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SFT 2841 IN CONNECTED MODE

SFT 2841 IN CONNECTED MODE. Prepare setting files. Click on the icon. Select the working language Choose the operating mode: connected point to point via the front panel via the network. Starting the application. Same access for SFT disconnected. Connection via the network.

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SFT 2841 IN CONNECTED MODE

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  1. SFT 2841 IN CONNECTED MODE Prepare setting files

  2. Click on the icon Select the working language Choose the operating mode: connected point to point via the front panel via the network Starting the application Same access for SFT disconnected

  3. Connection via the network • Choice of the network • If required: creation or modification of the network • Connection to Sepam units via the network • Starting of SFT 2841 software on the chosen station

  4. SFT 2841 expert UMI • The protection and parameter setting data may be saved. • Reports may be edited.

  5. PARAMETER SETTING Parameter setting

  6. Current operation • Metering and operating data • alarm messages • tripping current • number of operations • logic status of inputs, outputs and LEDs • Parameter setting • of each protection function • of control logic • of general installation and Sepam data

  7. Logipam • Selection • Choice in the list • Apply • Activate • Delete • Download onto the PC • Automatic updating

  8. Logipam internal resources • LOGIPAM: • internal bits • counters • clocks • delays

  9. General information on connected mode • Connection • Sepam type • Sepam name • Code operating mode • Remote control • Internal clock

  10. Series 20 General diagnosis • General characteristics • Software versions • Sepam status • Clock with time-setting • Presence of modules • Monitoring of communication exchanges

  11. Series 40 General diagnosis • General characteristics • Software versions • Sepam status • Clock with time-setting • Presence of modules • Monitoring of communication exchanges

  12. Series 80 General diagnosis • General characteristics • Software versions • Sepam status • Clock with time-setting • Presence of modules • Monitoring of communication exchanges

  13. Series 40 & 80 Diagnosis: LED, input and output status • Display of LEDs • Display of validated inputs • Display of outputs • Testing of 3s pulse outputs

  14. Series 40 & 80 Diagnosis: remote indication (TS) status • Status transmitted via the communication link

  15. Series 80 Measurements Network measurements: • Current measurements • rms • demand • maximum • residual • additional • Voltage measurements • phase-to-neutral • phase-to-phase • positive-sequence • negative-sequence • Frequency measurement

  16. Series 80 Measurements: vector diagram • Display • voltage • current • Select • scale • référence

  17. Series 80 Power and energy measurements • Power measurements • active • reactive • apparent • power factor • Energy measurements • active • reactive

  18. Series 80 Temperature measurements • MET 148 modules

  19. Series 80 Network diagnosis • Unbalance ratio • Phase displacement • Number of trips • Phase • Earth • Total Harmonic Distortion

  20. Series 80 Network diagnosis • Machine diagnosis • Differential measurements • Phase angles • Impedance measurements • Thermal overload • Running hours counter

  21. Series 80 Network diagnosis • Tripping contexts • Selection by date

  22. Series 80 Switchgear diagnosis • Cumulative breaking current • …

  23. Series 80 Alarm management • Current alarms • Not acknowledged • Clear • Reset • Alarm history • 200 alarms

  24. Series 80 Disturbance recording • Selection by date • Voluntary trigger • Recovery ofrecording

  25. Series 80 On-line help • On-line help

  26. MAIN POINTS TO REMEMBER Main points to remember

  27. Network diagnosis functionsTripping current • This function gives the RMS values of the phase currents and residual currents at time of the last trip. • The measurement is defined as the maximum RMS value measured during a 30 ms interval after the activation of the O1 output. Acquisition of tripping current TRIPI1. RETURN

  28. I  I’1 Machine operating assistance functions Current phase displacement • Current phase displacement between the main phase currents (I) and additional phase currents (I') (1, 2, 3) is calculated for each phase. • The angle is measured in the clockwise direction. • The information is used to check Sepam wiring when 87T protection functions are implemented. RETURN

  29. Q V -CAP +IND  I P -IND +CAP Metering functionsPower factor (Cos) • This function gives the phase displacement between the phase currents and the phase-to-neutral voltages. • The + and - signs and the IND (inductive) and CAP (capacitive) indications give the direction of power flow and the type of load. RETURN

  30. Io Vo 0 I V  Network diagnosis functions Phase displacement • This function gives: • phase displacement measured between the residual voltage and residual current in the trigonometric direction • phase displacement between the V1, V2, V3 voltages and I1, I2, I3 currents respectively, in the trigonometric direction • The measurements are used during Sepam commissioning to check that the voltage and current inputs are wired correctly. • The angle is positive when the current is leading compared to the voltage (trigonometric direction). • the angle is modified by 180° by the setting incomer / feeder. RETURN

  31. Idiff = Iadjusted + I’adjusted It = max ( Iadjusted , I’adjusted ) Machine operating assistance Differential / through current • Differential / through current is calculated for the implementation of the differential protection functions 87T and 87M. • It is calculated for each phase by: • When a transformer is used (87T), the Idiff / It calculation takes into account the vector shift and transformation ratio.. • The Idiff / It value is expressed with respect to In, the rated current of the main channels. RETURN

  32. Metering functionsPhysical values measured • Sepam measures the following physical values: • phase current (3I) • residual current (Io) • phase voltage (3V) • residual voltage (Vo) • Each measured signal is processed by Sepam to produce all the values necessary for the metering, diagnosis and protection functions. RETURN

  33. Metering functionsRMS measurement • RMS measurement is only used by the phase current metering function and for the thermal overload protection function (49). The RMS values take into account harmonics up the the 13th. • For all other metering and diagnosis functions, the H1 fundamental 50 Hz or 60 Hz component is used. RETURN

  34. Metering functionsResidual current • This function gives the RMS value of the residual current obtained by: • measurement: Io • calculation of the sum of the phase currents: Io • Accuracy at Ino: ±1%. • Accuracy ± 2% from 0.3 to 1.5 Ino • Accuracy ± 3% from 0.1 to 0.3 Ino • The measurement range extends to 40 Ino when Io measurement is used. In the other cases, the range extends to 20 Ino. RETURN

  35. Demand current A 5mn 5mn 5mn 5mn 5mn 100A t 55A 63A 89A 78A 59A Metering functionsDemand phase current • Resetting to zero: • by the clear key on the display unit if one of the two screens is displayed, • by the clear command in the SFT2841 software, • via the communication link (remote control order TC4). RETURN

  36. Peak demand current A 5mn 5mn 5mn 5mn 5mn 100A t 55A 63A 89A 89A 89A Metering functionsPeak demand current • At the end of each integration period, i.e. once the new demand current values are available, the function determines the greatest demand current value obtained since the last reset. RETURN

  37. Metering functionsPhase-to-phase voltage • This function gives the RMS value of the 50 or 60 Hz component of the phase-to-phase voltages. • U21 voltage between phases 2 and 1 (U21=V1-V2) • U32 voltage between phases 3 and 2 (U32=V2-V3) • U13 voltage between phases 1 and 3 (U13=V3-V1) • by calculation when 3 phase-to-earth VTs are connected, • by measurement (U21 and U32) and by calculation (U13) when 2 phase-to-phase VTs are connected, • by measurement (U21) when only one phase-to-phase VT is connected, in which case the U32 and U13 voltages are not available. RETURN

  38. Metering functionsFrequency • This measurement is based on: • U21 if only one phase-to-phase voltage is available, • positive sequence voltage if the U21 and U32 measurements are available. • The frequency is not displayed (replaced by ****) if: • U21 or Vd is less than 40% of Un. • frequency is out of range. • Accuracy at Unp: ±0.01Hz • 25 to 65 Hz range Sepam series40 and 80 • 45 to 55 Hz if 50Hz Sepam series 20 • 55 to 65 Hz if 60Hz Sepam series 20 RETURN

  39. V  I Metering functionsPower factor (Cos) • Capacitive/inductive circuit: • If V is leading compared to I, in the trigonometric (counter-clockwise) direction, then  is positive. • A capacitive (CAP) circuit is one in which the current is leading compared to the voltage ( <0). • An inductive (IND) circuit is one in which the current is lagging compared to the voltage ( >0). CAP  I IND V RETURN

  40. Metering functionsActive, reactive and apparent power • For an incoming circuit: • Power supplied to the busbars is positive. • Power supplied by the busbars is negative. • For an outgoing circuit: • Power supplied to the busbars is negative. • Power supplied by the busbars is positive. Direction of power flow Direction of power flow P+ P+ RETURN

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