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TRICONEX AO3481 Output module

Voltage controlled overcurrent (Imax-Umin) A. Application Phase fault protection of generators with rapidly decaying fault current such that a normal time overcurrent function could reset before its delay had expired. B. Features
stores the maximum current value after pick-up
resets either after recovery of the system voltage or after tripping
processes the positive-sequence component of the voltage
insensitive to DC component and harmonics
single or three-phase measurement with detection of the highest phase value in the three-phase mode. C. Inputs and outputs I. C.t./v.t. inputs:
current
voltage II. Binary inputs:
blocking III. Binary outputs:
pick-up
tripping IV. Measurements:
current amplitude
positive-sequence voltage.

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).

Setting instructions

 Settings: Current pick-up Current Delay Delay Undervoltage Hold-Voltage Reset delay Hold-Time The voltage controlled overcurrent function comprises a definite time overcurrent unit, which latches when the undervoltage unit responds. The protection is intended for generators and generator/transformer units, for which a fault current can fall below the pick-up of the overcurrent protection before it has opportunity to trip. Apart from the influence of a DC component, a decaying AC component can only occur on a generator, the steady-state fault current of which is very low, because of the large synchronous reactance Xd typical of modern generators (see Fig. 3.5.7.1). This function is largely insensitive to DC component and harmonics.

Hold-Voltage Voltage below which the pick-up status latches, even if the current falls below the pick-up setting. Hold-Time defines how long the tripping signal latches when the voltage condition is fulfilled. NrOfPhases defines whether single or three-phase measurement. CurrentInp defines the current input channel. All current I/P's may be selected. In the case of three-phase measurement, the first channel (R phase) of the group of three selected must be specified. VoltageInp Defines the voltage input channel. All three-phase voltage I/P's may be selected. A phase-tophase voltage must be used for measurement. This is derived from the set phase and the (cyclically) lagging phase.