3–52 850 FEEDER PROTECTION SYSTEM – INSTRUCTION MANUAL
SOFTWARE INTERFACE CHAPTER 3: INTERFACES
Message Timeout
), the browsing highlight around the object disappears. If an object is
selected, Home button operation will be prohibited. The object must be de-selected by
pressing escape in order for the home button to function.
NOTE:
Upgrading from firmware versions1.3x to 1.7x, the breaker operations from the front panel
now follow select-before-operate mechanism. The breaker must be first selected by
browsing and pressing Enter key for selection. Once selected, the breaker can be opened
or closed with the open and close pushbuttons. Upgrades from firmware versions below
1.3x are not supported.
Control Operations
The control operations carried out through the front panel of the relay are done only in
Local Mode (
Setpoints > Control > Local Control Mode > Local Mode). Opening and closing
operations can be carried out by pressing the Open and Close pushbuttons on the relay
front panel. Other operations such as tagging, blocking and bypassing can be carried out
by pressing the control pushbuttons that appear after the control object selection.
NOTE:
Remote operations are allowed for opening, closing, blocking, and bypassing. Tagging
must be done locally.
NOTE:
It is recommended to use tagging for maintenance purposes only. When a breaker or a
switch is tagged, it cannot be bypassed although the letters “By” may appear below the
element on SLD.
NOTE:
If breaker is selected and relay status is changed to Out-of-Service, the breaker control
actions, such as tag, blocked, bypass and open/close are blocked. The breaker may remain
in the selected state, but no action can be executed.
Once the selected breaker or switch is tagged, a letter “T” appears below the associated
element. Similarly, for blocking, letter “B” appears and for bypassing, letters “By” appear
below the associated breaker or switch as shown in the last column of the following figure.
The blocking and bypassing letters also appear if the breakers/switches are blocked or
bypassed remotely. These are linked to their respective breaker/switch in the SLD
Configurator window so that when that breaker/switch is deleted, the letters also get
deleted.
Permitted breaker/switch operations are described in the following figure below when
various letter indications are present under the control element.
Figure 3-28: Letter Indications for breaker/switch operations
For detailed tagging, blocking and bypassing operations, refer to the section Local Control
Mode (breakers and switches).
Breaker/Switch Position Letter Indication Operation Sample Indication
Open B Closing is blocked.
BKR1
ByTB
Closed B Opening is blocked.
Open B By Closing is blocked but bypassing is allowed.
Closing is permitted.
Closed B By Opening is blocked but bypassing is allowed.
Opening is permitted.
Open or Closed T Tagged by operator. No operation allowed.
Open or Closed T By Tagged by operator. No operation allowed.
Open or Closed T B By Tagged by operator. No operation allowed.
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