630 kVA Cast Resin Dry Type Transformer-66.6/0.55 kV | South Africa 2024

Resin-cast technology, your reliable choice, lighting up infinite possibilities in power!

01 General

1.1 Project Description

The 630 kVA cast resin dry type transformer was delivered to South Africa in 2024, the rated power of the dry type transformer is 630 kVA. The high voltage of this dry type transformer is 66.6kV, and the low voltage is 0.55kV. This high voltage dry type transformer is equipped with a no load tap changer, the tapping range is ±2*2.5% at primary side, the cooling is AN/AF. The transformer adopts an intelligent signal temperature control system, which can automatically detect and display the working temperature of the three-phase winding, automatically start and stop the fan, and has alarm, trip and other functions. Our 630 kVA dry type transformer was designed with advanced technology and adopts high quality material and components, which result in reliable quality and long operation time. This dry-type transformer produced by our company has the characteristics of strong short-circuit resistance, small maintenance workload, high operation efficiency, small size, low noise, and is often used in places with high performance requirements such as fire prevention and explosion prevention. Safe, fireproof, no pollution, can be directly operated in high load power.

We ensure that each one of our delivered units has undergone rigorous full acceptance testing. We provide one-package service from consulting, quoting, manufacturing, installation, commissioning, training to after-sales services. Our products are now operating in more than 50 countries in the world. We aim to be your most reliable supplier as well as your best partner in business!

1.2 Technical Specification

630 kVA cast resin dry type transformer specification and data sheet

1.3 Drawings

630 kVA cast resin dry type transformer diagram drawing and size.

02 Manufacturing

2.1 Core

For specifying cores for cast resin transformers, no-load losses, noise and no-load current are essential quality features which are, in many cases, of decisive importance. Thus, the core design is an important engineering task. This includes the precise geometrical design, determination of the material properties of the magnetic sheet to be used and many details, including design measures such as those to control vibrations, slanting positions and other mechanical requirements.

The iron core is one of the most basic components of the transformer, which is the magnetic circuit part of the transformer. The primary and secondary windings of the transformer are on the iron core. In order to improve the magnetic permeability of the magnetic circuit and reduce the eddy current loss in the iron core, the iron core is usually made of 0.35mm silicon steel sheet with surface insulation. The iron core is divided into two parts: the iron core column and the iron yoke. The winding is set on the iron core, and the iron yoke connects the iron core to form a closed magnetic circuit.

2.2 Winding

Cast resin dry type transformer are characterized by the conductors of the HV winding being embedded completely in an enclosed cast resin body with a smooth surface. Thermal reserves due to special primary insulation allow for overload. cast resin transformers feature vacuum-encapsulated high voltage coils whose winding is designed as a double-layer winding. This means safety in the handling of surge voltages as are caused by lightning strikes or by vacuum circuit-breakers. The low voltage winding of SCOTECH cast resin transformers are almost always designed as foil winding. The benefits of this form of winding are self-explanatory: ● Reduction of extra losses ● Balanced temperature distribution within the winding ● High short-circuit capability

2.3 Final Assembly

Remove the top iron yoke from the stacked iron core and brush epoxy resin on the core column and lower tiee, requiring the epoxy resin to be evenly coated without paint warts, with a thickness of about 0.5mm, and place it at room temperature for natural curing. When painting, pay attention to the diagonal joints of the iron yoke should not be stained with resin. After the resin on the iron core is cured, place the lower press block, bind the high pressure coil with a sling, and set it on the core post. Note that the spacing between the core and the core should be equal. Bind the low-voltage coil to the core column with a sling, and adjust the distance between the high-voltage coil and the core column. If the main air channel has dividers, place them and adjust their positions. Stack the iron yoke and shape it, and the flatness shall not exceed the specified value. Place the upper press block and clamp the upper clamp. Brush with epoxy resin and leave it to cure at room temperature. Place the fan temperature controller according to the drawing requirements. Connect the control circuit of the temperature controller and the fan according to the drawing requirements. 8. Connect the high-voltage cable connection group according to the requirements of the drawing.

03 Testing

Insulation resistance test: Check the insulation capability of the insulated parts.

Short-circuit resistance test: Test the resistance of the short-circuit winding.

Insulation resistance and voltage test: check the voltage resistance of the insulated parts.

Ac voltage test: check the voltage resistance between windings and windings, between windings and ground, and whether there is internal discharge in the insulated parts.

Ac harmonic test: check the insulation capacity between windings and windings and between windings and ground.

Surface insulation strength test: Check the insulation strength between the winding and the shell.

Load loss and no-load loss test: test the loss of the transformer under load and no-load conditions.

No-load start test: check the no-load start performance of the transformer.

Short-time voltage test: Check the ability of the transformer to withstand the rated voltage for a short time.

Short-circuit test: Check the performance of the transformer in the short-circuit state.

04 Packing and Shipping

05 Site And Summary

The resin cast dry-type transformer sets a new benchmark in the industry with its outstanding performance, reliable design, and eco-friendly concept. Offering highly efficient and stable operation, exceptional durability, and adaptability to complex environments, it has become a trusted core component in power systems. Whether in industrial manufacturing, infrastructure development, or green energy applications, the resin cast dry-type transformer delivers unparalleled value. Choosing it is not only a commitment to high-quality electrical equipment but also a proactive step toward a smarter and more sustainable future, ensuring long-lasting and reliable power for every use.