Shunt reactors for medium and high-voltage networks:From development to use

Power Transmission and Distribution

View into a 60-MVar three-phase shunt reactor:420 kV, ONAN cooling(section model M1 : 20).

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Components:Five-limb core(the wound limbs consist of radiallylaminated packages. Air gaps havebeen added between the packages)

Winding

Tank

Radiators

Bushings

Conservator

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A safe power supply requires a well-developedsupply network. We at Siemens make a decisivecontribution to this worldwide. With the mostmodern technology, the highest quality andreliability. Our program includes transformersfor power plants, transformer substations andHVDC plants, special transformers for industryand traffic, shunt reactors and accessories.

More stability and efficiency for your net-workShunt reactors for medium and high-voltagenetworks improve the stability and efficiencyof the power transmission. Siemens ranksamong the leading suppliers worldwide ofthese reactors – with a reference program ofsold units with voltages up to 735 kV andratings up to 250 MVar. Our company can notonly look back on more than a century of ex-perience gained in constructing shunt reactors.We can also offer our customers the mostconstructive solutions to meet their require-ments.

Present worldwideWith locations on three continents, as well asa worldwide sales and service network, we areright there where you need us. This is alsowhat we mean by reliability.

Designed to transform. Made to perform.

From the beginning up to today –more quality and reliability for your network

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Shunt reactors:

An all-round view of fields of application,construction and production

Shunt reactors carry out different types of tasks:

They compensate the capacitive reactive power of the transmission cables, in particular in networkswith only light loads or no load.

They reduce system-frequency overvoltages whena sudden load drop occurs or there is no load.

They improve the stability and efficiency of the energy transmission.

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Made for every requirement

Our oil-filled shunt reactors are manufactured intwo versions:

With an iron core divided by air gaps

Without an iron core, with a magnetic return circuit.

Shunt reactors offer individual solutions: They satisfyall the specified requirements regarding voltage,rating, type of operation, low-noise and low-losslevels, connection method and type of cooling, aswell as transportation and installation.

Precision manufacturedin all designs

The windings, insulation, tank, monitoring devicesand connection method are practically the same asthose found in the construction of transformers.However, shunt reactors have some special featureswith regard to their design and their mastery ofcertain physical properties.

Oil-filled shunt reactors are generally made withONAN cooling systems and, for high ratings alsowith ONAF cooling systems.

Active part:

33.3-MVar single-phase shunt reactor,500 / √3 kV.

Detailed view of aniron core divided byair gaps:

Production has tosatisfy very stringentstandards to meet thespecified tolerances.

Assembly of the ironcore components:

Insertion of the ra-dially laminated limbcolumn.

Types of shunt reactors:

a) One-phase design withand without iron core andmagnetic return circuit.

b) Three-phase designwith iron core, with andwithout magnetic returncircuit.

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Accurate production processes are the basis:

The manufacture of low-vibration cores from radially laminatediron packages with particularly hard air-gap material.

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Whether for low noise emissions and compact

dimensions or for very high voltages, whether for

a 400-kV cable network in Saudi-Arabia or for a

275-kV network in Kuwait – we have a wide range

of different technical versions of shunt reactors.

This is proved on the one hand by the large number

of units sold with voltages up to 735 kV and ratings

up to 250 MVar. And on the other hand, by the

very different types of applications and locations

around the world.

Designed for very low noise emissions and com-pact dimensions:

150-MVar shunt reactor, 345 kV.

Figure 1 with sound-damping hood, sound pressurelevel of 59 dB (A), measured at a distance of 0.3 m.

Figure 2 without hood, with a separate radiatorbank.

Up to very high voltages:

110-MVar single-phase shuntreactor, 735 / √3 kV for Canada.

Siemens shunt reactors –

In use around the world

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Version with reduced overall losses:

110-MVar shunt reactor, 400 kV, withattached radiators, ONAN cooling.

In the high-voltage test bay inNuremberg:

135-MVar three-phase shunt re-actor, 525 kV, after successfultesting according to all requiredstandards.

For operation in the Danishhigh-voltage network:

60-MVar shunt reactor,420 kV, ONAN cooling.

For the 400-kVJeddah cablenetwork inSaudi-Arabia:

Two of the four250-MVar shuntreactors supplied bySiemens, 60 Hz,ONAF cooling.

For direct connection to thetransmission cable:

40-MVar three-phase shuntreactor, 110 kV.

For the 275-kVnetwork in Kuwait:

250-MVar three-phaseshunt reactor, frequen-cy 50 Hz, ONAF coolingwith cable connectionbox. For testing, theboxes are turned andbushings inserted.

Siemens AGPower Transmissionand DistributionTransformers DivisionKatzwanger Straße 15090461 NürnbergGermany

www.siemens.com/ptd

Subject to change without prior notice

Order No. E50001-U410-A103-X-7600Printed in GermanyDispo-Stelle 1920061C6114 TV/Br 101363 WS 06051.

If you have any questions aboutPower Transmission and Distribution, our CustomerSupport Center is available around the clock.Tel.: +49 180 / 524 70 00Fax: +49 180 / 524 24 71E-Mail: ptd.support@siemens.comwww.siemens.com/ptd-support

(Subject to chargee.g. 12 ct/min)

The information in this document containsgeneral descriptions of the technical optionsavailable, which do not always have to bepresent in individual cases.The required features should therefore bespecified in each individual case at the timeof closing the contract.