JSZ Three-Phase Epoxy Resin Cast Voltage Transformer

Ceho provides high-quality JSZ Three-Phase Epoxy Resin Cast Voltage Transformer. The core of this product is based on Faraday's law of electromagnetic induction. When the primary winding is connected to a high-voltage line, the magnetic field generated by the alternating current is coupled to the secondary winding through the iron core, inducing a proportionally reduced voltage signal. Key design features include:

Linear transmission characteristics: High-permeability silicon steel sheets are used for the iron core to ensure a linear relationship between magnetic flux density and voltage, with an error controlled within 0.2%;

Phase consistency: The symmetrical winding layout and epoxy resin curing process together reduce phase angle deviation, meeting the signal synchronization requirements of relay protection;

Insulation synergy: After curing, the cast epoxy resin forms a uniform insulation layer, which both isolates high voltage and assists in heat dissipation, preventing partial discharge.

1. Rated output and its relative accuracy class only one altemative.

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Extended Applications in Industrial and Commercial Sectors

In non-power systems, JSZ Three-Phase Epoxy Resin Cast Voltage Transformer with its pollution-resistant and maintenance-free characteristics, has expanded into the following scenarios:

Heavy Industrial Power Monitoring: Real-time monitoring of voltage fluctuations in high-voltage distribution cabinets in steel mills, chemical plants, etc.;

Commercial Building Power Distribution: Data centers, hospitals, and other locations with high requirements for power supply continuity; the cast-in-place structure avoids the risk of insulating oil leakage;

Rail Transit Power Supply: Adapting to frequent start-stop conditions in subway traction substations; its mechanical strength is superior to porcelain-insulated instrument transformers.

Frequently Asked Questions

1. What are the differences between JSZ three-phase epoxy resin cast voltage transformers and ordinary voltage transformers?

JSZ three-phase epoxy resin cast voltage transformers utilize an epoxy resin vacuum casting process, resulting in significantly superior insulation performance compared to traditional oil-immersed or dry-type voltage transformers. The core differences are threefold: First, the one-piece casting technology eliminates internal air gaps, controlling partial discharge to below 5pC; second, the integrated three-phase structure saves 40% of installation space while avoiding inter-phase electromagnetic interference; third, the hydrophobic nature of epoxy resin makes the product suitable for harsh environments with humidity levels exceeding 95%, whereas ordinary transformers require additional moisture-proof devices.

2. How does epoxy resin casting technology improve the performance of voltage transformers?

Epoxy resin casting achieves performance breakthroughs through three key technologies:

Mechanical Strength: The casting body has a flexural strength of 120MPa, enabling the product to withstand earthquakes of magnitude 7.

Thermal Stability: Glass transition temperature (Tg) ≥110℃, ensuring accuracy deviation <0.2% within the range of -40℃ to +70℃.

Insulation Life: Passes C2/E2 level aging tests, with an expected lifespan more than 15 years longer than oil-immersed transformers.

3. How to determine if a JSZ three-phase epoxy resin cast voltage transformer needs replacement?

Replacement should be considered when any of the following conditions occur:

Dielectric loss factor (tanδ) exceeds 150% of the factory value during routine testing.

Secondary winding DC resistance change rate >±3% (refer to DL/T726 standard).

Outer surface shows cracks or carbonization marks ≥3cm².

Continuous abnormal buzzing sound (>85dB) during operation.