Megger MIT510-2, MIT1020-2 Data sheet
MIT510/2, MIT520/2 and MIT1020/2
5-kV and 10-kV Insulation Resistance Testers
MIT510/2, MIT520/2 and MIT1020/2
5-kV and 10-kV Insulation Resistance Testers
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Line supply or battery operated
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Digital/analog backlit display
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Measurement range to 15 TΩ (MIT510/2
and MIT520/2) and 35 TΩ (MIT1020/2)
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CAT IV 600 V safety rating
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Automatic dielectric absorption ratio,
polarization index, step voltage, and
dielectric discharge tests (MIT520/2 and
MIT1020/2)
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RS232 or USB download of results
(MIT520/2 and MIT1020/2)
DESCRIPTION
The new MIT510/2 and 520/2, 5-kV and MIT1020/2, 10-kV
insulation resistance testers are all designed specifically to
assist the user with the testing and maintenance of high
voltage equipment. The instruments are designed in a
landscape style which is more familiar and user friendly.
The MIT510/2 and MIT520/2 measures to 15 TΩ, replacing
the ambiguous “infinity” reading with an actual number
that can be used for predictive/preventive trending on the
highest quality insulation. Both units are supplied with test
leads with medium insulated clips.
The MIT510/2 has the facility to set the test voltage in steps
from 250 V to 5000 V and the MIT520/2 has the ability
to set the test voltage from 50 V to the maximum output
voltage.
The MIT1020/2 offers a measurement range to 35 TΩ in
order to provide trending values for the best of insulating
materials used on the higher capitalized equipment. The
model features an expanded test voltage range from 50 V
to 10 kV, in 10 V increments to 1 kV and 25 V increments
above. The MIT1020/2 is supplied with two sets of test
leads, one with medium insulated clips and the other with
large insulated clips.
All three instruments have a large, easy-to-read backlit
LCD making them equally suitable for use in both bright
sunlight and poorly lit environments. Information displayed
includes resistance, voltage, leakage current, capacitance,
battery status and time constant. In addition, the elapsed
time is displayed constantly, removing the need for
separate timers. The MIT520/2 and MIT1020/2 allow up to
3 timed measurement positions to be set, which simplifies
DAR testing.
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Ingress protection to IP65
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3 mA short circuit current
A built-in integral timer starts automatically at the beginning
of a test, and displays in minutes and seconds. At the end
of any test, capacitive loads are automatically discharged
and the decaying voltage displayed. The timer enables the
performance of an automatic IR test with the MIT510/2,
while the MIT520/2 and MIT1020/2 add the capability of
preprogrammed DAR, PI, SV and DD. The MIT520/2 and
MIT1020/2 include a selectable breakdown or burn mode
and an alarm mode, which allows the operator to preset a
specific resistance level. The unit will beep until the limit
is exceeded. The controls of the instruments are clear and
unambiguous, and a “quick start” guide is included in the
lid, eliminating the need to carry manuals to site locations.
Redundant safety features make the instruments fully
amenable to safe operation in the more demanding high
voltage environment. The CAT IV 600 V safety rating
means that the instruments are protected for use on outside
applications and are protected against impulses to 8 kV.
Instrument design is in conformance with EN61010 for
arc-flash protection. If the instrument is accidentally
connected to a live test item, external voltage will be
automatically displayed and testing inhibited above
50 V (80 V on MIT1020/2). At the conclusion of a test,
dangerous static voltage on the test item is automatically
discharged and monitored on the display. All three models
are fitted with a guard terminal to enhance accuracy.
The guard test lead is included as standard with each
instrument.
MIT510/2, MIT520/2 and MIT1020/2
5-kV and 10-kV Insulation Resistance Testers
APPLICATIONS
All three models are designed for testing the insulation
of high-voltage electric equipment. Their wide voltage
range also allows applications for low-voltage equipment.
Generators, motors, transformers, cables and switchgear all
require effective maintenance. The test techniques on the
instruments provide valuable diagnostic information.
All three instruments test the insulation resistance of:
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High-voltage power cables and high-voltage buses
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Large motor/generator windings
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Line and substation transformers
The MIT520/2 and MIT1020/2 also perform spot tests,
step-voltage tests, dielectric discharge tests and dielectric
absorption tests for the following applications:
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Acceptance testing at installation to check conformance
to specifications.
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Routine preventive/predictive maintenance testing after
installation.
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Quality assurance testing as part of the manufacturing
process.
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Diagnostic testing to isolate faulty components for repair.
With its higher voltage testing capability, the MIT1020/2
is the perfect every day work tool for manufacturers,
users and maintainers of rotating machinery. Designed
in accordance with the requirements of IEEE43:2000 the
MIT1020/2 is ideal for measuring the insulation resistance
of armature and field windings in rotating machines
rated 1hp (750 W) or greater. The standard applies to
synchronous, induction and dc machines as well as
synchronous condensers.
FEATURES AND BENEFITS
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CAT IV 600 V safety rating allows for safe use in the
widest range of applications.
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Improved operating flexility provides the user with the
choice of using these instruments via line or battery
operation. Line operation also affords enhanced charging
capabilities for high-capacitance test samples.
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High measurement range enables installation testing and
long-term trending of higher value apparatus.
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3 mA short circuit current allows for faster charging and
testing of large capacitive and inductive loads.
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Results storage and downloading enables state-of-the-art
record keeping free of transposition errors.
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Five industry-standard tests can be performed
automatically, freeing operator from time-consuming
manual operations.
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Backlit display enables ease of testing in poorly lit areas.
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Rugged, lightweight polypropylene case and IP65 rating
make all of the instruments adaptable for all field
conditions.
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A variety of measurements including applied test voltage,
leakage current and capacitance, affords enhanced
capabilities to diagnose insulation condition and
problems.
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Redundant safety features includes automatic discharge of
test item, test inhibition in presence of external voltage,
and design to EN61010.
The MIT1020/2 in use at an industrial complex
substation
Delta wye transformer being testing with a MIT520/2
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