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

• 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.

• Key Parameters Configuration

• 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

• 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.

• 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.

• 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

• 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.