Impulse generators are designed to locate faults in power cable by the high voltage impulse method, in which a high-voltage impulse is transmitted down the cable to cause the fault to arc. The arcing fault is then pinpointed using an appropriate impulse detector. Megger impulse generators may also be used to perform voltage versus time acceptance tests, or to burn faults that fail to break down under impulse to reduce their resistance.
Heavy-Duty Model
This powerful unit, designed for van or substation use, offers the highest impulse rating in the industry. It delivers up 10,800 Joules at 30 kv.
APPLICATIONS
Megger impulse generators pinpoint faults on primary distribution cable rated from 3.3 to 35 kV, including directed buried cable and cable in conduit or duct.
For faults that do not break down in the impulse mode, a burn mode is provided to reduce the resistance so that those faults will break down under impulse voltage.
In addition to fault locating, these units can be used as proof testers to check the quality of insulation before and after cable repair.
FEATURES AND BENEFITS
Impulse generators offer specific benefits that ensure efficient, effective and safe fault locating.
Rugged Construction
Housed in sturdy metal cabinets using welded construction throughout to withstand the rigors of field operation.
Impulse switches use tungsten ohmic contacts for extended life.
Simple Operation
Modular control panels with a minimum of controls and instrumentation reduce operation complexity.
Single lever operation mode selector eliminates the need to disconnect and manually interchange high voltage output cables.
High voltage and return leads are combined in one coaxial cable eliminating the need to unravel the total length of test cable during operation.
Standard Safety Features
Isolated high voltage output cable
Zero-start voltage interlock
High voltage ON lamp
Automatic grounding upon shutdown
Redundant ground connections
Manual grounding of capacitor and cable by Mode Selector for safety.
Viewing window to confirm internal grounding system
Circuit breakers
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