High-Set Element (50Hs); Overcurrent Element (50 Or 51) - Siemens 7UT51 Instruction Manual

8
Time Overcurrent Protection (50HS and 50/51)
8.3 High Set Element
-
(50HS)
The high-set overcurrent element (50HS) has its own
pickup threshold level (Address 2103) and time delay
(Address 2104). They should be set so that the 50HS
element will not trip outside the zone of protection.
2103 50HS PU
Pickup threshold level for the high
element (50HS), which is specified as a multiple of the
rated nominal current (I
N
side) of the protected object. A 50HS pickup will occur if
the fundamental component of a measured
-
phase current reaches this threshold.
–
Range: 0.10 30.00 I
n
Default: 4.00 I
n
2104 50HS DELAY
Time delay between high
and trip. At least one measured phase
remain above the 50HS pickup threshold for this
duration for a trip to occur. This time delay is in addition
to the inherent operating time of the element. The value
∞ will prevent a 50HS trip.
32.00 s, or ∞
–
Range: 0.00
Default: 0.10 s
100
-
set overcurrent
) of the monitored winding (or
-
set overcurrent (50HS) pickup
-
current must
8.4 Overcurrent Element
(50 or 51)
The overcurrent element can have either a
definite-time (50) time delay or an inverse-time (51)
time delay with a choice of three types of ANSI
characteristic curves. The choice is made in
Address 2111.
2111 PH CHARACT
Type of time overcurrent element: definite
-
inverse time (51), including choice of inverse
characteristic.
Option Description
DEFINITE TIME Overcurrent element has a
definite
MODERATELY Overcurrent element has an
INV. inverse
Moderately Inverse characteristic
curves (see Figure 8.1 on page 103).
VERY INVERSE Overcurrent element has an
inverse
Inverse characteristic curves
(see Figure 8.2 on page 104).
EXTREMELY Overcurrent element has an
INVERSE inverse
Inverse characteristic curves (see
Figure 8.3 on page 105).
7UT51 v3
-
time (50) or
-
time
-
time delay (50).
-
time delay (51) with
-
time delay (51) with Very
-
time delay (51) with Extremely
PRIM-2330C