Circutor EMF-EMB Series Manual de usuario descargar pdf (Pagina 3)

----- Static switching modules EM ---------- M98116701-20 Pág: 2

1 GENERAL DESCRIPTION

The EM series of static switching modules are the basic blocks used to build static capacitor

banks for power factor (PF) compensation. These static switched capacitor banks use thyristors

instead of electromechanical switchgears to connect and disconnect the capacitors. The static

system is the most convenient in case of large and fast fluctuations of the load current (load

changes lasting a few milliseconds to several seconds). The advantages of the static system are

the connection at zero voltage and the disconnection at zero current, thus avoiding transients. The

ON-OFF switching speed can be as high as 1 operation every 20 ms

Each EM module is used to switch ON and OFF a capacitor step. Notice that a fast power factor

controller like the COMPUTER...f must be used to regulate the power factor using a static

switched capacitor bank . The standard PF regulators aren't fast enough to compensate the fast

load fluctuations.

2 TYPES

The range of static switching modules consists of four main groups :

•

Three phase with fuses , designated as EMF-xx-xxx

•

Three phase without fuses , designated as EMB xx-xxx

Note: The symbol “x" means a reference number or character which depends on the type.

There are different types depending on the operating voltage and the power of capacitor they are

able to operate (see tables 1 to 4)

In the following paragraphs we designate generically as EM modules when we refer to general

or common characteristics valid for all the types.

TABLE 1.- Three phase EMF modules (Built in fuses)

CODE OPERATING

VOLTAGE

TYPE POWER

(kvar)

LOSSES

(W)

R41133 380-400V EMF-40/400 40 115

R41136 380-400V EMF-60/400 60 175

R41137 380-400V EMF-80/400 80 230

R41111 220-240 V EMF-25/230 25 125

R41112 220-240 V EMF-37,5/230 37,5 190

R41114 220-240 V EMF-45/230 45 225

1 2 3 4 5 6 7 8 9 10 11

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Circutor EMF-EMB Series Manual de usuario Pagina 3