Fully compliant with IEC 60076, ANSI/IEEE C57.12.00, and Sonelgaz medium-voltage grid requirements. Designed for high reliability in ungrounded and resistance-grounded networks.
Voltage: Up to 36 kV Class
Enclosure: Tamper-proof IP55
Application: City Networks & Field Sub-stations
Winding: 100% Electrolytic Copper
Standard: IEC 60076 / CE / 50Hz
Cooling: ONAN / ONAF Self-Cooled
Feature: Built-in Stainless NGR
Vector: Znyn11 / ZN0 Connection
Protection: Zero-Sequence Fault Protection
Core Type: Low Loss Toroidal Grain-Oriented
Efficiency: High Power Density, Low Stray Field
Usage: Control Panels & Audio Signal Isolation
Primary KV: 11kV, 22kV, 30kV, 33kV
Aux Line: Integrated 0.4kV Station Power
Thermal Class: Class A Insulation (Oil)
Precision: Class 0.2S / 0.5 Metering
Function: Residual Voltage Ground Fault Sensing
Medium: Vacuum Epoxy Resin Molded
Safety: Flame-Retardant F1 / E2 / C2
Enclosure: IP31 / IP44 Indoor Substation
Maintenance: Zero Oil Inspection Needed
Rating: 1000 kVA Step-Up/Down
Protection: Hermetically Sealed Oil Tank
Climate Duty: Desert Anti-Sand C5-M Coating
In medium-voltage (MV) electrical distribution networks throughout North Africa—and specifically across Algeria's diverse industrial and municipal grids operated by Sonelgaz (Société Nationale de l'Électricité et du Gaz)—system grounding philosophy is paramount for operational stability, personnel safety, and equipment longevity. A substantial portion of Algeria's 30kV, 10kV, and 60kV distribution infrastructure relies on Delta-connected secondary transformer windings or ungrounded Wye networks. Because these systems lack a inherent neutral point, single-line-to-ground (SLG) faults cannot return to the source naturally, leading to destructive transient overvoltages, arcing grounds, and severe risk of insulation breakdown.
As a premier Grounding Transformer Supplier and Exporter for Algeria, Synergy Transformers provides custom-engineered neutral derivation solutions—including Zigzag (ZN / Znyn11) Grounding Transformers and Wye-Delta (Ynd) Neutral Earthing Units equipped with Neutral Grounding Resistors (NGR). Designed to deliver low zero-sequence impedance during line-to-ground faults while maintaining negligible losses during normal balanced conditions, our transformers guarantee seamless fault identification and protection relay operation for Algerian state utilities, EPC contractors, and heavy industries.
When an ungrounded 30kV system experiences an earth fault in high-ambient Saharan regions (such as Hassi Messaoud or Hassi R'Mel oilfields), the healthy phases experience a voltage rise of $\sqrt{3}$ times nominal line-to-ground potential ($U_0 \rightarrow \sqrt{3}U_0$). Without an engineered zero-sequence return path:
To establish a stable neutral point, two primary magnetic topologies are manufactured at our ISO-certified plant in Rajkot, Gujarat, tailored for export to Algerian ports (Algiers, Oran, Skikda, Bejaia):
Choosing the correct neutral earthing configuration depends on fault current magnitude, fault duration (continuous vs. 10s short-time rated), and auxiliary station power demands. The table below outlines technical metrics engineered for Sonelgaz compatibility:
| Technical Parameter | Standard Zigzag (ZN) Unit | Zigzag with Aux Winding (ZNyn) | Star-Delta Earthing (Ynd) |
|---|---|---|---|
| Primary Voltage Rating | 10 kV, 22 kV, 30 kV (Sonelgaz Standard), 33 kV | 10 kV, 30 kV, 33 kV | 11 kV, 30 kV, 66 kV |
| Zero-Sequence Impedance ($Z_0$) | Ultra-low (Tailored per NGR ohms) | Low to Medium | Medium (Dependent on secondary short-circuit) |
| Fault Current Duration | 10 sec / 30 sec / 60 sec (Short-Time) | 10 sec Short-Time + Continuous LV | Continuous / 10 sec Combined |
| Auxiliary Power Supply | Not Available | Yes (0.4kV 3-Phase 100kVA-630kVA) | Yes (Custom LV Tap) |
| No-Load Loss Profile | Extremely Low (< 0.15% rated kVA) | Low Energy-Efficient CRGO Core | Standard Distribution Loss Profile |
| Protection Relay Interface | Neutral CT + CT in NGR Cabinet | Integrated Neutral CT & LV Protection | Residual Voltage Winding / CT |
Algeria's rapid industrial transformation, backed by national energy expansion projects, requires specialized electrical transformers engineered to endure unique environmental and electrical challenges. Synergy Transformers delivers targeted custom designs for key Algerian sectors:
Deployments in Hassi Messaoud, Rhourde Nouss, and In Salah require oil-immersed grounding transformers with C5-M extreme anti-corrosion painting, sandstorm-sealed IP55 enclosures, and synthetic ester oil options rated for +55°C desert ambient temperatures.
Aligned with Algeria's 4,000 MW Solar Power Masterplan (Biskra, El Oued, Djelfa), our grounding units stabilize inverter-duty step-up transformers, suppressing high-frequency switching harmonics and earth fault transients in large PV arrays.
Replacing legacy ungrounded networks with 30kV Zigzag grounding transformers equipped with 10-second rated 400A Neutral Grounding Resistor cabinets to automate fault location clearing via modern numerical feeder relays.
As an established global manufacturer operating from our state-of-the-art facility in Rajkot, Gujarat (India), Synergy Transformers brings over two decades of technical expertise to overseas EPC contractors and municipal energy authorities in Algeria:
Direct technical answers regarding standards compliance, customs, specification matching, and operational durability in North Africa.
Yes. We specifically engineer 30kV and 10kV grounding transformers (Zigzag and Star-Delta) to meet Algerian electrical grid habits. Our designs match Sonelgaz zero-sequence reactance limits, BIL insulation levels (170kV peak impulse for 30kV systems), and short-time thermal ratings (e.g., 400A for 10s or 30s).
Zero-sequence impedance is calculated based on the maximum allowable ground fault current ($I_f$) and the neutral grounding resistor value ($R_{NGR}$). Our engineering team assists Algerian clients by calculating $Z_0 = \frac{3 \cdot V_{n}}{\sqrt{3} \cdot I_f} - 3 \cdot R_{NGR}$ to ensure precise protection relay coordination and avoid nuisance tripping.
For Saharan locations where ambient temperatures hit +50°C to +55°C, standard +40°C rated transformers will overheat. We design units with lowered temperature rise limits ($45/50^\circ\text{C}$ oil/winding rise instead of $60/65^\circ\text{C}$), UV-resistant C5-M outdoor polyurethane paint, solar radiation shields, and high-flashpoint mineral or synthetic ester oils.
Absolutely. We supply ZNyn11 grounding transformers featuring a continuous-rated secondary Wye winding (e.g., 100kVA to 630kVA at 400V/230V). This provides zero-sequence fault earthing for the 30kV network while simultaneously powering local substation equipment, saving space and capital expenditure.
We routinely supply goods under FOB, CFR, or CIF terms to major Algerian ports (Port of Algiers, Oran, Skikda, Bejaia). Documentation package includes Certificate of Origin, EUR.1 / COO chamber authentication, Commercial Invoice, Packing List, Certificate of Analysis (Oil), and Factory Inspection Test Dossier.
