Recharger converters are designated for conversion of AC to controlled DC for the purposes of rechargeable batteries charging.
General characteristics
- rated currents: from 10 A to 200 A;
- rated voltages: from 30 V to 260 V;
- nominal operating mode – continuous.
Functionality
- charging batteries with a nominal voltage of 220 V, 110 V, 60 V;
- operation in parallel with on-load batteries;
- load power supply without battery;
- work in the modes – “Charging” / “Milking”.
Operating pronciple
The converters ensure adjustable regulation of output voltage from 5% to 110% of nominal voltage.
The output current tolerance of the rectifier in the output current regulation mode is not exceeding ± 1% of the value. Output voltage ripple factor during operation with active load and additional filter is not exceeding 5%.
Scope of equipment
The converter consists of the following functional systems:
- power unit;
- protection system;
- alarm, display and control system.
The power unit consists of switching equipment, input transformer which secondary windings have two different voltage taps, a rectifying silicon-controlled bridge, LC-filter. The power to the rectifier is supply by AC mains with 380V voltage, 50Hz frequency. The silicon-controlled bridge is made as per a 6-pulse rectification circuit on SCR cubicles. The type of silicon-controlled bridge cooling is air natural cooling.
Control system
The microprocessor control system of the rectifier provides for:
- setup of the necessary operation mode, parameters, etc. via buttons on the console terminal;
- handling of input analogue and discrete signals and pulse generation for control of the rectifier power keys, as well as generation of a number of signals such as dry contact for protection and indication circuits of the Customer;
- automated on-load voltage supply during start-up, operation and shutdown of the rectifier in accordance with the specified parameters;
- CAN serial communication with a higher-level system.
All tasks of the control system are fulfilled through software/hardware implementation.
Protection system
The rectifier provides for a number of protections disabling the rectifier in emergency situations both on-load and in the rectifier:
- internal and external short circuits protection ;
- protection against a short circuit in the power transformer;
- charging rate collapse protection;
- maximum permissible output voltage protection;
- power thyristors overheating protection;
- battery misconnection protection;
- protection against input voltage incorrect phase sequence;
- protection in case of input power voltage slump or outage, as well as rectifier reclosing upon the network recovery;
- a number of protections for monitoring CS individual elements states;
- protection against faults in the rectifier power supply system.