SIEMENS Siprotec 4 Protection Relay

The SIPROTEC 7SA6 distance protection relay is a universal relay for protection, control and automation with a graphic display on the basis of the SIPROTEC 4 system. Its high level of flexibility makes it suitable to be implemented at all voltage levels. With this relay you are ideally equipped for the future: it offers security of investment and also saves on operating costs.

High-speed tripping time

Impedance setting range allows very small settings for the protection of very short lines

Self-setting detection for power swing frequencies up to 7 Hz

Current transformer saturation detector prevents non-selective trapping by distance protection in the event of CT saturation.

Phase-segregated teleportation for improved selectivity and availability

Digital relay-to-relay communication by means of an integrated serial protection data interface

Adaptive auto-reclosure (ADT)

Protection functions

• Non-switched distance protection with 6 measuring systems (21/21N)
• High resistance earth-fault protection for single and three-phase tripping (50N, 51N, 67N)
• Earth-fault detection in isolated and resonant-earthed networks
• Tele (pilot) protection (85)
• Fault locator (FL)
• Power-swing detection/tripping (68/68T)
• Phase-overcurrent protection (50/51)
• STUB bus overcurrent protection (50STUB)
• Switch-onto-fault protection(50HS)
• STUB bus overcurrent protection (50STUB)
• Overvoltage/undervoltage protection(59/27)
• Over/underfrequency protection (81O/U)
• Auto-reclosure (79)
• Synchro-check (25)
• Breaker failure protection (50BF)
• Thermal overload protection (49)

Control functions

• Commands for control of c.b. and isolators

Monitoring functions

• Trip circuit supervision (74TC)
• Self-supervision of the relay
• Measured-value supervision
• Event logging
• Fault logging
• Oscillographic fault recording
• Switching statistics

Front Design

• Easy operation with numeric keys
• Function keys
• LEDs for local alarm
• PC front port for convenient relay setting

Communication interfaces

• Front interface for connecting a PC
• System interface for connecting to a control system via various protocols
  • IEC 60870-5-103 protocol
  • PROFIBUS-FMS/-DP
  • DNP 3.0
  • IEC 61850 Ethernet
• 1 serial protection data interface for teleportation
• Rear-side service/modem interface

• Busbar differential protection
• Selective zone tripping
• Very short tripping time (<15 ms)
• Extreme stability against external fault, short saturation-free time (2 ms)
• Phase-segregated measuring systems
• Integrated check zone
• 48 bays can be configured
• 12 busbar sections can be protected
• Bay-selective intertripping

• Breaker failure protection (single-phase with/without current)
• 5 operation modes, selectable per bay
• Separate parameterization possible for busbar and line faults
• Independently settable delay times for all operation modes
• 2-stage operation bay trip repeat/trip busbar
• Intertrip facility (via teleprotection interface)
• Low-current mode using the circuitbreaker auxiliary contacts

• End-fault protection with intertrip or bus zone trip
• Backup overcurrent protection per bay unit (definite-time or inverse-time)
• Independent breaker failure protection per bay unit

• Distributed or centralized installation
• Easy expansion capability
• Integrated commissioning aids
• Centralized user-friendly configuration/parameterization with DIGSI
• Universal hardware

• FO interface
   IEC 60870-5-103 protocol

• Electrical interface
   IEC 61850 protocol with EN 100 module (firmware V4.6

The SIPROTEC 7SA522 relay provides full-scheme distance protection and incorporates all functions usually required for the protection of a power line. The relay is designed to provide fast and selective fault clearance on transmission and subtransmission cables and overhead lines with or without series capacitor compensation. The power system star point can be solid or resistance grounded (earthed), resonant-earthed via Peterson coil or isolated. The SIPROTEC 7SA522 is suitable for single-pole and three-pole tripping applications with and without tele (pilot) protection schemes.

The SIPROTEC 7SA522 incorporates several protective functions usually required for transmission line protection.

• High-speed tripping time
• Suitable for cables and overhead lines with or without series capacitor compensation
• Self-setting power swing detection for power swing frequencies up to 7 Hz
• Digital relay-to-relay communication for two and three terminal topologies
• Adaptive auto-reclosure (ADT)

• Non-switched distance protection with 6 measuring systems (21/21N)
• High resistance ground (earth)-fault protection for single and three-phase tripping (50N, 51N, 67N)
• Tele (pilot) protection (85)
• Fault locator (FL)
• Power swing detection / tripping (68/68T)
• Phase-overcurrent protection (50/51)
• STUB bus overcurrent protection (50STUB)
• Switch-onto-fault protection (50HS)
• Over/undervoltage protection (59/27)
• Over/underfrequency protection (81O/U)
• Auto-reclosure (79)
• Synchro-check (25)
• Breaker failure protection (50BF)

• Commands for control of CB and isolators

• Trip circuit supervision (74TC)
• Self-supervision of the relay
• Measured-value supervision
• Event logging/fault logging
• Oscillographic fault recording
• Switching statistics

• User-friendly local operation with numeric keys
• LEDs for local alarm
• PC front port for convenient relay setting
• Function keys

• Front interface for connecting a PC

• System interface for connecting to a control system via various protocols
  - IEC 61850 Ethernet
  - IEC 60870-5-103 protocol
  - PROFIBUS-FMS/-DP
  - DNP 3.0

• 2 serial protection data interfaces for tele (pilot) protection
• Rear-side service/modem interface
• Time synchronisation via IRIG B or DCF77 or system interface

• Binary inputs: 8/16/24
• Output relays: 16/24/32
• High-speed trip outputs: 5 (optional)

• Overcurrent protection (definite-time/inverse-time/user-def.)
• Directional overcurrent protection (definite-time/inverse-time/user-def.)
• Sensitive dir. earth-fault detection
• Displacement voltage
• Intermittent earth-fault protection
• Directional intermittent ground fault protection
• High-impedance restricted earth fault
• Inrush restraint
• Motor protection
• Overload protection
• Temperature monitoring
• Under-/overvoltage protection
• Under-/overfrequency protection
• Rate-of-frequency-change protection
• Power protection (e.g. reverse, factor)
• Undervoltage controlled reactive power protection
• Breaker failure protection
• Negative-sequence protection
• Phase-sequence monitoring
• Synchro-check
• Auto-reclosure
• Fault locator
• Lockout

• Commands for control of a circuit-breaker and of isolators
• Position of switching elements is shown on the graphic display
• Control via keyboard, binary inputs, DIGSI 4 or SCADA system
• User-defined logic with CFC (e.g. interlocking)

• Operational measured values V,l,f
• Energy metering values Wp,Wq
• Circuit-breaker wear monitoring
• Slave pointer
• Trip circuit supervision
• Fuse failure monitor
• 8 oscillographic fault records
• Motor Statistics

• System interface
  – IEC 60870-5-103/ IEC 61850
  – PROFIBUS-FMS/-DP
  – DNP 3.0/MODBUS RTU

• Service interface for DIGSI 4 (modem)
• Front interface for DIGSI 4
• Time synchronization via IRIG B/DCF77

• 4 current transformers
• 3/4 voltage transformers
• 8/11 binary inputs
• 8/6 output relays

• Differential protection for universal use with power lines and cables on all voltage levels with phase-segregated measurement (87L)
• Two line ends capability
• Suitable for transformers in protected zone (87T)
• Restricted earth-fault protection (87N) if a transformer is within the protection zone
• Well-suited for serial compensated lines
• Two independent differential stages: one stage for sensitive measuring for high resistance faults and one stage for high current faults and fast fault clearance
• Breaker-failure protection (50BF)
• Phase and earth overcurrent protection with directional element (50, 50N, 51, 51N, 67, 67N)
• Phase-selective intertripping (85)
• Overload protection (49)
• Over/undervoltage protection (59/27)
• Over/underfrequency protection (81O/U)
• Auto-reclosure single/three-pole (79)

• Command inputs for control of CB and disconnectors (isolators)

• Self-supervision of the relay
• Trip circuit supervision (74TC)
• 8 oscillographic fault records
• CT-secondary current supervision
• Event logging / fault logging
• Switching statistics

• User-friendly local operation
• PC front port for convenient relay setting
• Function keys and 8 LEDs for local alarm

• 1 serial protection data (R2R) interface

• Front interface for PC connection

• System interface
  - IEC 61850 Ethernet
  - IEC 60870-5-103 protocol
  - PROFIBUS-DP, DNP 3.0 and MODBUS

• Service / modem interface (rear)

• Time synchronization via IRIG-B, DCF77 or system interface

• Browser-based commissioning tool
• Direct connection to digital communication networks

Electric arcs are among the most dreaded fault scenarios in power supply engineering. They can be caused by a multitude of factors, such as aging of the insulation, environmental conditions as well as operating errors. Electric arcs can cause heavy damage to switchgear and present a serious hazard to operating personnel.

The SIPROTEC 5 arc protection detects electric arcs through an optical sensor. Arcs are detected reliably and quickly as they develop, and the protective device can trip immediately and without delay times.The arc protection module is part of the new SIPROTEC 5 series of modular, flexible and intelligent bay devices and can be used in the following device types:

• SIPROTEC 7SJ8
• SIPROTEC 7SA8
• SIPROTEC 7SD8
• SIPROTEC 7SL8
• SIPROTEC 7VK8
• SIPROTEC 7UT8
• SIPROTEC 7SK8
• SIPROTEC 7UM8

Functions:

• Reliable arc detection
• Extremely fast tripping time
• Minimization of thermal damage
• Higher personal safety
• Minimization of downtimes
• EMI safety thanks to purely optical sensors
• Quick and easy retrofitting

• Single and/or three-pole auto-reclosure
• Synchro-check with live/dead line/bus measurement
• Closing under asynchronous conditions (consideration of CB operating time)
• Circuit-breaker failure protection with two stages (single and three-pole with/without current)
• End-fault protection
• Pole-discrepancy protection
• Overvoltage/undervoltage protection

• Commands f. ctrl. of CB and isolators

• Operational measured values
• Self-supervision of the relay
• Event buffer and fault protocols
• Oscillographic fault recording
• Monitoring of CB auxiliary contacts
• Switching statistics

• All functions can be used separately
• Initiation/start by phase-segregated or 3-pole trip commands
• Auto-reclosure for max. 8 reclose cycles
• Evolving/sequential trip recognition
• Auto-reclosure with ADT, DLC, RDT
• Synchro-check with ΔV, Δ , Δf measurement
• Breaker failure protection with highly secure 2-out-of-4 current check detectors
• Breaker failure protection with short reset time and negligible overshoot time

• Front interface for connecting a PC

• System interface for connecting to a control system via various protocols
  – IEC 61850 Ethernet
  – IEC 60870-5-103 protocol
  – PROFIBUS-FMS/-DP
  – DNP 3.0

• Rear-side service/modem interface

• Time synchronization via
  – IRIG-B or DCF77 or system interface

The 7SD5 relay provides full scheme differential protection and incorporates all functions usually required for the protection of power lines. It is designed for all power and distribution levels and protects lines with two up to six line ends. The relay is designed to provide high-speed and phase-selective fault clearance. The relay uses fiber-optic cables or digital communication networks to exchange telegrams and includes special features for the use in multiplexed communication networks. Also, pilot wires connections can be used with an external converter. This contributes toward improved reliability and availability of the electrical power system. The relay is suitable for single and three-phase tripping applications for two up to six line ends.

The 7SD5 has the following features:

• 2 full-scheme main protections in one unit (differential and distance protection)
• High-speed tripping 10 – 15 ms
• The serial protection interfaces (R2R interfaces) of the relays can flexibly be adapted to the requirements of all communication media available.
• If the communication method is changed, flexible retrofitting of communication modules to the existing configuration is possible.
• Tolerates loss of one data connection in a ring topology (routing in 120 ms). The differential protection scheme is fully available in a chain topology.
• Tolerates loss of one data connection in a ring topology (routing in 120 ms). The differential protection scheme is fully available in a chain topology.
• Browser-based commissioning tool.
• Fault locator for one and two terminal measurements for high accuracy on long lines with high load and high fault resistance.
• Capacitive charge current compensation increases the sensitivity of the differential protection on cables and long lines.

Protection Functions

• Differential protection with phase segregated measurement (87L, 87T)
• Restricted ground-fault protection (87N) if a transformer is within the protection zone
• Sensitive measuring stage for high-resistance faults
• Non-switched distance protection with 6 measuring systems (21/21N)
• High resistance ground (earth)-fault protection for single and three-pole tripping (50N/51N/67N)
• Phase-selective inter-tripping (85)
• Ground-fault detection in isolated and resonant-grounded networks
• Tele (pilot) protection (85/21, 85/67N)
• Weak-infeed protection (27WI)
• Fault locator (FL)
• Power swing detection/tripping (68/68T)
• 3-stage overcurrent protection (50, 50N, 51, 51N)
• STUB bus protection (50 STUB)
• Switch-onto-fault protection (50HS)
• Over/under voltage protection (59/27)
• Over/under frequency protection (81O/U)
• Auto-reclosure (79), Synchro-check (25)
• Breaker failure protection (50BF)
• Overload protection (49)
• Lockout function (86)

Control functions

• Commands for control of circuit-breakers (isolators)

Monitoring functions

• Self-supervision of relay and protection data (R2R) communication
• Trip circuit supervision (74TC)
• Measured-value supervision
• Time metering of operating hours
• Oscillographic fault recording
• Event logging/fault logging
• Switching Statistics

Front design

• User-friendly local operation
• PC front port for relay setting
• Function keys and 14 LEDs f. local alarm

• Overcurrent protection
• Directional overcurrent protection
• Sensitive dir./non-dir. earth-fault detection
• Displacement voltage
• Intermittent earth-fault protection
• Directional intermittent ground fault protection
• High-impedance restricted earth fault
• Inrush restraint
• Motor protection
• Overload protection
• Temperature monitoring
• Under-/overvoltage protection
• Under-/overfrequency protection
• Rate-of-frequency-change protection
• Power protection (e.g. reverse, factor)
• Undervoltage-controlled reactive power protection
• Breaker failure protection
• Negative-sequence protection
• Phase-sequence monitoring
• Synchronization
• Auto-reclosure
• Fault locator
• Lockout

• Flexible number of switching devices
• Position of switching elements is shown on the graphic display
• Local/remote switching via keyoperated switch
• Control via keyboard, binary inputs, DIGSI 4 or SCADA system
• Extended User-defined logic with CFC (e.g. interlocking)

• Operational measured values V, I, f,...
• Energy metering values Wp,Wq
• Circuit-breaker wear monitoring
• Slave pointer
• Trip circuit supervision
• Fuse failure monitor
• 8 oscillographic fault records
• Motor Statistics

• System interface
  – IEC 60870-5-103/ IEC 61850
  – PROFIBUS-FMS/-DP
  – DNP 3.0/DNP3 TCP/MODBUS RTU

• Service interface for DIGSI 4 (modem)
• Additional interface for temperature detection (RTD-box)
• Front interface for DIGSI 4
• Time synchronization via IRIG B/DCF77