NHP TemBreak PRO P, User Manual

Page: 31 / 66

Protection Settings
Short Time Delay Protection (STD)
31
TemBreak PRO
P_BE-UM-001-EN V1.3.0
Adjusting t
sd
(Time Delay)
The t
sd
time delay can be adjusted from the t
sd
dial, where the tripping delay is given in milliseconds (ms).
An I 2 t function for STD can be enabled by setting the t
sd
dial to a value on the right side, or I 2 t disabled by setting a value on the left side.
For example: The figure below displays t
sd
set to 100ms with I 2 t for STD as enabled.
See
I 2 t function for STD section for more information.
I
sd
Time Delay Adjustment Settings (ms)
50 100 200 300 400
The trip time tolerance for short time delay protection is as follows:
-
For t
sd
= 50 ms: ±30 ms
-
For t
sd
≥ 100 ms: -20 ms / +50 ms