Line differential relay 7SD52 Line differential relay for HV and UHV lines/cables with a serial communication interface 7SD52 Alle folgenden Notizen ersetzen nicht das MS-PowerPoint-Benutzerhandbuch, sondern sind Notizen zu den vorliegenden Folien. Falls Sie generell andere/keine Aufzählungszeichen wollen, können Sie über "Ansicht" in Ihrer "Folienvorlage" einzeln in jeder Textzeile über "Text" "Aufzählungszeichen..." andere Aufzählungszeichen auswählen/ das "verwenden" ausschalten. Dabei können Sie über "Text" "Zeilenlineal" mit der Maus auch die Einrückmarken zurückstellen. Im vorliegenden Hauptteil dieser Folie wurde in den ersten, leeren Zeilen über "Text" "Aufzählungszeichen..." das "verwenden" ausgeschaltet. Hinweis zum Drucken von Folien auf QMS PS 815 und Kyocera P-2002: Im Fenster "Drucken" wählen "Drucken: Folien" abwählen: "An Seitengröße anpassen" wählen: "Druckereinrichtung..." wählen: "Einrichtung..." wählen: "Querformat" + "Optionen..." wählen: "Ränder: Keine" + "Skalierung (%): 94" + (4x) "ok"

Protection and communication join together Three benefits of the 7SD52 Differential protection for the universal use with easy to handle settings Two up to six line ends , for serial and parallel compensated lines, handles transformers and compensation coils within the protection zone, tripping time approx. 15 ms with fast high set element Additional functions for very long overhead lines and cables Considation of local CT errors, charge current compensation (step 2), increased setpoint during switching-on conditions Direct and modular connection to fibre optic and digital communication networks Alle folgenden Notizen ersetzen nicht das MS-PowerPoint-Benutzerhandbuch, sondern sind Notizen zu den vorliegenden Folien. Falls Sie generell andere/keine Aufzählungszeichen wollen, können Sie über "Ansicht" in Ihrer "Folienvorlage" einzeln in jeder Textzeile über "Text" "Aufzählungszeichen..." andere Aufzählungszeichen auswählen/ das "verwenden" ausschalten. Dabei können Sie über "Text" "Zeilenlineal" mit der Maus auch die Einrückmarken zurückstellen. Im vorliegenden Hauptteil dieser Folie wurde in den ersten, leeren Zeilen über "Text" "Aufzählungszeichen..." das "verwenden" ausgeschaltet. Hinweis zum Drucken von Folien auf QMS PS 815 und Kyocera P-2002: Im Fenster "Drucken" wählen "Drucken: Folien" abwählen: "An Seitengröße anpassen" wählen: "Druckereinrichtung..." wählen: "Einrichtung..." wählen: "Querformat" + "Optionen..." wählen: "Ränder: Keine" + "Skalierung (%): 94" + (4x) "ok"

Application for a three terminal configuration Monomode fibre optic cable up to 35 km with 1300 nm interface Monomode fibre optic cable up to 10 km (1300 nm modul) Distance relay 7SA52 X21 G703.1 PCM multi- plexer PCM multi- plexer SDH comms-network o e e o 820 nm max. 3 km Option: I-REGB o e Comms- converter G703.1: 64 kBit X21: N*64 kBit (1N8) time synchronisation

Scope of functions / Hardware options Options for the Protection Interface Scope of functions - Fast high set element with charge comparision - Sensitive normal trip stage with vector summation principle - Autoreclosure 1/3 pole - Communication features - Commissioning aid - Overload protection - Backup-/emergency overcurrent - Multiterminal extention - Switch on to fault protection - 4 remote commands 24 remote signals Relay Hardware O 820 nm 1,5 / 3 km multimode ST- connector 3Iph, and IE 4 U 8 binary inputs 16 contacts 1 - 2 protection interfaces System interface PC-interface Time synchronisation internal O 1300 nm 10 km monomode ST- connector ½*19´´ internal 16 binary inputs 24 contacts 24 binary inputs 32 contacts Option: 5 fast trip contacts O 1300 nm 35 km monomode FC- connector internal Electrical X21 G703.1 interface O E 820 nm 1,5 km ST- connectors 1*19´´ External converter

Hardware option of the comms interfaces Protection interface 2 Port E Synchronous N x 64kB/sec 7SD52 Remote line end 2 Plug in modules Interfacemodul 1 RS485 or FO or RS232 service-interface DIGSI 4; also for modem connection and Browser Remote line end 1 Protection interface 1 Port D Synchronous N x 64kB/sec Subst. control interface communication modules Substation control FO (Fibre optic) or RS485 or RS232 Available Protocols IEC - standard Interfacemodul 2 RS485 or FO local-PC interface DIGSI local Browser Serial time sync. input GPS-receiver

Main board of the relay with it´s Communication - Interfaces Main processor board of the relay Sockets for the communication modules

Main protection function Features of the differential function Phase selective multiend differential protection (2 - 6 ends). Tripping time 15 ms with fast charge comparison protection. Fundamental vector comparison for the sensitive trip stage. Dynamic increase of differential setpoint during switch-on of long lines / cables (settable time) CT saturation detector (only 5 ms saturation free time due to external faults necessary) Phase selective intertrip within 15 ms Settable delay time for single phase faults (feature for inductive compensated networks) Option: Inrush 2nd harmonic restraint with vector group adaption. Undelayed trip for high fault currents Optional Lockout function

Adaptive differential relaying Consideration of CT- errors and comms-errors IDiff IN I1 I2 Tripping area I2 I3 I3 Restraint area I1 IDiff> I1 I IN Phasor summation: Error summation: IDiff = I1 + I2 + I3 I = IDiff> + Linear CT-error ( + Syncronization error IK) Trip, if diff.current exceeds the max. permissible error

To complete the 7SD52 Additional functions 3 stage backup- or emergency O/C protection (Can be activated automatically if the communication with the remote end is >50 ms interrupted) Overload function (Thermal replica with IOperation) User definable logic and control functions (AND, OR, NOT, Timer, Flip-Flop) 4 remote commands via binary input or logic inputs (destination is adressable), 24 remote signals Operational values: currents, voltages, power, delay time, differential current - remote end refresh 2 s Fault recorder with voltages, currents, binary traces and differential and restraint current per phase Fast monitoring functions (Fast broken wire supervision, Current symmetry) Switch On to Fault protection Option: Three pole and single pole AR (Single pole AR during 2pole fault without earth possible, adaptive AR)

Familiar with digital communication networks Features of the relay to relay communication Synchronous data transmission by HDLC- protocol Permanent supervision of the data transmission Measurement and compensation of signal transmission time (max. 20 ms) Counts number of invalid telegrams Blocking the diff.protection if transmission failure rate is too high Settings for the data transmission (N*64 kBit/s, N settable from 1 - 8, synchronous HDLC-protocol) Communication device addresses (Protection devices are clearly assigned to a defined protection section) Detection of reflected data in the loops in comms- network Step 2: Microsecond exact time synchronisation via satellite (civil - IRIG-B) (If signal transmission time depends on the transmission direction, Online high resolution fault recorder)

Ring and Chain topologie Automatic change from closed ring to chain, if one connection is lost or not available I3 I2 I1 side 1 side 2 side 3 side 2 side 3 I2 Connection to other diff. relays I3 I3+I1 I2 I1+I2 I3 I1 I3+I1 I1+I2 side 1 Closed ring Partial current summation

Topologies: Chain topology for max. 6 line ends 1 2 3 PI1 PI1 PI2 PI1 PI2 PI - Protection Interface PI1 6 5 4 PI1 PI2 PI1 PI2

Topologies: Ring topology, 6 line ends 1 2 3 PI2 PI1 PI2 PI1 PI1 PI2 PI2 PI1 6 5 4 PI1 PI2 PI1 PI2 PI - Protection Interface

Plug and Protect Commissiong helps and test features Signal transmission time Mean value of transmit and receive direction Generation of signals for switching test loops Sending of defined telegram patterns looped back to the receive input of the transmitting relay Absolute value and phase measurement of currents Local measurement of angle between IL1, IL2, IL3 ,Angle between currents of each phase from remote CB test trip Counting of faulty telegrams in % per minute and hour Activation of binary inputs and outputs by operating software DIGSI 4. Display of the status of binary inputs Test telegrams to the substation control system Automatic Switchover from 3 line to 2 line end configuration (while commissioning 3rd line end) Complete commissioning support with DIGSI 4 and browser based PC-software IL1_2 Phi1->2 IL1_1 IL2_1 IL2_2 IL3_2 IL3_1

Browser based commissioning aid

Comprehensive fault analysis with DIGRA 4

Prefault and fault conditions in the vector diagram