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SIPROTEC 4
7SA522 Distance Protection for Transmission Lines
Productmanager Distance Protection Michael
Claus EV S V 13 Nürnberg H Phone [phone]
8261 Fax [phone] Email
Michael.Claus_at_nbg6.siemens.de
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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

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7SA522Distance Protection for Transmission Lines
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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 LEDs for user assignment and slot to insert
legend text

• 9-pole
• service interface
• standard cable
• DIGSI 4

Width of housing 1/2 of 19" or 1full 19 rack

• Proven numeric keypad
• secure entry of numbers
• easy password entry

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SIPROTEC 7SA522 Terminals and Communication
Interfaces

• Open to new techniques (methods)
• electric or fibre optic (FO)
• process or 2nd remote relay interface

Width of housing1/2 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

• Time synchronization
• GPS
• with IRIG-B and DCF-77

• Service interface
• electrical or fibre optic (FO)
• DIGSI 4 via Modem

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7SA522Connection Diagram Basic Version

• Optional
• Sensitivity
• normal
• high (5mA)

• Connection
• Ven
• Vsync
• Vx

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7SA522Single Line Diagram
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SIPROTEC 7SA522 Scope of functions (1)
ANSI-No.
21, 21N FL 85-21

• 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-direction
  al
• 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...)

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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
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SIPROTEC 7SA522 Scope of functions (3)
ANSI-No.
50, 5150N-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

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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 interface1 (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
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SIPROTEC 7SA522 Quadrilateral Zone
Characteristic
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SIPROTEC 7SA522 MHO Zone Characteristic
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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)
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7SA522 - Trip time curves at SIR 1
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7SA522 - Parallel-line compensation connection
and setting
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7SA522 - Fault locator
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7SA522 - Teleprotection Schemes
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7SA522 - Phase segregated Teleprotection
2
2
L2-E
Z1
Z1B
L1-E
1
1
B
A
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
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7SA522 - Teleprotection with three-terminal lines
Software provides teleprotection of
three-terminal lines without additional logic
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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
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7SA522High 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 characteristicthis 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

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7SA522 High Resistance Earth Fault Protection (2)
Definite-time characteristic
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7SA522 High Resistance Earth Fault Protection (3)
Inverse-time characteristic IEC
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7SA522 High Resistance Earth Fault Protection (4)
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7SA522 High Resistance Earth Fault Protection (5)
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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)
3I0 / 3I0p
3I0p Startpoint(P3154)
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7SA522 High Resistance Earth Fault Protection (6)
Filter characteristic for stages 3I0gtgtgt and 3I0gtgt

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7SA522 High Resistance Earth Fault Protection (7)
Filter characteristic for stages 3I0gt and
Inverse time stage
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7SA522 - STUB protection for 11/2-circuit breaker
arrangement
Release of STUB-stage with open line isolator
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7SA522 - Monitoring

• Operating system monitoring
• Auxiliary voltage failure
• Measured value detection
• Buffer battery
• HardwareWatchdog
• SoftwareWatchdog
• Working memory
• Program memory
• Parameter memory
• Sampling frequency
• 1/5 Asetting
• 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

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