Siemens 7UT51 User Manual

10
Tank Leakage Protection (64T)
7UT51 v3
114 PRIM-2330C
Once the tank-leakage element exists, it can be
configured. Its normal operational status is set in
Address 2701.
10.3 Pickup and Dropout
Levels
Depending on the type selected in Address 7827, the
pickup level is specified as either a fraction (or
multiple) of the rated nominal current of the protected
object (Address 2703), or as an absolute tank-leakage
current (Address 2704)
The measured current value compared to the pickup
level can be either the true rms current, or only the
fundamental component.
The dropout level of the tank leakage element is
specified as a fraction of the pickup level. Avoid a high
level since arc faults within the tank can produce
considerable current fluctuations.
2701 TANK
Normal operational status of tank
-
leakage
protection element.
Option Description
OFF 64T element is inactive (default).
ON 64T element is active.
BLOCK
TRIP REL
64T element is active except that
trip contacts and signal contacts
will not respond to 64T trip events.
2703 I> TANK
Pickup level for sensitive (type A) tank leakage
protection, specified as a fraction or multiple of the
rated nominal current of the protected object.
(Address 7827 must be set to “INSENSITIVE CT A.”)
Range: 0.10
–
10.00 I
n
Default: 0.50 I
n
Operating Tolerance: 5% of setting value
2704 I> TANK
Pickup level for highly sensitive (type B) tank
leakage protection, specified as a absolute current in
milliamperes. (Address 7827 must be set to
“SENSITIVE CT B.”)
Range: 10
–
1000 mA
Default: 500 mA
Operating Tolerance: 5% of setting value
2705 RMS FORMAT
Choice of whether to calculate the true r.m.s
tank leakage current (including harmonics) or
just use the fundamental component.
Option Description
WITHOUT
HARMON.
Fundamental component
only (default)
WITH
HARMONICS
True rms current, including
harmonics
2709 D.OFF TNK
Dropout level as a fraction of the pickup level.
This value is also used as the reset level.
Range: 0.25
–
0.95 (unitless)
Default: 0.50
Operating Tolerance: 5% of setting value

Siemens 7UT51 Specifications

General

Brand	Siemens
Model	7UT51
Category	Relays
Language	English