Shunt Reactor
Shunt Reactor
(OP)
Hi everyone, there is a question need your help.
33kV underground XLPE cable, 2000mm2, the length are 20kM.
If we need to consider reactive compensation, how to size/calculate the capacity of shunt reactor?
Are there any textbook or standard we can refer?
Thanks all.
33kV underground XLPE cable, 2000mm2, the length are 20kM.
If we need to consider reactive compensation, how to size/calculate the capacity of shunt reactor?
Are there any textbook or standard we can refer?
Thanks all.






RE: Shunt Reactor
Bill
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"Why not the best?"
Jimmy Carter
RE: Shunt Reactor
RE: Shunt Reactor
RE: Shunt Reactor
Since the conductor cross section area is very large this area is segmented and taped and
insulated strands may be used in order to reduce skin and proximity effect. The conductor diameter including conductor screen is 56-58 mm.
For such a large conductor cross section the rated insulation of 8 mm [according to IEC 60502-2]
it has to be increased to 10 mm and the insulated core diameter has to be 72 to 79 mm.
The single core cable capacity will be 2.3/18/ln(ins.core dia/conductor dia) =0.40-0.47 µF/km [total 8-9.5 µF]. The average reactance will be approximate 300 ohm Icap=33000/sqrt(3)/300=63.5 A and the reactive power 3.63 MVAR.
As it is known the receive end voltage Vr=Vs/(1-w^2*C*L/2).
Considering 300 mm distance center-line to center line between phases[in flat formation]
L=2*(ln(2*s/dcond)+1/4)/10^4 H/km s=2^(1/3)*300=378 mm L=0.0005705 H/km[total=0.011411 H].
w=2*π*60=378 rad/sec then:
Vr=33/(1-378^2*0.011411*9.5/10^6/2)=33/.992 kV
The Ferranti Effect is insignificant, in my opinion.