ROCKWILL H59 Grounding Transformer Solution: Zig-Zag Winding & Smart Monitoring for Neutral Grounding Systems

ROCKWILL H59 Grounding Transformer Solution: Zig-Zag Winding & Smart Monitoring for Neutral Grounding Systems​

Application Scenarios:
Neutral point grounding in ungrounded or resonant grounded systems, limiting single-phase ground fault current, suppressing system overvoltage.

​I. Core Design Solutions​

1. ​Customized Grounding Transformer​
• Built on the ​H59 oil-immersed transformer platform, with high-voltage side using ​Zig-Zag windings​ or ​Yn-d connection​ to provide stable neutral grounding impedance.
• Complies with ​IEC 60076​ and ​NF C52-112 standards, with insulation strength designed to withstand ground fault current surges.
2. ​Key Parameters Configuration​

1. ​Grounding Method Selection​
• ​Resistance Grounding: Secondary side connected to ​stainless steel grid resistor cabinets, limiting fault current to a safe range (Optional: 200A–2000A).
• ​Arc Suppression Coil Grounding: Paired with automatic tuning arc suppression coils to extinguish fault-point arcs.

​II. Technical Advantages​

1. ​Reliable Structure & Protection​
• ​Fully sealed oil tank: ​IP23 protection rating, suitable for outdoor installation (–25℃ to +50℃).
• ​Epoxy resin bushings: High-voltage side uses ​33kV-grade T-type cable terminations (EPDM material)​, ensuring insulation reliability in humid environments.
2. ​Intelligent Monitoring System​
• Integrated ​DGPT2/DMCR protection relays​ for real-time monitoring of:
  ✓ Neutral point current/voltage
  ✓ Oil temperature (55℃ max. temperature rise)
  ✓ Oil level & pressure transients
  ✓ Fault gases (H₂, CH₄) content.
3. ​High Efficiency & Energy Saving​
• ​Copper windings + ONAN cooling: No-load loss ≤0.2% of rated capacity (e.g., 1300W for 630kVA).
• ​Efficiency >98.5%​​ (at full load, cosφ=1), meeting green grid standards.

​III. Engineering Adaptation Services​

1. ​Customized Configuration​
• Bushings creepage distance customized for altitude (>1000m requires reinforced insulation) and pollution levels.
• Optional add-ons:
• ​5-position non-excitation tap changer (±2×2.5%)​​
• ​Stainless oil valves & anti-vibration roller bases​.

​IV. Typical Case Parameters​

​V. Service Commitment​

• ​10-year warranty: Lifelong maintenance for seals and windings.
• ​48-hour response: Technical support hotline ​​+86 577 27869969.
• ​Documentation provided: Grounding calculation reports, type test certificates (including temperature rise & short-circuit tests).

​Note: This solution requires user-provided parameters (e.g., system short-circuit capacity, capacitive current) for precision engineering. Rockwill engineers will customize designs accordingly.