Support for the SMRT46 and 46D multi-phase relay testers
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Troubleshooting
The most common form of communication used with the SMRT units is via ethernet. If you cannot establish communication, it is important to check that RTMS is enabled in the local firewall. Sometimes the antivirus installed on the computer will block ethernet communications to the SMRT. Another possible reason for the failure to communicate is that the IP addresses of the unit and the PC are not on the same subnet. Changing the IP address of the SMRT or the PC to be on the other’s subnet will fix the issue. We recommend configuring the SMRT in DHCP mode so that it takes an IP address in the same subnet as the PC connected to it. If the SMRT’s IP address has been set to a fixed value, it is possible to force the unit into DHCP mode using RTMS.
When serial communication, such as USB or Bluetooth, fails, the culprit is usually the port number used, which you can check on the device manager.
The Bluetooth pairing code is a standard default of 0000 (four zeroes).
Things to check:
- In the SMRT/RTMS
- Is the binary input on the SMRT configured as wet or dry contact? Does it correspond with the relay’s binary output’s operation?
- Is the type of operation properly selected? i.e. “Normally Closed” or “Normally Open” contact?
- Is the trip input properly selected? Sometimes the SMRT is connected to the proper output on the relay, but RTMS is expecting the trip input on a different channel.
- In the relay:
- Is the test signal used adequate for the test? For example, if a 51 pickup is being tested, the timing signal cannot be used to trip and vice versa.
- Is the trip properly assigned to the output on the relay?
- Is there any condition blocking the trip inside the relay?
- Is the proper polarising signal being used?
In the SMRT46 or SMRT46D units, the battery simulator doubles as the fourth voltage channel. For this reason, seeing the four voltage channels on the home screen indicates that the battery simulator is not activated. If that’s the case, go into the configuration screen by clicking on the “gearbox” button and click on the “Use Last V as Battery” button. When you return to the home screen, you’ll see that you no longer have a fourth voltage channel available, and the battery icon has been enabled.
Interpreting test results
Relay testing can range from basic tests, like verifying the relay detects the right overcurrent conditions, to extremely complicated tests verifying a plethora of operating conditions, and even synchronisation between different relays. With that in mind, the text below provides frequently asked questions that are focussed on results interpretation and verification that the results measured are viable.
For each test, the RTMS report provides a visual indication of the status of the results. Results status may be either not performed, incomplete, failed, or passed.
The RTMS evaluates the report and provides a pass or fail status based on whether all the tests have passed (or not). All the tests must have a passed status for the report to have a passed overall status. Each test is time-stamped, indicating the date and time when the test was performed.
Each test is evaluated using criteria specific to the test. For some tests, you can set the tolerances directly in the report. In contrast, for others, they must be set inside the test form before performing the test. The specific values for the tolerances used are your responsibility. You can find these in the relay's manual or select tolerances from the local test procedures.
The overcurrent curves are built around a pickup value, a time dial, and a curve type. They are sometimes affected by the election of an electromechanical reset. Those are the first things to check if the times are not correct.
If the curve followed by the results is like the target relay curve, but the times are lower than those of the target curve, then perhaps the issue is that we have selected a higher time dial than that of the relay. Another reason for lower times could be the choice of pickup value. If, for the test, we choose a pickup value higher than that of the relay, then the times will also be lower.
If the form of the results curve is different, then the type of the curve could be the reason. If there is an electromechanical reset or if we are testing an electromechanical relay, we must provide enough time between consecutive test points. This extra time will allow the relay to fully reset or return to the zero position before injecting current again.
Sometimes an instantaneous element is also inadvertently tripping on the same contact. This situation should be easy enough to verify since the trip times will be very low. In this case, testing for multiples below the pickup of the instantaneous will fix the issue.
User guides and documents
Software and firmware updates
SMRT
SMRT Firmware files - For SV capability there is a two app firmware available, one for 50 Hz systems and one for 60 Hz systems
PowerDB Software
Onboard install files are for FREJA, RTMS, SMRT and STVI local device installation. PC install is for remote operation of a wide range of Megger test instruments including FREJA, RTMS, SMRT, STVI and BITE5.
FAQs
Yes, there is a library of videos on Megger’s YouTube channel covering the use of our protection products.
Yes, it will work with ENOSERV if you have RTS version 7.0.4.2 or above.
RTMS files can be saved as active documents in an XML format called pdbxml. Those PowerDB documents can be reused to retest the same relay or to test a different relay of the same model.Another possibility is to save the test results into a PDF file directly from RTMS.
You must use GPS signals for synchronisation when performing end-to-end testing with the SMRT unit. You will need an external GPS receiver and antenna to work with the unit. Alternatively, it is possible to use an IRIG-B signal, already available at the substation, connected directly to the Binary Input 1 of the SMRT unit. You can use a PTP to IRIG-B Converter in cases where PTP is available and an IRIG-B signal or GPS signal is unavailable.In RTMS, you can use tools like the sequencer or COMTRADE Playback to perform end-to-end tests with different levels of complexity.
Yes, it is possible to perform end-to-end tests using different units on each end. You will need to measure the difference in injection time for each unit and account for that time difference at the start of the test. A procedure for doing just that has been discussed in several of Megger's Testing Tactics webinars:https://www.youtube.com/watch?v=-NZw7Y7XBiU
The floating ground option allows the voltage and current generators on the SMRT to be floating between them and the ground/earth so the customer can configure the test as needed. Easy paralleling and serialisation of the currents and voltages can be done. With the grounded option, the internal generators are tied together and grounded. Therefore, you can work with this option if the test leads going to the specimen are also tied together. This will prevent part or all of the return current from being forced through the internal ground of the test set, which could cause damage to the unit.
Yes, it is possible to test recloser relays using the different tools available in RTMS. In particular, the sequencer tool simplifies the job of testing recloser relays and recloser controls.When the recloser relay is inside a recloser control or in the field, you can use an additional tool called the Megger Electronic Recloser Test Simulator (ERTS) to interface with the recloser control. The ERTS allows recloser relay testing directly in the controller without disconnecting the relay analogue inputs or the binary inputs or outputs.
Yes. You can run the SMRT using your PC by connecting it via one of the available connection options. Those options include ethernet, USB, or Bluetooth. When a display unit is controlled from a PC, the display becomes a metering tool that shows what signals are being injected from the SMRT. The display indicates that the SMRT is being remotely controlled.
No. The software on the PC and the STVI are practically the same. There are only slight differences in how files are managed. This consistent experience makes it very easy to transition from one interface to the other.
It is unnecessary to input all the information for the test every time. Once the test has been configured, it is possible to save a test sheet with all the information relevant to the test and reuse it to test either the same relay a second time or a similar relay. It is also possible to export an individual test once saved to the test report. Once exported, the test can be imported into a different test report and reused.
With most controls in RTMS, it is possible to modify the configuration directly on the control by simply clicking on it. To change the configuration of a binary input, click on the specific binary input icon, which will bring up the Binary Input configuration screen. From there, you can change the type of binary from “wet” or “voltage activated” to “dry”. You can also change the type of action from normally open to normally closed contact.
To save a template, go to “FILE” then “SAVE” then look for the “Save As Template” button. At this point, name the template and save it to a location on the PC where it is easy to find.
On the “Home” screen, select the double arrow button just above the current or voltage channels. This button is labelled as “Current Ramp Options” when hovering over it. Select this button, and this is where you can change the increments.
Select the “System Configuration” button, the one that looks like a gearbox, then go to the “System” button on the top right. There you will find an area labelled “PHASE ANGLES”, where you can change the phase angles view.
The RTMS software will check if the firmware on the unit is compatible with the RTMS version on the PC or STVI. RTMS can upgrade the firmware on the SMRT if you let it do so. During the RTMS software install, the compatible firmware version included in the installation package is copied into a folder on your PC.Alternatively, it is possible to upgrade the firmware on the unit using a file available on this website. After downloading the file from the website, open RTMS, go to “Software Configuration”, and use the “Update Firmware” button to perform the upgrade. Follow the prompts on the screen. There’s also a YouTube video that covers this process. Additionally, it is also possible to upgrade the firmware using an STVI.
