GE L90 Instruction Manual page 591

CHAPTER 5: SETTINGS
An additional condition is introduced to inhibit a fuse failure declaration when the monitored circuit is de-energized;
positive-sequence voltage and current are both below threshold levels.
— Enables and disables the fuse failure feature for Source 1 VT Fuse Fail.
VT FUSE FAILURE 1 FUNCTION
NEUTRAL WIRE OPEN 1 DETECTION
connected in Delta, do not enable this function because there is no neutral wire for Delta connected VT.
NEUTRAL WIRE OPEN 1 3 HRAM PKP
logic to pick up.
DETECTION
Base voltage for this element is
of DELTA VTs. The setting is found under
5.8.11.8 Open pole detector
SETTINGS  CONTROL ELEMENTS  MONITORING ELEMENTS  OPEN POLE
 OPEN POLE

L90 LINE CURRENT DIFFERENTIAL SYSTEM – INSTRUCTION MANUAL
— Enables and disables the VT neutral wire open detection function. When the VT is
— Specifies the pickup level of 3rd harmonic of 3V0 signal for the
setting in the case of WYE VTs and (
PHASE VT SECONDARY
SETTINGS  SYSTEM SETUP  AC INPUTS  VOLTAGE BANK  PHASE VT SECONDARY
Figure 5-210: VT fuse fail logic
OPEN POLE FUNCTION:

Disabled
OPEN POLE BLOCK:

Off
OPEN POLE VOLTAGE

SUPV: Disabled
NEUTRAL WIRE OPEN
PHASE VT SECONDARY
Range: Disabled, Enabled
Range: FlexLogic operand
Range: Disabled, Enabled
CONTROL ELEMENTS
)/ in case
.
5
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