9-1　Abstract

With the changes of the times, the living standards of the people are improving, and the customers are increasingly demanding the quality of the services provided by Taipower company. In order to effectively reduce the time of power outages and improve the reliability of power supply, the department of Distribution has reviewed and continued the following aspects:

9-2　Actual Action

9-2-1　The Planning and Design

　　Planning and designing the power distribution line system as a loop-type method, and adding switches to isolate and change power transmission way that reduce the scope of power outages when the construction or maintenance operations are proceeded in the future
　　Before designing a case, the designers consider the factors, such as the site environment and the conditions of the power distribution line equipment, to plan the optimal design to reduce the construction projects with power outage (e.g., live line operations or high-voltage parallel transfer operations).

9-2-2　The Construction

　　Before the construction of the project, we review the methods of the case and prioritize the work without power outages, and send personnel to survey the site in advance to check whether the information about the relevant equipment is correct or not that eliminates all factors that affect the construction, and plan a suitable work schedule to shorten working hours and reduce the area of impacted users.
　　Before arranging the power outages works, review and address the cases with the same power outage scopes and implement controlling them to reduce the number of power failure. In addition, according to the content of the case, properly plan the operation process and deploy appropriate constructers and equipment to complete within the planned time.

9-2-3　The Technique

　　Continue referring to the foreign construction technologies and improve various construction methods, and gradually promote non-blackout construction operations to reduce the time and the number of power outages works under the premise of ensuring safety at work.
　　The construction projects that have been implemented without power outages include “live line operations”, “high-voltage parallel transfer operations” and “temporary transformer operations”. The construction department can choose the appropriate operation way according to the content of the case and considering the site environment and system to reduce the time and number of power outages.

Figure 1. temporary transformer operations

9-2-4　The Distribution lines

Covering the overhead bare lines:
Since 1999, the overhead bare aluminum wires have been gradually replaced with cross-linked PE covered wires, and the equipment such as terminal cable clamps and wiring rings have been continuously developed to reduce the chance of overhead lines being touched by something and effectively prevent people from touching high-voltage lines.

Figure 2. Covered terminal cable clamps

Figure 3. Covered wiring rings

• Covering the line switches:

  The single-phase switches are all exposed, which easily lead to feeder tripping caused by something likes birds, beasts, trees, etc. Therefore, the three-phase connected dynamic load on-off switch has been developed to completely cover the charged parts.

Figure 4. single-phase switches (left one) and the three-phase connected dynamic load on-off switch (right one)

• Improved exposed weaknesses in overhead equipment:

  In order to reduce the damage of overhead lines caused by wind disasters and the contact of birds, animals and trees, etc., we gradually develop the equipment to improve the exposed parts of transformers and power fuses, and pursue the full-covered the power distribution lines in the future.

9-3　Conclusion

In summary, the improvement measures implemented by Taipower will effectively reduce power blackout time.