Motor and generator protection

Motor and generator protection – SIPROTEC 7UM62

SIPROTEC 7UM62 (phase-out product)

The SIPROTEC 7UM62 protection relays can do more than just protect. They also offer numerous additional functions. Be it earth faults, short-circuits, overloads, overvoltage, overfrequency or underfrequency asynchronous conditions, protection relays assure continued operation of power stations. The SIPROTEC 7UM62 protection relay is a compact unit which has been specially developed and designed for the protection of small, medium-sized and large generators.

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Features & functions

Motor and generator protection SIPROTEC 7UM62 (phase-out product)


They integrate all the necessary protection functions and are particularly suited for the protection of :

  • Hydro and pumped-storage generators

  • Co-generation stations

  • Private power stations using regenerative energy sources such as wind or biogases

  • Diesel generator stations

  • Gas-turbine power stations

  • Industrial power stations

  • Conventional steam power stations

The SIPROTEC 7UM62 includes all necessary protection functions for large synchronous and asynchronous motors and for transformers.

The integrated programmable logic functions (continuous function chart CFC) offer the user high flexibility so that generators, motors and transformers adjustments can easily be made to the varying power station requirements on the basis of special system conditions. The flexible communication interfaces are open for modern communication architectures with the control system.

The following basic functions are available for all versions:

  • Current differential protection for generators, motors and transformers

  • Stator earth-fault protection

  • Sensitive earth-fault protection

  • Stator overload protection

  • Overcurrent- time protection (either definite time or inverse time)

  • Definite-time overcurrent protection with directionality, undervoltage and overvoltage protection

  • Underfrequency and overfrequency protection

  • Overexcitation and underexcitation protection

  • External trip coupling

  • Forward-power and reversepower protection

  • Negative-sequence protection

  • Breaker failure protection

  • Rotor earth-faults protection (fn, R-measuring)

  • Motor starting time supervision and restart inhibit for motors



  • 8 current transformers

  • 4 voltage transformers
  • 7/15 binary inputs

  • 12/20 binary outputs
  • Text or graphic display
  • Surface-mounting or flush-mounting housing


Communication interfaces

  • System port 
    – IEC 61850

    – IEC 60870-5-103 

    – DNP 3.0


    – 2 analog outputs 0 - 20 mA

  • 2 service ports

    – DIGSI 4

    – Modem

    – Thermobox

    – 2 analog outputs 0 - 20 mA

  • Front port

    – DIGSI 4

  • Time synchronization via IRIG B, DCF77 or system interface


Standard version
Scope of basic version plus:

  • Inadvertent energization protection

  • 100 %-stator earth-fault protection with 3rd harmonic

  • Impedance protection

Full version 
Scope of standard version plus:

  • DC voltage protection

  • Overcurrent protection during start-ups

  • Earth-current differential protection

  • Out-of-step protection

Additional version
Available for each version:

  • Sensitive rotor earth-fault protection (1-3 Hz method)

  • Stator earth-fault protection with 20 Hz voltage

  • Rate-of-frequency-change protection

  • Vector jump supervision

Monitoring functions

  • Trip circuit supervision

  • Fuse failure monitor

  • Operational measured values V, I, f,…

  • Every metering value Wp,Wq

  • Time metering of operation hours

  • Self-supervision of relay

  • 8 oscillographic fault records

Front design

  • User-friendly local operation

  • 7/14 LEDs for local alarm

  • Function keys

  • Graphic display with 7UM623


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