31.5MVA‑132/11.5kV Mobile Substation Solution for Iraq’s Petroleum Industry

Writer： Hengfeng you electric Time：2026-09-17 views：times

Ⅰ. Requirements for the 31.5MVA‑132/11.5kV Mobile Substation for Iraq’s Petroleum Industry

Petroleum production sites are widely distributed across northern Iraq. North Oil Company (NOC) oversees hydrocarbon exploration, production and facility operation in key northern regions including Kirkuk and Mosul. Its field assets cover oilfields, pumping stations, processing plants and associated production facilities, which impose stringent requirements on power supply continuity and operational flexibility.

This project addresses on‑site power demands of Iraq’s petroleum sector. The client requires a complete 31.5MVA‑132/11.5kV mobile substation to step‑down 132 kV high‑voltage power to 11.5 kV medium‑voltage power for downstream production loads. Different from a standalone main transformer supply scope, the client expects a full mobile substation system capable of high‑voltage incoming connection, voltage transformation, medium‑voltage distribution, relay protection and operational control.

Site‑specific conditions define clear technical requirements. The system shall ensure reliable 132 kV high‑voltage connection and protection. The 31.5 MVA main transformer shall satisfy medium‑voltage load capacity, while 11.5 kV medium‑voltage switchgear distributes power across multiple outgoing feeders. Protection‑control units, metering devices, DC power supply and auxiliary power systems shall be equipped to enable autonomous operation and real‑time monitoring.

As a mobile substation, the design cannot follow fixed‑type substation standards alone. Integration performance, transport feasibility, fast on‑site commissioning and subsequent relocation are critical considerations. Therefore, the client pursues an all‑in‑one power solution combining transformation equipment, medium‑voltage distribution, protection & control, auxiliary systems and mobile transportation structure, rather than purchasing separate transformers.

In response to above‑mentioned requirements, Hengfengyou Electric configures the 31.5MVA‑132/11.5kV mobile substation. By integrating high‑voltage system, main transformer, 11.5 kV medium‑voltage switchgear, protection‑control and auxiliary units, it provides a complete mobile power conversion and distribution solution for Iraq’s petroleum sites.

Ⅱ. Overall Solution of the 31.5MVA‑132/11.5kV Mobile Substation for Iraq’s Petroleum Industry

Centered on the 31.5 MVA main transformer, this mobile substation is engineered for 132 kV high‑voltage incoming and 11.5 kV medium‑voltage power distribution.

The 132 kV side is fitted with high‑voltage circuit breakers, disconnectors, earthing switches, current transformers, voltage transformers and surge arrest voltage transformers and surge arresters to realize circuit breaking, isolation, metering and over‑voltage protection. After voltage transformation by the main transformer, electric power flows into the 11.5 kV medium‑voltage system and is delivered to industrial loads via medium‑voltage switchgear.

Relay protection, monitoring, metering, DC power supply and low‑voltage auxiliary systems are fully incorporated. Apart from power transformation and distribution functions, the mobile substation fulfills industrial‑site needs for operational supervision and safety control.

This integrated design reduces fragmented configuration of discrete electrical equipment and builds a coordinated system covering power supply, protection and control.

Ⅲ. Configuration of 132 kV High‑Voltage System and 31.5 MVA Main Transformer

1. 132 kV High‑Voltage Equipment

The mobile substation adopts 132 kV incoming connection. Outdoor high‑voltage circuit breakers, disconnectors and earthing switches are supplied, together with current transformers, voltage transformers and surge arresters for line connection, measurement, protection and safety isolation.

High‑voltage equipment is mechanically matched with the mobile substation frame. While complying with 132 kV system specifications, the design takes transportation, field assembly and wiring conditions into account to guarantee stable high‑voltage power input for the main transformer.

2. 31.5 MVA Main Transformer

As the core component, the 31.5 MVA main transformer converts 132 kV high‑voltage power to 11.5 kV medium‑voltage power. An oil‑immersed unit with OFAF cooling is selected to meet heat dissipation requirements under full‑capacity 31.5 MVA operation.

Equipped with an On‑Load Tap Changer (OLTC), the transformer adjusts output voltage dynamically according to operational conditions, accommodating load fluctuations and voltage‑regulation demands at petroleum sites. Integrated with 132 kV high‑voltage apparatus, 11.5 kV medium‑voltage switchgear and protection‑control system, it enables seamless power flow from high‑voltage incoming to medium‑voltage distribution.

Key Parameters of 31.5 MVA Main Transformer

Technical parameters of main transformers can be customized to match voltage levels, capacity and operating environments for different countries and industrial projects. For technical proposals or quotations of 31.5 MVA and other transformer ratings, please contact Hengfengyou Electric via hfy@hengfengyou.com. Our engineering team provides product selection and technical support tailored to project requirements.

Ⅳ. 11.5 kV Medium‑Voltage Distribution and Switchgear Solution

After voltage transformation, the 11.5 kV medium‑voltage system undertakes power distribution and acts as the critical link between the main transformer and downstream industrial loads.

Metal‑clad medium‑voltage switchgear is deployed with incoming and outgoing feeders configured according to power‑supply demands. The incoming bay receives power output from the main transformer, while outgoing bays supply power to production units and other consumer zones.

Featuring reliable mechanical and electrical isolation performance, medium‑voltage switchgear cooperates with relay protection systems to detect faults and isolate faulty circuits. For continuous‑process scenarios such as oil production, properly segmented outgoing feeders grant individual loads independent power supply and protection, simplifying on‑site maintenance.

A metering unit is integrated to monitor medium‑voltage operational parameters and generate basic data for energy management and performance analysis.

Ⅴ. Protection, Control and Auxiliary Systems for Iraq‑Based Petroleum‑Industry Mobile Substation

A complete mobile substation requires not only primary electrical equipment but also well‑developed secondary control and auxiliary systems to secure stable operation.

1. Relay Protection and Monitoring

Protection units monitor operating status of transformers, high‑voltage and medium‑voltage circuits, and trigger protective actions upon faults such as short‑circuit and over‑current.

Supervision and control systems collect key operational parameters and manage equipment status. Co‑operation among protection, measurement and control modules enhances substation‑operation manageability.

2. On‑Load Tap Changing and Voltage Control

Fitted with an on‑load tap changer, the main transformer regulates output voltage responding to system variations. For industrial sites with volatile load profiles, optimized voltage control maintains medium‑voltage system within proper operating ranges.

3. DC Power Supply and Low‑Voltage Auxiliary System

110 V storage battery and charging units are installed to deliver stable DC power for vital secondary devices including protection and control apparatuses.

Auxiliary transformer and low‑voltage AC distribution system supply power for substation lighting, control circuits and other auxiliary loads, forming a self‑contained in‑station auxiliary power network.

Ⅵ. Integrated Design of the 31.5MVA‑132/11.5kV Mobile Substation

Compared with conventional fixed substations, mobile substations stand out for system integration, transportability and rapid deployment.

The 31.5 MVA main transformer and high‑voltage equipment are built into transport‑ready mobile structures. Medium‑voltage switchgear, low‑voltage and control assemblies are centrally arranged inside electrical houses. Modular design minimizes on‑site assembly work and improves interoperability among different units.

Mechanical design fully considers equipment weight, transport dimensions, road constraints and on‑site lifting conditions. Apart from electrical performance, mechanical feasibility and transport requirements are prioritized in the design phase.

This design delivers superior deployment flexibility for industrial projects with phased‑power‑supply requirements or shifting load locations.

Ⅶ. Application Value of 31.5MVA‑132/11.5kV Mobile Substation in Iraq’s Petroleum Industry

The 31.5MVA‑132/11.5kV mobile substation targets industrial scenarios calling for high power‑supply reliability and flexible deployment.

Within oil‑gas projects, it powers production facilities, hydrocarbon‑processing zones and associated industrial loads. For mining and heavy‑industry projects, it performs temporary power supply, capacity expansion and phased power guarantee as production zones evolve.

Where existing substation capacity cannot accommodate new‑added loads, the mobile substation serves as an independent power‑supply unit for system expansion. For locations constrained for fixed‑substation construction, its mobile architecture enables flexible equipment deployment.

Its value extends beyond voltage transformation. The core advantage lies in comprehensive power‑supply capability achieved through full integration of transformers, switchgears, protection‑control hardware and auxiliary systems.

Ⅷ. 31.5MVA‑132/11.5kV Mobile Substation Solution from Hengfengyou Electric

Hengfengyou Electric supplies transformers, switchgears and complete power‑transmission‑and‑distribution equipment for overseas power and industrial projects. Customized solutions are developed according to project voltage classes, capacity, load characteristics and site conditions.

For the 31.5MVA‑132/11.5kV mobile substation project, the overall solution covers high‑voltage incoming, transformer‑based voltage conversion, medium‑voltage distribution, relay protection, monitoring‑control and auxiliary power supply. Transport and on‑site deployment are factored into mobile‑structure design.

Through systematic integration of primary equipment and control systems, Hengfengyou Electric provides flexible mobile‑substation solutions for oil‑gas, mining, manufacturing and other large‑scale energy projects.

For overseas clients requiring power‑configuration adjustment, capacity upgrading or temporary power systems at challenging sites, the 31.5MVA‑132/11.5kV mobile substation offers end‑to‑end power conversion and distribution from high‑voltage incoming to medium‑voltage output. Hengfengyou Electric develops tailor‑made mobile‑substation solutions adapted to country‑specific standards, voltage ratings, capacity and field conditions. To obtain technical datasheets, configuration suggestions or project quotations, please contact our technical team via hfy@hengfengyou.com for further discussion of your project requirements.