GE L30 User Manual

GE Multilin L30 Line Current Differential System 5-189
5 SETTINGS 5.6 GROUPED ELEMENTS
5
• 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:
; three-phase injection, opposite rotation: ).
Figure 5–76: NEGATIVE SEQUENCE IOC1 SCHEME LOGIC
I
op
0.2917 I
injected
⋅=
I
op
I
injected
=
FLEXLOGIC OPERANDS
NEG SEQ IOC1 FUNCTION:
NEG SEQ IOC1 PICKUP:
NEG SEQ IOC1 SOURCE:
NEG SEQ IOC1 BLOCK:
NEG SEQ IOC1 DPO
NEG SEQ IOC1 OP
NEG SEQ IOC1 PKP
RUN
AND
827058A6.CDR
SETTING
SETTING
Enabled=1
SETTING
SETTING
I_2
Off=0
SETTING
NEG SEQ IOC1
RESET DELAY:
NEG SEQ IOC1
PICKUP DELAY:
t
PKP
tRST
I_2 - K I_1 PICKUP

GE L30 Specifications

General

Brand	GE
Model	L30
Category	Relays
Language	English