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1-5.DesignproceduresUtilityfeaturesshouldbedesignedconcurrentlywiththeplanningofthene...
1-5. Design procedures
Utility features should be designed concurrently with the planning of the new installation. The selection and design of the power supply and distribution systems will depend on the availability, capacity, and reliability of the existing and new systems.
a. Mission. The plant and its mission must be given priority in establishing coordination requirements, and in selecting features such as dual feeders, or back-up power generation. Where several designs are feasible, the selection will be based on an economic study.
b. New installations. Assistance from local electric utility companies and cooperatives may be sought during preliminary design, but no commitment should be made to obligate the Government
to procure electrical power or engage in contract negotiations. Contact with the local supplier should be limited to obtaining information on sources of electricity, their connection point location in regard to the site, conditions of service, utility capacity, and protective device ratings and settings. The electric supply and distribution systems should conform to prevailing practices of the utility service area insofar as they do not conflict with criteria in this manual.
c. Existing installations. Coordinate planning with the Directorate of Engineering and Housing, Base Civil Engineer, or official in charge to ensure that enough power will be available and that the design is compatible with the master plan for the installation. This may require anticipating what the master plan should be.
CHAPTER 2
ELECTRICAL POWER SYSTEM OVERCURRENTS
2-1.General
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. In order to fully understand the nature of fault current as it is applied to electrical power system design, it is necessary to make distinctions among the various types of current available, normal as well as abnormal. It is also important to differentiate between the paths which the various types of current will take. Both current type and current path, as well as current magnitude, will affect the selection and application of overcurrent protective devices.
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Utility features should be designed concurrently with the planning of the new installation. The selection and design of the power supply and distribution systems will depend on the availability, capacity, and reliability of the existing and new systems.
a. Mission. The plant and its mission must be given priority in establishing coordination requirements, and in selecting features such as dual feeders, or back-up power generation. Where several designs are feasible, the selection will be based on an economic study.
b. New installations. Assistance from local electric utility companies and cooperatives may be sought during preliminary design, but no commitment should be made to obligate the Government
to procure electrical power or engage in contract negotiations. Contact with the local supplier should be limited to obtaining information on sources of electricity, their connection point location in regard to the site, conditions of service, utility capacity, and protective device ratings and settings. The electric supply and distribution systems should conform to prevailing practices of the utility service area insofar as they do not conflict with criteria in this manual.
c. Existing installations. Coordinate planning with the Directorate of Engineering and Housing, Base Civil Engineer, or official in charge to ensure that enough power will be available and that the design is compatible with the master plan for the installation. This may require anticipating what the master plan should be.
CHAPTER 2
ELECTRICAL POWER SYSTEM OVERCURRENTS
2-1.General
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. In order to fully understand the nature of fault current as it is applied to electrical power system design, it is necessary to make distinctions among the various types of current available, normal as well as abnormal. It is also important to differentiate between the paths which the various types of current will take. Both current type and current path, as well as current magnitude, will affect the selection and application of overcurrent protective devices.
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哥们儿你这个给几分啊
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