Intermittent Ground Fault Protection - Siemens 7SK80 Manual

Siprotec motor protection
Hide thumbs Also See for 7SK80:
Table of Contents

Advertisement

4.16

Intermittent Ground Fault Protection

Setting Ranges / Increments
Pickup threshold
with INom
with 3I0
with INs
Pickup extension time T
Ground Fault Accumulation Time T
Reset Time for Accumulation T
Number of Pickups for Intermittent Ground Faults 2 to 10
Times
Pickup Times
– Current = 1.25 x Pickup Value
– for ≥ 2 · Pickup Value
Dropout Time (without extension time)
Tolerances
Pickup threshold I
Times T
, T
V
sum
Influencing Variables
Power supply direct voltage in range 0.8 ≤ V
Temperature in range 23.00 °F (-5 °C) ≤ Θ
Frequency in range 25 Hz to 70 Hz
SIPROTEC, 7SK80, Manual
E50417-G1140-C344-A5, Release date 11.2012
for I
Nom
for I
Nom
for I
Nom
for I
Nom
for I
Nom
for I
Nom
v
sum
res
, T
res
= 1 A
0.05 A to 35.00 A
= 5 A
0.25 A to 175.00 A
= 1 A
0.05 A to 35.00 A
= 5 A
0.25 A to 175.00 A
= 1 A
0.005 A to 1.500 A
= 5 A
0.025 A to 7.500 A
0.00 s to 10.00 s
0.00 s to 100.00 s
1 s to 600 s
Approx. 30 ms
Approx. 22 ms
Approx. 22 ms
3 % of setting value or 10 mA for I
or 50 mA for I
= 5 A
Nom
1 % of setting value or 10 ms
≤ 1.15
/V
<1 %
PS
PSNom
≤ 131.00 °F (55 °C) <0.5 %/ K
amb
<5% relating to the set time
Technical Data
4.16 Intermittent Ground Fault Protection
Increments 0.01 A
Increments 0.01 A
Increments 0.01 A
Increments 0.01 A
Increments 0.001 A
Increments 0.001 A
Increments 0.01 s
Increments 0.01 s
Increments 1 s
Increments 1
= 1 A
Nom
395

Advertisement

Table of Contents
loading

Table of Contents