Clear Relay Records - GE L60 Instruction Manual

5 SETTINGS
components. The cut-off operation applies to quantities used for metering, protection, and control, as well as those
used by communications protocols. Raw samples of the voltages available via oscillography are not subject cut-off.
The
CURRENT CUT-OFF LEVEL
power cut-off level is calculated as shown below. For Delta connections:
----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- -
3-phase power cut-off
=
For Wye connections:
3
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- -
3-phase power cut-off
=
per-phase power cut-off
where VT primary = VT secondary × VT ratio and CT primary = CT secondary × CT ratio.
For example, given the following settings:
: "0.02 pu"
CURRENT CUT-OFF LEVEL
: "1.0 V"
VOLTAGE CUT-OFF LEVEL
: "100 A"
PHASE CT PRIMARY
: "66.4 V"
PHASE VT SECONDARY
: "208.00 : 1"
PHASE VT RATIO
: "Delta".
PHASE VT CONNECTION
We have:
CT primary = "100 A", and
VT primary =
PHASE VT SECONDARY
The power cut-off is therefore:
power cut-off = (
CURRENT CUT-OFF LEVEL
× 0.02 pu × 1.0 V × 100 A × 13811.2 V) / 66.4 V
= ( 3
= 720.5 watts
Any calculated power value below this cut-off will not be displayed. As well, the three-phase energy data will not accumu-
late if the total power from all three phases does not exceed the power cut-off.
Lower the
VOLTAGE CUT-OFF LEVEL
as valid measurements. Unless dictated otherwise by a specific application, the default settings of "0.02
pu" for
NOTE
CURRENT CUT-OFF LEVEL

PATH: SETTINGS PRODUCT SETUP
 CLEAR RELAY
 RECORDS
MESSAGE
MESSAGE
MESSAGE
MESSAGE
MESSAGE
GE Multilin
and the
VOLTAGE CUT-OFF LEVEL
×
3
CURRENT CUT-OFF LEVEL
× ×
CURRENT CUT-OFF LEVEL
×
CURRENT CUT-OFF LEVEL
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- -
=
x
PHASE VT RATIO
×
VOLTAGE CUT-OFF LEVEL
and
CURRENT CUT-OFF LEVEL
and "1.0 V" for
VOLTAGE CUT-OFF LEVEL


CLEAR RELAY RECORDS

CLEAR FAULT REPORTS:
Off
CLEAR EVENT RECORDS:
Off
CLEAR OSCILLOGRAPHY?
No
CLEAR DATA LOGGER:
Off
CLEAR ARC AMPS 1:
Off
CLEAR ARC AMPS 2:
Off
L60 Line Phase Comparison System
are used to determine the metered power cut-off levels. The
× ×
VT primary
VOLTAGE CUT-OFF LEVEL
VT secondary
× VT primary
VOLTAGE CUT-OFF LEVEL
VT secondary
× VT primary
VOLTAGE CUT-OFF LEVEL
VT secondary
= 66.4 V x 208 = 13811.2 V
× CT primary × VT primary)/VT secondary
with care as the relay accepts lower signals
are recommended.
Range: FlexLogic operand
Range: FlexLogic operand
Range: FlexLogic operand
Range: FlexLogic operand
Range: FlexLogic operand
Range: FlexLogic operand
5.2 PRODUCT SETUP
×
CT primary
(EQ 5.3)
× CT primary
(EQ 5.4)
× CT primary
(EQ 5.5)
5.2.4 CLEAR RELAY RECORDS
5
5-21