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 134:
Injection unit REX060
The REX060 unit is a common unit with it's own built-in Power Supply Module
(PSM) of the same type as used in the IED that can be equipped for either rotor or stator
earth fault protection, or for both. The REX060 has specific injection modules for
rotor and stator protection. The REX060 generates 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 voltages
and currents are measured by the unit and amplified, giving 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.
For the stator earth fault protection, there are some settings necessary for REX060:
•
System frequency: 50/60 Hz
•
Injected frequency for stator neutral point is settable in 1 Hz steps 50 – 250 Hz.
•
VT/DT maximum fundamental frequency voltage during earth fault in the stator
winding
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 output contact is activated, which is connected to IED. Also other errors in
injection will activate another output contact to IED for blocking the function.
Stator injection output is protected against voltages exceeding maximum operating
range (10% of rated VT/DT) by a relay blocking the injection circuit. This blocking
remains blocked by stored status in non-volatile memory. Note REX060 is designed
to cope with such voltages of up to 120V. When optional REX062 resistor unit is used,
REX060 can cope with voltages of up to 240V at injection point.
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.
1MRK502052-UEN B
Section 7
Impedance protection
301
Technical manual
Summary of Contents for Relion REG670
Page 1: ...Relion 670 series Generator protection REG670 2 0 IEC Technical manual ...
Page 2: ......
Page 44: ...38 ...
Page 58: ...52 ...
Page 80: ...74 ...
Page 106: ...100 ...
Page 482: ...476 ...
Page 548: ...542 ...
Page 570: ...564 ...
Page 600: ...594 ...
Page 608: ...602 ...
Page 630: ...624 ...
Page 862: ...856 ...
Page 1094: ...1088 ...
Page 1226: ...1220 ...
Page 1250: ...1244 ...
Page 1297: ...1291 ...