Rectifiers & D.C. Power Supply Systems

D.c. supply systems for electrolysis and graphitization furnaces

   

Main specifications

Parameter name	Value
	Electrolysis						Graphitization furnaces
	Al		Cl		Mg	Na, K
Primary voltage, kV	0 ÷ 220
Current of one set, kA	25 ÷ 100						50 ÷ 120
Total current, kA	100 ÷ 450		100 ÷ 300		100 ÷ 300	100 ÷ 200	50 ÷ 300
Rectified voltage, V	1500		450 ÷ 1000		200 ÷ 600	60 ÷ 200	100 ÷ 300
Number of sets	3 ÷ 9		3 ÷ 6		3 ÷ 6	2 ÷ 4	2 ÷ 4
Rectification circuit diagram	Bridge				Bridge, two opposed star groups with interphase transformers
Pulse number of one set	12
Total pulse number	24 ÷ 72
Types of rectifiers	– diode; – diode with saturable reactors; – thyristor
Accuracy of current maintaining, %	± 1
Voltage regulation coarse fine	by no – load, on – load devices of transformer; by saturable reactors, thyristor firing angle
Power factor (without compensation), not worse	0,9
Cooling of power semiconductors	non – freezing liquid – water; non – freezing liquid – air
Installation	– indoors; – outdoors
Ambient air temperature, °C	from -45 to +55

Delivery set:

• switchgear devices: outdoor   10 ÷ 220 kV;
• rectifier sets, pcs                       3 ÷ 9 (n + 1);
• a.c. buses between transformer and rectifier;
• current meter of series             up to 500 kA;
• automated current control system series ROSELCO MICROSCADA;
• filter compensating unit;
• d.c. buses assembly.

Engineering on "turnkey basis":

• designing, electric and construction works;
• fabrication and complete supply of equipment;
• contract supervision, erection works;
• start – up and adjustment works, commissioning;
• training of personnel;
• servicing.

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