Introduction To Elements - GE C30 Instruction Manual

Ur series
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5.1 OVERVIEW
The main characteristics of an element are shown on the element logic diagram. This includes the inputs, settings, fixed
logic, and the output operands generated (abbreviations used on scheme logic diagrams are defined in Appendix F).
FUNCTION setting: This setting programs the element to be operational when selected as "Enabled". The factory
default is "Disabled". Once programmed to "Enabled", any element associated with the function becomes active and all
options become available.
NAME setting: This setting is used to uniquely identify the element.
PICKUP DELAY setting: This setting sets a time-delay-on-pickup, or on-delay, for the duration between the pickup
and operate output states.
RESET DELAY setting: This setting is used to set a time-delay-on-dropout, or off-delay, for the duration between the
Operate output state and the return to logic 0 after the input transits outside the defined pickup range.
BLOCK setting: The default output operand state of all comparators is a logic 0 or "flag not set". The comparator
remains in this default state until a logic 1 is asserted at the RUN input, allowing the test to be performed. If the RUN
input changes to logic 0 at any time, the comparator returns to the default state. The RUN input is used to supervise
the comparator. The BLOCK input is used as one of the inputs to RUN control.
TARGET setting: This setting is used to define the operation of an element target message. When set to "Disabled",
no target message or illumination of a faceplate LED indicator is issued upon operation of the element. When set to
"Self-Reset", the target message and LED indication follow the operate state of the element, and self-resets once the
operate element condition clears. When set to "Latched", the target message and LED indication will remain visible
after the element output returns to logic 0 until a RESET command is received by the relay.
EVENTS setting: This setting is used to control whether the pickup, dropout or operate states are recorded by the
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event recorder. When set to "Disabled", element pickup, dropout or operate are not recorded as events. When set to
"Enabled", events are created for:
(Element) PKP (pickup)
(Element) DPO (dropout)
(Element) OP (operate)
The DPO event is created when the measure and decide comparator output transits from the pickup state (logic 1) to
the dropout state (logic 0). This could happen when the element is in the operate state if the reset delay time is not 0.
Not every operand of a given element in a UR relay generates events, only the major output operands. Elements,
asserting output per phase, log operating phase output only, without asserting the common three-phase operand
event.
5-4
C30 Controller System
5 SETTINGS

5.1.2 INTRODUCTION TO ELEMENTS

GE Multilin

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