7.8.9.1
The injection unit REX060
In
je
ct
io
n
R
ot
o
r
P
S
M
Backplane
Front-plate
Back view
Front view
Power
connector
IED and
Injection
connectors
P
o
w
er
S
ta
to
r
R
o
to
r
In
je
ct
io
n
S
ta
to
r
Top view
HMI with logic
1
1
1
18
18
5
X11
X61
X81
Injection switch
1
5
1
5
X62
X82
Keylock
LED
Injection LED
IEC11000015-1-en.vsd
IEC11000015 V1 EN
Figure 126:
Injection unit REX060
The REX060 unit is a common unit that can be configured for either rotor or stator
earth fault protection, or for both. The REX060 have separate modules for rotor and
stator protection. The REX060 generate square wave signals, where one is used for
injection to the stator neutral point and the other to the field winding circuit (rotor
circuit), if configured for both stator and rotor protection. The injected voltage and
currents are measured by the unit and amplified, resulting in voltage signals both for
the injected voltage and current, and adapted to the analogue inputs of IED. The
injection unit REX060 shall be located close to the IED, preferably in the same
cubicle.
For the Sensitive rotor earth fault protection, there are some settings necessary for
REX060:
•
System frequency: 50/60 Hz
•
Injected frequency for rotor circuit injection is settable in 1 Hz steps 75 – 250 Hz.
•
Gain factor in four steps
REX060 will also continuously check the measured signal for detection of saturation
which could cause error in the evaluation in IED. If saturation level is reached a binary
signal, connected to IED, is activated. Also other errors in the injection circuit will
initiate a binary signal to IED for blocking of the function.
Rotor injection output is protected against high voltages by a relay blocking the
injection circuit. This blocking remains blocked by stored status in non-volatile
memory.
The output is also protected by a fuse. If this fuse is blown, it is caused by external
voltage source, since the injection unit cannot provide enough energy to blow this
fuse.
Refer to the Hardware section in this manual for a detailed description of REX060.
Section 7
1MRK502052-UEN B
Impedance protection
286
Technical manual
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