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Application
The earth fault indicator type TERRA operates in medium
voltage radial networks with only one input. The sum current of the conductors L1, L2 and L3 will be measured.
(The instrument is preferably applied in resistance-earthed or solidly earthed neutral systems).
The earth fault indicator should be installed in each branch of the system. |
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General Description
The earth fault indicator type TERRA consists of a reading instrument (1), a sensor (2) including
the connection cables (4).
The reading instrument is available either as a panel-mounted instrument or as a surface-mounted instrument.
Every version is available with manual reset or with reset
by recovering voltage 230 V AC. Each version can be
delivered with up to three operating currents, which can
be selected on site. |
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Version 1
This version of TERRA requires the connection of 230VAC for its indication function.
The operating currents are adjustable from 10 A upwards.
The indication can be reset in the following ways:
1) manually via a magnet system in the instrument
2) automatically via the recovering volatge 115/230 VAC of the switchgear
For the detection of earth fault the S-sensor will be applied.
Version 3
This version of TERRA does not require any auxiliary power supply for responding to an earth fault.
The power for indicating is directly gained from the P-Sensor.
The operating currents are adjustable from 25 A upwards.
The indication can be reset in the following ways:
1) manually via a magnet system in the instrument
2) automatically via the recovering volatge 115/230 VAC of the switchgear
Every indicator can be supplied with a contact for remote indication.
The S-sensor consists of a black plastic housing with a coil inside. The housing is fully sealed (IP 67). The sensor if fixed
on the conductor with a cable tie. The earth fault is detected with the help of a steel belt made of laminated steel.
The connection to the reading instrument is done via cable (standard length: 3000 mm).
The P-sensor consists of a laminated steel belt, and the coil is directly wrapped on this belt. The sensor is fixed on
the high voltage conductor with the help of two plastic cable ties.
The connection to the reading instrument is done via cable (standard length: 3000 mm).
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Order Data
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Earth Fault Indicator TERRA
operating current |
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1st value: (A) ______
2nd value: (A) ______
3rd value: (A) ______
4rd value: (A) ______ |
Power supply (V): 110/230 V AC
Sensor: conductor diameter: _____
Cable length (mm):
(standard- 3000 mm) _____________
Order-No.:____________________ |
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Order-No. of Earth Fault Indicator Type TERRA |
version |
TERRA-E
(panel mounted) |
TERRA-A
(surface mounted) |
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version |
reset |
without
remote indication |
with remote
indicationt |
without
remote indication |
with remote
indication |
1 |
manual |
26.06.01 |
26.07.01 |
26.08.01 |
26.09.01 |
automatic |
26.06.02 |
26.06.02 |
26.08.02 |
26.09.02 |
3 |
manual |
26.14.01 |
26.15.01 |
26.16.01 |
26.17.01 |
automatic |
26.14.03 |
26.15.03 |
26.16.03 |
26.16.03 |
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