Local Control Mode (Breakers And Switches) - GE 889 Instruction Manual

CONTROL

Local Control Mode (breakers and switches)

4–340
Local – when the setpoint "Local Mode" is enabled, Open and Close control of breakers and
switches is performed using relay pushbuttons (PBs), or contact inputs from PBs installed in
close proximity to the relay (such as on the relay panel, or in the relay cubicle).
The addition of contact inputs for closing and opening the breaker, or switch while in local
mode provides the flexibility to use PBs mounted near the relay. Please note that one pair
of PBs is used for breaker control, and another pair of PBs is used for switch control. If
contact inputs are used while the Select Before Operate (SBO) mechanism is enabled, the
breaker or the switch shall first be selected using the relay PBs, and then opened or closed
using the designated relay panel or cubicle PBs. (The "Select Before Operate" setpoint is
only available for relays supporting a single breaker.) If the SBO mechanism is disabled
while the relay supports configurable single line diagrams (SLDs), only the breaker PBs
either on the relay front panel or mounted nearby will work. The menu setpoints for local
switch Open and Close are hidden and deactivated.
If the relay does not support configurable SLD, the setpoints for local switch Open and
Close are omitted from the menu.
While in Local Mode, the letters LM are displayed on the relay display banner. In addition,
an LED can be programmed to turn ON when the relay is set to Local Mode. By default the
relay comes with one LED programmed to show Local Mode.
In Local Mode, control for the breakers and disconnect switches can be accessed from the
relay front panel (PBs programmed for Open and Close) or by contact inputs for Open and
Close from PBs installed near the relay. Hardcoded SLD PBs are designated for Tag, Block
and Bypass Block for each component upon selection. In this mode, the Local Open and
Local Close setpoints for Breaker Control or Switch Control (see the respective logic) are
active.
Remote – when Remote Mode is enabled, the switches are controlled (open/close) from
any assigned FlexLogic operand, contact input, virtual input, virtual output, remote input,
or via communication. The Control Mode menu is designed to switch the control for both
breakers and switches to either REMOTE MODE ("Local Mode" setpoint set to Off, or the
selected "Local Mode" input de-asserted), or LOCAL MODE (Local Mode setpoint asserted).
Breaker Mode defaults
The default value of the breaker control mode for the 889 ordered with one breaker is set
to Remote (Local Mode set to Off or the selected LOCAL MODE input de-asserted). In this
mode, all programmed setpoints from the respective menus for Breaker Control and
Switch Control (see the respective logic) are active. The default value for 889 ordered with
two breakers is Local.
Navigation
The 8 Series front panel provides navigation pushbuttons (PBs) which highlight the
component (breaker or disconnect switch) from the single line diagram. As shown in
4-142:Navigation and SLD component
Down/Left/Right depending on relay front panel model), are used to browse through the
SLD components. These PBs are used for SLD navigation only. The navigation starts with
highlighting the first breaker, and then goes through all other components in sequence,
until the last one (breaker or switch). Only the breakers and switches included in the SLD
from the display will be browsed (navigated).
Select Before Operate
Once the breaker or the switch is highlighted in the SLD using the navigation PBs, the
component must be selected before open or close action is performed. The selection of the
component is performed by pressing "ENTER" key from the front panel (see
142:Navigation and SLD component
selection, the navigation PBs (Up/Down or Up/
selection). A flash message " BKR # Selected", or "Sw #
889 GENERATOR PROTECTION SYSTEM – INSTRUCTION MANUAL
CHAPTER 4: SETPOINTS
Figure
Figure 4-