Generator protection SIPROTEC 7UM85

Generator protection SIPROTEC 7UM85

Product Overview

Modular SIPROTEC 7UM85 generator protection relays for the protection of generators and power plant units contain all necessary main protection functions and a large number of other protection and monitoring functions.

Features :

Main function:

  • Typical generator protection functions
  • Certification for use in explosive environments (EN 60079-14 or Verband der Elektrotechnik, Elektronik und Informationstechnik 0165, Part 1, ATEX)
  • SIL2 certification of hardware and software for generator reverse protection EN 61508

Inputs and outputs:

5 predefined standard variants with

  • up to 16 current transformers and
  • 8 voltage transformers,
  • 7 to 15 binary inputs,
  • 9 to 20 binary outputs
  • 4 fast measuring transducer inputs (10 V or 20 mA)

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

Width of housing:

  • 1/3 × 19 inches to 2 × 19 inches

As standard:

Functions :

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

  • Short-circuit protection (overcurrent protection, impedance protection, differential protection)
  • Stator ground-fault protection (90% non-directional or directional, 100% with 3rd harmonic, real 100% protection with 20-Hz voltage interference)
  • Rotor ground-fault protection with different measuring methods (ground current or ground-resistance monitoring)
  • High-precision reverse-power protection and universal power protection
  • Underexcitation and overexcitation protection
  • Unbalanced-Load Protection
  • Overload protection and temperature supervision via external RTD unit (with PT 100, for example)
  • Out-of-Step  Protection
  • Rotor and stator overload protection with cold gas consideration (coolant temperature)
  • Power-plant disconnection protection
  • Shaft-current protection (in particular with hydropower applications)
  • Universal overvoltage and undervoltage protection with different measuring methods
  • Overfrequency and underfrequency protection, frequency change protection and monitoring of dwell time in frequency bands as turbine protection (protection against abnormal frequencies)
  • Protection functions for network decoupling (voltage and frequency protection, directional reactive power undervoltage protection (QU protection) and vector-jump protection)
  • Inadvertent energization protection to detect incorrect activation of the circuit breaker
  • Circuit-breaker failure protection
  • Point-on-wave switching
  • Circuit breaker reignition monitoring
  • Single-channel parallel connection function (synchronization) with adjustment commands for rotational speed (frequency) and voltage
  • Graphical logic editor to create powerful automation functions in the device
  • 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)
  • Reliable data transmission via PRP and HSR redundancy protocols
  • PQ-Basic: voltage unbalance; voltage changes: overvoltage, dip, interruption; TDD, THD and
  • Harmonics
  • 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
  • Capturing operational measured variables and protection function measured values for the evaluation of the system, to support commissioning, and to analyze faults
  • Frequency tracked protection functions over a wide frequency range (10 Hz to 80 Hz) and the option to assign the protection functions in a single device to different frequency tracking groups.
  • 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

More Information


+66 2 063 5262-3, +66 83 440 1404