Application And Setting Notes - Siemens 7SR51 Device Manual

Application and Setting Notes

5.23.4
Parameter: Function Config > 59N Overvoltage
•
Default setting: Disabled
This setting is located in the Function Config menu and is used to allow the 59N function to be
switched on and off if it is not required. If this setting is set to Disabled, the 59DT and 59IT elements
are not available for configuration. A separate setting is also provided for each element for use when 59N
is set to Enabled.
Parameter: 59N Common > Input Selection
•
Default setting: Vn
This setting is common to the 59NDT and 59NIT elements and is used to allow the elements to operate
from either Vn, the calculated neutral voltage derived from the sum of the 3 phase voltages, or Vx, the
voltage measured directly using the V4 voltage input.
Parameter: 59NDT-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: 59NDT-n Setting
•
Default setting: 5 V
This is the operating voltage threshold of the element. The element will pickup if the voltage rises above
this value. This should be set to suit the individual application.
Parameter: 59NDT-n Delay
•
Default setting: 0.1 s
This is the time delay setting for the DTL element. This should be set to suit the individual application.
Parameter: 59NIT-n Setting
•
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: 59NIT-n Setting
•
Default setting: 5 V
This is the operating voltage threshold of the element. The element will pickup if the voltage rises above
this value. This should be set to suit the individual application.
Parameter: 59NIT-n Char
•
Default setting: DTL
This setting defines the characteristic of the inverse curve. Any custom voltage curve that has been
configured can be selected from the list. The characteristic can also be set as DTL so that 2 DTL elements
are available (59NDT and 59NIT).
Reyrolle 7SR5, Overcurrent Protection Device, Device Manual
C53000-G7040-C014-1, Edition 11.2019
Protection and Automation Functions
5.23 59N Neutral Voltage Displacement
315