What are the wiring steps for a cable fault tester?

First of all, when you use the cable fault tester, you must understand whether its terminal port is normal, such as whether there is a rust problem, whether there is an aging problem, if these problems occur, you also need to replace the wire in time, before you can continue to use it, even if you know what the specific experience is, it will affect the entire detection effect after it is connected, and even say that the detected data is very inaccurate, then it will only bring more trouble to yourself. Therefore, when you need to understand its terminal before wiring, see if it is aging or rusty, and if so, you need to replace it in time to ensure the specific detection effect.

Secondly, what are the wiring steps of the cable fault tester, but when wiring, you can operate according to the specific operation steps of the instruction manual. Each wiring step is very clearly listed in the instruction manual, as long as you read the instruction manual, you can complete the wiring of the cable fault tester in a very short time, and you can achieve a very good detection effect within a few minutes. Therefore, you can also know what the wiring steps of the cable fault tester are, and it will be very helpful for the whole line detection after figuring it out.

Respondent: Huatian Power.

The most direct cause of cable failure is breakdown due to reduced insulation. There are many factors that lead to the reduction of insulation, and cable faults can be summarized into three categories: grounding, short circuit, and wire breakage.

The working principle of the power cable fault tester: The power cable fault tester is mainly composed of three parts: the power cable fault tester host, the cable fault locator and the cable path tester.

The cable fault tester host is used to measure the nature of the cable fault, the full length of the cable fault, and the approximate location from the test end to the cable fault point; The Cable Fault Locator is based on the approximate location of the cable fault point determined by the host. cable fault tester; For buried cables with unknown directions, determine the exact location of the cable fault point. The underground direction of the cable needs to be determined by the path meter.

The basic method of power cable fault detection is to apply a high-voltage pulse to the faulty cable, so that the faulty cable can break down at the fault point, and the breakdown point of the cable fault can produce electromagnetic waves and sound at the same time when discharged.

The working principle of the application of the arc reflectometry (secondary pulse method) in the positioning of the cable fault tester: firstly, a certain voltage level and a certain energy high-voltage pulse are applied to the fault cable at the cable test end, so that the high resistance fault point of the cable can penetrate the arc; At the same time, when a low-voltage pulse is added to the test end, an arc is encountered and the arc surface is reflected when the measurement pulse reaches the high resistance fault point of the cable. Because the high-resistance fault becomes an instantaneous short-circuit fault when the arc is ignited, the low-voltage measurement pulse has obvious impedance characteristics, which makes the flashover measurement waveform become a low-voltage pulse short-circuit waveform, making the waveform identification very simple and clear, which is called the "secondary pulse method".

The received low-voltage pulse reflection waveform is equivalent to the full short-circuit waveform of the core to ground. When the high-voltage pulse is released and the low-voltage pulse waveform is not released, both waveforms will have a divergence point, that is, the reflected waveform point of the fault point; This method combines the low-voltage pulse method with the high-voltage flashover technique, making it easier for testers to locate the point of failure.

Respondent: Huatian Power.

1. The principle of medium and low voltage cable fault tester

Medium and low voltage cable fault tests are divided into three types according to different test principles:

The first is to use the pulse reflection method test principle for rough fault measurement, and use special high-voltage accessories to match the fault fixed-point, such as using a special high-voltage test power supply with a lower voltage level, using a large-capacity pulse capacitor, etc., which is basically the same as the traditional cable fault tester;

the second is to use the step voltage test method for fault testing;

The third is to test with the principle of bridge testing. Most of the medium and low voltage cable detectors circulating on the market are to complete the rough detection of cable faults. The principle is generally the use of the bridge method, but now computer technology has been adopted, and the intelligent bridge is used.

There are low-voltage bridges, high-voltage bridges, and so on. Some instruments also use the principle of ultra-high voltage digital bridges. The voltage added to the fault point is generally more than 200V, and the maximum can be increased to 20kV.

For faulty cable faults with low resistance (resistance less than 600m). The fault distance can be roughly measured with a medium and low voltage cable detector.

Application: It is suitable for leakage fault testing with low fault resistance value. Generally, it is used for cable fault testing below 6000V "Rough Fault Distance Measurement".

cable fault tester;

Second, the characteristics of the medium and low voltage cable fault tester

Advantages: For the cable fault that adapts to the test, it is simple to use, and the technical requirements for the user are not high. i.e. a "fool" test.

In addition, for some fault points, such as some cable joint faults, due to the long creepage distance of the fault point, the fault of "flashover" discharge can not be formed, and because the fault distance can not be measured by pulse reflection method (flash measurement method), the bridge method test has its advantages.

Disadvantages: It can only test the leakage fault of medium and low voltage cables, and cannot be directly tested for most of the high resistance faults, flashover faults, wire break faults, and faults that do not know the full length of the cable.

The cable fault tester adopts DC high-voltage flashover method, pulsed high-voltage inductance sampling method, pulsed high-voltage current sampling method, low-voltage pulse method and other test methods. It is suitable for the measurement of low resistance, short circuit, open circuit fault, high resistance leakage and high resistance flashover fault of power cables and high-frequency coaxial cables with different cross-sections, different media and materials. It can also be used to detect short-circuit, open-circuit, and mixed-wire faults of local cables, as well as for calibration of the full length of cables.

Cable Fault Tester Find Out How to Cable Fault:

1. It has the traditional impact high-voltage flashover method and the low-voltage pulse method with high-voltage equipment.

2. Any high-impedance fault has a simple waveform characteristic similar to a low-voltage pulse short-circuit fault, which is easy to identify.

3. The cable fault detector mainly finds the fault point through four parts: the cable fault location host, the locator, the pathfinder and the high-voltage signal generator.

Cable fault detector is a new type of fault detection tool, which detects line faults and maintains various cables through a variety of fault detection methods. When using a cable fault tester, be sure to pay attention to some details.

1. It can not only rely on the data obtained by the instrument to make judgments, but also need to consider the actual situation, such as historical faults and joint conditions.

2. If suspicious points are observed on the outer surface of the cable, the correct record after the installation of the cable is completed should be consulted.

3. The exact location of the tee joint, the direction of the cable path, the position of another cable or connector in the relationship between the cable and the underground, and the exact location of two cables and connectors with different cross-sectional areas.

In the operation of using a cable fault test instrument, the details must pay attention to the issues related to the accuracy of the problem, and the cable fault tester cannot be relied on completely, and some places still need to check in person whether it is guaranteed or not.

Respondent: Huatian Power.

There are a few details to be aware of.

1. Not only can we rely on the data obtained by the cable fault tester to make a judgment, but also need to take into account the actual situation, such as historical faults, as well as the joint situation.

2. If a suspicious point is observed outside the cable, check the correct records after completing the cable installation and laying work.

3. The location of the tee joint, the direction of the cable channel, the underground relationship, the condition of one cable and another cable or joint, and the position of the joint of the cable in two different cross-sectional areas.

Attention to detail must be taken when operating a cable fault tester, which is related to accuracy issues and cannot be relied solely on cable fault testers. In some places, you need to check it yourself to be sure.

First of all, the cable should be discharged several times. Because the cable is a capacitive device, there is a certain charge and does not discharge, which is easy to hurt people and damage the fault tester.

Several test methods for cable fault testers.

1.Low Voltage Impulse Test Method.

This cable fault tester is mainly used to test the resistance of electromagnetic waves during the test process. And in the process of testing, it is basically tested through his structure. Moreover, in the process of testing, there is no connection between the general data and the data and usage effect of the test.

This general data will be more accurate in the course of testing.

High Voltage Test Method.

In the process of using this method, some of the resistance of the cable is mainly used for testing, but it will generally be more convenient in the process of using this method, and it will be more convenient in the process of use. In the process of using this method, we must pay attention to the analysis of some details on the equipment, try to try several times in the process of testing, ensure the accuracy of the data in the process of use, and then test, so that the use effect will generally be better.

At present, these two most commonly used methods in the use of cable fault testers are these, so they can also be checked according to their own use requirements, so that I can give full play to their advantages in the process of use.

A cable fault tester's method of finding the point of failure.

1. Capacitance current measurement method.

In cable operation, there is capacitance between the cores and between the cores. The capacitance is evenly distributed, and the capacitance is linearly proportional to the length of the cable. The capacitance current measurement method is based on this principle, and the measurement of cable core disconnection faults is very accurate.

2.Acoustic methods.

Search based on the sound of faulty cable discharge. This method is effective for flashover discharge of high-voltage cable cores to the insulating layer. Method: The wire and cable test equipment used in this method is a DC withstand voltage tester.

3.Bridge Road Law.

According to the proportional relationship between the length of the cable and the resistance. This method is generally not more than 3m for the fault of direct short circuit between cable cores or the contact resistance of the short circuit point is less than 1. For faults where the contact resistance at the fault point is greater than 1, the resistance can be reduced to less than 1 by increasing the voltage, and then measured by this method.

The cable fault tester adopts a box-type structure, adopts a touch screen for the operating system interface, all social function buttons are intuitively displayed on the screen, and user information can be directly related to the operation through the touch screen. With waveform storage management function, it can improve the storage of a large number of on-site safety test waveforms for observation and comparison on the same screen at any time. The design of the test interface is simple and clear, the definition of function buttons is simple and clear, and the measurement and research method is simple, convenient and fast.

The low-voltage pulse method detects the low resistance, short circuit, open circuit, and full length of the faulty cable, turns on the power switch and waits for the instrument to automatically enter the preset interface of the cable test system. Depending on the type and actual length of the faulty cable tested, click on "Cable Type", "Detection Method", "Length Selection", "Sampling Frequency", etc. in the analog key on the right side of the screen. Select Cable Type:

Depending on the type of cable you want to test, click the "Cable Type" analog key continuously. Observe the current status settings bar at the bottom of the screen until the cable type displayed matches the type of cable being tested. Click the "Detection Method" analog button, and the current status bar at the bottom of the screen shows a loop of "Low Voltage Pulse Method" and "High Voltage Flashover Method".

When the "Low Voltage Pulse Method" is selected, the "Pulse" green indicator on the instrument panel lights up, and when the "High Voltage Flashover Method" is selected, the "Pulse Flash" red indicator on the instrument panel lights up.

Click the "Length Selection": Analog button, and the current status setting bar at the bottom of the screen will cycle through "1km, 3km, 3k m". After the parameters are set (select the "low-voltage pulse method"), the red and black clips of the instrument system test line can be connected to the fault phase of the tested fault cable and another good phase or cable on the ground, click the "sampling" button, and the instrument and equipment will automatically start to enter a data information acquisition technical state, and the waveform will be studied and displayed on the screen at the same time.

By clicking the "Sampling" button again, the instrument enters the "Continuous" sampling time state. The operator can continuously adjust the "position with adjustment" and "amplitude adjustment" knobs according to the waveform change amplitude and position relationship displayed on the screen. Adjust the waveform to make it easier for students to analyze so far, and then click the "Cancel Sampling" touch key to stop sampling.

In data processing, the waveform can be widened, compressed, and moved left and right according to the specific conditions of the waveform, and then the double electronic cursor can be slid to read the fault distance. Save the operation steps: Click the "Save" button, a secondary menu will appear on the screen, save the waveform, and the test is completed.

The cable fault tester is mainly a high-voltage flush penalty and high-voltage flashover method, which are carried out according to the actual situation of the cable when we test.

Respondent: Huatian Power.

Dear, hello, the use of cable fault detection instruments is as follows: 1Place the cable fault detection instrument on the ground where the void is stable.

2.Connect the cable fault detection instrument to the power cable to be inspected using the wires provided by the instrument. 3.

Open the cable fault detection instrument and select the relevant detection parameter settings. 4.Begin testing the cables.

At this point, the instrument sends a high-voltage pulse signal and processes the received reflected waves to detect faults in the cable. 5.When the instrument detects a fault point, it displays the distance of the fault point and the fault type.

6.According to the distance displayed at the fault point, the location of the fault in the cable can be determined so that it can be repaired. 7.

After the cable is repaired, the cable fault detector is used again to ensure that the fault has been completely resolved.