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Power Transformer Testing
Multifunction Test Systems
Multifunction test system for transformers and substations TRAX series
■ Power transformers
■ Load tap-changers
■ Reactors
■ Instrument transformers
■ Bushings
■ Circuit-breakers
■ Grounding systems
■ Load tap-changers
■ Reactors
■ Instrument transformers
■ Bushings
■ Circuit-breakers
■ Grounding systems
2000 A current accessory for TRAX TCX 200
When the high-current output of TRAX 200/219 (max 200 A) or
TRAX 280/279 (max 800 A) is not sufficient, the optional accessory TCX offers
currents up to 2000 A. Because it is small, the TCX unit can be placed
close to the test object, thus reducing the need for long heavy
current cables.
Tan delta and capacitance accessory for TRAX TDX 120
With the use of the TDX accessory, the TRAX becomes a fully
automatic 12 kV tan delta or power factor test set for the condition
assessment of electrical insulation in high voltage apparatus.
3-phase switch accessories for TRAX TSX 300 and TSX 303
TSX 300 offers manual
switching of phase under test.
Meanwhile the TSX 303 allows
the operator automatically test
all windings and taps with the
single climb and connection
Test van for maintenance and diagnostic testing of power transformers
■ Software control and reporting
■ High voltage and low voltage leads are shared among different instruments
■ DC Winding resistance / Tap Changer Test
■ Turns ratio and vector group verification
■ Capacitance and dissipation factor / power factor
■ Excitation current
■ Insulation Resistance
■ High voltage and low voltage leads are shared among different instruments
■ DC Winding resistance / Tap Changer Test
■ Turns ratio and vector group verification
■ Capacitance and dissipation factor / power factor
■ Excitation current
■ Insulation Resistance
5 kV diagnostic insulation resistance tester MIT525
The MIT525 performs all the insulation tests offered by MIT515 and
extends the testing capabilities to include Step Voltage, Dielectric
Discharge and ramp testing. Test data can be downloaded in realtime using the 10 kV isolated USB port, or stored in the instrument’s
advanced memory. Smaller and lighter than its predecessors these
new testers are easier to store on a van, fit in an overhead locker on
an aircraft and are more convenient to carry to the job.
Tan Delta Test System
Tan delta test system DELTA4000
The DELTA4000 Series is a fully automatic 12 kV insulation power factor/dissipation factor
(tan delta) test set designed for condition assessment of electrical insulation in high voltage
apparatus such as transformers, bushings, circuit breakers, cables, lightning arresters and
rotating machinery. In addition to performing insulation power factor tests, the DELTA4000
Series can be used to measure the excitation current of transformer windings as well as
to perform automatic tip-up tests and HV turns-ratio testing (an optional TTR capacitor is
available).
Capacitance and dissipation factor bridge CDAX605
CDAX605 can be used as part of a customised tan delta solution with an external power source
or generator. It is a precision instrument using a combination of bridge and direct (vector)
measurements and is capable of measuring capacitive, resistive and inductive loads.
CDAX605 is designed for laboratory, production line or field testing of electrical equipment
insulation and insulating materials as well as e.g. calibration of CCVTs and other ratio devices
Single-phase turns ratio testers TTR100-1
The latest TTR available from Megger is the TTR100-1, a handheld, robust, lightweight and battery operated
instrument. This TTR will complement several existing Megger transformer test products and will offer functions,
such as winding resistance and polarity. These functions, as well as the phase angle measurement function, can
be switched off when not required. With a turn ratio of 20,000:1, the TTR100-1 offers the highest turns ratio
accuracy in the industry of 0.1%. The TTR100-1 features special software capabilities.
CT Testers
True 3-phase turns ratiometer TTRU3
The NEW Megger TTRU3 transformer turns ratiometer uses a
revolutionary design to perform a complete series of measurements
on a transformer, including 3Ø step up turns ratio testing (patent
pending). 3Ø voltage output offers numerous advantages to testing
with today’s busy schedules.
The TTRU3 is an important tool for determining the mechanical
condition of transformers
Step-up transformer MAGNUS
MAGNUS permits the preparation of excitation curves for CTs,
to demagnetize their cores and turns ratio tests on voltage
transformers. It can deliver 1 A at 2.2 kV. for rapid testing.
Current transformer tester MRCT
This tough, portable unit is used to perform demagnetization,
ratio, saturation, winding resistance, polarity, phase deviation,
and insulation tests on current transformers. The MRCT
automatically calculates ratio errors,
saturation curves, and knee points.
The MRCT provides
automatic testing
of single and
multi ratio CTs,
reducing testing
time and increasing
productivity. The
MRCT will directly connect to multi
ratio CT’s and perform all tests – saturation, ratio and polarity,
winding resistance and insulation – on all taps with the push of
a button and without changing leads
Current transformer and Voltage transformer tester MCVT
The MVCT test set is a lightweight,
robust, portable unit capable of
testing both current and voltage
transformers. At less than 20 lb
(10Kg) the MVCT is a highly portable
unit that also offers accuracy in
testing. Capable of performing
saturation, ratio, polarity, winding
resistance, and insulation tests on
current transformers, it can also
be used for testing metering and
protection class voltage/potential transformers.
Turns Ratio Systems, TTR
True 3-phase turns ratiometer TTRU3
The NEW Megger TTRU3 transformer turns ratiometer uses a
revolutionary design to perform a complete series of measurements
on a transformer, including 3Ø step up turns ratio testing (patent
pending). 3Ø voltage output offers numerous advantages to testing
with today’s busy schedules.
The TTRU3 is an important tool for determining the mechanical
condition of transformers
Transformer Ohmmeters
Automated six-winding transformer ohmmeter MTO300 and MTO330
The MTO300 series
saves time by testing
all six windings without
having to disconnect and
reconnect leads; combined
with the simultaneous
winding magnetization
method this gives fast and
reliable measurements
even on large transformers
with delta configuration on the low voltage side. A built-in circuit
restores the transformer core to a demagnetised state after testing,
before being returned to service or can be used to prepare the
transformer for SFRA.
6 A two winding transformer ohmmeter MTO106
The MTO106 transformer
ohmmeter is an easy-to-use, lineoperated instrument specifically
designed for safe and accurate
field measurement of winding
resistance in smaller transmission
and distribution transformers. It
has dual channels with max 6 A
current output. It’s measurement
range and accuracy suited to
provide accurate information
about the vast majority of
power transformers, reactors and instrument transformers. The
test current can be manually set in five different ranges to fit
transformers of various sizes.
10 A two winding transformer ohmmeter MTO210
A two channel transformer
ohmmeter MTO210 outputs
a dc test current of up to
10 A. With a range from
1 µΩ to 2 kΩ, it offers a
measurement accuracy of
0.25 %. Test results can
be stored on board and
downloaded for analysis. A built-in circuit restores the transformer
core to a demagnetised state after testing, before being returned
to service or can be used to prepare the transformer for SFRA. The
high speed discharge circuit protects the operator.
50 A two winding transformer ohmmeter MTO250
Designed for larger transformers up to 1000 MVA, MTO250, 2
channel transformer ohmmeter, outputs a test current up to 50 A.
This makes the testing of larger transformers significantly faster.
It can be used to assess the performance of make-before-break
transitions in load tap changers too. Test results can be stored on
board and downloaded for analysis. A built-in circuit restores the
transformer core to a demagnetised state after testing, before
being returned to service or can be used to prepare the transformer
for SFRA. The high speed discharge circuit protects the operator.
3-phase ratio and winding resistance analyser MWA300 series
The MWA 300 transformer winding analyser is an advanced test
system that can test all sizes and types of transformer, with and
without OLTC tap changers. It delivers greater productivity due to
its portability and by reduced set up time. The MWA will perform
the following tests: ratio, phase deviation, polarity, excitation
current, winding resistance, demagnetization, and make/break
transition monitoring. Built to test transformers in the harshest of
environments, the MWA performs well in high noise conditions.
Transformer Insulation Oil Testing
Oil is an efficient coolant with a high flash point and high dielectric strength when used as an insulator in transformers. The insulation properties can change due to oxidation, acids, sludge, gas and water absorption. These changes can be monitored using a dielectric Megger oil test set.
60 kV, 80 kV and 100 kV automatic laboratory oil test sets OTS60AF, OTS80AF and OTS100AF
Designed for Laboratory use, these instruments measure the
dielectric strength of mineral, ester and silicon insulating oils.
With re-thought out ergonomics, the vessels and chambers
are particularly easy to drain and clean out. The screw adjusted
electrodes have a unique mechanism to lock precisely the electrode
gap. The detection circuit offers direct measurement of both
voltage and current and the system has an ultra fast HV switch off
time of less than 10 μs to reduce oil deterioration.
Oil tan delta test set OTD
A new addition to the comprehensive range of Megger Oil Test Sets,
the OTD measures Tan Delta, resistivity and relative permittivity of
insulating oils. As well as international set of standards, the OTD
supports up to six customer configurable test sequences.
Productivity in the laboratory is maximised, with the focus on
reducing the test cycle time by fan cooling and inductive heating,
together with an oil drain facility, negating the need to move the
oil vessel.
Variable specific gravity moisture in oil test set KF-LAB
Easy to use test set that titrates
for specific gravities between 0.60
and 1.40. Designed specifically for
laboratory use, the KF-LAB is mains
powered only.
Portable moisture in insulating oil test set KF875
Optimised for oils with an SG of 0.875, the KF875 is easy to use,
portable one button test set with integral printer. Can be powered
from mains, internal rechargeable battery or car battery. Ideal for
on site use.
60 kV and 80 kV portable automatic oil test sets OTS60PB and OTS80PB
Weighing in at only 16 kg the OTS60PB is the lightest, most portable oil test set available. Meanwhile the
OTS80PB is the most flexible test set because it offers more power in a test set which weighs less than
21 kg. Featuring the same easy-empty vessel and quick-drain chamber design as the laboratory
models, the large, bright, colour screens are easy to read in sun light. Features like the electrode
precision lock and ultra fast HV switch off time are particularly important for instruments that may
not be used in the ideal environment. The OTSPBs can be configured to match the users needs.
60 kV manual oil test set.
60 kV semi automatic oil test set OTS60SX
Light semi-automatic 60 kV oil dielectric strength test set which is
simple to use and can be powered from a range of mains supplies.
Digital voltage checker for oil test sets up to 80 kV and 100 kV VCM80D and VCM100D
Designed for checking the output voltage of the OTS AF and OTS
PB test sets, these checkers show the output voltage in digital read
out and this can be compared with the instrument reading.
OTS super-user kit
Offer 2 sizes of test chamber
and a selection of electrode and
impeller types.
Dielectric Frequency Response Analysers
Frequency Response Analysis (FRA) applies a variable signal to the transformer and monitors its response. This can be compared to a reference which can reveal a wide range of faults. Dielectric Frequency Response (DFR) also known as FDS (Frequency domain spectroscopy) is the most powerful tool for assessing the moisture in the oil and cellulose components of power transformers. Because it scans the dielectric losses in the system across a spectrum of frequencies and then compares them to a modelled curve, results are independent of temperature.
Sweep frequency response analyser controlled by PC FRAX101
■ Highest accuracy and dynamic range in the
industry
■ Complies with and exceeds international standards for sweep frequency measurements
■ Smallest and most rugged sweep frequency analyser on the market
■ Extensive file import-export capabilities including CIGRE and xml formats
■ Complies with and exceeds international standards for sweep frequency measurements
■ Smallest and most rugged sweep frequency analyser on the market
■ Extensive file import-export capabilities including CIGRE and xml formats
Sweep frequency response analyser FRAX150
Like FRAX101 the FRAX150 offers all the benefits of SFRA for
diagnosis of damage to transformers, but it is built into a tough
carry case which includes an on-board computer making it even
more transportable. There is a large bright screen to make it
comfortable to use even in bright sun light. Data can be stored
on the hard-drive and can be downloaded using the galvanically
isolated USB port.
Insulation diagnostic analyser IDAX300, IDAX350 and IDAX322
■ State-of-the-art measurement of moisture content,
tan delta / power factor and oil conductivity using
DFR (Dielectric Frequency Response)
■ Easy-to-use: Software with automated measurement flow and analysis of test results “Traffic light” interpretation of test results
■ Dedicated test procedures for power transformers, bushings and current transformers
■ Automated individual temperature correction (ITC) for accurate comparison with reference data/tests
■ Easy-to-use: Software with automated measurement flow and analysis of test results “Traffic light” interpretation of test results
■ Dedicated test procedures for power transformers, bushings and current transformers
■ Automated individual temperature correction (ITC) for accurate comparison with reference data/tests
High voltage amplifier for IDAX300 and IDAX350 VAX020
■ True and proven DFR/FDS technology for highest
performance
■ High voltage amplifier enables IDAX measurements at 2 kV test voltage
■ Large frequency range, DC to 1 kHz
■ Compact design, weight only 4.4 k
■ High voltage amplifier enables IDAX measurements at 2 kV test voltage
■ Large frequency range, DC to 1 kHz
■ Compact design, weight only 4.4 k