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Features • Compact design
• Perfectly matched for the REG216/
REG316*4
• Provides protection of the whole stator
winding including the neutral point
• Continuous supervision of the injection
voltage and the primary earthing system
• Suitable for two separate earthing points
within the protected zone
• Continuous self-supervision of the injection
signal with respect to amplitude and fre-
quency
• Auxiliary DC power supply from station bat-
tery from 36 to 312 V DC
• Applicable for all commonly used earthing-
and excitation-systems for generators
• Continuous supervision of the insulation
resistance and calculation of the earth fault
resistance
• The principle is based on the well-known
offset method, using injection of a low
frequency signal
• Suitable for updating existing plants
• Insensitive to external disturbances
Application The unit is applied for the protection of gen-
erators in block configuration for earth faults
on the generator side. For the implementation
of the 100% stator and rotor earth fault
protection using a REG216/316*4, an injec-
tion unit REX010 and the injection trans-
former REX011 are required. This injection
equipment can be applied to all common
generator earthing- and excitation-systems.
The protection is active during all states of
the machine, standstill as well as run-up and
run-down
Auxiliary unit for REG216/316*4
for 100% stator and rotor earth
fault protection
REX010/011
1MRB520123-Ben
Issued: June 2002
Changed since: November 1999
Data subject to change without notice
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