Showing posts from June, 2015

Motor and Pump Application Formula Save Energy and Make You Smart Designer

How Motor and Pump Application Formula can Save Energy and Make You Smart Designer? Motor and Pump applications simple formula can save energy by helping effective design for using maximum efficiency of your equipment. 

Some times we ignore these basic design formula and use larger size of equipment using thump-role formula which cases extra money energy as wastage. 

A gerotor (image does not show intake or exhaust) (Photo credit: Wikipedia)If we love ourself to be a energy saver or go to as green environment; we should take care of every bit of energy uses. Following motor and pump applications formula can help us to effective use of energy.
Centrifugal Applications
AFFINITY LAWSThe Affinity Laws of centrifugal pumps or fans indicates the influence on volume capacity, head (pressure) and/or power consumption of a pump or fan due to change in speed of wheel - revolutions per minute (rpm)geometrically similarity - change in impeller diameter Following three affinity formulas are related with …

Underground Power Cable Site Test after Installation

Underground Power Cable  Site Test after Installation:

Site test after installation underground power cable is required to confirm that the cable are installed properly and there is no any damage during laying.

Following site test should carry out for underground cable after installation:

1.Phase Checking Test 2.10 kV Sheath Integrity Test 3.Insulation Resistance Test 4.DC High Voltage Test 5.No load Test

For safe and effective energization of underground cable power line  site test after installation is necessary.

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Continuous Current Ratings of XLPE Insulated Underground Power Cable

Continuous Current Ratings of  XLPEInsulated UndergroundPower Cable:
Continuous current ratings or continuous current carrying capacity of XLPE (Crossed Poly Ethylene) insulated underground power cable is not same all the time. Current carrying capacity of cable depends on cable laying conditions and its ambient temperature. The major considerable conditions for current carrying capacity of underground power cables are as-
Ground Temperature of cable vicinity; Depth of cable laying ; Soil Thermal Resistivity; Cable Ambient Temperature; Maximum Conductor Temperature; Cable Formation; System Frequency; Load Factor, etc.

Cable Construction:
Cable construction may be various types depending on voltage ratings, conductor size and type, sheath type etc. Here we tried to show continuous current carrying capacity varies due to cable laying in direct buried, in pipe duct and trefoil  & flat position in air  for aluminium sheath, Lead sheath or copper wire shield XLPE insulated PE or PVC outer sheath …


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