Earth Fault Compensation Controller EFC50(i)
12Pages

Earth-Fault Compensation Controller EFC50 / EFC50i TRENCH

Application Control Algorithm In high impdance 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 extinguished without the need to switch off the faulty part of the network. As the Arc Suppression Coil (ASC) and the earth...

Conception - EFC50 / EFC50i Hardware microprocessor based controller 19''-rack mounted (3 HU), width 42 TE Օ optimized operation by means of a graphic LCD display, keypad and scroll wheel extended operation via PC by means of a terminal program Օ indication of the digital out-puts via customer labeled and parameterized LED's at the front central acquisition and display of arc suppression coil alarms via LEDs at the front Օ serial interfaces and Ethernetport analogue output modules 0 ... 20 mA outputs for external indication of coil position and neutral-to-ground voltage Օ EFC50:...

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

TRENCH Software easy parameter setting, since pre-set factory values can be adjusted by the user as required Օ high flexibility 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 Օ indication of operating status via text messages counting of various events (e.g. transient earth fault) and controller conditions for statistical evaluations Օ remote parameter changes by means of a PC connected via...

Technical Data - EFC50 / EFC50i 6 EFC50 EFC50i hardware operating 20 line display, 26 characters per line scroll wheel, keypad x x serial interface for SCADA, PC or modem 2 pieces RS-232, 9 pin, 1x front and 1x rear 1 piece RS-485 (alternative optical port) x x x (x)* x x x (x)* Ethernet port 1 piece RJ-45 x x analogue voltage inputs 3 mV ... 110 V AC 50 Hz rated burden < 0,5 VA 2 (+1)* 3 analogue current inputs 0 ... 1 A AC 50 Hz (3)* 3 analogue outputs for Vo, coil position 0 ... 20 mA DC, software programmable 1 (+2)* 3 coil position linear potentiometer 0 ... 200 ohms resp 0 . or 0 ......

TRENCH EFC50 EFC50i Option (EFC50 / EFC50i) software automatic earth fault compensation control of stepless adjustable plunger core coils x automatic earth fault compensation control of stepless adjustable plunger core coils by means of the current injection into the zero-sequence system x terminal program EFCTerm for Windows x x automatic, adaptive menu x x measurement memory x x 3 menu access levels for users x x software-update via serial interface or Ethernet port x x several controllers within the same network system x predefined coil position x automatic resistor control x fixed coil...

ECI Current Injection Device The Current Injection Device ECI is used to produce differen-tial measurement values by means of the current injection into the zero-phase sequence system. 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 symmetri-cal and the neutral-to-ground voltage extremely low, and no reliable control signal is readily available, it is possible to increase the neutral-to-ground voltage by using the permaͭnent current injection in a way that...

Erdschluss Kompensationsregler EFC50 Earthfault Compensation Controller EFC50 SI il 0} A l i r. I t ^ fa If l sn f If aa #-s D O 8 8 ai § Sfj i° i 3 H S a» - a Il l |i ^| Il il 11 il- 9S fi il a ta II il II II il II o o a a S" c r篹 a f S a § 8 X 1 \} <j m u u i I < I Si il S j 8 s § 11 33 a a E B II if il II S S lf if 2 =■ E& Endschallor Final pOSilrgri swilctl. Arc suppression coil / TA-Standard al as il Erdschluss Lschspule / TA-Standard

10 fig. 8 EFC 50i wiring diagram - control with current injection

TRENCH fig. 9 EFC 50/50i wiring diagram - with option board 11

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