Examples of were reclosers provide integrated solutions to improving the continuity of supply after the occurrence of a phase-to-earth fault. The advent of the microprocessor protection relay within recloser controllers has allowed the introduction of a significant number of new protection features and functionalities. In parallel with these enhancements, the recloser has transformed into an […]
The importance of reliable power connections in protecting electrical installations from the risk of electrical fires. Power connection safety and reliability is not just advisable, it’s essential. Reliable connections are critical in terms of protecting installations against electrical fires, which can inadvertently start as a result of poor or loose connections. A number of factors […]
It is the assembly manufacturer’s responsibility to prove compliance and to take full responsibility for the completed assembly. Users or specifiers of low voltage assemblies in the market today must understand that it is the manufacturer’s responsibility to prove compliance for their product. However, the user or specifier requires a basic understanding of the standard, […]
How to design safe, efficient operation into your machines by focusing on likely residual current scenarios. Machine builders are under continuous pressure to offer more sophisticated, energy-efficient machines with better throughput. A popular response is to use variable-speed frequency-controlled drives. Although effective, this approach can cause nuisance tripping problems or even complete loss of the […]
The technologies and topologies of MV drives, their advantages disadvantages, and their impact on the quality of energy on the mains and motor sides Advancements in semiconductor devices such as insulated gate bipolar transistors (IGBTs) allow medium voltage (MV) drives to be used increasingly to conserve energy, increase productivity and improve product quality. MV drives […]
Increased use of electronic motor drives adds complications to the use of motors in explosive atmospheres. A complex situation exists today in that not only the motor, but the effect of the drive on operations must be taken into account when considering suitability for use in explosive atmospheres. The use of high power electronics in […]
Motor starters limit the inrush current and provide a managed start of the motor. Modern starters provide much more than just current limitation. The inrush current in 3-phase induction motors varies from five to seven times the rated current. In some applications, this level of inrush current may cause a significant voltage drop in the […]
Nobody can afford long downtimes in the industrial production process – permanently high system availability is decisive for business success in the market. The safe provision of 24 V DC control voltage is of central importance for maintaining system uptime. Fault overcurrents must be recognised quickly and switched off selectively. To protect 24 V DC […]
Motor starters limit the inrush current and provide a managed start of the motor. Modern starters provide much more than just current limitation. The inrush current in 3-phase induction motors varies from five to seven times the rated current. In some applications, this level of inrush current may cause a significant voltage drop in the […]
A problem with modern drives using high speed switching devices is the presence of common mode voltages (CMVs) in the variable frequency drive (VFD) feed. Doing away with the isolation transformer reduces the size, weight and cost of the VFD. While the electronics involved are more complex and therefore more costly, the overall benefits outweigh […]
