ABB REL650 Applications Manual page 459
Line distance protection relion 650 series
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Also See for REL650:
- Technical manual (942 pages) ,
- Commissioning manual (208 pages) ,
- Product manual (118 pages)
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1MRK 506 334-UUS A
Application manual
A071114 V3 EN
Figure 213:
Trip Curves for a typical 12 kV, 630 A, 16 kA vacuum interrupter
Nr
the number of closing-opening operations allowed for the circuit breaker
Ia
the current at the time of tripping of the circuit breaker
Calculation of Directional Coefficient
The directional coefficient is calculated according to the formula:
Section 14
Monitoring
453
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