Cable fault location is no longer difficult

In recent years, in the promotion of urban-rural integration, 10 kV cables often fail
due to the continuous rise of electricity loads.
The location of cable faults caused by old equipment has become the short board of each power supply sub-bureau, which has always plagued the emergency repair team
of each power supply sub-bureau.
In the past, the emergency repair team of the sub-bureau held a bridge to test the fault, and the limitations of this equipment were very large, and it was often difficult to find the fault point
for various reasons.
Usually the load is brought by other lines, and then opened to find, sometimes for several days, seriously affecting the repair of the cable
.
At the same time, due to the variability of the power cable laying and use environment, coupled with the application of various cables and their accessories and new materials in the cable route, the difficulty of on-site fault location of power cables is increasing
.

The difficulty of cable fault location is highlighted in the fault location of directly buried power cable lines
.
At present, for the high-resistance faults of power cable lines, although there are relevant classic technical literature and advanced fault detectors
.
However, when using a professional cable fault locator for positioning on site, sometimes some special difficult faults
that cannot be located will be encountered.
For example, the local creepage flashover fault of the insulating surface of the medium voltage cross-linked power cable terminal and the intermediate head, the precise determination point of the metal short circuit fault, etc.
, often seem powerless or ineffective when using professional cable fault locators
.

For common cable faults, using the market to purchase a cable fault locator can generally determine the location
of the fault point in minutes or hours.
However, when encountering special difficult faults and the detection is not smooth, it may be necessary to call multiple cable fault detectors with different functions to test repeatedly, and take turns to detect and confirm the positioning
.
The types of these fault instruments mainly include a variety of cable fault detectors designed and manufactured according to the principle of bridge method and waveform method, so that positioning may take several days or even longer, in this way, when lucky, you can determine the location of the fault point, when you are unlucky, the location of the fault point can not be determined
.

In the northern region of China, the ground is frozen in winter, so when the direct buried cable fails, the actual fault detection and treatment process is actually quite a difficult work
.
First of all, the cable fault location instrument used must have high accuracy, and secondly, there must be corresponding personnel who understand the actual laying route of the cable more clearly, although some cable fault detection instruments are now equipped with cable path testers, but there must also be on-site personnel who understand the general laying path of the cable to cooperate, in order to improve the accuracy
of positioning.
The actual cable fault handling process sometimes relies on people and machines in seven
.

At present, there are many manufacturers of cable fault detection instruments on the market, and there are various types of detectors, but in fact, all cable faults can not be located
.
In actual use, the instrument is often only effective for locating one or several fault types, and is still helpless for some
faults.
Today's power use departments hope to purchase a fully functional universal cable fault tester with high positioning accuracy (including rough position and precision point function) to quickly and effectively solve all actual cable faults
.
But in reality, it is difficult to
buy.
A wide range of cable fault detectors are constantly being introduced
on the market.
However, the actual inspection on site will still encounter some technical problems
that cannot be located by using the cable fault meter.
I think the reasons mainly come from two aspects: first, the various insulation, filling and wrapping materials used in cables and their accessories are constantly being developed and updated, resulting in continuous changes in the type of cable failure; Second, the market demand for cable fault detectors is limited, and the relevant R & D personnel are scarce, resulting in portable, high-precision, intelligent and multi-functional cable fault detectors being delayed
.
It is believed that with the advent of the era of intelligent power grid and the rapid development of cable fault detection technology, cable fault location will become a very simple and easy thing
.

Cable fault locator is a comprehensive set of cable fault detection instrument, which can test the high-resistance flashover fault, high and low resistance grounding, short circuit and cable breakage, poor contact and other faults of
the cable.
The cable fault locator is equipped with an acoustic legal point instrument, which can be used to accurately determine the precise location of the fault point
.
It is especially suitable for testing various models and different levels of voltage power cables and communication cables
.
1.
Direct buried cable 2.
Hammer (pulse) method 3.
Time domain reflectometry method 4.
Arc reflection method 5.
Fast fault detector 6.
First response

The cable fault locator adopts a variety of detection methods and applies the most advanced electronic technology achievements
of the modern era.
Using computer technology and microelectronics technology, it has the characteristics
of high intelligence, complete functions, wide range of use, accurate testing and easy to use.
The locator design to detect aircraft cable failure is very important in civil aviation operations; According to the characteristics of aircraft cables, a method that can effectively test and diagnose them, a low-voltage pulse method, is proposed, and a single-chip microcomputer and CPLD technology are used to design an aircraft cable defect detection and positioning device.
The locator is mainly composed of three parts, namely: signal acquisition circuit, system control circuit, and human-computer interaction circuit; At the same time, two sets of pinji vibration are adopted, which not only ensures the high-speed acquisition of signals, but also meets the low-speed processing of the system, and has the characteristics of low cost, light and dexterous, and accurate testing; At the same time, in addition to being used in aircraft cable maintenance, it can also be further applied to short-distance cable test defect detection in telecommunications, power and other departments.
How it works

The power cable fault tester is composed of
three main parts: the main engine of the power cable fault tester, the cable fault locator and the cable path instrument.
The cable fault tester host is used to measure the nature of the cable fault, the full length and the approximate position
of the cable fault point from the test end.
The cable fault fixed-point analyzer is to determine the precise location of the cable fault point on the basis of the cable fault tester host determining the approximate location
of the cable fault point.
For buried cables with unknown direction, a pathmeter is used to determine the underground direction
of the cable.
The basic method of power cable fault testing is to generate a breakdown at the fault point of the cable by applying a high-voltage pulse to the faulty power cable, and the cable fault breakdown point discharge at the same time generates electromagnetic waves and emits sound
at the same time.