At least one 50GS element should be Enabled and configured as Forward or Reverse. This would typically
be configured to trip the circuit‑breaker. The 67GS directional element must be correctly configured to suit the
network.
Typically the test procedure is as follows:
•
Isolate the circuit and apply safety earths at both ends.
•
Apply a single phase to earth short circuit at any convenient location on the circuit.
•
Remove safety earths
•
Close the circuit‑breaker to energize the system with the primary short circuit applied.
•
Isolate the circuit at by opening the circuit‑breaker if it is not tripped already.
•
Check operation of the 50GS element and particularly 67GS Forward direction indication. If Reverse
direction is indicated as the fault direction this indicates that there is a wiring polarity problem that
requires investigation and correction.
•
Apply safety earths
•
Remove the test short circuit.
•
Remove the safety earths.
Functional Tests
9.5 Direction Test of the Earth Quantities for Directional Earth-Fault Functions
460 Reyrolle 7SR5, Overcurrent Protection Device, Device Manual
C53000-G7040-C014-1, Edition 11.2019
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