51
Arc Flash Mitigation
A high concern for the electrical industry are incidents of arc flash, whereby a fault is initiated that causes
damage to the equipment or serious injury to operators. These faults can be caused by many factors such as poor
maintenance, equipment failure, or operator error.
In recognition of this many relay manufacturers have produced arc detection features. These generally include the
standard relay functions plus an instantaneous trip driven by arc-detecting fiber optic cables within switchgear
cubicles.
The purpose of these relays is to interrupt the arc fault through instant tripping of upstream devices. The faster the
arc is suppressed, the lower the energy output and therefore less damage to equipment plus improved operator
safety.
Tavrida ISM_Shell_2 series breakers unique high speed opening characteristics allow for a packaged solution. The
VCB_FAS system is comprised of specially selected ISM15_Shell_2 breakers, control modules with a faster command
recognition speed, and optional arc mitigation relays.
The timing of the system can be broken down by the following table, using the SEL-751 relay as an example of total
timing calculation:
Product Parameters
Designation
Response Time
ISM15_Shell_2 opening time (including CM)
Topen
12 ms
ISM15_Shell_2 interrupting time (including CM)
Tinterrupt
20 ms
ISM15_Shell_2 closing time (including CM)
Tclose
26 ms
SEL-751 arc flash detection time
Tsel751
4 ms
Interruption time after arc initiation
T Tinterrupt
24.3 ms
6
Summary of Contents for ISM Shell_2 Series
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Page 7: ...7 Introduction 1...
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Page 45: ...45 Signalling 6...
Page 49: ...49 Special Applications Fast Switching 6...
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Page 55: ...55 Dimens ions and Weights 8...
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Page 62: ...62 Circuit Diagrams 9...
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Page 66: ...66 Technical Data 10...
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