Atec mct1605 User Manual

MCT1605

Multi-Tap Automatic Current Transformer Saturation,

Ratio and Polarity Test Set

MCT1605

Multi-Tap Automatic Current Transformer
Saturation, Ratio and Polarity Test Set

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One button automated test: Demagnetization,

on multi-ratio CTs test all Knee Point,
Saturation, Polarity and Deviation, Winding
Resistance, Insulation Resistance, and Burden

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Displays multiple instantaneous Saturation

Curves with Knee Point

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Integrated 1 kV DC insulation test system

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Color daylight viewable graphical display

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“Save & Print Later” with USB stick

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Fast data entry using full QWERTY keyboard

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1600 VAC Saturation Test Voltage

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Automatic or manual testing selectable

DESCRIPTION

The Megger MCT1605 test set is a lightweight, robust,
portable unit used to automatically or manually perform
saturation, ratio, polarity, demagnetizing tests and
insulation tests on current transformers. The MCT provides
a microprocessor controlled variable voltage output
and precision instrumentation for automatically testing
single and multi-ratio CTs. The MCT1605 possesses
microprocessor controlled output voltage with precision
instrumentation and storage, reducing testing time and
increasing productivity. The MCT1605 will directly connect
to multi ratio CT’s and perform all three tests – saturation,
ratio and polarity – on all taps with the push of a button
and without changing leads. The MCT1605 has a large
display, permitting the user to easily read all pertinent data
while the test is being performed and providing the ability
to view the current transformer’s saturation curve.

Current transformers can be tested in their equipment
configuration, such as being mounted in transformers,
oil circuit breakers or switchgear. It is necessary for the
equipment to be completely isolated from the electrical
system prior to testing.

APPLICATIONS

Saturation Test

With the single push of a button, The MCT1605 performs a
CT saturation test and calculates the rated knee point. The
saturation test is performed at mains rated frequency of
50 or 60 Hz as required by IEC regulations. The MCT1605
will calculate the rated knee point in compliance with
IEEE C57.13.1, IEC 60044-1 or IEC 60044-6. While the
saturation test is being performed, The MCT will plot the

CT saturation curve on the large graphical display and
automatically provide the user with the rated knee point
per the desired IEEE or IEC standard. Many substation
CT’s include a multi-ratio secondary, therefore the
MCT1605 has the ability to plot and simultaneously display
up to 10 CT saturation curves.

Ratio Test

Ratio testing is performed by comparing a voltage applied
to the secondary winding to the resulting voltage produced
on the primary winding. For example, if 1 volt per turn is
applied to the secondary winding, the voltage present on
the primary winding would be 1 volt. More specifically, if
120 volts were applied to the secondary of a 600/5 current
transformer (120:1 ratio), 1 volt would be present on the
primary winding. This test is performed automatically
during a CT saturation test or manually with the output
control knob and metering display. The MCT1605 will
also provide the operator with a direct reading ratio, thus
removing the need to calculate CT ratio manually.

Polarity Test

Polarity of the current transformer under test is indicated to
the operator by a simple “Correct” or “Incorrect” indication
on the display accompanied by the measured phase angle.

Demagnetization

Normal operating conditions and typical winding resistance
measurements can cause a CT to become magnetized. The
MCT1605 has the ability to automatically demagnetize the
CT under test. This automatic demagnetization routine is
useful to ensure that the CT Saturation test yield correct
results. Prior to testing demagnification is recommended
per ANSI C57.13.1.

MCT1605

Multi-Tap Automatic Current Transformer Saturation,

Ratio and Polarity Test Set

CT Burden Measurement

In addition to performing any required CT test, the
MCT1605 has the ability to measure the actual connected
Burden. When the actual measured burden is compared
against the calculated burden, the user confirms that the CT
will operate with published rating.

Insulation Resistance Test

In order to ensure that the CT secondary wiring is properly
insulated, the MCT1605 system includes a 500/1000V
insulation resistance test system. This test ensures that the
CT secondary winding and secondary wiring is properly
insulated per ANSI C57.13.1.

The MCT1605 will also automatically switch the test leads
to perform all required insulation test. These test include
H-L, H-G, L-G

Note: Disconnect all electronic loads before performing this
test.

Winding Resistance

Measuring the DC resistance of transformer windings
will aid in identifying problems such as shorted or open
windings as well as loose connections.

Data Storage and Printing

The MCT1605 test system not only permits accurate and
automated CT testing, but also catalogues and stores
test results within the instrument for simple retrieval by
software at a later date. All catalogued test results can be
uploaded to Megger’s PowerDB

TM

Lite for report generation
and saturation curve plotting on a computer. PowerDB
Lite also has the ability to operate the MCT1605 with
no operator intervention, thus providing a completely
computer controlled automated test system.

Complete report generation with PowerDb Lite

The operator also has the option to print any catalogued
test results immediately using an optional printer, providing
hard copy of test reports immediately upon CT test
completion.

Onboard memory allows complete test results and data to
be stored in one complete file, permitting easy access to
quick construction of reports such as saturation curve with
knee point. The MCT1605 test file is saved in a Microsoft
XML format, thus the data is available to any application
that will accept an XML format.

With a manual voltage
output control knob, the
user is able to perform
any test required manually
if only a spot check is
required.