Low-voltage cable fault intelligent fault-finding instrument

Abstract

The utility model discloses a kind of low-voltage cable fault intelligent trouble-finding instruments, belong to electric power low-voltage cable fault detection technical field, including hinged box and box cover, box inside is provided with receiving chamber and detection room, receiving chamber is used to fixed receiver, detection room is used to place detector, receiver and detector are wirelessly connected, receiver includes operating panel and receiver circuit, detector includes current transformer and acquisition box. Compared with prior art, the detector and receiver of the utility model adopt the design way of separation, the signal tested by detector is sent to receiver by wireless signal, without calculation, directly through the zero sequence current size shown by receiver to determine whether there is leakage phenomenon in line, it can guarantee that one person mainly hangs connection operation, one person mainly reads number judgment, reduce operation intensity, also can let operating personnel supervise monitoring in safety aspect, can quickly distinguish fault line and determine leakage position, improve power repair efficiency.

Description

Technical Field

[0001] This utility model belongs to the field of low-voltage power cable fault detection technology, and in particular relates to an intelligent fault finder for low-voltage cables. Background Technology

[0002] In 220V / 380V low-voltage power distribution systems, short circuits and leakage faults are prone to occur in lines or terminal equipment due to aging lines, overload operation, improper construction, or damage from external mechanical forces. Especially in situations where leakage current disconnect switches are not installed, or where existing leakage protection devices have failed, such faults will directly prevent the system from supplying power normally.

[0003] After a fault occurs, it will not only cause a drop in power supply voltage and abnormal power loss, but more seriously, it will create a dangerous step voltage around the grounding point, posing a direct threat to the lives of people and livestock.

[0004] Currently, troubleshooting these types of faults relies heavily on manual experience and traditional methods such as segment-by-segment testing and power-on testing. This approach suffers from problems such as low troubleshooting efficiency, high safety risks, and stringent requirements for the professional skills of maintenance personnel.

[0005] Therefore, in order to solve the above problems, it is urgent to design an intelligent fault finder for low-voltage cables that can quickly, accurately and safely locate low-voltage cable faults, so as to improve the operation and maintenance efficiency and safety of power distribution systems. Utility Model Content

[0006] The technical problem to be solved by this utility model is to overcome the shortcomings of the existing technology and design an intelligent fault finder for low-voltage cables. This intelligent fault finder for low-voltage cables has a simple structure and is easy to use. It can quickly identify and isolate faulty lines without interrupting power supply, thereby reducing the further impact of faulty lines. It solves the problems of low fault finding efficiency and high safety risks in existing low-voltage cable faults.

[0007] The technical solution adopted by this utility model to solve its technical problem is:

[0008] A low-voltage cable fault finding device includes a hinged housing and a housing cover, with a handle provided on the outside of the housing.

[0009] The enclosure contains a receiving chamber and a testing chamber.

[0010] A receiver is fixed in the receiving chamber, and a detector is placed in the detection chamber. The receiver and the detector are wirelessly connected.

[0011] The receiver includes an operation panel and a receiver circuit. The operation panel is fixed inside the housing, and the receiver circuit is disposed between the operation panel and the bottom of the housing.

[0012] The detector includes a current transformer and a data acquisition box, which are connected by wires.

[0013] As a preferred embodiment of this utility model

[0014] The receiver circuit includes a signal receiving circuit, a receiver power supply circuit, a receiver management circuit, and a display circuit.

[0015] The acquisition box is equipped with a signal processing circuit, a detector management circuit, a detector power supply circuit, and a signal transmission circuit.

[0016] Both the signal transmitting circuit and the signal receiving circuit include a 433MHz serial wireless transceiver module.

[0017] The signal receiving circuit and the signal transmitting circuit are wirelessly connected. The receiver power supply circuit is connected to the signal receiving circuit, the receiver management circuit, and the display circuit. The receiver management circuit is connected to both the signal receiving circuit and the display circuit.

[0018] The signal processing circuit is connected to the current transformer, the detector management circuit is connected to the signal processing circuit and the signal transmitting circuit, and the detector power supply circuit is connected to the signal processing circuit, the detector management circuit and the signal transmitting circuit respectively.

[0019] As a preferred embodiment of this utility model

[0020] The operation panel is equipped with a display screen, a power button, a test button, and a battery mounting frame.

[0021] The display screen is connected to the display circuit and is used to display the zero-sequence current value to determine whether there is a leakage current grounding phenomenon in the cable.

[0022] The power button is connected to the receiver power circuit, the test button is connected to the receiver management circuit, and the battery of the receiver power circuit is disposed in the battery fixing frame.

[0023] As a preferred embodiment of this utility model

[0024] The detector management circuit consists of a first microcontroller with first control software and a first peripheral interface circuit. The first control software calculates the detection signal transmitted by the signal processing circuit, converts the detection signal into three-phase current and zero-sequence current digital signals, and transmits them to the receiver through the radio waves of the wireless transceiver module.

[0025] The receiver management circuit consists of a second microcontroller with second control software and a second peripheral interface circuit. The second control software processes and calculates the radio waves received by the wireless transceiver module, extracts the three-phase current and zero-sequence current digital signals, and displays them through the display circuit.

[0026] As a preferred embodiment of this utility model

[0027] The signal processing circuit includes an analog-to-digital converter and peripheral circuits, used to filter and amplify the current signal tested by the current transformer, and then convert it into a digital signal and transmit it to the detector management circuit.

[0028] As a preferred embodiment of this utility model

[0029] The current transformer is a clamp-on current transformer.

[0030] As a preferred embodiment of this utility model

[0031] Four current transformers are provided, which are used to connect the three-phase lines and the neutral line respectively.

[0032] As a preferred embodiment of this utility model

[0033] The detection chamber is equipped with an engineering plastic box, and the detector is placed inside the engineering plastic box.

[0034] The lid has a shock-absorbing foam pad on the side near the box body.

[0035] As a preferred embodiment of this utility model

[0036] The collection box is made of waterproof plastic.

[0037] As a preferred embodiment of this utility model

[0038] The battery mounting frame is equipped with a battery replacement cover at the corresponding position.

[0039] Compared with the prior art, the present invention has the following beneficial effects:

[0040] 1. This utility model adopts a separate wireless design for the detector and receiver, using a 433MHz wireless communication module for signal transmission. It supports a collaborative operation mode with one operator and one monitor, effectively ensuring operator safety and significantly improving on-site work efficiency. The innovative clamp-on current transformer design allows the detection process to proceed without disconnecting the power supply, maximizing power continuity and making it particularly suitable for applications sensitive to power outages. The intuitive zero-sequence current display system allows operators to accurately determine the line status without complex calculations; a zero value indicates normal operation, while a non-zero value directly reflects the severity of grounding, significantly lowering the professional barrier to entry for operation.

[0041] 2. This utility model is equipped with four independent clamp-on current transformers, which can be flexibly adapted to various power distribution structures such as three-phase four-wire, three-phase three-wire and single-phase lines. Different lines can be tested without changing the equipment, which greatly expands the scope of application of the equipment.

[0042] 3. This utility model adopts multiple protective designs such as engineering plastic box, waterproof collection box and shockproof foam pad to ensure stable and reliable operation of the equipment during transportation and in harsh outdoor environments.

[0043] 4. User-friendly test buttons, convenient battery replacement cover, and other detailed designs further enhance the on-site user experience and maintenance convenience of the equipment. Attached Figure Description

[0044] Figure 1 This is a schematic diagram of the structure of an intelligent fault finder for low-voltage cables proposed in this utility model;

[0045] Figure 2 This is a schematic diagram of the structure of a low-voltage cable fault intelligent obstacle finder detector proposed in this utility model;

[0046] Figure 3 This is a schematic diagram illustrating the use of the intelligent fault finder detector for low-voltage cables proposed in this utility model.

[0047] Figure 4 This is a partial schematic diagram of an intelligent fault finder for low-voltage cables proposed in this utility model.

[0048] Explanation of reference numerals in the attached figures:

[0049] 1. Current transformer; 10. Acquisition box; 11. Receiver; 110. Operation panel; 111. Display screen; 112. Power button; 113. Test button; 114. Battery fixing frame; 115. Battery replacement cover; 2. Box cover; 12. Detector; 122. Wire; 123. Engineering plastic box; 13. Handle; 3. Box body. Detailed Implementation

[0050] The specific embodiments of this utility model are described below with reference to the accompanying drawings and examples:

[0051] It should be noted that the structures, colors, proportions, sizes, etc. shown in the accompanying drawings are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed in the specification, and are not intended to limit the conditions under which the present invention can be implemented. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and purposes that the present invention can produce, should still fall within the scope of the technical content disclosed in the present invention.

[0052] Meanwhile, the terms such as "upper", "lower", "left", "right", "middle" and "one" used in this specification are only for clarity of description and are not intended to limit the scope of implementation of this utility model. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered as within the scope of implementation of this utility model.

[0053] This utility model discloses an intelligent fault finder for low-voltage cables, integrating a detector 12 and a receiver 11 into a portable housing. It is simple to operate, requires no external power supply, and is suitable for field operations. The overall structure is lightweight, waterproof, and pressure-resistant, adapting to transportation and outdoor environmental requirements. This device can quickly identify, diagnose, and isolate faulty lines without power interruption, effectively reducing further impact from the fault.

[0054] like Figures 1-4 As shown, the enclosure specifically includes a hinged housing 3 and a lid 2. A handle 13 is provided on the outside of the housing 3 for easy carrying by personnel. The housing 3 contains a receiving chamber and a detection chamber. The receiving chamber is used to secure the receiver 11, and the detection chamber is used to house the detector 12. The receiver 11 and its circuitry are installed inside the portable housing 3. When not in use, the detector 12 can be stored in a compartment separated by an engineering plastic box 123, which is lined with shock-absorbing foam padding. The entire enclosure possesses pressure-resistant, moisture-proof, and impact-resistant properties, making it suitable for outdoor use.

[0055] A wireless connection is established between receiver 11 and detector 12 via a 433MHz wireless transceiver module. Receiver 11 includes an operation panel 110 and a receiver circuit. The operation panel 110 is fixed inside the housing 3, and the receiver circuit is located between the operation panel 110 and the bottom of the housing 3. Detector 12 includes a current transformer 1 and a data acquisition box 10. The current transformer 1 and the data acquisition box are connected by a wire 122. A wireless connection is established between receiver 11 and detector 12 via their internal 433MHz wireless transceiver module.

[0056] The detector 12 and receiver 11 are designed separately. The signal tested by the detector 12 is transmitted to the receiver 11 wirelessly. Without calculation, the presence of leakage in the line can be determined directly by the magnitude of the zero-sequence current displayed by the receiver 11. This design ensures that one person is mainly responsible for the connection operation and another person is mainly responsible for reading and judging, reducing the workload of the operation. It also allows the operator to supervise and monitor for safety, quickly identify the faulty line and determine the location of the leakage, and improve the efficiency of power emergency repair.

[0057] The receiver circuit includes a signal receiving circuit, a receiver power supply circuit, a receiver management circuit, and a display circuit. The acquisition box 10 is equipped with a signal processing circuit, a detector 12 management circuit, a detector 12 power supply circuit, and a signal transmitting circuit.

[0058] Preferably, the acquisition box 10 is equipped with necessary power switch buttons and backlight buttons on its outer side. The power switch buttons are used to control the opening and closing of the acquisition box, and the backlight buttons are used to turn the backlight function of the instrument screen on / off so that the operator can clearly view the detection data on the screen in a low-light environment, ensuring that the equipment can read information normally under various lighting conditions, improving the convenience of operation and the accuracy of data reading.

[0059] Both the signal transmitting circuit and the signal receiving circuit include a 433MHz serial wireless transceiver module.

[0060] The signal receiving circuit and signal transmitting circuit are wirelessly connected. The receiver power supply circuit is connected to the signal receiving circuit, receiver management circuit, and display circuit respectively, and is used to process the battery voltage to supply power to the signal receiving circuit, receiver management circuit, and display circuit. The receiver management circuit is connected to the signal receiving circuit and display circuit.

[0061] The signal processing circuit is connected to the current transformer 1, the detector 12 management circuit is connected to the signal processing circuit and the signal transmitting circuit, and the detector 12 power supply circuit is connected to the signal processing circuit, the detector 12 management circuit and the signal transmitting circuit respectively, and is used to process the battery voltage and supply it to the signal processing circuit, the detector 12 management circuit and the signal transmitting circuit.

[0062] The operation panel 110 is equipped with a display screen 111, a power button 112, a test button 113, and a battery fixing frame 114. The display screen 111 is connected to the display circuit and is used to display the zero-sequence current value to determine whether there is leakage or grounding in the cable. The value of the zero-sequence current displayed by the receiver 11 is used as the basis. If the value is zero, the line is normal. If the value is not zero, it is determined that there is grounding in the line. The larger the value, the more serious the grounding.

[0063] The power button 112 is connected to the receiver power circuit, and the test button 113 is connected to the receiver management circuit. Pressing the test button sends a command to the detector 12, triggering a single detection and data transmission, which helps to obtain stable readings in complex environments and saves power. The battery for the receiver power circuit is housed within the battery holder 114.

[0064] The detector 12 management circuit consists of a first microcontroller with first control software and a first peripheral interface circuit. The first control software calculates the detection signal transmitted by the signal processing circuit, converts the detection signal into three-phase current and zero-sequence current digital signals, and transmits them to the receiver 11 through the radio waves of the wireless transceiver module.

[0065] The receiver management circuit consists of a second microcontroller with second control software and a second peripheral interface circuit. The second control software processes and calculates the radio waves received by the wireless transceiver module, extracts the three-phase current and zero-sequence current digital signals, and displays them through the display circuit.

[0066] The signal processing circuit includes an analog-to-digital converter and peripheral circuits, which are used to filter and amplify the current signal tested by the current transformer 1, and then convert it into a digital signal and transmit it to the detector 12 management circuit.

[0067] In this embodiment, the current transformer 1 is a clamp-on current transformer 1, and its magnetic circuit part is designed to be openable and closable. It can be directly clamped to the conductor 122 under test for detection without disconnecting the power supply to the line, realizing live operation and significantly improving the convenience of detection and operation efficiency.

[0068] like Figures 2-3 As shown, four current transformers 1 are provided, which are used to connect the three-phase lines and the neutral line respectively. In this embodiment, the current transformers 1 include A-phase current transformer 1, B-phase current transformer 1, C-phase current transformer 1, and neutral line current transformer 1. The four current transformers 1 of the detector 12 are connected to the three-phase lines A, B, and C and the neutral line N respectively in the same direction. The signal tested by the acquisition box 10 of the detector 12 is transmitted wirelessly to the receiver 11 of the low-voltage cable fault intelligent fault finder.

[0069] The testing chamber is equipped with an engineering plastic box 123, and the detector 12 is placed inside the engineering plastic box 123. The testing chamber is equipped with an inner box made of engineering plastic, in which the detector 12 can be securely placed when not in use.

[0070] The lid 2 has a shock-absorbing foam pad on the side near the body 3. This effectively cushions impacts and protects the delicate electronic components inside during the closing of the body 3 or during transportation.

[0071] The data acquisition box 10 is made of waterproof plastic. Its excellent sealing ensures that the detector 12 can still function normally in complex outdoor weather conditions. The receiver 11 housing 3 is also made of engineering plastic, possessing overall characteristics of pressure resistance, moisture resistance, and impact resistance.

[0072] A battery replacement cover 115 is provided at the corresponding position of the battery mounting frame 114 for easy battery replacement. The test button 113 is connected to the receiver management circuit.

[0073] Example 1:

[0074] This embodiment provides the basic structure of an intelligent fault finder for low-voltage cables. For example... Figure 1 As shown, the obstacle finder includes a portable housing 3, which is connected to the cover 2 via a hinge. A handle 13 is fixed to the outside of the housing 3. The interior of the housing 3 is divided into a receiving chamber and a detection chamber by a partition.

[0075] A receiver 11 is fixed inside the receiving chamber. The receiver 11 consists of an operation panel 110 and a receiver circuit. The operation panel 110 is fixed inside the housing 3, and the receiver circuit is located in the space between the operation panel 110 and the bottom of the housing 3. A detector 12 is placed inside the detection chamber. The detector 12 consists of four clamp-on current transformers 1 and a data acquisition box 10. The transformers and the data acquisition box 10 are connected by wires 122. A wireless connection is established between the receiver 11 and the detector 12 through its internal 433MHz wireless transceiver module.

[0076] During operation, the operator opens the box cover 2 and removes the detector 12 from the testing chamber. Four clamp-on current transformers 1 are respectively clamped onto the A, B, and C phases of the circuit under test and the neutral line N. After the detector 12 is powered on, the current signals induced by the clamp-on current transformers 1 are sent to the signal processing circuit in the acquisition box 10 for filtering, amplification, and analog-to-digital conversion. Subsequently, the first microcontroller in the detector 12's management circuit runs the first control software to calculate the digital signals, obtain the three-phase current and zero-sequence current digital signals, and transmit them through the wireless signal transmission circuit.

[0077] The receiver 11, located in the receiving room, acquires the wireless signal through its signal receiving circuit. The second microcontroller in the receiver management circuit runs second control software to analyze and calculate the signal, ultimately displaying the zero-sequence current value in real time on the display screen 111 of the operation panel 110. Operators can determine whether there is a leakage grounding fault in the line simply by checking whether the zero-sequence current value is zero or excessive, without any calculations, thus achieving rapid location of the fault.

[0078] Example 2:

[0079] When the circuit under test is a three-phase four-wire system, the operator will clamp the four clamp-on current transformers 1 onto the A, B, C phases and the neutral line in sequence, ensuring that all clamps are in the same direction, and then normal testing can be performed.

[0080] When the circuit under test is a three-phase three-wire system without a neutral wire, the operator will keep the clamp-on current transformer 1 marked for the neutral wire N closed and unused, and only use the other three transformers to clamp the three-phase circuit. The equipment management software will automatically adapt to this testing mode.

[0081] When the line under test is a single-phase line with one phase and one neutral, the operator only needs to use one corresponding phase line transformer and one neutral line transformer, and keep the remaining two phase line transformers closed and unused to carry out the test.

[0082] Through the coordination of hardware and software, a single set of equipment can flexibly handle various common low-voltage power distribution line structures, greatly improving the equipment's applicability and work efficiency. Operators do not need to carry multiple testing tools; they can complete fault diagnosis for different lines through simple operation switching.

[0083] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A low-voltage cable fault intelligent fault finder, comprising a hinged box (3) and a box cover (2), wherein a handle (13) is provided on the outside of the box (3). Its features are, The box (3) is equipped with a receiving chamber and a testing chamber. A receiver (11) is fixed in the receiving chamber, and a detector (12) is placed in the detection chamber. The receiver (11) and the detector (12) are wirelessly connected. The receiver (11) includes an operation panel (110) and a receiver circuit. The operation panel (110) is fixed inside the housing (3), and the receiver circuit is located between the operation panel (110) and the bottom of the housing (3). The detector (12) includes a current transformer (1) and a data acquisition box (10), which are connected by a wire (122).

2. The intelligent fault finder for low-voltage cables as described in claim 1, Its features are, The receiver circuit includes a signal receiving circuit, a receiver power supply circuit, a receiver management circuit, and a display circuit. The acquisition box (10) is equipped with a signal processing circuit, a detector (12) management circuit, a detector (12) power supply circuit, and a signal transmission circuit. Both the signal transmitting circuit and the signal receiving circuit include a 433MHz serial wireless transceiver module. The signal receiving circuit and the signal transmitting circuit are wirelessly connected. The receiver power supply circuit is connected to the signal receiving circuit, the receiver management circuit, and the display circuit. The receiver management circuit is connected to both the signal receiving circuit and the display circuit. The signal processing circuit is connected to the current transformer (1), the detector (12) management circuit is connected to the signal processing circuit and the signal transmitting circuit, and the detector (12) power supply circuit is connected to the signal processing circuit, the detector (12) management circuit and the signal transmitting circuit respectively.

3. The intelligent fault finder for low-voltage cables as described in claim 2, Its features are, The operation panel (110) is provided with a display screen (111), a power button (112), a test button (113), and a battery fixing frame (114). The display screen (111) is connected to the display circuit and is used to display the zero-sequence current value to determine whether there is a leakage grounding phenomenon in the cable. The power button (112) is connected to the receiver power circuit, the test button (113) is connected to the receiver management circuit, and the battery of the receiver power circuit is disposed in the battery fixing frame (114).

4. The intelligent fault finder for low-voltage cables as described in claim 2, Its features are, The detector (12) management circuit consists of a first microcontroller with first control software and a first peripheral interface circuit. The first control software calculates the detection signal transmitted by the signal processing circuit, converts the detection signal into three-phase current and zero-sequence current digital signals, and transmits them to the receiver (11) through the radio waves of the wireless transceiver module. The receiver management circuit consists of a second microcontroller with second control software and a second peripheral interface circuit. The second control software processes and calculates the radio waves received by the wireless transceiver module, extracts the three-phase current and zero-sequence current digital signals, and displays them through the display circuit.

5. A low-voltage cable fault intelligent fault finder as described in claim 2, Its features are, The signal processing circuit includes an analog-to-digital circuit and peripheral circuits, which are used to filter and amplify the current signal tested by the current transformer (1), and convert it into a digital signal and transmit it to the detector (12) management circuit.

6. The intelligent fault finder for low-voltage cables as described in claim 1, Its features are, The current transformer (1) is a clamp-on current transformer (1).

7. The intelligent fault finder for low-voltage cables as described in claim 1, Its features are, The current transformer (1) is provided in four parts, which are used to connect the three-phase line and the neutral line respectively.

8. The intelligent fault finder for low-voltage cables as described in claim 1, Its features are, The detection chamber is equipped with an engineering plastic box (123), and the detector (12) is placed inside the engineering plastic box (123). The lid (2) has a shock-absorbing foam pad on the side near the box body (3).

9. A low-voltage cable fault intelligent fault finder as described in claim 1, Its features are, The collection box (10) is made of waterproof plastic.

10. A low-voltage cable fault intelligent fault finder as described in claim 3. Its features are, The battery fixing frame (114) is equipped with a battery replacement cover (115) at the corresponding position.

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