Arab Tower · Distribution Transformers

Oil-Immersed Distribution Transformers

Oil-immersed distribution transformers from 50 to 2500 kVA, 11kV/433V to IEC 60076 — CRGO core, copper windings, supplied, installed and commissioned by Arab Tower across the UAE and internationally.

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Rating Range

50–2500 kVA

Primary

11 kV

Standard

IEC 60076

Technical Specification

Key Features & Capabilities

✓ CRGO silicon steel core
✓ Copper windings throughout
✓ Hermetically sealed tank / conservator
✓ Nitrogen blanketing (hermetically sealed units)
✓ Off-circuit tap changer (±2 × 2.5%)
✓ Oil level gauge (magnetic type)
✓ Thermometer pocket
✓ Pressure relief device
✓ Oil drain & filter valve
✓ Lifting lugs (4 nos)
✓ Earthing terminals (2 nos)
✓ Buchholz relay (≥400 kVA)
✓ Anti-corrosion treatment & RAL 7033 finish
✓ Silica gel breather

Standard Ratings — 11kV / 433V, 3-Phase, 50Hz, D

kVA	Z (%)	HV (A)	LV (A)	NLL (W)	FLL (W)	Eff FL	Eff 75%	dB(A)	Oil (L)
50	4.0	2.6	66.6	145	870	97.5%	97.9%	≤42	50
100	4.0	5.2	133	250	1,580	97.8%	98.1%	≤42	80
160	4.0	8.4	213	350	2,350	97.9%	98.3%	≤46	105
200	4.0	10.5	267	420	2,850	98.0%	98.3%	≤46	120
250	4.0	13.1	333	490	3,400	98.1%	98.4%	≤46	140
315	4.0	16.5	420	580	4,100	98.2%	98.5%	≤55	165
400	4.0	21.0	533	680	4,900	98.3%	98.6%	≤55	200
500	4.0	26.2	667	800	5,900	98.4%	98.6%	≤55	310
630	4.0	33.0	840	950	7,200	98.4%	98.7%	≤60	370
800	4.5	42.0	1,066	1,100	8,800	98.5%	98.8%	≤60	430
1000	4.5	52.5	1,333	1,300	10,500	98.5%	98.8%	≤60	510
1250	5.0	65.6	1,667	1,550	12,500	98.6%	98.9%	≤65	600
1500	5.0	78.7	2,000	1,800	14,500	98.7%	98.9%	≤65	690
2000	5.5	105.0	2,667	2,200	18,500	98.7%	99.0%	≤70	850
2500	6.0	131.2	3,333	2,600	22,000	98.8%	99.0%	≤70	1000

Electrical Specifications

Primary Voltage	11,000V (±2 × 2.5% taps)
Secondary Voltage	433/250V
Vector Group	Dyn11
Frequency	50 Hz
Insulation System	Kraft Paper / Mineral Oil (Class A)
Temp Rise (Oil / Winding)	60°C / 65°C max
Impedance	4.0 – 6.0% (by rating)
Cooling	ONAN std / ONAF optional
HV BIL / LV BIL	75 kV / 20 kV
Max Ambient Temp	50°C
Short Circuit Level	16–40 kA (1 sec, per rating)

Construction & Design

Standard	IEC 60076
Core	CRGO Silicon Steel
Windings	Copper Throughout
Tank	Hermetically Sealed ≤315 kVA
└	Conservator ≥400 kVA
Cooling System	Corrugated Fins / Radiator Panels
Paint Finish	RAL 7033 Grey (Anti-Corrosion)
Tap Changer	±2 × 2.5% Off-Circuit
HV Bushings	12 kV Outdoor Porcelain (3 nos)
LV Bushings	1.1 kV Porcelain (4 nos, 3Ph+N)
Altitude	Up to 1000m ASL

Standards & Compliance

CEIEC 60076ISO 9001DEWA ✓SEWA ✓Etihad Water & Electricity ✓ADDC ✓BS EN 60076

Frequently asked questions

What transformer ratings does ATEC supply?

Oil-immersed distribution transformers from 50 to 2,500 kVA — including the common 500, 1000, 1500 and 2000 kVA ratings — plus custom sizes on request. Supplied, installed, tested and commissioned across the UAE.

Oil-immersed or dry-type — which should I choose?

We supply both. The right choice depends on the project specification — load, location, installation conditions and the consultant's requirements. Our engineers review your specification and recommend the right type.

Do you handle testing and utility coordination?

Yes — routine test certificates, site testing and coordination with the utility through energization.

Supply only, or turnkey?

Both — supply-only with full documentation, or complete turnkey delivery, installation, testing and commissioning.