DEMA 400 Series User Manual

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threshold is not exceeded until the end of this period, the protection function trip time counter
will be reseted. Reset delay thresholds are in the range of (0-60).
4.3.5.5.7 Hysteresis
It allows the selection of the minimum and maximum values for the protection to be activated
by entering the entered value in percentages and the same value being switched off in
percentage. For example, if the Wattmetric Earth Protection start value is set to 100 Ien W,
the hysteresis value is set to 5%, Protection is active when it exceeds 105 Ien W; protecton is
disactive when it falls 95 Ien W. This hysteresis value can be selected from 1% to 20%.
4.3.6 General Protection Settings
4.3.6.1 Pe-Iecos Protection
These settings are valid for the All thresholds for Wattmeter earth protection. It is located on
the device under this sections: Main Menu> Protection Settings> General Protection Settings>
Pe-Iecos Protection
4.3.6.1.1 Mod
This mode must be selected if wattmeter earth protection is to be operated via E x cos value.
4.3.6.1.2 RCA
It is the phase shift value in Wattmeter protection.
4.3.6.2 Frequency Protection
These are the general protection settings that apply to all frequency protections.
4.3.6.2.1 Block U
Used to prevent frequency protections when the measured voltage falls below the value set in
Block U.
4.3.6.2.2 Number of Cycles

DEMA 400 Series Specifications

General

Brand	DEMA
Model	400 Series
Category	Relays
Language	English