Static transfer switch

DOE-SPEC-3021-97

] [To be provided by battery

c. Battery Float Voltage:

[

manufacturer]

d. Voltage Variation

(battery equalized and

discharged

] [To be provided by battery

respectively):

[

manufacturer]

e. Short-Circuit Current

(at nominal voltage):

[

A dc] [To be provided by battery

manufacturer]

3.3.5

Static transfer switch.

ATTENTION:

The transfer conditions should be dictated by the needs of the connected load. Some typical values are: drop-in

input voltage below 90% for 5 ms and 5% frequency deviation for 50 ms.

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3.3.5.1

General. The transfer switch shall transfer from the inverter output

to the internal bypass source when any of the following conditions

occur:

a. The inrush load exceeds the inverter capability as listed below in

paragraph 3.3.5.3.

]% of nominal voltage

b. Drop of inverter output voltage below [

for more than [ ] milliseconds.

c. Deviation of inverter output frequency of [

]% of nominal

value for [ ] milliseconds.

d. Inverter output voltage is outside regulating band in excess of

transient response period (paragraph 3.3.2.2).

ATTENTION:

The retransfer is normally selected by an auto/manual control switch, so the fill-in should show that it shall

transfer.

********************

Retransfer. The transfer switch [shall] [shall not] retransfer to the

3.3.5.2

inverter upon restoration of normal conditions; however, it shall

always retransfer after inrush conditions.