MTS-5100/MTS-5000 Software Version 2.05 Features

Software Version 2.05 for your MTS-5100 or MTS-5000 Protective Relay Testing System includes some significant new features. This article gives you a brief introduction to each of the new features. It’s a long article, because we introduced a lot of new features in this release. You can click the table of contents to jump to a specific feature.

New three-phase differential productivity mode

What It’s For

This mode is optimized for testing three-phase differential relays, including:

  • Generator differential relays
  • Transformer differential relays

It was a beta-test feature in earlier versions, but in Version 2.05 it is available for all users. It supports a selection of popular relays, and also has a “plugin” mechanism to add more. If the relay you’re testing is not supported, Manta’s technical support staff may be able to create a plugin installer to add support for that relay, so you don’t have to wait for the next major software release.

How It Works

The major components of this new mode are:

  • Accepting setting values to describe the system under test, which comes from equipment nameplates, schematics / wiring diagrams and the configured relay settings.
  • Modeling the system under test, to the point of calculating the CT currents that would be presented to the relay in the actual system.
  • Performing the same calculations as the relay, to indicate the differential and restraint currents that should be used by the relay for the restrained and unrestrained elements.

For example, here is the settings screen for the SEL-387 relay:

Settings screen for the SEL-387 relay

In this case the transformer nameplate says winding 1 is D11 (Delta AB) and winding 2 is Wye, so those settings are entered on the top line. Just below that, we’ve indicated that the CTs both use wye connections, and the transformer description shows us the IEC nomenclature “Dy1” for this transformer.

Some settings can only come from the relay configuration, and those are named the same as the corresponding settings in the SEL-387 relay. The software has calculated the winding 1 and 2 tap currents, and internally it has configured a mathematical model of the transformer and CTs.

Back in the test screen, you’ll see the characteristic curve according to the relay settings, and as you adjust the winding currents the testing system’s current outputs (upper half of the screen) simulate the currents that would be presented to the relay with those actual in-winding current levels.

Three-phase differential test screen

Since winding 1 is delta, current present in one phase of that winding appears on two of the CTs, so the testing system’s current outputs do likewise. The testing system calculates the differential current (1.333 per-unit) and the restraint current (4.000 per-unit) to plot the phase “a” point on the graph.

Note that in the example shown, there’s another dot on the graph. That’s because zero-sequence removal causes differential and restraint current to appear on the non-fault phases (b & c), and the dot shows you that those phases might operate before the fault phase. That’s exactly what would happen in the real system for a single phase fault, with no currents through the non-faulted phases of the transformer windings. To test that relay, you need to add a bit of prefault current, to reduce the differential current on the non-fault phases so that the faulted phase will always operate first.

You can also use the “winding 2 direction” setting to test the unrestrained element, and turn on harmonics to test harmonic blocking, but I won’t bore you with those details here.

Supported Relays

At the time of delivery, Version 2.05 includes support for the following relays:

  • SEL-300G Generator Relay, when the E87 setting is “G” (i.e. generator protection)
  • GE T60 Transformer Protection System and other GE UR relays that include a transformer differential element
  • SEL-387 Current Differential and Overcurrent Relay
  • SEL-587 Current Differential Relay
  • SEL-787 Transformer Protection Relay

The plugin mechanism means we can add support for more relays between software releases, so let us know if you need support for a differential relay that’s not listed.

Improvements to 21: Distance (Impedance) Relay Test Mode

Menu Layout Changes

In Version 2.04.02 or earlier, to select a relay type in 21 mode you would go to the relay settings screen and press function keys to select the “settings format” for that relay.

We’ve added some new relay types in Version 2.05, making that mechanism cumbersome. Therefore we have decided to add some selection screens, which appear when you select 21 mode.

First you select the basic type: MHO, Quad or “Advanced Distance Protection”.

For MHO or Quad, you then select the specific type of relay. For MHO, the selections are:

  • Relay with K0/K-factor settings (SEL)
  • Relay with rectangular line settings (SEL-121)
  • Relay with polar line settings
  • KD-4, KD-10, KD-11
  • Relay with Z0/Z1 (GE UR)

The first four correspond to the old “generic” and settings formats 1 through 3. The fifth one is new in Version 2.05, optimized for testing the MHO distance elements in the GE D60 and other GE UR-series relays.

Improved support for quadrilateral distance elements

When you select “Advanced Distance Protection” on entry to 21 mode, it’s equivalent to the “Quad” zone type in Version 2.04. It allows you to specify any type of characteristic shape in a general way that’s not specific to a brand or model of relay.

When you select “Quad” in Version 2.05, you’re presented with a list of relays. As shipped, two popular quadrilateral distance relays are supported:

  • SEL relays, including the SEL-311C
  • GE UR relays, including the D60

Like the three-phase differential test mode, those relays are defined using plugins, so if the relay you’re testing isn’t on the list, we may be able to make a plugin for it, without waiting for the next major software release. SEL relays allow you to enable MHO and quad elements for the same zone, so the plugin for those relays supports testing the MHO characteristic, the quad characteristic or combined MHO/quad.

Settings are entered using the same setting names, etc., as the relay. The testing system calculates the quadrilateral shape, and for ground distance elements it computes the zero-sequence (K) factor.

D60 quad configuration

Quadrilateral-specific automatic tests are provided. The reach test allows you to specify angles at which to test, and it produces a report containing the measured reach at each point.

D60 quadrilateral reach test configuration screen

The operate-time test works the same way it does for MHO. You specify points within the characteristic shape to test the operate time, and the report includes a table of the measured times.

A subtle difference between our MHO and quad features is worth noting. For MHO relays, the selection of ground distance or phase distance is made using the Fault Type key (F8) on the test screen:

If you select the phase-to-neutral fault type, the relay is assumed to be a ground distance relay. Injected faults are single-phase, and the calculated zero-sequence factor (K-factor) is used to calculate impedance. If you select the phase-to-phase fault type, the relay is assumed to be a phase distance relay. Phase-to-phase faults are injected, and the K-factor is not used. When you select a three-phase fault, balanced conditions are injected. The K-factor cancels out in the math, so three-phase faults work for either ground distance or phase distance relays.

For quadrilateral distance elements, you select the element type (ground distance or phase distance) in the “Configure Test Settings” screen. That’s because most quadrilateral relays use different settings for ground and phase distance, and our configuration screens adapt so that you know which settings to enter for your particular configuration. A side-effect of this difference is that you can, for example, test the response of a phase distance element to a three-phase fault. The relay simulation and impedance calculations don’t change, so they still match what the relay should be doing in each case. Only the injected fault type changes.

Ramped and Pulsed Reach Tests

In Version 2.04, 21-mode automatic reach tests use a pulsed binary-search method. In Verison 2.05, you can select “ramped” or “pulsed”. The “pulsed” option works as it did in Version 2.04.

The “ramped” option uses a dual-ramp algorithm. At each test angle, the voltage or current is smoothly ramped twice, at two different speeds, in each case noting the point at which the relay operates. The difference in those operate points is used to determine the operating time of the relay, to back it off from the ramp end time. That way the reported reach results are precise, even if the relay has a long operate time.

If you specifically need to test the reach at which the relay will operate in a particular amount of time (for coordination with other zones, for example), you should continue to use the “pulsed” method and set the maximum operate time.

MHO Settings Format for the GE D60

Version 2.04 had four different settings format for MHO distance relay. Version 2.05 adds a fifth format, for the GE D60 and other GE UR relays. This mode allows testing of forward, reverse and non-directional elements.

It allows you to test forward, reverse and non-directional configurations, with settings specified in the same format used by the relay.


Adjustable Ramp Rate in the MHO MTA Test

If you use the automatic MTA test for a fast zone, you may find that a slower zone operates during each phase-angle ramp. The new ramp-rate setting allows you to speed up the ramp rate so that the fast zone operates before the slow one.

Improvements to 50: Instantaneous Overcurrent Relay Test Mode

This mode now allows you to specify the expected operate time, rather than assuming zero. That means you can easily test definite-time relays in this mode, rather than using 51 mode and a custom (flat) curve.

Improvements to 51: Time Overcurrent Relay Test Mode

The ANSI 51 productivity mode in the MTS-5100 and MTS-5000 includes curve data for a large number of relays and standards. If the relay you’re testing is not on that list, you can select “Generic Time Overcurrent Relay”, and enter the specific operate-time values for different multiples of the pickup.

In Version 2.05, we added the ability to install additional curves using plugins, without waiting for the next software release. Manta technical support staff can prepare a plugin file which you can load on your test system. When you do that, a new entry “Custom Time Overcurrent Relay Curve” appears in the relay selection menu for 51 mode:

Selecting that choice presents a list of all installed (“custom”) curves, and those can be used just like the standard ones.

Fault-state control for complex test sequences

In Manual Test / Advanced Settings, you can enable the “Maximum Fault Duration” feature:

When you do that, the test screen lets you set the maximum duration for each fault state in seconds or cycles (“Both” shows both, and adjusting one changes the other).

When you run the test, if the particular fault state is generating for the specified amount of time, the test system switches generation to the next fault state in sequence. If the time-out expires in prefault, generation switches to fault 1. If you have multiple fault states, fault 2, for example, times out to fault 3, and the last of those goes to postfault (or “off”, if postfault is not enabled).

As an example, you can set up two fault states, with a 1-second timeout on fault 1, and input 1 configured to transition from fault 1 to postfault. If input 1 closes before the 1-second timeout, postfault is generated. If not, generation switches to fault 2, indicating that the relay did not operate.

In Version 2.05 we added a new setting “Allow Selection of Time-Out States”.

When you select “Yes” for that setting, the test screen includes a setting called “Timeout Fault State”, allowing you to specify which state will be active when the timer expires.

This feature can be useful when you’re configuring very complex tests, such as complicated recloser schemes, using the Manual Test facility.

Enhanced reports in autorecloser productivity mode

The 79: Auto-Reclose Relay Test Mode produces a report including all the reclose times and the lockout time. In Version 2.05, we added the relay’s operate times to that test report.

Ability to combine voltage channels in series

In Manual Test, the “Configure Amplifiers” menu lets you set up parallel current configurations, for a smaller number of currents, but more amps per channel.

In Version 2.05, we added a “Voltage Configuration” setting to that menu so you can easily operate the voltage channels in series.


On an MTS-5100, each voltage channel can produce up to 250 VAC. By operating V1, V2 and V4 in series, you can produce a single voltage up to 750 VAC.

The V4 channel on the MTS-5000 is DC-only, and the V1,2,3 amplifiers can produce up to 150 VAC. On the MTS-5000, operating the V1 and V2 outputs in series allows you to produce up to 300 VAC.

The V3 output is not used in series configurations. That’s because V1, V2 and V3 share a common neutral, so there is no way to connect all three of them in series.

Simplified method for selecting angle display format

As in previous software versions, you can change the way angles are displayed on vector diagrams and in the per-channel phase angle column on the test screen. The old method still works. From the main menu (the one with the Manta logo), press F10 “Setup” and these settings appear (among others):

  • “Entry range for phase angles”, with options:
    • 0 to +360
    • -180 to +180
    • -360 to +360
  • “Meaning of positive angles”, with options:
    • Leading
    • Lagging

Using those settings, you can make the MTS-5100 or MTS-5000 represent angles the same way as the relay you’re testing, or the same way as some other software or test equipment for which your test procedures were written.

Users have often either found those settings to be confusing, or not realized that they exist. Also, they are power-on values, so you can’t use them to select a different angle format for two different tests, as when you’re testing two different vendors’ relays.

In Version 2.05 we have added a new setting in “Manual Test” / “Set up Display” called “Angle Display Format”.

The choices for that setting are:

  • As configured in “Setup”
    • Uses whatever format selected by the two settings found in the “Setup” menu.
  • SEL
    • selects positive=leading and range -180 to +180
  • GE UR
    • selects positive=leading (i.e. negative=lagging) and -360 to 0
  • GE SR
    • selects positive=lagging and 0 to 360
  • Enoserv RTS
    • selects positive=lagging and 0 to 360

When you save a manual test settings file, the new setting is included. When you subsequently load that file, the angle display format is configured as it was when you saved the file.

Little Things

USB keyboard emulation of the RESET, PREFAULT and FAULT keys

If you have plugged in a USB keyboard, and you’re on a screen where the RESET, PREFAULT and FAULT keys are enabled, those operations can now also be performed by pressing R, P and F on the keyboard:

  • R stops generation, and if generation is already stopped pressing R clears captured data from the screen (but not from the test report)
  • P starts generating the “prefault” state
  • F starts generating the “fault” state (or “fault 1”, if you have enabled multiple fault states). As with the physical FAULT key, pressing and holding F on the keyboard enters the “Static Fault” state, which means that inputs are ignored, and releasing the key goes back to the previous generation state (or turns generation off, if generation was off when you pressed the key). Static fault is useful for pickup testing, when you sometimes need to dial the current or voltage up and down to find the pickup point, without ending the test the first time the relay’s output closes.

Diagnostic file save

Manta technical support staff may sometimes ask you to send diagnostic information, to help them understand the issue in question. In the past, that meant accumulating various files using the Files menu, report viewers and sometimes the web interface.

In Version 2.05 we added a new “Save Diagnostic File” key. From the main menu, press F9 “Diagnostics”, and the F3 key is now “Save Diagnostic File”. You can save the file either to a USB flash drive or store it locally in the test system for later retrieval. The file includes, among other things:

  • A log of actions you took before saving the file: key-presses, setting adjustments, remote commands, etc.
  • All the plugin files you have installed, if any
  • The values of all settings
  • The latest report and sequence of events log
  • COMTRADE waveform files
  • Technical information about your system
  • Any captured error files
  • Maintenance logs
  • Calibration data

Many times the diagnostic file is all Manta’s technical support staff requires in order to understand your issue. Please save the file right after the issue arises, before powering down the test system. That way the log it saves will include a full record of what happened.

View help for the selected setting

Many screens have help information at the bottom, describing whichever setting is currently selected. In some screens, though, we have omitted the help area to make space for other things. In Version 2.05, you can obtain help for those settings:

  • Navigate to the particular setting using the arrow keys
  • Press the HELP key
  • Press F8 “Describe Selected Setting”

A description of the setting appears, along with information about the numeric range, selectable choices, etc. for the setting.

Improvements to IEC 61850 / GOOSE functionality

The MTS-5100 and MTS-5000 test systems include an easy-to-use facility for testing systems that use IEC 61850 GOOSE messaging. In Version 2.05 we have further expanded on that feature, adding support for some unusual ICD/SCL file formats and allowing more flexibility when configuring GOOSE outputs to publish.

Productivity modes show all menus even in “manual”

In previous software versions, some productivity modes required you to select “auto” using the F7 “Test Type” key before F4 “Configure Test Parameters” in order to adjust settings for the automatic tests. In Version 2.05, you can access those settings even when “Test Type” is set to “Manual”.

Custom user-displayable values

From a test screen, if you press F2 “Set up Display” you can select up to 8 calculated values or settings to show on the test screen, in addition to the standard ones (see “MTS-5000/5100 Basics: Displaying Calculated Values” on YouTube). For example, you can select “I Unbalance” to show the percent current unbalance. You might do that when you’re testing an unbalance relay, so you can see the relay’s operating parameter on the test system’s screen, and so that the percent unbalance at which the relay operated can be included in the test report.

In Version 2.05 we have added a mechanism allowing Manta technical support staff to add custom entries to the list using plugins. Please contact Manta technical support if you need to show a calculated value that isn’t included in the pop-up choice lists.

Report “Save” key hidden until you have run a test

If you load a settings file (or load settings from a report file) then try to save a report before you have run a test, the result selectors can change. That’s because some selectable result values only exist after you have run the test. To prevent that happening, in Version 2.05 the “Save” key does not appear in the report viewer after loading a file, until you have run a test.

MTS-5×00 Remote Console and RapidReporter can now work together

RapidReporter 0.94 or later has a “rerun” feature, allowing you to send the settings from a test report to a connected MTS-5100 or MTS-5000, and after running the test retrieve the results back into the database.

In Version 2.05, you can also use that feature when you are controlling the test system using the MTS-5×00 Remote Console program on your Windows PC. To do that, you need to add the “TCP” command-line argument to the shortcut you use to launch Remote Console. On your desktop (or in Windows Explorer, under “Desktop”), right click “MTS-5×00 Remote Console” and select “Properties”. In the “Shortcut” tab you’ll see a field called “target” (it should be highlighted when you first show Properties). Add tcp to the end of that field, as shown below:

Run Remote Console and connect to your MTS-5100 or MTS-5000. The TCP argument causes the program to listen to TCP port 60000, processing the same commands handled by the test system.

Now in RapidReporter’s “Rerun Test Definition” dialog you can enter the IP address (which means the same PC running RapidReporter), and re-run the test the same way you would when connected directly to the test system.


In Conclusion

That was just a brief introduction to the new features in Version 2.05 of the MTS-5100 / MTS-5000 software. We are preparing training material which will dive deeper into some of the individual features, and our technical support staff are here to help. You can always contact us at 1-800-233-8031, or by email:

You can download the latest MTS-5000 / MTS-5100 software and related PC software from our customer area, under “MTS-5000/MTS-5100 Software”.

Click here to request a free demonstration of the MTS-5100, including the new Version 2.05 features.

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