Earth / Ground Testers
UNILAP GEO / GEO X
UNILAP GEO
Automatic determination of auxiliary earth electrode- and probe-
resistance
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Displays all measuring results for as long as desired
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Programmable LIMITS - optical and acoustical warning at limit
infringement
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Long battery service-life because of short-time-measuring method
and automatic switch-off
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Operator quick reference on rear of instrument
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Splashproof case IP56 (outdoor application)
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Developed, designed and manufactured as per DIN ISO 9001
UNILAP GEO X
Additionally:
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Measurements with current clamps: Selective, stakeless
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Resistance measurements with 250mA short circuit current
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Output of measured values via interface on printer or PC
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Measuring protocol via PC-software
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Description
At the locations involving the generation, distribution and consumption
of electrical energy, certain safety measures must be met in order to
protect human life. In many cases, these
safety measures
are
national and international regulations which must be checked regularly.
Earthing,
the connection of exposed conductive parts to the earth in
case of a fault, represents the most fundamental safety measure.
Real life requires the earthing of transformers, high and medium voltage
power pylons, railway tracks, tanks, vats, foundations and lightning
protection systems. Large fields of applications, the seasonal variations
of the earth resistance, variations from weather and ground conditions,
require test instrument able to collect and document additional
information in order to ensure that the conditions under which the
measurement was taken are known and that the results are
reproducible. Finally, the device must provide all of this information
reliably with the greatest possible simplicity and ease of use.
The
UNILAP GEO
and
UNILAP GEO X
provide the
perfect solution
by combining the latest technology and years of LEM experience into
a compact, field-rugged and extremely easy to use instrument. In
addition to performing standard 3- and 4-pole earth resistance
measurements, an innovative process accurately measures individual
earth electrode resistances in single and meshed earthed systems
without disconnecting any parallel electrodes!
One specific
application of this capability is quick and accurate measurement of
power pylon grounds. The
UNILAP GEO (X)
also incorporates the
first truly automatic frequency control (AFC) to minimise interference.
Before measuring, the instruments identify existing interference and
select a measurement frequency to minimise its effect. The
UNILAP
GEO (X)
incorporates microprocessor controlled automatic
measurements including checking probe hookup to ensure
measurements are
taken correctly and measuring
all probe ground
resistances to ensure reliable, repeatable results. Probe resistance
and auxiliary earth resistance are also measured and displayed. All
measured data, as well as the time-of-day the measurement was
taken, can be sent to computer or directly to the retrofitable DOCU-
PACK with built-in memory, printer and RS232 interface.
In real life situations this means:
- Select function
- Press START button
- Read measured value
UNILAP GEO and UNILAP GEO X also offer extra features:
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Earthing resistance 3-pole and 4-pole of 0.001W...300kW,
with voltages of 20 V/48 V AC,
with frequencies of 94, 105, 111, 128 Hz or AFC (Automatic
Frequency Control), with automatic test of test lead connection
and adjustable limit values
Resistance 2-pole AC 0.001W...300 kW
Noise voltage up to 50 V, noise frequency
Measurement of the earthing impedance of electricity pylons
UNILAP GEO X additionally offers:
Selective measurement of individual earth electrode
resistance in interlinked or parallel ground systems (i.e.
power pylons, grounding grids, lightning protection
systems) without influence from other grounds.
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Low resistance 2- and 4-pole 0.001
W...3
kW with automatic polarity
reversing and high short-circuit current as per IEC 61557-4
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Display illumination
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Serial interface (RS 232, optional)
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Option DOCU-PACK: memory, printer, interface
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PC-Software WINGEO as an option
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