? Situate SFT 2841 connected Overview of the software A Parameter setting B C Main points to remember SFT 2841 IN CONNECTED MODE Prepare setting files

? Situate SFT 2841connected

Overview of the softwareA

Parameter settingB

C Main points to remember

SFT 2841 IN CONNECTED MODE

Prepare setting files

SFT2841 connected EN 2007_01.ppt2

Starting the application

Click on the icon

Select the working language

Choose the operating mode:

– connected– point to point via the front panel– via the network

Same access for SFT disconnected


Connection via the network

If required: creation or modification of the network

Connection to Sepam units via the network

Choice of the network

Starting of SFT 2841 software on the chosen station


SFT 2841 expert UMI

The protection and parameter setting data may be saved.

Reports may be edited.



Parameter settingB

C Main points to remember

Parameter setting

PARAMETER SETTING


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


Logipam

– Selection

– Choice in the list

– Apply

– Activate

– Delete

– Download onto the PC

– Automatic updating


Logipam internal resources

LOGIPAM:– internal bits

– counters

– clocks

– delays


General information on connected mode

– Connection

– Sepam type

– Sepam name

– Code operating mode

– Remote control

– Internal clock


General diagnosis

– General characteristics– Software versions

– Sepam status– Clock with time-setting

– Presence of modules

– Monitoring of communication exchanges

Series 20


General diagnosis Series 40



– Presence of modules– Monitoring of

communication exchanges


General diagnosis



– Presence of modules

– Monitoring of communication exchanges

Series 80


Diagnosis: LED, input and output status

– Display of LEDs

– Display of validated inputs

– Display of outputs

– Testing of 3s pulse outputs

Series 40 & 80


Diagnosis: remote indication (TS) status

– Status transmitted via the communication link

Series 40 & 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

Series 80


Measurements: vector diagram

Display– voltage

– current

Select– scale– référence

Series 80


Power and energy measurements

Power measurements– active– reactive– apparent– power factor

Energy measurements– active– reactive

Series 80


Temperature measurements

MET 148 modules

Series 80


Network diagnosis

– Unbalance ratio

– Phase displacement

– Number of trips– Phase– Earth

– Total Harmonic Distortion

Series 80


Network diagnosis

Machine diagnosis– Differential measurements

– Phase angles

– Impedance measurements

– Thermal overload

– Running hours counter

Series 80


Network diagnosis

Tripping contexts– Selection by date

Series 80


Switchgear diagnosis

– Cumulative breaking current

– …

Series 80


Alarm management

Current alarms

– Not acknowledged

– Clear

– Reset

Alarm history– 200 alarms

Series 80


Disturbance recording

– Selection by date

– Voluntary trigger

Series 80

– Recovery of recording


On-line helpSeries 80

On-line help



Parameter settingB

C Main points to remember Main points to remember

MAIN POINTS TO REMEMBER


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.

RETURN

Acquisition of tripping current TRIPI1.


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.

Machine operating assistance functions Current phase displacement

I

I’1

RETURN


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.

V

I

Q

P

+IND

+CAP

-CAP

-IND

RETURN


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.

Io

Vo0

RETURN

I

V


Differential / through current is calculated for the implementation of the differential protection functions 87T and 87M.

It is calculated for each phase by:

Machine operating assistance Differential / through current

IIdiffI

2

IItI

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

It = max ( Iadjusted , I’adjusted ) Idiff = Iadjusted + I’adjusted


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


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


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


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).

Metering functionsDemand phase current

RETURN

A

t

5mn

55A 63A 89A 78A 59A

100A

Demand current

5mn 5mn 5mn 5mn


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

A

t55A 63A 89A 89A 89A

100A

Peak demand current

5mn5mn5mn5mn5mn


Metering functionsPhase-to-phase voltage

RETURN

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.


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


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).

V

I

V

I

RETURN


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.

RETURN

Direction of power flow

Direction of power flow

Documents

? Situate SFT 2841 connected Overview of the software A Parameter setting B C Main points to remember SFT 2841 IN CONNECTED MODE Prepare setting files