In-depth Analysis of the Causes of Medium-Voltage Cable Failure

There are often ZMS mv cable failure accidents in daily life, but in the final analysis, there are only a few reasons for mv cable failure.

They are mechanical damage, the bending radius exceeds the design standard, the current capacity is too large, and the tension is too large. Regardless of any failure, you can find a solution to the problem among these four reasons.

Let's introduce it in detail below

1 mechanical damage

External performance: tearing of the outer sheath of the mv cable, fracturing

Indirect performance: the internal insulation part or even the whole is damaged.

Analysis of the causes of mechanical damage: construction collapse, being touched by sharp stones, overloading of the winch

2 The bending radius exceeds the design standard

When the mv cable is bent, if the bending is too large and exceeds the design standard, it will cause mechanical damage to the internal components. And this will make the internal insulation of the cable more susceptible to loss.

The reason for this phenomenon: the placement method and wiring technology are not professional enough

3 Excessive current-carrying capacity: The rated temperature of the mv cable insulation layer is 90 degrees. Heat will be generated during the operation of the mv cable, and this heat will gradually increase with the current carrying capacity and the continuous running time of the cable. Therefore, the excessive current-carrying capacity of the mv cable will cause the temperature of the mv cable to rise continuously and eventually lead to a short circuit in the circuit.