2.3.9
Efficiency
**************************************************************************
NOTE: Minimum efficiencies at full load are as
follows:
UPS capacity
Single Module
Multi-Module
15 kVA to 30 kVA
80 Percent
---
31 kVA to 125 kVA
85 Percent
---
Above 125 kVA
90 Percent
89 Percent
Delete system efficiency requirements for single
module UPS systems.
**************************************************************************
a.
Minimum Single-Module Efficiency:
[90] [_____] percent at full
load kW.
b.
Minimum System Efficiency:
89 percent at full system load kW.
2.4
UPS MODULE
2.4.1
UPS module shall consist of a rectifier/charger unit and a 3-phase inverter
unit with their associated transformers, synchronizing equipment,
protective devices and accessories as required for operation.
2.4.2
Rectifier/Charger Unit
Rectifier/charger unit shall be solid state and shall provide direct
current to the dc bus.
2.4.2.1
Input Protective Device
Rectifier/charger unit shall be provided with an input protective device.
The protective device shall be sized to accept simultaneously the
full-rated load and the battery recharge current. The protective device
shall be capable of shunt tripping and shall have [_____] amperes
symmetrical interrupting capacity. The protective device shall have
provision for locking in the "off" position. A surge suppression device
shall be installed at the UPS input to protect against lightning and
switching surges.
2.4.2.2
A dry-type, isolated-winding power transformer shall be used for the
rectifier unit. The transformer's hottest spot winding temperature shall
not exceed the temperature limit of the transformer insulation material
when operating at full load. The transformer insulation shall be Class H,
150 degrees C rise. Transformer connections shall be accessible from the
front.
2.4.2.3
Power Walk-In
Rectifier/charger unit shall be protected by a power walk-in feature such
that when ac power is returned to the ac input bus, the total initial power
requirement will not exceed 20 percent of the rated full load current.
SECTION 16265A
Page 20
Previous Page
