Description - SIPROTEC 7UM621 / 2 / 3

Machine protection, automation device for medium to high power machines, differential protection

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.

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

Product homepage - downloads in the internet (catalogs, certificates, firmware, manuals)

https://www.siemens.com/siprotec4