GE D30 Instruction Manual page 229

CHAPTER 5: SETTINGS
The pushbuttons can be automatically controlled by activating the operands assigned to the
and self-reset mode) and
PUSHBTN 1 RESET
the operand is asserted. The activation and deactivation of user-programmable pushbuttons is dependent
PUSHBUTTON 1 OFF
on whether latched or self-reset mode is programmed.
• Latched mode — In latched mode, a pushbutton can be set (activated) by asserting the operand assigned to the
setting or by directly pressing the associated front panel pushbutton. The pushbutton maintains the set
PUSHBTN 1 SET
state until deactivated by the reset command or after a user-specified time delay. The state of each pushbutton is
stored in non-volatile memory and maintained through a loss of control power.
The pushbutton is reset (deactivated) in latched mode by asserting the operand assigned to the
setting or by directly pressing the associated active front panel pushbutton.
It can also be programmed to reset automatically through the
settings. These settings enable the autoreset timer and specify the associated time delay. The autoreset timer can be
used in select-before-operate (SBO) breaker control applications, where the command type (close/open) or breaker
location (feeder number) must be selected prior to command execution. The selection must reset automatically if
control is not executed within a specified time period.
• Self-reset mode — In self-reset mode, a pushbutton remains active for the time it is pressed (the pulse duration) plus
the dropout time specified in the
pulse duration is specified by the
setting has no effect on the pulse duration.
PUSHBTN 1 SET
The pushbutton is reset (deactivated) in self-reset mode when the dropout delay specified in the
setting expires.
TIME
The pulse duration of the remote set, remote reset, or local pushbutton must be at least 50 ms to operate the
pushbutton. This allows the user-programmable pushbuttons to properly operate during power cycling events
and various system disturbances that can cause transient assertion of the operating signals.
NOTE
The local and remote operation of each user-programmable pushbutton can be inhibited through the
and settings, respectively. If local locking is applied, the pushbutton ignores set and reset commands
PUSHBTN 1 REMOTE
executed through the front panel pushbuttons. If remote locking is applied, the pushbutton ignores set and reset
commands executed through FlexLogic operands.
The locking functions are not applied to the autoreset feature. In this case, the inhibit function can be used in SBO control
operations to prevent the pushbutton function from being activated and ensuring "one-at-a-time" select operation.
The locking functions can also be used to prevent the accidental pressing of the front panel pushbuttons. The separate
inhibit of the local and remote operation simplifies the implementation of local/remote control supervision.
Pushbutton states can be logged by the event recorder and displayed as target messages. In latched mode, user-defined
messages can also be associated with each pushbutton and displayed when the pushbutton is on or changing to off.
— This setting selects the characteristic of the pushbutton. If set to "Disabled," the pushbutton is
PUSHBUTTON 1 FUNCTION
not active and the corresponding FlexLogic operands (both "On" and "Off") are de-asserted. If set to "Self-Reset," the
control logic is activated by the pulse (longer than 100 ms) issued when the pushbutton is being physically pressed or
virtually pressed via a FlexLogic operand assigned to the
When in "Self-Reset" mode and activated locally, the pushbutton control logic asserts the "On" corresponding FlexLogic
operand as long as the pushbutton is being physically pressed, and after being released the deactivation of the operand is
delayed by the drop out timer. The "Off" operand is asserted when the pushbutton element is deactivated. If the
pushbutton is activated remotely, the control logic of the pushbutton asserts the corresponding "On" FlexLogic operand
only for the time period specified by the
If set to "Latched," the control logic alternates the state of the corresponding FlexLogic operand between "On" and "Off" on
each button press or by virtually activating the pushbutton (assigning set and reset operands). When in the "Latched"
mode, the states of the FlexLogic operands are stored in a non-volatile memory. If power supply is lost, the correct state of
the pushbutton is retained upon subsequent power up of the relay.
— This setting specifies the top 20-character line of the user-programmable message and is intended to
PUSHBTN 1 ID TEXT
provide ID information of the pushbutton. See the User-definable Displays section for instructions on how to enter
alphanumeric characters from the keypad.
D30 LINE DISTANCE PROTECTION SYSTEM – INSTRUCTION MANUAL
(for latched mode only) settings. The pushbutton reset status is declared when
setting. If the pushbutton is activated via FlexLogic, the
PUSHBTN 1 DROP-OUT TIME
only. The time the operand remains assigned to the
PUSHBTN 1 DROP-OUT TIME
PUSHBTN 1 SET
PUSHBTN 1 DROP-OUT TIME
PUSHBTN 1 SET
and
PUSHBTN 1 AUTORST PUSHBTN 1 AUTORST DELAY
setting.
setting.
PRODUCT SETUP
(for latched
PUSHBTN 1 RESET
PUSHBTN 1 DROP-OUT
PUSHBTN 1 LOCAL
5-97
5