Current transformer with temperature measurement function

Abstract

This invention relates to a current transformer with temperature measurement function in the field of current transformer technology. It includes a current transformer body, with the cable being measured passing through a central hole in the body. A temperature sensor for temperature measurement is mounted on the current transformer body. An auxiliary temperature measurement assembly is located at the bottom front side of the current transformer body. This assembly includes a housing fixed to the front side of the current transformer body and communicating with its interior. A fan is located on the side of the housing away from the current transformer body. The temperature sensor's probe is inserted into the housing. The fan drives airflow within the current transformer body through the probe to measure the internal temperature. A front support plate located at the bottom of the cable is fixed to the front end of the current transformer body. The temperature probe is inserted into the front support plate and contacts the cable to measure its temperature. This invention solves the problem of low detection accuracy in current transformers with temperature measurement function.

Description

Technical Field

[0001] This invention relates to the field of current transformer technology, and in particular to a current transformer with temperature measurement function. Background Technology

[0002] A current transformer is an instrument that converts a large primary current into a small secondary current based on the principle of electromagnetic induction for measurement, thereby facilitating the safe operation of measuring and protecting equipment. The working principle of a current transformer is based on the law of electromagnetic induction. When current flows through a cable, a magnetic field is generated in the iron core of the current transformer, inducing a current in the secondary winding. Therefore, when using a current transformer, the cable being measured must pass through the center hole of the current transformer; otherwise, the magnetic field generated by the cable cannot be effectively captured by the iron core of the current transformer, thus affecting the measurement accuracy.

[0003] Temperature sensors are typically installed on current transformers to monitor their operating temperature, which is crucial for ensuring the performance of the current transformer and extending its service life. The main installation methods for temperature sensors are:

[0004] 1. The temperature sensor is installed inside the housing of a current transformer, such as the current transformer with a temperature measuring device described in prior art publication CN106601457A. The problem with this installation method is that the sealed housing of the current transformer hinders heat dissipation from the temperature sensor, and the heat generated by the temperature sensor operating inside the sealed housing can easily affect the detection accuracy.

[0005] 2. Installing the temperature sensor on the surface of the current transformer housing. Examples include a current transformer temperature intelligent monitoring device (publication number CN217980589U) and a current transformer surface operating temperature monitoring device (publication number CN207423407U). The problems with this installation method are: firstly, the isolation effect of the current transformer housing causes a large error between the housing surface and the interior, reducing detection accuracy; secondly, the temperature sensor is greatly affected by environmental factors, further reducing detection accuracy. Summary of the Invention

[0006] To address the problem of low detection accuracy in current current transformers with temperature measurement functions, this invention provides the following technical solution:

[0007] A current transformer with temperature measurement function includes a current transformer body, the cable to be measured passes through the central hole of the current transformer body, and a temperature sensor for temperature measurement is provided on the current transformer body.

[0008] An auxiliary temperature measuring component is provided at the bottom front side of the current transformer body, and a driving component is provided at the top of the auxiliary temperature measuring component on the front side of the current transformer body. This is used to assist the temperature sensor in measuring the temperature of the current transformer body and the cable. The auxiliary temperature measuring component includes a housing fixed to the front side of the current transformer body and communicating with the interior of the current transformer body. A fan is provided on the side of the housing away from the current transformer body. The temperature measuring probe of the temperature sensor is inserted into the housing. The fan drives the air inside the current transformer body to flow through the temperature measuring probe to measure the internal temperature of the current transformer body.

[0009] The front end of the current transformer body is fixed with a front support plate located at the bottom of the cable for supporting the cable. The temperature probe is inserted into the front support plate and contacts the cable to measure the cable temperature.

[0010] This invention combines the functions of measuring the internal temperature of the current transformer body and the temperature of the cable.

[0011] Furthermore, a mounting cover is fixed to the outside of the fan. The housing and the mounting cover are connected by a pipe, and a one-way valve is installed on the pipe, which only allows air to enter the mounting cover from the housing. The side of the mounting cover away from the pipe is connected to the current transformer body through a connecting pipe, and the connecting pipe also supports the housing and the mounting cover from below. The air inlet of the fan faces the pipe, and the air outlet of the fan faces the connecting pipe. When the fan works, the air inside the current transformer body flows back into the current transformer body after being cooled by the housing, pipe, mounting cover and connecting pipe, which facilitates temperature measurement and heat dissipation inside the current transformer body.

[0012] Furthermore, the top of the housing has an opening for the temperature probe to pass through, and a sealing element is provided inside the housing below the opening; the sealing element includes an outer plate fixed to the inner wall of the housing, and a through-hole is provided on the outer plate at the bottom of the opening, and sealing plates are provided on both sides of the through-hole. The two sealing plates extend into the outer plate from the opposite side, and the two sealing plates are connected to the inner wall of the outer plate by a spring. The top of the sealing plates on the side that is close to each other is machined into an inclined surface; after the temperature probe is inserted into the housing through the opening, it contacts the inclined surface of the sealing plate. The temperature probe moves down and pushes the two sealing plates apart to allow the temperature probe to enter the housing.

[0013] Furthermore, an insulating sleeve is fixed to the outer wall of the temperature probe. The insulating sleeve protrudes outward on both sides of the temperature probe to form two guide grooves, one of which has a conductive post fixed inside. Conductive posts and guide posts are fixed to the top of the housing on both sides of the opening. After the temperature probe enters the housing, the conductive posts and guide posts are inserted into the two guide grooves respectively, and the conductive posts contact the conductive post, so that the circuit of the temperature sensor and the fan is connected, and the temperature probe and the fan work simultaneously to measure the temperature.

[0014] Furthermore, the driving component includes a ring located on the front side of the current transformer body, a connecting plate fixed to the bottom of the ring, and both the ring and the connecting plate are located on the rear side of the temperature probe. The connecting plate has a rotating shaft inside, and the front end of the rotating shaft is connected to the rear end of the temperature probe. An electric push rod for driving the ring to rise and fall is fixed on the top of the front side of the current transformer body, which facilitates driving the temperature probe to move.

[0015] Furthermore, a support plate is fixedly provided at the top of the housing and on the rear side of the ring for supporting the cable, and the support plate is connected to the end of the rotating shaft away from the temperature probe for transmission so as to facilitate the reversal of the temperature probe.

[0016] Furthermore, the front support plate is fixed to the top of the support plate, and the front support plate has a through-hole that passes through the front support plate and is located at the bottom end of the cable. Guide rods and conductive rods are fixed on both sides of the through-hole at the bottom end of the front support plate. After reversal, the temperature probe enters the through-hole and contacts the cable. At the same time, the guide rod and conductive rod are inserted into two guide grooves, and the conductive rod contacts the conductive terminal, so that the circuit where the temperature sensor is located is connected, and the temperature probe works to measure the temperature of the cable.

[0017] Furthermore, when the current transformer body and cable are not measuring temperature, the temperature probe is located between the front support plate and the housing, and the temperature sensor is in a closed state to reduce energy consumption.

[0018] Furthermore, a rear support plate located at the bottom of the cable is fixed to the rear end of the current transformer body, and a cable fixing device is provided on the inner wall of the central hole of the current transformer body. The cable fixing device, together with the front support plate and the rear support plate, clamps and fixes the cable to avoid the cable position displacement affecting its measurement results.

[0019] Compared with the prior art, the beneficial effects of the present invention are:

[0020] 1. The temperature measurement structure of this invention is located outside the current transformer body, which not only facilitates maintenance but also serves as a temperature measurement function for both the inside of the current transformer body and the cable. Furthermore, the temperature sensor is always in a newly activated state for each measurement, and each measurement is completed within a very short time. Therefore, the heat generated by the temperature sensor of this invention is significantly less than that generated by the traditional method of placing the temperature sensor inside the current transformer body for real-time operation. This greatly reduces the impact of the temperature sensor's own heat on the detection accuracy, resulting in high measurement accuracy. Simultaneously, it facilitates intermittent temperature measurement throughout the day, reducing energy consumption and saving costs.

[0021] 2. In this invention, when measuring the temperature inside the current transformer body, the air inside the current transformer body is driven to flow through and surround the temperature measuring probe. This allows the air to exchange heat with the outside air and cool down before flowing back into the current transformer body. This facilitates heat dissipation of the current transformer body, prevents thermal failures of the current transformer, and ensures the safe operation of the current transformer. Attached Figure Description

[0022] Figure 1 This is an overall structural diagram of the present invention;

[0023] Figure 2 This is a structural diagram of the back of the current transformer body of the present invention;

[0024] Figure 3 This is a cross-sectional view of the present invention;

[0025] Figure 4 for Figure 3 Mid-section structural diagram;

[0026] Figure 5 This is a structural diagram of the sealing component of the present invention;

[0027] Figure 6 This is a side sectional view of the auxiliary temperature measuring component of the present invention;

[0028] Figure 7 This is a partial structural diagram of the auxiliary temperature measuring component, driving component, and front support plate of the present invention;

[0029] Figure 8 This is a partial structural diagram of the auxiliary temperature measurement component and driving element of the present invention;

[0030] Figure 9 This is a schematic diagram of temperature measurement according to the present invention. Figure 1 ;

[0031] Figure 10 This is a schematic diagram of temperature measurement according to the present invention. Figure 2 ;

[0032] Figure 11 This is a schematic diagram of temperature measurement according to the present invention. Figure 3 ;

[0033] Figure 12 This is a schematic diagram of temperature measurement according to the present invention. Figure 4 ;

[0034] Figure 13 This is a schematic diagram of temperature measurement according to the present invention. Figure 5 ;

[0035] Figure 14 This is a circuit diagram showing the conductive terminal, fan, conductive post, conductive rod, and temperature sensor of the present invention.

[0036] The following is a list of component names represented by the various reference numerals in the attached figures:

[0037] 1 Current transformer body, 2 Cable, 3 Temperature probe, 31 Insulating sleeve, 32 Guide groove, 33 Conductive terminal;

[0038] 4 Auxiliary temperature measuring components, 41 Housing, 42 Mounting cover, 43 Pipe, 44 Fan, 45 Connecting pipe, 46 Sealing component, 47 Conductive post, 48 Guide post, 461 Outer plate, 462 Sealing plate, 463 Spring, 464 Through-hole;

[0039] 5. Drive component, 51. Ring, 52. Connecting plate, 53. Rotating shaft, 54. Electric push rod, 55. Support plate;

[0040] 6. Front support plate, 61. Through port, 62. Guide rod, 63. Conductive rod;

[0041] 7. Rear support plate. Detailed Implementation

[0042] The preferred embodiments of the present invention are described in detail below, and a clear and complete description is provided in conjunction with the accompanying drawings.

[0043] like Figures 1-3 As shown, this invention provides a current transformer with temperature measurement function, including a current transformer body 1. A cable 2 passes through the central hole of the current transformer body 1 and needs to be fixed to avoid the cable 2's position shift affecting the measurement results. Therefore, this invention fixes a front support plate 6 and a rear support plate 7 at the front and rear ends of the current transformer body 1, respectively. The cable 2 is placed on the top of the front support plate 6 and the rear support plate 7. A cable fixing device is provided on the inner wall of the central hole of the current transformer body 1. The cable fixing device, together with the front support plate 6 and the rear support plate 7, clamps and fixes the cable 2. The cable fixing device adopts an existing device, such as the fixing structure in the cable-fixed current transformer disclosed in CN201629222U, which will not be described in detail in this invention.

[0044] This invention includes a temperature sensor for temperature measurement on the main body 1 of the current transformer. A split-type temperature sensor is selected, characterized by the separation of the sensor portion and the signal processing portion. The temperature sensor's probe 3 is designed as follows: Figure 4 As shown, an insulating sleeve plate 31 is fixed on the outer wall of the temperature probe 3. The insulating sleeve plate 31 protrudes outward on both sides of the temperature probe 3 to form two guide grooves 32. A conductive terminal 33 is fixed inside one of the guide grooves 32.

[0045] Next, as Figure 1 and Figures 3-6As shown, an auxiliary temperature measuring component 4 is provided at the bottom front side of the current transformer body 1. The auxiliary temperature measuring component 4 includes a housing 41 fixed to the front side of the current transformer body 1 and communicating with the interior of the current transformer body 1. The temperature inside the housing 41 is the same as that inside the current transformer body 1. A mounting cover 42 is provided on the side of the housing 41 away from the current transformer body 1. A fan 44 is fixed inside the mounting cover 42. The housing 41 and the mounting cover 42 are connected by a pipe 43. A one-way valve that only allows air to enter the mounting cover 42 from the housing 41 is installed on the pipe 43. The side of the mounting cover 42 away from the pipe 43 is connected to the current transformer body 1 by a connecting pipe 45. The connecting pipe 45 also supports the housing 41 and the mounting cover 42 from below. The air inlet of the fan 44 faces the pipe 43, and the air outlet of the fan 44 faces the connecting pipe 45.

[0046] Moreover, such as Figure 1 and Figures 3-8 As shown, a driving component 5 is provided on the front side of the current transformer body 1 at the top of the auxiliary temperature measuring component 4. The driving component 5 includes a ring 51 located on the front side of the current transformer body 1. A connecting plate 52 is fixed to the bottom of the ring 51. Both the ring 51 and the connecting plate 52 are located on the rear side of the temperature measuring probe 3. A rotating shaft 53 is provided inside the connecting plate 52. The front end of the rotating shaft 53 is connected to the rear end of the temperature measuring probe 3. The rotating shaft 53 can be a damping rotating shaft, which is the rotating shaft used in the screen of a laptop computer. It can make the screen stay stably in the current position. Using a damping rotating shaft can prevent the temperature measuring probe 3 from rotating randomly.

[0047] An electric actuator 54 for driving the ring 51 to rise and fall is fixed to the top front side of the current transformer body 1. The electric actuator 54 can be a Jiechang JC35KC. This electric actuator is compact in size, has powerful thrust, can be used in many fields, operates smoothly, has very low noise, has a high protection level, and can be used both indoors and outdoors. Compared with hydraulic systems, it is much cheaper, has low maintenance costs, and is simple and convenient to install. Furthermore, a slide rail can be installed between the cable 2 and the current transformer body 1 to guide the vertical movement of the ring 51.

[0048] An opening for the temperature probe 3 to pass through is provided at the top of the housing 41. Conductive posts 47 and guide posts 48 are fixed on either side of the opening at the top of the housing 41. The temperature probe 3 is driven downwards by an electric push rod 54, and then inserted into the housing 41 through the opening. A sealing element 46 is provided below the opening inside the housing 41 to seal the housing 41 after the temperature probe 3 has left it. Figures 4-5As shown, the sealing member 46 includes an outer plate 461 fixed to the inner wall of the housing 41. A through-hole 464 is provided on the outer plate 461 at the bottom of the opening, and sealing plates 462 are provided on both inner side walls of the through-hole 464. The two sealing plates 462 extend into the outer plate 461 on the side that is far apart, and the two sealing plates 462 are connected to the inner wall of the outer plate 461 by springs 463 on the side that is far apart. The top of the sealing plates 462 on the side that is close to each other is processed into an inclined surface.

[0049] After the temperature probe 3 is inserted into the housing 41, it first contacts the inclined surface of the sealing plate 462. The temperature probe 3 continues to move downwards, pushing the two sealing plates 462 apart to allow the temperature probe 3 to enter the housing 41 until the insulating sleeve 31 contacts the top of the housing 41. At this point, the conductive post 47 and the guide post 48 enter the guide groove 32, and the conductive post 47 aligns with the conductive connector 33. Figure 14 As shown, at this time, the circuit where the temperature sensor and fan 44 are located is connected, and the temperature probe 3 and fan 44 work simultaneously. The fan 44 drives the air inside the current transformer body 1 to enter the mounting cover 42 through the housing 41 and pipe 43. The air inside the current transformer body 1 flows through and surrounds the temperature probe 3. At this time, the temperature probe 3 measures the temperature inside the current transformer body 1. Then, the air inside the mounting cover 42 enters the connecting pipe 45 to exchange heat with the outside air and cool down before flowing back into the current transformer body 1, effectively dissipating heat from the current transformer body 1.

[0050] In practical use:

[0051] 1. To improve heat dissipation: The connecting pipe 45 can be made of a material with good thermal conductivity, and its length can be extended to increase the air heat exchange time, or a cooling device can be added to cool the air inside the connecting pipe 45. Since the decrease in internal temperature of the current transformer body 1 after heat dissipation will affect the temperature detection accuracy inside the current transformer body 1, the temperature probe 3 needs to enter the housing 41 at intervals to complete one detection and then exit the housing 41. Since the measurement time of the temperature sensor can be kept within a very short time, for example, the LTN50 series split electronic temperature sensor can be used. Its sensing type is PT100. The response time of the PT100 sensor itself is usually in the millisecond range, which means that it can respond to temperature changes within a few milliseconds. Therefore, a temperature detection can be completed before the air inside the current transformer body 1 flows back into the current transformer body 1.

[0052] II. In order to meet the sealing requirements:

[0053] A rubber sealing gasket can be pasted into the opening of the housing 41. A "I" or "+" shaped cut is made on the sealing gasket with a knife. The temperature probe 3 can pass through the cut to open the opening and facilitate the temperature probe 3 to enter the opening. At the same time, the sealing gasket seals the outer wall of the temperature probe 3 and the inner wall of the opening to reduce the influence of the temperature probe 3 on the external ambient temperature when measuring the temperature inside the housing 41. When the temperature probe 3 leaves the housing 41, the cut retracts, effectively sealing the opening. After the temperature probe 3 exits the housing 41, the elastic force of the spring 463 drives the two sealing plates 462 to move inward to close the through-hole 464. A sealing strip can be pasted on the outer periphery of the outer plate 461 to seal the gap between the outer plate 461 and the through-hole 464.

[0054] When using a current transformer to monitor cable 2, the current flowing through cable 2 causes it to heat up. If the temperature is too high, it can affect the current carrying capacity and service life of cable 2. Therefore, this invention can also monitor the temperature of cable 2 to prevent thermal failures and ensure its safe operation. Specifically, as... Figure 7-8 As shown, a through-hole 61 is provided on the front support plate 6, and the through-hole 61 is located at the bottom end of the cable 2. Guide rods 62 and conductive rods 63 are respectively fixed on both sides of the through-hole 61 at the bottom end of the front support plate 6.

[0055] A support plate 55 is fixedly provided at the top of the housing 41 and behind the ring 51. The support plate 55 is fixed to the bottom of the front support plate 6. The support plate 55 and the end of the rotating shaft 53 away from the temperature probe 3 are connected by a transmission to facilitate the reversal of the temperature probe 3. The reversal of the temperature probe 3 can be completed using the existing transmission structure. The present invention provides an example of the following transmission structure: a gear is fixed at the end of the rotating shaft 53 away from the temperature probe 3, and a rack that meshes with the gear is fixed inside the support plate 55. The rack has teeth machined only in a middle section.

[0056] The temperature probe 3 moves downward, causing the gear to disengage from the toothed part of the rack. Then, the bottom of the temperature probe 3 enters the opening of the housing 41. Figure 10 As shown; then the temperature probe 3 can be inserted into the housing 41 under the guidance of the opening. When the temperature probe 3 moves upward and exits the housing 41, the gear rotates along the teeth of the rack. After the temperature probe 3 rotates 180°, the upper end of the temperature probe 3 enters the through-hole 61, and the gear disengages from the toothed part of the rack, as shown. Figure 12 As shown; then the temperature probe 3 can be inserted into the port 61 under the guidance of the port 61.

[0057] The working principle of this invention is as follows:

[0058] Before temperature measurement, the state of temperature probe 3 is as follows: Figure 9As shown, during temperature measurement, the electric push rod 54 drives the ring 51 to move downwards, thereby moving the temperature probe 3 and the gear downwards. When the temperature probe 3 rotates 90° counterclockwise, the gear disengages from the toothed part of the rack, and then the bottom end of the temperature probe 3 inserts into the opening of the housing 41, as shown. Figure 10 As shown; then the temperature probe 3 moves down along the opening, pushing open the two sealing plates 462 and entering the housing 41 until the insulating sleeve 31 contacts the top of the housing 41. At this time, the conductive post 47 enters the guide groove 32 and connects with the conductive terminal 33, as shown. Figure 11 As shown, the circuit where the temperature sensor and fan 44 are located is connected. The temperature probe 3 and fan 44 work simultaneously. The fan 44 drives the air inside the current transformer body 1 to enter the mounting cover 42 through the housing 41. The air inside the current transformer body 1 flows through and surrounds the temperature probe 3. The temperature probe 3 measures the temperature inside the current transformer body 1. The temperature sensor displays and records a value. Then, the air inside the mounting cover 42 enters the connecting pipe 45 to exchange heat with the outside air and cool down before flowing back into the current transformer body 1. After one temperature measurement is completed, the electric push rod 54 drives the ring 51 to move upward and reset the temperature probe 3.

[0059] Before temperature measurement, the state of temperature probe 3 is as follows: Figure 9 As shown, during temperature measurement, the electric push rod 54 drives the ring 51 to move upward, thereby moving the temperature probe 3 and the gear upward. When the temperature probe 3 rotates 90° clockwise, the gear disengages from the toothed part of the rack, and then the tip of the temperature probe 3 is inserted into the opening 61. Figure 12 As shown; then the temperature probe 3 moves upward along the opening 61 until the insulating sleeve 31 contacts the bottom end of the front support plate 6 and the temperature probe 3 contacts the cable 2. At this time, the conductive rod 63 enters the guide groove 32 and connects with the conductive terminal 33, as shown. Figure 13 As shown, when the circuit of the temperature sensor is connected, the temperature probe 3 works to measure the temperature of the cable 2. The temperature sensor displays and records a value once. After one temperature measurement is completed, the electric push rod 54 drives the ring 51 to move down and reset the temperature probe 3.

[0060] During the 24 / 7 period, the current transformer body 1 and cable 2 can be detected at intervals. When the current transformer body 1 and cable 2 are not measuring temperature, the temperature probe 3 is positioned between the front support plate 6 and the housing 41, which disconnects the circuit of the temperature sensor, i.e., the temperature sensor is in the off state, so that the temperature sensor does not need to work around the clock, thereby reducing energy consumption.

[0061] Meanwhile, as is well known, electrical equipment begins to generate heat after operation. After running for a period of time, the equipment temperature no longer rises and stabilizes at a certain temperature. Therefore, in this invention, the temperature sensor is always in the newly turned-on state during each temperature measurement, and the time required for a single temperature measurement can be kept within a very short time. For example, the LTN50 series split electronic temperature sensor selected above can respond to temperature changes within a few milliseconds. Therefore, during the time the detection is completed, the heat generated by the temperature sensor of this invention is much smaller than the heat generated by the traditional method of placing the temperature sensor inside the current transformer body 1 for real-time operation. This greatly reduces the impact of the temperature sensor's own heat on the detection accuracy during temperature measurement.

[0062] Based on the above description and accompanying drawings, those skilled in the art can understand and implement this invention. Furthermore, any non-creative modifications made to this invention by those skilled in the art without inventive effort are still within the scope of protection of this invention.

Claims

1. A current transformer with temperature measurement function, comprising a current transformer body (1), wherein the cable (2) to be measured passes through the central hole of the current transformer body (1), characterized in that: The current transformer body (1) is equipped with a temperature sensor for temperature measurement; The current transformer body (1) has an auxiliary temperature measuring component (4) at the bottom front side, and a driving component (5) is provided on the top of the auxiliary temperature measuring component (4) at the front side of the current transformer body (1) for assisting the temperature sensor in measuring the temperature of the current transformer body (1) and the cable (2). The auxiliary temperature measuring component (4) includes a housing (41) fixed to the front side of the current transformer body (1) and communicating with the inside of the current transformer body (1). A fan (44) is provided on the side of the housing (41) away from the current transformer body (1). The temperature measuring probe (3) of the temperature sensor is inserted into the housing (41). The fan (44) drives the air inside the current transformer body (1) to flow through the temperature measuring probe (3) to measure the temperature inside the current transformer body (1). The front end of the current transformer body (1) is fixed with a front support plate (6) located at the bottom of the cable (2). The temperature probe (3) is inserted into the front support plate (6) and contacts the cable (2) to measure the temperature of the cable (2). The fan (44) is fixed with a mounting cover (42) on the outside. The housing (41) and the mounting cover (42) are connected by a pipe (43), and a one-way valve is installed on the pipe (43) that only allows air to enter the mounting cover (42) from the housing (41). The mounting cover (42) on the side away from the pipe (43) is connected to the current transformer body (1) through a connecting pipe (45), and the connecting pipe (45) also supports the housing (41) and the mounting cover (42) from below. The air inlet of the fan (44) faces the pipe (43), and the air outlet of the fan (44) faces the connecting pipe (45). The operation of the fan (44) drives the air inside the current transformer body (1) to flow back into the current transformer body (1) through the housing (41), pipe (43), mounting cover (42) and connecting pipe (45), which facilitates temperature measurement and heat dissipation inside the current transformer body (1).

2. A current transformer with temperature measurement function according to claim 1, characterized in that: The top of the housing (41) is provided with an opening for the temperature probe (3) to pass through, and a sealing element (46) is provided inside the housing (41) below the opening. The sealing component (46) includes an outer plate (461) fixed to the inner wall of the housing (41). A through-hole (464) is provided on the outer plate (461) at the bottom of the opening. Both sides of the through-hole (464) are provided with sealing plates (462). The two sealing plates (462) extend into the outer plate (461) on the side that is far apart. The two sealing plates (462) are connected to the inner wall of the outer plate (461) by springs (463) on the side that is close to each other. The top of the sealing plates (462) on the side that is close to each other is processed into an inclined surface. After the temperature probe (3) is inserted into the housing (41) through the opening, it contacts the inclined surface of the sealing plate (462). The temperature probe (3) moves down and pushes the two sealing plates (462) to both sides so that the temperature probe (3) enters the housing (41).

3. A current transformer with temperature measurement function according to claim 2, characterized in that: An insulating sleeve plate (31) is fixed on the outer wall of the temperature probe (3). The insulating sleeve plate (31) protrudes outward on both sides of the temperature probe (3) to form two guide grooves (32). A conductive terminal (33) is fixed inside one of the guide grooves (32). The top of the housing (41) is fixed with conductive posts (47) and guide posts (48) on both sides of the opening. After the temperature probe (3) enters the housing (41), the conductive posts (47) and guide posts (48) are inserted into the two guide slots (32) respectively, and the conductive posts (47) contact the conductive terminals (33) so that the circuit of the temperature sensor and the fan (44) is connected. The temperature probe (3) and the fan (44) work at the same time to measure the temperature.

4. A current transformer with temperature measurement function according to claim 1, characterized in that: The driving component (5) includes a ring (51) located on the front side of the current transformer body (1), a connecting plate (52) fixed at the bottom of the ring (51), and both the ring (51) and the connecting plate (52) are located on the rear side of the temperature probe (3). The connecting plate (52) has a rotating shaft (53) inside, and the front end of the rotating shaft (53) is connected to the rear end of the temperature probe (3). The front top of the current transformer body (1) is fixed with an electric push rod (54) for driving the ring (51) to rise and fall, which facilitates the movement of the temperature probe (3).

5. A current transformer with temperature measurement function according to claim 4, characterized in that: A support plate (55) is fixedly provided at the top of the housing (41) and behind the ring (51), and the support plate (55) is connected to the end of the rotating shaft (53) away from the temperature probe (3) for the temperature probe (3) to change direction.

6. A current transformer with temperature measurement function according to claim 5, characterized in that: The front support plate (6) is fixed to the top of the support plate (55). The front support plate (6) has a through opening (61) that passes through the front support plate (6) and the through opening (61) is located at the bottom end of the cable (2). The bottom end of the front support plate (6) is fixed with a guide rod (62) and a conductive rod (63) on both sides of the through opening (61). After reversal, the temperature probe (3) enters the port (61) and contacts the cable (2). At the same time, the guide rod (62) and the conductive rod (63) are inserted into the two guide slots (32) respectively, and the conductive rod (63) contacts the conductive terminal (33), so that the circuit where the temperature sensor is located is connected, and the temperature probe (3) works to measure the temperature of the cable (2).

7. A current transformer with temperature measurement function according to claim 6, characterized in that: When the current transformer body (1) and cable (2) are not measuring temperature, the temperature probe (3) is located between the front support plate (6) and the housing (41), and the temperature sensor is in the off state to reduce energy consumption.

8. A current transformer with temperature measurement function according to claim 1, characterized in that: The rear end of the current transformer body (1) is fixed with a rear support plate (7) located at the bottom of the cable (2). The inner wall of the central hole of the current transformer body (1) is provided with a cable fixing device. The cable fixing device, together with the front support plate (6) and the rear support plate (7), clamps and fixes the cable (2).

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