NA10 FEEDER PROTECTION RELAY THE BASIC SOLUTION FOR FEEDERS AND TRANSFORMERS PROTECTION The relay type NA10 can be used in radial networks as feeder or power transformer protection. In solidly grounded systems the residual overcurrent protection can be used on feeders of any length, while in ungrounded or Petersen coil and/or resistance grounded systems, the residual overcurrent protection can be used on feeders of small length in order to avoid unwanted trippings due to the capacitive current contribution of the feeder on external ground fault. The relay complies with CEI 0-16 requirements. - Protective & control functions 50N/51N Control functions METERING - I L1..I L3,I E - Oscillography - Events & Faults log COMMUNICATION - RS232 - Modbus RS485 - Modbus TCP/IP - IEC 870-5-103/DNP3 Phase overcurrent Residual overcurrent Breaker failure CT supervision Trip circuit supervision

— Measuring inputs Three phase current inputs and one residual current input, with nominal currents independently selectable at 1 A or 5 A through — Binary inputs Two orfive binary inputs are available with programmable active state (active-ON/active-OFF) and programmable timer (active to OFF/ON or ON/OFF transitions). Several presettable functions can be associated to each input. According to the hardware configurations, the NA10 protection relay can be shipped in various case styles depending on the required mounting options (flush, projecting mounting, rack or with separate operator panel)....

— Self diagnostics — Control and monitoring Several predened functions are implemented: • Circuit Breaker commands and diagnostic. • Activation of two set point proles. • Phase CTs monitoring (74CT). • Logic selectivity. • Cold load pickup (CLP) with block or setting change. • Trip circuit supervision (74TCS). • Second harmonic restraint (inrush). • Remote tripping. User dened logic may be customized according to IEC 61131-3 standard protocol (PLC). Circuit Breaker commands and diagnostic Several diagnostic, monitoring and control functions are provided: • Health thresholds can be set; when the...

SPECIF ICAT IONS INPUT CIRCUITS — Auxiliary power supply Uaux — Mechanical data Mounting: ush, projecting, rack or separated operator panel Mass (ush mounting case) 2.0 kg — Insulation tests Reference standards High voltage test 50Hz Impulse voltage withstand (1.2/50 μs) Insulation resistance — Voltage dip and interruption Reference standards — EMC tests for interference immunity 1 MHz damped oscillatory wave Electrostatic discharge Fast transient burst (5/50 ns) Conducted radio-frequency elds Radiated radio-frequency elds High energy pulse Magnetic eld 50 Hz Damped oscillatory wave Ring wave...

— Relay output timers Minimum pulse width (t TR) PROTECTIVE FUNCTIONS — Thermal protection with RTD thermometric probes - 26 Alarm • Alarm threshold θALx (x=1...8) • Operating time t θALx (x=1...8) Trip • Trip threshold θ>x (x=1...8) • Operating time t θ >x (x=1...8) Note: The element becomes available when the MPT module is enabled and connected to Thybus — Phase overcurrent - 50/51 I> Element • I> Curve type (I>Curve) DEFINITE IEC/BS A, B, C, ANSI/IEEE MI, VI, EI RECTIFIER, I2t or EM • ICLP > Activation time (t CLP>) 0.00...100.0 s • I> Reset time delay (t > RES) 0.00...100.0 s Denite time...

Recording mode • Start/Trip of enabled protection or control element • Binary inputs switching (OFF/ON or ON/OFF) • Setting changes • Auxiliary supply Power UP/Power DOWN Data recorded: • Counter (resettable by ThySetter) 0...109 • Cause binary input/trip/setting change/Power ON/OFF •Time stamp Date and time Recording mode circular • Output relays of enabled protection or control element (OFF-ON) — Digital Fault Recorder (Oscillography) • External trigger (binary inputs) Data recorded: • Counter (resettable by ThySetter) • Time stamp • Fundamental RMS phase currents • Fundamental RMS residual...

— Connection diagram example MODULO 4 RELE’ + 8 INGRESSI DIGITALI 4 RELAYS + 8 BINARY INPUTS MODULE Supervision unit BINARY INPUTS CURRENT INPUTS

DIMENSIONS FRONT VIEW START TRIP FLUSH MOUNTING PROJECTING MOUNTING FLUSH MOUNTING PROJECTING MOUNTING (Separate operator panel) FLUSH MOUNTING PROJECTING MOUNTING (Separate operator panel) SEPARATE OPERATOR PANEL RACK MOUNTING PROJECTING MOUNTING (Stand alone) FLUSH MOUNTING CUTOUT START TRIP