GE Multilin F35 Multiple Feeder Protection System 5-1995 SETTINGS 5.8 INPUTS AND OUTPUTS55.8INPUTS AND OUTPUTS 5.8.1 CONTACT INPUTSPATH: SETTINGS INPUTS/OUTPUTS CONTACT INPUTSThe contact inputs menu contains configuration settings for each contact input as well as voltage thresholds for each groupof four contact inputs. Upon startup, the relay processor determines (from an assessment of the installed modules) whichcontact inputs are available and then display settings for only those inputs.An alphanumeric ID may be assigned to a contact input for diagnostic, setting, and event recording purposes. The CON-TACT IP X On ” (Logic 1) FlexLogic operand corresponds to contact input “X” being closed, while CONTACT IP X Off corre-sponds to contact input “X” being open. The CONTACT INPUT DEBNCE TIME defines the time required for the contact toovercome ‘contact bouncing’ conditions. As this time differs for different contact types and manufacturers, set it as a maxi-mum contact debounce time (per manufacturer specifications) plus some margin to ensure proper operation. If CONTACTINPUT EVENTS is set to “Enabled”, every change in the contact input state will trigger an event.A raw status is scanned for all Contact Inputs synchronously at the constant rate of 0.5 ms as shown in the figure below.The DC input voltage is compared to a user-settable threshold. A new contact input state must be maintained for a user-settable debounce time in order for the F35 to validate the new contact state. In the figure below, the debounce time is setat 2.5 ms; thus the 6th sample in a row validates the change of state (mark no. 1 in the diagram). Once validated (de-bounced), the contact input asserts a corresponding FlexLogic operand and logs an event as per user setting.A time stamp of the first sample in the sequence that validates the new state is used when logging the change of the con-tact input into the Event Recorder (mark no. 2 in the diagram).Protection and control elements, as well as FlexLogic equations and timers, are executed eight times in a power systemcycle. The protection pass duration is controlled by the frequency tracking mechanism. The FlexLogic operand reflectingthe debounced state of the contact is updated at the protection pass following the validation (marks no. 3 and 4 on the fig-ure below). The update is performed at the beginning of the protection pass so all protection and control functions, as wellas FlexLogic equations, are fed with the updated states of the contact inputs. CONTACT INPUTS CONTACT INPUT H5aMESSAGE CONTACT INPUT H5a ID:Cont Ip 1Range: up to 12 alphanumeric charactersMESSAGE CONTACT INPUT H5aDEBNCE TIME: 2.0 msRange: 0.0 to 16.0 ms in steps of 0.5MESSAGE CONTACT INPUT H5aEVENTS: DisabledRange: Disabled, Enabled↓ CONTACT INPUT xxx CONTACT INPUT THRESHOLDSMESSAGE Ips H5a,H5c,H6a,H6cTHRESHOLD: 33 VdcRange: 17, 33, 84, 166 VdcMESSAGE Ips H7a,H7c,H8a,H8cTHRESHOLD: 33 VdcRange: 17, 33, 84, 166 Vdc↓MESSAGE Ips xxx,xxx,xxx,xxxTHRESHOLD: 33 VdcRange: 17, 33, 84, 166 Vdc
