MIL-HDBK-1004/2A
Page
5.1.2
Definitions.....................................
30
5.1.3
Typical Substation Layouts......................
30
5.2
Indoor Unit Substations.........................
30
5.2.1
Preliminary Considerations......................
30
5.2.1.1
Location........................................
30
5.2.1.2
Capacity........................................
30
5.2.1.3
Safety..........................................
31
5.2.2
Design..........................................
31
5.2.2.1
Mounting........................................
31
5.2.2.2
Short-Circuit Duty..............................
31
5.2.2.3
Primary Protection..............................
31
5.2.2.4
Lightning Protection............................
31
5.2.2.5
Secondary Protection............................
31
5.2.2.6
Instrumentation.................................
31
5.2.3
Arrangements....................................
32
5.2.3.1
Reversed........................................
32
5.2.3.2
Double-Ended....................................
32
5.2.3.3
Secondary Spot-Network..........................
32
5.2.4
Transformer Insulations.........................
32
5.2.4.1
Dry-Type Units..................................
33
5.2.4.2
Nondry-Type Units...............................
33
5.2.4.3
Insulation Comparisons..........................
33
5.2.5
Unit Substation Rooms...........................
33
5.2.5.1
Drainage........................................
33
5.2.5.2
Access..........................................
33
5.2.5.3
Ventilation.....................................
39
5.2.5.4
Noise...........................................
40
5.2.5.5
Emergency Lighting..............................
40
5.3
Outdoor Utilization Voltage Substations.........
40
5.3.1
Secondary Unit Substation Types.................
40
5.3.2
Pad-Mounted Compartmental-Type Transformer Units
40
5.3.2.1
Units 500 Kilovolt-Amperes and Smaller..........
40
5.3.2.2
Units Larger than 500 Kilovolt-Amperes..........
40
5.4
Outdoor Distribution Voltage Substations........
40
5.4.1
Structure-Mounted Equipment.....................
41
5.4.2
Transformers....................................
41
5.4.3
Connection to Primary Distribution Lines........
41
5.5
Substation Considerations.......................
41
5.5.1
Site Effects....................................
41
5.5.2
Electric Configuration..........................
41
5.5.3
Incoming-Line Switching.........................
42
5.5.3.1
Circuit Breakers................................
42
5.5.3.2
Switches........................................
42
5.5.3.3
Current Limiting Protectors.....................
42
5.5.4
Outgoing-Feeder Switchgear......................
42
5.5.4.1
600 Volts and Less..............................
42
5.5.4.2
Over 600 Volts..................................
43
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