2
Description of Relay
7UT51 v3
18 PRIM-2330C
2.4 Protection Functions Available At 60Hz
Table 2.1
Protection Functions @ 60 Hz
Table 2.1 lists the protection functions
that are available for the 7UT513 and
7UT512 at 60Hz.
Note:
The choice of frequency
affects the availability the
auxiliary protection functions.
With rated frequency 60Hz,
the backup overcurrent time
protection or the restricted
earth fault protection/tank
leakage protection
(dependent on the ordered
model) can be used besides
the differential protection for
transformers. If the
three-winding transformer
protection is to be used, only
the backup overcurrent time
protection is available.
With rated frequency 50Hz, the
backup overcurrent time protection or
the restricted earth fault protection/tank leakage
protection (dependent on the ordered model) can be
used in addition to the differential protection for
transformers.
With rated frequency 16 2/3 Hz, no restriction
concerning the additional functions are present.
2.5 Inputs and Outputs
Current Inputs
Rated current, In 1 A or 5A (specified when ordered, or by hardware modification)
Rated frequency 50 Hz, 60 Hz, or 16
-
2/3 Hz (selectable)
Power consumption
1A rated current input
5A rated current input
Highly sensitive tank current input (if ordered) at 1A
approximately 0.1 VA
approximately 0.4 VA
approximately 0.2 VA
Overload handling capability (normal current inputs)
Thermal (rms)
Dynamic (pulse current)
100 × rated current for ≤ 1 s
20 × rated current for ≤ 10 s
4 × rated current continuous
250 × rated current for one
-
half cycle
Overload handling capability for highly sensitive tank
current detection
Thermal (rms)
300 A for ≤ 1 s
100 A for ≤ 10 s
15 A continuous
7UT513
87T
-
3 87T
-
2 87G 87B
-
3 87B
-
2 50/51 64T 87N 49
-
A 49
-
B
xxxx
xxxx
xxxx
x xxx
xx xx
xx xx
x (x) x x
x (x) x x
x (x) x x
x (x) x x
xxxx
x (x) x x x
7UT512
87T
-
2 87G 87B
-
2 50/51 49
-
A 49
-
B
xxxx
xx xx
xxxx
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