Charging and rectifying units VTEU and UBP

Charging and rectifying units VTEU and UBP are provided for conversion of AC into regulated DC for charging of accumulator batteries and power supply of consumers with DC voltage both at buffer connection with accumulator battery and directly.

Application benefits

increased rectifier reliability due to microprocessor control system and galvanic isolation from supply network;
provision of several operation modes and control logics;
automatic on-load voltage supply according to set parameters upon rectifier start-up, operation and switching;
availability of service programs for adjustment, repair and monitoring of rectifier parameters;
complete monitoring of parameters and protection of rectifier and load in all steady and emergency modes.

MAIN FUNCTIONS
TYPES
PROTECTIONS
CONTROL

VTEU and UBP (hereinafter rectifier) provide smooth adjustment of output voltage from 5 % to 110 % of rated voltage; provide IU-characteristics of output voltage in accordance with DIN41773 during operation with accumulator batteries. Deviations of rectifier output current (voltage) in output current (voltage) stabilization mode don’t exceed ± 1 % of output current (voltage) setting value upon acceptable supply network voltage deviations.

Pulsation coefficient of rectifier output voltage is max. 0.08 without capacitive filter at the output and max. 0.04 with the installed capacitive filter upon operation for active load, rated output current and rated output voltage. Rectifier provides parallel operation with similar rectifiers with gross load.

Rectifier is dynamically and thermally resistant to internal and external short circuits.

UBP are designed and manufactured for:

rated output voltages 30, 60 V;
rated load currents 5 A.

AC single-phase supply voltage 220 V, 50 (60) Hz.

UBP is implemented on the basis of pulse converter-stabilizer with high frequency modulation.

VTEU are developed and manufactured for:

rated output voltages 30, 60, 110, 230, 320 and 440 V;
rated currents 50, 100, 150 and 200 А.

AC three-phase supply voltage 380 V, 50 (60) Hz.

VTEU is implemented on the basis of thyristor rectifier with bridge rectification circuit, with isolating transformer from the side of supply network.

Rectifier provides a number of protections disconnecting rectifier upon appearance of emergency situations both in load and in rectifier:

internal and external short circuits protection;
protection against short circuit in power transformer;
charging rate loss protection;
maximum accepted output voltage protection;
overheating of power thyristors;
wrong accumulator battery connection;
wrong input voltage phases sequence;
input power voltage slump or failure protection, as well as rectifier auto-reclosing upon network recovery;
a number of protections for control system separate elements condition monitoring;
protection against rectifier power supply system faults.

Rectifier microprocessor control system provides:

setting of necessary operation modes and parameters with control terminal buttons (handles and buttons on cabinet door) with monitoring of input values on the display;
processing of input analogue, discrete signals and forming of rectifier power keys control pulses, as well as forming of a number of hardwire signals for Customer protection and indication circuits;
automatic on-load voltage supply upon start-up, operation and stop of rectifier according to the set parameters;
communication via RS-485 serial interface with upper level system;
service operation modes for rectifier systems adjustment, repair and monitoring.

All control system tasks are performed by means of software and hardware.

Output current and voltage values in control system are set with control terminal buttons or corresponding switches on the cabinet door with monitoring on display.

Measuring units — voltmeter and ammeter — are located on cabinet door for rectifier output voltage and current measuring.