Electrical erosion test and condition assessment of SF ₆ CB contact sets

Online Assessment of Contact Erosion in High Voltage Gas Circuit Breakers Based on Different Physical Quantities

“…In the first category, the methods are based on measuring some parameters to recognize the present state and the degree of contacts degradation. Vibration analysis based on measuring the acoustic emission [10,11], and measuring the static and dynamic contact resistance [12][13][14][15] are considered in the first category. In the second category, the remaining lifetime is determined by considering the accumulated stress imposed to the interruption chamber components.…”

Method to improve the repeatability of dynamic contact resistance measurement test results for high‐voltage circuit breakers

“…R p and R a are used to evaluate the degree of contact erosion [6][7][8]11]. And R a also affects the capacity of the current commutation in SF 6 circuit breakers [12].…”

“…Previously published test results indicated that performing DRM tests at high DC injected current benefited the decrease of the resistance, the reduction of the oscillation in the resistance curves, the determination of the contacts separation moment, and the improvement of the repeatability of the DRM test results. However, the amplitude thresholds of I d in different references were different, such as 200 A [19,20], 700 A [9,21,22], 1000 A [6,11]. And they were determined by analysing the DRM test results at various amplitudes of I d .…”

Prediction of the dynamic contact resistance of circuit breaker based on the kernel partial least squares

“…The method has been widely used for many years because it does not need to dismantle the arc extinguish chamber [5][6][7][8]. Five essential diagnostic parameters were extracted from the contact resistance curves as a function of contact travel to build an effective condition assessment method for contact sets [9].…”