7UM62 Generator Protection Relay

the siprotec 4 7um62 protection relays can do more than just protect. They also offer numerous additional functions. Be it earth faults, short-circuits, overloads, over voltage, over frequency or under frequency asynchronous conditions, protection relays assure continued operation of power stations. The siprotec 4 7um62 protection relay is a compact unit which has been specially developed and designed for the protection of small, medium-sized and large generators.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 stationsthe siprotec 4 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-undervoltage and overvoltage protection-underfrequency and over frequency protection-external trip coupling- forward-power and reverse power protection-negative-sequence protection-breaker failure protection-rotor earth-faults protection (fn, r-measuring)motor starting time supervision and restart inhibit for motors

functions

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,…