GE Multilin 750/760 Feeder Management Relay 5-5
5 SETPOINTS 5.1 OVERVIEW
5
FUNCTION setpoint:
The
<FeatureName> FUNCTION setpoint determines the operational characteristics of each feature. The range is as follows:
•If <FeatureName> FUNCTION: "Disabled", then the feature is not operational.
•If <FeatureName> FUNCTION: "Enabled", then the feature is operational.
•If
<FeatureName> FUNCTION: "Trip", then the feature is operational. When an output is generated the feature declares a
Trip condition, which operates the 1 Trip relay and any other selected output relays, and displays the appropriate trip
message.
•If
<FeatureName> FUNCTION: "Trip & AR" (overcurrent features of 760 Only), then the feature is operational. When an
output is generated, the feature declares a Trip condition which operates the 1 Trip relay and any other selected output
relays, signals an Initiate to the autoreclose feature, and displays the appropriate trip message.
•If <FeatureName> FUNCTION: "Alarm" or "Latched Alarm", then the feature is operational. When an output is generated,
the feature declares an "Alarm" condition which operates any selected output relays and displays the appropriate
alarm message.
•If
<FeatureName> FUNCTION: "Control" the feature is operational. When an output is generated, the feature operates any
selected output relays.
The "Trip", "Trip & AR", "Alarm", and "Control" function setpoint values are also used to select those operations that will be
stored in the Event Recorder.
RELAYS (3–7) setpoint:
The
<FeatureName> RELAYS (3-7) setpoint selects the relays required to operate when the feature generates an output. The
range is any combination of the 3 to 7 Auxiliary relays.
PICKUP setpoint:
The <FeatureName> PICKUP setpoint selects the threshold above (for over elements) or below (for under elements) which the
measured parameter causes an output from the measuring element.
DELAY setpoint:
The <FeatureName> DELAY setpoint selects a fixed time interval to delay an input signal from appearing at the output.
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 set-
point plus approximately 2 power frequency periods. From an AC parameter input level change measured by an instanta-
neous 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.
DIRECTION setpoint:
The <FeatureName> DIRECTION setpoint is available for overcurrent features which are subject to control from a directional
element. The range is "Disabled", "Forward", and "Reverse".
•If <FeatureName> DIRECTION: "Disabled", then the element is allowed to operate for current flow in any direction. There
is no supervision from the directional element.
•If
<FeatureName> DIRECTION: "Forward", then the element is allowed to operate for current flow in the forward direction
only, as determined by the directional element.
•If <FeatureName> DIRECTION: "Reverse", then the element is allowed to operate for current flow in the reverse direction
only, as determined by the directional element.
PHASES REQUIRED FOR ANY OPERATION setpoint:
This setpoint is available for those features which measure each phase parameter individually.
•If
PHASES REQUIRED FOR ANY OPERATION: "Any One", then an output is generated if any one or more phase parameters
are beyond the pickup value.
•If
PHASES REQUIRED FOR ANY OPERATION: "Any Two", then an output is generated if any combination of two or more
phase parameters are beyond the pickup value.
•If PHASES REQUIRED FOR ANY OPERATION: "All Three", then n output is generated if all three phase parameters are
beyond the pickup value.
Courtesy of NationalSwitchgear.com
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