Earth-Fault Compensation Controller EFC50 / EFC50i THE PROVEN POWER.

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1 Earth-Fault Compensation Controller EFC50 / EFC50i

2 Application In high impedance grounded power distribution networks the neutral point of the network is connected to earth by means of a stepless adjustable inductor. If the resonance circuit formed by the adjustable inductive coil and the earth capacitance of the network is tuned to or close to resonance, the fault current is greatly reduced in case of a line-to-earth fault (earth fault). In most cases the arc caused by the fault current is etinguished without the need to switch off the faulty part of the network. As the Arc Suppression Coil (ASC) and the earth capacitance form a resonance circuit, the neutral-to-ground voltage of the network depends on the value of the inductance of the ASC and reaches a maimum when the ASC is tuned to resonance. This dependence of the neutral-to-ground voltage is utilised by the EFC50 and EFC50i Earth-Fault Compensation Controller for automatic tuning of on load adjustable ASCs. Control Algorithm Minimal Coil Movement- EFC50 During a tuning operation the ASC is adjusted by a small amount. Measuring the coil-position as well as the neutral-to-ground voltage during the adjustment operation, the controller computes the detuning value v, the asymmetry value k and the damping value d, which determine the resonance curve of the neutralto-ground voltage. Taking into consideration a customer settable under- or overcompensation, the controller calculates the necessary position and directly adjusts the ASC to the calcu lated value. Determining the Resonance Peak by Going Beyond It - EFC50 This method may be used if the asymmetry of the network is small, which results in very low neural-toground voltages. In this case, network reactions may cause fluctuations of the neutral-to-ground voltage. Therefore it is not possible to compute reliably the parameters of the network by means of a small detuning of the ASC. So the controller adjusts the ASC over a wider range, which must include the resonance peak. It stores the measured values and calculates out of these the resonance curve. Taking into consideration the desired under- or overcompensation, it computes the necessary position and adjusts the ASC to that value. Determination of the Resonance Point by Current Injection - EFC50i The EFC50i calculates the resonance curve by injecting a current into the zero sequence system of the network and measuring the vectors of both the neutral-to-ground voltage and the injected current. Where a network is essentially symmetrical and the neutral-to-ground voltage etremly low, and no reliable control signal is readily available, it is possible to increase the neutral-to-ground voltage by using the permanent current injection in a way that changes of the network configuration provide a reliable signal for the controller (inverse operation mode). In case of an outage of the current injection, the EFC50i automatically changes to a redundancy control mode whereby the resonance curve is determined via a slight adjustment of the ASC. 2

3 Conception - EFC50 / EFC50i Hardware microprocessor based controller 19 -rack mounted (3 HU), width 42 TE optimized operation by means of a graphic LCD display, keypad and scroll wheel etended operation via PC by means of a terminal program Hardware Options housing for wallmounting alternative power supply optical serial port IEC modul indication of the digital outputs via customer labeled and parameterized LED s at the front central acquisition and display of arc suppression coil alarms via LEDs at the front serial interfaces and Ethernetport analogue output modules ma outputs for eternal indication of coil position and neutral-tog round voltage EFC50: prepared for easy upgrade to the Earth-Fault Compensation Controller EFC50i (see page 2) Fig. 1 Earth-Fault Compensation Controller EFC50i with 19 -rack mounted Current Injection Device ECI 3

4 Operating easy operation by means of an integrated 20 line display and the scroll wheel clear menu guide with help - tet automatic, adaptive menu according to activated software options easy adaptation to individual conditions via network adjustable parameters Windows terminal program EFCTerm for parameter setting and on-site operation via PC as well as for remote control by means of modem Fig. 2 operating panel Fig. 3 EFCTerm 4

5 Software easy parameter setting, since pre-set factory values can be adjusted by the user as required high fleibility through software controlled inputs and outputs, free assignment of digital outputs to different state functions as well as free assignment of digital inputs to different control functions powerful PLC - the functions of a modern PLC are available indication of operating status via tet messages counting of various events (e.g. transient earth fault) and controller conditions for statistical evaluations remote parameter changes by means of a PC connected via modem to the serial interface several parameter levels for adaptive user settings Software Options several controllers within the same network (reliable control without mutual influences), no remote connection necessary adjusting the ASC to a predefined value when the ASC is switched off automatic resistor control control of an additional fied coil (automatic switching on/off of the fied coil) control back to ideal compensation (v=0) if an earth fault occurs SCADA SPABus IEC /103/104 IEC (with optional hardware modul) automatic switching of a damping resistor during search operation if U eceeds Uma software-update via serial interface or Ethernet port 5

6 Technical Data EFC50 / EFC50i EFC50 EFC50i Hardware operating 20 line display, 26 characters per line scroll wheel, keypad serial interface for SCADA, PC or modem 2 pieces RS-232, 9 pin, 1 front and 1 rear 1 piece RS-485 (alternative optical port) ()* ()* Ethernet port 1 piece RJ-45 analogue voltage inputs 3 mv V AC 50 Hz 3 3 rated burden < 0,5 VA analogue current inputs A AC 50 Hz 3 3 analogue outputs for Vo, coil position ma DC, software programmable 3 3 coil position linear potentiometer ohms resp kohm 1 1 or ma DC input signal digital inputs potential free contacts V AC/DC, digital outputs potential free change over contacts, 230 V AC/DC, ma 5 A continuous ma switching capacity AC VA 2 2 ma switching capacity AC15 (230 V AC) VA ma switching capacity DC1 (30/110 V DC) - 5 A / 0,2 A digital outputs potential free make contacts, 230 V AC/DC, ma 5 A continuous ma switching capacity AC VA ma switching capacity AC15 (230 V AC) VA ma switching capacity DC1 (30/110 V DC) - 5 A / 0,2 A auiliary voltage V AC/DC (other voltages on request) *( ) Option 6

7 EFC50 EFC50i Option (EFC50 / EFC50i) Software automatic earth fault compensation control of stepless adjustable plunger core coils automatic earth fault compensation control of stepless adjustable plunger core coils by means of the current injection into the zero-sequence system terminal program EFCTerm for Windows automatic, adaptive menu measurement memory 3 menu access levels for users software-update via serial interface or Ethernet port several controllers within the same network system predefined coil position automatic resistor control fied coil control control back to ideal compensation (v=0) at earth fault condition SCADA automatic switching if U eceeds Uma Mechanical Data dimensions EFC50/50i module 19 Rack width mm (42 TE) width mm height mm (3 HE) height mm depth mm depth mm weight appro 3 kg appro 2 kg temperature operating 0 C C storage -25 C C transport -25 C C ma installation altitude 2000 m. a. m. s. l. humidity (24h average) from 5% to 95% acc. to IEC protection class IP20 7

8 ECI Current Injection Device The Current Injection Device ECI is used to produce differential measurement values by means of the current injection into the zero-phase sequence sytem. This approach is used by both the Earth-Fault Compensation Controller EFC50i (see page 2) and the Earth-Fault Detection Device EFD (see brochure E667). Where a network is essentially symmetrical and the neutral-to-ground voltage etremely low, and no reliable control signal is readily available, it is possible to increase the neutral-to-ground voltage by using the permanent current injection in a way that changes of the network configuration ensuring a reliable signal for the controller (inverse operating mode implemented in the EFC50i control algorithm). The current injection into the zero-phase sequence system is usually done via a power auiliary winding of the Arc Suppression Coil. The Current Injection Device ECI essentially consists of a transformer, capacitors for current limiting, relays, control- and signal contacts. The following designs are available: indoor design, outdoor design, mounting plate for installation in an eisting cubicle, 19 -rack mounting. Fig. 4 Increase of the zero-sequence voltage by means of continuous current injection Fig. 5 ECI in conventional design (indoor design, outdoor design and design on mounting plate available) Fig. 6 ECI 19 -rack mounted 8

9 F (Referenzspannung) (Mit ECI oder vektorieller Auslösung) (Reference voltage) (With ECI or vectorial trigger) Verlagerungsspannung Neutral to earth voltage X10/1 X10/2 X10/3 X10/4 U1 V1 U2 V V AC V01 X6/3 X6/4 Verlagerungsspannung Neutral to earth voltage F Potentiometer Potentiometer X7/1 X7/3 X7/2 +Pot. spot, ma -Pot. X5/2 X5/1 X5/3 ma Strom ma current min Strom min current Stellungspot. Position pot. E 0-20 ma Ipos AO ma Ipos Endschalter min. Strom Final pos. switch min. current Endschalter ma. Strom Final pos. switch ma. current X8/2 - X8/1 + X9/3 X9/1 ECOM.1 E1.1 X9/2 E2.1 X1/2 X1/6 X1/22 X1/24 X1/7 X1/19 X1/21 -SV min Strom min current ma Strom ma current Endschalter Final position switch E X4/3 KCOM.1 X1/15 Motor: Strom kleiner Motor: current decreasing Motor: Strom größer Motor: current increasing X4/2 K2.1 X4/1 K1.1 X1/18 X1/17 -SV Strom kleiner Current decreasing Strom größer Current increasing Motorschütze Motor contactors D (Widerstand ein) (Resistor on) X4/12 KCOM.3 X4/9 K6.3NO -SV X7/1 (Widerstandssteuerung) (Widerstand Ein) (Resistor control) (Resistor on) D Reserve Spare X4/10 X 4/11 K7.3NO K7.3NC Erdschluss Earthfault Automatik ein Automatic on X4/8 X4/7 X4/6 KCOM.2 K5.2 K4.2 C Keine Störung No malfunct. Störung Malfunction X4/4 X4/5 K3.2NO K3.2NC (...) Option Option analoger Eingang Analog input C Automatik aus Automatic off Automatik ein Automatic on Automatik blockiert Automatic blocked Widerstand Auslösung Resistor forced trigger X9/8 X9/7 X9/6 X9/5 X9/4 ECOM.2 E6.2 E5.2 E4.2 E3.2 - UH - SV AO +/ +/-SV analoger Ausgang Analog output digitaler Eingang Digital input digitaler Ausgang Digital output Hilfsspannung Signal voltage B Versorgungsspannung Power suppy V AC/DC (20-70V DC) X 11/1 X 11/2 X 11/3 PE L(+) N(-) B A CAD erstellte Zeichnung. Keine manuellen Änderungen durchführen. Toleranzen nach Oberfläche ISO 2768-ÖNORM M1365 Die Weitergabe oder Vervielfältigung dieser Unterlage sowie die Verwertung und Mitteilung ihres Inhaltes ist Teil1 Teil2 EFC50/50i wiring diagram - standard ohne ausdrückliche Genehmigung nicht gestattet. f m c v H K L Zuwiderhandlungen verpflichten zu Schadenersatz. Abm.: mm ; % Alle Rechte vorbehalt en. TRENCH AUSTRIA GMBH % ; >2000 1% Datum Name Bearb MPK-Sch Gepr TE-Si Fig. 7 B AO 1 geändert Krw 01 div. Anpassungen Sch Maßstab: Kunde: A.Nr.: Material: F.Nr.: Erdschluss Kompensationsregler EFC50 Earthfault Compensation Controller EFC50 ENOAG01 Änd. Zust. Blatt B 1 3 Bl. A 9

10 ErdschlussLöschspule / TA- Standard ArcSuppressionCoil / TA- Standard F (Verlagerungsspannung 2) (Neutral to earth voltage) (nur für Kupplungserkennung) (Only for coupling detection) X14/1 U3 X14/2 V V AC V02 X6 /3 X6 /4 AndereSpule Other coil F Messung Einspeisestrom Measurement injected current X14/3 X14/4 k1 l1 1A Ieci1 l k X1/24 X1/25 Reserve Stromeingang Spare current input Reserve Stromeingang Spare current input X14/5 X14/6 X14/7 X14/8 k2 l2 k3 l3 1A 1A ECI-Stromeinspeisegerät ECI-Current Injection Device E (Nur für Master / Slave) (Only for master / slave) Regler ist Master Controller is Master ECI -1 negative Einspeisung ECI-1 negative injection ECI-1 positive Einspeisung ECI-1 positive injection ECI Verwendung ECI used ECI Anforderung ECI request X12/ 12 X12/ 11 X12/ 10 X12/9 X12/8 X12/7 KCOM4 K12.4NO Slave - Eing. anderer EFC50 Slave - input other EFC50 K11.4NO K10.4NO -S V K9.4NO Verwendung - Eing. anderer EFC50 Used - input other EFC50 K8.4NO Anforderung - Eing. anderer EFC50 Request - input other EFC50 X1/16 X1/17 X1 /8 X1 /9 E D D Regler ist Slave Controller is Slave ECI -1 negative Einspeisung ECI-1 negative injection ECI-1 positive Einspeisung ECI-1 positive injection X 12/6 X 12/5 X 12/4 X 12/3 ECOM.3 E 11.3 E10.3 E9.3 -SV Master - Ausg. anderer EFC50 Master - output other EFC50 X1/20 X1/21 X1/12 X1/13 ECI Verwendung ECI used X12/2 E8.3 Verwendung - Ausg. anderer EFC50 Used - output other EFC50 C ECI Anforderung ECI request X 12/1 E7.3 Anforderung - Ausg. anderer EFC50 Request - output other EFC50 C (0-20 ma Verlagerungsspannung 2) AO3 (0-20 ma neutral to earth voltage 2) 0-20 ma Verlagerungsspannung 1 AO ma neutral to earth voltage 1 X13/4 X13/3 X13/2 X13/ (...) nur für 2SS-Betrieb only for 2BB-operation analoger Eingang Analog input AO analoger Ausgang Analog output digitaler Eingang Digital input digitaler Ausgang Digital output B +/-U H +/-SV Hilfsspannung Signal voltage A Fig. 8 EFC 50i wiring diagram - control with current injection CAD erstellte Zeichnung. Keine manuellen Änderungen durchführen Toleranzen nach ISO 2768-ÖNORM M1365 Die Weitergabe oder Vervielfältigung dieser Unterlage sowie die Verwertung und Mitteilung ihres Inhaltes ist Teil1 Teil2 ohne ausdrückliche Genehmigung nicht gestattet. f m c v H K L Zuwiderhandlungen verpflichten zu Schadenersatz. Abm.: mm ; % Alle Rechte vorbehalten. TRENCH AUSTRIA GMBH % ; >2000 1% Dat um Bearb Gepr Oberfläche Name MPK-Sch TE-Si Maßstab: Kunde: A.Nr.: Material: F.Nr.: EFC50 mit ECI Ein/Ausgänge EFC50 with ECI in/outputs A 10

11 F (eterner Leistungsschalter) (Eternal power switch) X5/12 X 5/11 ECOM.5 E21.5 -SV F (Kommando Widerstand blockieren) (Command resistor blocked) X5/10 E20.5 Reserve Spare X5/9 E19.5 Kommando Strom tiefer Command current down X5/8 E18.5 Kommando Strom höher Command current up X5/7 E17.5 E X5/6 ECOM.4 -SV E Meldung Fispule ein Message ficoil on X5/5 E16.4 Temperatur trip Temperature trip X5/4 E15.4 Temperatur Warnung Temperature warning X5/3 E14.4 Buchholz Trip Buchholz trip X5/2 E13.4 D Buchholz Warnung Buchholz warning Netzunsymmetrie > Zf Net-asymmetry > Zf X5/1 E12.4 X6/12 KCOM.7 X6/11 K21.7NO D Abgestimmt, nicht kompensiert Tuned, not compensated X6/10 K20.7NO Abgestimmt, kompensiert Tuned, compensated X6/9 K19.7NO C Temperatur trip Temperature trip Temperatur Warnung Temperature warning Buchholz Trip Buchholz trip Buchholz Warnung Buchholz warning X6/8 KCOM.6 X6/7 K18.6NO X6/6 K17.6NO X6/5 K16.6NO X6/4 K15.6NO (...) Software option Software option analoger Eingang Analog input AO analoger Ausgang Analog output C (Kommando Fispule ein) (Command ficoil on) (Kommando Fispule aus) (Command ficoil off) X6/3 KCOM.5 X6/2 K14.5NO X6/1 K13.5NO digitaler Eingang Digital input digitaler Ausgang Digital output +/ Hilfsspannung +/-SV Signal voltage B Digitale Ein- und Ausgänge können vom Kunden frei definiert werden. (Menü: SPS programmieren) Digital in- and outputs may be freely defined by the client. (menu: PLC programming) Fig. 9 EFC 50/50i wiring diagram - / CAD erstellte Zeichnung. Keine manuellen Änderungen durchführen Toleranzen nach Oberfläche Die Weitergabe oder Vervielfältigung dieser Unterlage ISO 2768-ÖNORM M1365 sowie die Verwertung und Mitteilung ihres Inhaltes ist Teil1 Teil2 ohne ausdrückliche Genehmigung nicht gestattet. f m c v H K L Zuwiderhandlungen verpflichten zu Schadenersatz. Abm.: mm ; % Alle Rechte vorbehalten. TRENCH AUSTRIA GMBH % ; >2000 1% Datum Name Bearb. MPK-Sch Gepr. Maßstab: Kunde: A.Nr.: Material: F.Nr.: EFC50: zusätzliche digitale Ein/Ausgänge TE-Si EFC50: additional digital in/outputs 11 A Blatt A

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