
Grounding
4-10
72A-1898 Rev. A 11/01
Monday
, November 26, 2001 1:09 pm
Site Preparation
This section covers site preparation for the following tests:
• Dead Tank Circuit Breaker
• Live Tank Circuit Breaker
Preparation can be broken down into the following tasks:
1.
Circuit breaker preparation, including safety ground attachment,
which is common for Dead Tank and Live Tank tests
2.
Rotary/Linear Transducer installation, which varies for Dead and Live
Tank tests
3.
TDR9000 configuration, which is common for Dead Tank and Live
Tank tests
4.
Safety Grounds removal, which is common for Dead Tank and Live
Tank tests
Circuit Breaker Preparation
The TDR9000 is designed to test circuit breakers with one side of the
circuit breaker at ground potential at all times.
In addition to the circuit breaker itself, the Contact Monitor cables act as
excellent antennae for electrostatic or electromagnetic pickup. Since the
length of the cables and their relationship to the energized conductors is
a determining factor in the level of interference, the TDR9000 system
uses shielded Contact Monitor cables. This shielding minimizes the
length of the cable that is exposed to electrostatic or electromagnetic
pickup.
Although the system successfully performs in the presence of mild
electrostatic interference, every effort to minimize the interference
should be made.
Preparation of the circuit breaker includes:
1.
Opening the circuit breaker
2.
Opening, locking and tagging the circuit breaker isolating disconnect
switches
3.
Connecting safety grounds to a cleaned (brushed) spot on the ground
grid and then to each bushing of the circuit breaker to be tested
4.
Removing DC power from the Trip and Close circuits on the circuit
breaker control panel
Содержание TDR9000
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