Atec MRCT User Manual

Megger Relay and Current Transformer Test Set

MRCT

Megger Relay and Current Transformer Test Set

 Industry leading test duration using patented

simultaneous multi-tap measurements reduces
testing time by 20% on multi-tap CT’s

 Increased measurement accuracy to support

metering class CT testing

 Smallest and lightest 2 kV secondary voltage

injection unit on the market

 Integrated single phase relay test system

 General purpose substation secondary circuit

testing with 300 V & 60 A generators

 Grouped testing: demagnetization, knee

points, ratios, saturation curves, and more

 Measure all ratio’s and saturation curves on

multi-tap CT’s with one lead connection

 Built-in insulation resistance testing

MRCT

DESCRIPTION

The Megger MRCT is a light weight, robust, portable unit
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 a
microprocessor-controlled variable voltage and current output and
precision instrumentation for automatically testing 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.

The MRCT can be controlled
via Megger’s Smart Touch
View Interface (STVI)
controller. The STVI controller
is a full color, high resolution,
LCD touch screen which
allows the user to perform
manual and automatic testing
quickly and easily using the
manual test screen, as well
as using pre-constructed
test routines. The large color
display permits the user to easily read all pertinent data while the
test is being performed and provides the ability to view the current
transformer’s saturation curve. The unit can also be configured to
come without a Megger STVI and can be controlled via a laptop
with Megger’s PowerDB software.

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
MRCT performs a
CT saturation test
and calculates the
rated knee point. The
saturation test can be
performed at frequency
of 50 or 60 Hz up to
2,000 volts as required
by IEC regulations.

The MRCT will calculate the rated knee point in compliance with
IEEE C57.13.1, IEC 60044-1 or IEC 60044-6 on both standards as
well as of specialized CTs such as PX, TPS, TPX, TPY and TPZ. While
the saturation test is being performed, the MCRT will plot the CT
saturation curve on the STVI display and automatically provide the
user with the rated knee point per the desired IEEE or IEC standard.
Many substations CTs include a multi-ratio secondary; therefore the
MRCT has the ability to plot and simultaneously display up to 10 CT
saturation curves.

Ratio, Polarity Test

Ratio testing can be performed by using the MRCT. The method
used by the MRCT compares 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.

Winding Resistance Test

Measures CT winding resistance with the injection of a test
voltage, measuring the DC current and calculating temperature
compensated resistance.

Demagnetization

Normal operating conditions and typical winding resistance
measurements can cause a CT to become magnetized. The MRCT
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 demagnetization
is recommended per ANSI C57.13.1.

CT Burden

The MRCT measures the connected CT burden load with direct
injection of secondary current to a load that is disconnected from
the CT. The MRCT measures the secondary voltage in magnitude
and angle of the connected burden in VA and power factor.

Insulation Resistance Test

In order to ensure that the CT secondary wiring is properly insulated,
the MRCT system includes a 500 V, 1,000 V insulation resistance
test system. This test ensures that the CT secondary winding and
secondary wiring is properly insulated per ANSI C57.13.1.

The MRCT 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.

Data Storage and Printing

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

TM

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

Upgradeability

The MRCT includes the ability to upgrade testing capability. With
various configurations and accessories the MRCT system can be
upgraded as new testing needs are developed.

FEATURES AND BENEFITS

 Industry leading test duration using patented simultaneous

multi tap measurements - The MRCT system can provide
concurrent measurement of voltages on all taps during CT
saturation, and ratio and polarity testing. This allows the MRCT
system to calculate the knee points and ratios of all windings at
the same time thus eliminating the need for multiple tests on a
CT. This will drastically reduce testing time.

MRCT

Megger Relay and Current Transformer Test Set

The MRCT is available in 2 onboard display/enclosure options.

 Automated Test Plans with CT Saturation, Ratio and

Polarity, Winding Resistance and Insulation Testing - The
microprocessor controlled output fully automates testing of CTs.
The MRCT will directly connect to multi ratio CTs 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.

 Direct Connection to Multi Ratio CTs - The MRCT will directly

connect to all taps on multi ratio CTs to eliminate lead changes
required to test all inner-winding CT ratios, saturation curves and
knee points. The MRCT will test all programmed taps with the
push of one button.

 Full Color, High Resolution, LCD Touch Screen - Menu screens

and touch screen function buttons are provided to quickly and
easily select the desired test function. Tests results can be saved
to the unit for download to a memory stick to transfer or print
test reports.

 CT Saturation, Ratio and Polarity, Winding Resistance, and

Insulation Automated Testing - The microprocessor-controlled
output fully automates testing of CTs. This automated testing
simplifies CT testing and reduces testing time. Automated testing
is accomplished directly on the Megger’s STVI or via PowerDB
Lite.

 CT Demagnetization - During operation and routine

DC winding resistance testing, it is possible for a CT to
become magnetized. The MRCT includes an automated CT
demagnetization function, which allows determination of
accurate knee point and ratios thus providing stable, repeatable
test results, and reduces test time.

 Insulation Test - The MRCT includes a 500/1,000 V insulation

test system to verify the CT secondary winding and secondary
wiring. This insures that the secondary insulation has not
degraded and will continue to perform its function during high
current faults.

 Test Result Report - The MRCT offers storage of complete test

files in an easy-to-use, versatile format that permits upload to
PowerDB Lite, or printing test results using the optional external
printer. These options provide a simple, complete, easy way to
store over 200 test results and saturation curves. All test results
can be cataloged and stored in the MRCT.

MRCT

Megger Relay and Current Transformer Test Set

SPECIFICATIONS

Input

Output

Voltage Continuously variable in three ranges:

Current

Output Current Power Max V/Duty Cycle

30 Amperes 200 VA (282 peak) 6.67 V rms

60 Amperes 600 VA 90 cycles

Instrumentation

Voltmeters

Output

Resolution 0.0000 to 1.9999/19.999/199.99/1999.9

Ranges 0 to 2/20/200/2000 V

Accuracy ±0.5% of reading typical

Input

Primary Voltage
Measurement

Ranges 0 to 0.35/2.0/20.0/200.0/600.0 V

Resolution 0.0001 to 1.9999/19.999/199.9/600 V

Accuracy ±0.02% of reading and ±.02% range typical

Secondary Voltage Measurement

Ranges 0 to 2/20.0/200.0/2000.0 V

Resolution 0.0000 to 19.999/199.9/1999.9 V

Accuracy 0 to 999.9 V

Ammeter

Output

Ranges 0.0 to 1.0/10.0/60.0 A

Resolution .001/.01

Input

Excitation curve testing

Range 0.0000 to 0.1/1.0/8.0 A

Accuracy ±0.08% of reading ±.08% range typical

100 to 132 V or 200 to 264 V, 1ø, 50 or 60 Hz,
15 A max.

0 to 30 V at 5.0 A max
(15 minute on, 5 minute off)
0 to 300 V at 1.0 A max
(15 minute on, 5 minute off)
300 to 2000 V at 1.0 A max
(5 minute on, 5 minute off)

(15 minutes on, 5 minutes off)

±1.0% of reading typical max

±0.05% of reading and ±05% range maximum

±0.02% of reading and ±.02% range typical
±0.05% of reading and ±.05% range maximum

1000 to 2000 V

±0.08% of reading and ±.08% range typical
±0.2% of reading and ±0.2% range maximum

±0.2% of reading ±0.2% range maximum

Phase Angle Measurement

3 digits

Range 0 to 360 degrees

Resolution 1 minute

Accuracy ±3 minuntes typical

±6 minutes maximum

Ratio

Secondary Voltage Injection Method

Range Accuracy

0.8 to 2000 ±0.02% typical
±0.05% maximum

2000 to 5000 ±0.03% typical
±0.1% maximum

5000 to 20000 ±0.05% typical
±0.2% maximum

Winding Resistance Test

Measuring Range 0 – 30 Ω

Accuracy (at 20° C) ±1%, 0 – 30 Ω

Insulation Test

Test Voltage 1000 VDC, 500 VDC

Measuring Range 20 GΩ, 10 GΩ

Short Circuit Current 1.5 mA nominal

Test Current on Load 1 mA at min. pass values of insulation

Accuracy 1000 volts ±3% ±2 digits ±0.2% per GΩ

Communication

(as specified in BS7671, HD 384 and IEC 364)

500 volts ±3% ±2 digits ±0.4% per GΩ

Ethernet

Interfaces

Environment

Operating -10º C to 50º C

Storage -30º C to 70º C

Enclosure The unit is housed in a rugged enclosure suitable

Standards

Dimensions

Weight

for use in outdoor substations.

IEC 61010, CSA 22.2, CE

14” H X 7.5” W X 12” D
(36 H X 19.3 W X 30.5 D cm)

36.7 lb (16.7 kg)

MRCT

Megger Relay and Current Transformer Test Set

DESCRIPTIONS OF HARDWARE OPTIONS
AND ACCESSORIES

RELAY TESTING OPTION

DESCRIPTION

The MRCT can be configured to include the functionality to test
electromechanical, solid-state and microprocessor based over­current relays, including voltage controlled, voltage restraint and
directional over-current; test under/over voltage, single-phase
impedance, single-phase power, directional, synchronizing, auto­synchronizing, negative sequence under/over voltage, current
balance, frequency, volts/hertz, reclosing, thermal and various other
relays

APPLICATIONS

The current channel is rated for 30 amps @ 200 VA continuous, up
to 60 amps @ 300 VA for short durations. It has a unique flat power
curve from 4 to 30 amps that insures maximum compliance voltage
to load at all times. With a high compliance voltage of 50 volts the
SMRT1 has the capability to test high impedance over-current relays.
The voltage channel can provide a variable output of 0- 30/150/
300 Volts at 150 VA of output power, and has a unique flat power
curve from 30 to 150 volts insuring maximum output power to the
load at all times. With the voltage channel converted to current,
it can perform minimum operating point, slope and timing on
current differential relays, including harmonic restraint transformer
differential relays (which can be tested one phase at a time).

RELAY OPTION SPECIFICATIONS

Outputs

Output Current

Output Current Power
Max V / Duty Cycle

AC Voltage Output

Metering

AC Voltage Amplitude

Accuracy ±0.05% reading + 0.02% range typical, ±0.15%

Resolution .01

Measurements AC RMS

Ranges 30, 150, 300V

AC Current Amplitude

Accuracy ±0.05% reading + 0.02% range typical,

Resolution .001/.01

Measurements AC RMS

Ranges 30, 60A

DC Voltage Amplitude

Accuracy 0.1% range typical, 0.25% range maximum

Resolution .01

Measurements RMS

Ranges 30, 150, 300V

DC Current Amplitude

Accuracy ±0.05 % reading + 0.02 % range typical,

Resolution .001/.01

Measurements RMS

Ranges 30A

All outputs are independent from sudden
changes in line voltage and frequency. This
provides stable outputs not affected by sudden
changes in the power source. All outputs are
regulated so changes in load impedance do not
affect the output.

Output power ratings are specified in
AC rms values and peak power ratings.

1 ampere 15 VA 15.0 V rms continuous

4 amperes 200 VA (282 peak)

50.0 V rms continuous

15 amperes 200 VA (282 peak)

13.4 V rms continuous

30 amperes 200 VA (282 peak)

6.67 V rms continuous

75 amperes 300 VA (424 peak)

5.00 V rms 90 cycles

DC 200 Watts

Outputs are rated with the following Ranges:

Output volts power max I

30 volts 150 VA 5 amps

150 volts 150 VA (see Power V)

300 volts 150 VA 0.5 amps

DC 150 watts

Duty Cycle: Continuous

Measured output quantities such as AC amperes,
AC Volts, DC volts or DC amperes, and time may
be simultaneously displayed on the large, color
TFT LCD, optional STVI touch screen. The AC
and DC outputs display the approximate voltage/
current output prior to initiation of the outputs.

reading + 0.05% range maximum

±0.15% reading + 0.05% range maximum

±0.15 % reading + 0.05 % range maximum

Style Number Identification

MRCT

Megger Relay and Current Transformer Test Set

ORDERING INFORMATION

Model MRCT -

Reserved for future use

Reserved for future use

Multi Function Testing Option
C = CT testing only
R = Relay testing and CT testing

IEC 61850 Option
1 = With IEC 61850 GOOSE
0 = Without

Integrated Insulation Test
N = No integrated insulation resistance test
R = Integrated insulation resistance test

CE Compliance Option
0 = No CE compliance/ANSI overlay
1 = No CE compliance /IEC overlay
2 = CE compliance/ANSI overlay
3 = CE compliance /IEC overlay

0 MS

DESCRIPTIONS OF HARDWARE OPTIONS

Multi Function Testing Option

Customers can choose which type of testing functionality they want
the MRCT unit to come with. Enter the letter C for the unit to come
with the current transformer testing capability only, or enter the
letter R for the unit to also have relay testing functionality.

IEC 61850 Option

If the MRCT is configured to test relays, Megger GOOSE
Configurator software may be used in the testing or commissioning
of IEC 61850 compliant devices. In order for the MRCT to be able
to subscribe as well as publish GOOSE messages, the MRCT must
be configured to test relays and the IEC 61850 feature needs to
be enabled. Enter the number 1 for the unit to come with the IEC
61850 option enabled. Enter 0 for the unit without IEC 61850
enabled.

Integrated Insulation Test

Enter R for the unit to come with an integrated insulation resistance
test capability. Enter N for the unit without an integrated insulation
test.

Bluetooth Option

For customers who wish to have a wireless control of the SMRT unit,
enter the number 1 for the unit to come with the Bluetooth option
installed. Enter 0 for without.

Test Leads Option
N = Without leads
S = Standard leads
K = Kelvin leads

Bluetooth Options
1 = With Bluetooth

0 = Without Bluetooth

Reserved for future use

Onboard Display/Enclosure
0 = No onboard display w/small enclosure
2 = Onboard display w/long enclosure

Power Cord Option
A = North American power cord

I = International power cord

E = Continental Europe power cord
U = United Kingdom

Power Cord Option

Customers can choose which type of power cord they want the unit
to come with.

A option – NEMA 5-15 to IEC60310 C13 connectors, UL & CSA
approved for countries with NEMA outlets.

I option – International color coded wires (light blue, brown and
green with yellow stripe) insulation jacket stripped ready for male
connector with IEC 60320 C13 connector. CE marked.

E option – CEE 7/7 Schuko plug to IEC 60320 C13 connector.
CE marked.

U option – United Kingdom power cord with IEC 60320 C13
connector, and 13 amp fuse. CE marked.

Test Leads Option

Enter the letter N for the unit without test leads. Enter the letter S
for the unit to come with set of standard test leads. Enter the letter

K for the unit to come with both standard and Kelvin test leads.

Test Leads and Accessories

All units come with a power cord (see power cord option), and
Ethernet communication cable, and instruction manual CD. All
other accessories vary depending on the options selected, see table
of optional accessories.

MRCT

Megger Relay and Current Transformer Test Set

DESCRIPTION Part Number

Included Standard Accessories

Power cord - Depending on the style number, the unit will come with one of the following

Line cord, North American 620000

Line cord, Continental Europe with CEE 7/7 Schuko plug 50425

Line cord, International color coded wire 15065

Line cord, United Kingdom 90002-989

Ethernet crossover cable for interconnection to PC, 210cm (7 ft.) long (1 each) 620094

Instruction manual 80989

Table of Accessories

Accessories are supplied with the selection of either the standard test leads option, the Kelvin test leads option, and/or the relay option.
With the selection of the standard test leads option; the number and type of leads and accessories included are outlined below. If desired,
test leads and accessories can be ordered individually, see description and part numbers.

DESCRIPTION Part Number

Optional accessories included in standard set of test leads and descriptions

Accessory carry case: Use to carry power cord, Ethernet cable, optional STVI and test leads, (1 each) 2003-725

Set of primary test leads: H1, H2 test leads 40 ft (12.192m) (4 each) 2003-164

Set of secondary test leads: 5 Tap ( X1, X2, X3, X4, X5) Test Leads, 20ft (6.096m) (1 each) 2004-005

Ground lead, green with yellow, with large ground clip, 20 ft, (1 each) 2003-724

Large test clip, red, 40mm opening (1 each) 640266

Large test clip, black, 40mm opening (1 each) 640267

Alligator clip, black, 4.1mm (5 each) 90004-427

Spade lug adapter (small): Small lug fits most new relay small terminal blocks.
Lug adapter, RED, 4.1 mm, use with test leads up to 1000 V/20 amps CAT II (5 each)

®

Cable/spade lug adapter (large): Large spade lug fits older relay terminal blocks, or STATES
FTP14 test paddles, ABB or General Electric test plugs with screw down terminals (5 each)

Screw in banana test jack (5 each) 90004-599

USB memory stick (1 each) 830029

With the Kelvin test leads option, a complete set of standard test leads are included as well as set of Kelvin leads. If desired,
Kelvin test leads can be ordered individually, see description and part numbers.

Company FTP10 or

Standard test

leads option

684004

684003

MRCT

Megger Relay and Current Transformer Test Set

DESCRIPTION Part Number

Accessories included in Kelvin set of test leads and descriptions Relay option

Set of Kelvin test leads: Test leads, 20ft ( 6.096 m) (2 each) 90004-684

With the relay testing option the number and type of leads and accessories included are outlined below. If desired, test leads and
accessories can be ordered individually, see description and part numbers.

Accessories included in standard set of relay test leads and descriptions Relay option

Sleeved pair of test leads: Keeps the test leads in pairs and from getting entangled.
Sleeved test leads, one red, one black, 200 cm (78.7”) long, 600 V, 32 amperes CAT II (4 pair)

Cable/spade lug adapter (small): Small lug fit most new relay small terminal blocks.
Lug adapter, red, 4.1 mm, use with test leads up to 1000 V/ 20 amps CAT II (4 each)

Lug adapter, black, 4.1 mm, use with test leads up to 1000 V/ 20 amps CAT II (4 each) 684005

Jumper lead: Used to common returns together on units with floating ground returns, or parallel of current
channels. Jumper lead, black, 12.5 cm (5”) long, use with voltage/current outputs, 600 V, 32 amps CAT II (1 each)

Smart Touch View Interface

The MRCT is available with the STVI-1, with an external Power over Ethernet (PoE) interface unit. The PoE power supply has two Ethernet
ports. One port labeled Data & Power Out connects to the STVI Ethernet port, and the Data In port connects to the PC/IN port on the
MRCT.

Smart Touch View Interface (STVI-1 includes the following) STVI-1

Smart Touch View Interface (1 each) STVI-1

Power over Ethernet Interface (1 each)

The PoE interface unit comes with a NEMA 5-15 power cord only. Other power cords are optional, and must be ordered separately
(see Power Cord Option for descriptions and part numbers)

STVI Ethernet cable assembly, 210cm (7 ft.) long (1 each) 620094

2001-394

684004

2001-573

90001-736

MRCT

Megger Relay and Current Transformer Test Set

UK
Archcliffe Road Dover
CT17 9EN England
T [phone]
F [phone]
[e-mail]

UNITED STATES
4271 Bronze Way
Dallas TX 75237-1019 USA
T 800 723 2861 (USA only)
T [phone]
F [phone]
[e-mail]

OTHER TECHNICAL SALES OFFICES
Valley Forge USA, College Station USA,
Sydney AUSTRALIA, Täby SWEDEN, Ontario
CANADA, Trappes FRANCE, Oberursel
GERMANY, Aargau SWITZERLAND, Kingdom
of BAHRAIN, Mumbai INDIA, Johannesburg
SOUTH AFRICA, Chonburi THAILAND

CERTIFICATION ISO

Registered to ISO 9001:2000 Cert. no. Q 09290

Registered to ISO 14001-1996 Cert. no. EMS 61597

MRCT_DS_EN_V03

www.megger.com

Megger is a registered trademark