Fuses for DC voltages DC and PV – DC-voltage fuses and Photovoltaic fuses

Author: Viktor Martinčič

Introduction

We know fuses and "fuses". The consequence of using a incorrect electric fuse in an incorrect electric circuit can cause its explosion and/or the destruction of neighbouring appliances. Greater consequences can occur in the case of destruction of protected appliance – transformer, inverter or the damaging of electrical installation. In the article we will present the problem of activity of fuses in DC electrical circuits as well as several examples of usage of fuses in photovoltaic systems connected to the public grid.

Suitable protection for motor drives

Author: Brane Lebar                                                                                                                                

In today’s industry avoiding “down-time” can be the same as creating income.

The upper statement ever more reflects the current conditions in the industry. Reliability of production systems is becoming more and more important and will even more do so in the future. We all wish for our production devices to be functioning normally. But if a malfunction appears, it should be fixed as soon as possible, for every hour of down-time presents a loss of income. Despite many designers’ opinion that one can protect motor drives using only miniature circuit breakers, experiences show that internal part of frequency converter remains unprotected from short-circuiting.

Keywords: soft starter, frequency converter, IGBT, semiconductor protection fuses