BATTERY CHARGER

Sepahan method electronic is able to design & manufacture industrial rectifiers and battery chargers in a variety of conventional, doublex & parallel. All stages are done by our experts, so various features can be added according to customer request.

Design Criteria

First solution

First solution For having non-stop DC power supply : In the first solution we provide charger system and service system by the same rectifier cells.In case of higher currents, each dc power unit consist of two rectifier cells in 12-pulse configuration.The dc unit converts incoming AC power to DC which supply power to the connected loads and charges the battery at the same time in case of using chopper or dropper between rectifier and load( dropper for normal load and chopper for delicated load), the battery stores energy and is “floated” on the DC bus, ready to supply DC power to the load, as the input Ac supply voltage is is interrupted. During normal operation all rectifiers are operate in parallel to this cell will disconnect electrically from AC, the others shall carry the loads and failed cell will alarmed.The battery units shall be split for individual of line boost charging and shall automatically return to service in the event of an emergency.

Second solution 

Second solution For having non-stop DC power supply :In second solution it will provide charging system separated from service system.

In this case each Batteries charger consists of one rectifier cells for service loads & one rectifier cell for charging. That is connected in two separate DC bus.

The rectifiers cells convert incoming AC power to DC power as specified before.

The charger cells supply charging DC bus and could charge the batteries in boost charging mode while the other bus still working on desired voltage.

The DC service bus also connected to batteries by power diodes and in case of fail of network the batteries (med point) will feed the service bus.

The DC contactor is foreseen for connecting two DC bus in the time of failing network or in floating charge period

The using in these way there is the possibility to mention DC service into desired voltage up to+ 1%

In the case of failing charger cell there is the possibility to charge the batteries in floating mode through rectifier cells.

Basic Construction 

Rectifier cell

The rectifier cells are static and full automatic type and dimensioned for 25 up to 500 Amp on desired voltage.

The rectifier cells are Compact and easy removable type.

In the event of any rectifier cell in fail the others in parallel should be operated independently 

Each rectifier cell is completely assembled and wired in draw able suitable case that is inserted in to charger unit. The rectifier cell will be connected to input and output by plug in material mounted in rear of cell.

Any rectifier cell is equipped with the following;

Input circuit breaker

Input Contactor

Input CTS

Rectifier Bridge

Filters

Measuring device & inductor

Out put fuse

Capacitors charging devise

 Firing equipments & protection device

Control system for any rectifier cell should be given by main control system (see drawing No.)

The main cabinet shall be cleaned primed and painted with common practice produce.

Third solution For having more reliable non stop DC power supply (batteries charger) for rail application and sofisticated load.

Design Samples

 MNBC ( NORMAL BATTERIES CHARGER ) :

Electrical characteristics

Rectifier cell

AC input

Nominal voltage :

Voltage range :

Frequency :

380 , 230 volt 3 phase

15%

50Hz, 60Hz ±5%

Nominal voltage :

Acceptable voltage range :

Ripple :

Efficiency :

Batteries type :

Batteries capacity :

Charging mode :

48 - 72- 96- 120- 240- 360 VDC

with charging variation

Max 3% in full load (1% in request)

95%

Pb, Nicad

50- 150- 250- 500- 3000AH

Constant current constant voltage as per standar

Indicators

Output DC current A

Output DC voltage indicator

Pilot lamp for charging capacitors

(more in request)

Protection & signaling

Protection

Phase fault

Over current

Over Temperature

Short circuit

Alarms and Status Indicators

The alarm systems are displayed at the power cabinet by means of Mimic illuminated path whitch illuminate the switch situation and the illuminated enunciators will foreseen for  following fault:

AC input fail

Rectifier cell 

Battery running down

Battery low

Short circuit

And also over any Rectifier is mounted the electronic cards and by subprint carda over it could find led indicator for normal operation .

Earthing system

All parts of cabinet should be connected in to good earth by means of wire into earth bus bar and all draw able part should be connected into earth by earthling blade.

MSBC (STABLIZED OUT BATTERIES CHARGER) :

Industrial, heavy duty Battery Charger module with full galvanic insulation. Is designed to supply DC loads with stabilized continuous supply meanwhile the system is charging the batteries for Industries such as Steel Oil & Gas, Petrochemical, Power & Utilities applications.

Electrical characteristics

Rectifier cell

AC Input:

Nominal voltage :

Voltage range :

Frequency :

DC Output:

Nominal voltage :

Acceptable voltage range :

Ripple :

Voltage regulation :

Efficiency :

Batteries type :

Batteries Capacity:

Output capacity :

380, 230 volt 3 phase

15%

50Hz , 60Hz ±5%

48 - 72- 96- 120- 240- 360- 480 VDC

with charging variation

Max 3% in full load

1%

95%

Pb,Nicad

50-150-250-500-3000AH

50-150-250 Amp.

The alarm systems are displayed at the power cabinet by means of Mimic illuminated path whitch illuminate the switch situation and the illuminated enunciators will foreseen for  following fault:          

AC input fail          

Rectifiers AC Main voltage          

Rectifier cell 1 fail          

Battery running down          

Battery low          

And also over any Rectifier should be mounted the electronic cards and by subprint over it should find led indicator for normal operation .

Protection & signaling

Protection

Phase fault

Over current

Internal Fault

Over Temperature

Min.& Max. network

Indicators

Output DC current A

Output DC voltage indicator

Pilot lamp for charging capacitors

MRBC (REDUNDANT BATTERY CHARGER) :

Industrial, heavy duty Battery Charger module with full galvanic insulation. Is designed to supply DC loads with stabilized continuous supply meanwhile the system is charging the batteries for Industries such as Steel Oil & Gas, Petrochemical, Power & Utilities applications.

Protection & signaling

Protection

Phase fault           

Over current           

Internal Fault           

Over Temperature           

Min.& Max. network           

Indicators

Output DC current A

Output DC voltage indicator

Pilot lamp for charging capacitors

Alarms and status indicators

The alarm systems are displayed at the power cabinet by means of Mimic illuminated path whitch illuminate the switch situation and the illuminated enunciators will foreseen for  following fault:

AC input fail

Rectifiers AC Main voltage

Rectifier cell 1 fail

Rectifier cell 2 fail

Battery running down

Battery low

And also over any Rectifier should be mounted the electronic cards and by subprint over it should find led indicator for normal operation .

MFBC (FULL REDUNDANT BATTERY CHARGER) :

Industrial, heavy duty Battery Charger module with full galvanic insulation. Is designed to supply DC loads with stabilized continuous supply meanwhile the system is charging the batteries for Industries such as Steel Oil & Gas, Petrochemical, Power & Utilities applications.

Protection & signaling

Protection

Phase fault           

Over current           

Internal Fault           

Over Temperature           

Min.& Max. network           

Indicators

Output DC current A

Output DC voltage indicator

Pilot lamp for charging capacitors

Alarms and status indicators

The alarm systems are displayed at the power cabinet by means of Mimic illuminated path whitch illuminate the switch situation and the illuminated enunciators will foreseen for  following fault:

AC input fail

Rectifiers AC Main voltage

Rectifier cell 1 fail

Rectifier cell 2 fail

Battery running down

Battery low

And also over any Rectifier should be mounted the electronic cards and by subprint over it should find led indicator for normal operation .