SCB10 dry-type power transformer

1. Product Introduction

Epoxy resin cast dry-type power transformers are manufactured using international design, production, and testing equipment according to strict processes. The products have the characteristics of high reliability and long service life.

According to different usage environments, different protection levels of enclosures can be configured or no enclosures can be configured.

This product is suitable for important or special environmental places such as high-rise buildings, commercial centers, airports, tunnels, chemical plants, nuclear power plants, ships, etc.

2. Product Features

Safe, fireproof, pollution-free, and can operate directly in the load center.

High mechanical strength, strong short-circuit resistance, small partial discharge, good thermal stability, high reliability, and long service life.

Low loss, low noise, significant energy-saving effect, maintenance free.

Good heat dissipation performance, strong overload capacity, and can increase capacity operation when forced air cooling is used.

Good moisture resistance, suitable for operation in high humidity and other harsh environments.

A comprehensive temperature monitoring and protection system. Adopting an intelligent signal temperature control system, it can automatically monitor and display the working temperature of each three-phase winding, automatically start and stop the fan, and have functions such as alarm and trip settings.

Small size, light weight, small footprint, and low installation cost.

3. Process characteristics

The iron core is made of Shanghai Baosteel 30P105 and 120 cold-rolled silicon steel sheets, with a 45 degree stepped fully inclined joint structure. The three shear and two punch iron core corner cutting process and five step step cutting and stacking process are used to improve the magnetic flux distribution at the joint and reduce the vibration energy of the iron core. The integrated solidification of the iron core and the sealing process with insulating resin on the surface have reduced no-load losses, no-load flow, and iron core noise.

The G-voltage coil is wound with F-grade insulated wires, and larger capacity coils are equipped with heat dissipation ducts along the axial direction. This structure has good resistance to current shock, temperature changes, cracking, and excellent heat dissipation performance. Adopting a multi-stage segmented cylindrical structure, it has a strong ability to withstand overvoltage and a very low level of partial discharge. The coil is poured after vacuum drying, and the entire pouring and curing process is completed according to the pre planned process curve. The precise process ensures that the coil has no pores or voids.

The low-voltage coil adopts a foil structure, which reliably solves the problem of unbalanced turns in low voltage and high current coils using wire winding. At the same time, the foil coil does not have axial turns or axial winding helix angles, reducing the axial force of the transformer during short circuit and ensuring that the current density inside the coil can be freely adjusted along the axial direction according to the load distribution of the G-voltage coil, reducing the radial force during sudden low-voltage short circuit. The end of the wound coil is sealed and cured with resin to prevent the entry of various foreign objects and moisture.

4. Reference standards

GB/T10228-2008 "Technical Parameters and Requirements for Dry type Power Transformers"

GB6450-1986 Dry type Power Transformers

IEC726 "Dry type Power Transformers" (International Electrotechnical Commission standard)

GB1094-2007 "Power Transformers"

5. Technical specifications

Capacity range: 80-2500kVA

Voltage level: 10kV

Pressure regulation method: ± 2 × 2.5% or ± 5%

Frequency: 50Hz

Number of phases: 3-phase or single-phase

Connection group label: Y, yno or D, yn11

Impedance voltage: The standard impedance voltage can be found in the technical parameter table

Usage conditions: The ambient temperature should not exceed 40 ℃, the relative humidity should reach 99%, the altitude should not exceed 1000 meters, indoors, and the ventilation rate should be calculated based on the total loss of the transformer, not less than 4m3/KM.min

Cooling method: AN or AF

Protection level: IP00 or IP20 (indoor) IP23

Insulation and heat resistance level: H-level winding allows an average temperature rise of 125K

Temperature limit: 180 ℃

Insulation level:

Rated voltage, power frequency withstand voltage, lightning impulse withstand voltage

10 KV36KV75KV

Temperature measurement and device: digital display of approximate temperature inside the three-phase low-voltage winding, cooling fan

Specially designed according to user requirements, such as high prototype products, high impedance products, on load voltage regulation products, etc

6. Technical parameters:

Main technical parameters of SC (B) 10 resin cast dry-type power transformer