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177 ADAM-5560 Series User Manual
Chapter B Grounding Reference
What’s the purpose of high voltage transmissions? We have all seen high voltage
transmission towers. The power plant raises the voltage while generating the power,
then a local power station steps down the voltage. What is the purpose of high volt-
age transmission wires ? According to the energy formula, P = V * I, the current is
reduced when the voltage is raised. As you know, each cable has impedance
because of the metal it is made of. Referring to Ohm’s Law, (V = I * R) this decreased
current means lower power losses in the wire. So, high voltage lines are for reducing
the cost of moving electrical power from one place to another.
Figure B.6 Wire Impedance
B.2.5 Single Point Grounding
Figure B.7 Single Point Grounding (1)
What’s Single Point Grounding? Maybe you have had an unpleasant experience
while taking a hot shower in Winter. Someone turns on a hot water faucet somewhere
else. You will be impressed with the cold water! The bottom diagram above shows an
example of how devices will influence each other with swift load change. For exam-
ple, normally we turn on all the four hydrants for testing. When you close the hydrant
3 and hydrant 4, the other two hydrants will get more flow. In other words, the hydrant
cannot keep a constant flow rate.