Software Version 2.06 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.
Table Of Contents
The SEL-487E transformer differential element is unusual, in that it uses more than just restraint current to select slope 1 or slope 2. Note in the image below that two traces are shown on the graph (one for each slope), and there’s a setting for “Slope to Test”. Most differential relays have a single trace, with each slope occurring only in a specific restraint current range, so that a particular restraint current always selects the same slope.
As stated in the SEL-487E manual:
Slope 1 is effective during normal operating conditions, and Slope 2 is effective when the fault detection logic detects an external fault condition.
In general the relay declares a fault to be external, and therefore enters high-security mode (longer operate time, slope 2 rather than slope 1) if it sees a change in restraint current not accompanied by a large enough change in differential current. It exits high security mode 60 cycles later, resetting that timer if there are additional step changes.
Testing slope 1 is the same as for most differential relays, except that you must apply pre-fault conditions for at least 60 cycles. For example:
To test slope 2, you need to make the relay stay in high-security mode. That means the test must finish quickly, which is best accomplished using an automatic ramp. For example:
Apart from slope 1 / slope 2 selection, testing the SEL-487E is the same as for any other transformer differential relay.
The SEL-487 relay has a unique “negative sequence differential” protection element. The three-phase differential productivity mode now includes support for this relay. Specifically:
Apart from those specifics testing works as it does for any of the other supported relays. As with all supported relays, the configuration menu lets you configure the relay settings so you don’t have to calculate anything.
In Productivity Modes, when you select “51: Inverse Time Overcurrent Relay Test Mode”, the list of basic curve types now includes “Cooper Recloser Time Overcurrent Curve”. Selecting that option allows you to pick a specific curve type: Cooper A, B, C, E, K, N, R, W, 2, 3, 8, 8*, 8t, 9 or 11.
Manta now offers a 14-pin recloser test cable compatible with several Cooper reclosers. Contact us for details.
We have made several small improvements to productivity modes, including:
Harmonic magnitudes and phase angles now use single-setting adjustment, except when the fault type is Arbitrary.
In the screen capture below, harmonics are enabled for a phase-to-neutral fault. Note that there is a single “Voltage Harmonic” setting and a single “Current Harmonic” setting (plus harmonic phase angle settings for each). The entered values are reflected in the upper grid for the fault phase (B, in this case), and they follow the fault rotation setting.
You can also ramp the harmonics (again for all fault types except Arbitrary). In the example above, pressing F4 (Advanced Settings) then F3 (Ramps) brings up the ramp settings, which now include harmonics. You can configure those to ramp harmonics at a precise rate from one level and/or angle to another. For example, below we have set the voltage harmonic to ramp from 20% to 30% at 5% per second.
When you’re saving an XML test report for use with RapidReporter, you can include the as-ramped end harmonic values to document your test result. Using the example above, after pressing F6 “Test Report” then F10 “Save”, the available “Result Selector” values include “Flt/ Voltage Harmonic” (voltage harmonic magnitude in Fault), as shown below.
If you’re using HTML reports, you don’t need to do anything special to include harmonics. The per-fault-state HTML tables always include harmonic magnitudes and phase angles, if they are enabled when you run the test.
In previous versions of the software, from Manual Test you can press F4 (Advanced Settings) then F2 (Set up I/O and Timers) then F9 (Configure Timers) to define programmable timers. In Version 2.06 that key is now “Configure Timers and Counters”.
In the image below, two counters have been configured:
To run this test, you’ll also set the “Go To” state for input 1 to “Same State” in “Fault State Control”, so that input 1 affects the fault state only when it pulses the given number of times. Also in “Advanced Settings”, make sure “Fault Incidence Angle (FIA)” is set to “Random”, because any other value affects timing.
This is a typical method for testing an energy (watt-hour) meter using the settings above:
The main test screen for Manual Test and some of the productivity modes has always shown the per-channel voltage and current vectors in graphical form. Version 2.06 adds the ability to superimpose vectors corresponding to the symmetrical components of the three-phase sets (positive-sequence, negative-sequence and zero-sequence voltages and currents).
Settings for the feature are in the Display Setup Menu (from Manual Test, press F2). When the feature is enabled, the vector diagram includes whichever sequence quantities you have selected to be shown in the dynamic display area on the test screen.
In the screen capture below:
Back in the test screen, in addition to the per-phase voltages and currents, the phasor diagram now has additional arrows for I1 and V2. Note that it is not necessary to enable display of both the magnitude and angle for a sequence quantity in order to display its vector. You only need to enable the magnitude readout.
You can now filter long drop-down lists by entering the first few characters on a keyboard. As you type characters, only the choices matching those characters will be shown. For example, in the Display Setup Menu, you can show just the entries beginning with an “i” by typing in that character, as shown below. Typing additional characters further reduces the list of choices to just entries beginning with those two or more characters.
Also a change has been made to some of the shortcut key definitions. In Version 2.05, you can press the P, F, R and H keys on a USB keyboard to emulate pressing of the PREFAULT, FAULT, RESET and HELP keys on the front panel. In version 2.06, you press Ctrl-P, Ctrl-F, Ctrl-R, Ctrl-H instead (i.e. hold down the Ctrl key and press the letter). Those key combinations are more difficult to press by mistake.
In several places, the software defines a function key so that pressing the key advances to the next in a series of selections. For example, in Manual Test, the F8 key is used to select the fault type, and pressing it advances to the next fault type.
When there are only a few different values for the key, that’s an easy and reliable selection. Sometimes, however, there are a lot of values available on a function key. For example, the F10 key in Manual Test lets you select the fault state to edit. Usually those states include only Prefault, Fault and perhaps Postfault. If you’re doing an Arbitrary test with all possible states enabled, however, there are 27 different values:
If you press one time too many, you have to press many times to get back where you were.
In Version 2.06, you can still select values that way, but we have added a new method:
To help users discover this feature, if you press several times on this type of function key a message appears:
Minor features and enhancements include:
That was just a brief introduction to the new features in Version 2.06 of the MTS-5100 / MTS-5000 software. We are preparing training material which will dive deeper into some of the individual features. If you need assistance you can contact Manta’s technical support staff at 1-800-233-8031, or by email: firstname.lastname@example.org.
You can download the latest MTS-5000 / MTS-5100 software and related PC software from our customer area, under “MTS-5000/MTS-5100 Software”.