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L60 LINE PHASE COMPARISON SYSTEM – INSTRUCTION MANUAL
CONTROL ELEMENTS
CHAPTER 5: SETTINGS
5
The trip output element is primarily used to collect trip requests from protection elements and other inputs to generate
output operands to initiate trip operations. Three pole trips only initiate reclosure if programmed to do so, whereas single
pole trips always automatically initiate reclosure. The TRIP 3-POLE and TRIP 1-POLE output operands can also be used as
inputs to a FlexLogic OR gate to operate the faceplate Trip indicator LED.
5.7.5.1 Three pole operation
In applications where single-pole tripping is not required this element provides a convenient method of collecting inputs to
initiate tripping of circuit breakers, the reclose element and breaker failure elements.
5.7.5.2 Single pole operation
This element is used to:
•
Determine if a single pole operation is to be performed
•
Collect inputs to initiate three pole tripping, the recloser and breaker failure elements
•
Collect inputs to initiate single pole tripping, the recloser and breaker failure elements
•
Assign a higher priority to pilot aided scheme outputs than to exclusively local inputs
The trip output element works in association with other L60 elements that must be programmed and in-service for
successful operation. The necessary elements are: recloser, breaker control, open pole detector, and phase selector. The
recloser must also be in the “Reset” state before a single pole trip can be issued. Outputs from this element are also directly
connected as initiate signals to the breaker failure elements.
At least one internal protection element or digital input representing detection of a fault must be available as an input to
this element. In pilot-aided scheme applications, a timer can be used to delay the output decision until data from a remote
terminal is received from communications facilities, to prevent a three pole operation where a single pole operation is
permitted.
The following settings are available for the trip output element.
TRIP MODE
— This setting is used to select the required mode of operation. If selected to “3 Pole Only” outputs for all three
phases are always set simultaneously. If selected to “3 Pole & 1 Pole” outputs for all three phases are set simultaneously
unless the phase selector or a pilot aided scheme determines the fault is single-phase-to-ground. If the fault is identified as
being AG, BG, or CG only, the operands for the faulted phase are asserted.
TRIP 3-POLE INPUT-1
to
TRIP 3-POLE INPUT-6
— These settings are used to select an operand representing a fault condition
that is not wanted to initiate a single pole operation (for example, phase undervoltage). Use a FlexLogic OR-gate if more
than six inputs are required.
TRIP 1-POLE INPUT-1
to
TRIP 1-POLE INPUT-6
— These settings are used to select an operand representing a fault condition
that is wanted to initiate a single pole trip-and-reclose if the fault is single phase to ground (for example, distance zone 1).
Use a FlexLogic OR-gate if more than six inputs are required. The inputs do not have to be phase-specific as the phase
selector determines the fault type.
TRIP EVENTS:
Disabled
Range: Enabled, Disabled
NOTE
This element must be used in single pole operation applications.
NOTE
To ensure correct operation of the single pole tripping feature, any non-distance protection used for single pole
tripping (such as high-set overcurrent using the instantaneous or directional overcurrent elements) must be
blocked by the
OPEN POLE OP
Φ
A
,
OPEN POLE OP
Φ
B
, or
OPEN POLE OP
Φ
C
operands. For example, instantaneous
overcurrent phase A is blocked by
OPEN POLE OP
Φ
A
operand. This blocking condition is pre-wired for distance
protection.
