Motor and generator protection
SIPROTEC 7UM61
The SIPROTEC 7UM61 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, protection relays assure continued operation of power stations. The SIPROTEC 7UM61 protection relay is a compact unit which has been specially developed and designed for the protection of small and medium-sized generators.
Features
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 device can also be used for protecting synchronous and asynchronous motors.
The integrated programmable logic functions (continuous function chart CFC) offer the user high flexibility so that 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.
Hardware
- 4 current transformers
- 4 voltage transformers
- 7/15 binary inputs
- 11/19 binary outputs
- Text display
- Surface-mounting or flush-mounting housing
Communication interfaces
System port
– IEC 60870-5-103
– PROFIBUS-DP
– DNP 3.0– MODBUS RTU
Service port
– DIGSI 4
– Modem
– Thermobox
Front port
– DIGSI 4
Time synchronization via IRIG B, DCF77 or system interface
Functions
Basic version
Stator earth-fault protection
Sensitive earth-fault protection
Stator overload protection
Overcurrent-time protection (either definite-time or inverse-time)
Definite-time overcurrent-time protection, directional
Undervoltage and overvoltage protection
Underfrequency and overfrequency protection
Reverse power protection
Overexcitation protection
External trip coupling
Standard version - Scope of basic version plus
Forward-power protection
Underexcitation protection
Negative-sequence protection
Breaker failure protection
Full version - Scope of standard version plus:
Inadverdent energization protection
100%- stator earth-fault protection with 3rd harmonic
Impedance protection
Asynchronous motor - Scope of standard version plus
Motor starting time supervision
Restart inhibit (without underexcitation protection)
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
