Featured Industrial & Earthing Transformer Range
Explore our custom OEM transformer configurations engineered for high efficiency, extreme desert ambient withstand, and rigorous fault protection across Saudi Arabian industrial networks.
Aluminium Body Small Wind Turbine for Farm Grounding Systems
10MVA–20MVA 33KV/69KV Power Transformer Copper Winding Dyn11 (60Hz KSA)
Wind Turbine Isolation Transformer 800KVA Three Phase IP65 CE Certified
5KVA/10KVA Single Phase Control Transformer (Pure Copper Winding ISO)
Fire Prevention 33KV/35KV Three Phase Isolation Dry Type Transformer
Distribution Transformer 100kVA 13.8kV/0.4kV Oil Immersed Copper Winding
Heavy Industrial High-Voltage Grid Earthing & Power Unit (5-25MVA 66KV)
S11 3-Phase Oil Immersed Grounding & Distribution Transformer 100% Copper
Understanding Industrial Earthing Transformer Engineering for KSA Power Systems
In delta-connected ($Δ$) ungrounded power distribution networks—common across Saudi Arabian industrial complexes, petrochemical plants, and 13.8kV / 33kV substations—a physical neutral point does not naturally exist. When line-to-ground faults occur, ungrounded systems experience dangerous transient overvoltages, arching grounds, and phase-to-ground voltage escalation up to $\sqrt{3}$ times the nominal voltage.
Zigzag (Zn) Vector Winding Configuration
The Zigzag (or interconnected star) winding configuration is the most effective topological design for deriving an artificial neutral point. Each limb of the transformer core houses two equal windings wound in opposite directions.
- High zero-sequence impedance under normal steady-state conditions (minimal magnetizing current).
- Low zero-sequence impedance ($Z_0$) under single line-to-ground fault conditions, enabling controlled fault current flow.
- Eliminates phase displacement while trapping 3rd, 9th, and 15th harmonic currents within the local loop.
Star-Open Delta (YNd) Grounding System
For applications where auxiliary power integration or external secondary tripping logic is required, a Star Primary with Open-Delta Secondary ($YNd$) configuration is utilized.
- Primary star connection connected directly to the high-voltage delta bus with grounded neutral.
- Open-delta secondary provides secondary voltage measurement for directional earth fault relays.
- Allows seamless connection of Neutral Grounding Resistors (NGR) or reactors to clamp maximum fault currents.
Integrated Auxiliary Power Secondary Winding
Custom OEM Earthing Transformers engineered by Urja Techniques feature an optional low-voltage continuous auxiliary winding (e.g., 400V/230V, 50kVA–500kVA rating).
- Dual-purpose functionality: Artificial neutral creation + Substation local auxiliary power supply.
- Significantly reduces substation footprint and capital expenditure by eliminating separate auxiliary transformers.
- Designed with electrostatic shields between primary and secondary windings to suppress switching surges.
Deploying Earthing Transformers Across KSA Industrial Ecosystems
Saudi Arabia’s aggressive expansion under Vision 2030 requires electrical equipment capable of enduring extreme desert environments, heavy inductive loads, and strict compliance with SEC (Saudi Electricity Company) and Saudi Aramco standards.
1. NEOM & Red Sea Solar Renewable Energy Plants
In massive utility-scale Solar PV developments across the Western Region (Tabuk, Al-Jouf, NEOM), floating neutral conditions occur when central inverters feed delta-wound step-up transformers (33kV). Our custom OEM Earthing Transformers provide a stable zero-sequence ground reference point.
2. SABIC Petrochemical & Industrial Refining Complexes
Industrial refining cities such as Jubail and Yanbu present high ambient temperatures up to 55°C, high humidity, and atmospheric corrosive elements (C5-M rating). Our hermetically sealed oil-immersed earthing transformers feature corrugation or radiator cooling tanks treated with multi-layer epoxy powder coating.
3. SEC 13.8kV & 33kV Substation Distribution Networks
The Saudi Electricity Company requires strict short-time fault withstand ratings (typically 10-second or 30-second thermal current duration, such as 100A to 3000A fault current). Urja Techniques manufactures custom OEM units fully compliant with SEC PTS (Project Technical Specifications) 13-SD-02.
4. Wa’ad Al Shamal Mining & Heavy Metallurgical Facilities
Heavy phosphate and mineral processing facilities operate massive induction furnaces and heavy motorized equipment. Severe dust storms (Haboob) and dust ingress are mitigated through our VPI (Vacuum Pressure Impregnated) dry-type earthing transformers housed in sand-proof IP55 enclosures with sand trap louvers.
Pioneering High-Efficiency Power Solutions for the GCC Region
As Saudi Arabia accelerates its national grid modernization, technical performance requirements for grounding devices have escalated. Urja Techniques combines 30+ years of engineering mastery with stringent international quality verification.
Technical Superiority & Rigorous Quality Assurance
Every single custom OEM Earthing Transformer manufactured at our Mumbai facility for export to Saudi Arabia undergoes strict routine testing in accordance with IEC 60076 and IS 2026. Furthermore, our designs have been type-tested at world-renowned independent laboratories including CPRI (Central Power Research Institute) and ERDA.
CPRI & ERDA Type Test Verified
Validated for short-circuit withstand performance, lightning impulse breakdown voltage, acoustic sound levels, and temperature rise test at high ambient conditions.
ISO 9001:2015 / ISO 14001:2015 Certified
Fully certified quality system ensuring total traceability of prime-grade magnetic steel cores, electrolytic copper, and ester/mineral insulation fluids.
Saudi Aramco & SEC Engineering Compliance
Engineered precisely to fulfill SAMSS-P-114, SAMSS-P-121, and SEC distribution standards including custom bushing layout and neutral resistor integration.
Export-Ready Logistics to KSA Ports
Seamless seaworthy vacuum foil packaging and export delivery directly to Dammam (King Abdulaziz Port), Jeddah Islamic Port, or Jubail Commercial Port.
Frequently Asked Questions by KSA Electrical Engineers & Buyers
Get immediate technical clarity regarding design selection, ambient thermal derating, vector groups, and compliance for Saudi industrial projects.
Q1 Why is a Zigzag (Zn) earthing transformer preferred over a Star-Delta (YNd) transformer for 33kV delta grids in Saudi Arabia?
A Zigzag (Zn) earthing transformer is significantly more compact and cost-effective than a standard Star-Delta transformer of equal zero-sequence current capacity. Because the Zigzag winding features two opposing winding halves on each core leg, it offers an exceptionally high magnetizing impedance under normal operating conditions (resulting in near-zero no-load losses), while presenting a very low zero-sequence impedance during ground faults. Furthermore, it avoids the requirement of a secondary closed-delta winding unless local auxiliary power is needed.
Q2 How does Urja Techniques address Saudi Arabia's extreme ambient summer temperatures (up to 55°C)?
Standard IEC/IEEE transformers are designed for a peak ambient temperature of 40°C. For shipments to Saudi Arabia, Urja Techniques redesigns the electromagnetic core and copper coils with thermal derating factors, utilizing lower current density in copper conductors, expanded cooling radiator surface areas, and high thermal class insulation materials (Class F or Class H for dry-type; high-fire-point synthetic ester or mineral oil with modified top-oil temperature rise limits for oil-immersed units).
Q3 What parameters are required to specify an OEM Industrial Earthing Transformer order for KSA delivery?
To provide an accurate design quotation, electrical engineers should specify: (1) System Voltage (e.g., 11kV, 13.8kV, 33kV, 34.5kV, 60Hz), (2) Rated Zero-Sequence Neutral Current $I_n$ (e.g., 100A, 400A, 1000A, 3000A), (3) Short-Time Fault Duration (typically 10 seconds or 30 seconds), (4) Vector Group (Zn0, Zny11, YNd11), (5) Auxiliary Winding Capacity if required (e.g., 100kVA, 400V/230V), and (6) Enclosure Protection Rating (IP55/IP65 for outdoor desert locations).
Q4 Can an earthing transformer be combined with a Neutral Grounding Resistor (NGR)?
Yes. In fact, combining a custom OEM Zigzag Earthing Transformer with a Neutral Grounding Resistor (NGR) is the industry standard for medium-voltage industrial plants in KSA. The earthing transformer derives the neutral point, and the NGR connected between the transformer neutral terminal and earth limits the maximum earth-fault current to a safe predetermined value (e.g., 100A to 400A), preventing damage to switchgear, cables, and motors.
Q5 Are your transformers manufactured in compliance with Saudi Electricity Company (SEC) standards?
Absolutely. Our custom OEM Earthing Transformers comply with SEC Project Technical Specifications (PTS), Saudi Arabian Standards Organization (SASO), as well as international IEC 60076-6, IS 2026, and IEEE C57.12.00 standards. Complete factory acceptance test (FAT) documentation, including core loss, winding resistance, insulation resistance, and ratio tests, is provided with every export dispatch.
Q6 What is the typical lead time for custom OEM earthing transformers shipped to Saudi Arabia?
Manufacturing lead time generally ranges from 4 to 8 weeks depending on capacity rating and specification complexity. Shipping from our Mumbai port facility to Saudi ports (Jeddah, Dammam, Jubail) typically takes only 8 to 14 days in transit, ensuring fast delivery for critical project schedules.
Global Expertise, Precision Engineering & Export Excellence
Established in 1991 in Mumbai, India, Urja Techniques (India) Pvt. Ltd. has developed into a premier global manufacturer and exporter of energy-efficient power, distribution, furnace, and specialized earthing transformers.
30+ Years Industry Heritage
Over three decades of specialized engineering experience in design, manufacturing, and technical support for electrical utilities, major EPC contractors, and multinational corporations worldwide.
State-of-the-Art In-House Testing Facility
Equipped with an advanced in-built temperature rise test system, high-voltage impulse test equipment, digital turn ratio meters, and power analyzer systems for total quality control before shipment.
Robust Global Export Footprint
Over 40% of our annual production revenue is generated from international markets across the Middle East, Africa, Europe, and Asia, proving our mastery over international shipping logistics and site requirements.