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Shunt Reactors for Medium and
High-Voltage Networks
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Shunt ReactorsShunt reactors are used for various
areas of application:
Compensation of capacitivereactance of transmission cables, in
particular in networks with light or
no load.
R eduction of system-frequency
overvoltages when a sudden load
drop or no load occurs.
Im provement of the stability and
efficiency of energy transmission.
Two type of shunt reactors are
manufactured:
W ith iron core divided by air gaps
Without iron core, with magnetic
return circuit.
The shunt reactors offer individual
problem solutions:
They satisfy all the specified
requirements regarding voltage,
rating, type of operation, low-noise
and low-loss levels, connection
method and type of cooling, as well
as transportation and installation.
Versatile
View into a 60-Mvar three-phaseshunt reactor:
420 kV, O NA N type of cooling(section model)
Components
Five-limb core(The wound limbsconsist of radiallylaminated packageswith ai r gapsinbetween.)
Winding
TankRadiators
Bushings
Conservator
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2
34
5
6
4
5
6
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Precision Manufactured in All Designs
Windings, insulation, tank,monitoring devices and con-nection method are the sameas those found in the con-struction of transformers.However shunt reactors havesome special structural fea-tures and master certain pro-blems due to physical factorsdifferently.
O il-fi lled shunt reactors arenormally made with O N A Ncooling, for high ratings alsowith O N A F cooling.
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Accuracy in production is essential:
M aking low-vibration cores withradially laminated iron packages withparticularly hard air-gap m aterial.
Coil and core assembly:
33.3 M var single-phase shunt reactor500 / 3 kV.
Types of shunt reactors:
a) S ingle-phase type wi th and wi thoutiron core and with magnetic returncircuit..b) T hree-phase type wi th iron core,wit h and without m agnetic returncircuit.
Detail of an iron core divided byair gaps:
Production has to satisfy verystringent standards to meet thespecified tolerances.
Assembly of the iron corecomponents:
Insertion of the radially laminatedlimb column.
1
2
3
a
b
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Exemplary in Operation
O ur Com pany can look backon more than a century of experience in the sector of transformers as the construc-tion of shunt reactors has pro-ved. In the course of the yearswe came up with many con-structive solutions. The ex-amples of applications listedbelow give some idea of thevarious technical implementa-
tions.
For the 275 kV network in Kuwait:
250 M var three-phase shunt reactor,50 Hz frequency, O N A F cooling withcable connection box. For testing, theboxes are turned and bushingsinserted.
Designed for very low noiseemissions and compactdimensions:
150 M var shunt reactor, 345 kV.
Figure on the left: w ith sound-damping hood, sound pressurelevel of 59 dB( A ) m easured at adistance of 0.3 m .Figure below: wi thout hood, withseparate radiator bank.
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Unit with reduced overall losses:
110 M var shunt reactor, 400 kV, withattached radiators, O N A N cooling.
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Siemens is one of the worldsleading suppliers of shunt re-actors. This is confirmed bythe great number of units soldwith voltages of up to 735 kVand ratings up to 250 M var.
For the 400 kV cable network in J iddah, Saudi-Arabia:
250 M var three-phase shunt reactors,60 Hz, O N AF cooling.
Close By All Over the World
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In the UHV test bay in Nuremberg(Figure on the left):
135 M var three-phase shunt reactor,525 kV, being successfully tested andsituated in Canada (Figure below).
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Up to the highest voltages:
110 M var single-phase shunt reactors,735/ 3 kV for Canada.
For operation in the Danish high-
voltage network:60 M var shunt reactor, 420 kV, O NA Ncooling.
Two 115-tonne consignments
for overseas:Loading one of the 250 M var three-phase shunt reactors on a ship inRotterdam.
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