hager h3+, Communication Instruction Manual

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31
6LE005550A
Function of the Energy trip unit
3.2 Protection function
The Energy electronic trip unit provides protection against overcurrents
and insulation faults for all types of electrical power distribution. Its protection
characteristics comply with the requirements of standard IEC 60947-2.
List of protection functions
- Long time delay protection - L : Protection against overloads
- Short time delay protection - S : Protection against low current short circuits
- Instantaneous protection - I : Protection against high current short circuits
- Ground protection - G : Protection against ground insulation faults.
I (A)
t (s) L S I
tr
lr lg li lsd
tsd
tg
l²t
l²t
L
Ir Long time delay protection threshold
tr Long time delay
s
Isd Short time delay protection threshold
tsd Short time delay
I²t ON/OFF Curve I²t on short time delay protection activated or not
I Ii Instantaneous protection threshold
G
lg Ground protection threshold
tg Ground protection time delay
I²t ON/OFF Curve I²t on ground protection activated or not
Protection setting means
The parameters for setting the protection can be modified:
- From the Energy trip unit using the adjustment dial and the integrated screen
- from the HTD210H panel display
- from the HTP610H h3+ configuration tool
All protection functions are based on the root-mean-square value (RMS) of the
current to prevent the presence of current harmonics.
The extensive choice of protection curve settings enable selectivity to be
coordinated.