GE 750 Instruction Manual page 323

CHAPTER 6: ACTUAL VALUES
750 FEEDER MANAGEMENT RELAY – INSTRUCTION MANUAL
summary of the event that occurred. Each event is assigned an event number equal to the
number of events that have occurred since the recorder was cleared; the event number is
incremented for each new event. Event recorder data can be cleared with the
 
SETUP CLEAR DATA
Event information is gathered at the instant the event occurs; as such, the current and
voltage readings may reflect the transient nature of the event as opposed to steady state
values. All messages pertaining to phase voltages AN, BN, and CN are only displayed if
is programmed to "Wye". If
CONNECTION TYPE
"Delta", line voltages AB, BC, and CA are displayed.
Events are organized into several different types as shown in the table below. Several event
types can be filtered out in order to save space in the event recorder (see Event Recorder
on page 5–14 for additional details on event filtering). For every event type there are a
number of possible causes. The Cause of Events table lists all the event causes according
to which event types they can generate.
The following symbols are used in the description of the event messages: <Φ> represents
the phases involved (e.g. ΦBC) in the event if applicable and <ON> represents whether the
logic input is asserted (ON) or not asserted (OFF)
Event Type
General Events
Pickup Events
PICKUP: <Φ>
Trip Events
TRIP: <Φ>
Alarm Events
ALARM: <Φ>
Latched Alarm
LATCHED ALARM:
Events
<Φ>
Control Events
CONTROL: <Φ>
Dropout Events
DROPOUT:
Contact Events
INPUT C <ON>:
CLEAR EVENT RECORDER DATA
VT CONNECTION TYPE
Table 6–5: Event Types
Display
Events that occur when a specific
None
These are events that occur when a
protection element picks up and starts
These are events that occur when an
element whose function has been
programmed to "Trip" or "Trip & AR"
These are events that occur when an
element whose function has been
programmed to "Alarm" operates or
These are events that occur when an
element whose function has been
programmed to "Latched Alarm"
These are events that occur when an
element whose function has been
programmed to "Control" operates or
These are events that occur when a
protection element drops out after a
corresponding pickup event.
These are events that occur when a
contact input is either asserted or de-
A4 EVENT RECORDER
S1 RELAY
setpoint.
is programmed to
Description
operation takes place
timing
operates.
drops out.
operates or drops out.
drops out.
asserted.
VT
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