Protection Relays NA011 FEEDER PROTECTION RELAY THE ECONOMICAL SOLUTION FOR THE PROTECTION OF LINES AND TRANSFORMERS WITH AUTOMATIC RECLOSER — Application The relay type NA011 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 NA011 protection relay may be shipped with traditional CTs or low power (LPCT) current inputs; for both versions, the residual overcurrent protection can use the measured (CTs or balanced transformer) or the calculated residual current. 52 79 Phase CTs BF Control functions 50 Low power CTs (LPCT) 50 50N 51 METERING - I L1..I L3,I E Alternative - Oscillography - Events & Faults log - Data Logger 51 51N COMMUNICATION - RS232 - Modbus RS485 NA011 - Flyer - 05 - 2012 - Protective & control functions 50/51 50N/51N 79 BF Phase overcurrent Residual overcurrent Automatic recloser Breaker failure

— Phase current inputs — Programming and settings Traditional CTs Three phase current inputs with secondary nominal currents independently selectable at 1 A or 5 A through DIP-switches. Low power CTs Three phase current inputs with primary nominal currents independently selectable through DIP-switches and software. — Residual current input Measured residual current One residual current input with secondary nominal current selectable at 1 A or 5 A through DIP-switches. Calculated residual current Residual current is calculated by the vector sum of the three phase currents, measured by three 1A...

— Mechanical data Mass (flush mounting case) — Insulation tests Reference standards High voltage test 50Hz Impulse voltage withstand (1.2/50 u.s) Insulation resistance Reference standards — EMC tests for interference immunity INPUT CIRCUITS flush, rack 1 MHz damped oscillatory wave Electrostatic discharge Fast transient burst (5/50 ns) Conducted radio-frequency fields Radiated radio-frequency fields High energy pulse Damped oscillatory wave Ring wave Conducted common mode (0...150 kHz) Reference standards Climatic tests Reference standards Mechanical tests Reference standards Safety requirements...

— Digital inputs PROTECTIVE FUNCTIONS — Phase overcurrent - 50/51 I> Element • I> Curve type (I>Curve) DEFINITE, IEC/BS A, B, C, ANSI/IEEE MI, VI, EI • ICLP > Activation time (t CLP >def ) 0.00...100.0 s • I> Reset time (t >RES) 0.00...100.0 s Denite time • 50/51 First threshold denite time (I> def ) 0.100...20.0 In • I> def within CLP (ICLP>def ) 0.100...20.0 In • I> def Operating time (t > def ) 0.03...10.00 s Inverse time • 50/51 First threshold inverse time (I>inv) 0.100...2.50 In • I>inv within CLP (ICLP>inv) 0.100...10.0 In • I>inv Operating time (t >inv) 0.02...60.0 s I>> Element • ICLP...

FRONT VIEW REAR VIEW SIDE VIEW Traditional CT inputs Low power CT inputs FLUSH MOUNTING CUTOUT IDENTIFICATION LABEL Keys Q (CB open) antf|| <CB close>

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