Protection Relays NC020 FILTER & CAPACITOR BANK PROTECTION RELAY THE LOW COST SOLUTION FOR HARMONIC FILTERS AND CAPACITOR BANK — Application In recent years the harmonic producing part of total load has increased continuously because of the massive usage of power electronic in all the voltage levels. Thyristor convertors, frequency convertors, thyristor switches and static var compensator, such as thyristor controlled reactors (TCR) and thyristor switched capacitors (TSC), are commonly adopted in industrial applications and power utilities. Filter capacitor banks consist of capacitor bank and series connected air core. Their task is to absorb the harmonic currents generated by loads and all above mentioned power electronic devices. The aim of NC020 is to provide a reliable and cost effective solution for such an application granting capacitor bank safe operations. The capacitor banks may have the following congurations: • Single Wye grounded. • Single Wye ungrounded (with a resistor on the output of the neutral unbalance voltage transformer in order to develop the appropriate input current for the unbalance protection). • Double Wye ungrounded. A suitable compensation method is provided to compensate the inherent unbalance neutral current. Protection 50/51 RMS is based on true RMS value measurement of the three phase currents (fundamental and harmonics up to the 23th). The peak capacitor voltage is achieved for any phase by means of the sum of the fundamental frequency voltage and its harmonics (up to twenty-third order), calculated from the phase currents. Hence it is an innovative key against the dangerous pick voltages for those applications without VTs for the direct measurement of the capacitor voltages. NC020 52 BF 50/51 - Protective & control functions 50/51(RMS) 50N/51N 59H TD METERING - I L1...I L3,I L1RMS...I L3RMS,I EC,I N,... - Oscillography - Events&Faults recorder 46N Control functions COMMUNICATION - RS232 - Modbus RS485 46N Neutral unbalance overcurrent with inherent unbalance compensation 50/51 Fundamental frequency phase overcurrent 50/51(RMS) True RMS phase overcurrent 50N/51N Computed residual overcurrent 59H Peak overvoltage BF Breaker Failure TD Discharge Timer NC020 - Flyer - 05 - 2012

— Measuring inputs — Cold Load Pickup (CLP) • Three phase current inputs and one unbalance neutral current input, with nominal currents independently selectable at 1 A or 5 A through DIP-switches. — Output relays Four output relays are available (two changeover contacts); each relay may be individually programmed as normal state (normally energized or de-energized) and reset mode (manual or automatic). A programmable timer is provided for each relay (minimum pulse width). The user may program the function of each relay in accordance with a matrix (tripping matrix) structure. — Binary inputs Three...

— 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...

PROTECTIVE FUNCTIONS Note - When enabled it is started by the internal threshold of the undercurrent protection (37). The discharge time counter may be manually cleared Compensation current (/NC MOD calib) - Inn Compensation angle (/NC PHI calib) -° Note - The compensation parameters are determined by the device as a result of the command "INC Comp exe" that must be activated in the Definite time • 37 First threshold definite time (/<def) 0.1 /n • /<def Operating time (f<def) 0.100 s Note -The 37 element is based on RMS measurement of three phase currents (the computed RMS value takes into account...

METERING & RECORDING • Fundamental RMS phase currents /n, /I_2, 113 • Fundamental RMS calculated residual current /EC • Fundamental RMS of neutral current /N • Displacement angle of neutral current /N PHI • Fundamental RMS of compensated neutral current /NC • Displacement angle of calibrated neutral current /N PHI calib • Fundamental RMS of calibrated neutral current /NC MOD calib • Capacitor calculated peakvoltages (p.u.) I/1, V2, I/3 Circuit Breaker Digital inputs • Start IN>AL element • Trip IN>AL element Open - Close - Unknown Event recorder Recording mode circular • Output relays switching...

www.thytronic.it A PERSONALISED SERVICE OF THE PRODUCTION, A RAPID DELIVERY, A COMPETITIVE PRICE AND AN ATTENTIVE EVALUATION OF OUR CUSTOMERS NEEDS, HAVE ALL CONTRIBUTED IN MAKING US ONE OF THE BEST AND MOST RELIABLE PRODUCERS OF PROTECTIVE RELAYS. FORTY YEARS OF EXPERIENCE HAS MADE STANDARD THESE ADVANTAGES THAT ARE GREATLY APPRECIATED BY LARGE COMPANIES THAT DEAL ON THE INTERNATIONAL MARKET. A HIGHLY QUALIFIED AND MOTIVATED STAFF PERMITS US TO OFFER AN AVANT-GARDE PRODUCT AND SERVICE WHICH MEET ALL SAFETY AND CONTINUITY DEMANDS, VITAL IN THE GENERATION OF ELECTRIC POWER. OUR COMPANY PHILOSOPHY...