Coupling devices for rotor ground-fault protection
SIPROTEC 7XR8
Accessories for machine protection devices SIPROTEC 7UM62 and SIPROTEC 7UM85
Coupling Device for Rotor Ground-Fault
7XR81 coupling unit is the necessary accessory for the rotor ground-fault protection with the SIPROTEC 7UM62 and SIPROTEC 7UM85 machine protection relays.
This device replaces the previous 7XR6100-0*A00 coupling unit and the 3PP1336-0DZ series resistor in one device.
Resistor Coupling Unit for 7XT71
7XR8004 resistor coupling unit is the necessary accessory for the 1 to 3 Hz rotor ground-fault protection together with the 7XT71 (1 to 3 Hz) generator and the SIPROTEC 7UM62 and SIPROTEC 7UM85 machine protection relays.
This device replaces the previous 7XR6004-0*A00 resistor unit, allowing higher excitation voltages at a reduced size.
Voltage Divider (5:1, 5:2)
7XR86 coupling unit is used for the 90%-stator ground-fault protection with the SIPROTEC 7UM62 and SIPROTEC 7UM85 machine protection relays.
The voltage divider is necessary at grounding or neutral-transformer application with a higher secondary voltage than 200 V (e.g. 500 V) of the protection relay's voltage-inputs maximum voltage (e.g. 100 V).
This device replaces the previous 3PP1336-1CZ-K2Y (5:1, 5:2 voltage divider) resistor unit. The 7XR86 has the same construction like the 7XR8004. Only the resistors of the 7XR8004 have been replaced.
