Power cable fault rapid detection method

Abstract

The invention discloses a power cable fault rapid detection method, which is based on a pulse reflection principle, transmits a high-frequency and short-pulse signal to an underground buried power cable, receives an echo signal reflected by a fault point at the other end, and measures the time difference between the transmitted signal and the received echo signal to detect the fault of the power cable. The position of a fault point is accurately calculated in combination with the known propagation speed of a signal in the cable; according to the method, complexity and time consumption of traditional manual detection are avoided, and the detection efficiency and accuracy are greatly improved; meanwhile, auxiliary means such as electromagnetic induction and sound detection are used for further narrowing the search range, and accurate positioning of fault points is achieved. The method is suitable for underground buried power cables of various types, specifications and materials, has the advantages of being efficient, accurate, capable of manually and accurately exposing fault points and the like, has important significance for guaranteeing safe and stable operation of a power system, further reduces maintenance cost and influences on the environment, and has important practical value and social and economic benefits.

Description

Technical Field

[0001] The present invention relates to the field of power system maintenance and detection technology, and in particular to a rapid detection method for sudden faults of underground buried power cables during operation. The present invention aims to provide a trenchless, efficient and accurate power cable fault detection method to quickly locate and repair the fault point and restore power supply. Background Art

[0002] As an important infrastructure for power transmission, the safe and stable operation of power cables is crucial to ensuring the reliability of power supply. However, in actual operation, due to various reasons (such as aging, overload, cable quality, etc.), cables may suddenly fail, resulting in power outages. Traditional fault detection methods mainly rely on manual inspections along the line, which is not only time-consuming and labor-intensive, but also has limited accuracy. Especially in complex terrain or hard-to-reach areas, such as corners, detection is extremely difficult, which seriously affects the speed of fault repair and power supply restoration efficiency. Summary of the invention

[0003] In view of the problems existing in the prior art, the present invention proposes a method for rapid detection of power cable faults. The method is based on the principle of pulse reflection. A pulse signal is sent into the cable, and the characteristics of the signal propagating in the cable and reflecting at the fault point are utilized. Combined with time difference calculation, the fault point can be accurately located.

[0004] To achieve the above objectives, the present invention is implemented through the following technical solutions.

[0005] A method for quickly detecting power cable faults comprises the following specific steps:

[0006] a) Pulse signal emission: A pulse generator is used to emit a high-frequency, short pulse signal into the power cable to be tested. The signal propagates along the cable conductor and is reflected when encountering a fault point, forming an echo signal;

[0007] b) Echo signal reception: A receiver is set at the other end of the cable or at an appropriate location to capture the echo signal reflected from the fault point in the cable and record the time when the pulse signal is transmitted and the time when the echo signal is received;

[0008] c) Time difference calculation and distance determination: Based on the known propagation speed of the pulse signal in the cable, the time difference between the transmitted pulse signal and the received echo signal is calculated, and the actual distance between the fault point and one end of the cable is calculated;

[0009] d) Accurately locate the fault point: Combined with the cable laying route map, use the distance information calculated in step c), combined with auxiliary means of electromagnetic induction and acoustic detection, further narrow the search range and directly determine the exact location of the fault point.

[0010] Furthermore, the method is applicable to underground power cables of various types, specifications and materials.

[0011] By implementing the method of the present invention, the effect is:

[0012] 1. Improve detection efficiency: Compared with the traditional manual detection method, the present invention greatly shortens the detection time and improves the detection efficiency;

[0013] 2. Improve positioning accuracy: Through time difference calculation, the fault point can be accurately located, reducing the possibility of misjudgment and missed judgment;

[0014] 3. Reduce maintenance costs: avoid large-scale excavation and manpower investment, reduce maintenance costs and environmental impact;

[0015] 4. Enhance power supply reliability: Quickly locate and repair faults, which helps to quickly restore power supply and improve the stability and reliability of the power system. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 The present invention is a flowchart of an implementation of a method for rapid detection of power cable faults. DETAILED DESCRIPTION

[0017] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0018] Example:

[0019] Principle: This technical solution utilizes the characteristics of pulse technology propagation in cables. A pulse signal is sent into the cable. The signal propagates along the conductor in the cable and is reflected when encountering a fault point (such as a breakpoint, short circuit point, etc.), forming an echo signal. By measuring the time difference between the transmitted signal and the received echo signal, combined with the propagation speed of the signal in the cable, the location of the fault point can be accurately calculated.

[0020] Technical solution steps

[0021] 1. Preparation

[0022] Confirm the model, specification and material of the cable to be tested, as well as the laying path and length of the cable;

[0023] Prepare testing equipment such as pulse generators, receivers, signal processors, and ensure that the equipment is in good working condition;

[0024] Connect the pulse generator at one end of the cable and the receiver at the other end, making sure the connection between the device and the cable is good;

[0025] 2. Pulse signal transmission

[0026] Use a pulse generator to transmit a high-frequency, short pulse signal into the cable;

[0027] Record the time when the pulse signal is emitted so as to calculate the time difference later;

[0028] 3. Echo signal reception and processing

[0029] The receiver captures the echo signal reflected from the fault point in the cable;

[0030] Record the moment when the echo signal is received, and calculate the time difference between the transmitted pulse signal and the received echo signal;

[0031] The signal processor is used to filter and amplify the received echo signal to improve the signal-to-noise ratio and clarity;

[0032] 4. Distance calculation and fault point location

[0033] Calculate the actual distance between the fault point and one end of the cable based on the known propagation speed of the pulse signal in the cable;

[0034] Combined with the cable laying route map, the approximate location of the fault point is preliminarily determined using the calculated distance information;

[0035] By using auxiliary means such as electromagnetic induction and acoustic detection, the search range can be further narrowed and the exact location of the fault point can be directly determined.

[0036] 5. Fault point confirmation and repair

[0037] After determining the location of the fault point, carry out necessary excavation or inspection to confirm the specific situation of the fault point;

[0038] Take appropriate repair measures according to the type and severity of the fault point, such as replacing damaged parts, repairing joints, etc.;

[0039] Once the repair is complete, perform the necessary testing and verification to ensure the cable is back in working order.

[0040] Technical solution features

[0041] High efficiency: Compared with traditional manual detection methods, this method greatly shortens the detection time and improves the detection efficiency.

[0042] Accuracy: Through time difference calculation and distance determination, the fault point is accurately located, reducing the possibility of misjudgment and missed judgment.

[0043] Trenchless: Avoids large-scale excavation and manpower investment, reduces maintenance costs and impact on the environment.

[0044] Applicability: Suitable for underground power cables of various types, specifications and materials, including but not limited to polyethylene insulated cables, cross-linked polyethylene insulated cables, etc.

[0045] In summary, the present technical solution provides an efficient, accurate and trenchless method for rapid detection of power cable faults, which is of great significance for ensuring the safe and stable operation of the power system.

[0046] The present invention and its embodiments are described above, and such description is not restrictive. The drawings show only one embodiment of the present invention, and the actual structure is not limited thereto. In short, if ordinary technicians in the field are inspired by it, without departing from the purpose of the invention, they can design a structure and embodiment similar to the technical solution without creativity, which should belong to the protection scope of the present invention.

Claims

1. A method for rapid detection of power cable faults, characterized in that: The specific steps include: a) Pulse signal emission: A pulse generator is used to emit a high-frequency, short pulse signal into the power cable to be tested. The signal propagates along the cable conductor and is reflected when encountering a fault point, forming an echo signal; b) Echo signal reception: A receiver is set at the other end of the cable or at an appropriate location to capture the echo signal reflected from the fault point in the cable and record the time when the pulse signal is transmitted and the time when the echo signal is received; c) Time difference calculation and distance determination: Based on the known propagation speed of the pulse signal in the cable, the time difference between the transmitted pulse signal and the received echo signal is calculated, and the actual distance between the fault point and one end of the cable is calculated; d) Accurately locate the fault point: Combined with the cable laying route map, use the distance information calculated in step c), combined with auxiliary means of electromagnetic induction and acoustic detection, further narrow the search range and directly determine the exact location of the fault point.

2. A method for rapid detection of burst points of power cables according to claim 1, characterized in that: This method is applicable to underground power cables of various types, specifications and materials.

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