08 Sepam- Understand Sepam Control Logic

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Understand Sepam control logic

Schneider Electric 2- Field Services Division Operation training for electrical engineer - NESTLE Viet nam – Tri An Plant

PROVIDING ENGINEERING FOR OPERATION TRAINING MV SWITCHGEAR WITH SEPAM RELAY AND POWER QUALITY DISTURBANCES

Understand Sepam control logicSepam Control and Monitoring functions- General Sepam performs the control and monitoring functions:

Predefined and fit the applications most frequently used ready to use, simple parameter setting: Local annunciation, Circuit breaker/

contactor control, Latching / acknowledgement Customized functions by using the SFT2841 software:

can be adapted for particular needs by logic equation editor, Logipam software (by expert), customization of the control matrix, LEDs and display messages.

Operating principle: 3 phases1. Acquisition of input data: protections, inputs, remote control via the

communication (TC)2. Actual logic processing of the control and monitoring function3. Utilization of the processing results: activating output, message, LED, remote

indicator via the communication (TS)



Understand Sepam control logicSepam Control and Monitoring functions- GeneralOperating principle:



Understand Sepam control logicSepam Control and Monitoring functions- Logic inputs and outputs Can be assigned to predefined functions. May be used for the SFT2841 customization functions May also be inverted for undervoltage type operation. A default input / output assignment is proposed for the most frequent uses.

by clicking on the "Standard assignment" button in SFT2841 software



Understand Sepam control logicSepam Control and Monitoring functions- Logic inputs and outputs



Understand Sepam control logicSepam Control and Monitoring functions- Circuit breaker / contactor control This function controls the breaking device (ANSI code 94/69)

tripping on output O1 protection unit (units configured to trip the circuit breaker) logic discrimination remote control via the communication link external protection open order by logic input

closing on output O11 recloser remote control via the communication link closing control by logic input

inhibition of closing on output O2 trip circuit fault (TCS) SF6 fault inhibit order by logic input.



Understand Sepam control logicSepam Control and Monitoring functions- Circuit breaker / contactor control

Circuit breaker / contactor control- Associated functions Circuit breaker / contactor control with lockout function (ANSI 86)

grouping of all tripping conditions and breaking device control latching of the tripping order with inhibition of closing until the cause of tripping

disappears and is acknowledged by the user indication of the cause of tripping: local & remote

Latching/acknowledgment the tripping outputs all the protection functions and all the logic inputs may be latched individually. The logic outputs set up in pulse mode Latched data are saved in the event of a power failure All latched data may be acknowledged locally on the UMI, or remotely by means of

a logic input or via the communication link Associated with the "Circuit breaker / contactor control" function.




Circuit breaker / contactor control- Associated functions TC/circuit breaker position discrepancy

This function detects a discrepancy between the last remote control order received and the actual position of the circuit breaker.

Circuit breaker / contactor control- Associated functions Tripping

It indicates whether a Sepam internal or external protection has tripped.




Circuit breaker / contactor control- Associated functions Trip circuit supervision and open / closed matching (With MES option)

designed for trip circuits with shunt trip units. The function detects: circuit continuity loss of supply mismatching of position contacts

designed for trip circuits with with undervoltage trip units. The function detects: mismatching of position contacts, coil supervision being unnecessary in this case

1. The function inhibits closing of the breaking device2. The function is activated if inputs I11 and I12 are set respectively as circuit breaker "open position" and circuit breaker "closed position".




Circuit breaker / contactor control- Associated functions Open and close order supervision

Following a circuit breaker open or close order, after a 200 ms time delay, the circuit breaker has actually changed status.

If the circuit breaker status does not match the last order sent, a "Control fault" message and remote indication TS108 are generated.



Understand Sepam control logicSepam Control and Monitoring functions- Logic discrimination For Radial network (ANSI code 68) full tripping discrimination a substantial reduction indelayed tripping of the circuit breakers located nearest the

source.



Understand Sepam control logicSepam Control and Monitoring functions- Disturbance recording triggering The recording of analog and logic signals may be triggered by different events,

according to control matrix parameter setting or by manual action: triggering by the grouping of all pick-up signals of the protection functions in service triggering by the outputs of selected protection functions triggering by selected logic inputs triggering by selected outputs Vx (logic equations) manual triggering by a remote control order (TC10) manual triggering via the SFT2841 software tool.



Understand Sepam control logicSepam Control and Monitoring functions- Switching of groups of settings Switching from one group of settings to another makes it possible to adapt the

protection characteristics to suit the electrical environment of the application There are two groups of settings, group A / group B, for:

the phase overcurrent the earth fault directional phase overcurrent and directional earth fault protection functions

The setting switching mode is determined by parameter setting: switching according to the position of logic input I13 (0 = group A, 1 = group B) switching by remote control (TC3, TC4) forced group A or group B.



Understand Sepam control logicSepam Control and Monitoring functions- Local indication (ANSI code 30) Events may be indicated on the front panel of Sepam by:

appearance of a message on the display of the advanced UMI lighting up of one of the 9 yellow signal lamps

Predefined messages: in English, factory messages, not modifiable in the local language, according to the version delivered

Personalized user message editor in SFT2841



Understand Sepam control logicSepam Control and Monitoring functions- Control matrix The control matrix is used for simple assignment of :

the logic outputs and signal lamps to information produced by the protection units program logic and logic inputs

The matrix may also be used to display the alarms connected to the information: in English, factory messages, not modifiable in the local language, according to the version delivered

Guarantees the consistency of the parametersetting with the predefined functions



Understand Sepam control logicSepam Control and Monitoring functions- Logic equations to configure simple logic functions by combining data received from the

protectionfunctions or logic inputs By using logic operators (AND, OR, XOR, NOT) and time delays, new processing

operations and indications may be added to the existing ones

The logic functions produce outputs that may be used:

in the matrix to control relay outputs, light up LEDs or display new messages

in the protection functions to create new inhibition or reset conditions

in circuit breaker control to add cases of circuit breaker tripping, closing or inhibition

in disturbance recording to record particular logic data.



Understand Sepam control logicSepam Control and Monitoring functions- Self-tests and fail-safe position

Sepam Self-tests The self-tests are run when Sepam is initialized

and/or during its operation.. List of self-tests which place Sepam in the fail-

safe position

List of self-tests which do not place Sepam in the fail-safe position



Understand Sepam control logicSepam Control and Monitoring functions- Self-tests and fail-safe position

Sepam in the Fail-safe position All the output relays are forced to the idle state All protection functions are inhibited The watchdog output indicates failure A red LED on the Sepam front panel is on and a diagnostic message appears on the Sepam display

Minor failure: Sepam switches to downgraded operation. Major failure: Sepam switches to the fail-safe position and attempts a restart during which it again runs its

self-tests. There are 2 possible scenarios: the internal failure is still present. It is a permanent failure. the internal failure is no longer present. It is a transient failure.

Using the watchdog The watchdog output activates a system alarm. To ensure that Sepam protection functions are working correctly.


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08 Sepam- Understand Sepam Control Logic

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