10kV cable fault detection method

In this regard, it is necessary to have professional instruments, only in this way can a good effect be achieved, and relatively speaking, there is no problem to achieve a good effect.

Cable faults can be detected with specialized instruments.

I think this kind of computer failure perspective is still a normal suite mode, and you don't need to take this kind of computer failure.

The method of 10,000 volt cable fault detection generally has special instruments to detect, and we ordinary people have no way to detect.

This detection method can cause a malfunction of the computer.

For detection methods, you can find a professional to help you detect.

Fault detection and analysis methods for power cables? Hello! Glad to answer for you :

1。Bridge method and low-voltage pulse reflection method This method used to be an important method for fault detection of power cables. The advantage of these two detection methods is that they are more accurate in detecting faults in low-impedance lines, but they are not suitable for high-impedance circuits.

When some technicians use these two methods to detect high-impedance faults, they burn through the insulation by increasing the current to achieve the purpose of reducing the line resistance. The disadvantage of this is that it can also adversely affect the intact parts of the power cables. Therefore, in order to solve the high-resistance fault of the cable line, the technicians proposed the high-voltage current flash measurement method, and it has been widely used in the actual detection, but this method needs the experience of the technicians to assist, and reducing the error has always been the key point of the technological innovation of this method.

2。The principle of the secondary pulse method is to emit an impulse pulse in the faulty cable route and generate an arc at the fault through a low-voltage pulse and a high-voltage generator. At the moment of arcing, a low-voltage pulse is emitted inside the instrument, and when this pulse reaches the fault of the cable, it will cause a short circuit, and the reflected wave generated by the short circuit will be remembered in the instrument.

After the arc, a low-voltage measurement pulse is emitted, which passes through the fault point to the end of the cable and induces an open-circuit reflection. After z, the waveforms of the above two low-voltage pulses can be compared to accurately determine the location of the fault point. The cable fault detector will automatically match according to the above principle, and then judge and calculate the distance of the fault point.

The application of the quadratic pulse method in the field of cable fault detection makes the judgment of high-impedance faults as simple as that of low-impedance faults, so it has been widely used. 3。Power cable fault detection based on the principle of zero sequence DC The basic principle of this fault detection method is that when the power grid is working normally, the value of the zero sequence DC of each branch line is very small, generally not exceeding, if the single-phase loss and grounding fault occurs in the operation of the electric state, the zero sequence DC in the branch line will increase rapidly, generally up to about 50mA.

Therefore, the rapid increase of zero-sequence DC can be used as an important judgment index for cable line grounding fault. Based on the above principle, we can monitor the size of the zero-sequence DC in the outgoing line of each branch of the cable line, and once the power grid fails, the fault branch can be locked in order, and then the fault point can be accurately located by using the secondary pulse method mentioned in the previous section, and the fault can be quickly eliminated. Second, the prevention of power cable failure power cable is an important part of the urban power grid, and its complete operation has important significance for the normal operation of the power grid.

Therefore, power grid management and maintenance personnel should not only be able to quickly locate and eliminate faults, but also actively prevent power cable failures, and their specific measures include the following points: 1. Strengthen the anti-external loss work of power cables.

From the analysis in the first section, it can be seen that more than half of the power cable faults are caused by mechanical external force damage. Therefore, it is necessary to increase the inspection efforts to reduce the probability of external loss of power cables to the lowest level. Specifically, the power company should develop and improve the underground pipeline.