Analysis of a High Voltage Air Circuit Breaker and The Current-zero Phenomenon

This paper presents a new method to measure the current zero phenomena of a circuit breaker that is parallel connected to a switch. This method is ideal for applications where faster operation is required. The air circuit breaker is mainly used for systems with a voltage of 11 KV. The current measurements were carried out to obtain the V-A relationship between the current zero region of a model Air circuit breaker and the transient time of an arc resistance. The results of the investigations revealed that the time constant cannot be regarded as a constant in the equation. Zero current phenomena that occur when high currents are interrupted by an Air circuit breaker have also been studied. In order to measure the current and voltage in the current-zero region, high-resolution equipment has been used. Three examples of phenomena that have been observed are presented. One of these is the phenomenon that occurs when a current-measuring device senses that the current is zero for a brief period, but then continues to flow thereafter. The second and third examples show the zero phenomena after high-current currents, which are much higher than the rated short-circuit current. The latter two examples also show a low-voltage period following current-zero. In addition, the third example shows traces of current measurement. The first two examples show the current zero phenomena after high-circuit currents, while the third one shows a low-volt period following currentzero. In addition, the third example shows proof of current measurement. The plasma tends to conduct poorly before current-zero, but it performs well after. The zero-current model of the circuit breaker and the varying rows and models are verified with measurements.