Cast resin transformers

10 November 2010 Power Electronics / Power Management

Legrand manufactures a range of energy saving, cast resin transformers designed for the distribution of electrical power, energy co-generation, rectification and traction.

These transformers are used in diverse industries, including the mines and petrochemical sectors, warehousing, data centres, hotels and hospitals, as well as retail and commercial environments.

The transformers, which are manufactured by a Legrand subsidiary, EdM, feature non-flammable insulation liquids, self-extinguishing materials exempt of toxic gas emissions, reduced noise levels and low electromagnetic emissions. The units meet stringent international quality and safety specifications for installation in any environment, including severe conditions. Legrand’s standard distribution transformers have rated power between 100 and 3150 kVA, primary rated voltage up to 36 kV and secondary rated voltage up to 433 V. Special transformers have rated power up to 20 000 kVA and primary rated voltage up to 36 kV.

Unlike oil transformers, these cast resin units can be installed inside buildings and do not require additional building structures. Rubber inserts alleviate the transmission of vibrations between core and windings, also reducing operating noise levels and absorbing thermal expansion of components. Sockets on the MV side adapt the primary voltage to the mains, which can be set with the transformer switched off. Class F insulating material, at 155°C allows for a temperature rise of 100°C and the epoxy resin insulation means low maintenance. The carriage of these units, which allow

safe movement, is pre-equipped for the mounting of IP reinforced enclosures.

Accessories include thermal sensors or thermistors, electronic units for temperature control and forced ventilation systems to increase transformer power in temporary overloads or at high environmental temperatures. Legrand can also supply MV terminations for plug-in connections, surge arrester kits and anti-vibrating supports. Protective enclosures, available with different degrees of protection – IP21, IP31 and IP23 – protect transformers from external environmental impacts and people from the risk of direct contact.

For more information contact Legrand, +27 (0)11 444 7971, [email protected], www.legrand.co.za

Further reading:

Analysis of switch-mode power supply: inductor violations
Altron Arrow Editor's Choice Power Electronics / Power Management
Common switch-mode power supply (SMPS) design errors are discussed, and their appropriate rectification is specified, with details on complications that arise with the power stage design of DC-DC switching regulators.

Read more...

---

Compact PCB-mount SMPS
RS South Africa Power Electronics / Power Management
Traco Power’s 5W PCB-mount switch mode power supply (SMPS) offers high efficiency, and is well suited for a variety of applications in the automation, electronics, electrical and mechanical industries.

Read more...

---

AC-DC brick PSU
Conical Technologies Power Electronics / Power Management
These PSUs have a typical efficiency of up to 92%, and a power factor value of up to 0,99. They are available in 12, 24, 28, 48 and 54 V output versions.

Read more...

---

5 kW switching PSU range
Conical Technologies Power Electronics / Power Management
Mornsun has released a new switching power supply range, the LMF5000-25Bxx, which has a 5000 W capacity, and features universal AC input configurations.

Read more...

---

Reliable charging range
Current Automation Power Electronics / Power Management
Whether you’re powering essential electronics, keeping emergency equipment operational, or maintaining the performance of critical machinery, the need for dependable charging solutions cannot be overstated.

Read more...

---

Microchip expands its mSiC solutions
EBV Electrolink Power Electronics / Power Management
The highly integrated 3,3 kV XIFM plug-and-play digital gate driver is designed to work out-of-the-box with high-voltage SiC-based power modules to simplify and speed system integration.

Read more...

---

Dual-port USB-C power delivery solution
Altron Arrow Power Electronics / Power Management
Infineon’s CYPD7272-68LQXQ is the tray packing option of the company’s dual-port USB-C power delivery solution and features an integrated dual-port USB-C PD + DC-DC controller.

Read more...

---

Parallel redundancy power module
Conical Technologies Power Electronics / Power Management
The LIR40-40 is a wide input range DC-DC module, with a constant output of 48 V at a nominal output current of up to 40 A.

Read more...

---

Motor protection relay front-end
NewElec Pretoria Power Electronics / Power Management
Newelec’s Motor Protection Relay front-end software isn’t just another tool, it’s a game changer that puts control firmly in your hands.

Read more...

---

High-power three-phase supplies
Current Automation Power Electronics / Power Management
The units from Meanwell can either be supplied with a three-phase three-wire delta input of 196 to 305 V AC, or they can use a three-phase four-wire star connection of 340 to 530 V AC.

Read more...

---