Line differential and distance protection

Main function:

• Differential protection and distance protection for medium-voltage and high voltage applications
  
• Interoperability of SIPROTEC 5 and SIPROTEC 4 line protection devices

Tripping:

• 3-pole, minimum tripping time: 19 ms
  

Inputs and outputs:

• 4 current transformers,
• 4 voltage transformers,
• 11 or 23 binary inputs, 
• 9 or 16 binary outputs

Hardware flexibility:

• Different hardware quantity structures for binary inputs and outputs are available in the 1/3 base module. Adding 1/6 expansion modules is not possible; available with large or small display.

Housing width:

• 1/3 × 19 inches

As standard:

• Conformal coating

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

• Minimum tripping time: 19 ms
• Main protection function is differential protection with adaptive algorithm for maximum sensitivity and stabilityeven with the most different transformer errors, current-transformer saturation and capacitive charging currents
• Several distance-protection functions selectable as backup protection or secondary main protection: 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
• Detection of current-transformer saturation for fast tripping with high accuracy
• Adaptive power-swing blocking
  
• 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
• 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
• 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)
• 2 optional pluggable communication modules, usable for different and redundant protocols (IEC 61850-8-1, IEC 60870-5-103, IEC 60870-5-104, Modbus TCP, DNP3 serial and TCP, PROFINET IO)
• Serial protection data communication via optical fibers, two-wire connections and communication networks (SDH networks, MPLS electrical power systems, for example using 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

• Line protection for all voltage levels with 3-pole tripping
• Phase-selective protection of overhead lines and cables with single-ended and multi-ended infeed of all lengths with up to 6 line ends
• Transformers and compensating coils in the protection zone
• Detection of ground faults in isolated or arc-suppression-coil-ground power systems in star, ring, or meshed arrangement
• Serial protection communication with SIPROTEC 5 and SIPROTEC 4 devices over different distances and physical media, such as optical fiber, two-wire connections, and communication networks 
• Phasor Measurement Unit (PMU)
• Acquisition and recording of power quality data in the medium voltage and subordinate low voltage network
  

• Compact and low-cost line differential and distance protection
• 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
• Full compatibility between IEC 61850 Editions 1, 2.0 and 2.1