A method for finding fault points of cables

A method for finding fault points of cables

In real life, we know that high voltage cable or low voltage cable in construction operation process often appear some fault, with the reason for this is mostly due to short circuit, overload operation of insulation aging or external force damage caused the occurrence of fault, such as this kind of situation often work for our lives will produce certain effect, in this case, we must find the point of failure in time, use the relevant wire and cable testing equipment to detect fault, do disposed in time, reduce the loss to low, today, Cable Detection Equipment Factory  will share with you about the cable fault point search method:

Cable fault point finding method:

(a) sound measurement method: according to the sound of the discharge of the fault cable for search.

Method introduction: this method is effective for flashover discharge of insulation layer by high voltage cable core wire. The wire and cable testing equipment used in this method is dc voltage testing machine. When searching, the pickup close to the ground, along the cable to move slowly, when heard 'AIDS, AIDS' discharge sound is large, the point is the fault point.

Precautions: use this method must pay attention to safety, in the wire and cable detection equipment terminal and cable terminal should be set up for monitoring.

(2) bridge method: the direct current resistance value of cable core wire is measured by double-arm bridge, and then the actual cable length is measured accurately. The fault point is calculated according to the direct proportional relationship between cable length and resistance.

Methods: the method for direct short circuit or short circuit point contact resistance between the cable core is less than 1 Ω fault, general judgment error is not more than 3 m, for failure of point contact resistance is greater than 1 Ω failure, can adopt the method of heightening voltage burn through resistance drop below 1 Ω, then measured by this method.

Note: the measurement accuracy should be guaranteed when using bridge method, the bridge connection line should be as short as possible, the diameter should be large enough, the connection with cable core wire should be pressed or welded, and all the small and medium digits should be retained in the calculation process.

(3) capacitive current measurement method

Method introduction: during the operation of cable, capacitance exists between the core wires and the core wires to the ground, which is evenly distributed, and capacitance has a linear proportional relationship with the cable length.

Can be seen from the above, give everyone finishing three cable fault point search method namely: sound method, bridge method, capacitance current measurement, the three detection methods have been tested at the certification, more methods for searching the cable fault point, yes we wire and cable test equipment manufacturers and provide related technical consultation and service! For the above three kinds of cable fault detection methods used in the cable detection equipment, we are available for sale, welcome your presence!

That's all for the sharing, thanks for your reading, and we also supply Adjustable Working current Cable Load Tester for sale, if you have any demand for our products, just feel free to contact us.