How to detect whether a high voltage cable is live or not

Now suppose one of the cables is out of power. I want to find the one cable from the cable tunnel. On the load side, it should be known that there is a power outage.

Remove both ends of the cable in this way. Then a single-phase consumer is connected to the load side. It's better to have more power, so it's easier to confirm.

For example, it is connected to a single-phase load current of 20A. Then connect a phase of electricity on the power supply side, and then measure the cable current where it needs to be relocated. The cable has an electric current.

However, if the line is too long, it may not work. It is necessary to remove the two cables to form a circuit. It is these two cables that measure the current.

Because the current of other cables is basically zero.

At the two ends of the cable, that is, where there is a cable head, a high-voltage electric detector can be used to check the electricity, and in the middle of the cable, there is no way to directly check whether it is live.

You can use a small radio, when it can be recorded normally at a distance, when it is brought to the side of the cable, the noise becomes louder is the cable is live, and the cable is not charged if it does not change.

There is that kind of clamp-on induction voltmeter that should work.

Why dismantle a cable that you don't know from beginning to end? What happens when you let it sit there? Dismantling the cable must start from the power head of the cable, and the cable that does not know the power supply cannot be removed!

This situation is more complicated, so there is only a little bit of relocation along the circuit of the power outage cable from front to back.

High-voltage electric detector. Let's take it from the end of the head.

Brother uses a clamp ammeter, aren't you looking for death when you measure high voltage? Use a high-voltage electric detector to test ah, dismantling the cable must start from the power supply head of the cable, I don't know that the cable of the power supply can not be dismantled, and you have to eat a lawsuit when you die! Lives matter!

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Why don't you use special tools if you have special tools?

Use an electroscope. An electroscope is an instrument that detects whether an object is charged or not, and roughly estimates the amount of charge charged, as shown in the figure on the left. When the object to be inspected comes into contact with the conductor at the tip of the electroscope, its own charge is transferred to the foil inside the glass bell.

Since the same charge repels each other, the foil will automatically separate and be stretched at an angle.

According to the size of the two foils at an angle, the amount of charge charged by the object can be estimated. In fact, this is the electric field force on the foil, including the repulsion of the charge of the same name on the foil and the attraction of the charge of the same name on the inner wall of the vessel.

The electroscope can be transformed into a more accurate electrometer if the glass bottle is changed to a metal box to shield against static electricity, the metal rod and utensils are wired to measure the potential difference between two points, and the scale is added to quantify the results.

Summary. Generally speaking, detecting whether the high-voltage cable is live requires the use of some professional instruments and equipment, such as digital grounding resistance tester, partial discharge measuring instrument, etc. These devices are generally used by professional power maintenance personnel, who need to have certain skills and expertise.

Incorrect detection of live cables can lead to safety incidents such as electric shock or fire.

Generally speaking, detecting whether the high-voltage cable is live requires the use of some professional instruments and equipment, such as digital grounding resistance tester, partial discharge measuring instrument, etc. These devices are generally used by professional electrical maintenance personnel with rubber belts, which require a certain amount of technical and professional knowledge. Incorrect detection of live cables can lead to safety incidents such as electric shock or fire.

If you need to check whether the high-voltage cable is live, be sure to ask a professional power god maintenance personnel to operate. You should also ensure that all devices connected to the cable are switched off and plugged before testing, and do not perform the inspection yourself.

To detect whether the high-voltage cable has electricity, you can use a voltmeter or an electric pen to detect it. The specific steps are as follows:1

Use a multimeter or digital voltmeter to select the voltage measurement slip level and connect the probe to the test interface. 2.Place one probe on one end of the cable and the other on the other.

3.The measured value of the voltmeter is read, and the corresponding voltage value is displayed if the cable is electrified. If the voltage is 0, then there is no electricity to the cable.

4.If you are using a Nian La pen for testing, turn on the Hail Orange Pen and place the tip of the pen on the cable termination. If there is electricity in the cable, the pencil light will light up or make a sound.

It should be noted that the operation of detecting whether the high-voltage cable has electricity should be carried out by professionals to avoid the occurrence of safety accidents.

As an important part of the safe operation of power equipment, cable live detection has the following requirements: 1Safe.

In the process of live detection, the personal safety of the operator must be guaranteed, and at the same time, the operation must be strictly in accordance with the relevant operating procedures and safety operating procedures. 2.Accurate.

The cable live detection must accurately detect the actual parameters of the cable, such as voltage, resistance, insulation state, etc., to ensure the accuracy of the detection data. 3.Reliable.

Cable live detection must be inspected and verified by multiple methods and means to ensure the reliability of the test results and avoid equipment accidents caused by inaccuracies and errors. 4.Swift.

In the process of cable live detection, it is necessary to obtain the detection data as soon as possible, so as to find and solve the problems of the cable when the land is closed, and avoid accidents caused by slow action. 5.Science.

In the process of live detection of envy delay cable, it must be carried out in strict accordance with the testing procedures and scientific methods, and the operator must master the scientific testing knowledge and technology, and be proficient in the use of various testing equipment and technical methods. 6.Standard.

In the process of cable live detection, it is necessary to follow the relevant national and local testing standards, such as testing methods, testing indicators, etc., to ensure the standardization of testing data and standardized informatization. It is important to note that cable live detection is an operation involving the safety of high-voltage electricity and must be performed by trained and certified professionals. Operators must have a correct attitude, work seriously, and strictly follow the requirements of operating procedures and safety operating procedures to ensure testing.