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NI SCXI-1104C Voltage module

Response after decay of the memorised voltage The voltage measured by the protection can quickly decay to almost zero for a close fault and make determining direction unreliable. For this reason, the function includes a voltage memory feature and for the first 200 milliseconds after the incidence of an overcurrent, the voltage measured immediately before the fault is used as reference to determine fault direction. After this time, the last valid direction is used for an adjustable period (see next paragraph). “MemDirMode” provides facility for setting how the protection must respond after this time or in the event that the circuitbreaker is closed onto a fault and no voltage could be memorised beforehand. The two possible settings are the protection can trip or it can block. Time during which the memorised direction is valid The “MemDuration” setting determines how long the last valid direction measurement shall be used. The setting should be as short as possible (200 ms) when the function is being used as backup for a distance function in an HV power system, because an actually measured voltage is only available during this time and therefore it is only possible to detect a reversal of direction during this time. For longer settings, the last valid power direction is used instead of the actually memorised voltage.

Peak value overcurrent (Current-Inst) 

A. Application
General current monitoring with instantaneous response (over and under)
Current monitoring where insensitivity to frequency is required (over and under). B. Features
processes instantaneous values and therefore fast and largely independent of frequency
stores the peak value following pick-up
no suppression of DC component
no suppression of harmonics
single or three-phase measurement
maximum value detection in the three-phase mode
adjustable lower frequency limit fmin. C. Inputs and outputs I. C.t./v.t. inputs:
current II. Binary inputs:
blocking III. Binary outputs:
pick-up
tripping IV. Measurements:
current amplitude (only available if function trips)

Explanation of parameters: RunOnCPU defines the processing unit which runs the function. ParSet 4..1 Parameter for determining in which set of parameters a particular function is active (see Section 5.11.). Trip 01-08 defines the tripping channel activated by the tripping O/P of the function (matrix tripping logic). Trip 09-16 corresponds to Trip 01-08 (providing tripping unit fitted). Trip 17-24 corresponds to Trip 01-08 (providing tripping unit fitted).