36KV Dry Type Power Transformer

For many years, as a large transformer exporter and manufacturer in China, Cotenele has provided reliable and stable 36KV Dry Type Power Transformer to customers in countries and regions such as Africa, Europe, and the Middle East, and has received unanimous praise from customers. The Cotenele 36kV series dry-type power transformers have the characteristics of low loss, low noise, lightning protection, high short-circuit tolerance, and beautiful appearance. The product has advanced assembly and manufacturing processes, reliable and excellent accessory quality. It has four remote functions: remote communication, remote testing, remote adjustment, and remote control. Through computer remote control, remote monitoring of the power station can be achieved without the need for on-site office duty. All the Cotenele 36KV series dry-type power transformers comply with international and national standards such as GB/T 1094.1-2013, GB/T 1094.11-2007, GB/T 10228-2015, IEC60076-1:2011, IEC60076-11:2018 etc.

Service conditions of 36KV Dry-Type Power transformers

Main technical parameters

SC(B)10 series 36kV dry-type transformer technical parameters (35/0.4kV)

SC(B)10 series 36kV dry-type transformer technical parameters (35/10kV)

SC(B)11 series 36kV dry-type transformer technical parameters

Internal Structure for 36kV series dry-type power transformers

A 35kV dry-type transformer mainly consists of the following components:

1. Core

Made of high-quality, high-permeability grain-oriented cold-rolled silicon steel sheets, assembled in a 45° full-miter stepped lap arrangement. The core surface is encapsulated with epoxy resin to reduce stray flux, improve magnetic circuit distribution, and lower core noise, no-load loss, and no-load current.

2. High-Voltage Winding

The high-voltage winding adopts a sectionalised layered or multi-layer cylindrical structure to significantly reduce the inter-layer voltage. It is vacuum-cast with filled epoxy resin to minimise partial discharges and improve electrical performance. DMD epoxy prepreg is used between layers, and glass-fibre mesh cloth is applied on the surface to enhance mechanical strength and short-circuit withstand capability.

3. Low-Voltage Winding

The low-voltage winding uses a foil-wound structure with axial cooling ducts to improve heat dissipation. The ends are encapsulated with epoxy resin and fully cured to form a solid assembly.

4. Insulation System

Epoxy resin or other resin compounds are used as the main insulation. The windings are cast under vacuum, and after curing they form a robust monolithic structure.

5. Cooling and Temperature Monitoring

Equipped with cooling devices (natural air cooling or forced air cooling) and temperature sensors, and can be fitted with a comprehensive temperature detection and protection system.

6. Other Components

High-voltage bushing outlets, lifting lugs, upper and lower clamping frames, low-voltage terminals, nameplate, tapping connectors, etc.

Product Features of 36kV series dry-type power transformers

1. Fire-safe and flame-retardant: Epoxy resin is inherently non-combustible and does not support fire; no explosion risk.

2. Environmentally friendly: No oil is used, so there is no oil-contamination hazard.

3. High mechanical strength: The resin-cast windings are robust and offer strong short-circuit withstand capability.

4. Excellent electrical performance: Low partial discharge levels and high impulse withstand levels (lightning and switching).

5. Low losses and low noise: High-quality silicon steel and advanced core stacking reduce no-load losses and audible noise.

6. Good overload capability: Class F or H insulation provides high thermal endurance and allows significant overload operation.

7. Moisture-and dust-resistant: The winding surface is coated with anti-corrosion varnish, ensuring stable performance in dusty or humid environments.

8. Easy maintenance: No oil handling; after long-term shutdown, only a simple drying treatment is needed. Essentially maintenance-free.

9. Compact and lightweight: Small footprint and lower installation costs.

10. Intelligent temperature control: Optional smart temperature monitoring system that automatically detects and displays winding temperatures, starts/stops cooling fans, and provides alarm and trip signals.

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FAQs (Frequently Asked Questions)

Q1: What is the maximum capacity available for your 36kV series dry-type transformers?

A: According to the national standard GB/T 10228, the conventional capacity range of 36kV dry-type transformers is 30-2500 kVA. However, the latest version of GB/T 10228 has extended this range to 25000 kVA. Larger capacity can also be customized based on specific user needs.

Q2: Can your 36kV series dry-type transformers be installed outdoors?

A: Yes, outdoor versions are available. However, the appropriate degree of protection must be selected. Typically, IP00 is enclosure-less (indoor use), IP20 protects against solid objects larger than 12 mm, and IP23 offers protection against rain and snow. For outdoor installation, IP23 or higher with an additional protective housing is recommended.

Q3: How are your 36kV series dry-type transformers cooled, and how much can forced-air cooling increase their output?

A: The cooling methods can be divided into natural air cooling (AN) and forced air cooling (AF). Under natural air cooling conditions, the transformer can operate continuously at its rated capacity. Forced air cooling can increase the output capacity by up to 50% and is suitable for intermittent overload operation.

Q4: How are energy efficiency levels classified for Cotenele 36kV series dry-type transformers?

A: According to the national standard GB 20052-2024 "Minimum Allowable Values and Energy Efficiency Grades for Power Transformers", our 36kV series dry-type transformers are divided into three energy efficiency grades: Grade I, Grade II, and Grade III. Grade I is the highest level with the lowest loss. Choosing a higher energy efficiency level can significantly reduce long-term operating costs.

Q5: What are the main differences between a 36kV dry-type transformer and a 10kV dry-type transformer?

A: The main difference lies in the voltage level. The high voltage rating of the 36kV transformer is 36kV, which can be directly supplied from the 36kV power grid, thereby eliminating an intermediate 10kV substation link and reducing system investment and maintenance costs. In addition, the 36kV level requires higher insulation strength, larger electrical clearances, and longer creepage distances, which will increase design and manufacturing costs. The 10kV dry-type transformer is more commonly used in conventional distribution systems.

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