[ueb-einph-kesselschut-020926-st, 1, en_GB]
Figure 2-91
Principle of tank leakage protection
Setting Notes
General
The single-phase time overcurrent protection can be switched at address 2701
1Phase O/C
ON
- or
OFF
. The
option
Block relay
allows to operate the protection but the trip output relay is blocked.
The settings depend on the application. The setting ranges depend on whether a “normal” or a “high-sensi-
tivity” current input is used. This was determined during assignment of the protection function (Section
2.1.4.3 Assignment of Protection Functions to Measuring Locations / Sides
, margin heading “Further 1-phase
Protection Functions”) and the properties of the 1- phase measuring inputs (Section
under
2.1.4.1 Topology of the Protected Object
, margin heading “High-Sensitivity Additional 1-phase Meas-
uring Locations”).
•
If you have declared the type of the corresponding 1-phase current input as (address 255 and/or 256) as
1A/5A input
input, set the pickup value
1Phase I>>
under address 2702, the pickup value
1Phase
I>
under address 2705. If only one stage is required, set the other to ∞.
•
If you have declared the type of the corresponding 1-phase current input as (address 255 and/or 256) as
sensitiv input
, set the pickup value
1Phase I>>
under address 2703, the pickup value
1Phase
I>
under address 2706. If only one stage is required, set the other to ∞.
If you require a trip time delay, set it for the
Ι
>> stage at address 2704
T 1Phase I>>
, and for the
Ι
> stage at
address 2707
T 1Phase I>
. If no delay time required, set time to 0 s.
The set times are pure delay times which do not include the inherent operating times of the protection stages.
If you set a time to ∞, the respective stage does not trip but a pickup annunciation will be signalled.
A detailed description for the use as high-impedance protection and tank leakage protection is set out below.
Use as High-Impedance Differential Protection
When used as high-impedance protection, only the pickup value of the single-phase overcurrent protection is
set on the 7UT6x to detect overcurrent at the assigned highly sensitive 1-phase current input.
However, the entire function of the high-impedance unit protection is dependent on the coordination of the
current transformer characteristics, the external resistor R and the voltage across R. The following three
header margins entail information with regard to these considerations.
Current Transformer Data for High-Impedance Protection
All current transformers must have identical transformation ratio and nearly equal knee-point voltage. This is
usually the case if they are of equal design and have identical rated data. If the saturation voltage is not
stated, it can be approximately calculated from the rated data of a CT as follows:
2.7.4
Functions
2.7 Single-Phase Time Overcurrent Protection
SIPROTEC 4, 7UT6x, Manual
181
C53000-G1176-C230-5, Edition 09.2016
Содержание SIPROTEC 4 7UT6 Series
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