ILM-FAN VA INNOVATSIYA
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CALCULATION OF ELECTRICITY LOSSES IN 6/10 KV OVERHEAD AND CABLE
POWER TRANSMISSION LINES
A.J. Isakov
F.E. Khojaev
https://doi.org/10.5281/zenodo.14511885
With the growing demand for electricity in rural areas worldwide, improving the
efficiency of energy supply and reducing network losses remain critical challenges. These
issues are particularly significant for developing countries. Identifying and minimizing energy
losses in power networks directly contribute to improving energy efficiency.
The total annual electricity losses in overhead power transmission lines are determined
as follows:
∆𝑊
ҳл
=
𝑃
ҳл
2
+𝑄
ҳл
2
10
3
∙𝑈
ҳл
2
∙ 𝑟
𝑜
∙ 𝐿
ҳл
+ ∆𝑃
салт.ўз
∙ 𝐿
ҳл
∙ Т
(1)
here:
𝐿
ҳл
- Length of the overhead lines;
𝑟
𝑜
- Specific active resistance of the overhead lines;
𝑃
ҳл
𝑎𝑛𝑑 𝑄
ҳл
, Т
– Active and reactive power flowing during the time interval. The time
interval for calculations is assumed to be 0.5 hours.
𝑈
ҳл
– Average voltage of the network
𝑃
сол.из
−
Power losses in insulators, determined by the following formula:
∆𝑃
𝑐ол.из
=
1000∙𝑃
𝑜
365∙24
(2)
here:
𝑃
𝑜
– For a 6 kV line, it is assumed as 0.011 kW/km, representing the power losses
per unit length of the insulator.
The electricity loss in cable lines is determined using the following formula:
∆𝑊
А
= 3К
э
∙ 𝑅
Σ
𝑡(𝐼
мин
2
+ (𝐼
макс
2
− 𝐼
мин
2
)𝛽) ∙ 10
−3
(3)
here,
𝑅
Σ
– Active resistance of the power transmission line;
К
э
– Equivalent resistance coefficient of the distribution network, determined based on
the graph in Figure 3;
𝑡
- Calculation period (excluding the line outage time), in hours;
𝐼
мин
and
𝐼
макс
- The minimum and maximum load values of the annual load graphs taken
for specific days, in amperes (A);
𝛽
– Shape coefficient.
By accurately calculating and analyzing power losses in overhead and cable power
transmission lines, the following results can be achieved:
Development of measures aimed at reducing electricity losses;
Ensuring balanced load distribution by optimizing load distribution across the lines;
Regularly inspecting insulators and network resistance to improve their technical
condition;
Analyzing load graphs to efficiently manage low and peak load points.
Thus, by applying methods for loss reduction and calculation techniques in power
networks, network efficiency is improved, energy savings are achieved, and economic
costs are significantly reduced.
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ILMIY-AMALIY KONFERENSIYASI
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Conclusion.
Reducing electricity losses in overhead and cable power transmission lines
is a crucial step toward enhancing the efficiency and reliability of power networks. Accurate
loss calculations and effective management strategies allow for significant improvements in
energy systems.
First, optimizing load distribution and reducing losses ensure better utilization of
energy resources, contributing to improved energy efficiency. Second, regular inspection and
maintenance of insulators and network resistances enhance the reliability of the power
supply system by improving its technical condition.
Moreover, decreasing electricity losses leads to significant economic savings, reducing
energy production and distribution costs. These efforts also support sustainable development,
particularly in rural areas, by ensuring a stable power supply that fosters economic growth
and improves the quality of life.
In conclusion, systematic analysis, the application of advanced loss reduction strategies,
and the adoption of innovative technologies are essential for creating a sustainable, efficient,
and cost-effective power transmission system.
