NHP TemBreak PRO - Short Time Delay Protection (STD); Adjustment Isd (Current)

Protection Settings
31
TemBreak PRO B_BE-UM-001-EN  V1.1.0
Short Time Delay Protection (STD)
The short time protection is designed to protect against low level short circuits.
Adjustment I
sd
(Current)
The I
sd
trip threshold tolerance for STD protection is ±15%.
Adjustments to I
sd
can only be made by selecting a pre-defined curve. I
sd
trip threshold is defined as a multiple of I
r
as shown in the below table:
Short Time Delay Threshold Multiplier of I
r
Pre-defined curve number
Rating (I
n
)
1
2
3
4
5
6
7
8
9
10
B250
40 A
2.5
2.5
5
10
10
─
─
─
125 A
160 A
250 A
─
─
─
B400
250 A
2.5
2.5
5
10
10
10
10
─
─
─
400 A
B800
630 A
2.5
2.5
5
10
─
10
10
1.6
─
─
800 A
B1000
1000 A
2.5
2.5
5
8
─
8
8
1.6
─
─
B1250
1250 A
2.5
2.5
5
10
─
10
10
1.6
─
─
B1600
1600 A
2.5
2.5
5
10
─
10
10
1.6
─
─
Short Time Delay Settings
Description
S
I
sd
(x I
r
)
Short Time Delay protection threshold
t
sd
(ms)
Short Time Delay