Under normal conditions, elbow probes and bushing inserts should last as long as elbows. However, there are a few signs that indicate when the probe and/or bushing insert should be replaced.
All bolted deadends are rated 40% of the conductor RBS. Bolted deadends can be used in slack span applications where line tension is less than 5% of RBS.
As the CHANCE® Drivecast™ screw displacement pile is rotated into the ground, it compresses the soil laterally, creating a void which is immediately filled with grout maintained in the reservoir. The schedule 80 centralized shaft replaces the rebar cage as column reinforcement.
Recent updates to OSHA 1910.269(n) and 1926.962 have emphasized the responsibility of the employer to ensure their personal protective grounding equipment and practices are adequate to protect employees from hazardous differences in electrical potential. One important aspect that is often overlooked is the care and maintenance of the grounding equipment.
Topics: Lineman Grade Tools
Construction crews and installers face a significant investment financially and time-wise when working with Continuous Flight Auger piles. For installation alone, the process is tenfold.
Distribution lines are likely targets for lightning strikes. Once the lightning touches the line, the surge divides and travels both directions. The lightning surge will then probably cause an insulator to flash over. Why?
You’ll probably never see anyone trying to use an elbow-puller tool for anything except what its name implies. However, you are likely to find many who attempt pulling elbows with other tools, most commonly a shotgun stick.
Topics: Lineman Grade Tools
Communications assisted methods are unique in that they effectively eliminate the non-detection zones (NDZ) found in many local methods used for islanding detection. As a result, local protection elements may be set less sensitively, reducing false operations during system disturbances.
Expulsion fuse links are designed for circuit protection from over-current occurrences and developed to closely follow the time-current characteristics (TCC) of most over-current relays used in oil circuit breakers. Proper coordination schemes should maintain both transformer and circuit protection while limiting unnecessary outages.
Topics: Switching & Fusing
Power system islanding occurs when distributed generation becomes isolated from the power system grid and continues to provide power to the portion of the grid it remains connected to. Islanding can occur through the operation of switching devices such as breakers, disconnects or reclosers. Utilities can also experience islanding with system faults, switching operations, environmental causes and equipment failure. For example, a fault causing a recloser to open and lockout causes the generator to become islanded from the source station.