SIPROTEC 4 7SA522 Distance Protection for Transmission Lines Productmanager Distance Protection Michael Claus EV S V 13 Nürnberg H Phone: +49 911 433 8261 Fax: +49 911 433 8301 Email: Michael.Claus@nbg6.siemens.de 1 1

What does SIPROTEC 4 mean? SIPROTEC 4 is a new family of digital protection- and control-devices All SIPROTEC 4 relays include control-functions and user-definable logic (PLC) SIPROTEC 4 assists you with: a simplified handling together with DIGSI 4 a better adaptation to local requirements SIPROTEC 4 uses modern communication-technology for system integration SIPROTEC 4 uses a common hardware platform

7SA522 Distance Protection for Transmission Lines

SIPROTEC 7SA522 Front design Navigation Keys convenient menu operation 4-line back-lit display Measured values Fault data 4 freely assignable function keys with slot for legend text Turning ON/OFF of functions Control of switchgear (plant) 14 LED´s for user assignment and slot to insert legend text 9-pole service interface standard cable DIGSI 4 Proven numeric keypad secure entry of numbers easy password entry Width of housing 1/2 of 19" or 1full 19“ rack

SIPROTEC 7SA522 Terminals and Communication Interfaces Open to new techniques (methods) electric or fibre optic (FO) process or 2nd remote relay interface Width of housing 1/2 of 19" or full 19" Binary inputs 8 (16*, 24*) Output contacts 16 (24*,32*) (*in full 19“ rack housing) Remote relay interface (plan) electric or fibre optic (FO) for protection signalling System interface electric or fibre optic IEC60870-5-103 or Profibus FMS (approx. 12/00) in future DNP3.0, MODBUS and Profibus DP 4 Voltage Transformers (VT) 4 Current Transformers (CT) option with Ienormal or Iesensitive Service interface electrical or fibre optic (FO) DIGSI 4 via Modem Time synchronization GPS with IRIG-B and DCF-77

7SA522 Connection Diagram: Basic Version Optional Sensitivity: normal high (5mA) Connection: Ven Vsync Vx

7SA522 Single Line Diagram !

SIPROTEC 7SA522 Scope of functions (1) ANSI-No. Distance Protection quadrilateral and/or MHO characteristic full scheme measurement with sophisticated loop selection three phase and single phase tripping five independent zones and one controlled overreach zone all zones can be set forward/reverse/non-directional with/without parallel line compensation special filtering for CVT transients special algorithm for detection and compensation of CT saturation Fault Locator with/without parallel line compensation Universal teleprotection interface (PUTT, POTT, Blocking, Unblocking, DTT...) 21, 21N FL 85-21 17.10.97 en513all7

SIPROTEC 7SA522 Scope of functions (2) ANSI-No. High resistance earth fault protection for earthed systems directional and/or non-directional 4 stages definite-time and/or inverse-time characteristic high sensitivity (3 mA secondary) backup protection running in parallel to the distance protection Teleprotection interface for earth fault protection (Directional comparison, Blocking, Unblocking) Weak infeed protection (Echo and Trip) Power swing blocking/out-of-step tripping 50N, 51N, 67N 85-67N WI 68 17.10.97 en513all8

SIPROTEC 7SA522 Scope of functions (3) ANSI-No. 50, 51 50N-2, 51N-2 59 50HS 50-STUB 79 25 50BF Overcurrent protection DMTL/IDMTL as parallel or emergency function Overvoltage protection Fast tripping with switch-onto-fault condition STUB Bus Overcurrent protection Single and three pole multishot automatic reclosure Synchro-check Circuit-breaker failure protection

SIPROTEC 7SA522 Scope of functions (4) ANSI-No. 74TC 86 FR 47 Trip Circuit Supervision Lock Out Oscillographic Fault Recording Voltage Phase Sequence Interfaces Time synchronization (IRIG-B, DCF77) User interface#1 (on the front for DIGSI 4) User-(Service-)interface #2 (on the rear, DIGSI 4/Modem) System interface (IEC60870-5-103/Profibus FMS*/others) Remote relay interfaces #1 (planned for teleprotection) Remote relay interfaces #2 (planned for teleprotection) * available in Version 4.2 approx. 1. Q/01

SIPROTEC 7SA522 Quadrilateral Zone Characteristic

SIPROTEC 7SA522 MHO Zone Characteristic

MHO characteristic Effect of polarization Example: 2 phase fault B-C Symbols: ZR zone setting V BC measured fault voltage I B, I C measured fault currents k pol polarization factor (0.15%)

7SA522 - Trip time curves at SIR = 1

7SA522 - Parallel-line compensation: connection and setting

7SA522 - Fault locator

7SA522 - Teleprotection Schemes Configuration

7SA522 - Phase segregated Teleprotection Z1 Z1B L1-E 1 1 A B Z1 Z1B A1 trips single-phase in L1 with a phase-segregated L1-receive-signal Maximum of Selectivity Note: 3 binary channels for both directions are requested or (in preparation) one serial link

7SA522 - Teleprotection with three-terminal lines Software provides teleprotection of three-terminal lines without additional logic

7SA522 - Echo and Tripping in case of no-infeed or weak-infeed Configuration Settings Matrix The receive signal is derived from : and *Three-terminal schemes are supported as well Phase segregated weak-infeed tripping ! Note: The echo signal must be marshalled in addition to the send signal on the transmission signal contact 17.10.97 en513ase2

7SA522 High Resistance Earth Fault Protection (1) Earth (zero sequence) current protection, 4 stages 3 definite-time stages 1 inverse-time stage: IEC, logarithmic inverse or ANSI characteristic this stage can also be used as a 4th definite-time stage Directional determination with 3V0 and/or Ipol of an earthed power transformer Directional determination with V2 and I2 (negative sequence) Sensitive 3I0-measurement with a dynamic from 0.005 A to 100 x In Elimination of higher harmonics with special digital filters Inrush-stabilisation with I0/100Hz Teleprotection: Directional comparison, Blocking or Unblocking Operation with weak infeed trip and echo Instantaneous trip after switch-onto-fault

7SA522 High Resistance Earth Fault Protection (2) Definite-time characteristic

7SA522 High Resistance Earth Fault Protection (3) Inverse-time characteristic: IEC

7SA522 High Resistance Earth Fault Protection (4)

7SA522 High Resistance Earth Fault Protection (5)

7SA522 High Resistance Earth Fault Protection (6) Tripping characteristic Logarithmic Inverse t T3I0pmax (P3145) T3I0p (P3144) 3I0p(P3140) Example: t = 5.8 - 1.35 ln(3I0 / 3I0p) T3I0min (P3141) 3I0p Startpoint(P3154) 3I0 / 3I0p

7SA522 High Resistance Earth Fault Protection (6) Filter characteristic for stages 3I0>>> and 3I0>>

7SA522 High Resistance Earth Fault Protection (7) Filter characteristic for stages 3I0> and Inverse time stage

7SA522 - STUB protection for 11/2-circuit breaker arrangement Release of STUB-stage with open line isolator:

7SA522 - Monitoring new Plausibility monitoring Operating system monitoring Auxiliary voltage failure Measured value detection Buffer battery Hardware–Watchdog Software–Watchdog Working memory Program memory Parameter memory Sampling frequency 1/5 A–setting Calibration data Earth current transformer sensitive/normal Modules (I/O Boards) Plausibility monitoring Current sum Current symmetry Open conductor Fuse Failure 1- / 2-pole failures 3-pole failures Voltage sum Voltage symmetry Voltage phase rotation ! new