Siemens 7SK80 - Negative Sequence Protection (Inverse-Time Characteristics)

Technical Data
4.9 Negative Sequence Protection (inverse-time characteristics)
SIPROTEC, 7SK80, Manual
E50417-G1140-C344-A5, Release date 11.2012
379
4.9 Negative Sequence Protection (inverse-time characteristics)
Setting Ranges / Increments
Functional Limit
Trip Time Curves acc. to IEC
Pickup value 46-TOC (I
2p
)for I
Nom
= 1 A 0.05 A to 2.00 A Increments 0.01 A
for I
Nom
= 5 A 0.25 A to 10.00 A
Time Multiplier T
I2p
(IEC) 0.05 s to 3.20 s or ∞ (disabled) Increments 0.01 s
Time Multiplier D
I2p
(ANSI) 0.50 s to 15.00 s or ∞ (disabled) Increments 0.01 s
Functional Limit for I
Nom
= 1 A all phase currents ≤ 10 A
for I
Nom
= 5 A all phase currents ≤ 50 A
See also Figure 4-7
The trip times for I
2
/I
2p
≥ 20 are identical to those for I
2
/I
2p
= 20.
Pickup Threshold Approx. 1.10· I
2p