1. 3 system description 1 Design Requirements ups module




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1.0 GENERAL

1.1 SUMMARY


This specification defines the electrical and mechanical characteristics and requirements for a continuous-duty three-phase, solid-state, uninterruptible power system (UPS). The UPS shall provide high-quality AC power for sensitive electronic equipment loads.

1.2 STANDARDS


The UPS shall be designed in accordance with the applicable sections of the current revision of the following documents. Where a conflict arises between these documents and statements made herein, the statements in this specification shall govern.

  • ANSI C62.41 (IEEE 587)

  • ASME

  • CSA 22.2, No. 107.1

  • FCC Part 15, Class A

  • ISO 9001

  • National Electrical Code (NFPA-70)

  • NEMA PE-1

  • OSHA

  • UL Standard 1778

The UPS shall be ETL listed per UL Standard 1778 Uninterruptible Power Supplies, and shall be CSA Certified.

1.3 SYSTEM DESCRIPTION

1.3.1 Design Requirements - UPS Module


A. Voltage. Input/output voltage specifications of the UPS shall be:

Rectifier Input: (_____) volts, three-phase, (_____)-wire-plus-ground.

Bypass Input (for dual-input modules): (_____) volts, three-phase, (_____)-wire-plus-ground.

Output: (_____) volts, three-phase, 4-wire-plus-ground.

B. Output Load Capacity. Specified output load capacity of the UPS shall be (______) kVA at 0.8 lagging power factor.

1.3.2 Design Requirements - Matching Battery Cabinet


A. Battery Cells: Sealed, lead-acid, valve-regulated.

B. Reserve Time: (_____) minutes at full load, 0.8 power factor, with ambient temperature between 20° and 30°C.

C. Recharge Time: to 95% capacity within ten (10) times discharge time.

1.3.3 Modes of Operation


The UPS shall be designed to operate as an on-line, double-conversion, reverse-transfer system in the following modes:

A. Normal - The mission critical AC equipment is to be continuously powered by the UPS inverter. The rectifier/charger derives power from a utility AC source and supplies DC power to the inverter while simultaneously float-charging a power reserve battery.

B. Emergency - Upon failure of utility AC power, the mission critical AC equipment is to be powered by the inverter, which without any switching obtains its power from the battery. There shall be no interruption in power to the critical load upon failure or restoration of the utility AC source.

C. Recharge - Upon restoration of utility AC power, after a utility AC power outage, the rectifier/charger shall automatically restart, walk-in, and gradually resume providing power to the inverter and also recharge the battery system.

  1. Bypass - If the UPS must be taken out of service for maintenance or repair, or should the inverter overload capacity be exceeded, the static bypass transfer switch shall perform a reverse transfer of the connected equipment from the inverter to the bypass source without interruption in power to the mission critical AC equipment.

1.3.4 Performance Requirements

1.3.4.1 AC Input to UPS


A. Voltage Configuration for Standard Units: three-phase, (_____)-wire plus ground.

B. Voltage Range: +10%, -20% of nominal.

C. Frequency: Nominal frequency +/-5%.

D. Power Factor: Up to 0.96 lagging at nominal input voltage and full rated UPS output with the optional input filter. Minimum 0.80 lagging without optional input filter.

E. Inrush current: 800% of full load current maximum.

F. Current Limit: 115% of nominal AC input current maximum and 100% of nominal for optional generator operation.

G. Input Current Walk-In: 15 seconds to full rated input current maximum. Field selectable 5 or 20 seconds.

H. Current Distortion: 10% reflected input THD maximum at full load with the optional input filter; 30% reflected input THD maximum at full load without the optional input filter.

I. Surge Protection: The UPS shall be able to sustain input surges without damage per criteria listed in ANSI C62.41 Category A and B.

1.3.4.2 AC Output, UPS Inverter


A. Voltage Configuration: three-phase, 4-wire plus ground

B. Voltage Regulation:

 0.5% three-phase RMS average for a balanced three-phase load for the combined variation effects of input voltage, connected load, battery voltage, ambient temperature, and load power factor.

 1.0% three-phase RMS average for a 100% unbalanced load for the combined variation effects of input voltage, connected load, battery voltage, ambient temperature, and load power factor.

C. Frequency: Nominal frequency +/-0.1%.

D. Frequency Slew Rate: 5.0 Hertz per second maximum. Field selectable from 0.1 to 5.0 Hz per second.

E. Phase Displacement:

 0.5 degree for balanced load,

 1.0 degrees for 100% unbalanced load.

F. Bypass Line Sync Range:

 0.5 Hertz,

Field selectable  0.5 to 5.0 Hz.

G. Voltage Distortion:

1% total harmonic distortion (THD) for linear loads.

2.5% THD for 100% nonlinear loads (3:1 crest factor) without kVA/kW derating.

H. Load Power Factor Range: 1.0 to 0.7 lagging without derating.

I. Output Power Rating: Rated kVA at 0.8 lagging power factor.

J. Overload Capability:

125% for ten minutes (without bypass source).

150% for one minute (without bypass source).

200% for 10 cycles, pulse paralleling with the static switch.

K. Inverter Output Voltage Adjustment: +/-5% manual adjustment.

L. Voltage Transient Response:

100% load step  5.0%.

Loss or return of AC input power  1.0%.

Manual transfer of 100% load  3.0%.

M. Transient Recovery Time: to within 1% of output voltage within one cycle.

N. Voltage Unbalance: 100% unbalanced load  1%.

O. Fault Clearing: Sub-cycle current of at least 300%.
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