America's Space Shuttle: Electrical Power System NASA Astronaut Training Manual (EPS 2102)
National Aeronautics and Space Administration (NASA), World Spaceflight News
Smashwords Edition
Copyright 2012 Progressive Management
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Space Shuttle Electrical Power System Training Manual
EPS 2102
Mission Operations Directorate
Space Flight Training Division
Current as of January 1995
Originally published February 1994
National Aeronautics and Space Administration
Lyndon B. Johnson Space Center
Houston, Texas
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Preface
This training manual is designed to furnish you with the operational knowledge needed by a crewmember to successfully interface with the electrical power system (EPS). The training manual does not contain the actual flight data file (FDF) procedures but explains how the crew interfaces with the electrical power system to accomplish the procedures.
This training manual is divided into four sections. Section 1 (Introduction) is a brief overview of the EPS and of the subsystems that are associated with the EPS. Section 2 is a detailed description of the power reactant storage and distribution (PRSD) subsystem. The fuel cell subsystem is described in section 3 and the electrical power distribution and control (EPDC) subsystem in section 4.
Begin each section by reading the objectives and the learning material. If you are already familiar with the subject matter, skip to the section exercises. If the material is new to you, be sure to read all the text carefully before you complete the exercises. The purpose of the exercises is to emphasize the information you should have learned from reading the associated section.
Before progressing to another section, you should understand the correct answers to each of the exercises. The answers explain the correct response and tell where the responses can be found in the text.
Section 1: Introduction
The electrical power system (EPS) consists of the equipment and the reactants which produce and distribute electrical power throughout the orbiter, fulfilling all the orbiter external tank (ET), solid rocket booster (SRB), and payload power requirements when not connected to ground support equipment (GSE). The operation of the EPS can be divided into three critical functions: (1) energy storage, (2) power production, and (3) power distribution. Each of these functions is supplied by a separate system as shown in figure 1-1.
The power reactant storage and distribution (PRSD) subsystem provides energy storage. It stores energy in chemical form as cryogenic hydrogen (H2) and oxygen (O2) and supplies these reactants for use in power production. The PRSD subsystem also supplies O2 to the environmental control and life support system (ECLSS) for crew respiration.
The fuel cell (FC) subsystem provides power production. This subsystem consists of three fuel cells which consume the O2 and the H2 provided by the PRSD subsystem and, through a chemical reaction, produce direct current (dc) electricity. The FC subsystem also supplies potable water (H2O) to the ECLSS.
The electrical power distribution and control (EPDC) subsystem provides power distribution. This subsystem distributes the dc power generated by the fuel cells to all the dc loads and generates and distributes alternating current (ac) power to all the ac loads.
Each of these subsystems is described in more detail in the following sections of this workbook.
Section 2: Power Reactant Storage and Distribution (PRSD) Subsystem
Objectives
The student should be prepared to accomplish the following tasks as a result of studying this section of the workbook.
1. Describe the purpose of the PRSD subsystem.