5-4 B90 Low Impedance Bus Differential System GE Multilin5.1 OVERVIEW 5 SETTINGS5(EQ 5.1)For wye-connected VTs, the secondary nominal voltage (1 pu) would be:(EQ 5.2)Many settings are common to most elements and are discussed below:• FUNCTION setting: This setting programs the element to be operational when selected as “Enabled”. The factorydefault is “Disabled”. Once programmed to “Enabled”, any element associated with the function becomes active and alloptions become available.• NAME setting: This setting is used to uniquely identify the element.• PICKUP setting: For simple elements, this setting is used to program the level of the measured parameter above orbelow which the pickup state is established. In more complex elements, a set of settings may be provided to define therange of the measured parameters which will cause the element to pickup.• PICKUP DELAY setting: This setting sets a time-delay-on-pickup, or on-delay, for the duration between the pickupand operate output states.• RESET DELAY setting: This setting is used to set a time-delay-on-dropout, or off-delay, for the duration between theOperate 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 comparatorremains in this default state until a logic 1 is asserted at the RUN input, allowing the test to be performed. If the RUNinput changes to logic 0 at any time, the comparator returns to the default state. The RUN input is used to supervisethe 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 theoperate element condition clears. When set to “Latched”, the target message and LED indication will remain visibleafter 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 theevent 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) tothe dropout state (logic 0). This could happen when the element is in the operate state if the reset delay time is not 0.1380014400---------------- 120 115 V=1380014400---------------- 1203---------- 66.4 V=
