doble TDR9000, User Manual, Page: 227 / 454

TDR9000
™
Circuit Breaker Test System User’s Guide
72A-1898 Rev. A 11/01 A-27
Monday
, November 26, 2001 1:09 pm
Contact Penetration, Insertion, and Wipe
The main distinction between the contact penetration, sometimes
referred to as contact insertion, and the contact wipe is that the first is
obtained through mechanical measurement and the second through
electrical measurement.
The value of contact penetration is obtained as follows: with the circuit
breaker closed, a mark is made on the moving contact as shown in
Figure A.28.
Figure A.28 Contact Penetration Value Preparation
With the circuit breaker open, the distance between the mark and the top
of the moving contact is measured as shown in Figure A.29. This distance
is the value of contact penetration or contact insertion.
Figure A.29 Contact Penetration Measurement
Mark
Penetration
Mark