Parameter Value
Description
Disabled
This element is switched out and is not available.
Enabled
The element is available for use and can be parameterized.
Parameter:
51V Setting
•
Default setting:
30 V
This setting defines the operating voltage threshold of the element. When the phase to phase control
voltage is below this voltage setting the phase current settings of the 51-n elements on the affected
phase will be modified by the
51V Multiplier
. The phase allocation of control voltages is as shown
below:
Current Element
Control Voltage
I
A
V
AB
I
B
V
BC
I
C
V
CA
If the voltage falls below setting when the 51-n element is picked up, the element does not reset and will
continue to time out towards operation at the 51V rate.
The voltage setting should be set to suit the individual application.
Parameter:
51V VTS Inhibit
•
Default setting:
No
This setting defines the operating voltage threshold of the element. When the applied voltage is below
this setting the element will pickup.
The voltage setting should be set to suit the individual application.
Parameter:
51-n Element
•
Default setting:
Disabled
This setting is used to allow the element to be switched on and off if it is not required. A separate setting
is provided for each element.
These settings can be used to select the number of elements required.
Parameter Value
Description
Disabled
This element is switched out and is not available.
Enabled
The element is available for use and can be parameterized.
Parameter:
51
‑
n Measurement
•
Default setting:
RMS
Selects whether fundamental frequency RMS or the true RMS value of the measured currents used.
Protection and Automation Functions
5.14 51 Time-Delayed Overcurrent – Phase
232
Reyrolle 7SR5, Transformer Protection Device, Device Manual
C53000-G7040-C015-1, Edition 11.2019
Содержание Reyrolle 7SR5
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