TDR9000
™
Circuit Breaker Test System User’s Guide
72A-1898 Rev. A 11/01 3-19
Monday, November 26, 2001 1:09 pm
EHV
The EHV module measures the main and resistor switch contact
operation timing when a Live Tank circuit breaker opens or closes. An
option is available (Doble P/N TR9320) that measures the Ohmic value
of pre-insertion resistors.
The TRXField software supports two configuration choices for the
contacts as a group:
EHV Measures two breaks per phase on all three phases.
Split Tests circuit breakers with odd numbers of
interrupters per phase, or activates and tests one
channel at a time in a module.
The EHV module, if used, can reside in Locations 2 through 5.
Figure 3.15 on page 3-20 maps the relationship between those
parameters set only on the Test Plan tab and the Virtual Front Panel
connectors they effect.
Another option is available that measures the capacitance of grading
capacitor assemblies installed in parallel with the circuit breaker
contacts.
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