Oil-Immersed Magnetically Controlled Reactor

Oil-Immersed Magnetically Controlled Reactor is a magnetic saturation type dynamic reactive power compensation device. It adjusts DC excitation current to change core saturation, continuously and steplessly adjusting equivalent reactance and reactive power absorption. It absorbs excess reactive power, suppresses voltage rise, and helps maintain system voltage stability.

The oil-immersed structure provides strong heat dissipation, large single-unit capacity, and low operating noise. It is used in high-voltage and large-capacity power projects.

Working Principle

The main body of oil-immersed magnetic controlled reactor is an iron core with an AC working winding and a DC excitation winding. The control system outputs adjustable DC excitation, changes the core operating point, and controls core permeability.

As excitation current changes, core saturation changes, and the winding equivalent inductance changes continuously. Reactive power absorption capacity is therefore adjusted smoothly from near zero to rated value. This balances grid reactive power and suppresses voltage fluctuation.

Product Structure

Technical Specifications

Features

Continuous stepless reactive power regulation; smooth output, no capacitor switching impact.

Oil insulation and cooling; suitable for high-voltage, large-capacity centralized compensation.

Low operating noise and strong overload capability; designed for long-term continuous operation.

Flexible control: constant voltage, constant reactive power, or constant power factor.

Can operate independently or in parallel with SVG as a hybrid compensation system.

Complete protection: oil level, oil temperature, gas, overcurrent, overvoltage.

Limitations and Site Requirements

Oil-immersed design has oil leakage and fire risk.

Accident oil pit, fire protection, and oil containment are required.

Periodic insulating oil testing and maintenance are necessary.

Site should be free from corrosive gas and conductive dust; outdoor installation requires weather protection.

Typical Applications

Large centralized wind and solar power bases

Thermal and hydropower plants

High-voltage regional substations

Large metallurgical and chemical industrial power systems

High-voltage transmission systems requiring dynamic reactive power compensation

Manufacturing and Quality Assurance

Jiangshan Yulan Transformer Co., Ltd. was established in 1999 and has more than two decades of experience in transformer and reactor manufacturing. The company employs over 75 staff, including 10 engineering and technical personnel: 3 senior engineers, 3 senior technologists, and 4 skilled technicians. It covers 35,000 m², with a 15,000 m² production workshop and fixed assets of RMB 40 million. Annual production capacity reaches 2.6 million kVA, with annual output value of nearly RMB 100 million.

Certifications:

ISO 9001:2015 Quality Management System

ISO 14001:2015 Environmental Management System

ISO 45001:2018 Occupational Health and Safety Management System

Products have been tested by the National Transformer Product Testing Center of China.

FAQ

Q: What is the difference between oil-immersed MCR and dry-type MCR?

A: Oil-immersed MCR uses transformer oil for insulation and cooling. It is suitable for high-voltage and large-capacity applications and generally has lower noise. It requires an accident oil pit, fire protection, and periodic oil testing. Dry-type MCR uses epoxy casting, has no oil, and is preferred for indoor, fire-proof, and explosion-proof locations. Its single-unit capacity and voltage level may be lower.

Q: Can the MCR operate in parallel with SVG?

A: Yes. It can run independently or in parallel with SVG to form a hybrid reactive power compensation system. The MCR handles steady-state reactive power, while the SVG can handle fast fluctuations and harmonic issues.

Q: What site facilities are required?

A: An accident oil pit, fire protection, oil containment, and maintenance access are required. Outdoor installation should include weather protection. The site should avoid corrosive gas and conductive dust.

Q: What maintenance is required?

A: Regular insulating oil tests, oil level and oil temperature checks, inspection of bushings, gas relay, pressure relief valve, and control system. Maintenance intervals depend on operating conditions and project requirements.

Q: What information is needed for a quotation?

A: System voltage, frequency, required reactive power range, control mode, indoor or outdoor installation, communication protocol, altitude, pollution level, noise limit, and whether SVG or capacitor banks are included.

Q: What protection functions are included?

A: Gas relay, pressure relief, oil level, oil temperature, overcurrent, overvoltage, and other protections according to project requirements.

Q: Is 50 Hz and 60 Hz available?

A: Yes. Both 50 Hz and 60 Hz designs are available.

Q: What is the typical lead time?

A: Lead time depends on capacity, configuration, and project schedule. Please contact us with your project details.

Selection and Inquiry

Please provide:

· System rated voltage and frequency

· Required reactive power range (Mvar)

· Control mode: constant voltage, constant reactive power, or constant power factor

· Indoor or outdoor installation; fire protection requirements

· Whether the MCR will operate with SVG or capacitor banks

· Altitude, pollution level, and noise limit

· Communication protocol and dispatch system requirements

For project-specific selection and quotation, please contact our sales team.