Common Setpoints; Description - GE 750 Instruction Manual

7.4 COMMON SETPOINTS

7.4 COMMON SETPOINTS
To make the application of this device as simple as possible, similar methods of operation and therefore similar
types of setpoints are incorporated in various features. Rather than repeat operation descriptions for this class
of setpoint throughout the manual, a general description is presented in this overview. Details that are specific
to a particular feature will be included in the discussion of the feature. The form and nature of these setpoints is
described below.
(Feature Name)
FUNCTION:
The function settings of Trip , Trip & AR , Alarm and Control are also used to select those operations that will be
stored in the Event Recorder.
(Feature Name)
RELAYS (3-7):
7
(Feature Name)
PICKUP:
(Feature Name)
DELAY:
From a contact input change of state to a contact closure of the 1 TRIP relay, the total delay is the time
selected in this setpoint plus approximately 2 power frequency periods. From an AC parameter input level
change measured by an instantaneous feature to a contact closure of the 1 TRIP relay, the total delay is the
time selected in this setpoint plus approximately 2.5 power frequency periods. In both cases, auxiliary output
relays are approximately 5 ms slower.
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Range: as shown for each feature
If Setting = Disabled : the feature is not operational
If Setting = Enabled : the feature is operational.
If Setting = Trip : the feature is operational. When an output is generated the
feature will declare a "Trip" condition, which will operate the 1 TRIP relay and
any other selected output relays, and display the appropriate trip message.
If Setting = Trip & AR (Overcurrent features of 760 Only): the feature is opera-
tional. When an output is generated the feature will declare a "Trip" condition,
which will operate the 1 TRIP relay and any other selected output relays; sig-
nal an "Initiate" to the autoreclose feature, and display the appropriate trip
message.
If Setting = Alarm or Latched Alarm : the feature is operational. When an output
is generated the feature will declare an "Alarm" condition, which will operate
any selected output relays, and display the appropriate alarm message.
If Setting = Control : the feature is operational. When an output is generated the
feature will operate any selected output relays.
Range: Any Combination of the 3-7 AUXILIARY Relays
Selects the relays required to operate when the feature generates an output.
Range: As shown for each feature.
Selects the threshold above (for over- elements) or below (for under- ele-
ments) which the measured parameter causes an output from the measuring
element.
Range: As shown for each feature.
Selects a fixed time interval by which an input signal is delayed from appearing
at the output.
750/760 Feeder Management Relay
7 SETPOINTS

7.4.1 DESCRIPTION

GE Power Management