Main function:

• Differential and distance protection
• Interoperability of SIPROTEC 5 and SIPROTEC 4 line protection devices

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

Housing width:

• 1/3 × 19 inches to 2/1 × 19 inches

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

• Minimum tripping time: 9 ms
• Main protection function is differential protection with adaptive algorithm for maximum sensitivity and stability even 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
• Adaptive power-swing blocking, out-of-step protection
• 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 detectionusing the pulse detection method
• 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
• 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 61850-9-2Client, 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 (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 cybersecurityfunctionality, 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