Technical Data
Effective: May 1998
Page
2
TD.44A.01.T.E
Cutler-Hammer
Magnum DS
Metal-Enclosed
Low-Voltage Switchgear
Why Magnum DS Switchgear . . . . . . . 2
Ratings
Voltage Ratings. . . . . . . . . . . . . . . . . . . 3
Bus Ratings . . . . . . . . . . . . . . . . . . . . . . 3
Standards . . . . . . . . . . . . . . . . . . . . . . . 3
Magnum DS Breakers . . . . . . . . . . . . . 3
Breaker Control Voltages . . . . . . . . . . . 3
Sensors and Rating Plugs . . . . . . . . . . 4
Ground Fault Settings . . . . . . . . . . . . . 5
Digitrip RMS Trip Curves . . . . . . . . . 6-8
CT Metering Accuracies . . . . . . . . . . . . 9
Voltage Transformers. . . . . . . . . . . . . . 9
Control Power Transformers . . . . . . . . 9
Why Magnum DS Switchgear
Cutler-Hammer Magnum DS switch-
gear is backed by 25 years of power
circuit breaker and switchgear devel-
opment that have set the industry
standards for quality, reliability, main-
tainability and extended operating life.
Magnum DS switchgear is designed to
meet the changing needs of our cus-
tomers by providing:
■
Lower maintenance costs
■
Higher interrupting ratings
■
Better coordination capability
■
Increased tripping sensitivity
■
Better metering accuracy
■
Higher quality and reliability
■
State-of-the-art monitoring and
communications
Magnum DS switchgear can meet the
needs for general applications, ser-
vice entrance, harsh environments,
multiple source transfer, special
grounding systems and many others.
Modern designed Magnum DS Metal-
Enclosed Low-Voltage Switchgear
and Power Circuit Breakers provide:
■
100% rated, fully selective
protection
■
Integral microprocessor-based
breaker tripping systems
■
Two-step stored-energy breaker
closing
■
100 kA short circuit bus bracing
standard
■
Optional 150 kA and 200 kA short
circuit bus bracing, without preced-
ing current limiting fuses
■
Optional metal barriers isolates the
cable compartment from the bus
compartment
Many other features for coordinated,
safe, convenient, trouble-free and
economical control and protection of
low-voltage distribution systems are
also provided.
Magnum DS Switchgear assemblies
have undergone an extensive seismic
qualification program. The test pro-
gram utilized ANSI standard C37.81,
the Uniform Building Code (UBC) and
the California Building Code (CBC) as a
basis for the test program. The assem-
blies have been tested and qualified to
exceed these requirements.
Magnum DS Switchgear conforms to
the following standards: NEMA SG3
and SG5, CSA, ANSI C37.20.1, C37.51,
and UL Standard 1558 and is built in
an ISO certified facility.
Maximum ratings for Magnum DS
Switchgear are 600 volts ac, 6000
amperes continuous cross bus and
200,000 amperes short circuit capacity.
Application
Standards. . . . . . . . . . . . . . . . . . . . . . 10
Voltage/Frequency . . . . . . . . . . . . . . 10
Continuous Current Ratings . . . . . . . 10
Altitude. . . . . . . . . . . . . . . . . . . . . . . . 10
Unusual Environments . . . . . . . . . . . 10
Unit Substations . . . . . . . . . . . . . . . . 11
Types of Systems . . . . . . . . . . . . . . . 12
System Application . . . . . . . . . . . . . . 13
Main Breakers . . . . . . . . . . . . . . . . . . 13
Tie Breakers . . . . . . . . . . . . . . . . . . . . 13
Generator Breakers . . . . . . . . . . . . . . 13
Feeder Breakers. . . . . . . . . . . . . . . . . 14
Ground Fault . . . . . . . . . . . . . . . . 15, 20
High-Resistance Grounding . . . . . . . 17
Zone Selective Interlocking . . . . . . . 18
Fault Currents . . . . . . . . . . . . . . . . 23-25
Breaker Arrangements . . . . . . . . . 26-29
Switchgear Section View . . . . . . . . . 30
Floor Plan/Conduit Area . . . . . . . . . . 31
Center of Gravity . . . . . . . . . . . . . . . . 31
Heat Loss . . . . . . . . . . . . . . . . . . . . . . 32
Weights . . . . . . . . . . . . . . . . . . . . . . . 32
Features
Structure . . . . . . . . . . . . . . . . . . . . . . . 33
Bus . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Wiring . . . . . . . . . . . . . . . . . . . . . . . . . 35
Instrumentation . . . . . . . . . . . . . . . . . 36
Accessories/Options . . . . . . . . . . . . . 36
Magnum DS Breaker . . . . . . . . . . .37-38
Typical Specification . . . . . . . . . . . . . 40
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