The injection unit REX060 is connected to the generator and to IED as shown in figure
155.
Rshunt
GEN
Step-up
Transformer
R
O
T
O
R
E
F
REX060/ RIM module
REG670
4
5
6
3
1
7
I
V
R
N
2
REX061
Generator Protection Panel
R C
ANSI11000014_1_en.vsd
U>
V
inj
8
ANSI11000014 V1 EN-US
Figure 155: Connection of REX060 for rotor earth fault protection
1 Generator unit consisting of a synchronous generator and a step-up transformer
2 Generator field winding
3 Capacitor coupling unit which is used to provide insulation barrier between rotor circuit and injection
equipment
4 Cable used to inject the square-wave signal into the rotor circuit
5 Connection for measurement of injected current. This signal is amplified in REX060 before it is
passed on to IED for evaluation.
6 Connection for measurement of injected voltage. This signal is amplified in REX060 before it is
passed on to IED for evaluation.
7 Two VT inputs into IED which are used to measure injected current and voltage
8 Protection for excessive over-voltages posed by generator. REX060 can withstand without damage
maximum voltage of 120V and when used together with REX062 up to 240V.
The measured impedance Z
Measured
is calculated by the complex equation:
GUID-20ADF3F6-6A89-4B5F-B0DA-9740C4FD5482 V2 EN-US
Where:
Section 8 1MRK 502 071-UUS A
Impedance protection
314 Generator protection REG670 2.2 ANSI and Injection equipment REX060, REX061, REX062
Application manual
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