hager hw+ User Manual

58 6LE008146B
Protection functions
4.6. Neutral protection
Neutral protection is built into the 4-pole circuit breakers and available as an option with the
addition of the ENCT external neutral sensor on 3-pole versions. It is particularly useful if the
neutral conductor section is less than that of the phases, or if the neutral conductor is heavily
loaded (for example, in oce buildings).
It uses similar tripping curve characteristics as the Long time delay, Short time delay and
instantaneous protection parameters.
Neutral protection curve
I (A)
t (s)
tsd
N=100%N=50%
lr lilsd
Neutral protection
The neutral protection is adjusted from the PROTECTION NEUTRAL menu of the sentinel
Energy display, the panel display or the Hager Power setup software.
Adjusting the Ir and Isd neutral protection thresholds
N coecient adjustment range (%) Parameters impacted
Activation Neutral protection time delay
50 - 100 - 150 - 200
The coecient is applied to the adjustment
value of the Ir and Isd thresholds for the
phases.
For a setting at 150 or 200 %, the maximum value of the neutral protection setting is limited by
the rating plug of the circuit breaker.
For example for an HW1 circuit breaker (maximum rating 1600A) with an Ir setting at 1000A
and a neutral protection setting at 200%, the Ir neutral threshold value will be limited to
1600A and not 2000A.
The Ii protection (Instantaneous protection) remains identical to that of the phases.
On a 3-pole product and in the absence of an ENCT external neutral current sensor, the
factory setting must be kept at O.
Neutral protection time delay
The time delays for neutral protection remain identical to the phase time delay adjustment
values.

hager hw+ Specifications

General

Brand	hager
Model	hw+
Category	Circuit breakers
Language	English