Clear Relay Records - GE L60 Instruction Manual

Line phase comparison system, ur series
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5.2 PRODUCT SETUP
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-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:
CURRENT CUT-OFF LEVEL
VOLTAGE CUT-OFF LEVEL
PHASE CT PRIMARY
PHASE VT SECONDARY
: "208.00 : 1"
PHASE VT RATIO
PHASE VT CONNECTION
We have:
5
CT primary = "100 A", and
VT primary =
PHASE VT SECONDARY
The power cut-off is therefore:
power cut-off = (
CURRENT CUT-OFF LEVEL
= (
= 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 and CURRENT CUT-OFF LEVEL with care as the relay accepts lower sig-
nals as valid measurements. Unless dictated otherwise by a specific application, the default settings of "0.02 pu" for
CURRENT CUT-OFF LEVEL and "1.0 V" for VOLTAGE CUT-OFF LEVEL are recommended.
NOTE
PATH: SETTINGS
PRODUCT SETUP
 CLEAR RELAY
 RECORDS
5-14
and the
VOLTAGE CUT-OFF LEVEL
×
3
CURRENT CUT-OFF LEVEL
----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- -
=
3
×
CURRENT CUT-OFF LEVEL
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- -
=
CURRENT CUT-OFF LEVEL
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- -
=
: "0.02 pu"
: "1.0 V"
: "100 A"
: "66.4 V"
: "Delta".
x
PHASE VT RATIO
×
VOLTAGE CUT-OFF LEVEL
× 0.02 pu × 1.0 V × 100 A × 13811.2 V) / 66.4 V
3


CLEAR RELAY RECORDS

CLEAR FAULT REPORTS:
Off
CLEAR EVENT RECORDS:
MESSAGE
Off
CLEAR OSCILLOGRAPHY?
MESSAGE
No
CLEAR DATA LOGGER:
MESSAGE
Off
CLEAR ARC AMPS 1:
MESSAGE
Off
CLEAR ARC AMPS 2:
MESSAGE
Off
L60 Line Phase Comparison System
are used to determine the metered power cut-off levels. The
×
×
VOLTAGE CUT-OFF LEVEL
VT secondary
×
×
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
Range: FlexLogic™ operand
Range: FlexLogic™ operand
Range: FlexLogic™ operand
Range: FlexLogic™ operand
Range: FlexLogic™ operand
Range: FlexLogic™ operand
5 SETTINGS
×
VT primary
CT primary
(EQ 5.3)
VT primary
×
CT primary
(EQ 5.4)
×
CT primary
(EQ 5.5)
5.2.3 CLEAR RELAY RECORDS
GE Multilin

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