Design | Manufacturing | Installation | Service

www.centrado.co.id

Distribution & Power Transformers

www.centrado.co.id

Design | Manufacturing | Installation | Service | 2

IntroductionCENTRADO is a transformer manufacturer, which established since 1976.CENTRADO has developed year to year and until now the product scope are :

Distribution TransformerGenerator TransformerFurnace TransformerDual Voltage Transformer

Medium Voltage Transformer

Low Voltage Transformer

- 25 KVA up to 10.000 KVA ( 3 KV UP TO 24 KV )

Auto Transformer

Isolation Transformer

- 100 VA up to 1000 KVA (400/231 V ; 380/220 V ; 220/127 V ; 200/115 V )- Special order as inquiry

Rectifier Transformer- 50 Amp up to 10.000 Amp

Starting Transformer- 3 HP up to 1500 HP

K - Factor Transformer

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Coil Winding MachineGuillotine Shear MachineHydraulic Bending MachinePower Press MachineHydraulic Press Brake MachineDrilling & Tapping MachineWelding TransformerVacuum Oil PurifierTest Oil MachineFull Automatic Chain HoistHydraulic Press Radiator Double

Action Machine, dsb.

For product processing, our factory completed with high quality and sophisticated production machines, such as :

www.centrado.co.id

Design | Manufacturing | Installation | Service3 |

3

ConstructionA. TransformerCore

B.Coils

C. Terminal

D. Tank

E. TransfomerPacking

Transformer cores made from Grain OrientedSilicon Steel M4 0,27 mm designed to guaranteethe mechanic power, reduce vibration and noises with low iron losses.

Coil made by high constructivity copper, coil onhigh voltage side made by enamel isolated copperwire, and on low voltage side made by paperisolated wire.Note : If there is any special inquiry for higher

isolation class, basic commodity will beprovided.

* Cores and coils will then dry out with oven until is2000 Mega Ohm.

High voltage terminal using isolator porcelain orelastimold Synthetic Resin. Low voltage terminalusing isolation porcelain with current above 1000Awith syntehtic resin isolated copper.

Made by zinc plated steel ( Electrogalvanized ZinCoated Steel ) or Mild Steel Plate. Constructiondesigned with waterproff and airtight.

Transformer packing made by rubber that can holdhigh temperature and also has a good oil resistant.

CENTRADO transformer can handle dielectric test to high voltage 50Hz/60Hz and impulsevoltage according to IEC Standard and Indonesia Standard (SPLN & SLI).

Compatibility with voltage distribution system in Indonesia, i.e : 6 KV, 12 KV, 20KV and 24 KV.Primary voltage tapping had been done with comutator (Tap-Changer) with empty load onprimary side. CENTRADO also serving special inquiry for other high voltage transformeraccording to costumer needs.

Tapping system is moved to appropriate +4%, +2,5% atau 5%. For transformer with capacityabove 100 KVA can be made with 2 primary voltage comutator switch / construction voltagemovement outside the tank makes usage with double function easier, can be locked for safety.

Secondary voltage side on empty load can be made 133 V/231 V (B1) and 231 V / 400 V (B2)or can be together with condition : on 133 V / 231 V only 75% and on 231 V / 400 V, so thepower is : 100% from it’s normal power.

PrimaryVoltage

SecondaryVoltage

www.centrado.co.id

Design | Manufacturing | Installation | Service | 4

Generally for 25 KVAuntil160 KVA, vector group that used is : YZN-11, YZN-5.And for above 200 KVA, vektor group that used is : DYN-5 atau DYN-11.

Vector group

Transformer equipment included on each transformer :RollerOil drain/sampling valveEarthing terminalThermometer pocketOil Level IndicatorRadiatorName plate and spesification diagram

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Transformer Equipment

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Buholz Relay or DGPT-2Dial thermometer with Alarm Contact & TrippingElastimoldCable BoxPressure Relief Valve or DevicePressure Vacuum Gauge

Additional Equipment

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Ratio TestInsulation TestIron Loses TestCopper Loses TestImpedance TestResistance Winding MachineDielectric Test 60 KVOver Voltage Test 350Hz

Transformer Testing

F. Painting

G. OILBefore painting process, has to vanish the oil and rust on steel sheet surface. Continue withlast painting then heated on some temperature to gets a perfect result.

Minyak trafo mempunyai fungsi ganda yaitu sebagai isolasi dan pendingin.Sesuai standar PLN, olie trafo yang digunakan adalah : SHELLDIALA B “ atau sejenisnya.

www.centrado.co.id

Design | Manufacturing | Installation | Service5 |

Quality ControlQuality control on Transformer, our factory equipped with test equpment as folllows :

Digital Low Resistance Ohm MeterTransformer Turn Ratio 3 Phase.Voltmeter, Amp Meter, Watt MeterCurrent TransformerPotential TransformerInduction Voltage RegulatorInsulation TesterOil Tester + RecorderHigh Voltage Test SetM - G Set (Induction Voltage Testing Device)

To increasing our service to costumer, we also give other service such as :Commissioning transformerElectrical installationRepair transformerPurifying oil transformerFor every transformer sales, CENTRADO gives 12 Month Warranty.Delivered transformer always followed by documents, ie :Certificate Test TransformerCertificate Warranty TransformerManual /Maintenance Book

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