Protection Settings
Short Time Delay (STD) Protection
35
TemBreak
PRO
P_SE-UM-001-EN
– V1.2.0
Adjusting I
sd
(Current)
The l
sd
trip threshold tolerance for STD protection is ±10%.
Depending on the MCCB ampere frame size, adjustments to I
sd
parameter can be made using one or a combination of the below methods:
-
P_SE OCR rotary dials and embedded display
-
TPED
-
TPCM
P160 and P250
On P160 / P250 ampere frame sizes, there are no I
sd
rotary switches, therefore I
sd
threshold can only be set from one of or combination of the embedded
display, TPED, or TPCM.
Adjustments are made in increments of 0.5 x I
r
between 1.5…10 x I
r
.
I
sd
Threshold Adjustment range
Adjustment step
OFF
–
1.5 to 10 x I
r
0.5
8.
0
xIr
Isd
Notice
: For the following MCCBs the setting of I
r
and t
r
can limit the setting of I
sd
for STD protection.
P160_SE I
n
= 160A, P250_SE I
n
= 250A
If: I
r
> 0.9 x I
n
and t
r
= 16s
I
sd
is limited to 9 x I
r
.
Notice
: In the case where STD protection is disabled (I
sd
= OFF), thermal self-protection parameters I
tsp
and t
tsp
are automatically enabled on the following trip units:
P160_SE
I
n
= 160A, P250_SE
I
n
= 250A
In this case, a supplementary I²t = K curve is added to the end of LTD tripping curve, starting from I
tsp
, where
constant K = Max(I
i
)² x t
tsp
.
Max(I
i
) is the maximum I
i
settable on the trip unit and is not adjustable.
Refer to
Summary of Contents for Terasaki TemBreak PRO P SE Series
Page 106: ...106 TemBreak PRO P_SE UM 001 EN V1 2 0 Annex A Dimensions P160 Dimensions...
Page 107: ...Annex A Dimensions 107 TemBreak PRO P_SE UM 001 EN V1 2 0 P250 Dimensions...
Page 108: ...Annex A Dimensions 108 TemBreak PRO P_SE UM 001 EN V1 2 0 P400 Dimensions...
Page 109: ...Annex A Dimensions 109 TemBreak PRO P_SE UM 001 EN V1 2 0 P630 Dimensions...
Page 111: ...111 TemBreak PRO P_SE UM 001 EN V1 2 0 Annex C I2t Let Through Curves P160_SE...
Page 112: ...Annex C I2t Let Through Curves 112 TemBreak PRO P_SE UM 001 EN V1 2 0 P250_SE...
Page 113: ...Annex C I2t Let Through Curves 113 TemBreak PRO P_SE UM 001 EN V1 2 0 P400_SE...
Page 114: ...Annex C I2t Let Through Curves 114 TemBreak PRO P_SE UM 001 EN V1 2 0 P630_SE...
Page 115: ...115 TemBreak PRO P_SE UM 001 EN V1 2 0 Annex D Peak Let Through Curves P160_SE...
Page 116: ...116 TemBreak PRO P_SE UM 001 EN V1 2 0 P250_SE...
Page 117: ...117 TemBreak PRO P_SE UM 001 EN V1 2 0 P400_SE...
Page 118: ...118 TemBreak PRO P_SE UM 001 EN V1 2 0 P630_SE...
Page 121: ...121 TemBreak PRO P_SE UM 001 EN V1 2 0 This page is intentionally left blank...