Solusyon sa Transformer sa Grounding tipo Z ni VZIMAN: Pag-eliminado sa mga Risgo sa Grid sa mga Ungrounded System
1. Solusyon Background
Sa mga 6kV~36kV distribution networks, ang mga delta-connected transformer windings walay neutral grounding point. VZIMAN® Grounding Transformer nagsilbi niini pinaagi sa pagbuhat og artificial neutral pinaagi sa Z-type winding topology. Kini nga disenyo nagpreventa sa critical risks samtang may single-phase ground faults, kasagaran:
- Overvoltage hazards(>2.5x line voltage sa ungrounded systems)
- Persistent fault currentsnakapasadong moguba sa equipment
- Protection device failuretungod sa insufficent fault current detection
Grounding Transformer nahimog:
- System grounding protection ngadto sa <10Ω zero-sequence impedance
- Overvoltage suppression pinaagi sa low-impedance fault current release
- Neutral voltage measurement (30~70V) para sa full-cable networks
2 . Core Advantages
2.1 Technical Leadership
- Z-Winding Physics (ZNyn Type):
Ang kada phase magbahin sa duha ka reversely wound coils (Zig-Zag configuration), naghunahuna sa zero-sequence flux → No-load losses reduced by 40% conventional transformers.
Zero-sequence impedance <10Ω(vs. >600Ω sa star-delta transformers), nagpadayon sa >90% arc suppression coil utilization.
- Flexible Grounding Transformer Configurations:
Dry-type (AN/AF cooling) o oil-immersed (ONAN/ONAF)
Short-time withstand: 10s@3000A(customizable to 60s)
2.2 Multifunctional Integration
- Dual-Purpose Design:
Nagpalit sa station service transformers pinaagi sa pagdala sa secondary loads samtang nagprotekta sa neutral grounding, nagredukta sa cost sa equipment tungod sa 25%.
- Adaptive Neutral Control:
Nagbuhat og 30–70V measurable voltagesa full-cable networks (low unbalanced voltage).
Balanced 3-phase windings maintain accuracy under **>15% voltage unbalance**.
2.3 High-Reliability Engineering
- Extreme Environment Resilience:
Operational range: -40℃ ~ +40℃| Altitude: ≤1000m (insulation customizable for 4000m)
100% humidity tolerance with IP54+ protection
3. Grounding Transformer Application Scenarios
|
Scenario |
Grounding Transformer Solution |
|
6kV~10kV Distribution |
Provides low-impedance neutral (<10Ω) for delta systems → Direct arc suppression coil connection |
|
35kV+ Systems |
Cooperates with Y-winding transformers to optimize neutral grounding in hybrid grids |
|
Industrial Sites |
Custom windings for high unbalance/full-cable networks → Neutral voltage stabilization (30~70V) |
|
Smart Substations |
Integrated CT/VT + isolation switches → Real-time ground fault analytics |
4. Grounding Transformer Specifications
|
Parameter |
Value |
|
Type |
Zig-Zag (ZNyn) / Dry or oil-immersed |
|
Rated Voltage |
≤36kV |
|
Zero-Seq Impedance |
<10Ω (vs. industry avg. >600Ω) |
|
Cooling Methods |
ONAN (oil)/ONAF (oil+fan)/AN (dry)/AF (dry+fan) |
Note: All Grounding Transformers include IEC 60076-1/6 certification, de-energized tap changers, and HV/LV bushings.
5. Service Commitment
- Onsite Engineering: Certified engineers support installation, commissioning, and arc suppression coil coordination.
- Rapid Response:
Tel: +86(577) 27869969 (Barry) | Email: support@vziman.com
- Lifecycle Management: IEC-compliant maintenance + fault diagnostics for Grounding Transformer
