This manual establishes the criteria for design, coordination, and construction of power systems for military projects. A secondary purpose is to acquaint designers with the general applications, philosophies, and purposes for the selection, calibration, setting, and testing of protective devices.
This manual describes protection techniques for electrical power supply and distribution systems. Guidance is included for coordination techniques and selection of protective devices.
Electrical power systems
Electric power systems consist of 4 major categories:
- Generating stations,
- Transmission lines,
- Distribution lines, and
- Utilization systems.
The electric power system industry converts and transports energy for utilization by numerous industrial, commercial, and residential customers. One of the largest users of electric energy in the United States is the U.S. Government.
The majority of electrical power produced in the United States is generated by steam-turbine plants. Hydro-electric generation accounts for only a small percentage because most available water sources have already been placed into service.
The voltage rating of large generators employed at primary generating stations ranges from 13.8kV to 24kV. Generator voltage is stepped up to transmission voltage level using transformers. Transmission voltage levels in the United States range from 115kV to 765kV.
Electrical power systems must be designed to serve a variety of loads safely and reliably. Effective control of short circuit current, or fault current as it is commonly called, is a major consideration when designing coordinated power system protection.
|Title:||Coordinated Power Systems Protection|
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