AC sources, Electrical characteristics

MGETM GalaxyTM 6000 : Specification guide

Parallel UPS, three-phase, 250 to 3000 kVA*

* Power rating for an N+1 redundant configuration

3.5 - Limitation of harmonics upstream of the UPS

The UPS system shall not draw a level of harmonic currents that could disturb the upstream AC system, i.e. it shall comply with the stipulations of guide IEC 61000-3-4.

To that end, it shall be possible to equip each rectifier/charger input with a filter of the type …[compensated LC / non-compensated LC / with contactor / double-bridge / phase shifting]...

If necessary, it shall be possible to use an electronic active filtering system to obtain, at the normal AC input, the following levels, constant from 50% to 100% load:

ωtotal harmonic current distortion (THDI) upstream of the rectifier/charger not exceeding 4%;

ωinput power factor (pf) greater than 0.94.

3.6 - Efficiency

Overall efficiency shall be greater than or equal to:

ω95% at full rated load (In);

ω93% at half rated load (In/2).

3.7 - Noise level

The noise level for each unit, measured as per standard ISO 3746, shall be less than:

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ω69 dBA () for 250 and 300 kVA units).

ω72 dBA () for 400, 450, 500 and 600 kVA units).

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4 - AC sources

The UPS shall be designed to receive power from the sources listed below.

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;

ω voltage:

volts, ± 15%;

ωnumber of phases: 3 + N + earth;

ω frequency: Hz ± 10%.

4.2 - Bypass AC source

(static-bypass input, if separate from rectifier input)

The bypass power supplying the UPS in the event of an inverter shutdown (maintenance, failure) or an overload (short-circuit, heavy inrush currents, etc.) shall have the following characteristics:

ω voltage:

volts, ± 10%;

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

ω frequency: Hz ± 5% (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 - Supply

The rectifier and charger module shall be supplied via the normal AC input (see § 4. AC sources) and shall have the characteristics presented below.

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 to 70% of its rating for ten seconds. The remaining 30% shall be supplied by the battery.

5.1.3 - Battery-current limiting

For long battery life, an electronic device shall automatically limit the charging current to the maximum value

APC By Schneider Electric

Edition - 03/2009

Spec. E - 6