Solusyon ng VZIMAN Z-type Grounding Transformer: Pag-aliw ng mga Panganib sa Grid sa mga Hindi Naka-ground na Sistema
1. Paliwanag ng Solusyon
Sa mga network ng distribusyon na 6kV~36kV, ang mga delta-connected transformer windings ay walang punto ng neutral grounding. Ang VZIMAN® Grounding Transformer ay nagbibigay ng isang artipisyal na neutral sa pamamagitan ng Z-type winding topology. Ang disenyo na ito ay nagbabawas ng mahahalagang mga panganib sa panahon ng single-phase ground fault, kabilang ang:
- Mga panganib ng overvoltage(>2.5x line voltage sa mga ungrounded systems)
- Persistent fault currentsna nagsasanhi ng pagkasira ng mga equipment
- Kasamaan ng protection devicedahil sa hindi sapat na pag-detect ng fault current
Grounding Transformer nagbibigay ng:
- Proteksyon ng sistema sa grounding na may <10Ω zero-sequence impedance
- Supresyon ng overvoltage sa pamamagitan ng low-impedance fault current release
- Pag-measure ng neutral voltage (30~70V) para sa full-cable networks
2. Pangunahing mga Bentahe
2.1 Teknikal na Leadership
- Z-Winding Physics (ZNyn Type):
Ang bawat phase ay nahahati sa dalawang reversely wound coils (Zig-Zag configuration), na nagcacancel ng zero-sequence flux → No-load losses reduced by 40% kumpara sa conventional transformers.
Zero-sequence impedance <10Ω(vs. >600Ω sa star-delta transformers), na nagpapahintulot ng >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:
Nagpapalit ng station service transformers sa pamamagitan ng pag-carry ng secondary loads habang nagbibigay ng neutral grounding, na nagbabawas ng 25% sa cost ng equipment.
- Adaptive Neutral Control:
Nag-generate ng 30–70V measurable voltagesa full-cable networks (low unbalanced voltage).
Balanced 3-phase windings na nagpapanatili ng 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. Mga Scenario ng Application ng Grounding Transformer
|
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. Mga Specification ng Grounding Transformer
|
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. Pagnanais ng Serbisyo
- 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
