Reactor Insulation Materials | DMD NMN NHN Insulation Paper

Insulation Materials Used in Reactors In reactors, insulation materials are mainly used for winding insulation, stru...

Insulation Materials Used in Reactors

In reactors, insulation materials are mainly used for winding insulation, structural insulation, and overall protection, and must meet strict requirements for thermal resistance, dielectric strength, vibration resistance, and long-term aging stability.

1. Common Insulation Materials Used in Reactors

Insulation Paper / Composite Insulation Materials (Core Materials)
Used for: inter-layer insulation, turn-to-turn insulation, and insulation between windings and the core

DMD (Polyester Film Composite Insulation Paper)
Thermal class: B / F (130°C / 155°C)
Features: High mechanical strength, good cost performance
Applications: Dry-type reactors, VFD reactors

NMN / NHN (Aramid Composite Insulation Paper)
Thermal class: H (180°C)
Features: Excellent high-temperature resistance and long service life
Applications: New energy reactors, high-power and high-temperature-rise reactors

Insulating Kraft Paper

Thermal class: A (105°C)
Applications: Low-end or low-temperature-rise reactors (gradually being phased out)

Enameled Wire Insulation

Used for: reactor winding conductors
Polyester enameled wire (155°C)
Polyester-imide / Polyimide enameled wire (180°C / 200°C)
Features: High thermal endurance and corona resistance, forming the basic insulation of the winding.

Impregnation Insulation Materials

Used for: overall solidification, insulation enhancement, and heat dissipation
Insulating varnish (VPI / DIP)
Epoxy resin (for dry-type reactors)
Functions:
✔ Improves dielectric strength
✔ Reduces vibration and noise
✔ Enhances moisture and dust resistance

Structural Insulation Materials

Used for: supporting, isolating, and fixing components
Insulating sleeves (fiberglass tubes, heat-shrink tubes)
G10 / G11 fiberglass laminates
Insulating spacers and supports

2. Recommended Insulation Systems for Different Applications

Application	Recommended Insulation System
Industrial reactors	DMD + polyester enameled wire
VFD reactors	F-class DMD or NMN
PV / Energy storage reactors	NMN / NHN + H-class wire
High reliability applications	Full H-class insulation system

3. Why Insulation Material Selection Is Critical

Reactors operate under continuous thermal stress
Harmonics increase the risk of partial discharge
Insulation aging directly determines service life
Each increase in thermal class can theoretically double the service life of the reactor.

4.Selection of Insulation Material Manufacturer

XUJUE ELECTRICAL is a professional manufacturer specializing in electrical insulation materials for reactors, transformers, motors, and new energy applications.

With advanced production equipment, strict quality control systems, and extensive industry experience, XUJUE ELECTRICALprovides a complete range of insulation solutions, including DMD, NMN, and NHN insulation paper, fiberglass laminates, and customized insulation components. All products are engineered to perform reliably under high-temperature, high-voltage, and high-harmonic operating conditions.

XUJUE ELECTRICAL offers custom thicknesses, precision slitting, and insulation component processing to meet diverse application requirements. Our products are widely used in VFD reactors, photovoltaic systems, energy storage systems, and industrial power equipment, and are supplied to customers worldwide.

Choosing XUJUE ELECTRICAL means choosing stable quality, reliable supply, and professional insulation solutions for reactor applications.