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Tuesday, 6 May 2014
A Practical Guide to Earth Resistance Testing
Broadly speaking, “earth resistance” is the resistance of soil to the
passage of electric current. Actually, the earth is a relatively poor
conductor of electricity compared to normal conductors like copper
wire. But, if the area of a path for current is large enough, resistance
can be quite low and the earth can be a good conductor. It is the earth’s
abundance and availability that make it an indispensible component...
Control_of_active_power_&_frequency
§The frequency of a system is
dependent on active power balance
§As frequency is a common factor throughout the system, a change in active
power demand at one point is reflected throughout the system
§Because there are many
generators supplying power into the system, some means must be provided to
allocate change in demand to the generators
Fspeed governor on each generating unit provides primary speed
control function
Fsupplementary control...
PLC Complete Training For Beginners
This is a complete guide for beginners which are intrested in PLC. This .Rar file consists of PLC software, file containing different plc symbols, Different PLC problems with their solution. And also tell complete procedure of making a PLC
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PLC Beginner guide
This very easy and interesting book for those who are interested in PLC and want to learn PLC
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