Electrical Insulation Semiconductor Crepe Paper (often referred to as semiconductor corrugated paper) is a key material for balancing electric fields, suppressing partial discharge, and preventing insulation breakdown in high-voltage electrical equipment (transformers, transformers, cables). Its core function is the combination of electric field buffering, charge dissipation, and insulation protection.
1、 Core role (one sentence summary)
By utilizing weak conductivity (semiconductor properties), the peak electric field at the end of the high-voltage winding/conductor is flattened, eliminating local strong electric fields, suppressing partial discharges, extending insulation life, and preventing breakdown.
2、 Five key functions
1. Balanced electric field distribution (core)
High voltage windings, leads, corners, and ends have highly concentrated electric fields (up to 3-5 times the average electric field), which can easily cause discharge.
After being wrapped in semiconductor wrinkled paper (with a volume resistivity of 10 ⁵~10 ⁷ Ω· cm), reverse charges are induced to form a buffer layer, which weakens the tip electric field by more than 60%.
Make the electric field transition smoothly from sudden changes to avoid insulation breakdown caused by excessive local field strength.
2. Inhibit partial discharge (anti-aging, anti breakdown)
Partial discharge is the main cause of insulation aging, electrical branching, and breakdown.
Semiconductor paper can dissipate accumulated charges and eliminate air gap electric field distortion, which can reduce partial discharge by 70% to 80%.
Significantly increase the starting voltage of partial discharge, making the equipment more stable under high voltage.
3. Charge dissipation and anti-static measures
The weak conductivity allows the induced static charge to slowly flow towards the ground, without accumulation, flashover, or static discharge.
Avoid electric field distortion, surface flashover, and insulation degradation caused by charge accumulation.
4. Dual protection of machinery and insulation (taking into account the function of ordinary corrugated paper)
Elastic fit: The wrinkle structure is soft and stretchable, tightly covering the coil, lead, edges, and filling the air gap.
Insulation+buffering: It has the electrical strength, heat resistance (E-grade 120 ℃), oil resistance of insulating paper, as well as buffering vibration, wear resistance, and displacement resistance.
Oil immersion adaptation: The transformer oil has sufficient oil absorption, no expansion, no layering, and is compatible with the oil paper insulation system.
5. Replace metal shielding and simplify the process
Traditional metal foil/semiconductor tape shielding is prone to warping, scratching, poor contact, and the generation of floating potential.
Semiconductor wrinkled paper has good flexibility, tight adhesion, no gaps, uniform resistivity, simpler process, higher reliability, and lower cost.
3、 Working principle (simple explanation)
Ordinary insulating paper: only insulating, non-conductive → charge accumulates more and more at the tip, electric field becomes stronger → discharge, breakdown.
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