cable is securely connected, the spring 9 connected to the pull hook 13 will be stretched, and the conductive plate 12 will simultaneously contact the first conductor 10 and the second conductor 11. At this time, the positive terminal of the buzzer 7 will be connected to the positive terminal of the battery compartment 5, and the buzzer 7 will be energized and emit a sound to remind the inspector that the current transformer terminal connection is secure. If the current transformer terminal cable is loosely connected, the pull hook 13 will pull the current transformer terminal cable being checked out of the terminal. The force on the spring 9 connected to the pull hook 13 will not be sufficient to make the conductive plate 12 contact the first conductor 10 and the second conductor 11, and the buzzer 7 will not be energized and will not emit a sound.

Claims

1. A device for inspecting the secondary circuit wiring of a current transformer with a pull hook, comprising a first housing (1), characterized in that, The first housing (1) is equipped with a buzzer (7) connected to the power supply. The transformer secondary circuit wiring inspection device also includes a second housing (2) fixedly connected to the first housing. The end face of the second housing away from the first housing is provided with a through hole for accommodating a pull hook (13). The edge of the end face is also provided with a first conductor (10) and a second conductor (11) that are not connected to each other. The second housing is provided with a spring (9), the inner side of the spring (9) is fixedly connected to the inner wall of the second housing, the outer side of the spring (9) is fixedly connected to the end of the pull hook (13), and a guide plate (12) is provided at the connection between the pull hook (13) and the spring (9). One terminal of the buzzer (7) is electrically connected to the second conductor (11), the other terminal of the buzzer (7) is electrically connected to the first lead of the power supply, and the second lead of the power supply is electrically connected to the first conductor (10). When the pull hook catches the cable and is pulled by the cable, the outer side of the spring (9) is stretched outward to the outer end face of the second housing. The conductive plate (12) contacts the first conductor (10) and the second conductor (11). The buzzer (7), the first conductor (10), the second conductor (11), the conductive plate (12) and the power supply form a conductive circuit. The buzzer is powered on and emits a sound.

2. The instrument for checking the secondary circuit wiring of a current transformer with a pull hook according to claim 1, characterized in that, The first housing (1) is equipped with a switch (6), and the first lead of the power supply is electrically connected to the buzzer (7) via the switch (6).

3. The instrument transformer secondary circuit wiring inspection device with pull hook according to claim 2, characterized in that, The first housing (1) is equipped with an infrared temperature measurement module (4) connected to the power supply via a switch (6).

4. The instrument transformer secondary circuit wiring inspection device with pull hook according to claim 2, characterized in that, The first housing (1) is equipped with a camera module (3) connected to the power supply via a switch (6).

5. The instrument transformer secondary circuit wiring inspection device with pull hook according to claim 2, characterized in that, The first housing (1) is equipped with a lighting lamp (8) connected to a power source via a switch (6).

6. The instrument for checking the secondary circuit wiring of a current transformer with a pull hook according to claim 2, 3, 4, or 5, characterized in that, The power source is a dry cell battery or a lithium battery.

7. The instrument transformer secondary circuit wiring inspection device with pull hook according to claim 6, characterized in that, The first housing (1) is provided with a battery compartment (5) for storing power. The positive terminal of the battery compartment is electrically connected to the positive terminal of the buzzer (7) via a switch (6). The negative terminal of the buzzer (7) is electrically connected to the second conductor (11). The negative terminal of the battery compartment is electrically connected to the first conductor (10).

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