AC sources, Electrical characteristics

Specification guide

Single UPS, three-phase, 160 to 500 kVA (cont.)

4.AC sources

4.1.Normal AC source

(rectifier input)

The normal AC source supplying the UPS shall, under normal operating conditions, have the following characteristics:

ωRated voltage: 380 - 400 or 415 Volts rms at full rated load Pn

ωInput voltage range: 250 V (at 30% load) to 470 V

ωNumber of phases: 3, a neutral is not required

ω Frequency: Hz ± 10%

4.2. Bypass AC source

(automatic-bypass input)

The characteristics of the bypass AC source supplying the UPS in the event of an inverter shutdown (maintenance, failure) or an overload (short-circuit, very high inrush current) shall be the following:

ω Voltage:

volts, ± 10%

ωNumber of phases: 3 ph + N + earth (a non-distributed neutral is possible)

ω Frequency: Hz ± 8% (adjustable up to ± 2 Hz)

Outside these tolerances, it shall be possible to supply the load, but in downgraded mode.

5. Electrical characteristics

5.1. Rectifier and charger

5.1.1. Power supply

The PFC rectifier, drawing sinusoidal current, shall be supplied by the normal AC source, without a neutral. It shall provide power for the load as well as charge or float charge the battery. The battery charger shall be supplied by the rectifier to avoid transmitting any AC fluctuations to the battery.

5.1.2. Inrush current

A device shall be provided to limit inrush currents.

When AC power fails and during genset start, the rectifier shall limit the power drawn by implementing a walk-in for ten seconds.

5.1.3. Phase sequence

A device shall check that the phase sequence is correct to protect the power system from the effects of incorrect connections. The device shall also check the bypass AC input.

5.1.4. Operating mode

The standard charger shall be sufficient to charge the battery rapidly. For a backup time of …[5 / 10 / 15 / 20 / 30]

…minutes, battery recharging shall take less than …[4 / 6 / 7 / 8 / 9 hours]… (values after discharge to Pn/2 and recovery of 90% of total battery charge for a recent battery).

5.1.5. Input power factor

The performance level shall be that mentioned in section 3.5, i.e. PF > 0.99.

5.1.6. Charger regulation and monitoring

The battery recharge system shall include independent regulation and monitoring devices to ensure conformity with standard NFC 58311.

The battery recharge voltage shall be a function of the ambient temperature in the battery room.

5.2. Battery

The UPS shall be equipped with a battery of the …[sealed lead-acid type, mounted and wired in a cabinet identical in aspect to that of the UPS]…[sealed lead-acid type, mounted on shelves] …[vented lead-acid type mounted on racks]… and shall have a service life of …[10 / 12]… years.

The battery shall be sized to ensure a continuous supply to the inverter for at least …[5 / 10 / 15 / 20 / 30…]…

minutes, in the event the normal AC source fails, given that the inverter is at full rated load, i.e.kVA for a power factor PF = 0.9.

Sizing calculations shall assume an ambient temperature between 0°C and 35°C.

APC by Schneider Electric

Edition - 01/2010

Single UPS spec - p. 4

7000 specifications

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