Eaton E Series - System Settings; Overcurrent Protection (Modules I[n])

• Check whether all general and temporary blockings (parameterized and/or via digital•
input) work properly.
Note that all immediate types of acknowledgments (resets) include an LED test, i. e. all LEDs
󰊠ash in red color for a second, then 󰊠ash in green color for a second. Information about
acknowledgments can be found in the “Resets” chapter of the Technical Manual, for the
basic principles see ╚═▷ “3.8 “Ack/Rst” key – Reset (Acknowledge) Latched Signals, Relay
Outputs, Trip Commands”.
Prior to the initial operation of the protection device all tripping times and values shown in
the adjustment list have to be con󰊟rmed by a secondary test.
System Settings
The menu branch [System Para] collects settings that are related to external (󰊟eld /
application) properties rather than to the operation of the protection device itself. In this
category there are, for example, the properties of the CT and VT that are connected to the
protection device.
The following is important to know with respect to the VT settings:
• [System Para / VT] »Main VT sec«: This is the nominal voltage of the Voltage•
Transformers at the secondary side. It is always de󰊟ned as the “line-to-line” voltage.
• [System Para / VT] »Main VT con«: This parameter has to be set (“Open-Delta” or•
“Wye”, depending on the application) in order to ensure the correct assignment of
the voltage measurement channels in the device.
Overcurrent Protection (Modules I[n])
There are several instances (stages) of the Overcurrent Protection module, but all of
these are identically structured. This means it is the responsibility of the commissioning
engineer to set thresholds and timer values such that – for example – the second
instance »I[2]« works like a second overcurrent stage »I>>«.
Moreover, it can be con󰊟gured for each instance separately whether it shall work
in directional or non-directional mode. This is done with the parameter [Device
Planning] »I[n] . Mode«, which can be set to “Non-directional”, “Forward” or “Reverse”.
It is, however, interesting to know that the direction determination is not implemented
as a part of the I[n] modules. It is part of the module Prot (“Module General Protection”),
which acts in this case as a “helping hand” doing the direction determination for all I[n]
modules. This fact does not have an impact on con󰊟guration work, but it is good to know
that some results of directional decisions are signaled by Prot, for example signals such
as »I dir fwd«, »I dir rev«, »IR dir fwd«, … (All these state signals can be found in menu
branch [Operation / Status Display x / Prot].)
Sensitive Ground (Earth) Current
The Sensitive Ground Current must be activated by the following setting: [Protection Para /
Set x / I-Prot / IG[n]] »IX Selection« = “sensitive measurement”
Since the default setting of this parameter is “Calculated” this must be adapted, otherwise
the threshold setting »Pickup (sensitive)« is not available.
60 www.eaton.com E-Series Family Quick Start Guide
4 Good to Know for Commissioning