Sepam - HV/MV Protection and control units (ENG) - Trinet

OverfrequencyANSI code 81function n° F57X 1 ≤ X ≤ 2OperationThe protection may be supplied in different ways:c by U21 and U32, if the phase VT ratio numberparameter is set to 3U. It picks up if the positivesequence voltage frequency is greater than the setpoint Fs and if U21 voltage is greater than 20%(+ 5%) of Un,c by a single voltage, phase-to-neutral or phase-tophase,if the phase VT ratio number parameter is setto V or 1U. It picks up if the frequency is greater thanthe set point Fsand if the voltage is greater than 35% (± 5%)of Vn or Un respectively.It includes a definite time delay T.Commissioning, settingCheck:c the connections,c the positions of the microswitches SW associatedwith the voltage inputs,c the general parameters in the status menu.Set the following:c Fs set point: Fs is set in Hertz.The 999 Hz setting disables the protection:all the outputs are set to zero.c T time delay.0.150.1(1)curve for a measurement taken from a singlephase-to-neutral or phase-to-phase voltage (U21).(2)curve for a measurement taken on U21 and U32.1501401301201101009080706050403020105060accuracy in Hzt (in ms)52625565(1)(2)HzT = 100 msT instantaneous0.5 1 2 3 4 ∆Fin HzTime delay accuracy curve0* or S35, S25 for earlier versions.** function available as of version 9802 SFT 2800.Block diagramU32U21SensorsCharacteristicsFs set pointsettingresolutionaccuracy (1)U21 and U32 measurementU21 measurementpick-up-drop out differenceT time delaysettingaccuracy (1)resolutioncharacteristic times (1)instantaneous tripping timetime delayed tripping timememory timefault recognition timereset timeoutputs available for program logicinstantaneoustime delayedU21 < U minVdU > U min (1)This protection is related to the voltages of the VTsconnected to the following connector:SepamconnectorS36* 4A (1)S26* 3Aremote reading, remote setting** (2)function code F57F > Fs(1)U min = 20% Un if phase VT number set up is equal to 3U,35% Un if phase VT number set up is equal to 1U,35% Un if phase VT number set up is equal to V.(1)3A connector for S36*TR and S36TS models.If there is only one sensor (phase-to-neutral or phaseto-phasevoltage), the voltage signal is connectedto terminals 4 and 5 of the connector, whateverthe phase.50 to 55 Hz or 60 to 65 Hz0.1 Hz0.1 Hz across the dynamic rangemeasurementsee curve0.2 Hz ± 0.1 Hz100 ms to 655 s± 2%, or 40 ms (see curve)10 ms or 1 digitsee curveT< 65 ms< 65 ms< 85 msF57X/1F57X/2F57X/357hidentification number X (3)&F57X/2F57X/1F57X/3parameters Fs set point unit: 0.1 x Hz(order of parameters) T time delay unit: 10 x ms(1)in reference conditions (IEC 60255-6) and df/dt < 3 Hz/s.(2)the data formats are defined in the manuals which describe each communication protocol.(3)the number of protection function modules depends on the type of Sepam 2000.T0Protection functions2/51