Passive circulation monitor

Abstract

The utility model relates to the technical field of electric power, in particular to a passive circulation monitor, which comprises a main body structure and a grasping assembly, the main body structure is formed by connecting an upper shell and a lower shell and comprises an electricity taking part, a mutual inductance part and a circuit board, and the electricity taking part comprises a first annular mutual inductance coil and a second annular mutual inductance coil which are arranged in the lower shell of the main body structure; the closed iron ring penetrates through the axis of the first annular mutual inductance coil and the axis of the second annular mutual inductance coil and extends out of the lower shell; the mutual inductance part comprises a flexible Rogowski coil which is partially arranged on one side, far away from the power taking part, in the lower shell, and the part, located in the lower shell, of the flexible Rogowski coil is connected with a clamping assembly used for being fixedly connected with the lower shell; the circuit board comprises a power supply module, a signal processing module and a wireless transmission module. The problem of difficult electricity taking of the circulating current monitoring device is solved by arranging the electricity taking part, the cable circulating current is monitored in real time by arranging the mutual inductance part, and the cable operation state is judged through the circuit board.

Description

Technical Field

[0001] The utility model relates to the technical field of electric power, in particular to a passive circulating current monitor. Background Art

[0002] With the continuous development of urban construction, urban power supply facilities have also developed rapidly. As a carrier of power transmission, cables have gradually formed a large-scale power supply network under the city. Due to the large number of cables distributed, how to improve the operation efficiency of cables and ensure the safe operation of cables has become an important problem currently faced.

[0003] In the prior art, in order to predict cable faults in advance, a circulating current monitoring device is installed on a high-voltage cable grounding box to monitor the magnitude of the circulating current in the cable. However, due to the complex environment of the high-voltage cable grounding box and very high construction safety requirements, there is a problem of difficult power supply acquisition for the circulating current monitoring device. Even if some circulating current monitoring products adopt a low-power design and use their own built-in batteries for power supply, the circulating current monitoring device will also stop working due to the depletion of the electric energy of the built-in battery.

[0004] In view of the above technical problems, there is an urgent need for a circulating current monitoring device that can solve the problem of difficult power supply acquisition for the circulating current monitoring device. Summary of the Utility Model

[0005] Therefore, the utility model provides a passive circulating current monitor to overcome the problem of difficult power supply acquisition for the circulating current monitoring device in the prior art.

[0006] To achieve the above object, on the one hand, the utility model provides a passive circulating current monitor, including: a main body structure connected by an upper housing and a lower housing, the main body structure includes a power acquisition part for acquiring power from a cable to be measured, a mutual inductance part for monitoring the circulating current of the cable to be measured, and a circuit board for converting the induced current, wherein,

[0007] The power acquisition part includes a first ring-shaped mutual inductance coil and a second ring-shaped mutual inductance coil arranged in the lower housing of the main body structure, and a closed iron ring passing through the coil axis of the first ring-shaped mutual inductance coil and the coil axis of the second ring-shaped mutual inductance coil and extending to the outside of the lower housing;

[0008] The mutual inductance part includes a flexible Rogowski coil partially arranged on one side of the lower housing away from the power acquisition part, and a clamping component for fixedly connecting with the lower housing is connected to the part of the flexible Rogowski coil located in the lower housing;

[0009] The closed iron ring and the flexible Rogowski coil both surround the cable under test in the working state. The circuit board includes a signal processing module connected to the flexible Rogowski coil for monitoring the circulating current state of the cable under test, a wireless transmission module connected to the signal processing module, and a power supply module respectively connected to the first annular mutual inductance coil and the second annular mutual inductance coil for inducing the cable under test to supply power to the signal processing module and the wireless transmission module.

[0010] Further, a first through hole is provided on one side of the front surface of the lower housing, and a second through hole opposite to the first through hole is provided on one side of the rear surface of the lower housing. The closed iron ring passes through the first through hole and the second through hole to penetrate the axes of the first annular mutual inductance coil and the second annular mutual inductance coil;

[0011] A third through hole is provided on the side of the front surface of the lower housing away from the first through hole, and a fourth through hole opposite to the third through hole is provided on the side of the rear surface of the lower housing. The flexible Rogowski coil penetrates through the third through hole and the fourth through hole.

[0012] Further, a first card slot is provided on one side of the lower housing near the first through hole and the second through hole, and the first annular mutual inductance coil and the second annular mutual inductance coil are fixedly connected inside the first card slot.

[0013] Further, the part of the closed iron ring connected to the lower housing is a planar sheet structure, and the part of the closed iron ring located outside the lower housing is a U-shaped planar sheet structure;

[0014] The closed iron ring is provided with a closable opening, and the opening is located at the connection position of the planar sheet structure and the U-shaped planar sheet structure, so that the closed iron ring forms a closed loop to surround the cable under test in the working state, and forms an opening for the cable under test to enter and exit the outside of the closed iron ring in the open state.

[0015] Further, a second card slot is provided on one side of the lower housing near the third through hole and the fourth through hole to fix the card connection component.

[0016] Further, the card connection component includes a card connection part and a knob part. The card connection part is fixedly connected inside the second card slot, and the knob part passes through the third through hole and is connected to the card connection part;

[0017] Wherein, a coil socket is provided on the knob part.

[0018] Further, one end of the flexible Rogowski coil passes through the fourth through hole and is connected to the clamping assembly, and the other end is provided with a coil plug. The coil plug is connected to the coil socket on the knob part to form a closed coil. The knob part fixes the position of the coil plug to fixedly connect the flexible Rogowski coil to the lower housing.

[0019] Further, a circuit board is installed between the first card slot and the second card slot inside the lower housing. Among them, the inner wall of the lower housing near the front side is provided with a first bearing surface, and the inner wall of the lower housing near the rear side is provided with a second bearing surface opposite to the first bearing surface. The circuit board is installed on the first bearing surface and the second bearing surface.

[0020] Further, a grasping assembly fixedly connected to the main body structure is further provided on the outer bottom surface of the lower housing for clamping the cable under test;

[0021] The grasping assembly includes a chute main body for fixedly connecting to the main body structure, a clamping part for clamping the cable under test, a limiting part for restricting the moving range of the clamping part, and a spring combination for providing elasticity for the clamping part to move along the sliding direction of the chute main body.

[0022] Further, the clamping part includes a first clamping end and a second clamping end symmetrically arranged on the chute main body. The inner sides of the first clamping end and the second clamping end facing each other are used to clamp the cable under test, and the outer sides of the first clamping end and the second clamping end facing each other are respectively connected to the spring combination.

[0023] Compared with the prior art, the beneficial effects of the present utility model are as follows. The present invention designs a passive circulating current monitor, including a main body structure and a grasping assembly. The main body structure is provided with a power-taking part, a mutual inductance part, and a circuit board. The power-taking part is designed with a first annular mutual inductance coil, a second annular mutual inductance coil, and a closed iron ring, which can directly take power from the grounding wire of the high-voltage cable, solving the problem of difficult power-taking for the circulating current monitoring device. At the same time, the flexible Rogowski coil in the mutual inductance part monitors the change of the cable circulating current, providing data support for the subsequent cable condition diagnosis. The flexible Rogowski coil is fixed in the lower housing of the main body structure through the clamping assembly to ensure the stability and reliability of the flexible Rogowski coil monitoring. The real-time state of the cable is sent to the remote control center through the circuit board so as to take corresponding measures in time, significantly improving the safety of cable operation and maintenance in many aspects.

[0024] Further, the present invention provides a first card slot to fix the first annular mutual inductance coil and the second annular mutual inductance coil inside the main body structure, preventing the first annular mutual inductance coil and the second annular mutual inductance coil from moving or loosening, effectively fixing and clamping the first annular mutual inductance coil and the second mutual inductance coil, thereby further realizing power extraction directly from the grounding wire of the high-voltage cable through the annular mutual inductance coil and ensuring the stability and reliability of power extraction for the circulating current monitor.

[0025] Further, the present invention provides a clamping component, which includes a clamping part and a knob part. The clamping part is fixedly connected inside the second card slot, and the knob part is connected to the clamping part through the third through hole. The stability of the flexible Rogowski coil is controlled by the clamping part and the knob part to prevent the flexible Rogowski coil from loosening. At the same time, the flexible Rogowski coil is an openable and closable structure, which is convenient for disassembly and installation, thereby further providing data support for subsequent cable condition diagnosis and facilitating later maintenance, significantly improving the safety of cable operation and maintenance.

[0026] Further, the present invention provides a grasping component fixedly connected to the main body structure. The main body structure is fixed by effectively clamping the measured cable through the grasping component, thereby further realizing power extraction directly from the grounding wire of the high-voltage cable through the annular mutual inductance coil in the main body structure and ensuring the stability and reliability of power extraction for the circulating current monitor. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is the overall structure diagram of the passive circulating current monitor of the present utility model;

[0028] Figure 2 is the disassembled structure diagram of the main body structure of the passive circulating current monitor of the present utility model;

[0029] Figure 3 is the structure diagram of the power extraction part and the mutual inductance part of the passive circulating current monitor of the present utility model;

[0030] Figure 4 is the structure diagram of the lower shell of the main body structure of the passive circulating current monitor of the present utility model;

[0031] Figure 5 is the disassembled structure diagram of the grasping component of the passive circulating current monitor of the present utility model;

[0032] Figure 6 is the combined structure diagram of the grasping component of the passive circulating current monitor of the present utility model;

[0033] 1, cable under test; 2, upper housing; 3, lower housing; 41, first annular mutual inductance coil; 42, second annular mutual inductance coil; 5, closed iron ring; 6, flexible Rogowski coil; 61, clamping part; 62, knob part; 621, coil socket; 63, coil plug; 7, circuit board; 81, first through hole; 82, second through hole; 83, third through hole; 84, fourth through hole; 91, first card slot; 92, second card slot; 101, first bearing surface; 102, second bearing surface; 111, first chute; 112, second chute; 113, third chute; 114, fourth chute; 121, first limit card slot; 1211, first concave seat; 1212, second concave seat; 122, second limit card slot; 1221, third concave seat; 1222, fourth concave seat; 131, first clamping end; 1311, first sliding part; 1312, second sliding part; 141, second clamping end; 1411, third sliding part; 1412, fourth sliding part; 151, first spring; 152, second spring; 153, third spring; 154, fourth spring. Detailed implementation manners

[0034] In order to make the purpose and advantages of the present utility model clearer and more understandable, the present utility model will be further described below in conjunction with embodiments; it should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0035] The preferred implementation manners of the present utility model will be described below with reference to the accompanying drawings. Those skilled in the art should understand that these implementation manners are only used to explain the technical principle of the present utility model and do not limit the protection scope of the present utility model.

[0036] It should be noted that in the description of the present utility model, the terms indicating directions or positional relationships such as "upper", "lower", "left", "right", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings. This is only for convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present utility model.

[0037] In addition, it should also be noted that in the description of the present utility model, unless otherwise clearly specified and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those skilled in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0038] Please refer toFigures 1 to 4 As shown Figure 1 This is the overall structure diagram of the passive circulating current monitor of the present utility model, Figure 2 This is the disassembled structure diagram of the main body structure of the passive circulating current monitor of the present utility model, Figure 3 This is the structure diagram of the power taking part and the mutual inductance part of the passive circulating current monitor of the present utility model, Figure 4 This is the structure diagram of the lower shell of the main body structure of the passive circulating current monitor of the present utility model.

[0039] The present utility model provides a passive circulating current monitor, including: a main body structure connected by an upper shell 2 and a lower shell 3, the main body structure including a power taking part for taking power from a measured cable 1, a mutual inductance part for monitoring the circulating current of the measured cable 1, and a circuit board 7 for converting the induced current, wherein,

[0040] The power taking part includes a first annular mutual inductance coil 41 and a second annular mutual inductance coil 42 arranged in the lower shell 3 of the main body structure, and a closed iron ring 5 passing through the coil axes of the first annular mutual inductance coil 41 and the second annular mutual inductance coil 42 and extending outside the lower shell 3;

[0041] The mutual inductance part includes a flexible Rogowski coil 6 partially arranged on one side of the lower shell 3 far from the power taking part, and a clamping component for fixedly connecting with the lower shell 3 is connected to the part of the flexible Rogowski coil 6 located in the lower shell 3;

[0042] The closed iron ring 5 and the flexible Rogowski coil 6 both surround the measured cable 1 in the working state. The circuit board 7 includes a signal processing module connected to the flexible Rogowski coil 6 for monitoring the circulating current state of the measured cable 1, a wireless transmission module connected to the signal processing module, and a power supply module respectively connected to the first annular mutual inductance coil 41 and the second annular mutual inductance coil 42 for inducing power supply for the signal processing module and the wireless transmission module by the measured cable 1.

[0043] It can be understood that the power supply module includes an energy taking power supply module and an energy storage module. The energy taking power supply module converts the induced voltage generated by the first annular mutual inductance coil 41 and the second annular mutual inductance coil 42 into a DC voltage output after transformation processing such as rectification, filtering, and voltage stabilization and stores it in the energy storage module for use by the passive circulating current monitor. The signal processing module is used to receive and process the output signal of the flexible Rogowski coil 6 and is used for monitoring the running state of the cable. The wireless transmission module transmits the monitoring data to a remote monitoring center or other devices in real time through a wireless communication method, effectively monitors the running state of the measured cable 1, and provides a guarantee for the stable operation of the power grid. In the working state, the outer side of the upper shell 2 faces downwards.

[0044] In implementation, the circuit board 7 may further include the control module. The control chip is used by the control module to judge the output signal of the flexible Rogowski coil 6 after being processed by the signal processing module, so as to judge the operating state of the measured cable 1, and the judgment result is transmitted through the wireless transmission module.

[0045] In implementation, the energy-taking power supply module may include a filtering circuit (removing noise and interference components in the signal) and a rectifying circuit (converting an AC signal into a DC signal). As long as the circuits included in the energy-taking power supply module can convert the signals received by the first annular mutual inductor coil 41 and the second annular mutual inductor coil 42 into voltages that can be stably used by the passive annular monitor, specific limitations are not made here.

[0046] In implementation, the energy storage module of the circuit board 7 uses a super capacitor to store the electric energy output by the energy-taking power supply module on the circuit board 7. The electronic components corresponding to the energy storage module on the circuit board 7 can be adjusted and selected according to actual conditions, which will not be elaborated here.

[0047] In implementation, the signal processing module may include a signal amplification circuit (amplifying the flexible Rogowski coil signal), a filtering circuit (removing noise and interference components in the signal), and an integration circuit (restoring the voltage signal output by the flexible Rogowski coil). The circuits involved in the signal processing module are not specifically limited. As long as the output signal of the flexible Rogowski coil 6 can be received and processed for the state monitoring of the measured cable 1, it will not be elaborated here.

[0048] The present invention designs a passive circulating current monitor, including a main body structure and a gripping component. The main body structure is provided with a power-taking part, a mutual inductance part, and a circuit board 7. The power-taking part is designed with a first annular mutual inductor coil 41, a second annular mutual inductor coil 42, and a closed iron ring 5, which can directly take power from the ground wire of the high-voltage cable (measured cable 1), solving the problem of difficult power-taking for the circulating current monitoring device. At the same time, the flexible Rogowski coil 6 in the mutual inductance part monitors the change of the cable circulating current, providing data support for subsequent cable state diagnosis. The flexible Rogowski coil 6 is fixed in the lower housing 3 of the main body structure through the clamping component to ensure the monitoring stability and reliability of the flexible Rogowski coil 6. The real-time state of the cable is sent to the remote control center through the circuit board 7 so as to take corresponding measures in time, significantly improving the safety of cable operation and maintenance in many aspects.

[0049] Specifically, a first through hole 81 is provided on one side of the front side surface of the lower housing 3, and a second through hole 82 opposite to the first through hole 81 is provided on one side of the rear side surface of the lower housing 3. The closed iron ring 5 penetrates through the axis of the first annular mutual inductor coil 41 and the second annular mutual inductor coil 42 through the first through hole 81 and the second through hole 82;

[0050] On the front side of the lower housing 3, a third through hole 83 is provided on a side away from the first through hole 81, and on the rear side of the lower housing 3, a fourth through hole 84 opposite to the third through hole 83 is provided on a side away from the second through hole 82. The flexible Rogowski coil 6 passes through the third through hole 83 and the fourth through hole 84.

[0051] In implementation, the sizes and shapes of the first through hole 81 and the second through hole 82 are not specifically limited as long as the closed iron ring 5 can pass through them. The sizes and shapes of the fourth through hole 84 are not specifically limited as long as the flexible Rogowski coil 6 can pass through the fourth through hole 84. Details are not elaborated here.

[0052] Specifically, a first clamping groove 91 is provided inside the lower housing 3 on a side close to the first through hole 81 and the second through hole 82. The first annular mutual inductance coil 41 and the second annular mutual inductance coil 42 are fixedly connected inside the first clamping groove 91.

[0053] In implementation, the shape and size of the first clamping groove 91 are not specifically limited as long as it can accommodate the first annular mutual inductance coil 41 and the second annular mutual inductance coil 42. Details are not elaborated here.

[0054] The present invention provides the first clamping groove 91 to fix the first annular mutual inductance coil 41 and the second annular mutual inductance coil 42 inside the main body structure, avoiding the movement or loosening of the first annular mutual inductance coil 41 and the second annular mutual inductance coil 42, effectively fixing and clamping the first annular mutual inductance coil 41 and the second mutual inductance coil, thereby further realizing power extraction directly from the grounding wire of the high-voltage cable through the annular mutual inductance coil and ensuring the stability and reliability of power extraction of the circulating current monitor.

[0055] Specifically, the part of the closed iron ring 5 connected to the lower housing 3 is a planar sheet structure, and the part of the closed iron ring 5 located outside the lower housing 3 is a U-shaped planar sheet structure;

[0056] The closed iron ring 5 is provided with a closable opening, and the opening is located at the connection position between the planar sheet structure and the U-shaped planar sheet structure, so that the closed iron ring 5 forms a closed loop surrounding the measured cable 1 in the working state and forms an opening for the measured cable 1 to enter and exit the outside of the closed iron ring 5 in the open state.

[0057] In implementation, the U-shaped planar sheet-like structure can be a U-shaped, V-shaped, arc-shaped, semi-circular or other planar sheet-like structure, which can be selected according to the actual situation, as long as it can enable the closed iron ring 5 to form a closed loop around the cable under test 1 in the working state and form an opening for the cable under test 1 to enter and exit outside the closed iron ring 5 in the open state. Details are not elaborated here.

[0058] Specifically, a second card slot 92 is provided inside the lower housing 3 on one side close to the third through hole 83 and the fourth through hole 84 to fix the card connection component. The card connection component includes a card connection part 61 and a knob part 62. The card connection part 61 is fixedly connected inside the second card slot 92, and the knob part 62 passes through the third through hole 83 and is connected to the card connection part 61; wherein, a coil socket 621 is provided on the knob part 62.

[0059] In implementation, the shape and size of the second card slot 92 are not specifically limited, as long as the second card slot 92 can accommodate the card connection part 61. Details are not elaborated here.

[0060] In implementation, the shape and size of the third through hole 83 and the fourth through hole 84 are not specifically limited, as long as the knob part 62 can pass through the third through hole 83 and be connected to the card connection part 61. Details are not elaborated here.

[0061] The present invention is provided with a card connection component, which includes a card connection part 61 and a knob part 62. The card connection part 61 is fixedly connected inside the second card slot 92, and the knob part 62 is connected to the card connection part 61 through the third through hole 83. The stability of the flexible Rogowski coil 6 is controlled by the two parts of the card connection part 61 and the knob part 62 to prevent the flexible Rogowski coil 6 from loosening. At the same time, the flexible Rogowski coil 6 is an openable and closable structure, which is convenient for disassembling and installing with the cable under test 1, thereby further providing data support for the subsequent diagnosis of the cable operation state and facilitating later maintenance, significantly improving the safety of cable operation and maintenance.

[0062] Specifically, one end of the flexible Rogowski coil 6 passes through the fourth through hole 84 and is connected to the card connection component, and the other end is provided with a coil plug 63. The coil plug 63 is connected to the coil socket 621 on the knob part 62 to form a closed coil. The knob part 62 fixes the position of the coil plug 63 to make the flexible Rogowski coil 6 form a fixed connection with the lower housing 3.

[0063] It can be understood that before the main structure is to be installed on the cable 1 to be measured, the coil socket 621 and the coil plug 63 of the flexible Rogowski coil 6 are not connected, and the coil socket 621 and the coil plug 63 are in a connected state after the main structure is fixed on the cable 1 to be measured.

[0064] Specifically, the circuit board 7 is installed between the first card slot 91 and the second card slot 92 inside the lower housing 3. Among them, an inner wall of the lower housing 3 near the front side is provided with a first bearing surface 101, and an inner wall of the lower housing 3 near the rear side is provided with a second bearing surface 102 opposite to the first bearing surface 101. The circuit board 7 is installed on the first bearing surface 101 and the second bearing surface 102.

[0065] In implementation, the sizes and shapes of the first bearing surface 101 and the second bearing surface 102 are not specifically limited, as long as the first bearing surface 101 and the second bearing surface 102 can hold the circuit board 7 and do not affect the fixation of the circuit board 7 to the inner side of the bottom of the lower housing 3, which will not be elaborated here.

[0066] In implementation, the connection method between the circuit board 7 and the bottom of the lower housing 3 is not specifically limited, as long as the circuit board 7 can be fixed to the bottom of the lower housing 3, for example, by using bolts for fixation, which will not be elaborated here.

[0067] Please refer to Figures 5 to 6 as shown in Figure 5 the disassembled structure diagram of the grasping component of the passive circulating current monitor of the present utility model, Figure 6 and the assembled structure diagram of the grasping component of the passive circulating current monitor of the present utility model.

[0068] Specifically, a grasping component fixedly connected to the main structure is further provided on the outer bottom surface of the lower housing for clamping the cable 1 to be measured; the grasping component includes a chute main body for fixedly connecting to the main structure, a clamping part for clamping the cable to be measured, a limiting part for limiting the moving range of the clamping part, and a spring assembly for providing elasticity for the clamping part to move along the sliding direction of the chute main body.

[0069] In implementation, the connection method between the grasping component and the main structure is not specifically limited, as long as the main structure can be fixed on the grasping component, which will not be elaborated here.

[0070] The present invention is provided with a gripping assembly fixedly connected to the main structure, through which the cable 1 under test is effectively clamped to fix the main structure, thereby further realizing direct power drawing from the high-voltage cable grounding wire through the annular mutual inductance coil in the main structure, and ensuring the stability and reliability of power drawing of the circulating current monitor.

[0071] Specifically, the clamping portion includes a first clamping end 131 and a second clamping end 141 symmetrically arranged on the slide groove body, the inner side surfaces opposite to each other of the first clamping end 131 and the second clamping end 141 are used to clamp the cable 1 under test, and the outer side surfaces opposite to each other of the first clamping end 131 and the second clamping end 141 are respectively connected to the spring combination.

[0072] It can be understood that the main structure can be fixed on the tested cable 1 through the first clamping end 131 and the second clamping end 141 .

[0073] Specifically, the slide groove body includes a first slide groove 111 and a second slide groove 112 symmetrically arranged on the right side of the slide groove body on the side of the slide groove body away from the main structure, and a third slide groove 113 and a fourth slide groove 114 symmetrically arranged on the left side of the slide groove body on the side of the slide groove body away from the main structure. The limiting portion includes a first limiting card groove 121 arranged on one side of the first slide groove 111 and the second slide groove 112 and fixedly connected to the slide groove body, and a second limiting card groove 122 arranged on one side of the third slide groove 113 and the fourth slide groove 114 and fixedly connected to the slide groove body; the spring combination includes a first spring 151 arranged inside the first slide groove 111, a second spring 152 arranged inside the second slide groove 112, a third spring 153 arranged inside the third slide groove 113, and a fourth spring 154 arranged inside the fourth slide groove 114.

[0074] Specifically, the outer surface of the first clamping end 131 and the outer surface of the second clamping end 141 are arc-shaped surfaces, and the inner surface of the first clamping end 131 and the inner surface of the second clamping end 141 are concave curved surfaces.

[0075] Specifically, the cross-sections of the first chute 111, the second chute 112, the third chute 113, and the fourth chute 114 are all narrower at the top and wider at the bottom. Below the first clamping end 131, there is a first sliding part 1311 slidably connected to the inside of the first chute 111, and below the first clamping end 131, there is a second sliding part 1312 slidably connected to the inside of the second chute 112. Below the second clamping end 141, there is a third sliding part 1411 slidably connected to the inside of the third chute 113, and below the second clamping end 141, there is a fourth sliding part 1412 slidably connected to the inside of the fourth chute 114.

[0076] In practice, the shapes and sizes of the cross-sections of the first chute 111, the second chute 112, the third chute 113, and the fourth chute 114 are not specifically limited, as long as when the grasping assembly is fixed on the cable under test 1, the first chute 111 can hold the first sliding part 1311, the second chute 112 can hold the second sliding part 1312, the third chute 113 can hold the third sliding part 1411, and the fourth chute 114 can hold the fourth sliding part 1412. Details are not elaborated here.

[0077] Specifically, above the inner side of the first limiting card slot 121, there are symmetrically arranged a first concave seat 1211 and a second concave seat 1212. Above the inner side of the second limiting card slot 122, there are symmetrically arranged a third concave seat 1221 and a fourth concave seat 1222.

[0078] Specifically, the first spring 151 is movably arranged inside the first chute 111, and one end of the first spring 151 abuts against the first concave seat 1211, and the other end abuts against the first sliding part 1311;

[0079] The second spring 152 is movably arranged inside the second chute 112, and one end of the second spring 152 abuts against the second concave seat 1212, and the other end abuts against the second sliding part 1312.

[0080] The third spring 153 is movably arranged inside the third chute 113, and one end of the third spring 153 abuts against the third concave seat 1221, and the other end abuts against the third sliding part 1411.

[0081] The fourth spring 154 is movably arranged inside the fourth chute 114, and one end of the fourth spring 154 abuts against the fourth concave seat 1222, and the other end abuts against the fourth sliding part 1412.

[0082] In implementation, the shapes and sizes of the first concave seat 1211, the second concave seat 1212, the third concave seat 1221, and the fourth concave seat 1222 are not specifically limited, as long as the first concave seat 1211 can accommodate one end of the first spring 151, the second concave seat 1212 can accommodate one end of the second spring 152, the third concave seat 1221 can accommodate one end of the third spring 153, and the fourth concave seat 1222 can accommodate one end of the fourth spring 154. Details are not elaborated here.

[0083] Specific working process:

[0084] Fixing process: When it is necessary to detect the cable under test 1, install and fix the passive circulating current monitor. When fixing the passive circulating current monitor to the cable under test 1, the first clamping end 131 and the second clamping end 141 of the grasping assembly respectively abut against the cable under test 1, driving the first sliding portion 1311 of the first clamping end 131 to move along the first chute 111 of the chute main body towards the first limit card slot 121, driving the second sliding portion 1312 of the first clamping end 131 to move along the second chute 112 of the chute main body towards the first limit card slot 121, driving the third sliding portion 1411 of the second clamping end 141 to move along the third chute 113 of the chute main body towards the first limit card slot 121, and driving the fourth sliding portion 1412 of the second clamping end 141 to move along the fourth chute 114 of the chute main body towards the first limit card slot 121. The first sliding portion 1311 drives the first spring 151 to move towards the first concave seat 1211, the second sliding portion 1312 drives the second spring 152 to move towards the second concave seat 1212, the third sliding portion 1411 drives the third spring 153 to move towards the third concave seat 1221, and the fourth sliding portion 1412 drives the fourth spring 154 to move towards the fourth concave seat 1222.

[0085] When the first spring 151, the second spring 152, the third spring 153, and the fourth spring 154 contract to a certain extent, the cable under test 1 enters between the first clamping end 131 and the second clamping end 141. At this time, the first spring 151 moves towards the first sliding part 1311, the second spring 152 moves towards the second sliding part 1312, the third spring 153 moves towards the third sliding part 1411, and the fourth spring 154 moves towards the fourth sliding part 1412. The first spring 151 drives the first sliding part 1311 to move along the first chute 111 away from the first spring 151, the second spring 152 drives the second sliding part 1312 to move along the second chute 112 away from the second spring 152, the third spring 153 drives the third sliding part 1411 to move along the third chute 113 away from the third spring 153, and the fourth spring 154 drives the fourth sliding part 1412 to move along the fourth chute 114 away from the fourth spring 154. Until the inner surfaces of the first clamping end 131 and the second clamping end 141 come into contact with the cable under test 1, the first spring 151, the second spring 152, the third spring 153, and the fourth spring 154 stop extending. At this time, the main body structure is fixed on the cable under test 1 through the grasping assembly. At this time, both the flexible Rogowski coil 6 and the closed iron ring 5 are in an open state, so that the cable under test 1 can be surrounded by the flexible Rogowski coil 6 and the closed iron ring 5. In the open state, the cable under test 1 enters through the opening of the closed iron ring 5, and after entering, the opening is closed to achieve the closed connection of the closed iron ring 5; in the open state, the coil socket 621 of the flexible Rogowski coil 6 is not connected to the coil plug 63 to allow the cable under test 1 to pass through. After the flexible Rogowski coil 6 surrounds the cable under test 1, the coil plug 63 is connected to the coil socket 621 on the knob part 62, and the coil plug 63 is fixed by rotating the knob part 62 to complete the work preparation of the passive circulating current monitor.

[0086] Power taking process: When the main body structure is fixed on the cable under test 1 through the grasping assembly, the cable under test 1 passes through the closed iron ring 5. When current flows through the cable under test 1, a changing magnetic field is generated around the cable under test 1. After the changing magnetic field passes through the closed iron ring 5, the first annular mutual inductance coil 41 and the second annular mutual inductance coil 42 sleeved on the closed iron ring 5 can sense the magnetic field change inside or around the closed iron ring 5 and generate an induced electromotive force. The induced electromotive force is output to the power supply module. The energy-taking power supply module in the power supply module converts the induced electromotive force into a DC voltage output after rectification, filtering, voltage stabilization and other conversion processes and stores it in the super capacitor of the energy storage module for use by the passive circulating current monitor.

[0087] Monitoring process: When the main structure is fixed on the cable 1 to be measured through the grasping component, the cable 1 to be measured passes through the flexible Rogowski coil 6. When the current in the cable 1 to be measured changes, a changing magnetic field is generated around the cable 1 to be measured. After the flexible Rogowski coil 6 senses the changing magnetic field, an induced electromotive force (differential signal of the current change rate) proportional to the current change rate is generated. Subsequently, the signal processing module restores the induced electromotive force of the flexible Rogowski coil 6 into a voltage signal proportional to the actual current in the cable 1 to be measured and transmits it to the control module. The control module further analyzes and judges the voltage signal output by the signal processing module, monitors the operating state of the cable 1 to be measured, and sends the monitoring result to the remote monitoring center or other devices in real time through the wireless transmission module, so as to take corresponding measures in time.

[0088] So far, the technical solution of the present invention has been described in conjunction with the preferred embodiments shown in the drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or replacements to the relevant technical features, and the technical solutions after these changes or replacements will fall within the protection scope of the present invention.

Claims

1. A passive circulating current monitor, characterized in that, It includes a main structure connected by an upper housing and a lower housing. The main structure includes a power-taking part for taking power from a cable under test, a mutual-inductance part for monitoring the circulating current of the cable under test, and a circuit board for converting the induced current. Among them, The power-taking part includes a first annular mutual-inductance coil and a second annular mutual-inductance coil arranged in the lower housing of the main structure, and a closed iron ring that penetrates the coil axis of the first annular mutual-inductance coil and the coil axis of the second annular mutual-inductance coil and extends to the outside of the lower housing; The mutual-inductance part includes a flexible Rogowski coil partially arranged on one side of the lower housing away from the power-taking part. The part of the flexible Rogowski coil located in the lower housing is connected with a clamping component for fixedly connecting with the lower housing; The closed iron ring and the flexible Rogowski coil both surround the cable under test in the working state. The circuit board includes a signal processing module connected to the flexible Rogowski coil for monitoring the circulating current state of the cable under test, a wireless transmission module connected to the signal processing module, and a power supply module respectively connected to the first annular mutual-inductance coil and the second annular mutual-inductance coil for inducing the cable under test to supply power to the signal processing module and the wireless transmission module.

2. The passive circulating current monitor according to claim 1, characterized in that, One side of the front side of the lower housing is provided with a first through hole, and one side of the rear side of the lower housing is provided with a second through hole opposite to the first through hole. The closed iron ring penetrates through the first through hole and the second through hole to communicate with the axes of the first annular mutual-inductance coil and the second annular mutual-inductance coil; One side of the front side of the lower housing away from the first through hole is provided with a third through hole, and one side of the rear side of the lower housing away from the second through hole is provided with a fourth through hole opposite to the third through hole. The flexible Rogowski coil penetrates through the third through hole and the fourth through hole.

3. The passive circulating current monitor according to claim 2, characterized in that, A first card slot is provided inside the lower housing near one side of the first through hole and the second through hole. The first annular mutual-inductance coil and the second annular mutual-inductance coil are fixedly connected inside the first card slot.

4. The passive circulating current monitor according to claim 3, wherein The part of the closed iron ring connected to the lower housing is a planar sheet structure, and the part of the closed iron ring located outside the lower housing is a U-shaped planar sheet structure; The closed iron ring is provided with a closable opening, and the opening is located at the connection position of the planar sheet structure and the U-shaped planar sheet structure, so that the closed iron ring forms a closed loop surrounding the cable under test in the working state, and forms an opening for the cable under test to enter and exit the outside of the closed iron ring in the open state.

5. The passive circulating current monitor according to claim 2, wherein A second card slot is provided inside the lower housing near one side of the third through hole and the fourth through hole to fix the clamping component.

6. The passive circulating current monitor according to claim 5, wherein The clamping component includes a clamping part and a knob part. The clamping part is fixedly clamped inside the second card slot, and the knob part passes through the third through hole and is connected to the clamping part; Among them, a coil socket is provided on the knob part.

7. The passive circulating current monitor according to claim 6, wherein One end of the flexible Rogowski coil passes through the fourth through-hole and is connected to the clamping assembly, and the other end is provided with a coil plug. The coil plug is connected to the coil socket on the knob portion to form a closed coil. The knob portion fixes the position of the coil plug to form a fixed connection between the flexible Rogowski coil and the lower housing.

8. The passive circulating current monitor according to claim 1, characterized in that, The circuit board is installed between the first card slot and the second card slot inside the lower housing. Among them, the inner wall of the lower housing near the front side is provided with a first bearing surface, and the inner wall of the lower housing near the rear side is provided with a second bearing surface opposite to the first bearing surface. The circuit board is installed on the first bearing surface and the second bearing surface.

9. The passive circulating current monitor according to claim 1, wherein, A grasping assembly fixedly connected to the main body structure is further provided on the outer bottom surface of the lower housing for clamping the cable under test; The grasping assembly includes a chute main body for fixedly connecting to the main body structure, a clamping portion for clamping the cable under test, a limiting portion for restricting the moving range of the clamping portion, and a spring assembly for providing elastic force for the clamping portion to move along the sliding direction of the chute main body.

10. The passive circulating current monitor according to claim 9, characterized in that, The clamping portion includes a first clamping end and a second clamping end symmetrically arranged on the chute main body. The inner sides of the first clamping end and the second clamping end facing each other are used for clamping the cable under test, and the outer sides of the first clamping end and the second clamping end facing each other are respectively connected to the spring assembly.

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