Power Transformers Small, Medium & Large

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A M E M B ER OFT H EA LTR O N G R O U P ALTRON

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State of the Art Transformer

Manufacturing Facility

Experience and Design Capability

Powertech Transformers have many years of experience in the design, manufacturing, installation and commissioning of small, medium and large power transformers for various applications. Our design experience range from Small Power Transformers (SPT – < 60MVA, < 132kV) up to Large Power Transformers (LPT – 800MVA, 400kV) including Generation Step-up Units (GSU’s). In addition all aspects of auxiliary control circuit application and layout designs are also provided. The transformers manufactured by Powertech Transformers range from standard designs in accordance with IEC requirements to complex designs specific for a customer’s individual requirements in the mining, industrial, municipal and power utility industries across the African continent and overseas.

The software available to our designers is a state of the art integrated design system. This includes winding design and optimisation; graphical electromagnetic field line plots; temperature analysis; short circuit stress calculations to full 3D CAD modelling of the transformer and its components. This allows our designers to customise each power transformer to specific customer requirements.

Customer drawings are prepared for tender designs and finalised on order placement. All electrical and mechanical designs undergo an internal design review process. External design reviews by customers are also allowed for in the design process. If a detailed customer specification is not available, Powertech Transformers can offer a cost effective design based on the requirements of IEC 60076 product standards. Powertech Transformers can also provide template technical schedules based on the IEC requirements, should these not be available from the customer.

Quality, Health and Safety

The plant located in Pretoria (Gauteng) is a world class manufacturing facility and boasts a fully certified ISO 9001 quality management system, ISO 14000 environmental management system as well as the OHSAS 18000 health and safety management system. Powertech Transformers in Pretoria also has a fully SANAS accredited metrology laboratory on the premises.

At every stage during manufacturing, materials and processes are inspected by suitably qualified and experienced inspectors to ensure all required standard and manufacturing practices are adhered to. Six Sigma (6␴) systems are built into every manufacturing process in the factory to enhance the quality and its documentation of our products.

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Standard Features of our Power

Transformers

High Quality Materials Sourced from Best Suppliers

Powertech Transformers prides itself in our ability to manufacture most of the transformer structural components in-house. Raw materials and components not manufactured in-house are sourced from world class suppliers. Procurement of material and components is done from a list of pre-qualified suppliers locally and internationally who are certified to conform with the highest standards in terms of Quality (ISO9001), Health and Safety (OHSAS 18000) as well as the Environment (ISO 14000) respectively.

Before a supplier is approved, their capability is assessed, taking into consideration their technical ability; quality control system; safety, health & environmental controls; financial viability as well as other commercial factors. Supply level agreements are put in place with key suppliers to ensure availability of stock and continuity of supply. A number of enterprise development initiatives are considered for development of small independent business units.

Powertech Transformers applies strict control of incoming raw material from pre-qualified suppliers. All incoming goods are quality controlled and checked before they are released into the sub assembly manufacturing lines. Where certification is required, the raw material is sent to our on-site SANAS accredited laboratory for material analysis, verification and certification. Any non-conforming product is rejected and returned to the supplier for rectification or replacement.

Core Design and Manufacturing

Core design principle is based on achieving the smallest active part possible whilst achieving low noise level, low no-load losses and ensuring high short circuit withstand capability of the overall core structure. The basic core design is either a three-limb or a five-limb type core. The core is composed of a circular cross-section without any bolts through the core. The joints are mitred and step-lap stacked.

Selection of core steel material for a particular core ranges from conventional cold rolled grain orientated steel (CRGO); to highly permeability steel; to laser scribed grain orientated steel based on customer specifications for no-load losses and noise levels.

Transport restrictions on weight and dimensions determine the most appropriate core type for the transformer that is economical on losses; flux density; overall core weight and sound level.

Winding Design and Manufacturing

The transformer windings must have the ability to withstand high mechanical and electrical stresses resulting from short circuit conditions, lightning and switching surges as well as normal overloads during peak hours in daily operation throughout the lifetime of the transformer. Our windings are made of high strength copper and guarantee high mechanical, electrical and thermal stability under abnormal conditions. This ensures the safe operation of the transformer over its lifetime.

Winding technologies are layer, helical, continuous disk and interleaved disk depending on the operating

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Standard Features of our Power

Transformers

conditions as determined by the rated apparent power; rated voltage; network fault level as well as the climatic conditions of the site of operation and specified temperature rise limits. Disk windings are suitable for higher voltages while layer and helical windings are suitable for lower voltages.

The conductor used on windings is oxygen free copper. The shape of the conductors is rectangular with small edge-radii. The conductor is often divided into two or more parallel conductor elements to reduce the eddy current losses within the winding.

Insulation Material

Material for the insulation structure and barrier boards is manufactured from high quality compressed transformer board, compacted laminated wood and/or fibre sheets depending on the application within the transformer with regard to the electrical and mechanical requirements.

Elevated temperatures (hot-spots) in transformers are detrimental to paper insulation’s longevity due to the decomposition of the cellulose bonding inside the paper at these elevated temperatures. The result is that the insulation between strands is reduced leading to premature insulation failure of the transformer. For paper insulated conductor used on windings, Powertech Transformers has standardised on thermally upgraded paper for all windings types. This ensures an additional 10Kelvin hot spot temperature margin resulting in an extended life of the transformer. Powertech Transformers has a fully equipped paper lapping facility for paper insulating of strip copper as well as an insulation manufacturing facility.

Each strand is insulated either by thermally upgraded paper covering, or by an enamel coating, or both. Two separately insulated and parallel strands may sometimes have a common paper covering. Conductor types can be strip conductor or CTC (Continuously Transposed Conductor).

Manufacturing of windings is carried out by suitably qualified and experienced winders on vertical or horizontal winding machines. Our winding machines are precisely controlled to achieve constant contact pressure and winding tension.

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Standard Features of our Power

Transformers

Insulation Oil

The mineral oil inside the transformer tank acts as an insulation medium as well as a coolant for the windings inside the transformer. The mineral oil used in our transformers complies with international standards. Only virgin oil is used (free of PCB contamination) and no re-generated oil is used to fill the transformers.

Tank Design and Manufacturing

The transformer tank accommodates the core and windings (active part) as well as insulating oil. It serves as a support structure for accessories and control equipment as well as acting as physical protection for the active part. Due to its vital role the tank design must be robust and very reliable implying the use of high quality material.

The transformer tank is usually of the rigid type with removable radiators connected by shut-off valves. The tank shape and size are designed to optimise the quantity of material used taking into consideration the electrical clearance requirements, structural strength and required oil volume. The base is flat with a minimum thickness of 20mm and is determined by the lifting capacity required for the core and winding masses. Mild steel plates are the main building material used in our tank, cover and conservator as well as all the pipes and fittings. However, where there is a serious concern with high currents e.g. around high current carrying bushings and, on areas where there is a threat of rust, stainless steel is used instead. Double welding is used where oil tightness is required. Rubber or cork rubber compound is used for the gaskets on flanged connected pipe joints/transport and inspection cover openings and all other valves and fittings.

Painting and Surface Treatment

Powertech Transformers has a range of proven surface treatments depending on the transformer site climatic conditions and application environment. All paint and coatings are done in accordance with a documented in-house painting system complying with strict safety, health, environmental and quality requirements. All new transformers, irrespective of whether they are operating in non-corrosive or corrosive environments, are coated in accordance with Powertech Transformers corrosive protection specification. Tank external surfaces are painted with a two-component epoxy primer followed by a two component acrylic or polyurethane finishing coat.

In addition to the standard corrosion protection painting system, a zinc-metal spray coating can be applied on customer request. Other customer specific painting system requirements are also provided for. All external surfaces of the transformer and accessories are colour coded in accordance with the Natural Colour System (NCS codes) or RAL international colour standards to a customer’s unique requirements. Separate radiators are generally hot-dip galvanised.

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Standard Features of our Power

Transformers

Main Terminals

Customers have a choice of bushings from standard solid porcelain oil impregnated (OIP) type bushings to resin impregnated (RIP) bushings for various applications such as Oil to Air, Oil to Oil, Oil to SF6, Air to Air and Air to SF6. Our bushings are always sourced from world class suppliers of bushings, who comply with international standards and are generally positioned on the cover.

For voltages above 52 kV, condenser type bushings which facilitate the electric stress control via the insertion of floating aluminium equaliser screens which are located in the condenser core are used. Enclosures can be provided on the primary and/or on the secondary side and may be constructed for cable or bus duct connection. Transformers may also be provided with plug-in or cable box bushings.

Accessories

Depending on the type and application of the transformer the accessories will usually include a combination of the following items either as standard or optional as per customer requirements: • Bushings (Oil or Resin Impregnated, Oil to Air,

Oil to Oil; Oil to SF6)

• Oil conservator with level indicator

• Rubber-bag with bag leak detector in the conservator to prevent oil coming into direct contact with air • Tap changers (oil type as well as vacuum) • Filling and drain valves

• Oil sampling device • Earthing terminals • Lifting lugs • Jacking pads • Radiator panels • Silica-gel breather • Buchholz relay (GOR)

• Winding Temperature Indicators and Oil Temperature Indicators (Analogue or Digital).

• Fibre optic probes for direct hot spot temperature measurements on active part.

• Pressure relief devices and provision for pressure purging systems.

• Provision for water cooled systems • Impact recorders

• Separate core and core clamp earth test positions Additional accessories can be fitted according to customer specifications.

Drying and Vacuum Treatment

The moisture content in oil and solid insulation can have adverse effects on the life span of the transformer since it affects the dielectric breakdown strength of solid and liquid insulation. This affects the rate at which the cellulose ages and the propensity for bubble evolution during overloads. In order to counteract these negative effects of moisture adequate drying and vacuum treatment is performed using proven technology such as Vapour Phase Drying and LFH (Low Frequency Heating). Before filling, the oil is always degassed and purified.

Testing

Every transformer at Powertech Transformers is individually tested according to major international standards as well as, in accordance with any special tests required by the customer, and must pass all these tests before leaving the factory. The test certificate forms part of the transformer operating manual.

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Standard Features of Powertech’s

Power Transformers

SFRA (Swept Frequency Response Analysis) fingerprinting is also done before the transformer leaves the factory and redone on site. Impact recorders are installed on the core as well as on the tank of the transformer to verify adverse impacts or accelerations in all three dimensions. Results of the SFRA test and impact recorder data are made available to our customers.

Standard and Complex Small Power Transformers (SPT)

Powertech Transformers designs and manufactures small power transformers (SPT) ranging from 20 MVA to 63 MVA and up to 172 kV. The SPT range covers standard or complex applications from the typical substations to furnaces, tractions, rectifiers and reactors. Powertech Transformers has the skills and resources to deal with specific customer needs in terms of engineering or assembly requirements, special accessories as well as special materials or components. The following transformers are included in the SPT range:

• Double Wound or Auto-Connected

• Outdoor bushings or cable box applications • 3 phase with/without OLTC

• 2 windings with/without OLTC and with/without stabilising winding.

• ONAN/ONAF/OFAF/ODAF cooling • Standard/High impedance

• Low sound pressure level

S t a n d a r d a n d C o m p l e x M e d i u m P o w e r Transformers (MPT)

Powertech Transformers designs and manufactures medium power transformers (MPT) ranging up to 200 MVA 275 kV. Other power transformer sizes in the MPT range is rated above 200 MVA up to 72 kV. The MPT range covers mostly customer applications such as GSU and system power transformers. Powertech Transformers has the skills and resources to deal with customer needs, however complex these may be in terms of engineering or assembly requirements; special accessories and special materials or components. The following transformers are included in the MPT range:

• 3 phase with/without OLTC/OLTS/Link Board • 2 windings with/without OLTC/OLTS/Link board and with/without (not loaded) stabilising winding • ONAN/ONAF/OFAF/ODAF cooling

• Standard/High impedances • Low sound pressure level

Standard and Complex Large Power Transformers (LPT)

Powertech Transformers designs and manufactures large power transformers (LPT) with a three phase power rating higher than 200 MVA or with voltage ratings higher than 275 kV. Powertech Transformers supplies three phase units up to 800 MVA and single phase units up to 500 MVA. LPT’s are mostly commonly used in customer applications such as generator step-up (GSU), system power transformers and large transmission transformers. The following transformers are included in the LPT range:

• 3 phase with/without OLTC/OLTS/Link Board • 2 windings with/without OLTC/OLTS/Link board and with/without (not loaded) stabilising winding • ONAN/ONAF/OFAF/ODAF cooling

• Standard/High impedances • Low sound pressure level

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Transformers Range Definition

LPT

> 275 kV

SPT 1-2

< 40 MVA 72.5 < kV < 171 Max BIL 650 kV

LPT

> 200 MVA & >72.5 kV MVA 200MVA 63MVA 40MVA 72.5kV 172kV 275kV System Voltage kV For SP 1-5max BIL 650 kV)

MPT

<200 MVA 172 < kV < 275 kV (or BIL >650 kV)

SPT 3-5

40 < MVA < 63 >72.5 - 171 kV Max BIL 650 kV

LDT

< 40 MVA < 72.5 kV

LDT

40 < MVA < 63 < 72.5 kV

MPT

> 63 MVA & < 72.5 kV

MPT

63 < MVA < 200 72.5 < kV < 172

System Highest Nominal System Fault Voltage (kV Voltage (kV Level (kA)

7.2 6.6 25 75 75 - 22 13.2 12 11 25 95 95 - 28 22 17.5 16 20 110 110 - 38 32 24 22 20 150 150 - 50 44 36 36 20 200 200 - 70 66 48 44 20 250 200 - 70 95 72.5 66 20 350 250 - 95 140 100 88 25 380 250 - 95 150 145 132 40 550 250/110 - 95/38 230 245 220 50 850 110 - 38 350 300 275 50 1050 110 850 38 350/260

Lightning Impluse (BIL) -kV peak

Switching Impluse (SIL) -kV peak

Power Frequency Withstand (PF) - kV rms

Line Neutral Phase to Neutral Separate

Source Induced

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Technical Data Sheet (SPT)

132 88 22 5 9 YNa0d1min 9.6 6.8 6.1 6.8 3.0 4.0 41 30 max 10.8 7.1 6.3 8.0 3.3 4.2 43 31 132 66 22 5 10 YNa0d1min 9.2 6.7 5.9 6.4 2.9 3.8 40 27 max 10.2 7.0 6.1 7.4 3.2 4.0 42 28 132 44 22 5 11 YNa0d1min 8.8 6.6 5.8 6.0 2.8 3.7 39 26 max 9.6 6.9 6.0 6.8 3.1 3.9 40 27 132 33 11 YNd1 min 8.5 6.5 5.6 5.7 2.7 3.5 37 26 max 9.2 6.8 5.8 6.4 3.0 3.7 39 28 132 22 11 YNd1 min 8.3 6.5 5.5 5.5 2.7 3.5 36 26 max 9.0 6.8 5.8 6.2 3.0 3.7 37 26 132 11 11 YNd1 min 8.2 6.5 5.4 5.4 2.7 3.4 35 25 22 max 8.7 6.8 5.7 5.9 3.0 3.6 36 27 132 6.6 10 YNd1 min 8.1 6.5 5.5 5.3 2.7 3.4 35 25 22 max 8.6 6.8 5.7 5.8 3.0 3.6 36 27 88 44 22 5 9 YNa0d1min 8.6 6.7 5.7 6.2 2.9 4.0 38 28 max 9.4 7.0 5.9 7.0 3.2 4.2 40 30 88 44 10 YNd1 min 8.6 6.7 5.7 6.2 2.9 4.0 38 28 max 9.4 7.0 5.9 7.0 3.2 4.2 40 30 88 33 11 YNd1 min 7.9 6.5 5.5 5.5 2.7 3.8 34 26 max 8.6 6.8 5.7 6.2 3.0 4.0 36 27 88 22 11 YNd1 min 7.8 6.5 5.3 5.4 2.7 3.6 34 25 max 8.5 6.8 5.5 6.1 3.0 3.8 36 27 88 11 11 YHd1 min 7.7 6.5 5.1 5.3 2.7 3.4 33 25 22 max 8.3 6.8 5.3 5.9 3.0 3.6 36 26 88 6.6 11 YNd1 min 7.6 6.5 5.1 5.2 2.7 3.4 33 25 22 max 8.2 6.8 5.3 5.8 3.0 3.6 35 26 132 88 22 10 9 YNad1 min 10.6 6.8 6.1 7.8 3.0 4.0 50 39 max 11.2 7.1 6.4 8.4 3.3 4.3 53 42 132 66 22 10 10 YNa0d1min 10.3 6.7 6.0 7.5 2.9 3.9 49 39 max 11.0 7.0 6.3 8.2 3.2 4.2 52 41 132 44 22 10 11 YNa0d1min 10.0 6.7 5.9 7.2 2.9 3.8 48 37 max 10.7 7.0 6.2 7.9 3.2 4.1 51 39 132 33 11 YNd1 min 9.7 6.6 5.7 6.9 2.8 3.6 47 35 max 10.5 6.9 6.0 7.7 3.1 3.9 49 37 132 22 11 YNd1 min 9.3 6.5 5.7 6.5 2.7 3.6 47 35 max 10.2 6.8 6.0 7.4 3.0 3.9 49 37 132 11 11 YNd1 min 9.1 6.5 5.5 6.3 2.7 3.5 46 35 22 max 10.1 6.8 6.0 7.3 3.0 3.9 49 36 88 44 22 10 9 YNa0d1min 10.2 6.8 5.7 7.8 3.0 4.0 52 38 max 10.6 7.1 6.0 8.2 3.3 4.3 55 40 88 44 10 YNd1 min 10.2 6.8 5.7 7.8 3.0 4.0 52 38 max 10.6 7.1 6.0 8.2 3.3 4.3 55 40 88 33 11 YNd1 min 8.9 6.6 5.4 6.5 2.8 3.7 46 36 max 9.7 6.9 5.6 7.3 3.1 3.9 49 38 88 22 11 YNd1 min 8.4 6.5 5.3 6.0 2.7 3.6 46 35 max 9.2 6.8 5.5 6.8 3.0 3.8 48 37 88 11 11 YNd1 min 8.1 6.5 5.1 5.7 2.7 3.4 45 35 22 max 9.1 6.8 5.3 6.7 3.0 3.6 48 37 88 6.6 11 YNd1 min 8.0 6.5 5.1 5.6 2.7 3.4 45 34 22 max 8.9 6.8 5.3 6.5 3.0 3.6 47 36 Rating of Imped

MVA tertiary @Nom Vector

Prim Sec Ter (MVA) Tap(%) Group A B C D E F With Oil Without Oil

Nominal Voltage (kV rms) Transformer Mass (Ton) Overall dimensions (m) 20 40 Notes:

• Dimensions and masses in the above table are from typical designs completed in recent years and may vary from these values. Specific values might change based on specific customer requirements.

• Contact Powertech Transformers to verify dimensions for specific applications. • Designs and sizes are not limited to the transformer sizes listed in the table above.

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Technical Data Sheet (MPT)

220 66 22 10 Various YNa0d1min 11.5 7.0 7.1 8.0 3.2 4.2 65 48

max 13.9 7.4 7.6 10.4 3.6 4.7 70 50

275 88 22 10 12.5 YNa0d1min 12.3 7.0 7.8 8.3 3.2 4.2 88 63

max 13.5 7.4 8.3 9.5 3.6 4.7 93 66

220 132 22 10 Various YNa0d1min 11.5 6.9 7.0 8.0 3.1 4.1 78 56

max 12.4 7.3 7.4 8.9 3.5 4.5 82 59

132 88 22 10 Various YNa0d1min 10.6 6.8 6.2 7.8 3.0 4.1 72 48

max 11.2 7.2 6.4 8.4 3.4 4.3 75 54 132 66 22 10 9 to YNa0d1min 10.3 6.7 6.2 7.5 2.9 4.1 68 46 11.7 max 11.1 7.0 6.3 8.3 3.2 4.2 71 48 132 44 22 10 11.3 YNa0d1min 10.0 6.6 6.1 7.2 2.8 4.0 61 43 max 10.7 7.0 6.3 7.9 3.2 4.2 63 45 132 33 11 YNd1 min 9.9 6.6 6.1 7.1 2.8 4.0 59 41 max 10.4 6.9 6.3 7.6 3.1 4.2 61 44

88 44 22 10 Various YNa0d1min 9.5 6.5 5.6 7.1 2.7 3.9 58 41

max 9.9 6.9 5.8 7.5 3.1 4.1 61 43

88 33 11 YNd1 min 9.4 6.5 5.6 7.0 2.7 3.9 53 38

max 9.8 6.8 5.8 7.4 3.0 4.1 56 40

275 132 22 5 11.3 YNa0d1min 12.3 7.7 8.4 8.3 3.9 4.8 108 77

max 12.7 8.2 8.5 8.7 4.4 4.9 114 81

220 132 22 20 Various YNa0d1min 11.5 7.6 7.5 8.0 3.8 4.6 103 74

max 11.9 8.1 7.6 8.4 4.3 4.7 109 78

275 88 22 20 12.5 YNa0d1min 12.3 7.6 8.3 8.3 3.8 4.7 119 76

v 13.1 7.9 8.5 9.1 4.1 4.9 125 81

220 66 22 20 Various YNaod1min 11.7 7.5 7.3 8.2 3.7 4.4 105 74

max 12.4 7.8 7.4 8.9 4.0 4.5 111 78

132 88 22 20 Various YNaod1min 10.8 7.5 6.3 8.0 3.7 4.2 103 71

max 11.3 7.7 6.4 8.5 3.9 4.3 109 75

132 66 22 20 9 to YNa0d1min 10.7 7.4 6.1 7.9 3.6 4.0 95 67

max 11.0 7.7 6.3 8.2 3.9 4.2 100 70

Rating of Imped

Nominal Voltage (kV rms) Transformer Mass (Ton) Overall dimensions (m) 40 80 125 160 Notes:

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Technical Data Sheet (LPT)

Notes:

125 400 132 22 20 14 YNa0d1_maxmin _13.713.2 _7.87.3 8.8_8.9 8.4_8.9 _4.03.5 4.5_4.6 141₁₅₁ 101₁₀₃

400 88 22 20 Various YNa0d1min 13.3 7.5 9.1 8.5 3.7 4.8 181 130

max 13.8 8.1 9.3 9.0 4.3 5.0 195 140

400 132 22 40 14 YNa0d1min 13.6 7.9 9.5 8.8 4.1 5.2 288 140

max 14.8 8.5 9.7 10.0 4.7 5.4 310 149

400 22 Various YNd1 min 13.4 7.7 9.3 8.6 3.9 5.0 279 199

max 14.3 8.3 9.6 9.5 4.5 5.3 300 2.7

400 15 Various YNd1 min 13.0 7.5 9.1 8.2 3.7 4.8 233 166

max 14.2 8.2 9.5 9.4 4.4 5.2 250 180

275 132 22 40 11.3 YNa0d1min 12.1 7.4 8.2 8.1 3.6 4.6 214 148

max 13.0 8.1 8.6 9.0 4.3 5.0 230 155

220 132 22 40 Various YNa0d1min 11.5 7.3 7.5 8.0 3.5 4.6 158 108

max 12.4 8.1 7.8 8.9 4.3 4.9 170 112

400 88 22 40 Various YNd1 min 13.8 7.7 9.3 9.0 3.9 5.0 300 213

max 15.9 8.3 9.4 11.1 4.5 5.1 323 224

275 132 22 40 12.5 YNa0d1min 12.5 7.4 8.4 8.5 3.6 4.8 293 209

max 13.3 8.0 8.6 9.3 4.2 5.0 315 219

132 88 22 40 Various YNd1 min 10.8 7.3 6.8 8.0 3.5 4.7 288 206

max 11.5 7.9 7.1 8.7 4.1 5.0 310 216

400 132 22 40 14 YNa0d1min 13.7 7.7 9.4 8.9 3.9 5.1 293 223

max 14.9 8.1 9.7 10.1 4.3 5.4 316 241

400 22 Various YNd1 min 13.5 7.6 9.3 8.7 3.8 5.0 279 217

max 14.3 8.0 9.5 9.5 4.2 5.2 300 228

400 11 Various YNd1 min 13.4 7.6 9.3 8.6 3.8 5.0 270 204

max 14.3 8.0 9.5 9.5 4.2 5.2 290 214

275 132 22 40 11.3 YNa0d1min 12.5 7.5 8.5 8.5 3.7 4.9 262 200

max 13.3 7.8 8.7 9.3 4.0 5.1 282 209

275 88 22 40 12.5 YNa0d1min 12.5 7.5 8.5 8.5 3.7 4.9 256 195

max 13.2 7.8 8.7 9.2 4.0 5.1 275 205

220 132 22 40 Various YNa0d1min 11.9 7.5 7.8 8.4 3.7 4.9 254 193

max 12.7 7.8 8.0 9.2 4.0 5.1 273 203

400 220 22 20 14 YNa0d1min

max

765 400 33 40 Various YNa0d1min

max

400 275 22 40 12.5 YNa0d1min

max

400 22 Various YNd1 min

max

400 11 Various YNd1 min

max Rating of Imped

Nominal Voltage (kV rms) Transformer Mass (Ton) Overall dimensions (m) 800 630 500 315 250 160

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Transformers Range Definition

Head Office

1 Buitenkant Street, Pretoria West , PO Box 691, Pretoria, 0001, South Africa Tel +27 (0)12 318 9911 Fax +27 (0)86 524 4675

Johannesburg

56 Third Street, Booysens Reserve, Johannesburg, PO Box 38354, Booysens, 2016

Tel +27 11 835 1011 Fax +27 11 835 1717

Cape Town

Elliot Avennue, Epping

PO Box 44, Eppindust, Cape Town, 7475, South Africa Tel +27 (0) 21 534 2681 Fax +27 21 534 5383 Email: [email protected] Web: www.pttransformers.co.za C F D A B E