GE Industrial Solutions EntelliGuard TU Trip Units - Manual (Page 14)

EntelliGuard TU Trip Units: UL/ANSI Models DEH-4567B
General Information
4 ©2012 General Electric All Rights Reserved
the high peak, low energy let-through current allowed by a
current limiting fuse or circuit breaker while in the process
of melting or tripping. This algorithm allows the adjustable
selective instantaneous to be set low and yet be selective
in high prospective fault current systems. WFR allows
circuit breakers to trip instantaneously for faults within
their zone of protection while maintaining instantaneous
clearing times in the 3-3.5 cycle range, depending on
circuit breaker type, facilitating maximum arc flash
mitigation possible with no sacrifice in selectivity.
WFC: Waveform Capture – an optional feature that
captures an oscillographic record of system current and
voltage at the moment the breaker trip unit is triggered.
Close and Latch Rating: the maximum fault current a
circuit breaker can close into and successfully latch.
HSIOC: High Set Instantaneous Overcurrent, also known as
an instantaneous Override. A fixed instantaneous
function that operates if the breaker experiences a fault
exceeding its Short Time Rating (Icw).
I
n
: Trip Plug Rating in amperes. This is the current rating of
the rating plug installed in the trip unit. This is the
maximum Long Time pick up a trip unit can have with a
specific plug installed. A sensor can be applied with plugs
between 37.5% or 40% to 100% of the sensor rating. Plugs
are labeled in amperes.
I
cw
: Short Time Withstand Rating of a particular circuit
breaker in amperes. The withstand rating is defined
differently within different standards, but it is always the
value of current that a circuit breaker can withstand for the
maximum Short Time Delay before interrupting.
I
RMS
: True RMS current measurement through a phase
Making Current Release (MCR): This is an instantaneous
override that will trip the circuit breaker if it is closed into a
fault exceeding the breaker’s close and latch rating.
X: X is a multiplier that may be applied in front of any rating
value to denote a fraction of that rating. Ex: The Long Time
Pickup is may be set at 0.5X of In.
xl
CT
: Multiples of current sensor rating (non-dimensional)
GTU: Shorthand/abbreviation for EntelliGuard TU Trip Unit
GTU ORDER CODE
Below is the breakdown of what each column of the GTU
order code represents. For specific possibilities see
Appendix A: GTU Nomenclature. Also, find the Rating Plug
order code in Appendix B: Rating Plug Nomenclature.
Table 1-1: GTU Nomenclature
Order Code Representation
Digit 1 and 2 EntelliGuard Trip Unit Form
Digit 3 Frame Rating (Amperes) Short
Circuit/Withstand
Digit 4 and 5 Sensor Rating (Amperes)
Digit 6 and 7 Overcurrent and Ground Fault
Protection Packages
Digit 8 Zone Selective Interlocking
Digit 9 Advanced Features &
Communications
Digit 10 Manual/Auto Trip Reset
Digit 11 Original or Replacement Trip Unit
Digits 12, 13,
14, and 15 RESERVED (Future)
SETUP SOFTWARE
The EntelliGuard Setup Software provides a graphical user
interface (GUI) to configure and monitor the operation of
EntelliGuard Trip Unit functions. The software allows you to
save setting files offline to be loaded or compared with
current settings. It provides a means of creating
documentation regarding all the trip unit settings.
The software also provides a tool to extract and view
captured waveforms from EntelliGuard trip units equipped
with optional the Waveform Capture feature. This feature
also provides a means of determining harmonic content of
the power system.
The EntelliGuard Setup software is available at no charge
from either the GE EntelliGuard CD or the GE Industrial
Solutions web-site.
In on-line mode the tool is connected over communication
networks - Serial or Ethernet, you can communicate with
an EntelliGuard device in real-time.
In off-line (Disconnected) mode, a settings file can be
created for eventual downloading to the device.
Installing the Setup Software
The following minimum requirements must be met for the
EntelliGuard Setup software to operate on your computer.
System Requirements
• Microsoft Windows™ 2000/XP/Vista/7 is installed and
running properly.
• Minimum of 20 mb of hard disk space.
• Minimum 256 mb of RAM (512 mb recommended)
• RS-232 and/or Ethernet communication port.