Connecting And Setting Voltage Inputs - ABB REG670 Applications Manual

1MRK 502 071-UEN -
8.7.3.2
Generator protection REG670 2.2 IEC and Injection equipment REX060, REX061, REX062
Application manual
Frequency, current and voltage gain are settable and stored in non-volatile memory.
If value is out of range, the limit value will be stored. Last stored setting values are
shown in display.
Table 30: Necessary settings for REX060
Setting
System frequency
Injected frequency
Gain factor
Injection frequency can be set as integer in range 75 to 250 Hz for a rotor. When
selected, only one digit can be adjusted at the time by the Up or Down buttons. Store
the new value by Enter button, or alternatively recover the last stored value by Clear
button.
Gain setting can be set in four discreet steps in the main menu. The selected step result
in pre defined voltage and current gain factors. In other words, voltage and current
gain cannot be set independently. Store the new gain by the Enter button, or
alternatively recover to the last stored gain by the Clear button.
Rotor gain factor for both voltage and current is dependent on the highest voltage that
may occur at the injection point (exciter connection) due to disturbances of thyristor
rectifiers and mains frequency from fault in rectifier source.
U max at sensing input is the sum of the maximum allowed voltage that may occur at
the voltage and current sense input points of REX060.
Table 31: Rotor gain
Gain factor
1
2
3
4
Always start with default gain. Other gains shall be used only if requested during
commissioning procedure by the ICT tool.

Connecting and setting voltage inputs

The RIM module of REX060 has two analog output channels that shall be connected
to two voltage input channels of the IED.
If both stator and rotor protection are used, there are two possible methods to perform
the connection.
Impedance protection
Range
50/60 Hz
One set for rotor circuit injection
Four steps for the rotor earth-fault protection
Note
Extreme
Enhanced
Default
Reduced
Section 8
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