Electrical Power & Protection


Dry-type transformers go mainstream

December 2019 Electrical Power & Protection

The uptake of dry-type transformers in South Africa is now well beyond ‘niche’ applications, with local specialist Trafo Power Solutions installing a range of sizes across various sectors. “In recent months, we have been involved in projects with small 50 kVA low voltage lighting transformers, right up to 4,5 MVA medium voltage customised units,” says David Claassen, managing director of Trafo Power Solutions. “These have been installed in healthcare facilities, commercial buildings, educational institutions, mines and data centres, as well as at solar energy plants.”

Among its recent contracts, the company has supplied a number of lighting transformers. It has also provided outdoor instrument transformers to facilitate measurement of voltage on overhead lines. These cast-resin voltage transformers (VTs) typically have 33 kV, 22 kV and 11 kV primaries with 110 V secondaries with between 50 VA and 500 VA burden.

In the mining sector, a recent contract was the installation of 200 kVA dry-type transformers. This is often a corrosive environment in terms of water and dust, so a high ingress protection (IP) rating was applied. Claassen adds that a range of materials and paint can also be specified by the customer to further withstand corrosion.

Data centres are a fast growing aspect of the country’s digital economy, and Trafo Power Solutions is supporting this segment with its cast-resin transformers. It recently delivered and cold-commissioned two 2 MVA units for a data centre in Cape Town.

“These facilities obviously require the highest levels of reliability and protection from their electrical and electronic networks,” says Claasen. “The windings and core of our units were designed for a K factor of 13, given the high non-linear load. An electrostatic shield was also installed, along with surge protection of the highest order.”

He notes that there was substantial time pressure to complete the contract, but flexibility and responsiveness at Trafo Power Solutions ensured on-time delivery.

At three small-scale solar plants, Trafo Power Solutions is providing three 800 kVA transformers which will step up power from 400 V to 22 kV. These applications involve a solar inverter for the 100% non-linear load, as well as an electrostatic shield between the primary and secondary windings.

Claassen emphasises that the business prides itself on the level of application engineering for each customer’s specific requirements. “We understand what we are supplying and the risks faced by the customer and we design the solution accordingly,” he concludes. “Industry is certainly showing their faith that dry-type transformers can be applied in a growing range of applications.”

For more information contact David Claassen, Trafo Power Solutions, +27 11 325 4007, david@trafo.co.za, www.trafo.co.za




Share this article:
Share via emailShare via LinkedInPrint this page

Further reading:

Enabling IIoT connectivity for virtual power plants
December 2019, RJ Connect , Electrical Power & Protection
The power grid has seen many changes that have enabled the integration of power from distributed energy sources (DERs).

Read more...
DIN rail power supply for demanding applications
December 2019, ElectroMechanica , Electrical Power & Protection
Automated production systems require power supplies with high stability and safety protection. DIN rail power supply series for such demanding applications are available from Delta Electronics, distributed ...

Read more...
Robust embedded power supply series
December 2019, RS Components SA , Electrical Power & Protection
RS Components (RS) has announced the availability of a new series of AC-DC embedded switch-mode power supplies (SMPS) from TDK-Lambda. The cost-effective RWS-B series of AC-DC industrial power supplies ...

Read more...
Ultra-compact soft starter with protection
December 2019, Vepac Electronics , Electrical Power & Protection
The Tele Christian P4.0/RL/TP/IC electronic soft starter is, with all of its integrated functionality, designed for ultra-compact installation. It helps to reduce wiring material, installation time and ...

Read more...
Latest power monitoring device
November 2019, ElectroMechanica , Electrical Power & Protection
A new panel-mounted power monitoring device (PMD) from Socomec has been launched locally by ElectroMechanica (EM). The Socomec DIRIS A-40 has been designed for measuring, monitoring, and reporting electrical ...

Read more...
WEG IE3 compliant motor control and protection
October 2019, Zest WEG Group , Electrical Power & Protection
The increased move towards the use of IE3 electric motors has made it increasingly important that the most appropriate starting method be selected to ensure optimum performance. With this move it is essential ...

Read more...
Electronic monitoring devices from EM
October 2019, ElectroMechanica , Electrical Power & Protection
A comprehensive range of electronic monitoring and timing devices in different formats for ease of use and retrofit purposes is available from ElectroMechanica (EM). The ElectroDev units are suited to ...

Read more...
Integrated earth leakage protection
October 2019, Schneider Electric South Africa , Electrical Power & Protection
Schneider Electric has announced the introduction of integrated earth leakage protection for its Compact NSX and NSXm moulded circuit breaker ranges. “The award-winning Compact NSX moulded case circuit ...

Read more...
Batteries in motive power applications
October 2019, Comtest , Electrical Power & Protection
When discussing motive power applications, the initial thought is that their batteries must be similar to transportation batteries. After all, this equipment is ‘motive’ just like a car or truck. However, ...

Read more...
Better transformer design improves safety
October 2019 , Electrical Power & Protection
As electricity utilities and users worldwide look to become more safety conscious and efficient in their use of electrical energy, it is important to leverage the improvements that have been made in the ...

Read more...