## 1 Introduction  
Currently, the Korea Electric Power Corporation (KEPCO) checks the dips of the overhead wires, which are measured for the purpose of managing their safety. In KEPCO's distribution system design standards, it stipulates that a dip is calculated and managed as described in Table 1[1].  
In principle, after the criteria for allowable tension are derived through the above formula, it is necessary to check whether the allowable tension is exceeded to confirm the safety of the wires and cables, yet it is not easy to measure the tension in the actual field. This is because, in general, measurement of the tension of the overhead wires requires the installation of a specific tension measurement sensor. As already mentioned above,  
\begin{table}
\begin{tabular}{l} \hline \hline \multicolumn{1}{c}{**Fundamentals of Calculation for Dip**} \\ \hline The tension of the wires shall be set so that the wire tension (estimated maximum tension) when the worst condition is expected to be applied to the wire under the prescribed applied wind load is less than the allowable maximum tension of the wire. This calculation is based on the following equation: \\ \(T_{1}=\frac{T}{T}\) \\ \(T_{1}\): allowable tension (kg); \\ \(T\): tensile load on the wire (kg); \\ \(F\): safety margin \\ \(Here,\) the allowable tension of the wire when the safety margin is set to the minimum (\(F_{min}\)) is called the allowable maximum tension. \\ \end{tabular}
\end{table}
Table 1: Fundamentals of calculation for dip (KEPCO).  
installation of such a sensor is necessary to dismantle the existing parts such as wires and re-install it. Nevertheless, the facts that the asset management paradigm is changing from one-time consumption to efficient asset management and the overhead wires can actually be failed due to fatigue damage accumulation suggests the necessity for the tension measurement.  
Nevertheless, there is no suitable way to estimate the tension of the overhead wire except for the use of a tension sensor. Accordingly, in the field, the subjective judgment of the person in charge determines whether there is an abnormality in the tension of the overhead wire. This research proposed a method to estimate the tension of an overhead wire using an acceleration sensor that is easy to install additionally on the overhead wire, unlike the tension sensor. Obviously, there are many studies or approaches to solve various problems in the field using acceleration sensors, but research conducted focusing on the aspect of tension of the overhead wire is extremely limited, and most of the studies estimate tension of cables applied to bridges, not power facilities. This study differs from previous studies as an acceleration sensor was used for the method to estimate the tension of an overhead wire whose tension was continuously fluctuated by wind, among other factors.  
The composition of this paper is as follows: the reviews of related studies are described in Section 2, and Section 3 describes a method of estimating the tension of an overhead wire using the proposed mechanism. Section 4 describes the verification of the proposed method, and Section 5 describes the conclusions.