UPS - Specifications Tab

Figure 1: Specifications Tab

Figure 2: UPS Short Circuit Output Settings for IEC

Option Descriptions
Option Description

UPS kVA

kVA rating of the UPS.

X/R

X/R ratio used for short circuit calculations at the output.
Short Circuit Output

½ Cycle / Initial
  • ANSI: Short circuit contribution at 1/2 cycle (momentary).
  • IEC: Short circuit contribution for initial current.

The value is entered as a multiple of the kVA rating.

Example: A 500kVA/0.48kV UPS has a momentary short circuit contribution of 3000Amps. The short circuit capability in multiples of kVA rating is 4.988 (~5.0). [ multiple = sqrt(3)*3kA*0.48kV/500kVA.]

Interrupting / Breaking
  • ANSI: Short circuit contribution at 5 cycles.
  • IEC: Short circuit contribution for breaking current.

30 Cycle / Steady State
  • ANSI: Short circuit contribution at 30 cycles.
  • IEC: Short circuit contribution for steady state current.

More Information