SVERKER 900 relay and substation test system

400 Hz power systems are sometimes encountered in marine applications and, far more frequently, in the aeronautical industry. These high-frequency systems are favoured because transformers and other components operating at this frequency are smaller and lighter than their 50/60 Hz counterparts. The SVERKER900 range can produce voltages and currents from DC to 600 Hz.

There are two parts to the fee structure – one is the software on the SVERKER screen that is categorised into three types: Basic (consists of Main and Prefault-Fault), Advanced (consists of Basic, CT Magnetization, Ramping, and Sequencer), and Expert (consists of Advanced and Impedance). The second is the reporting software, which is an additional cost but is optional. The SVERKER Viewer is a PC-based software that can create graphical test reports in PDF format. The PDF test report is created by opening a saved test file (on a USB drive) from the SVERKER900.

It is possible to test recloser relays using the different tools available in the SVERKER software. In particular, the sequencer tool simplifies the job of testing recloser relays and recloser controls.If the recloser relay is inside a recloser control or in the field, you may use a tool called the Megger Electronic Recloser Test Simulator (ERTS) to interface with the recloser control. The ERTS allows testing of the recloser relay directly in the controller without disconnecting the relay analogue inputs or binary inputs or outputs.

The SVERKER software does not offer any test plans for relays. This software is supposed to be used for manual and semi-automated testing.

Yes. Perform the test using the multiple timing function in the “prefault->fault instrument” selected from the “Home” menu. Then create the report in the SVERKER Viewer.

As with most controls on the SVERKER, 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 BI option on the home screen. There, the user can change the type of binary from wet or voltage-activated to dry, and change the type of action from normally open to normally closed contact.

Yes, there's a library of videos available on YouTube that cover most of the aspects of using the software.

There is no visual indication of pass or fail after performing tests with the SVERKER unit. You must assess your result based on the type of test being performed and the relay protection/setting being tested.

You should evaluate your results using criteria specific to the test. It is up to you to obtain the tolerance for a particular test to assess your results. The exact values for the tolerances typically can be found in the relay’s manual or selected from 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.