How to Carry Out Fault Location of High Voltage Cable

The speed of China's economic development is obvious to all. The country's economic development has driven the development of all walks of life, and all kinds of construction work has been strengthened. The construction scale of national power grid is expanding. Although China has also popularized and applied multi-channel high-voltage cable technology, its structure is becoming more and more complex, resulting in multi-channel failure of high-voltage cables. Next, we discuss the problem of fault location of high voltage cable. High voltage power transmission lines have been affected by environmental changes in recent years. The insulation layer of cables is damp due to rainy weather and ponding, the overall overheating in the process of cable use, and the high voltage of cables will not only affect people's power consumption experience, but also cause irreparable loss of economic benefits to relevant power consumption enterprises. How to accurately locate and quickly remedy the fault of multi branch high-voltage transmission line cable has become the focus of power supply departments and power companies. 1、 The construction and analysis of cable simulation model great changes have taken place in the current natural environment, and the natural wear of cable lines is becoming more and more serious in the harsh natural environment. Therefore, the stable and continuous operation of the cable requires the cable protective layer to protect the cable, and the cable protective layer usually plays a key role in protecting the cable. We need to consider the cable, so we should select the power supply equipment matching the cable in the test. However, we should note that when setting the data of the power supply, we need to select the conventional settings of the circuit and resistance, and do not exceed the range borne by the cable. 2、 Simulation and analysis of two-t lines the application of two-t lines is an innovative technology for today's multi branch cable erection, but no country can widely use this technology. We can evaluate the design idea, design scheme, design results and the effect after being put into use in a small scale. We can improve the cable technology in some large cities and areas with complete urban power grid construction. We can transform the original main power supply line into a power supply line of two t lines. If we use this technology, we can increase the investment of the corresponding part in the project and complete it as soon as possible. 3、 Firstly, when the fault location is in Section D, set the fault point in phase a of Section D and carry out the simulation process test. Based on the grounding wire at the beginning of a section, it is concluded that after a problem occurs, the current has a continuous transient process. Then, the metal sheath current that is slowly stable and connected to the fault is large, and the high amplitude reaches 5A. At the same time, the large amplitude of the non fault phase also reaches 1 A. there is no great difference between the current wave detected by this stage and the normal grounding wire. The main route of fault location of high-voltage cable and the route of fault section are cross connected, and the attenuation amplitude of high-frequency voltage will appear after fault. If the insulation layer in the cable breaks down, we can measure the grounding current in different sections and the attenuation amplitude of high-frequency voltage, and analyze the location of cable accident from the measured data.

How to Carry Out Fault Location of High Voltage Cable 1

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Theory of Cable Fault Locator
The basic function of cable fault locator is in the power industry and some industries using cables, especially in some complex power systems. It is very difficult to find the fault of underground cable lines. However, in this regard, the continuous emergence of equipment with various functions and simple operation can not only reduce the high cost of fault detection, but also reduce the inevitable long-time power failure when difficult to find (cable fault locator) cable fault, which brings a lot of convenience to troubleshooting. Direct buried cable fault detection in underground direct buried cable and underground residential power distribution (URD) system is a very time-consuming thing, and will cause very inconvenient power failure to users. Some technologies may also damage the cable. For some equipment with high technical requirements, its operation is more complex, and only operators with strict training can use it, which brings a lot of inconvenience to the popularization and application of this kind of technical equipment. Therefore, the selection of appropriate technology depends partly on the knowledge of cable system design understood by the designer of fault detector, and also partly on the professional and technical knowledge of equipment and operators in this regard. With appropriate equipment and professional technology working on site, it is the first step to detect faults quickly and effectively. Hammering (pulse) method many power companies use hammering (pulse) method. This technique is effective in detecting high resistance faults in a simple (cable fault locator) cable system. The hammering method includes using a pulse or impulse voltage to impact the power cut cable. When an effective high voltage pulse strikes the fault area, the fault point flashover and produces a hammering sound that can be heard by the operator along the cable surface. However, detecting cable faults often requires several hammers, and repeated shocks may damage the cable. Dear customers: Hello, our company is a high-quality development group with strong technical force, providing users with high-quality products, complete solutions and superior technical services. The enterprise adheres to the tenet of building a business in good faith, keeping the business with quality and developing the business with enterprising. It continues to climb new peaks with a firmer pace and make contributions to the national automation industry. New and old customers are welcome to buy their favorite products at ease. We will serve you wholeheartedly!
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