35kv dry type transformer
1.Safe and reliable: oil-free, epoxy cast, fire and explosion proof, can be installed indoors and in load centers.
2.Moderate loss: Type 9 energy efficiency design, stable operation, high cost performance.
3.Strong short-circuit resistance: good insulation, high mechanical strength, suitable for 35kV power grid working conditions.
4.Weather and moisture resistance: dust-proof, moisture-proof, anti-pollution, strong environmental adaptability.
5.Simple maintenance: equipped with intelligent temperature control, oil-free maintenance, long service life.
35kV SCB9 Epoxy Resin Cast Dry-Type Transformer – Product Introduction
I. Product Definition & Standards
In the designation SCB9:
S: Three-phase
C: Cast resin insulation
B: Foil winding
9: Design series (Type 9 low-loss performance)
35kV: Rated high voltage
This transformer complies with GB/T 10228 and IEC 60076.
It features Class F insulation (155℃), fully sealed vacuum epoxy casting, oil-free, flame-retardant and explosion-proof structure. It is an ideal replacement for traditional oil-immersed transformers in noise‑sensitive, fire‑critical and environmentally sensitive locations.
II. Key Technical Parameters(Customizable)
| Item | Standard Specification |
Rated Voltage | HV: 35kV, off‑circuit tap adjustment ±2×2.5% LV: 0.4kV |
Rated Capacity | Standard: 30kVA–2500kVA; Optional up to 3150kVA from some manufacturers |
Connection Group | Dyn11 (default, meets phase and grounding requirements) |
Cooling Mode | AN (Natural Air Cooling) / AF (Forced Air Cooling) 120% continuous overload for AN; up to 150% for AF |
Insulation Class | Class F (155℃), temperature rise meets national standards |
Protection Degree | IP20 (standard); IP30 / IP40 optional |
Frequency | 50Hz (standard); 60Hz customizable for export |
III. Structural Design Features
Core:
High-quality cold-rolled high-permeability silicon steel, fully mitered joints, secured with non‑magnetic binding straps, epoxy coating on surface.
Effectively reduces no-load loss, no-load current and operating noise.
Windings:
HV windings made of copper conductors; LV windings adopt copper foil structure.
Vacuum epoxy casting with fiberglass reinforcement, extremely low partial discharge, high mechanical strength, excellent short‑circuit withstand capability, no cracking during long‑term operation.
Temperature Control & Monitoring:
Standard intelligent temperature controller with PT100 sensors, over‑temperature alarm and trip.
Optional RS485 port for integration into SCADA system for remote monitoring.Automatic fan control.
Tank & Protection:
Cold-rolled steel enclosure with selectable protection degree.
Protective grilles and rain covers available for indoor or simple outdoor installation.
![35kv dry type transformer]( "35kv dry type transformer")
IV. Core Performance Advantages
Safe & Eco‑friendly
Oil‑free, leak‑proof, flame‑retardant, explosion‑proof, no oil pollution.
Can be installed directly in load centers (hospitals, airports, high‑rises, residential areas, chemical zones) without oil pits or fire separation zones.
Low Loss & Energy Saving
Complies with Type 9 loss standards. Optimized core and winding design reduce both no‑load and load loss, significantly lowering long‑term electricity cost.
Energy efficiency exceeds older dry‑type and oil‑immersed transformers.
Weather & Pollution Resistant
Fully sealed structure: moisture‑proof, dust‑proof, anti‑condensation, pollution‑tolerant.
Stable operation in high humidity, coastal, heavily polluted areas.No pre‑drying required before restart after long shutdown.
Low Noise & Stable Operation
Low‑noise silicon steel and structural noise reduction; noise level generally below national limits.
High mechanical strength withstands grid impact and short‑circuit current.
Maintenance‑free & Long Service Life
No oil maintenance needed. Epoxy structure is highly anti‑aging.
Service life: 20–30 years under normal working conditions.
V. Typical Applications
Power grid: 35kV distribution substations, urban/rural grid renovation, industrial & mining step‑down stations
Key buildings: shopping malls, subways, airports, hospitals, data centers
Harsh environments: high‑humidity coastal areas, chemical zones, flammable & explosive sites (mines, refineries)
Noise‑sensitive & eco‑sensitive areas: residential communities, schools
VI. Installation & Operation Guidelines
Installation:
Level foundation, good ventilation; avoid sealed spaces without ventilation.
Tighten terminals properly; ensure correct tap changer position.
Routine Maintenance:
Regularly clean enclosure and fan filters.
Check temperature controller, alarms and protection functions.No oil change or refilling required; only periodic inspection of electrical connections and insulation.
Testing:
Pre-commissioning tests: insulation resistance, transformation ratio, vector group, DC resistance, withstand voltage.
Periodic preventive tests recommended (e.g. every 5 years).
VII. Selection & Customization Suggestions
Capacity:
Select at 70%–80% load rate, with 10%–20% margin for future load growth.
Cooling:
Natural cooling (AN) for small indoor units; forced cooling (AF) recommended for large capacity or hot climates.
Protection Degree:
IP30 or higher for outdoor or dusty environments.
Optional Functions:
On‑load voltage regulation, enclosure heaters, dehumidifiers, remote monitoring modules.
