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Technical Data

4.31 Breaker Failure Protection (ANSI 50BF)

SIPROTEC, 7UM62, Manual

C53000-G1176-C149-7, Release date 03.2010

507

4.31 Breaker Failure Protection (ANSI 50BF)

Setting Ranges / Increments

Times

Tolerances

Influencing Variables for Pickup Values

Pickup thresholds B/F I>for I

= 1 A 0.04 A to 2.00 A Increments 0.01 A

for I

= 5 A 0.20 A to 10.00 A Increments 0.01 A

Delay Time BF-T 0.06 s to 60.00 s or ∞ Increments 0.01 s

Pickup Times

– On Internal Start

– Using Controls (CFC)

– For external Start

Dropout Time

approx. 50 ms

Pickup threshol B/F I>for I

= 1 A 1 % of setting value or 10 mA

for I

= 5 A 1 % of setting value or 50 mA

Delay Time BF-T 1 % or 10 ms

Power supply direct voltage in range 0.8 ≤ U

Aux

AuxN

≤ 1.15 ≤ 1%

Temperature in range 23.00 °F (–5 °C) ≤ Θ

amb

≤ 131.00 °F (55 °C) ≤ 0.5 %/10 K

Frequency in range 0.95 ≤ f/f

≤ 1.05 ≤ 1%

Harmonics

– Up to 10 % 3rd harmonic

– Up to 10 % 5th harmonic

≤ 1%

Siemens SIPROTEC 7UM62 User Manual

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