OMICRON

Shot test, Search test, and Check test

In a Shot test, single test points are added to a test point table and are automatically processed.

In a Search test, zone reaches are determined automatically. Zone transitions are searched along freely definable search lines specified in the impedance plane, using an optimized algorithm.

In a Check test, test points are automatically set at the tolerance boundaries of zones. The setup is done with test lines (check lines) similar to a search test, but test points are only set at the intersections of the check lines with the zone tolerances.

A test in Advanced Distance can have any combination of Shot, Search, or Check tests. At test execution, the whole test settings are processed sequentially.

A powerful feature is the possibility to make test point definitions relative to the nominal characteristic of the distance relay (e.g. 90 % of zone 1, 110 % of zone 1, 90 % of zone 2, …). Test points are not entered in absolute R, X, Z, or angle values, but are referred to zone reaches and the line angle instead. This feature allows the creation of re-usable test templates, which adapt themselves to the actual relay settings.

Constant source impedance model

Besides the constant test current and constant test voltage models, Advanced Distance provides the constant source impedance test model which is useful in special cases where parameters such as SIR (Source Impedance Ratio) are important.

Load current

To verify special behavior of certain relays which occurs only when a pre-fault (load) current is present (e.g. accelerated tripping performance), a load current can be superimposed.