Appendix F
1.4 Wire impedance
| T/B | AI |
| ADAM 5000/485 |
|
|
| AO |
DC |
|
|
P/S | Grounding Bus | Copper mesh for Shielding |
E | ||
Tr |
| (should be grounded only on one end) |
|
|
Grounding Bus
Connect to ground bar on the factory.
EThe ground bar should have a resistance below 5 ohm.
Figure F-5 : The purpose of high voltage transmission
•What’s the purpose of high voltage transmission?
We can see the high voltage tower stand at suburban. The power plant raises the voltage while generating the power, then downs the voltage when transmits the power to power station. What’s the purpose of high voltage transmission do you think? According to the energy formula, P = V * I, so the current will be reduced while raising the voltage. Besides, as you know that each cable has the wire impedance. So, referring to Ohm rule (V = I * R), this decreased current makes the low power consumption. So the high voltage transmission just for reducing the power consumption.
Figure F-6 : Wire impedance
|
