BPC T-3100P, Руководство пользователя

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3
1.2 Design Concept
S1 : Inverter input power switch
S2 : Static by-pass input switch
S3 : Maintenance by-pass power switch
S4
: UPS power output
switch
S5 : Battery circuit breaker (optional)
SD1 : Rectifier-1 Input Fuse
SD2 : Rectifier-2 Input Fuse
RECTIFIER:
The first conversion stage (from AC to DC) uses a 3 phase mains voltage (3 wire) neutral
connection is not used. Neutral connection is used out bypass connection circuitry. 2 six pulse rectifiers are
used at UPS, the inputs and outputs of the rectifiers are connected in parallel. The output of rectifiers connected
directly to DC BUS BAR. The DC BUS BAR produced by the rectifier provides both battery charging power and
power to the inverter section.
Each rectifier has seperate fuses and circuit breakers on their inputs. If one of the input power is turned of the
other rectifiers works on, but the total power capacity of the UPS is 50%.
BATTERY GROUP: It provides DC power for inverter in case of mains failure.
INVERTER: It is made by utilizing the latest technology of power transistor (IGBT) and pulse width modulation
(PWM). Inverter converts dc bus voltage into (second conversion) an AC voltage like line voltage. And provides
this voltage and frequency being fixed.
STATIC TRANSFER SWITCH (STATIC BY-PASS):
Two types of bypass circuitry is available for T300P series
UPS
•
Full static switch for parallel systems
•
Half static switch for normal UPS
The circuit block annotated contains an electronically controlled switching circuit, which enables the critical
load to be connected either to inverter output or to a by-pass power source via the” static by-pass line”.
Normally at standart models, the load is connected to the inverter via a contactor K1 (controlled by the static
switch circuits); but in the event of a UPS overload, or inverter failure, it is automatically transferred to the
static by-pass line.
In parallel systems the second static switch is builded, from inverter output, to load.
Inverter
Static By-pass
Static Transfer Switch
Maintenance By-pass
Mechanic Transfer Switch
3 Phase
Line
Input
3 Phase
Load
Output
Battery Group
S3
S2
S1
S5
S4
Figure 1-1 Block Diagram
12 Puls
Rectifier
SD2
SD1