“Low imped. / IP,max” Operating Mode

Using this operating mode differential current Id and restraining current IR are defined as follows:

When compared to the “Low imped. / sum(IP)” operating mode, a double slope tripping characteristic can be used here because of the definition of the restraining current (see Fig. 3-107). In particular, this tripping characteristic permits a tripping test under load current by shorting a phase current (to simulate residual current) without the need of star point current IY.

Besides the Idiff> parameter, already available to set the basic pick-up sensitivity, the following parameters are also provided with the “Low imped. / IP,max” operating mode to set the tripping characteristic; in this case IR,m2 is equivalent to Iref.

Address				Description	Range of Values *
PS1	PS2	PS3	PS4	Description	Range of Values *
072 162	073 162	074 162	075 162	REF_1: m1 PSx	0.00 … {0.20} … 1.00
072 163	073 163	074 163	075 163	REF_1: m2 PSx	0.15 … {1.50}
072 164	073 164	074 164	075 164	REF_1: IR,m2 PSx	0.10 … {1.00} … 1.50
072 172	073 172	074 172	075 172	REF_2: m1 PSx	0.00 … {0.20} … 1.00
072 165	073 165	074 165	075 165	REF_2: m2 PSx	0.15 … {1.50}
072 166	073 166	074 166	075 166	REF_2: IR,m2 PSx	0.10 … {1.00} … 1.50

* Default setting in curly braces {}

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