GR 2957 CORE : ISSUE 1

1. Introduction
    1.1 Purpose and Scope
    1.2 Structure and Use of This Document
    1.3 Requirements Terminology
    1.4 Requirement Labeling Conventions
          1.4.1 Numbering of Requirement and Related Objects
          1.4.2 Requirement, Conditional Requirement, and
                  Objective Object Identification
    1.5 Referenced Requirements
    1.6 FESS Nomenclature
2. Design Considerations
    2.1 Powering Architectures
    2.2 FESS Power Processing Alternatives
    2.3 Monitoring
3. General Functional and Performance Requirements
    3.1 General Safety
          3.1.1 Code Compliance
          3.1.2 Grounding
          3.1.3 Frame Current
          3.1.4 Rapid Disconnect
          3.1.5 Protection and Hazards
    3.2 Electrical Hazards
          3.2.1 Electrostatic Discharge (ESD)
          3.2.2 Electromagnetic Interference (EMI)
          3.2.3 Lightning and AC Power Fault
          3.2.4 Miscellaneous
    3.3 Power Backup
          3.3.1 Power Interruption and Restoration
          3.3.2 Transfer Time
          3.3.3 Recoverable Energy
          3.3.4 Recharging
    3.4 Overspeed Prevention
    3.5 Diagnostics and Alarms
          3.5.1 Test Points and Indicators
          3.5.2 Vacuum Monitoring
          3.5.3 Excess Vibration
    3.6 Reliability
          3.6.1 Duty-Cycle
    3.7 Spatial and Weight Requirements
    3.8 Surface and Appearance Criteria
    3.9 Acoustic Noise
    3.10 Toxic Materials
    3.11 Nameplate Ratings
4. Electrical
    4.1 Input Requirements
          4.1.1 Off-Line Power Processing (AC Input)
          4.1.2 On-Line Power Processing (DC Input)
    4.2 Output Requirements
          4.2.1 -48 VDC Output
          4.2.2 Current Sharing
          4.2.3 Overload
          4.2.4 High Voltage Output Shutdown
          4.2.5 Dynamic Response
    4.3 Isolation
5. Environmental and Mechanical
    5.1 Environmental
          5.1.1 Temperature and Humidity Criteria
          5.1.2 Altitude Criteria
          5.1.3 Heat Dissipation
          5.1.4 Fire Resistance
          5.1.5 Weather-Related Exposure
          5.1.6 Miscellaneous Exposure or Hazards
     5.2 Shock and Vibration
          5.2.1 Transportation Vibration
          5.2.2 Equipment Handling
          5.2.3 Low Level Vibration
          5.2.4 Earthquake Performance
     5.3 Critical Vibrations (Resonnant Speeds)
6. System Failure and Containment/Safety
     6.1 General
     6.2 Fail-Safe Design
     6.3 Alarms
     6.4 Containment Analysis and Evaluation
     6.5 Crash Testing
7. Installation
     7.1 General
     7.2 Future Growth
     7.3 Installation Details
          7.3.1 Lifting Details
          7.3.2 Stability
          7.3.3 Intra-system and Inter-system Cabling
     7.4 Maintenance and Replacement
8. Documentation and Packaging
     8.1 Documentation
     8.2 Marking, Packaging, and Shipping
References
List of Figures
1-1. FESS Primary Unit Nomenclature
2-1. Typical DLC, FTTC, or HFC Communications Network Using a Large
      FESS at Remote Site
2-2. Possible FTTC, FTTH, or HFC Communications Network Using a Small
      FESS at Distributed End-Loop Locations
2-3. Off-line Flywheel Energy Storage System (FESS)
2-4. On-Line Flywheel Energy Storage System (FESS)
7-1. Typical FESS Below-Ground Deployment for Large or Small Remote
      Applications
List of Tables

Given in this document are requirements that apply to any flywheel energy storage systems (FESSs), regardless of the technologies employed in the manufacture or design. It is expected that many of these requirements will also apply to possible above-ground flywheel energy storage systems, when it is considered appropriate to deploy in the future.