Frequency & ROCOF protections: toward a better evaluation of their rapidity

Abstract

The new standard IEC 60255-181define several tests to evaluate characteristics of the frequency and ROCOF protections. We argue that the computational speed of the protection is an important characteristic to consider, which is currently not adequately covered by the above-mentioned standard. To overcome this issue, we propose a new test that could be introduced in the standard. This test is based on measuring the bandwidth of the protection.