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5 SETPOINTS
5.6 S4 ELEMENTS
Protection and monitoring elements are configured in this page. This includes: complete differential protection;
phase, neutral, ground, negative sequence overcurrent protection; restricted ground fault (differential ground)
protection; under, over, and rate-of-change of frequency; overexcitation; harmonic monitoring; analog input
monitoring; current demand monitoring; and transformer overload monitoring.
SS SETPOINTS
SS S4 ELEMENTS
Each element is comprised of a number of setpoints, some of which are common to all elements. These com-
mon setpoints are described below, avoiding repeated descriptions throughout this section:
<NAME OF ELEMENT>
FUNCTION: Enabled
<NAME OF ELEMENT>
TARGET: Latched
<NAME OF ELEMENT>
BLOCK: Disabled
GE Power Management
This message indicates the start of setpoints page S4 ELEMENTS. Press
to view the contents of this page, or
M E SSA G E
Range: Disabled / Enabled
Select Enabled to enable the element. For critical protection elements, this
setpoint will normally be set to Enabled except for test purposes. For elements
which are not to be used, this setpoint should be set to Disabled.
Range: Self-reset / Latched / None
Target messages (accessed by the
have picked up or operated. Select Latched to keep the element target
message in the queue of target messages, even after the condition which
caused the element to operate has been cleared, until a reset command is
issued. Select Self-reset to automatically remove the target message from the
queue of messages after the condition has been cleared. Select None to
inhibit the display of the target message when the element operates. Thus an
element whose "target type" is None will never disable the LED self-test feature
because can not generate a displayable target message.
Range: Disabled / Logc Inpt 1 (2-16) / Virt Inpt 1 (2-16) / Output Rly 1 (2-8) /
SelfTest Rly / Virt Outpt 1 (2-5)
Select any logic input, virtual input, output relay, or virtual output which,
when asserted or operated, will block the element from operating. Selecting
a logic input or virtual input allows the element to be blocked based on a
decision external to the 745. Selecting an output relay or virtual output
allows the element to be blocked based on conditions detected by the 745
and the combination of logic programmed in the associated FlexLogic™
equation.
745 Transformer Management Relay
5.6 S4 ELEMENTS
5.6.1 DESCRIPTION
to go to the next page.
S ETPO INT
5.6.2 INTRODUCTION TO ELEMENTS
key) indicate which elements
N EXT
5
5-45
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