JDZ 12Q Double Pole Insulation Design Enhanced Electrical Safety

The JDZ-12Q and JDZJ-12Q Semi-enclosed Voltage Transformers are engineered with a double-pole insulation design, a critical feature that significantly enhances electrical safety in 12kV indoor switchgear applications. This design, realized through high-quality epoxy resin casting, creates two independent insulation barriers between the primary winding and the grounded core, providing a fail-safe dielectric structure that exceeds standard single-insulation requirements .

This dual insulation architecture is particularly valuable in medium-voltage switchgear where insulation failure can have catastrophic consequences. The epoxy resin used in the casting process possesses exceptional dielectric strength, track resistance, and moisture repellency, ensuring consistent insulation performance even in high-humidity indoor environments . The double-pole construction effectively eliminates single-point-of-failure risks that plague conventional designs.

Beyond the safety factor, the double-pole insulation contributes to the transformers' long-term reliability. The epoxy encapsulation permanently protects the internal windings and core from environmental contaminants such as dust, conductive particles, and corrosive gases. This protection is essential for maintaining measurement accuracy and protection integrity over the transformers' decades-long service life, as specified in IEC 61869-3 standards .

The insulation design is validated through comprehensive type testing per IEC 61869-1/3. The JDZ-12Q series withstands a rated power frequency withstand voltage of 28kV and a lightning impulse withstand voltage of 75kV, confirming its dielectric margin for robust system protection . The transformers also meet the 12/28/75kV insulation level specification, ensuring compatibility with standard 12kV switchgear insulation coordination.

Therefore, for switchgear manufacturers and utilities prioritizing operator safety and long-term reliability, the double-pole insulated JDZ-12Q series provides a proven, fail-safe voltage sensing solution. Putai also supports customization and the supply of related medium-voltage accessories to meet system integration needs.
(Article content references network resources.)