Novel intelligent cable terminal protector

Abstract

A novel intelligent cable terminal protector disclosed by the present invention comprises a packaging module, a circuit protection module and an intelligent monitoring module, the circuit protection module and the intelligent monitoring module are both arranged in the packaging module, and the packaging module comprises a core rod and an outer sheath. The core rod comprises a stud, a potting layer, a top cover, an outer frame, an antenna cap and a bottom cover; the intelligent monitoring module comprises a control circuit board, and a current detection circuit, a voltage detection circuit, an antenna circuit, a pulse counting circuit, a power supply circuit and a temperature detection circuit which are electrically connected with the control circuit board. According to the novel intelligent cable terminal protector disclosed by the invention, the realized functions comprise an original protection function, and parameters such as terminal voltage, action time, action times, total leakage current and the like can be monitored in real time.

Description

Technical Field

[0001] The invention belongs to the technical field of cable protection, and in particular relates to a novel intelligent cable terminal protector. Background Art

[0002] The cable protector is an important overvoltage protection device for power cables. It is connected between the metal outer sheath of the protected power cable and the ground to protect the metal outer sheath of the power cable from damage by overvoltage. During operation, the power cable must limit the induced voltage and fault overvoltage on the metal sheath of the power cable to prevent the overvoltage from breaking through the insulation of the cable outer sheath, causing multi-point grounding faults on the cable metal sheath, affecting the normal operation of the power cable and reducing the service life of the cable.

[0003] The current power cable protector can realize the protection function, but its operating parameters cannot be obtained, and the operating status of the protector cannot be monitored in real time. When the protector has an operating failure, it cannot be repaired quickly. The operation and maintenance party cannot know when and what kind of failure occurred, and cannot effectively protect the cable operation and carry out subsequent maintenance and improvement. Summary of the invention

[0004] The main purpose of the present invention is to provide a new type of intelligent cable terminal protector, which adopts an integrated design, does not add other devices, and does not expand the volume of the cable protector. The functions realized include not only the original protection functions, but also real-time monitoring of terminal voltage, action time, number of actions, total leakage current and other parameters. The monitoring data is transmitted to the background through a universal antenna data transmission method, thereby providing more reliable real-time information for status operation monitoring and achieving more effective protection for the grounding safety of the cable sheath.

[0005] To achieve the above objectives, the present invention provides a novel intelligent cable terminal protector, comprising a packaging module, a circuit protection module and an intelligent monitoring module, wherein the circuit protection module and the intelligent monitoring module are both built into the packaging module, wherein:

[0006] The packaging module comprises a core rod and an outer sheath, wherein the outer sheath (partially) surrounds and is installed on the core rod, and the core rod comprises a stud, a potting layer, a top cover, an outer frame, an antenna cap and a bottom cover, wherein the top cover is located above the outer frame, and the top cover and the outer frame are both provided with a first external thread, which is threadedly connected to the potting layer provided with a first internal thread; the inner wall of the outer frame is also provided with a second internal thread, which is threadedly connected to the bottom cover provided with a second external thread on the outer wall; the side wall of the outer frame is provided with a first threaded hole which is coaxial and equal to the potting layer, and the antenna cap is fixed in the first threaded hole by threaded tight fit; the top cover and the bottom cover are both provided with a second threaded hole, and the stud is installed in both of the second threaded holes;

[0007] The intelligent monitoring module includes a control circuit board and a current detection circuit, a voltage detection circuit, an antenna circuit, a pulse counting circuit, a power supply circuit and a temperature detection circuit electrically connected to the control circuit board respectively;

[0008] The circuit protection module includes a protection circuit (connected to a control circuit board), a resistor valve sheet and a high-voltage measuring resistor, the resistor valve sheet includes a first resistor valve sheet and a second resistor valve sheet, the first resistor valve sheet and the second resistor valve sheet are connected in series between the top cover and the outer frame, and the high-voltage measuring resistor is located in a second cavity formed between the first resistor valve sheet and the second resistor valve sheet; a third threaded hole is opened at the bottom of the top cover, a first end lead of the high-voltage measuring resistor is installed in the third threaded hole, and a second end lead of the high-voltage measuring resistor is fixed in the threaded hole at the bottom of the bottom cover by a bolt, and the other end of the second end lead (i.e., the end away from the high-voltage measuring resistor) passes through the bottom of the outer frame (the circular hole) to be electrically connected to the control circuit board.

[0009] As a further preferred technical solution of the above technical solution, the intelligent monitoring module also includes a current detection electrode, which is electrically connected to the first resistor valve plate and the second resistor valve plate respectively, and is used to monitor the current; the current detection electrode is a ring structure, and the inner ring is provided with an ear-shaped circular hole, and a wire is led to the ear-shaped circular hole of the inner ring with a wiring terminal, one end of the lead is fixed at the ear-shaped circular hole, and the other end is electrically connected to the current detection circuit.

[0010] As a further preferred technical solution of the above technical solution, the first resistance valve plate and the second resistance valve plate are both annular resistance valve plates, the first resistance valve plate is a high resistance valve plate, and the second resistance valve plate is a low resistance valve plate (the first resistance valve plate (22-a) replaces the traditional cable sheath protector resistance plate to protect the entire device, and the second resistance valve plate (22-b) is used to discharge voltage and protect the entire device);

[0011] The first resistor valve plate and the second resistor valve plate are connected in series to divide voltage. After the first resistor valve plate divides a larger voltage, the voltage measurement circuit measures the voltage on both sides of the second resistor valve plate.

[0012] As a further preferred technical solution of the above technical solution, one end of the antenna circuit is connected to an antenna feeder, and the antenna feeder is built into an internal circular hole of the antenna cap to achieve wireless transmission of monitoring data.

[0013] As a further preferred technical solution of the above technical solution, the power supply circuit is linked with a power supply battery to provide energy.

[0014] As a further preferred technical solution of the above technical solution, the protection circuit includes a varistor RV1 and a varistor RV2, and the varistor RV1 and the varistor RV2 are in a series voltage-dividing relationship;

[0015] The protection circuit and the current detection circuit are connected in series and then connected in parallel to the varistor RV2. The pulse counting circuit and the protection circuit are connected to the control circuit board (the varistor RV1 and RV2 are resistor devices with nonlinear volt-ampere characteristics. The varistor is in a high-resistance state under normal working voltage). When the varistor RV2 is in a high-resistance state, the impedance of the protection circuit and the current detection circuit in series is (much) lower than the impedance of the varistor RV2. (Most of) the current at both ends of the varistor RV2 is shunted by the protection circuit and the current detection circuit. The current detection circuit processes the current signal and outputs it to the control circuit board. The control circuit board performs analog-to-digital conversion on the current signal and obtains the current value after analysis and calculation.

[0016] When overvoltage appears at both ends of the varistor RV1 and RV2 and the varistor is turned on, a large current will pass through the varistor RV1, and the protection circuit will limit the current passing through itself to avoid overcurrent damaging the current detection circuit. Most of the current will be discharged through the varistor RV2; at the same time, when the protection circuit is subjected to a large current shock, it will trigger the pulse counting circuit to output a pulse signal to the control circuit board. After detecting the pulse signal, the control circuit board determines that the varistor is actuated and updates the number of actuations; the temperature detection circuit is connected to the control circuit board and is used to obtain the temperature of the resistor valve sheet inside the core rod.

[0017] As a further preferred technical solution of the above technical solution, epoxy resin is filled in the second cavity (to prevent the first resistor valve sheet (22-a), the second resistor valve sheet (22-b) and the current detection electrode (32) from being soaked in water and causing damage to the electronic components).

[0018] As a further preferred technical solution of the above technical solution, an O-ring is provided between the outer frame and the bottom cover (to prevent components inside the outer frame from being immersed in water).

[0019] The beneficial effects of the present invention are:

[0020] 1. The present invention is based on the currently mature related technologies of cable sheath protectors, and combines the circuit monitoring module with the packaging module 1. The packaging cost is low, the structure is simple, and the reliability is high.

[0021] 2. The present invention can monitor the cable terminal voltage, the number of protector actions, the action time and the action current in real time, and provide accurate data for ground open circuit faults.

[0022] 3. The present invention uses wireless communication technology to achieve remote information transmission of data.

[0023] 4. The present invention has a design of ultra-large breakdown tolerance energy, can operate in a breakdown state for a long time, and has a perfect self-checking function, thus realizing maintenance-free operation of the product during use.

[0024] 5. The design of the intelligent monitoring module can prevent the internal parts of the cable sheath protector from damage. If the new intelligent cable terminator described in the present invention is damaged, it can be solved by replacing the control circuit board, which greatly reduces the cost of use. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 The figure is a schematic diagram of a packaging module of a novel intelligent cable terminator of the present invention.

[0026] Figure 2 The figure is a cross-sectional schematic diagram of a novel intelligent cable terminator of the present invention.

[0027] Figure 3 The figure is a schematic diagram of a control circuit board of a novel intelligent cable terminator of the present invention.

[0028] Figure 4 The figure is a hardware principle block diagram of a novel intelligent cable terminator of the present invention.

[0029] Among them, 11 is a stud, 12 is an end cover, 13 is an outer protective layer, 14 is a potting layer, 15 is a top cover, 16 is an outer frame, 17 is an antenna cap, 18 is a bottom cover, 19 is a sealing ring, a is a first cavity, b is a second cavity, 21 is a protection circuit, 22 is a resistor valve sheet, 22-a is a first resistor valve sheet, 22-b is a second resistor valve sheet, 23 is a high-voltage measuring resistor, 31 is a current detection circuit, 32 is a current detection electrode, 41 is a voltage detection circuit, 51 is an antenna circuit, 52 is an antenna feeder, 61 is a pulse counting circuit, 71 is a power supply circuit, 72 is a power supply battery, 81 is a temperature detection circuit, and 9 is a control circuit board. DETAILED DESCRIPTION

[0030] The following description is used to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments described below are only examples, and those skilled in the art can think of other obvious variations. The basic principles of the present invention defined in the following description can be applied to other embodiments, variations, improvements, equivalents, and other technical solutions that do not deviate from the spirit and scope of the present invention.

[0031] In the preferred embodiments of the present invention, those skilled in the art should note that the cables and the like involved in the present invention may be regarded as prior art.

[0032] Preferred embodiments.

[0033] like Figure 1-4As shown, the present invention discloses a novel intelligent cable terminal protector, comprising a packaging module, a circuit protection module and an intelligent monitoring module, wherein the circuit protection module and the intelligent monitoring module are both built into the packaging module, wherein:

[0034] The encapsulation module comprises a core rod and an outer sheath 13, wherein the outer sheath 13 (partially) surrounds and is installed on the core rod, and the core rod comprises a stud 11, a potting layer 14, a top cover 15, an outer frame, an antenna cap 17 and a bottom cover 18, wherein the top cover 15 is located above the outer frame 16, and both the top cover 15 and the outer frame 16 are provided with a first external thread, which is threadedly connected to the potting layer 14 provided with a first internal thread; the inner wall of the outer frame 16 also has a second internal thread, which is threadedly connected to the bottom cover 18 provided with a second external thread on the outer wall; the side wall of the outer frame 16 is provided with a first threaded hole which is coaxial and equal to the potting layer 14, and the antenna cap 17 is fixed in the first threaded hole by threaded tight fit; both the top cover 15 and the bottom cover 18 are provided with a second threaded hole, and the stud 11 is installed in both of the two second threaded holes; in order to enhance the bonding between the core rod and the outer sheath 13, an annular notch is provided on the side wall of the top cover 15 and the outer frame 16. The end cap 12 is mechanically connected to the upper and lower sides of the outer sheath 13, and finally assembled into a complete packaging module;

[0035] The intelligent monitoring module includes a control circuit board 9 and a current detection circuit 31, a voltage detection circuit 41, an antenna circuit 51, a pulse counting circuit 61, a power supply circuit 71 and a temperature detection circuit 81 (realizing functions such as data measurement and processing analysis, power supply and data communication) electrically connected to the control circuit board 9; the control circuit board 9 is used to manage and control the work of various peripheral devices. The core component of the control circuit board 9 is a microcontroller chip, which is a multi-protocol SoC (system on chip) chip that supports ultra-low power wireless applications;

[0036] The circuit protection module includes a protection circuit 21 (connected to the control circuit board), a resistor valve sheet 22 and a high-voltage measuring resistor 23, the resistor valve sheet 22 includes a first resistor valve sheet 22-a and a second resistor valve sheet 22-b, the first resistor valve sheet 22-a and the second resistor valve sheet 22-b are connected in series between the top cover 15 and the outer frame 16, and the high-voltage measuring resistor 23 is located in the second cavity b formed between the first resistor valve sheet 22-a and the second resistor valve sheet 22-b; a third threaded hole is opened at the bottom of the top cover 15, the first end lead of the high-voltage measuring resistor 23 is installed in the third threaded hole, and the second end lead of the high-voltage measuring resistor 23 is fixed in the threaded hole at the bottom of the bottom cover 18 by bolts, and the other end of the second end lead (i.e., the end away from the high-voltage measuring resistor) passes through the bottom of the outer frame 16 (the circular hole opened therein) and is electrically connected to the control circuit board 9.

[0037] Specifically, the intelligent monitoring module also includes a current detection electrode 32, which is electrically connected to the first resistor valve plate 22-a and the second resistor valve plate 22-b respectively, and is used to monitor the current; the current detection electrode 32 is a ring structure, and the inner ring is provided with an ear-shaped circular hole. A wire is led to the ear-shaped circular hole of the inner ring with a wiring terminal, one end of the lead is fixed at the ear-shaped circular hole, and the other end is electrically connected to the current detection circuit 31.

[0038] More specifically, the first resistance valve plate 22-a and the second resistance valve plate 22-b are both annular resistance valve plates, the first resistance valve plate 22-a is a high resistance valve plate, and the second resistance valve plate 22-b is a low resistance valve plate (the first resistance valve plate (22-a) replaces the traditional cable sheath protector resistance plate to protect the entire device, and the second resistance valve plate (22-b) is used to discharge voltage and protect the entire device);

[0039] The first resistor valve plate 22 - a and the second resistor valve plate 22 - b are connected in series to divide voltage. After the first resistor valve plate 22 - a divides a larger voltage, the voltage measurement circuit 41 measures the voltage on both sides of the second resistor valve plate 22 - b.

[0040] Furthermore, one end of the antenna circuit 51 is connected to an antenna feeder 52 , and the antenna feeder 52 is built into an inner circular hole of the antenna cap 17 , so as to realize wireless transmission of monitoring data.

[0041] Furthermore, the power supply circuit 71 is linked with the power supply battery 72 to provide energy.

[0042] Preferably, the protection circuit 21 includes a varistor RV1 and a varistor RV2, and the varistor RV1 and the varistor RV2 are in a series voltage-dividing relationship;

[0043] The protection circuit 21 and the current detection circuit 31 are connected in series and then connected in parallel to the varistor RV2. The pulse counting circuit 61 and the protection circuit 21 are connected to the control circuit board 9 (the varistors RV1 and RV2 are resistor devices with nonlinear volt-ampere characteristics, and the varistors are in a high-resistance state under normal working voltage). When the varistor RV2 is in a high-resistance state, the impedance of the protection circuit 21 and the current detection circuit 31 connected in series is (much) lower than the impedance of the varistor RV2. (Most of) the current at both ends of the varistor RV2 is shunted by the protection circuit and the current detection circuit 31. The current detection circuit 31 processes the current signal and outputs it to the control circuit board 9. The control circuit board 9 performs analog-to-digital conversion on the current signal and obtains the current value after analysis and calculation.

[0044] When an overvoltage appears at both ends of the varistor RV1 and RV2 and the varistor is turned on, a large current will pass through the varistor RV1, and the protection circuit 21 will limit the current passing through itself to avoid overcurrent damaging the current detection circuit. Most of the current will be discharged through the varistor RV2; at the same time, when the protection circuit 21 is subjected to a large current shock, it will trigger the pulse counting circuit 61 to output a pulse signal to the control circuit board. After detecting the pulse signal, the control circuit board 9 determines that the varistor is actuated and updates the number of actuations; the temperature detection circuit 81 is connected to the control circuit board and is used to obtain the temperature of the resistor valve sheet inside the core rod.

[0045] Preferably, the second cavity b is filled with epoxy resin (to prevent the first resistor valve sheet (22-a), the second resistor valve sheet (22-b) and the current detection electrode (32) from being soaked in water and causing damage to electronic components).

[0046] Preferably, an O-ring 19 is provided between the outer frame 16 and the bottom cover 18 (to prevent components inside the outer frame from being immersed in water).

[0047] The assembly of the packaging module (1) is divided into three steps:

[0048] Step 1: Complete the assembly of the potting layer (14), the top cover (15), the outer frame (16), the bottom cover (18) and the antenna cap (17);

[0049] Step 2: Based on step 1, complete the assembly of the outer sheath (13);

[0050] Step 3: Based on step 2, complete the assembly of the end cover (12).

[0051] Furthermore, the potting layer (14) is mechanically connected to the top cover (15) and the outer frame (16) respectively.

[0052] Furthermore, the outer frame (16) and the bottom cover (18) form a mechanical connection.

[0053] Furthermore, the sealing ring (19) achieves sealing of the first cavity (a).

[0054] Furthermore, the antenna cap (17) and the potting layer (14) form a mechanical connection.

[0055] Furthermore, to ensure the communication effect, the length of the antenna feed line (52) should not be less than 30 mm.

[0056] Furthermore, a threaded hole is opened at the bottom of the outer frame 16, and the control circuit board 9 is fixed inside the first cavity a by bolts.

[0057] It is worth mentioning that the technical features such as cables involved in the patent application of this invention should be regarded as prior art. The specific structure, working principle and possible control method and spatial layout method of these technical features can be selected by conventional methods in the field, and should not be regarded as the inventive point of this patent. This patent will not be further elaborated.

[0058] For those skilled in the art, it is still possible to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A new type of intelligent cable terminal protector, characterized in that: It includes a packaging module, a circuit protection module and an intelligent monitoring module, wherein the circuit protection module and the intelligent monitoring module are both built into the packaging module, wherein: The packaging module comprises a core rod and an outer sheath, wherein the outer sheath surrounds and is installed on the core rod, and the core rod comprises a stud, a potting layer, a top cover, an outer frame, an antenna cap and a bottom cover, wherein the top cover is located above the outer frame, and the top cover and the outer frame are both provided with a first external thread, which is threadedly connected to the potting layer provided with a first internal thread; the inner wall of the outer frame is also provided with a second internal thread, which is threadedly connected to the bottom cover provided with a second external thread on the outer wall; the side wall of the outer frame is provided with a first threaded hole which is coaxial and equal to the potting layer, and the antenna cap is fixed in the first threaded hole by threaded tight fit; the top cover and the bottom cover are both provided with a second threaded hole, and the stud is installed in both of the second threaded holes; The intelligent monitoring module includes a control circuit board and a current detection circuit, a voltage detection circuit, an antenna circuit, a pulse counting circuit, a power supply circuit and a temperature detection circuit electrically connected to the control circuit board respectively; The circuit protection module includes a protection circuit, a resistor valve sheet and a high-voltage measuring resistor, the resistor valve sheet includes a first resistor valve sheet and a second resistor valve sheet, the first resistor valve sheet and the second resistor valve sheet are connected in series between the top cover and the outer frame, and the high-voltage measuring resistor is located in a second cavity formed between the first resistor valve sheet and the second resistor valve sheet; a third threaded hole is opened at the bottom of the top cover, the first end lead of the high-voltage measuring resistor is installed in the third threaded hole, and the second end lead of the high-voltage measuring resistor is fixed in the threaded hole at the bottom of the bottom cover by bolts, and the other end of the second end lead passes through the bottom of the outer frame and is electrically connected to the control circuit board.

2. A new intelligent cable terminal protector according to claim 1, characterized in that: The intelligent monitoring module also includes a current detection electrode, which is electrically connected to the first resistor valve plate and the second resistor valve plate respectively, and is used to monitor the current; the current detection electrode is a ring structure, and the inner ring is provided with an ear-shaped circular hole. A wire is led to the ear-shaped circular hole of the inner ring with a wiring terminal, one end of the lead is fixed at the ear-shaped circular hole, and the other end is electrically connected to the current detection circuit.

3. A new intelligent cable terminal protector according to claim 2, characterized in that: The first resistance valve sheet and the second resistance valve sheet are both annular resistance valve sheets, the first resistance valve sheet is a high resistance valve sheet, and the second resistance valve sheet is a low resistance valve sheet; The first resistor valve plate and the second resistor valve plate are connected in series to divide voltage. After the first resistor valve plate divides a larger voltage, the voltage measurement circuit measures the voltage on both sides of the second resistor valve plate.

4. A new intelligent cable terminal protector according to claim 3, characterized in that: One end of the antenna circuit is connected to the antenna feeder, and the antenna feeder is built into the inner circular hole of the antenna cap to realize wireless transmission of monitoring data.

5. A novel intelligent cable terminal protector according to claim 1, characterized in that: The power supply circuit is linked with the power supply battery to provide energy.

6. A novel intelligent cable terminal protector according to claim 1, characterized in that: The protection circuit includes a varistor RV1 and a varistor RV2, and the varistor RV1 and the varistor RV2 are in a series voltage division relationship; The protection circuit and the current detection circuit are connected in series and then in parallel to the varistor RV2. The pulse counting circuit and the protection circuit are connected to the control circuit board. When the varistor RV2 is in a high-resistance state, the impedance of the protection circuit and the current detection circuit in series is lower than the impedance of the varistor RV2. The current at both ends of the varistor RV2 is shunted by the protection circuit and the current detection circuit. The current detection circuit processes the current signal and outputs it to the control circuit board. The control circuit board performs analog-to-digital conversion on the current signal and obtains the current value after analysis and calculation. When overvoltage appears at both ends of the varistor RV1 and RV2 and the varistor is turned on, a large current will pass through the varistor RV1, and the protection circuit will limit the current passing through itself to avoid overcurrent damaging the current detection circuit. Most of the current will be discharged through the varistor RV2; at the same time, when the protection circuit is subjected to a large current shock, it will trigger the pulse counting circuit to output a pulse signal to the control circuit board. After detecting the pulse signal, the control circuit board determines that the varistor is actuated and updates the number of actuations; the temperature detection circuit is connected to the control circuit board and is used to obtain the temperature of the resistor valve sheet inside the core rod.

7. The novel intelligent cable terminal protector according to claim 1 is characterized in that: The second cavity is filled with epoxy resin.

8. The novel intelligent cable terminal protector according to claim 1 is characterized in that: An O-type sealing ring is arranged between the outer frame and the bottom cover.

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