MPRT
Megger Protective Relay Test System
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The MPRT System consists of a
‘Power Box’, the TouchView Interface™,
and AVTS Software
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Unique new TouchView Interface (TVI)
simplifies the manual testing of complex
relays
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Ultra flexible output design provides
up to four-phase voltage and current
or eight-phase current
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User specified configuration.
Every system is made to order based
on specific customer needs.
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Includes fully automated testing capability
using AVTS Software (Version 3.0)
MPRT
Megger Protective Relay Test System
DESCRIPTION
The MPRT System is comprised of:
• The ‘Power Box’
• The TouchView Interface (TVI)
• AVTS Software
The ‘Power Box’ is the heart of the system. It employs a
variety of new features including unique Voltage and
Current Generator (VI-Gen) components which have been
combined into one amplifier package. Using multiple
VI-Gens provides the flexibility to deliver four voltages (or
two three-phase open delta voltages) and four currents or
combinations up to eight current channel capability. The
MPRT ‘Power Box’ also incorporates three communication
ports, a new Constant Power Output (CPO) capability and
every one is made-to-order based on each customer’s
individual testing requirements.
The TouchView Interface (TVI) device and AVTS Basic
Software form the brains of the system. The TVI, with its
large full color touch screen allows the user to perform
manual and semi-automatic testing quickly and easily,
using built-in, preset test routines for most popular relays.
Fully automatic testing can also be performed using AVTS
Basic Software which comes with the MPRT System.
APPLICATIONS
MPRT is specifically designed to perform routine testing of
protective relays used in the operation of electric utilities,
power plants and heavy industrials. Other applications
include use in government facilities, harbor and airport
installations, large building complexes and by testing
service companies who are increasingly interested in a
highly flexible, easy-to-use relay test instruments that can
help them improve their job efficiency.
MPRT SYSTEM COMPONENTS
The ‘POWER BOX’
The ‘Power Box’ is ultra flexible, rugged, lightweight and
feature packed. The unique features include:
NEW Constant Power Output (CPO) Capability –
Produces improved power output sustainable through the
entire “power curve” of a test. With a CPO of 200 VA per
current channel and 150 VA per voltage channel it has the
flexibility to test any relay.
Unique VI-Gen Internal Design – The Voltage and
Current Generator (VI-Gen) components have been
combined into one amplifier package. Using multiple
VI-Gens the system has the flexibility to deliver four
voltages (or two three-phase open delta voltages) and four
currents or eight currents for testing multi-phase
differential relays.
Built-in Transducer Testing Capability – Eliminates the
need for additional testing equipment or software. The
MPRT incorporates high accuracy amplifiers, a special
transducer DC input and test algorithms to test transducers
easily and effectively.
Shown without optional adjustable carry handle.
Shown with optional adjustable carry handle.
Here’s how easy it is
From the Preset Menu Screen, shown below, the user
simply selects the type of relay to be tested. Built-in test
files are for a wide variety of protective relays, including
Overcurrent, Differential, etc., see following figure.
MPRT
Megger Protective Relay Test System
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Includes Three Communication Ports – More built-in
flexibility with a protocol choice of IEEE488, RS232 or
Ethernet for high-speed download capability and upgrades
via the internet.
User Specified Configuration – Every system is made to
order based on each customer’s testing requirements and
budget, with an easy and flexible upgrade path.
Output Capabilities for Worldwide Use – Even more
built-in flexibility allows the user to choose from:
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VI-Gen amplifiers rated at 30A @ 200 VA and
convertible amplifiers rated at 300V or 5A @ 150 VA.
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VI-Gen amplifiers rated at 15A @ 200 VA and
convertible amplifiers rated at 150V or 5A @ 150 VA.
THE TOUCHVIEW INTERFACE (TVI)
Finally...an easier way to perform manual and semiautomatic relay testing. It’s all done via a unique hand
held controller called the TouchView Interface (TVI). The
most significant feature of the TVI is its ability to provide
the user with a very simple way to manually test even the
most complex relays manufactured today.
Manual operation is simplified through the use of a
built-in computer operating system and the TouchView
Interface, with a large color LCD touch-screen. The TVI
eliminates the need for a computer when testing virtually
all types of relays. Menu screens and function buttons are
provided to quickly and easily select the desired test
function.
Preset Relay Menu Screen
Overcurrent Relay Settings Screen
As an example, touch the ‘Over Current’ button. An
Overcurrent Test Menu Screen, shown below, will be
displayed showing all necessary functions needed to test
that particular type of relay. Next, the user inputs the relay
setting values that will be used to conduct the tests, such
as Relay Tap value and Time Dial value. These values are
used when conducting the pickup and timing tests.
To make it even better, the TVI has both IEEE and IEC
time curve algorithms built-in. By entering the appropriate
values in the setting screen, when the timing test is
conducted, the test results will be automatically compared
to the theoretical values from the time curve that was
selected.
MPRT TouchView Interface
TM
Back view of MPRT.
MPRT
Megger Protective Relay Test System
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As shown in the Overcurrent Settings screen, the IEEE Very
Inverse time curve was selected. If the Test Multiple is
changed, the appropriate theoretical trip time will change
automatically.
The TVI also has the ability to do even more complex tests
and calculations. For example, the MPRT with three
Voltage/Current Modules, can test single-phase, three-phase
open delta, and three-phase wye impedance relays using
the Impedance relay test screen. The user simply selects
different testing applications from a menu screen. For
instance, the Reach Test Settings Screen for an impedance
relay has been selected as shown below.
Impedance Reach Test Settings Screen
It should be noted that not only does the display screen
show values of voltage, current and phase angle, but it
also displays the current value where the relay should pick
up, (different formulas for calculating OHMS are selectable
using the touch-screen to select phase to phase or phase
to ground faults). The user can select ramp current and
hold fault voltage on ramp voltage and hold fault current.
The impedance test screen provides a pre-fault condition
for those relays that require a pre-fault load prior to
applying the fault. The test automatically determines values
like reach, maximum angle of torque, and timing.
Finally, for testing multi-zone relays, the user can select
the Pulse-Ramp method to determine operating points
without needing to defeat the other zone timers. Test
results can be saved to the internal memory for later
download and review.
Also easily test relays not on the Preset Menu
Other types of relays or devices not specifically listed in
the Preset Menu Screen can be tested using one of the
Manual Test screens.
Manual Voltage/Current Test Screen
For example, negative sequence under/over voltage,
reverse phase, phase sequence, and current balance relays
may be tested using the Voltage/Current manual test screen.
In addition, manual control of up to four voltages and
currents, or up to 8 currents is done using this test screen.
Other devices such as auto-synchronizing, frequency
sensitive devices and transducers also have their own
individual manual test screens. The user manually selects
the parameter(s) to be set or adjusted using the touchscreen and ramp outputs using the control knob. Each test
screen has a dynamic enable capability and will either
automatically step from a prefault, to fault, to breaker trip,
to reclose, or automatically ramp frequency at a
preprogrammed Hz/Sec, or time for a given slip frequency,
depending on which screen is in use. In the Manual AutoSynchronizing Test Screen, the advanced closing time and
closing angle are automatically done in the dynamic mode.
In the Manual Test Screen shown above, the pre-selected
outputs are set. The Green color indicates which output(s)
have been selected. When the test is started by pressing
the Start button, the selected output indicators will change
colors from green to red indicating which outputs are
energized. A vector graph indicates the relative phase
angles of all of the outputs. All of the outputs are metered
and displayed to provide real time verification of all of the
selected outputs.
Even perform manual transducer testing
With the built-in transducer test screen, manually testing
transducers has never been easier. The user simply selects
from a pull-down menu, what type of transducer is being
tested and enters information relative to the transducer’s
inputs and outputs. Upon starting the test, the test set
automatically measures and calculates the % error of the
device.
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Megger Protective Relay Test System
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From any test screen, the user has access to the Test File
Manager Screen. The user can give the test file/result file
any name up to a maximum of 99 characters. Once saved,
the user can recall the test and execute with the
appropriate settings already set, or recall saved test results
to download into the AVTS database for storage or for
printing.
All output values are metered and displayed
When under automatic computer control (with the AVTS
software), the TVI becomes a meter display for all of the
MPRT outputs. The metered values are displayed to
Meter Display Screen
TVI Default Setting Screen
Transducer Test Screen
In the above example, a three-phase, 3 Element Watt
Transducer is being tested. The actual output watts is
calculated based upon the measured values from the
MPRT into the transducer, and the transducer watts
is calculated based upon the measured output
voltage/current from the transducer. A % error is
automatically calculated and displayed. A vector
representation of the voltage and current outputs
is also displayed.
Use the File Manager to organize all test results
The TVI has sufficient internal memory to save hundreds
of test and result files. To manage the tests and results, the
MPRT has a File Manager screen.
File Manager Screen
provide continuous real-time verification of the MPRT
outputs, even when under automatic control.
Output values are displayed with a vector display, which
shows the vector relationship between the output voltage
and currents.
User customized configuration
The user may customize how the unit displays phase
angles (0-360° Lead/Lag or ± 180°), and set default values
of voltages, currents and frequency. The user may also
select a language for prompting the operator. Five
language choices are currently available, English, French,
German, Portuguese and Spanish.
Other default settings include GPIB and IP addresses,
Serial Port settings, Battery Simulator output and screen
background colors.
AVTS SOFTWARE
See page 8 for details regarding AVTS Software.
MPRT
Megger Protective Relay Test System
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FEATURES AND BENEFITS
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Large Color LCD touch-screen display - The TVI
features an easy to use and read display providing
manual control of the test set, and displays measured
values of voltage, current, along with phase angle and
frequency. Calculated values such as Ohms, Watts, VAR’s
and Power Factor may also be displayed, depending on
the test screen in use. Color contrasts accentuate vital
information. This reduces human error and time in
testing relays.
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Constant Output Power - The new MPRT employees
new high powered Voltage-Current amplifiers (VI-Gens),
which deliver maximum compliance voltage to the load
constantly during the test. Constant output power in
many cases eliminates the need to parallel current
channels together to test high burden relays.
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High resolution and accuracy - The TVI has Metered
outputs and a timer to provide extremely high accuracy.
High accuracy extends testing capability to other devices
such as transducers.
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Internal memory - The TVI provides storage of test
set-up screens and test results. Reduces testing time and
paper work. Saved test results can be downloaded into
the AVTS software database.
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Steady-State and Dynamic testing capability - The
MPRT provides, either through manual control or
computer control, both steady-state and dynamic testing
of protective relays. This includes programmable
waveforms with dc offset and harmonics.
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Display screen prompts operator - The TVI features
a display screen that prompts the user with easy to use
function buttons. Single button operation saves time in
testing relays and minimizes human error.
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Display screen provides five different languages The TVI display screen prompts the user in English,
Spanish, Portuguese, French or German.
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Output current and voltage sinewaves are generated
digitally - MPRT outputs do not vary with sudden
changes in input voltage or frequency, which increases
test accuracy and reduces testing time.
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Memory metering - Allows the user to set test currents
and voltages faster. Reduces heating of device under
test.
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Digital inputs and outputs - MPRT has 10
programmable inputs, and 6 programmable outputs
provide timing and logic operations in real-time with the
output voltage and currents. Binary Inputs can be
programmed, using Boolean logic, for more complex
power system simulations. This provides a low cost,
closed loop, power system simulator.
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Circuit breaker simulator - MPRT’s binary outputs
provide programmable normally closed and normally
open contacts to simulate circuit breaker operation for
testing reclosing relays. Sequence of operation, timing,
and lockout are easily tested.
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Performs transient tests - Perform acceptance or
troubleshooting tests by replaying digitally recorded
faults or EMTP/ATP simulations in the IEEE- C37.111,
COMTRADE Standard format.
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Perform End-to-End tests - Using AVTS software and a
portable GPS satellite receiver, the MPRT performs
satellite-synchronized end-to-end dynamic or transient
tests. Provides precisely synchronized testing of remotely
located complex protection schemes.
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Wide-ranging output frequency - The output
frequency of the current and voltage channels can be set
for any frequency from dc to 1 kHz. Popular test
frequencies such as 25, 50, 60 and 100 Hz are easily set
and controlled. Provides ultra-flexability to save time
and lower costs.
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RS-232 serial port - The RS-232 port provides a
computer interface to perform automatic testing.
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Ethernet port - The Ethernet port provides a highspeed computer interface. This can be used to quickly
download transient waveform data and update test set
firmware via internet.
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IEEE-488GPIB - The IEEE-488 is an OEM preferred
interface for control of the unit. This interface is
preferred, when using the unit with other IEEE-488
devices. It can also provide high speed downloading of
transient data.
MPRT
Megger Protective Relay Test System
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Universal input voltage - Operating from 90 to 264
Vac, 50/60 Hz, the MPRT can use virtually any standard
source in the world.
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Battery simulator - MPRT’s battery simulator provides
dc output voltages of 24, 48, 125 and 250 Volts.
Eliminates needing a separate dc source for providing
logic voltage for microprocessor-based relays.
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Immediate error indication - Audible and visual
alarms indicate when amplitude or waveforms of the
outputs are in error.
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Modular design - Output modules plug-in and slide
out easily for system re-configuration and maintenance.
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Ancillary Interface - Provides interface to other MPRT
units.
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MPRT Model 8430 - Provides up to 300 Volts rms. at
150 VA and 30 Amps rms. at 200 VA per phase. Ample
voltage for testing high instantaneous overvoltage relays.
The current amplifier has high compliance voltage at
low currents for testing ground overcurrent relays. When
configured with four channels, the current amplifiers can
be paralleled to provide a maximum of 120 Amperes at
800 VA, for testing instantaneous overcurrent relays.
With high VA output ratings, the unit can be used for
testing a panel of relays.
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MPRT Model 8415 - Provides up to 150 Volts rms. at
150 VA and 15 Amps rms. at 200 VA per phase. This
lower cost unit is ideal for testing relays used with 1
Amp secondary CT’s. The current amplifier has high
compliance voltage at low currents for testing ground
overcurrent relays. When configured with four channels,
the current amplifiers can be paralleled to provide a
maximum of 60 Amperes at 800 VA, for testing
instantaneous overcurrent relays. With high VA output
ratings, the unit can be used for testing a panel of
relays.
SPECIFICATIONS
Input Power
100 to 240 Volts, ±10%, AC, 1Ø, 50/60 Hz, 2100 VA.
Outputs
All outputs are independent from sudden changes in line voltage
and frequency. This provides stable outputs not affected by
sudden changes in the source. All outputs are regulated so
changes in load impedance do not affect the output. Each output
module consists of one current amplifier, and a voltage amplifier.
The voltage amplifier may be converted to a current source.
Therefore, one amplifier module may be used to test current
differential relays, including harmonic restraint.
Output Current
The following specifications cover both Model 8430 and Model
8415 modules. Outputs are rated with the following:
Model 8430
Per phase:
Output Current Power Max V
4 Amperes 200 VA 50.0 Vrms
7.5 Amperes 200 VA 26.7 Vrms
15 Amperes 200 VA 13.4 Vrms
30 Amperes 200 VA 6.67 Vrms
DC 200 Watts
With two currents in parallel:
Output Current Power Max V
8 Amperes 400 VA 50.0 Vrms
15Amperes 400 VA 26.7 Vrms
30 Amperes 400 VA 13.4 Vrms
60 Amperes 400 VA 6.67 Vrms
With three currents in parallel:
Output Current Power Max V
12 Amperes 600 VA 50.0 Vrms
22.5Amperes 600 VA 26.7 Vrms
45 Amperes 600 VA 13.4 Vrms
90 Amperes 600 VA 6.67 Vrms
With four currents in parallel:
Output Current Power Max V
16 Amperes 800 VA 50.0 Vrms
30 Amperes 800 VA 26.7 Vrms
60 Amperes 800 VA 13.4 Vrms
120 Amperes 800 VA 6.67 Vrms
Power Curve for Model 8430
With two currents in series, the compliance voltage doubles to
provide 4.0 Amperes at 100 Volts.
Model 8415
Per phase:
Output Current Power Max V
4 Amperes 200 VA 50.0 Vrms
7.5 Amperes 200 VA 26.7 Vrms
15 Amperes 200 VA 13.4 Vrms
DC 200 Watts
With two currents in parallel:
Output Current Power Max V
8 Amperes 400 VA 50 Vrms
15 Amperes 400 VA 26.7 Vrms
30 Amperes 400 VA 13.4 Vrms
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Megger Protective Relay Test System
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With three currents in parallel:
Output Current Power Max V
12 Amperes 600 VA 50 Vrms
22.5Amperes 600 VA 26.7 Vrms
45 Amperes 600 VA 13.4 Vrms
With four currents in parallel:
Output Current Power Max V
16 Amperes 800 VA 50 Vrms
30 Amperes 800 VA 26.7 Vrms
60 Amperes 800 VA 13.4 Vrms
Battery Simulator
The battery simulator provides the following DC output:
24, 48, 125 or 250 Volts at 60 Watts. Voltage output is controlled
via the Touch-View Interface, or through AVTS software.
Metering
Measured output quantities such as AC Amperes, AC Volts, DC
Volts or DC Amperes, and Time may be simultaneously displayed
on the large, variable contrast, color LCD touch screen. The
memory feature of the metering provides fast and accurate preset
of test values. The AC and DC outputs display the approximate
voltage/current output prior to initiation of the outputs. This
provides a fast, easy method for preset of outputs. Other values
that may be displayed, depending on which test screen is in view,
are phase angle, frequency, Ohms, Watts, VARS and Power Factor.
All Accuracies stated are from 10 to 100% of the range at 50/60 Hz.
AC Voltage Amplitude
Accuracy: ±0.05% typical, 0.1% guaranteed.
Resolution: .0001/.001/.01
Measurements: True RMS
AC Current Amplitude
Accuracy: ±0.05% typical, 0.1% or ±20 mA, which ever is greater,
guaranteed.
Resolution: .0001/.001/.01
Measurements: True RMS
DC Voltage Amplitude
Accuracy: ±0.1% typical, 0.25 % guaranteed.
Resolution: .0001/.001/.01
Measurements: True RMS
DC Current Amplitude
Accuracy: ±0.1% typical, 0.25 % or ±20 mA, which ever is greater,
guaranteed.
Resolution: .0001/.001/.01
Measurements: True RMS
Convertible Source in AC Current Mode
Accuracy: ±0.05% typical, 0.1 % or ±12.5 mA,
which ever is greater, guaranteed.
Resolution: .0001
Measurements: True RMS
Phase Angle
Ranges 0.01 to 359.99 degrees, Counter Clock Wise,
or Clock Wise rotation, or ±0.01 to ±180.00 degrees
Accuracy: ± 0.02° typical
± 0.25° at 50/60 Hz max
Frequency:
The output modules provide a variable frequency output with the
following ranges and accuracy.
Ranges
DC
0.001 to 1000.000 Hz
Output amplifiers can provide transient signals with a range of
DC to 10 kHz for transient playback.
Resolution: .001 Hz
Frequency Accuracy:
2.5 ppm typical
25 ppm 0° to 50° C, at 50/60 Hz
Total Harmonic Distortion:
Less than 0.1% typical,
2% maximum at 50/60 Hz.
Power Curve for Model 8415
With two currents in series, the compliance voltage doubles to
provide 4.0 Amperes at 100 Volts.
AC Voltage Output
The following specifications cover both the Model 8430 and 8415
modules. Outputs are rated with the following Ranges:
Model 8430
Per phase:
Output Volts Power Max I
30 Volts 150 VA 5 Amps
150 Volts 150 VA 1 Amp
300 Volts 150 VA 0.5 A
DC 150 Watts
With two voltages in series:
Output Volts Power Max I
60 Volts 300 VA 5 Amps
300 Volts 300 VA 1 A
600 Volts 300 VA 0.5 A
With three converted sources in parallel:
Output Current Power Max V
15Amperes 450 VA 30 Vrms
Model 8415
Per phase:
Output Volts Power Max I
30 Volts 150 VA 5 Amps
150 Volts 150 VA 1 Amp
DC 150 Watts
With two voltages in series:
Output Volts Power Max I
60 Volts 300 VA 5 Amps
300 Volts 300 VA 1 A
With three converted sources in parallel:
Output Current Power Max V
15Amperes 450 VA 30 Vrms