SVERKER 900 relay and substation test system

You may not be getting output for two reasons. First, the channel is disabled; therefore, activate the channel. Second, the thermal cut-out could have tripped due to an overload; in this case, wait until the unit has cooled.

The miniature circuit breaker F1 may have tripped; please check the miniature circuit breaker.

The U4/DC amplitude field may be disabled because the voltage generators are set in parallel or serial mode (U1-U4). Set the generators to work separately.

The binary inputs won’t operate for two reasons. First, you have the wrong setting in the BI menu; therefore, check the BI menu, voltage/contact sense open or closing. Secondly, the debounce filter time is inappropriate; please change it to an appropriate time. The default is 5 ms.

The SVERKER is in the wrong mode; go to the system configuration menu and ensure the “Advanced mode” is on.

A malfunctioning ammeter indicates that Fuse F2 is faulty. Please replace the F2 fuse.

The ammeter or voltmeter will display incorrect values if your settings are wrong. Check settings for AC/DC and ranges.

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.