again, and after a short interval, recloses the system for the second time. If the fault has not cleared on the third time, the system will open and stay open. The recloser also has a manual lever or electronic control to set the recloser on what is commonly referred to as "single- shot" action. When linemen are working in the general area of a circuit, they place the recloser in the single- shot mode. Then should a mistake be made, causing the circuit to trip, it will not reset itself automatically.
The equipment most commonly used for construction and maintenance of Navy power distribution systems consists of the utility truck, aerial bucket truck, earth auger, pole trailer, wire trailer, and various manual lifting devices.
The utility truck is a specially designed piece of equipment that, used effectively, provides the lineman with transportation, tool and material storage, and the capability to accomplish most tasks safely, efficiently, and quickly.
Figure 4-38. - Internal and external components of an oil circuit breaker.
The aerial bucket truck comes in various shapes and sizes. It is used at most naval installations or battalions for maintenance or construction of the power distribution system. The aerial bucket truck provides the power lineman with an efficient, comfortable, and safe working platform and is especially useful in areas where concrete or steel poles are used.
The aerial bucket truck has storage bins for material and tools. Depending on the make of the vehicle and the desired use, the truck may have a telescoping single- or double-arm boom, it may be equipped with hydraulic outrigger jacks for stability, and the bucket may be powered by the truck engine or an auxiliary engine mounted on the back of the truck. Because of the various designs of bucket trucks, each one will have some capabilities that are not common to all. When using an aerial bucket truck, you should follow the manufacturers operation, maintenance, and testing procedures at all times. This promotes smoothContinue Reading