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Safer and Faster Testing with DualGround™ Technology
DualGround™ is Megger's groundbreaking technology that enables a safer and faster workflow because both sides of the circuit breaker remain grounded throughout the test.
How does it work?
The circuit breaker acts as variable capacitor when it operates. Its capacitance can be expressed as follows:
C is capacitance
ε is the dielectric constant
A is the surface area of the breaker contacts
d is the distance between the surfaces of the contacts
When the circuit breaker moves from being open to closed, d decreases and as a result, C increases. However, once the circuit breaker is fully closed, C drops to 0.
The DCM technique uses high frequency to achieve resonance in the test circuit. The resonance frequency varies when the circuit breaker changes state, and this is how a change from open to closed (and vice versa) is detected. This also means that the technique is completely immune to the effects of 50 or 60 Hz interference.
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I'm very happy with the device...brilliant build quality and just the right features for my application
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