Medium voltage power transmission line alternative
The invention is an electrical power system for powering quasi-remote loads wherein local electric utility power is stepped up in voltage and transmitted to a remote battery bank via a low cost, two-conductor, direct burial cable. The system is configured such that current in is this cable is relatively low and constant. The battery bank is used to buffer the low power feed from the electric utility source and the high power, high crest factor remote loads. An inverter, like the type used with off-grid solar power systems, converts the DC battery power to AC power to supply the remote loads.
1. An electrical power system for powering remote loads comprising; an AC power source coupled to a step-up transformer coupled to a power transmission cable coupled to a step-down transformer coupled to a rectifier coupled to a DC charge controller coupled to a battery coupled to a DC-to-AC power converter wherein;
AC power is transferred from the AC power source to a lower voltage winding of the step-up transformer and wherein;
AC power is transferred from a higher voltage winding of the step-up transformer to the power transmission cable and wherein;
AC power is transferred from the power transmission cable to a higher voltage winding of the step-down transformer and wherein;
AC power is transferred from a lower voltage winding of the step-down transformer to the rectifier and wherein;
DC power is transferred from the rectifier to the DC charge controller and wherein;
DC power is transferred from the DC charge controller to the battery and wherein;
DC power is transferred from the battery to the DC-to-AC power converter wherein;
AC power is transferred from DC-to-AC power converter to an AC load.
2. An electrical power system for powering remote loads according to claim 1 and further comprising; a ground fault interrupt device and an integrated AC-to-DC charge controller wherein;
the ground fault interrupt device is coupled between said step-up transformer and said power transmission cable and wherein;
AC power is transferred from the step-up transformer higher voltage winding to the ground fault interrupt device and wherein;
AC power from the ground fault device is transferred to the power transmission cable and wherein;
the integrated AC-to-DC charge controller is substituted for the series combination of both said rectifier and said DC charge controller.
3. The electrical power system for powering remote loads according to claim 2 wherein said integrated AC-to-DC charge controller is a power factor corrected type.
4. An electrical power system for powering remote loads according to claim 1 further comprising; a solar photovoltaic source coupled to a second charge controller coupled to said battery wherein;
DC power is transferred from the solar photovoltaic array to the second charge controller and wherein;
DC power from the second charge controller is transferred to the battery.
5. An electrical power system for powering remote loads according to claim 2 wherein said ground fault interrupt device interrupts system power between the AC power source and the step-up transformer.
6. An electrical power system for powering remote loads according to claim 4 further comprising a system controller.
7. An electrical power system for powering remote loads according to claim 1 wherein said power transmission cable is a direct burial type.
8. The electrical power system for powering remote loads according to claim 1 packaged as a plug-and-play or pre-engineered product.
9. The electrical power system for powering remote loads according to claim 2 packaged as a plug-and-play or pre-engineered product.
10. The electrical power system for powering remote loads according to claim 3 packaged as a plug-and-play or pre-engineered product.
11. The electrical power system for powering remote loads according to claim 4 packaged as a plug-and-play or pre-engineered product.
12. The electrical power system for powering remote loads according to claim 5 packaged as a plug-and-play or pre-engineered product.