The most direct cause of cable problems is the breakdown due to the loss of insulation. First of all, there are:
a. Overload operation. Long-term overload operation will increase the temperature of the cable, aging the insulation, resulting in breakdown of insulation and degradation of construction quality.
b. Electrical aspects: the construction technology of the cable head does not meet the requirements, the sealing of the cable head is poor, the moisture intrudes into the cable, and the insulation performance of the cable decreases; Failure to take protective measures when laying the cable, the protective layer is damaged and the insulation is reduced.
c. Civil engineering aspects: poor drainage of the well pipe trench, and the cable is soaked in water for a long time, which damages the dielectric strength; The well is too small, the cable bending radius is not good, and it is damaged by extrusion external force for a long time. First of all, the mechanical brutal construction in municipal construction, digging and digging cables.
d. Corrosion. The protective layer is subjected to chemical corrosion or cable corrosion for a long time, resulting in the failure of the protective layer and the loss of insulation.
e. The quality of the cable itself or the cable head accessories is poor, the cable head has poor sealing, the insulating glue is dissolved and cracked, which leads to the resonance phenomenon of the station for the line disconnection, so that the line interphase capacitance and ground capacitance and the distribution transformer excitation inductance form a resonance loop, and then provoke ferromagnetic resonance.
Resonance damage caused by wire breakage problems
In severe cases, the superposition of high frequency and fundamental frequency resonance can make the overvoltage amplitude reach 2.5 times of the phase voltage, which may lead to the displacement of the neutral point in the system, the overvoltage of the winding and the wire, and the insulation flashover, the arrester will burst, and the electrical equipment will be damaged when it is severe. In some cases, the load transformer phase sequence may be reversed, or the overvoltage may be transmitted to the low voltage side of the transformer, causing damage.
Measures to prevent wire breakage resonance overvoltage
The first measures to prevent resonant overvoltage at wire break are:
(1) Do not use fuses to prevent non-full-phase operation.
(2) Strengthen the inspection and maintenance of the line to prevent the occurrence of disconnection.
(3) Do not hang the no-load transformer on the line for a long time.
(4) Choose ring network or dual power supply.
(5) Attach phase-to-phase capacitors on the distribution side.
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