Siemens 7UT51 User Manual

7UT51 v3
Description of Relay
2
PRIM-2330C 25
2.11 Overcurrent Protection (50/51 and 50HS)
Table 2.8
Specifications for Overcurrent Protection (50/51 and 50HS) (details in Chapter 8)
Settings
Operational status Active, inactive, or block
-
contacts; choice can be temporarily
changed using binary
-
signal inputs
50HS Minimum current required for pickup 0.10 to 30.00 times I
n (0.01steps)
50HS Delay Time 0.00 to 32.00 s, (0.01s steps) or ∞
50T Minimum current required for definite time pickup 0.10 to 30.00 times I
n (0.01steps)
50T Delay Time for definite time pickup 0.00 to 32.00 s, (0.01s steps) or ∞
51 Minimum current required for inverse time pickup 0.10 to 20.00 times I
n (0.01steps)
51HS Delay Time for inverse time pickup 0.50 to 32.00 s, (0.01s steps) or ∞
Pickup Threshold (approximate) 1.1 times 51PU
Reset Time Delay 0.00 to 60.00s (0.01s steps)
Events that can control signal contacts, trip contacts, or
LEDs
Change in operational status; pickup, dropout, trip, and reset
events, start of time delay before trip. All events are logged, as
are the amplitude of the current at the time of a trip.
Inherent Operating Times
60 Hz 50 Hz 16
-
2/3 Hz
50 and 50HS measuring time (when current is at two times
setting level, without parallel operation of other protection
functions)
60 ms 60 ms 150 ms
51 Tripping Time Characteristics see Section 8.4.2
on page 101
see Section 8.4.2
on page 101
see Section 8.4.2
on page 101
Dropout time (50 and 50HS; approximate) 75 ms 75 ms 210 ms
Overshot time (approximate) 75 ms 75 ms 210 ms
Dropout Ratios
50/51 and 50HS dropout ratios (dropout/pickup;
approximate)
0.95
Operating Tolerances
50 and 50HS functions ±3% of setting value
50 and 50HS time delays greater of 10 ms or ±1% of setting value
51 function pickup occurs when current between is 105% and 115% of
setting
51 time delay greater of 30 ms or ±5% of setting value
Effect of Environmental Influences on Times and Tolerances
Supply power voltage ≤ 1% if between 80% and 115% of nominal voltage
Ambient temperature ≤ 0.5% / 10 K if between 0°C and 40°C (32°F and 104°F)
System frequency for 50 and 50HS protection ≤ 1.5% if between 98% and 102% of nominal frequency
≤ 2.5% if between 95% and 105% of nominal frequency
System frequency for 51 protection ≤ 8% of theoretical time if system frequency between 95% and
105% of nominal frequency

Siemens 7UT51 Specifications

General

Brand	Siemens
Model	7UT51
Category	Relays
Language	English