FREJA 546 Relay test system
The FREJA 546 relay test system is a multipurpose, light, portable instrument designed for the secondary testing of protection relays. It can be operated either manually, via the built-in touch screen user interface running FREJA Local software or placed under full computer control via the FREJA Win software. The built-in user interface is Megger’s second generation of automatic/semi-automatic manual user interface.
The high-power voltage and current channels can test virtually all types of protective relays. The FREJA 546 can convert the voltage channels into current channels so 6 current channels are available. All FREJA test sets can be daisy-chained where all channels are time synchronised and controlled as one system to cope with extreme test applications, i.e. large busbar protection systems or simultaneous injection in several Merging Units.
The large, easy to read Full Colour high resolution, high definition, TFT LCD touch screen display allows you to perform manual, steady-state, and dynamic testing quickly and easily. FREJA Local includes built-in preset test routines for automatic testing of protection relays and protection schemes. Menu screens and touch screen function buttons are provided to quickly and easily select the desired test function.
Tests and test results can be saved in FREJA Local memory and downloaded to a USB drive for test data transfer or to print test reports. Since the test set-ups and results are saved using Microsoft Explorer display, you can create your own test object structure. For fully automatic testing on a PC, each FREJA unit comes with an installed version of RTMS FREJA Remote. RTMS FREJA Remote is the FREJA Local software designed to run on a PC with the Windows 10 operating system. Additionally, both RTMS and the onboard system support direct transfer of installation files over Ethernet, eliminating the need for USB drives.
I cannot communicate with the unit; what should I check?
The most common form of communication used with the FREJA 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 FREJA. 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 FREJA or the PC to be on the other’s subnet will fix the issue. We recommend configuring the FREJA in DHCP mode so that it takes an IP address in the same subnet as the PC connected to it. If the FREJA’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.
What is the Bluetooth pairing code for the FREJA?
The Bluetooth pairing code is a standard default of 0000 (four zeroes).
A test is not stopping
Things to check:
- In the FREJA/RTMSIs the binary input on the FREJA 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 FREJA 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?
I cannot find the battery simulator. Where is the battery simulator on these units?
In the FREJA 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.
The times on my time-overcurrent curve are not correct. What do I need to check?
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.
If my unit has a built-in display, can I still control it with my computer?
Yes, you can control all FREJA models with and without display via your PC or laptop.
Choosing the best relay test set to buy is a really challenging task! Why are there so many different options on offer?
The real answer is so that you can buy a test set that’s a good match for your requirements and budget. Relay test sets represent a substantial investment, so there’s little point in spending more than you need on buying one with many facilities you’ll never use. On the other hand, buying a test set that seems inexpensive but can’t readily meet all of your requirements is a false economy. You’ll either end up replacing it or having to use time-consuming and uncertain workarounds to carry out your tests. That’s why Megger offers such a wide range of options. Consider three-phase testing, for example. Most applications require three voltages and three currents, which is enough to simulate most three-phase systems. But sometimes, a fourth voltage is needed to test, for example, the synchro-check function in complex relays. And for testing transformer differential protection, six currents are needed!
Are there test plans for my relays in the FREJA software?
RTMS includes a library of test plans called templates, which is available free of charge. The library can be downloaded and managed using a component of RTMS called “RTMS template manager.” Connect your PC to the internet, open “RTMS template manager”, and all the templates available in the cloud are shown. RTMS template manager will indicate which templates are already available on your PC. You can then download the ones that are not on your PC or update existing ones for which a newer version is available. The RTMS template manager will also indicate whether the templates are compatible with your software version. An upgrade of your local software version may be required to get some newer templates to work for you.
Does Megger have products and tools for IEC 61850 applications?
Yes! Megger is very active in this field. The company released its first products for IEC 61850 applications as early as 2009 and has been active in the development of the IEC 61850 standard since the mid-2000s.Today, Megger offers the FREJA and SMRT relay test sets, the hardware required to access the IEC 61850 network. Furthermore, the software Megger GOOSE Configurator (MGC) and Sampled Values Analyser (SVA) complete the IEC 61850 test system. With the MGC and SVA embedded in the SMRT and FREJA display models, the need to connect a computer to the IEC 61850 network is eliminated, enhancing cyber security.
How do I know if all my tests have passed?
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.
What are the criteria used to evaluate whether the test is passed or failed?
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.
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