Air-core Reactor

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Product Overview

Air-core Reactor

High-voltage rated voltage	6kV / 10kV / 35kV / 66kV / 110kV; customizable
Low-voltage rated voltage	Not applicable
Rated capacity	50kvar ~ 120Mvar
Power Supply Mode	Series / shunt / filter / neutral earthing / motor starting reactor
Frequency	50Hz; 60Hz customizable for overseas projects
Cooling Type	AN air natural cooling, dry type

Air-Core Reactor Technical Specifications

Parameter	Value	Parameter	Value
High-voltage rated voltage	6kV / 10kV / 35kV / 66kV / 110kV; customizable	Low-voltage rated voltage	Not applicable
Rated capacity	50kvar ~ 120Mvar	Power Supply Mode	Series / shunt / filter / neutral earthing / motor starting reactor
Frequency	50Hz; 60Hz customizable for overseas projects	Cooling Type	AN air natural cooling, dry type
Product Type	Dry-type air-core reactor	Reactance Rate	Series reactor: 0.1% ~ 18%; shunt reactor customized on request
Insulation Level	Compliant with IEC 60076-6 and GB/T 1094.6	Installation	Indoor / outdoor; vertical stacking or horizontal layout
Ambient Conditions	-40°C ~ +40°C; high altitude, coastal salt spray and extreme cold versions available	Insulation Medium	Epoxy glass fibre dry encapsulation; oil-free
Inductance Characteristic	No iron core saturation; high inductance linearity; stable inductance under harmonic conditions	Partial Discharge	<= 10pC at 1.1 x rated voltage
Noise Level	Typical 62dB(A) at 1m; low-noise version available	Short-Circuit Withstand	Designed and validated per IEC 60076-5 with dynamic force margin > 1.3 x calculated values
Thermal Performance	Temperature rise complies with IEC/GB standards; sufficient thermal margin under harmonic load	Design Life	>= 30 years under normal indoor / outdoor operating conditions
Conductor Material	Multi-strand parallel oxygen-free aluminium; copper optional	Conductor Insulation	Film insulation on individual strands with conductor transposition
Encapsulation System	Glass fibre + epoxy resin vacuum impregnated encapsulation; integral curing	Insulation Structure	Multi-layer encapsulation with turn-to-turn and layer insulation redundancy
Support Insulators	High-strength epoxy insulators; hydrophobic and anti-pollution	Anti-Corrosion Grade	C3, C4, C5, CX-H
Standard Accessories	Support insulators, earth terminals, corona shields and rain hoods	Temperature Monitoring	Fibre-optic temperature online monitoring optional
Design Method	Electromagnetic-thermal-flow-structural multi-physics coupled design	Electromagnetic Simulation	3D FEM; inductance linearity; harmonic loss; turn-to-turn electric field; external magnetic field
Mechanical Simulation	ANSYS structural simulation; short-circuit electrodynamic force; encapsulation and support strength	Thermal-Flow Simulation	CFD natural convection simulation; steady-state and harmonic temperature rise prediction
Insulation Coordination	Turn-to-turn and layer insulation electric field simulation; lightning and switching impulse verification	Seismic Qualification	IEEE 693 compliance available as an option
Typical Model	35kV, 12000kvar, 6% dry-type air-core series reactor	Reference Cooling	AN air natural cooling
Reference Installation	Outdoor substation installation	Reference Anti-Corrosion	C3, C4, C5, CX-H
Applicable Standards	IEC 60076-6; GB/T 1094.6; GB/T 25076	Export Standards	IEEE C57.16 optional; IEEE 693 optional; RoHS and REACH
Quality System	ISO 9001; ISO 14001; ISO 45001	Material Traceability	Key materials compliant with IEC/GB requirements with full traceability
Typical Applications	PV/wind power collection substations; power grid substations; rail transit; industrial VFD; arc furnace systems	Application Functions	Reactive power compensation; harmonic filtering; current limiting; neutral earthing; series resonance
Factory Acceptance Testing	Inductance measurement; resistance; loss; partial discharge; dielectric withstand tests	Third-Party Testing	Short-circuit testing by professional authorized third-party laboratories
Site Support	Installation guidance; lifting supervision; pre-commissioning inspection; commissioning support	Warranty	Comprehensive product warranty; extended service agreement optional
Spare Parts Supply	Minimum 25-year spare-parts supply for key components	Technical Training	On-site or remote O&M training covering magnetic field, heating and maintenance
Customization	Series / shunt / filter / neutral earthing reactors; adjustable reactance rate	Environmental Options	High altitude; coastal salt spray; extreme cold; low-noise versions
ESG Documentation	LCA life-cycle assessment documentation available upon request	Technical Documentation	Simulation reports; type-test reports; material certificates; material traceability documents

Protection & Accessories

Reliable Protection System and Flexible Accessories

Our Pad Mounted Transformers are equipped with reliable protection devices and accessories to ensure safe operation in underground distribution systems and utility applications.

Standard Accessories

HV/LV Bushings

Reliable medium voltage connection with excellent insulation performance.

Oil Level Gauge

Easy monitoring of insulating oil level for maintenance.

Pressure Relief Device

Improves transformer safety under abnormal conditions.

Drain Valve

Convenient oil draining and maintenance operation.

Tap Changer

Off-circuit Tap Changer (OCTC), ±2 × 2.5%

Nameplate

Provides complete transformer rating and technical information.

Optional Accessories

Temperature Indicator

Monitors transformer operating temperature for reliability.

Remote Monitoring System

Supports smart grid and remote transformer condition monitoring.

Surge Arrester

Protects pad mounted transformers against lightning and voltage surges.

Key Features of Transformers

Key Benefits:

Enhanced operator and public safety
No exposed high-voltage components
Suitable for underground distribution systems
Reliable operation in outdoor environments

Key Benefits:

Weather-resistant construction
Corrosion-resistant surface treatment
Secure locking compartment
Suitable for public and utility applications

Key Benefits:

Space-saving installation
Low-profile outdoor design
Easy inspection and maintenance
Ideal alternative to overhead distribution systems

Available Configurations:

Loop feed distribution system
Radial feed distribution system
Dead-front cable connection
Customized MV and LV connection arrangements

Available protection and accessories include:

High voltage fuses
Current limiting fuses
Load break switches
Surge arresters
Pressure relief devices
Temperature monitoring systems

These protection solutions help ensure safe operation under different load and fault conditions.

Key Benefits:

Low no-load losses
High energy efficiency
Excellent thermal performance
Long operational lifetime

Manufacturing & Testing

Strict Quality Control and Transformer Testing

Every Pad Mounted Transformer undergoes comprehensive testing to ensure high reliability, safety and long service life according to international standards.

Routine Tests

Transformer Ratio Test

Ensures accurate voltage transformation performance.

Winding Resistance Test

Verifies winding quality and electrical performance.

No-Load Loss Test

Checks transformer core efficiency and energy performance.

No-Load Loss Test

Confirms transformer rated efficiency under operating conditions.

Impedance Test

Ensures correct electrical characteristics and system compatibility.

Dielectric Test

Verifies insulation strength and operational safety.

Special Tests

Temperature Rise Test

Validates thermal performance and cooling capability.

Lightning Impulse Test

Tests insulation capability against surge conditions.

Partial Discharge Test

Ensures insulation quality and long-term reliability.

Everything We Do Is At A High Standard

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WHAT WE DO

CTSS Transformer Applications and Solutions

We design and manufacture liquid-filled power transformers and distribution transformers for a wide range of applications, including solar power, data centers, industrial facilities, and utility systems. With experienced engineers and advanced manufacturing capabilities, we provide customized transformer solutions and complex winding designs to meet the specific electrical and performance requirements of each project.