GE L30 Instruction Manual page 329

5 SETTINGS
• system unbalances under heavy load conditions
• transformation errors of current transformers (CTs) during three-phase faults
• fault inception and switch-off transients during three-phase faults
The positive-sequence restraint must be considered when testing for pickup accuracy and response time (multiple of
pickup). The operating quantity depends on the way the test currents are injected into the relay (single-phase injection:
I 0.2917 I ⋅ ; three-phase injection, opposite rotation:
=
op injected
GE Multilin
Figure 5–76: NEGATIVE SEQUENCE IOC1 SCHEME LOGIC
L30 Line Current Differential System
5.6 GROUPED ELEMENTS
I I ).
=
op injected
5
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