Dr Kesorn Pechrach Weaver: Piezoelectrics in Circuit Breakers: How to Achieve Satisfactory Short circuit Performa...

Dr Kesorn Pechrach Weaver: Piezoelectrics in Circuit Breakers: How to Achieve Satisfactory Short circuit Performa...: Achieve Satisfactory Short circuitPerformance   Miniature circuit breakers (MCBs) are widely used for protection from electrica...

Dr Kesorn Pechrach Weaver: Piezoelectrics in Circuit Breakers: Piezoelectric Arc Movement

Dr Kesorn Pechrach Weaver: Piezoelectrics in Circuit Breakers: Piezoelectric Arc Movement: Cathode Root Movement In Figure 8.6, there is not a very large difference in the time of rapid arc motion despite significantly differe...

Piezoelectric Arc Movement

Cathode Root Movement

In Figure 8.6, there is not a very large
difference in the time of rapid arc motion
despite significantly different contact
velocities. In this case it is possible that the
delay is caused by the transfer of the arc
from the moving contact to the arc runner,
where factors such as gas flow have a strong
influence. The cathode root on the fixed
contact shows a more gradual movement for
both the piezoelectrically operated and
constant velocity contact systems. The
constant velocity system shows an initial
slowarc rootmovementof approximately 5
ms followed by rapid arc motion at the same
time as the anode.

Reference: Piezoelectrics in Circuit Breakers: Design & Test Paperback – 24 Dec 2014 by Dr Kesorn Pechrach Weaver PhD (Author)

Dr Kesorn Pechrach Weaver: Piezoelectrics in Circuit Breakers: How to use Piezoelectric in Circuit Breakers

Dr Kesorn Pechrach Weaver: Piezoelectrics in Circuit Breakers: How to use Piezoelectric in Circuit Breakers: Piezoelectric in Circuit Breakers It was found that adverse gas flow effects can impede the arc root motion, and that optimization of th...

How to use Piezoelectric in Circuit Breakers

Piezoelectric in Circuit
Breakers

It was found that adverse gas flow effects can impede the arc
root motion, and that optimization of the arc
chamber design could permit the use of
lower contact opening velocities. Recent
investigations [10] have shown that detailed
study of the arc-root phenomena can yield
improvements in arc chamber performance
thus permitting operation at reduced contact
opening velocity.

This now opens the possibility of refinement
of the mechanism using smart materials
actuation. Piezoelectric ceramic actuators
have been used as the trip element in
commercial circuit breakers [5] to provide
low power electronic actuation.

Reference:

Piezoelectrics in Circuit Breakers: Design and Test