Overcurrent and feeder protection

Main function:

• Feeder and overcurrent protection for all voltage levels

Inputs and outputs:

5 predefined standard variants with

• 4 current transformers, 
• 4 voltage transformers, 
• 11 to 59 binary inputs, 
• 9 to 33 binary outputs

Hardware flexibility:

• Flexibly adjustable and expandable I/O quantity structure within the scope of the modular SIPROTEC 5 system; 1/6 expansion modules can be added, available with large or small display, or without display

Housing width:

• 1/3 × 19 inches to 2/1 × 19 inches

As standard:

• Conformal coating

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, harmonic, dir. Detection of intermittent ground faults and admittance
• 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
• 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 61850-9-2 Merging Unit, 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 (IEEE C37.94, and others), including automatic switchover between ring and chain topology
• Reliable data transmission via PRP and HSR redundancy protocols
• Extensive cyber security functionality, such as role-based access control (RBAC), protocolling security-related events or signed firmware
• Simple, quick and secure access to device data via a standard Web browser – without additional software
• 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

• 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
• 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)

• Safety due to powerful protection functions
• Data security and transparency over the entire lifecycle of the plant, saving time and money
• Purposeful and easy handling of devices and software thanks to a user-friendly design
• Increased reliability and quality of the engineering process
• Cyber security 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 and 2
• High investment security and low operating costs due to future-oriented system solutions