Four customized Sine wave filters are now in operation at a customer in the mining industry in northern Sweden. Granitor Systems was commissioned to deliver a container solution for power distribution, where Tramo delivered Sine wave filters as part of the system. Sine wave filters supplied are used in pumps driven by frequency controlled (VFD) motors. High demands in this application led us to develop a customized solution.

Power quality problems in frequency controlled motors can’t be ignored

Voltage conversion with converters and frequency controlled motors can affect power quality, leading to bearing currents, voltage peaks and insulation failures. These problems shorten both motor life and service intervals. Frequency controlled motors are used in countless applications worldwide, making this a problem that can’t be ignored.

Why is a starting current limiter needed?

When a transformer is energized, an inrush current occurs, which can cause a very high current spike for a short period of time. The magnetizing current can then be 10-20 times greater than the rated current of the transformer. This can cause several problems:

– Fuses or earth leakage breakers tripping
– Heavy load on switches and contactors
– Mechanical hum or stress in the transformer core
– Unnecessary wear on electrical installations

High starting currents may force you to choose a larger main fuse, which means a more expensive electricity subscription. In addition, power spikes can affect costs if you are on a power tariff. With a starting current limiter, the risk of fuses tripping is reduced and you can keep a smaller main fuse, saving money.

Did you know that we offer UL-certified products?

We are a flexible supplier and manufacture products to customer specifications, including UL certified ones. For those of you considering or already working in the North American market, UL approval is often a requirement to supply products.

Terminal blocks are the most common interface for transformers. Now we are taking the next step and replacing the classic screw terminals with Push In terminals. We start with the smaller transformers and then gradually continue with the rest of the range.

We are constantly developing our products, and this change is a natural step in that process. But what does PushIn terminal actually mean for you?

• Easier installation: Faster and smoother installation without the need for screws.

• Better vibration resistance: PushIn terminals provide a vibration-resistant connection.

• More modern interface: The transformer is the same one you’re familiar with, but the new terminal block features a modern, user-friendly interface that makes connecting it easier and safer.