29
TemBreak
PRO
P_SE-UM-001-EN
– V1.2.0
Protection Settings
Trip Curve
The TemBreak
PRO
P_SE electronic trip unit protects against overcurrent and short circuit faults for many types of electrical distribution systems.
The SE OCR has protective characteristics according to the requirements of the standard AS/NZS IEC 60947.2.
Depending on the protection type, adjusting protection parameters can be made using one or combination of the below methods:
-
P_SE OCR rotary switches and embedded display
-
TPED
-
TPCM
All protection functions are based on the effective value (RMS) of power, to reduce the effects of current harmonics.
The wide range of protection curves adjustments assist in being able to achieve Selectivity combinations of upstream and downstream protection.
List of Protection Functions
Abbreviation
Description
Protection against
Symbol
Definition
L
Long-time delay (LTD)
protection
Low level current overload
I
r
Threshold long time protection
t
r
Long Time Delay
S
Short-time delay (STD
protection
Low level short-circuit
I
sd
Threshold short time protection
t
sd
Short Time Delay
I²t ON / OFF
I²t curve on Short delay protection activated or not
I
Instantaneous (INST)
protection
Larger short-circuit
I
i
Instantaneous protection threshold
G
Ground/Earth protection
Ground / Earth fault
I
g
Earth Protection Threshold
t
g
Delay protection Earth
I²t ON / OFF
I²t curve on Earth protection or not activated
Time-current curve
Summary of Contents for Terasaki TemBreak PRO P SE Series
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Page 111: ...111 TemBreak PRO P_SE UM 001 EN V1 2 0 Annex C I2t Let Through Curves P160_SE...
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Page 115: ...115 TemBreak PRO P_SE UM 001 EN V1 2 0 Annex D Peak Let Through Curves P160_SE...
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