APCQ CAPACITOR BANKS
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5.4.4. Power cables selection
Cables and isolating switchgear should be rated at 1.5 times the nominal capacitor bank current rating and it should
always be coordinated with the current rating of the backup fuses.
Note: when selecting the appropriate cable, please also consider possible future extension of the equipment.
Cross section of supply cables
The standards in force in the concerned country have to be taken into consideration keeping in mind that the current
must be considered as a minimum 1.5 times the nominal current.
Master switch, fuses and circuit breaker
At the location of the APCQ bank installation, the power of the network short-circuit must be taken into consideration
to define the main connection fuses, or rating of the circuit breaker.
To disconnect the unit from the network, HITACHI ENERGY suggests preferably a circuit breaker. A 3-phase discon-
necting fuse or a 3-phase switch with fuses may nevertheless be used.
The circuit breaker should be chosen with a nominal current rating of minimum 1.5 times the rating of the APCQ ca-
pacitor bank.
However, the fuses must be calibrated at least at 1.5 times the rating current of the capacitor bank.
5.4.5. APCQ-L capacitor bank electrical connections
– Electrical connection from bottom only,
Figure 20: APCQ-L bottom entry
– Remove the knock out and pass the power cable in (no grommet provided),
– Connect earth (see 5.4.3),
– Connect the power cables to busbars,
Bar dimensions: 60x3 mm (see Figure 21).
Hole diameter: 9 mm.
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