Setting System Frequency; Setting Stator And Rotor Injection Frequency; Selecting Rotor Gain; Selecting Stator Gain - Hitachi Relion 670 Series Operation Manual

1MRK500127-UUS Rev. M
8.1.5.1

Setting system frequency

Frequency can be set to either 50 or 60 Hz.
1. Use the Up and Down button to select frequency.
2. Store the new frequency by pressing the Enter button, or clear the last chosen frequency by
pressing the Clear button.
8.1.5.2

Setting stator and rotor injection frequency

Frequency can be set as integer in range 50 to 250 Hz for a stator and 75 to 250 Hz for a rotor.
1. Use the keypad to navigate to stator or rotor frequency (row 2 or 4)
2. Press E to enter value change state
3. Use the Up and Down button to select frequency
4. Store the new frequency by pressing the E (Enter) button, or clear the chosen frequency by
pressing the C (Clear) button
8.1.5.3

Selecting rotor gain

Typically, the default Gain 3 is selected for rotating diodes excitation systems, and Gain 2 is selected for
static excitation systems. A higher gain factor (4) may cause saturation in case of single fault in the
exciter circuit. A lower gain factor than the default one can be required by site conditions. The need to
change the default gain factor can be identified either during the ICT calibration procedure or during the
monitoring of the complete sequence of generator operating conditions.
Select rotor gain factor according to the table below.
Table 17:
Gain factor
1
2
3
4
8.1.5.4

Selecting stator gain

Stator gain factor for both voltage and current depends on the highest steady voltage that can occur at
the low voltage terminals of SIT (Signal Injection Transformer) during a stator earth fault.
Select gain factor UmaxEF in accordance with highest voltage that may occur at the low voltage
terminals of SIT. Guidelines are available in the Commissioning manual.
670 series
Operation manual
Rotor gain
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Note
Extreme
Enhanced
Default
Reduced
Section 8
REX060 injection unit LHMI
GUID-D5CB4B02-F5EC-4680-8368-E9BDBAA28BD3 v2
GUID-C068C178-8156-49A3-80CB-22E163973986 v1
GUID-E25C6226-7005-4121-A651-EAFB8A6973A3 v2
GUID-9832871C-6190-4E38-8523-00E322CAA09C v4
79