Single Phase 7.2KV 11KV 33KV Indoor Voltage Transformer For Power Systems

The JDZX-10 (including JDZX-3, 6, and 10 variants) is a single-phase, indoor voltage transformer (PT) designed for power systems with a rated frequency of 50Hz or 60Hz. It is primarily used for voltage measurement, energy metering, and relay protection in medium-voltage switchgear.

Featuring a fully enclosed, vacuum-cast epoxy resin structure, the JDZX-10 provides superior insulation and moisture resistance. Its "X" designation indicates a residual voltage winding (earth-leakage protection), making it an essential component for monitoring phase-to-ground voltages and detecting neutral point displacement in ungrounded or resonant-grounded networks.

• High-Precision Core & Windings: Utilizing premium-grade silicon steel and 99.9% oxygen-free copper, the JDZX-10 offers exceptional accuracy classes (Class 0.2, 0.5, or 3P), ensuring reliable revenue-grade billing and sensitive protection.

• Superior Insulation Performance: The vacuum-casting process eliminates air bubbles within the epoxy, resulting in extremely low Partial Discharge (PD) levels. This prevents internal tracking and ensures a service life of over 20 years.

• Residual Voltage Winding: Equipped with a dedicated secondary winding for earth-fault protection (Residual Voltage), allowing for the connection of ground-fault relays and monitoring devices.

• Thermal & Mechanical Resilience: The rugged epoxy exterior protects the internal components from mechanical shock, vibration, and chemical pollution common in industrial substations.

• Compact Footprint: Engineered to fit seamlessly into standard 10kV–12kV indoor switchgear (such as KYN28A-12), saving valuable space in compact electrical rooms.

1. Industrial Substations: Providing accurate voltage signals for energy management and power quality monitoring.

2. Grid Protection: Detecting phase-to-ground faults in 11kV/12kV networks to trigger protective relays.

3. Revenue Metering: Serving as the high-accuracy interface for billing-grade electricity meters.

4. Renewable Energy Plants: Integration into wind and solar step-up transformers for grid-tie synchronization.

• Rigorous Testing Protocol: Every JDZX-10 unit undergoes power-frequency withstand, polarity, and accuracy testing. We provide full test reports to satisfy utility audit requirements.

• Custom Voltage Ratios: We specialize in non-standard primary/secondary voltage combinations (e.g., 6.6kV, 11kV, or 33kV) tailored to specific regional grid standards.

• Corrosion-Resistant Terminals: Primary and secondary terminals are treated for high conductivity and oxidation resistance, ensuring stable connections even in humid environments.

• Global Logistics Support: Available for bulk export with reinforced packaging to ensure the delicate epoxy bushings arrive intact and ready for installation.

Q: What is the difference between JDZ-10 and JDZX-10?

A: The "X" in JDZX-10 indicates that the transformer has a residual voltage winding (tertiary winding). This is used specifically for ground-fault protection, whereas the standard JDZ model is primarily for phase-to-phase measurement.

Q: Can this PT handle 60Hz systems?

A: Yes. Our JDZX-10 is designed with a universal core that performs reliably at both 50Hz and 60Hz frequencies.

Q: How do I calculate the correct VA rating?

A: You should total the burden of all connected devices (meters, relays, etc.). It is recommended to choose a VA rating where your total load is between 25% and 100% of the rated output to maintain accuracy.