Anode and Cathode root in Circuit Breakers

Anode and Cathode root in Circuit Breakers

The anode and cathode root displacement are shown in Figure 4.21. The results show
that when the pressure starts to rise up, both anode and cathode root still stay in the
contact region. At the period of 1800 μs, the second pressure rises up.
This is coincident with the point that the cathode root moves off from the fixed
contact. When the anode root moves from the contact region at the period of 2600 μs,
the pressure drops down shapely.
At contact opening velocity of 10 m/s (see Figure 4.16), the pressure rises earlier than
that of 1 m/s. The maximum pressure when the contact opening velocity of 1 m/s is
double that of 10 m/s. The arc root contact time at contact opening velocity of 1 m/s
is longer than that of 10 m/s. The period the arc root is in the arc chamber at contact
opening velocity of 1 m/s is shorter than that of 10 m/s.

Reference:

Arc Control in Circuit Breakers: Low Contact Velocity Paperback – 1 Jan 2017 by Dr Kesorn Pechrach PhD (Author)