ABB REC650 Applications Manual page 315
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Also See for REC650:
- Technical manual (700 pages) ,
- Commissioning manual (118 pages) ,
- Product manual (109 pages)
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1MRK 511 286-UUS A
Application manual
A071114 V3 EN
Figure 137:
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 12
Monitoring
309
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