1. Line differential relay 7SD52
Line differential relay for HV and
UHV lines/cables with a serial
communication interface
7SD52
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2. 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"

3. 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

4. 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

5. 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

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

7. 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

8. 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

9. 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)

10. 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)

11. 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

12. Topologies: Chain topology for max. 6 line ends1 2 3
PI1
PI1
PI2
PI1
PI2
PI - Protection Interface
PI1 6 5 4
PI1
PI2
PI1
PI2

13. Topologies: Ring topology, 6 line ends1 2 3
PI2
PI1
PI2
PI1
PI1
PI2
PI2
PI1 6 5 4
PI1
PI2
PI1
PI2
PI - Protection Interface

14. 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

15. Browser based commissioning aid

16. Comprehensive fault analysis with DIGRA 4

17. Prefault and fault conditions in the vector diagram