Clear Relay Records - GE T60 Instruction Manual

CHAPTER 5: SETTINGS
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
= 720.5 watts
Any calculated power value below this cut-off does not display. As well, the three-phase energy data do not accumulate if
the total power from all three phases does not exceed the power cut-off.
Lower the
VOLTAGE CUT-OFF LEVEL
measurements. Unless dictated otherwise by a specific application, the default settings of "0.02 pu" for
and "1.0 V" for
CUT-OFF LEVEL

5.3.3 Clear relay records

SETTINGS  PRODUCT SETUP  CLEAR RELAY RECORDS
 CLEAR RELAY
 RECORDS
— Resets the access restriction counter.
RESET UNAUTH ACCESS
Selected records can be cleared from user-programmable conditions with FlexLogic operands. Assigning user-
programmable pushbuttons to clear specific records is a typical application for these commands. Since the T60 responds
to rising edges of the configured FlexLogic operands, they must be asserted for at least 50 ms to take effect.
Clearing records with user-programmable operands is not protected by the command password. However, user-
programmable pushbuttons are protected by the command password. Thus, if they are used to clear records, the user-
programmable pushbuttons can provide extra security if required.
For example, to assign user-programmable pushbutton 1 to clear demand records, apply the following settings.
1. Assign the clear demand function to pushbutton 1 by making the following change in the
 CLEAR RELAY RECORDS
: "
CLEAR DEMAND
PUSHBUTTON 1 ON
2. Set the properties for user-programmable pushbutton 1 by making the following changes in the
T60 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL
x = 66.4 V x 208 = 13811.2 V
PHASE VT RATIO
×
OLTAGE CUT-OFF LEVEL
V
and
CURRENT CUT-OFF LEVEL
VOLTAGE CUT-OFF LEVEL
CLEAR USER REPORTS:

Off
CLEAR EVENT RECORDS:

Off
CLEAR OSCILLOGRAPHY:

Off
CLEAR DATA LOGGER:

Off
CLEAR ARC AMPS 1:

Off
CLEAR ARC AMPS 2:

Off
CLEAR DEMAND:

Off
CLEAR ENERGY:

Off
RESET UNAUTH ACCESS:

Off
CLEAR DIR I/O STATS:

Off
menu:
"
× CT primary × VT primary)/VT secondary
with care as the relay accepts lower signals as valid
are recommended.
Range: FlexLogic operand
Range: FlexLogic operand
Range: FlexLogic operand
Range: FlexLogic operand
Range: FlexLogic operand
Range: FlexLogic operand
Range: FlexLogic operand
Range: FlexLogic operand
Range: FlexLogic operand
Range: FlexLogic operand
Visible only for units with Direct I/O module
PRODUCT SETUP
CURRENT
SETTINGS  PRODUCT SETUP
SETTINGS  PRODUCT
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