Functions

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

• Directional and non-directional overcurrent protection with additional functions
• Protection of up to 9 feeders with up to 40 analog inputs
• Optimized tripping times due to directional comparison and protection data communication
• 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
• Detection of intermittent ground faults with automatic blocking of static measuring functions, to avoid message and fault record flooding
• Ground fault detection using the pulse detection method
• Fault locator plus for accurate fault location with inhomogenous line sections and targeted automatic overhead-line section reclosing (AREC)
• Arc protection
• Overvoltage and undervoltage protection
• Power protection, configurable as active or reactive power protection
• Frequency protection and frequency change protection for load shedding applications
• Automatic frequency relief for underfrequency load shedding, taking changed infeed conditions due to decentralized power generation into consideration
• Protection functions for capacitor banks, such as overcurrent, overload, current unbalance, peak overvoltage, or differential 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 peak overvoltage protection for capacitors) and operational measured values
• PQ-Basic: voltage unbalance; voltage changes: overvoltage, dip, interruption; TDD, THD and Harmonics
• Point-on-wave switching
• Control, synchrocheck and switchgear interlocking protection
• Circuit-Breaker Failure Protection
• Circuit breaker reignition monitoring
• Graphical logic editor to create powerful automation functions in the device
• Single-line representation in small or large display
• Fixed 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
• Control of Power Transformers
• 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

Applications

• Detection and selective 3-pole tripping of short circuits in electrical equipment of star networks, lines with infeed at one or two ends, parallel lines and open-circuited or closed ring systems of all voltage levels up to AC 400 V
• Backup protection for differential protection devices of all kind for lines, transformers, generators, motors, and busbars
• Protection and monitoring of capacitor banks
• Phasor Measurement Unit (PMU)
• Reverse-power protection
• Load shedding applications
• Automatic switchover
• Regulation or control of power transformers (two-winding transformers, three-winding transformers, grid coupling transformers)
• Acquisition and recording of power quality data in the medium voltage and subordinate low voltage network

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
• Full compatibility between IEC 61850 Editions 1, 2.0 and 2.1