ABB Relion Series Product Manual page 20

670/650 series and SAM600-IO IEC
RXTTE4
221 222
R
C
421
ICT
1:10
428
IVT
44,7V
324
325
321
IEC13000028-1-en.vsd
IEC13000028 V1 EN-US
Figure 29. Voltage injection unit RXTTE4 with its main internal
components
Table 2. Rotor earth fault protection based on General current and voltage protection (CVGAPC) and RXTTE4
Function
For machines with:
• rated field voltage up to
• static exciter with rated supply
voltage up to
Supply voltage 120 or 230 V
Operate earth fault resistance
value
Influence of harmonics in the DC
field voltage
Permitted leakage capacitance
Permitted shaft earthing
resistance
Protective resistor
External resistor for RXTTE4
The external resistor is used when either there is a need to
minimize physical exposure of the field circuit or when high
harmonic content of the total injection current can cause
overheating of the built-in RXTTE4 resistor. The external
20
313
230V 50/60Hz
314
120V 50/60Hz
315
0V
Range or value
350 V DC
700 V 50/60 Hz
50/60 Hz
Approx. 1–20 kΩ
Negligible influence of 50 V, 150
Hz or 50 V, 300 Hz
(1–5) μF
Maximum 200 Ω
220 Ω, 100 W, plate
(the height is 160 mm (6,2
inches) and width 135 mm (5,31
inches))
GUID-53080A2D-E836-4827-AD3D-8BD2C1E388D0 v2
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Rotor earth fault protection can be
integrated in the IED among all other
protection functions typically required for
generator protection. How this is achieved
by using COMBIFLEX injection unit
RXTTE4 is described in Instruction
1MRG001910.
resistor is delivered mounted on an insulated plate with
overall dimensions; (the height is 160 mm (6,2 inches) and
width 135 mm (5,31 inches)), suitable for wall mounting, see
figure 30. It actually consists of two resistors (R1 and R2)
which are on delivery connected in series. It is possible to
order two different types of the external resistor. The first
1MRK 514 012-BEN K
SEMOD175176-2 v5
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