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2
Description of Relay
2.4
Protection Functions Available At 60Hz
7UT513
-
-
87T
3 87T
2
87G
87B
x
x
x
x
x
x
x
x
x
7UT512
87T-2
87G
x
x
Protection Functions @ 60 Hz
Table 2.1
2.5
Inputs and Outputs
Current Inputs
Rated current, In
Rated frequency
Power consumption
1A rated current input
5A rated current input
Highly sensitive tank current input (if ordered) at 1A
Overload handling capability (normal current inputs)
Thermal (rms)
Dynamic (pulse current)
Overload handling capability for highly sensitive tank
current detection
Thermal (rms)
18
-
-
3 87B
2 50/51
64T
x
x
x
x
x
x
(x)
x
(x)
x
x
(x)
87B-2 50/51
x
x
x
x
-
-
87N
49
A
49
B
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
(x)
x
x
x
x
(x)
x
x
x
x
x
x
x
49-A
49-B
x
x
x
x
x
x
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.
1 A or 5A (specified when ordered, or by hardware modification)
-
50 Hz, 60 Hz, or 16
2/3 Hz (selectable)
approximately 0.1 VA
approximately 0.4 VA
approximately 0.2 VA
100 × rated current for ≤ 1 s
20 × rated current for ≤ 10 s
4 × rated current continuous
250 × rated current for one
300 A for ≤ 1 s
100 A for ≤ 10 s
15 A continuous
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
-
half cycle
7UT51 v3
PRIM-2330C
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