A portable frequency jump sensing monitor for low voltage cables

Abstract

The application discloses a movable frequency mutation sensing monitoring instrument for low-voltage cables, which comprises a support assembly, a locking assembly and a control assembly. The support assembly comprises a base, a support arranged on the base and a brake component arranged on the base. The locking assembly comprises a first monitoring ring arranged on the support, a second monitoring ring arranged on the support and a handle arranged on the first monitoring ring and the second monitoring ring respectively. The control assembly is arranged on the base. In order to be widely used for low-voltage cables, the transformer module is internally provided with a coil with adjustable transformation ratio and an adjusting contact, so that frequency measurement can be performed on low-voltage cables with a voltage of 220V to 35kV. In order to be remotely controlled, the control device is internally provided with a remote control module, a communication module and a driving module, so that remote data transmission and control are facilitated. In order to store data, the control device is internally provided with an information acquisition and storage module, so that power system frequency monitoring data can be collected and stored in real time.

Description

Technical Field

[0001] This invention relates to the technical field of frequency monitoring in power systems, and more particularly to a portable frequency change sensor for monitoring low-voltage cables. Background Technology

[0002] With the widespread integration of new energy sources into the power system and the extensive construction of new power systems, the stability of the power system, especially its frequency stability, will face severe challenges. Therefore, there is an urgent need to develop a device capable of monitoring the power system frequency and promptly measuring and responding to frequency fluctuations. However, due to the difficulty in operational stability and voltage control, it is inconvenient to measure the grid frequency in most high-voltage substations and cables of the power system. Furthermore, in low-voltage power systems, where voltage levels vary from 220V to 35kV, single-voltage-level frequency measuring instruments are impractical. Simultaneously, some substations are located in windy, sandy areas, or in remote mountainous and forested regions. After commissioning, due to meteorological and environmental factors, their mechanical structures and physical forms will experience severe wear and tear. Currently, on-site measurement methods such as manual observation, laser long-distance measurement, and infrared observation are commonly used, which cannot provide real-time monitoring, alarm, and rapid processing of power system frequency fluctuations. In highly automated substations, video monitoring is typically used to determine the opening and closing status of disconnecting switches, and based on this, to determine whether a sudden frequency change has occurred in the grid. However, video surveillance suffers from blind spots and limited coverage, leading to issues such as reduced image clarity, compromised image quality, and distorted footage in rainy, snowy, low-temperature, and low-pressure environments. This results in delayed video feeds, hindering the provision of effective data to power system dispatch centers. Furthermore, moisture, aging, and damage from heat and shock to the resistors in substation circuit breakers can cause malfunctions in the measurement system, potentially leading to short circuits on the substation busbars and compromising system safety. Therefore, developing a portable, mobile frequency surge monitoring device that can be widely used in low-voltage cables is crucial.

[0003] Currently, most frequency measuring instruments used for low-voltage cables are fixed instruments, installed 0.1m to 1m above the ground. There are insulating baffles between each busbar, and the staff need to remove the insulating baffles when taking measurements. This is difficult to operate, can easily cause safety hazards, and has a low success rate in wiring, which is time-consuming and labor-intensive. Summary of the Invention

[0004] The purpose of this section is to outline some aspects of embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of these documents; however, such simplifications or omissions should not be construed as limiting the scope of the invention.

[0005] In view of the problems existing in the mobile frequency change sensor monitoring device for low-voltage cables, the present invention is proposed.

[0006] Therefore, the object of the present invention is to provide a mobile frequency change sensor for monitoring low-voltage cables.

[0007] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a movable frequency change sensor monitoring instrument for low-voltage cables, comprising: a bracket assembly including a base, a support member disposed on the base, and a braking component disposed on the base; a locking assembly including a first monitoring ring disposed on the support member, a second monitoring ring disposed on the support member, and handles respectively disposed on the first monitoring ring and the second monitoring ring; and a control assembly disposed on the base.

[0008] As a preferred embodiment of the movable frequency change sensing and monitoring instrument for low-voltage cables described in this invention, the base is provided with a first guide rail groove and a second guide rail groove, the support member includes a first sleeve rod and a second sleeve rod respectively slidably connected in the first guide rail groove and the second guide rail groove, a third sleeve rod is slidably connected to the upper end of the first sleeve rod, a fourth sleeve rod is slidably connected to the second sleeve rod, and locking members are provided on the third sleeve rod and the fourth sleeve rod.

[0009] In a preferred embodiment of the movable frequency change sensor monitoring instrument for low-voltage cables described in this invention, the locking component includes a plug rod slidably connected to the third sleeve rod, a plurality of insertion holes equidistantly opened on the first sleeve rod, and a locking key disposed at the end of the plug rod.

[0010] The insertion rod has a groove, and an elastic element is provided between the key and the groove.

[0011] As a preferred embodiment of the portable frequency change sensor monitoring instrument for low-voltage cables described in this invention, the first monitoring ring includes a first monitoring housing connected to a handle, a first conductor disposed within the first monitoring housing, and a ring resistor disposed within the first monitoring housing. Two first conductors are provided, respectively disposed on both sides of the ring resistor, and wires are connected to both ends of the first conductors.

[0012] As a preferred embodiment of the movable frequency change sensor monitoring instrument for low-voltage cables described in this invention, the second monitoring ring includes a second monitoring housing and a second conductor disposed within the second monitoring housing. One end of the first conductor is convex, and one end of the second conductor is concave. The second conductor has one convex end and the other end is concave.

[0013] As a preferred embodiment of the movable frequency change sensor monitoring instrument for low-voltage cables described in this invention, wherein: a connecting rod is connected between the first monitoring ring and the handle, a connecting rod is also connected between the second monitoring ring and the handle, through holes are provided on the third and fourth sleeve rods for the connecting rods to pass through, and threaded rods are threadedly connected to the third and fourth sleeve rods.

[0014] As a preferred embodiment of the portable frequency change sensor monitoring instrument for low-voltage cables according to the present invention, the control component includes a drive module, a communication module, a remote control module, a power grid operation data monitoring module, and an information acquisition and storage module. The communication module is connected to the remote control module, the remote control module is connected to the drive module, and the drive module is connected to the power grid operation data monitoring module and the information acquisition and storage module.

[0015] As a preferred embodiment of the portable frequency change sensing and monitoring instrument for low-voltage cables described in this invention, a transformer module is provided on the base. The transformer module includes a voltage acquisition unit, a voltage measuring unit, a voltage phase angle measuring unit, a turns ratio coil, and a turns ratio adjusting contact. The voltage acquisition unit is connected to a first monitoring loop via a wire. The voltage measuring unit is connected to a frequency measurement and calculation module. The voltage phase angle measuring unit is connected to the voltage acquisition unit. The turns ratio coil connects the voltage acquisition unit and the voltage measuring unit. The turns ratio adjusting contact is connected to the turns ratio coil.

[0016] In a preferred embodiment of the movable frequency change sensing and monitoring instrument for low-voltage cables described in this invention, a sliding component is provided on the connecting rod.

[0017] The beneficial effects of this invention are: simple structure, clear and easy-to-understand principle, practical and convenient, easy to move and transport, high safety, strong stability, remote control measurement, and real-time measurement monitoring, data storage and protection. For ease of movement, this invention uses rollers with brake pads; for wide applicability to low-voltage cables, the transformer module is equipped with an adjustable ratio coil and adjusting contacts, enabling frequency measurement on low-voltage cables from 220V to 35kV; for remote control, the control device includes a remote control module, a communication module, and a drive module for convenient remote data transmission and control; and for data storage, the control device includes an information acquisition and storage module for real-time acquisition and storage of power system frequency monitoring data. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Wherein:

[0019] Figure 1 This is a schematic diagram of the overall structure of the portable frequency change sensor monitoring instrument for low-voltage cables according to the present invention.

[0020] Figure 2 This is a schematic diagram showing the connection between the first monitoring ring and the second monitoring ring of the movable frequency change sensor monitoring instrument for low-voltage cables according to the present invention.

[0021] Figure 3 This is a schematic diagram of the locking component structure of the movable frequency change sensor monitoring instrument for low-voltage cables according to the present invention.

[0022] Figure 4 This is a schematic diagram of the control component structure of the movable frequency change sensor monitoring instrument for low-voltage cables according to the present invention.

[0023] Figure 5 This is a schematic diagram of the connection structure between the sliding component and the base of the movable frequency change sensing and monitoring instrument for low-voltage cables according to the present invention.

[0024] Figure 6 This is a schematic diagram of the sliding component of the movable frequency change sensing and monitoring instrument for low-voltage cables according to the present invention. Detailed Implementation

[0025] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0026] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0027] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that is mutually exclusive with other embodiments.

[0028] Secondly, the present invention is described in detail with reference to the schematic diagrams. When detailing the embodiments of the present invention, for ease of explanation, the cross-sectional views illustrating the device structure may be partially enlarged, not according to the usual scale. Furthermore, the schematic diagrams are merely examples and should not limit the scope of protection of the present invention. In addition, actual fabrication should include three-dimensional spatial dimensions of length, width, and depth.

[0029] Example 1

[0030] Reference Figure 1-4 This invention discloses a movable frequency change sensor monitoring instrument for low-voltage cables, comprising: a support assembly 100, including a base 101, a support member 102 disposed on the base 101, and a braking member 103 disposed on the base 101; a locking assembly 200, including a first monitoring ring 201 disposed on the support member 102, a second monitoring ring 202 disposed on the support member 102, and handles 203 respectively disposed on the first monitoring ring 201 and the second monitoring ring 202; and a control assembly 5. 00, The control component 500 is mounted on the base 101. The base 101 has a first guide rail groove 204 and a second guide rail groove 205. The support member 102 includes a first sleeve rod 102a and a second sleeve rod 102b that are slidably connected in the first guide rail groove 204 and the second guide rail groove 205, respectively. A third sleeve rod 102c is slidably connected to the upper end of the first sleeve rod 102a. A fourth sleeve rod 102d is slidably connected to the second sleeve rod 102b. Locking members 300 are provided on the third sleeve rod 102c and the fourth sleeve rod 102d.

[0031] The locking component 300 includes a plug rod 301 slidably connected to the third sleeve rod 102c, a plurality of insertion holes 302 equidistantly opened on the first sleeve rod 102a, and a locking key 303 disposed at the end of the plug rod 301. A groove is provided on the plug rod 301, and an elastic element 708304 is disposed between the locking key 303 and the groove. The first monitoring ring 201 includes a first monitoring housing 400 connected to the handle 203, a first conductor 401 disposed within the first monitoring housing 400, and a ring resistor 402 disposed within the first monitoring housing 400. Two first conductors 401 are provided, respectively disposed on both sides of the ring resistor 402, and the two ends of the first conductor 401 are connected to conductive... Line 403, the second monitoring ring 202 includes a second monitoring housing 404 and a second conductor 405 disposed inside the second monitoring housing 404. One end of the first conductor 401 is convex and one end of the second conductor 405 is concave. One end of the second conductor 405 is convex and the other end is concave. A connecting rod 406 is connected between the first monitoring ring 201 and the handle 203. A connecting rod 406 is also connected between the second monitoring ring 202 and the handle 203. The third sleeve rod 102c and the fourth sleeve rod 102d are provided with through holes for the connecting rod 406 to pass through. Threaded rods 407 are threadedly connected to the third sleeve rod 102c and the fourth sleeve rod 102d.

[0032] Furthermore, the control component 500 includes a drive module 501, a communication module 502, a remote control module 503, a power grid operation data monitoring module 504, and an information acquisition and storage module 505. The communication module 502 is connected to the remote control module 503, the remote control module 503 is connected to the drive module 501, and the drive module 501 is connected to the power grid operation data monitoring module 504 and the information acquisition and storage module 505. A transformer module 600 is provided on the base 101. The transformer module 600 includes a voltage acquisition device 601, a voltage measuring device 602, a voltage phase angle measuring instrument 603, a turns ratio coil 604, and a turns ratio adjusting contact 605. The voltage acquisition device 601 is connected to the first monitoring loop 201 through a wire 403. The voltage measuring device 602 is connected to the frequency measurement and calculation module. The voltage phase angle measuring instrument 603 is connected to the voltage acquisition device 601. The turns ratio coil 604 is connected to the voltage acquisition device 601 and the voltage measuring device 602. The turns ratio adjusting contact 605 is connected to the turns ratio coil 604.

[0033] In this embodiment, the base 101 is used to fix the first guide rail groove 204 and the second guide rail groove 205. The roller is fixed below the base 101 and is used to move the base 101. The brake pad is used to lock the roller to limit its rotation. The first sleeve rod 102a is used to drive the third sleeve rod 102c connected to it and the first monitoring ring 201 to move left and right on the first guide rail groove 204 in a direction parallel to the base 101. The second sleeve rod 102b is used to drive the fourth sleeve rod 102d connected to it and the second monitoring ring 202 to move left and right on the second guide rail groove 205 in a direction parallel to the base 101. The distance between the rightmost end of the first guide rail and the leftmost end of the second guide rail is just enough to satisfy the distance between the first monitoring ring 201 and the second monitoring ring 202 without gap contact.

[0034] Furthermore, the third sleeve rod 102c is used to drive the first monitoring ring 201 connected to it to move on the first sleeve rod 102a, thereby changing the ground clearance of the first monitoring ring 201. The fourth sleeve rod 102d is used to drive the second monitoring ring 202 connected to it to move on the second sleeve rod 102b, thereby changing the ground clearance of the second monitoring ring 202. The locking member 300 enters a through hole on the third sleeve rod 102c. By tightening or loosening the locking member 300, the contact pressure between the locking member 300 and the first sleeve rod 102a can be adjusted, thereby realizing the locking or sliding between the third sleeve rod 102c and the first sleeve rod 102a.

[0035] In this embodiment, the locking member 300 includes a plug rod 301 slidably connected to the third sleeve rod 102c, a plurality of plug holes 302 equidistantly opened on the first sleeve rod 102a, and a locking key 303 disposed at the end of the plug rod 301. A groove is provided on the plug rod 301, and an elastic member 304 is disposed between the locking key 303 and the groove. In this embodiment, the elastic member 304 is a spring.

[0036] Furthermore, the outer shell of the first monitoring ring 201 passes through the through hole provided on the third sleeve rod 102c. By operating the first handle 203 connected to the first monitoring ring 201, the first monitoring ring 201 can be rotated on the third sleeve rod 102c, thereby adjusting its position. A connecting rod 406 is also connected between the second monitoring ring 202 and the handle 203. Through holes for the connecting rod 406 to pass through are opened on the third sleeve rod 102c and the fourth sleeve rod 102d. Threaded rods 407 are threadedly connected to the third sleeve rod 102c and the fourth sleeve rod 102d.

[0037] Preferably, one end of the first conductor 401 of the first monitoring ring 201 is convex, allowing it to be tightly connected to the concave end of the conductor of the second monitoring ring 202. The other end of the first monitoring ring 201 is concave, allowing it to be tightly connected to the convex end of the conductor of the second monitoring ring 202. During operation, firstly, by adjusting the locking member 300 and the second locking device, the third sleeve rod 102c and the fourth sleeve rod 102d are moved, causing the first monitoring ring 201 and the second monitoring ring 202 to move to the height of the cable. Secondly, by adjusting the third and fourth locking devices, the first monitoring ring 201 and the second monitoring ring 202 are rotated to the plane of the cable cross-section. Next, the first handle 203 and the second handle 203 are pulled, allowing the cable to enter the gap between the first monitoring ring 201 and the second monitoring ring 202. Finally, the first handle 203 and the second handle 203 are pulled, bringing the first monitoring ring 201 and the second monitoring ring 202 into tight contact. At this point, the cable is positioned between the first monitoring ring 201 and the second monitoring ring 202, and the measurement work can begin.

[0038] In this embodiment, the control component 500 includes a drive module 501, a communication module 502, a remote control module 503, a power grid operation data monitoring module 504, and an information acquisition and storage module 505. The communication module 502 is connected to the remote control module 503, the remote control module 503 is connected to the drive module 501, and the drive module 501 is connected to the power grid operation data monitoring module 504 and the information acquisition and storage module 505. In this invention, to enable remote control, the control device internally includes a remote control module 503, a communication module 502, and a drive module 501 to facilitate remote data transmission and control. To enable data storage, the control device internally includes an information acquisition and storage module 505 to collect and store power system frequency monitoring data in real time.

[0039] In this embodiment, a voltage acquisition unit 601, a voltage measuring unit 602, a voltage phase angle measuring instrument 603, a turns ratio coil 604, and a turns ratio adjusting contact 605 are provided inside the transformer module 600. The voltage acquisition unit 601 is connected to the first monitoring loop 201, the voltage measuring unit 602 is connected to the frequency measurement and calculation module, the voltage phase angle measuring instrument 603 is connected to the voltage acquisition unit 601, the turns ratio coil 604 is connected to both the voltage acquisition unit 601 and the voltage measuring unit 602, and the turns ratio adjusting contact 605 is connected to the turns ratio coil 604. To enable widespread application in low-voltage cables, the transformer module 600 of this invention is equipped with an adjustable turns ratio coil and adjusting contact, allowing frequency measurement in low-voltage cables ranging from 220V to 35kV.

[0040] Operation process: The structure is simple and easy to use. It has remote control and communication devices, which can be used for remote intelligent control and measurement at the terminal. It can effectively monitor the frequency change of the power system in real time, and can record, store and analyze test data simultaneously inside the frequency measuring instrument and at the remote terminal. At the same time, it effectively improves the portability, mobility and safety of the equipment.

[0041] Example 2

[0042] Reference Figure 5 and Figure 6 This embodiment differs from the first embodiment in that: the present invention also includes a sliding component 700. In this embodiment, the sliding component 700 includes an upper support mounted on the base 101 and an adjusting ring 702 rotatably connected to the base plate. The rotation plane of the adjusting ring 702 is vertically arranged. Threaded holes 703 are provided at both ends of the adjusting ring 702. Pull rods are threadedly connected to both threaded holes 703. Short rod heads are provided at the ends of the pull rods. Short rod grooves that cooperate with the short rod heads are provided on the first bent arm and the second bent arm. One of the pull rods is connected to the first sleeve rod 102a, and the other pull rod is connected to the second sleeve rod 102b.

[0043] Furthermore, a rotating component 706 is provided on the adjusting ring 702. In this embodiment, the rotating component 706 includes a first gear 706a coaxially arranged on the adjusting ring 702, and a second gear 706b rotatably connected to the upper support. The second gear 706b is always meshed with the first gear 706a. A middle bearing rod extends from the rotating shaft of the second gear 706b, and a locking wheel 706d is coaxially arranged at the rear end of the middle bearing rod. A plurality of teeth 706e are provided on the outer peripheral wall of the locking wheel 706d. A locking block 707 is sleeved on the middle bearing rod and fixed to the upper support. A hole is opened in the middle for the middle bearing rod to extend into. A sleeve 804 is slidably connected to the middle bearing rod and is connected to the locking wheel 706d. Thus, the locking wheel 706d can move on the middle bearing rod. A sliding mechanism is provided between the sleeve 804 and the locking block 707. In this embodiment, the elastic element 708 is a spring, which constantly pulls the sleeve 804 to slide closer to the locking block 707. A locking disc is rotatably connected inside the locking block. A circular groove 801 that mates with the locking wheel 706d is provided on the locking disc. Several slots for the locking teeth 706e that mate with the locking teeth 706e are provided on the side wall of the circular groove 801. A stepper motor 803 is provided at the rear end of the locking disc. The stepper motor 803 constantly drives the rotation of the locking disc. When the locking wheel 706d is engaged in the locking disc, the locking disc will always drive the locking wheel 706d to rotate. At this time, the rotation of the central bearing rod drives the second gear 706b, which drives the first gear 706a to rotate, thereby driving the adjustment ring 702 to rotate.

[0044] Furthermore, a locking component is provided on the upper support. The locking component includes a clamping ring hinged to the sleeve 804, a swing rod 902 located at the rear end of the clamping ring, and a tension sensor located on the upper support. The front end of the tension sensor is electrically connected to an electric cylinder 903. The electric cylinder 903 is hinged to the rear end of the swing rod 902. A gear is provided at the end of the short rod head, and a rack that meshes with the gear is provided in the groove of the short rod. The rack is arc-shaped.

[0045] The rest of the structure is the same as in Example 1.

[0046] Operation process: When the locking wheel 706d is engaged in the locking disc, the locking disc will always drive the locking wheel 706d to rotate. At this time, the rotation of the central bearing rod drives the second gear 706b, the second gear 706b drives the first gear 706a to rotate, which in turn drives the adjustment ring 702 to rotate, which in turn drives the short rod head to rotate, thereby driving the gear at the front end of the short rod head to rotate. When the gear rotates, it synchronously drives the rack to slide. Since the rack is arc-shaped, it will drive the first bent arm or the second bent arm to rotate, thereby changing the relative position of the first monitoring ring 201 and the second monitoring ring 202.

[0047] It is important to note that the constructions and arrangements of this application shown in several different exemplary embodiments are merely illustrative. Although only a few embodiments are described in detail in this disclosure, those who consult this disclosure will readily understand that many modifications are possible (e.g., changes in the size, dimensions, structure, shape, and proportions of various elements, as well as parameter values ​​(e.g., temperature, pressure, etc.), mounting arrangements, use of materials, color, orientation, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in this application). For example, an element shown as integrally formed may be composed of multiple parts or elements, the position of elements may be inverted or otherwise altered, and the nature or number or position of discrete elements may be changed or altered. Therefore, all such modifications are intended to be included within the scope of the invention. The order or sequence of any process or method steps may be changed or rearranged according to alternative embodiments. In the claims, any "device plus function" clause is intended to cover the structure described herein that performs the function, and not only structurally equivalent but also equivalent in structure. Other substitutions, modifications, alterations, and omissions may be made in the design, operation, and arrangement of the exemplary embodiments without departing from the scope of the invention. Therefore, the present invention is not limited to the specific embodiments, but extends to various modifications that still fall within the scope of the appended claims.

[0048] Furthermore, in order to provide a concise description of exemplary embodiments, not all features of actual embodiments (i.e., those features that are not relevant to the currently considered best mode for carrying out the invention, or those features that are not relevant to implementing the invention) may be omitted.

[0049] It should be understood that numerous specific implementation decisions can be made during the development of any practical implementation, such as in any engineering or design project. Such development efforts may be complex and time-consuming, but for those skilled in the art who benefit from this disclosure, the development effort will be a routine work of design, manufacturing, and production without requiring much experimentation.

[0050] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A movable frequency change sensor for monitoring low-voltage cables, characterized in that: include, The bracket assembly (100) includes a base (101), a support member (102) disposed on the base (101), and a braking member (103) disposed on the base (101). The locking assembly (200) includes a first monitoring ring (201) disposed on the support member (102), a second monitoring ring (202) disposed on the support member (102), and handles (203) respectively disposed on the first monitoring ring (201) and the second monitoring ring (202); and, A control component (500) is disposed on a base (101); The base (101) is provided with a first guide rail groove (204) and a second guide rail groove (205). The support member (102) includes a first sleeve rod (102a) and a second sleeve rod (102b) that are slidably connected in the first guide rail groove (204) and the second guide rail groove (205), respectively. A third sleeve rod (102c) is slidably connected to the upper end of the first sleeve rod (102a). A fourth sleeve rod (102d) is slidably connected to the second sleeve rod (102b). Locking members (300) are provided on the third sleeve rod (102c) and the fourth sleeve rod (102d). The locking component (300) includes a plug (301) slidably connected to the third sleeve (102c), a plurality of plug holes (302) equidistantly opened on the first sleeve (102a), and a locking key (303) provided at the end of the plug (301). The insertion rod (301) has a groove, and an elastic element (304) is provided between the locking key (303) and the groove. The base (101) is used to fix the first guide rail groove (204) and the second guide rail groove (205). The roller is fixed below the base (101) to move the base (101). The brake pad is used to lock the roller to limit its rotation. The first sleeve rod (102a) is used to drive the third sleeve rod (102c) and the first monitoring ring (201) connected to it to move left and right on the first guide rail groove (204) in a direction parallel to the base (101). The second sleeve rod (102b) is used to drive the fourth sleeve rod (102d) and the second monitoring ring (202) connected to it to move left and right on the second guide rail groove (205) in a direction parallel to the base (101). The distance between the rightmost end of the first guide rail and the leftmost end of the second guide rail is just enough to satisfy the distance between the first monitoring ring (201) and the second monitoring ring (202) without gap contact. The third sleeve rod (102c) is used to drive the first monitoring ring (201) connected to it to move on the first sleeve rod (102a), thereby changing the ground height of the first monitoring ring (201). The fourth sleeve rod (102d) is used to drive the second monitoring ring (202) connected to it to move on the second sleeve rod (102b), thereby changing the ground height of the second monitoring ring (202). The locking member (300) enters a through hole on the third sleeve rod (102c). By tightening or loosening the locking member (300), the contact pressure between the locking member (300) and the first sleeve rod (102a) can be adjusted, thereby realizing the locking or sliding between the third sleeve rod (102c) and the first sleeve rod (102a).

2. The movable frequency change sensor monitoring instrument for low-voltage cables as described in claim 1, characterized in that: The first monitoring ring (201) includes a first monitoring housing (400) connected to the handle (203), a first conductor (401) disposed in the first monitoring housing (400), and a ring resistor (402) disposed in the first monitoring housing (400). There are two first conductors (401), which are respectively disposed on both sides of the ring resistor (402). The two ends of the first conductor (401) are connected to wires (403).

3. The movable frequency change sensor monitoring instrument for low-voltage cables as described in claim 2, characterized in that: The second monitoring ring (202) includes a second monitoring housing (404) and a second conductor (405) disposed inside the second monitoring housing (404). One end of the first conductor (401) is convex, and one end of the second conductor (405) is concave. The second conductor (405) is convex at one end and concave at the other end.

4. The movable frequency change sensor monitoring instrument for low-voltage cables as described in claim 1, characterized in that: A connecting rod (406) is connected between the first monitoring ring (201) and the handle (203), and a connecting rod (406) is also connected between the second monitoring ring (202) and the handle (203). The third sleeve rod (102c) and the fourth sleeve rod (102d) are provided with through holes for the connecting rod (406) to pass through. Threaded rods (407) are threadedly connected to the third sleeve rod (102c) and the fourth sleeve rod (102d).

5. The movable frequency change sensor monitoring instrument for low-voltage cables as described in claim 1, characterized in that: The control component (500) includes a drive module (501), a communication module (502), a remote control module (503), a power grid operation data monitoring module (504), and an information acquisition and storage module (505). The communication module (502) is connected to the remote control module (503), the remote control module (503) is connected to the drive module (501), and the drive module (501) is connected to the power grid operation data monitoring module (504) and the information acquisition and storage module (505).

6. The movable frequency change sensor monitoring instrument for low-voltage cables as described in claim 1 or 5, characterized in that: A transformer module (600) is provided on the base (101). The transformer module (600) includes a voltage acquisition unit (601), a voltage measuring unit (602), a voltage phase angle measuring instrument (603), a turns ratio coil (604), and a turns ratio adjusting contact (605). The voltage acquisition unit (601) is connected to the first monitoring ring (201) through a wire (403). The voltage measuring unit (602) is connected to the frequency measurement and calculation module. The voltage phase angle measuring instrument (603) is connected to the voltage acquisition unit (601). The turns ratio coil (604) is connected to the voltage acquisition unit (601) and the voltage measuring unit (602). The turns ratio adjusting contact (605) is connected to the turns ratio coil (604).

7. The movable frequency change sensor monitoring instrument for low-voltage cables as described in claim 4, characterized in that: A sliding component (700) is provided on the base (101).

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