NHP TemBreak PRO P, Руководство пользователя

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Protection Settings
Long Time Delay (LTD) protection
27
TemBreak PRO
P_BE-UM-001-EN V1.3.0
Adjusting t
r
(Time Delay)
The t
r
time delay defines the trip time of the long-time delay protection for a current of 6 x I
r
. and adjustable via the t
r
dial.
t
r
Adjustment Range (seconds)
0.5 1.5 2.5 5 7.5 9 10 12 14 16
Notice : For the following MCCBs the setting of I
r
and t
r
can limit the setting of I
sd
for STD protection.
P160_BE I
n
= 160A, P250_BE I
n
= 250A
If: I
r
> 0.9 x I
n
and t
r
= 16s I
sd
is limited to 9 x I
r
. even if the dial is set to 10x
Notice : The trip time tolerance for LTD protection is -20% + 20ms to 0% + 30ms.
Example:
For t
r
= 5 s and I = 6 x I
r
, the trip time for long time delay protection will be between 4.02 s and 5.03 s.