Distance protection

Distance protection – SIPROTEC 7SA87

SIPROTEC 7SA87

Modular SIPROTEC 7SA87 distance protection for high-voltage lines with 1-pole or 3-pole tripping.

Distance protection SIPROTEC 7SA87

Features & functions

With its modular structure, flexibility and the powerful DIGSI 5 engineering tool, the SIPROTEC 7SA87 device offers future-oriented solutions for protection, control, automation, monitoring and PQ basic.

Features

Main function:

Tripping:

  • 1-pole and 3-pole, minimum tripping time: 9 ms

Inputs and outputs:

12 predefined standard variants with

  • 4/4 or 8/8 current transformers / voltage transformers,
  • 5 to 31 binary inputs, 
  • 8 to 46 binary outputs

Hardware flexibility:

  • Flexibly adjustable I/O quantity structure within the scope of the SIPROTEC 5 modular system

Width of housing:

  • 1/3 × 19 inches to 2/1 × 19 inches

As standard:

Functions

DIGSI 5 permits all functions to be configured and combined as required.

  • Minimum tripping time: 9 ms
  • 6 independent measuring loops (6-system distance protection)
  • Several distance-protection functions can be selected: Classic, reactance method (RMD), impedance protection for transformers
  • Directional backup protection and various additional functions
  • Detection of ground faults of any type in compensated or isolated electrical power systems using the following functions: 3I0>, V0>, transient ground fault, cos φ, sin φ, dir. Detection of intermittent ground faults harmonic detection and admittance measurement
  • Ground fault detection using the pulse detection method
  • Adaptive power-swing blocking, out-of-step protection
  • Detection of current-transformer saturation for fast tripping with high accuracy
  • Fault locator Plus for accurate fault location with inhomogenous line sections and targeted automatic overhead line section reclosing (AREC)
  • Arc protection
  • Automatic frequency relief for underfrequency load shedding, taking changed infeed conditions due to decentralized power generation into consideration
  • Power protection, configurable as active or reactive power protection
  • Directional reactive power undervoltage protection (QU protection)
  • Detection of current and voltage signals up to the 50th harmonic with high accuracy for selected protection functions (such as thermal overload protection) and operational measured values
  • PQ-Basic: voltage unbalance; voltage changes: overvoltage, dip, interruption; TDD, THD and Harmonics

  • 1-pole automatic reclosing function with detection secondary arc (SAD)
  • Point-on-wave switching
  • Control, synchrocheck and switchgear interlocking protection
  • Graphical logic editor to create powerful automation functions in the device
  • Single-line representation in small or large display
  • Integrated electrical Ethernet RJ45 for DIGSI 5 and IEC 61850 (reporting and GOOSE)
  • Up to 4 pluggable communication modules, usable for different and redundant protocols (IEC 61850-8-1, IEC 61850-9-2 Client, IEC 60870-5-103, IEC 60870-5-104, Modbus TCP, DNP3 serial and TCP, PROFINET IO, PROFINET IO S2 redundancy)
  • Virtual network sharing (IEEE 802.1Q - VLAN)
  • Serial protection data communication via optical fibers, two-wire connections and communication networks (IEEE C37.94, and others), including automatic switchover between ring and chain topology
  • Reliable data transmission via PRP and HSR redundancy protocols
  • Extensive cybersecurity functionality, such as role-based access control (RBAC), protocolling security-related events, signed firmware or authenticated network access IEEE 802.1X
  • Simple, quick and secure access to the device via a standard Web browser to display all information and diagnostic data, as well as vector diagrams, single-line and device display pages
  • Phasor measurement unit (PMU) for synchrophasor measured values and IEEE C37.118 protocol
  • Time synchronization using IEEE 1588
  • Powerful fault recording (buffer for a max. record time of 80 sec. at 8 kHz or 320 sec. at 2 kHz)
  • Auxiliary functions for simple tests and commissioning
  • Flexibly adjustable I/O quantity structure within the scope of the SIPROTEC 5 modular system

 

Applications

 

Benefits

  • Safety due to powerful protection functions
  • Purposeful and easy handling of devices and software thanks to a user-friendly design
  • Cybersecurity in accordance with NERC CIP and BDEW Whitepaper requirements
  • Highest availability even under extreme environmental conditions by “conformal coating“ of electronic boards
  • Powerful communication components warrant safe and effective solutions
  • Full compatibility between IEC 61850 Editions 1, 2.0 and 2.1
Information

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