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

Dr Kesorn Pechrach Weaver: Piezoelectrics in Circuit Breakers: Arc Movement:   Arc Movement The observation that the arc movement occurs at the same contact gap for both contact systems is in accord with previ...

Arc Movement

 

Arc Movement

The observation that the arc movement
occurs at the same contact gap for both
contact systems is in accord with previous
studies [36] where it was shown that a
minimum contact gap is requirement for arc
motion. However, in this study the most
significant delay in moving away from the
contact region occurs after this initial arc
motion, and in these tests the onset of rapid
arc motion bore no relationship to the
contact separation.
The waveform of arc voltage and contact
position when the contact opening velocity
of 1 m/s, using solenoid and piezoelectric as
mechanism to open the contacts, as shown in
Figure 8.4.

Reference:

Piezoelectrics in Circuit Breakers: Design & Test

Dr Kesorn Pechrach Weaver: Piezoelectrics in Circuit Breakers: Arc Chamber Vent

Dr Kesorn Pechrach Weaver: Piezoelectrics in Circuit Breakers: Arc Chamber Vent: Arc Chamber Vent There are seven variable parameters used to investigate the effects on the mobility of the arc root from the contact r...

Arc Chamber Vent

Arc Chamber Vent

There are seven variable parameters used to
investigate the effects on the mobility of the
arc root from the contact region. They are
contact material, arc chamber vent, peak
short circuit current level, contact velocity,
arc chamber material, the gap behind the
moving contact and supply polarity.

Reference:

Ronsek 

Piezoelectrics in Circuit Breakers

Dr Kesorn Pechrach Weaver: Piezoelectrics in Circuit Breakers: Piezoelectric as contact mechanism

Dr Kesorn Pechrach Weaver: Piezoelectrics in Circuit Breakers: Piezoelectric as contact mechanism: Piezoelectric as contact mechanism The short circuit current experiment using piezoelectric as electrical contact in circuit breakers....

Dr Kesorn Pechrach Weaver: Piezoelectrics in Circuit Breakers: Piezoelectric as contact mechanism

Dr Kesorn Pechrach Weaver: Piezoelectrics in Circuit Breakers: Piezoelectric as contact mechanism: Piezoelectric as contact mechanism The short circuit current experiment using piezoelectric as electrical contact in circuit breakers....

Piezoelectric as contact mechanism

Piezoelectric as contact mechanism

The short circuit current experiment using piezoelectric as electrical contact in circuit breakers. 

Arc voltages for piezoelectric and constant velocity 1 m/s contact systems and Contact trajectories for the two systems.

Have a look in the figure, the results was clearly showed.


Reference:

Ronsek.com

Piezoelectrics in Circuit Breakers

Dr Kesorn Pechrach Weaver: Piezoelectrics in Circuit Breakers: Ronsek Trademark Intellectual property

Dr Kesorn Pechrach Weaver: Piezoelectrics in Circuit Breakers: Ronsek Trademark Intellectual property: Ronsek Trademark Intellectual property Ronsek Limited has register the trademark "RONSEK" in United Kingdom. The trademark...

Ronsek Trademark Intellectual property

Ronsek Trademark Intellectual property

Ronsek Limited has register the trademark "RONSEK" in United Kingdom. The trademark number: UK00003271539, on 18 November 2017.

Dr Kesorn Pechrach Weaver: Piezoelectrics in Circuit Breakers: Circuit Breaker Arc Chamber Cross Section

Dr Kesorn Pechrach Weaver: Piezoelectrics in Circuit Breakers: Circuit Breaker Arc Chamber Cross Section: Circuit Breaker Arc Chamber Cross Section A cross section of the arc chamber in the Flexible Test Apparatus (FTA) and the arc chamber ...

Circuit Breaker Arc Chamber Cross Section

Circuit Breaker Arc Chamber Cross Section

A cross section of the arc chamber in the
Flexible Test Apparatus (FTA) and the arc
chamber are shown

Reference:

Ronsek

 Piezoelectrics in Circuit Breakers

Dr Kesorn Pechrach Weaver: Piezoelectrics in Circuit Breakers: Piezoelectric Actuators

Dr Kesorn Pechrach Weaver: Piezoelectrics in Circuit Breakers: Piezoelectric Actuators: Piezoelectric Actuators The planar disposition of the two ceramic plates means that the high fields can be applied without danger of re...

Piezoelectric Actuators

Piezoelectric Actuators

The planar disposition of the two ceramic
plates means that the high fields can be
applied without danger of repolarising the
ceramic. This is different from a
conventional bimorph structure.

The first arm of the actuator produces a
downward movement which provides an
angle for the movement amplification of the
second arm. The total movement is slightly
less than could be obtained from a single
beam of twice the length.

Ref: Piezoelectrics in Circuit Breakers: Design & Test

Dr Kesorn Pechrach Weaver: Piezoelectrics in Circuit Breakers: Arc current at 5.5 m/s

Dr Kesorn Pechrach Weaver: Piezoelectrics in Circuit Breakers: Arc current at 5.5 m/s: Arc current at 5.5 m/s The total period of the arc for the contact opening velocity at 5.5 m/s is about 6000 μs. The peak of arc curr...

Arc current at 5.5 m/s

Arc current at 5.5 m/s

The total period of the arc for the contact
opening velocity at 5.5 m/s is about 6000 μs.
The peak of arc current is about 2400 A. This
is higher than the arc current at contact
opening velocity of 10 m/s.

Ref: Piezoelectrics in Circuit Breakers: Design & Test

Dr Kesorn Pechrach Weaver: Piezoelectrics in Circuit Breakers: Opportunity: direct electromechanical coupling of ...

Dr Kesorn Pechrach Weaver: Piezoelectrics in Circuit Breakers: Opportunity: direct electromechanical coupling of ...: Opportunity The direct electromechanical coupling of a piezoelectric actuator means that it would be possible to tailor the contact ope...

Opportunity: direct electromechanical coupling of a piezoelectric

Opportunity

The direct electromechanical coupling of a
piezoelectric actuator means that it would be
possible to tailor the contact opening
trajectory simply by controlling the charge
on the actuator. It is known that the opening
velocity profile can have a significant effect
on the contact erosion [36, 37], and it may
therefore be possible to optimize the contact
opening trajectory for minimum contact
erosion. This is an important area for further
study.
These initial results show that despite a low
contact opening velocity on the
piezoelectrically operated contacts (due to
the large mass of the moving contact) the
transition to rapid arc motion away from the
contact region occurs only slightly later than
the constant velocity system. Clearly the
contact mass is a significant factor in the
speed of operation of the contact system.

Ref: Piezoelectrics in Circuit Breakers: Design & Test

Dr Kesorn Pechrach Weaver: Piezoelectrics in Circuit Breakers: How to Measure the Arc Pressure

Dr Kesorn Pechrach Weaver: Piezoelectrics in Circuit Breakers: How to Measure the Arc Pressure: How to Measure the Arc Pressure Two pressure transducers are used to monitor the gas pressure in the arc chamber. The SX series of pie...

How to Measure the Arc Pressure

How to Measure the Arc Pressure

Two pressure transducers are used to
monitor the gas pressure in the arc chamber.
The SX series of piezo resistive pressure
sensor functions as a wheatstone bridge on a
silicon chip with a response times of 0.1 ms.
The pressure transducer gives a voltage output directly proportional to the applied
pressure with sensitivity 0.75 mV/Psi. Long
term stability is 0.1% and repeatability is
0.5% (Maximum difference in output at any
pressure with the operating pressure range
and temperature within O °C to +70 °C).
Resistors are ion implanted into the silicon.
The cavity etched on the reverse to create a
thin silicon diaphragm.

Reference: Piezoelectrics in Circuit Breakers: Design & Test 

Dr Kesorn Pechrach Weaver: Piezoelectrics in Circuit Breakers: How to use Solenoid and Piezoelectric in Circuit B...

Dr Kesorn Pechrach Weaver: Piezoelectrics in Circuit Breakers: How to use Solenoid and Piezoelectric in Circuit B...: Solenoid and Piezoelectric in Circuit Breakers The waveform of arc voltage and contact position when the contact opening velocity of 1 ...