14-08-2012, 04:30 PM
VIBRATION ISOLATORS
VIBRATION ISOLATORS.pptx (Size: 1.41 MB / Downloads: 39)
Vibration isolators are commonly used to mount the Genset to a concrete pad,
The purpose of vibration isolators is to reduce the noise and vibration which would be transmitted from the Genset to the foundation or supporting structure.
A simple and effective method of mounting and applying pad type isolators is place non−skidding type isolation pads directly between the sub−base and floor. The number of pads required is determined by the rating of the pads and the Gensets weight.
Steel spring isolators are a very effective and commonly used. Steel springisolators are typically 95−98% efficient (reduces the transmitted vibration 95−98%) while a pad type can be 75−88% efficient.
TRANSFER SWITCH
Locate transfer switch in a clean, dry place, near the emergency load.
Provide a circuit breaker between the Genset and the transfer switch.
Put a flexible connection between the conduit and Genset.
Observe applicable codes in wiring−in the transfer switch and Genset.
The transfer switch connects the Genset to the emergency power system. The emergency power system may include several Gensets and several transfer switches. Typically, the Genset is wired to the emergency power system through a transfer switch.
Battery Location
Locate batteries as close as possible to the Genset.
Mount batteries on a level rack away from dirt and liquids. Allow space for servicing (checking water level and level of charge). Baldor Gensets can be ordered with battery racks already installed.
Cold ambient temperature at the battery location substantially reduces the battery output.
Lightning Protection
Lightning strokes can be of two kinds. In the first, a charged cloud induces a charge of opposite sign in nearby tall objects, such as towers, chimneys and trees.
The electrostatic stress at the upper ends of these objects is sufficiently great to ionize the air in the immediate neighbourhood, which lowers the resistance of the path between the cloud and the object.
Ultimately, the resistance is lowered sufficiently for a disruptive discharge to occur between them. This type of discharge is characterized by the time taken to produce it, and by the fact that it usually strikes against the highest and most pointed object in the area.