1. SIPROTEC 4 7SA522 Distance Protection for Transmission Lines
Productmanager Distance Protection
Michael Claus
EV S V 13 Nürnberg H
Phone:
Fax: 1 1

2. 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

3. 7SA522 Distance Protection for Transmission Lines

4. 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

5. 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
IEC 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

6. 7SA522 Connection Diagram: Basic Version
Optional
Sensitivity:
normal
high (5mA)
Connection:
Ven
Vsync Vx

7. 7SA522 Single Line Diagram !

8. 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
en513all7

9. 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
en513all8

10. 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

11. 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 (IEC /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

12. SIPROTEC 7SA522 Quadrilateral Zone Characteristic

13. SIPROTEC 7SA522 MHO Zone Characteristic

14. 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%)

15. 7SA522 - Trip time curves at SIR = 1

16. 7SA522 - Parallel-line compensation: connection and setting

17. 7SA522 - Fault locator

18. 7SA522 - Teleprotection Schemes
Configuration

19. 7SA522 - Phase segregated TeleprotectionZ1
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

20. 7SA522 - Teleprotection with three-terminal lines
Software provides teleprotection of three-terminal lines without additional logic

21. 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
en513ase2

22. 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 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

23. 7SA522 High Resistance Earth Fault Protection (2)
Definite-time characteristic

24. 7SA522 High Resistance Earth Fault Protection (3)
Inverse-time characteristic: IEC

25. 7SA522 High Resistance Earth Fault Protection (4)

26. 7SA522 High Resistance Earth Fault Protection (5)

27. 7SA522 High Resistance Earth Fault Protection (6)
Tripping characteristic Logarithmic Inverse t
T3I0pmax (P3145)
T3I0p (P3144)
3I0p(P3140)
Example: t = ln(3I0 / 3I0p)
T3I0min
(P3141)
3I0p Startpoint(P3154)
3I0 / 3I0p

28. 7SA522 High Resistance Earth Fault Protection (6)
Filter characteristic for stages 3I0>>> and 3I0>>

29. 7SA522 High Resistance Earth Fault Protection (7)
Filter characteristic for stages 3I0> and Inverse time stage

30. 7SA522 - STUB protection for 11/2-circuit breaker arrangement
Release of STUB-stage with open line isolator:

31. 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