## 3 New Concept for Assessing the Technical Condition of HV Switching Bay Devices
### A New Concept for Calculating the Technical Condition of a Circuit Breaker
#### 3.2.2 Additive Criteria for Calculating the Technical Condition of a Circuit Breaker
The weight of this criterion is the highest at \(w_{5}\) = 8, indicating that age will have the most significant relative influence on the final grade of the additive criterion for the CB condition, as undetected DIDs are included in the aging process. Criterion \(CR_{6}\) considers the influence of the short-circuit (SC) current during switching operations on the system unit to which the CB belongs in the overall assessment of the BC's condition. If the system unit is an overhead line unit, the number of such events can be represented by the number of automatic reconnections. The input data for this criterion are the total number of these events in the previous year. The criterion is divided into three categories. An increase in the number of these events can deteriorate the condition of the HV chamber significantly. This partial assessment thus monitors data on the condition of the HV chamber. These switching operations are included in the CB's total quota of switching operations. Successful and unsuccessful automatic reconnections relative to the phase are counted in the number of switching operations. The weight of this criterion is medium, at \(w_{6}\) = 4. Criterion \(CR_{7}\) depends on the number of switching manipulations performed under normal operating conditions during the last year under consideration. This criterion is related to the switching manipulations of the CB during planned events, and is divided into three categories. The evaluation of this criterion is associated with the condition of the HV chamber. According to the standard [27], a CB's switching manipulations can reach up  
\begin{table}
\begin{tabular}{c l l l l l l l l l l} \hline \hline
to 1000 during its service lifetime (the manufacturer provides the actual number). However, this number also has a specific influence on the condition of the HV chamber. The weight of this criterion is low at \(w_{7}=2\). Criterion \(CR_{8}\) is related to the number of switching manipulations of the circuit breaker during tests, measurements, and protection testing in a de-energized state. The number of these switching manipulations in the past year can be obtained indirectly via the status of the switching manipulation counter, from which the input data for criteria \(CR_{6}\) and \(CR_{7}\) are subtracted. This criterion (\(CR_{8}\)) is divided into three categories, as shown in Table 4. The partial grade for this criterion is related to the condition of the CB drive. The weight of this criterion is low, with an agreed weight of \(w_{8}=2\). Criterion \(CR_{9}\) is also related to planning remedial actions for deficiencies and internal defects. By assessing this criterion, the overall grade of the CB's condition can be reduced slightly. Each circuit breaker manufacturer has a predefined category for this criterion and the associated assessment. The weight of this criterion is medium, at \(w_{9}=4\). The grade of this criterion is determined, and it aligns with expert judgment. Manual entry is possible; however, this study demonstrates the automated calculation procedure below.