Related Manuals for Thytronic SME2
Summary of Contents for Thytronic SME2
- Page 1 SME2 DIRECTIONAL EARTH FAULT AND SHORT-CIRCUIT DETECTOR MANUAL 51 67 SME2 51 67 SME2 51 67 SME2 SME2 - Manual - 10 - 2011...
- Page 2 The correct detection of the fault direction also occurs in the presence of intermittent faults. The SME2 device checks the voltage of the three phases of the MT line and indicates whether it is ON or OFF; a current converter is also available with an impressed current output of 4...20 mA for sending the phase current measurement to the remote control terminal.
- Page 3 F U N C T I O N C H A R A C T E R I S T I C S The SME2 device performs its fault detection functions based on measure of line currents and phase voltages; two phase currents, three phase voltages and the residual current are detected.
- Page 4 3 of the MB terminal board. Current converter The SME2 device is provided with an impressed current analogue output for sending the phase cur- rent measure to the remote control unit. Signal 4...20 mA is available for transfer to the remote control unit on terminals 4 (M1 connected to the positive auxiliary power) and 7 (M2 of terminal board MB).
- Page 5 0.25s Voltage presence LED (59) Voltage presence (59) Led indicators management The SME2 device is provided with 8 indicator LEDs: • three green LEDs indicating that V4, V8, V12 phase voltages are ON, • a white LED indicating the direction reversal for the directional earth protection, •...
- Page 6 Residual current transformer on isolated cable • SME2 device Projecting Protection degree IP31 SME2 mounting position vertical Mass: • Phase current transformer 0.3 kg • Residual current transformer 0.7 kg • SME2 device 0.9 kg SME2 - Manual - 10 - 2011...
- Page 7 Breaking capacity (24 V, L/R = 40 ms) 0.2 A Minimum switching load 300 mW (5 V/5 mA) Current converter Operating range 0...500 A Output current 4...20 mA Accuracy Max load 750 Ω Maximum response time 300 ms SME2 - Manual - 10 - 2011...
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Page 8: Communication Interface
Note: The 59 protection trips when the value of at least one phase voltage is greater than 0.8 V and is reset when the voltage of all three phases is less than 0.2 V SME2 - Manual - 10 - 2011... - Page 9 NO TRIP TRIP 90˚ 90˚ 270˚ 270˚ 157.5˚ 157.5˚ TRIP NO TRIP 255˚ 240˚ > 180˚ 180˚ Polar tripping characteristic (67) with reversing direction OFF Polar tripping characteristic (67) with reversing direction ON SME2 - Manual - 10 - 2011...
- Page 10 The sensor fi tting direction should be such as to have said references arranged towards the upper side of the MV compartment (line outgoing side downstream of switch). • fasten the core using the insulating clamps supplied. Isolated cables Mounting on unshielded cables Mounting on shielded cables SME2 - Manual - 10 - 2011...
- Page 11 SME2 panel, so as to prevent the cables from exerting any stress on the terminals.
- Page 12 The ThySetter sw is a “browser” of data (setting, measure, etc..); it implements an engine that is afford to rebuild the menu set up and the relationships to data concerning all Thytronic protective relays by means of XML fi les.
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Page 13: Connection Diagram
CONNECTION DIAGRAM MB terminal block normal direction of power capacitive to remote control unit divider I> current sensor MA terminal block I> current sensor SME2 IE> current sensor SME2 DEVICE SME2 - Manual - 10 - 2011... -
Page 14: Current Sensors
CURRENT SENSORS CUTOUT Ø 5.5 Ø 5.5 Ø 5.5 Ø 5.5 SME2 - Manual - 10 - 2011... - Page 15 M A I N T E N A N C E The SME2 relays do not require any particular maintenance; all circuits use high quality static com- ponents, the subassembly products undergo dynamic checks on their functioning before the fi nal assembling of the complete equipment.
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