Citadel 2.0 - Instruction Manual - page:
123
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21
As-found insulation and contact resistance tests;
As-found tests verify the integrity of the circuit breaker insulation system. An insulation
resistance test (colloquially known as a Megger*) and contact resistance test should be
conducted on equipment prior to installation to provide a base line for future comparison.
Over time detecting changes in these values provided clear indication of diminished
strength of the insulation system. A permanent record of periodic as-found tests enables
the maintenance organization to determine when corrective actions are required by
watching for significant deterioration in insulation resistance, or increases in contact
resistance.
* Megger is a Brand name registered trademark
.
Insulation and contact-resistance test equipment;
In addition to the high-potential test equipment capable of test voltages as listed in
Table 19 (page 124), the following equipment is also required:
An insulation resistence tester with variable test voltages of, 1,500 to 5,000 volts. 100 or 200
Amp filtered output continuous current micro-ohm.
Equipment
maximum voltage
rating kV
Equipment rated
power-frequency
withstand kV (rms)
Maximum ac rms
test voltage kV
Maximum dc
average test voltage
4.76
19
14
20
8.25
36
27
38
15.0
36
27
38
15.5
50
38
53
TABLE 18
The use of unauthorized parts in the repair of the equipment, or
tampering by unqualified personnel can result in hazardous conditions,
that can result in death, serious injury or property damage.
The use of unauthorized parts in the repair of the equipment, or
tampering by unqualified personnel will void all warranties.
Follow all safety instructions contained herein.
WARNING
WARNING
M A I N T E N A N C E
