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CP Reactive Power Compensation Components

ETI is introducing components for reactive power compensation. It consists of:

• Three-phase capacitors

• Capacity Duty Contactors CEM_CN

• PFC power factor controllers

• Detuning reactors

Rotary cam switches

Rotary cam switches series CS are intended for multiple switching operations in main as well as in auxiliary circuits:

• As motor switches they are designed for direct-online starting and stopping of single- phase and three-phase motors. They also come out as star-delta switches, reversing switches, pole-change over motor switches

• In auxiliary circuits they are assembled in compliance with the switching programme according to preference:

• switches for control, signalling and measuring circuits.

• switches, selector switches and step switches e.g. for transformers and welding apparatuses.

• Group switches e.g. for switching operations of resistors and heaters.

• Control switch with automatic return
 

Residual Current Breaker with Overcurrent Protection

ETI is introducing the only RCBO with 18 mm width, 6kA short circuit capacity, switched neutral line and trip toggle position in the world

High breaking capacity MCB ETIMAT P10

Now available !!! Best performance MCB's available from 0,5-125A in 10kA rated short-circuit capacity; tripping characteristic B,C,D and K

Battery fuse                                                                           

ETI is introducing fuse-links specially designed for for protection of battery storage and UPS systems.

Cylindrical fuse disconnector EFD

ETI is introducing new generation of Cylindrical fuse disconnector for cylindrical fuse-links C.

Residual current circuit breakers (RCCB) B and B+ type

ETI is introducing new RCCB sensitive for alternating, pulsed and smooth direct residual currents with rated deferential currents from 30mA and up to 300mA.

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

 

Installation of over voltage protection in LV systems

 

Author: Denis Imširović, B.SC.E.E.  

 

From old times the human beings have been fascinated by the lightning phenomenon, but unfortunately they were unable to explain it. Nowadays, in the era of computers and other sensitive devices it has become necessary to expand technical possibilities for successful or complete protection of vitally important services.

                                                                                                                      

1. Introduction

 

Technology is entering into the future with big steps; therefore the devices are installed into the areas where can not be imagine a while ago. An enormous quantity of information is used
over the world, which must be properly connected, reach faster transfers and use best possible protection. Now days especially in such an economically and technically developed world
there is no possibility to refuse those demands. Over voltage protection must be considered, as hard cuirass which protects devices and people against strong outside influences, as stroke of
lightning and prevent technological and economical damage.

Over voltages are caused because of following:

• Atmospheric discharges resulting in direct strikes to structures or systems, or large induced voltages caused by those direct strikes
• Over-voltage cause by power switching transients
• Faults in power distribution systems such as line-to-ground contacts, or commingling of power and low voltage telecommunication lines
• Power regulation faults as can occur near large industrial consumers of power or near electrified rail systems

The statistic of damages caused on electrical apparatus is demonstrated in below graph (Picture 1). The biggest share damage on electrical apparatus is caused because of over voltages and ranges between 27% and 35%.

New generation of low-voltage Moulded Case Circuit Breaker, MCCB

 

Author: Denis Imširović, B.SC.E.E.  

 

MCCB is used for protecting of low-voltage electrical wires and connected equipment, against overloads and short-circuits. It is generally installed on secondary side of transformer stations (main switch or for protecting individual branches). In industry we can use it in switchgears or for protecting the motors as well we have big requirements in shipbuilding. For building applications you
can find it as main protection switch.

 

NEW SERIES OF ETIBREAK EB2 IN VIEW OF SELECTIVITY

 

Author: Peter Klenovšek

 

WHAT IS SELECTIVITY?

Selectivity in mean of protective devices is also called by other terms as discrimination or coordination of protective devices. To put it simply, coordination means that downstream devices (breakers/fuses) should activate before upstream devices. This minimizes the portion of the system affected by a fault or other disturbance. At the substation level, feeder breakers should trip before the main. Likewise, downstream panel breakers should trip before the substation feeder supplying the panel.

 

Low-voltage fuses and circuit breakers, comparison of operation in conditions of high short-circuit currents

 

Author: Mitja Koprivšek

 

SUMMARY:

The paper is attempting to describe in a simple way the physical background of low-voltage fuses and circuit breakers operation in conditions of high short-circuit currents. Further, it attempts to draw some conclusions from their operational peculiarities, that substantially influence the practical application of fuses and circuit breakers.