Advantages and disadvantages of 10 kV overhead cables

Overhead cable over-voltage protection digestion and absorption of Japan, Australia, limiting the use of the working principle of the extinction angle, the first in China successfully developed technology for lightning protection measures for national conditions, to fill the lightning overhead wires to prevent disconnection and tripping new technologies and Blank new measures.

It is limiting the non-linear resistance element (zinc oxide valve) series consisting of the discharge gap installed on the line insulator. Its protection principle is: When a lightning overvoltage or other cause of the malfunction caused Advantages and disadvantages of 10 kV overhead cablesflashover formed on a metallic arc discharge short circuit, over-voltage protection circuit in a specially designed stainless steel drainage ring KA-level frequency can be led directly to the freewheeling Zinc oxide varistor limiting element, and by means of the nonlinear characteristics of the zinc oxide resistance-frequency sine-wave-shaped spire freewheeling turned into waves. 

Steeple wave current zero-crossing before there is quite a long time the current amplitude is small while limiting the residual voltage element cut discharge voltage, and to achieve rapid extinction of the arc cut off frequency freewheeling, to effectively prevent the overhead cable due Follow current and fusing temperature (lightning break) or trip purpose. Interrupter simple principle that it is through the insulator series gap drainage ring, zinc oxide varistor with a reasonable limiting element, in the role of lightning over-voltage through-flow for the release of lightning over-voltage energy, effectively limited lightning overvoltage.

Line over-voltage protection advantages and disadvantages.

Disadvantages

1. The investment is large.

2. Rod equipment.

3. The need to install a grounding device.

Benefits

1. Does not withstand the power frequency voltage, overhead cable loss is low, long life maintenance-free.

2. The effect of the series gap forming isolation to avoid dead single-phase ground fault, does not affect the safe operation of the line.

3. Easy to install, no need to replace insulators, nor do they need to change the original circuit design.

4. Its interrupter works by limiting elements quickly cutting off frequency freewheeling, effectively limiting the lightning over-voltage without tripping the circuit breaker arcing does not cause power interruption or affect power quality.

5. Do not need to break open the wire insulation, wire seals without solving water problems will not affect the mechanical tensile wire performance and service life.