What are the uses of Electrical Insulation Semiconductor Crepe Paper

       Electrical Insulation Semiconductor Crepe Paper, modified with carbon black conductivity on the substrate of electrical corrugated paper, has controllable weak conductivity (semiconductor properties), while retaining the characteristics of stretchability, resistance to transformer oil, and good flexibility of corrugated paper; The core function is to evenly distribute voltage, alleviate electric fields, suppress partial discharge, and prevent corona. It is mainly used for internal insulation shielding of high-voltage transmission and transformation equipment, which is different from ordinary insulation corrugated paper.

1. Oil immersed power transformer (maximum application scenario)

       End shielding of windings: The high and low voltage windings are wound at the front and rear ends and sharp corners to alleviate the concentration of electric fields at the ends, suppress partial discharge and corona, and are standard materials for large main transformers of 110kV and above.

       Lead voltage equalization wrapping: Wrap the body leads, bare copper bars, and connection parts of the tap changer to balance the potential and prevent creeping along the surface.

       Winding angle and oil passage edge reinforcement: in the area of electric field stress concentration, it also serves as a dual function of buffering pad and electric field relaxation.

       Insulation of iron core clamps eliminates the floating potential of metal components and avoids the risk of stray discharge.

       Adaptation: Oil immersed main transformer, rectifier transformer, electric furnace transformer.

2. Current and Voltage Transformers (CT/PT)

       Wrap the ends of primary and secondary windings, outgoing terminals, and winding corners; Improving the distorted electric field at the end, reducing local discharge, and significantly enhancing the reliability of transformer operation, it is widely used in high-voltage transformers in power grids.

3. High voltage reactors and capacitors

       Oil immersed/dry-type reactor: shielding of winding ends and incoming and outgoing lines to offset insulation hazards caused by vibration and temperature changes.

       High voltage power capacitors: Core leads and corner voltage protection between poles to reduce the probability of partial discharge faults.

4. High voltage cables and cable accessories

       Used as a stress control layer material inside high-voltage cable terminals and intermediate joints; Covering the insulation fracture and exposed position of the conductor, smoothing the sudden change of electric field, is a key shielding material for cable accessories.

5. High voltage switchgear and conduit products

       Oil immersed circuit breakers and load switches: internal conductors and contact base corners are wrapped to eliminate metal sharp corner electric field concentration.

       The busbar of the switchgear, the root of the wall bushing, and the edge of the insulation parts are subjected to voltage equalization treatment to improve the insulation reliability inside the cabinet.

6. Other special high-voltage electrical equipment

       End shielding of dry-type transformer winding;

       Special high-voltage testing equipment, internal electric field buffering of pulse transformers;

       In oil immersed insulation equipment, it can be combined with ordinary insulation corrugated paper for composite use.

Material matching advantages

       Controllable semiconductor resistivity, uniform discharge of charges, smooth distorted electric field, and suppression of partial discharge;

       Wrinkle structure is stretchable, fits conductors and irregular corners, and has good winding processability;

       Resistant to transformer oil, with good compatibility with mineral oil and synthetic ester insulation oil, and stable performance in oil immersed environments;

       Good mechanical toughness, easy to break during assembly and winding.

       Differentiation: Ordinary insulation wrinkle paper is pure insulation; Semiconductor corrugated paper is a semi conductive pressure shielding material and cannot be used as a regular insulation isolation material.