GENER
AL
PR
ODUCT
OPER
A
TION
SCREEN
MODE
G
T-
HE
CURVES
INST
ALL
A
TION
C
ONNECTION
LOCKS
EntelliGuard G
INTRO
BREAKER
ACCESSORIES
TESTS
APPENDIX
TRIP UNIT
O
THER
2-34
2.4.1 GT-HE version additional setting options
To enable the options
described here the GT-HE
is provided with an extra
screen allowing the user
to choose number of Earth
Fault options. This screen
and the subsequent
setting screens replace
the equivalent GF sum &
GF CT screens.
2.4.1.1 UEF (Unrestricted Earth Fault)
The
UEF
option makes uses of the Ground Fault
sum. (Gfsum) principle.
When the Trip Unit is set to one of the options
indicating
UEF
both the current and time setting
range are identical to the Gfsum. ranges as
mentioned in section 2.2.3 of this manual.
Normally an OFF position is also provided.
However when used in combination with REF
and /or SEF this OFF is disabled.
2.4.1.2 SEF (Standby Earth Fault)
The
SEF
option makes use of the Ground Fault
current transformer (Gfct) principle. When the
Trip Unit is set to one of the options indicating
SEF
both the current and time setting range are
identical to the Gfct. ranges as mentioned in
section 2.2.3 of this manual.
When BOTH
UEF & SEF
are present and enabled
the SEF device cannot be set to a time lower
than that of the UEF s 0.1second or a
current setting lower than that of UEF.
™
2.4 EntelliGuard G Trip Unit GT-HE
(U.K. Earth fault variant)
User Guide for Trip Units type
GT-HE
(U.K. Earth fault variant)
Руководство по эксплуатации расцепителей
GT-HE
(U.K.)
Instrukcja obsługi wyzwalaczy
GT-HE
(tylko dla U.K.)
2.4.1.3
REF (Restricted Earth Fault)
The
REF
option makes use of the Ground Fault
current transformer (Gfct) principle. It is
programmed to use a differential in which the
current flowing to earth, measured by the CT is
compared to the vectorial sum of the current
flowing in the 3 phase lines or 3 phase plus
neutral lines measured by the breakers
Rogowski coils.
When the Trip Unit is set to an option indicating
REF
the current setting range is identical to the
GFct. range as mentioned n section 2.2.3 of
this manual. There is no time setting, only
Instantaneous being available. (60milliseconds).
2.4.1.4 Hardware Requirements
- EntelliGuard ACB plus GTU H trip unit type E
with the UEF, SEF & REF option installed.
AND
- Sensors in accordance with the chosen
options, breaker & network See below)
- A 24 V DC power supply.
Remarks
When the Rogowski sensor is mounted
externally it must be located downstream of the
Earth and Neutral connection. It needs to
capture the full neutral current)
It must be located in the direct vicinity of the
breaker (+10meters) with the current flowing in
the same direction as that in the breaker
sensors.
The Earth Leg Current Transformer must be
installed in the neutral to Earth link of the
installation and connected with 1 or 1.5 mm²
wiring. The distance to the breaker must be <=50
meters. The interposing CT is always supplied
breaker mounted.
Before connecting a Rogowski or Current
transformer REMOVE the existing link.
(Present to prevent issues when the terminals
are not in use)
Factory mounted EntelliGuard-G GT-HE Trip unit types
Cat. Number
6 digit
Opt.Nr. Description
GTG00NDX5SFXXXX
408755
51
EntelliGuard GT-HE LT+, SD, I, EF+,Met-Rel
GTG00NDT5SFXXXX
408750
52
EntelliGuard GT-HE LT+, SD, I, EF+,ZSI,Met-Rel
GTG00NFX5SFXXXX
408763
53
EntelliGuard GT-HE LT+, SD, I+, EF+ ,Met-Rel
GTG00NFT5SFXXXX
408758
54
EntelliGuard GT-HE LT+, SD, I+, EF+ ,ZSI,Met-Rel
GTG00NDX8SFXXXX
408756
55
EntelliGuard GT-HE LT+, SD, I, EF+,Met-Rel.Mbs.
GTG00NDT8SFXXXX
408751
56
EntelliGuard GT-HE LT+, SD, I, EF+,ZSI,Met-Rel.Mbs.
GTG00NFX8SFXXXX
408764
57
EntelliGuard GT-HE LT+, SD, I+, EF+ ,Met-Rel.Mbs.
GTG00NFT8SFXXXX
408759
58
EntelliGuard GT-HE LT+, SD, I+, EF+ ,ZSI,Met-Rel.Mbs.
GTG00NDX9SFXXXX
408757
59
EntelliGuard GT-HE LT+, SD, I, EF+,Met-Rel.Prbs.
GTG00NDT9SFXXXX
408753
60
EntelliGuard GT-HE LT+, SD, I, EF+,ZSI,Met-Rel.Prbs.
GTG00NFX9SFXXXX
408765
61
EntelliGuard GT-HE LT+, SD, I+, EF+ ,Met-Rel.Prbs.
GTG00NFT9SFXXXX
408761
62
EntelliGuard GT-HE LT+, SD, I+, EF+ ,ZSI,Met-Rel.Prbs.
These options are available on the
following trip unit types..
In all the above mentioned types the RELT option/ function can be disabled allowing the assignment of Relay
Output & Input one for other uses.
The Electronic trip units of the GT-HE series provide
long-time over-current protection (LT),
long-time delay (tr),
Short Circuit over-current protection (SD and/or I,
HI) and EarthFault Protection (GFsum & GFct).
This part of User guide covers the uses of
GFsum & GFct in the Unrestricted, Restricted and
Standby Earthfault (UEF, REF& SEF) applications.
To use the Trip Unit variants listed above and
described and elsewhere in this document the use
of a GE approved 24 VDC power supply required.
All mentioned factory mounted trip Units are
supplied with a breaker mounted Interposing CT.
1. OFF
1. OFF
2. UEF
3. UEF + SEF
4. UEF + REF
5. UEF + SEF + REF
6. SEF + REF
EntelliGuard Breaker
with GT-HE series Trip Unit
S
tandby Ear
th Fault (
SEF
)
Restricted
Ear
th Fault (
REF
)
Unr
estricted
Ear
th Fault (
UEF
)
FIG. : Earth fault protection zone diagram
4 wire
(3 phase
plus
neutral)
Network
3 wire
(3 phase)
UEF+SEF+REF
SEF +REF
Breaker nr of Poles
4th Rog.
UEF
UEF+SEF
UEF +REF
4
3
4
3
Interpos. CT
Earth Leg CT
Interpos. CT
Earth Leg CT
Interpos. CT
Earth Leg CT
4th Rogowski
Interpos. CT
Earth Leg CT
Interpos. CT
Earth Leg CT
Interpos. CT
Earth Leg CT
Interpos. CT
Earth Leg CT
4th Rogowski
Interpos. CT
Earth Leg CT
Interpos. CT
Earth Leg CT
Interpos. CT
Earth Leg CT
Interpos. CT
Earth Leg CT
4th Rogowski
Interpos. CT
Earth Leg CT
Interpos. CT
Earth Leg CT
Interpos. CT
Earth Leg CT
Interpos. CT
Earth Leg CT
4th Rogowski
Interpos. CT
Earth Leg CT
Russian see page 2-38 | Polish see page 2-42