Other Power Assemblies

The power regulating equipment designed and manufactured with power electronics components with the advantages of simple selection, high reliability, low comprehensive cost, easy installation, nice appearance, fast development speed, and etc.

The power assemblies made of thyristor and diode which are available to be supplied:

• Single-phase rectifier bridge series: including single-phase full control, half control, and rectifier bridge

• Three-phase full-bridge series: including three-phase full control rectification, three-phase half control rectification, and three-phase rectification bridge

• Six-phase rectifier bridge series: including six-phase controllable and uncontrollable rectifier bridges

• AC switch series: including single-phase and three-phase AC switches

For more questions of power assemblies made of thyristor, diode and rectifier for rectification, converting, power switch and control, please consult us, a customer support team with talent and experienced technicians is under serving.

• Cooling modes of assemblies are air cooling, natural cooling, and water cooling with aluminum profile and heat pipe.

• Components of assemblies are power unit, RC absorption capacitor, temperature protection, general or special control function components.

Technical Introduction

1. Three-Phase anti-parallel power unit is composed by two SCR connected in anti-parallel mode on each phase to realize the AC phase-controlled voltage regulation. Each thyristor work for the correspond positive and negative half cycle. So the consistency of the parameters of the two anti-parallel connected SCR is very important as well the gate characteristics and holding current parameters, etc. The consistency of thyristors employed will provide the positive and negative half waves be symmetrical, otherwise the current with DC component will flow through the inductive featured motor, the motor stator will be heated greatly, then motor windings  will be burned and motor will be damaged finally.
2. Runau can provide the high consistency phase controlled thyristor and the related 3 phase anti-parallel power unit in medium voltage of 1200V/3300V but also high voltage of 4500V/6500V.
3. To realize the soft start and protect 6kV and 10kV high voltage motors, it is necessary to connect the SCRs in anti-parallel and then connect them in series to fulfill the high voltage operating requirement. Each phase of 6kV requires 6 thyristors (2 in anti-parallel and 3 groups in series), and each phase of 10kV requires 10 thyristors (2 in anti-parallel, 5 groups in series). In this way, the voltage tolerated of each thyristor is about 2000V, so the forward and reverse non-repetitive rated voltages VDSM and VRSM of the selected thyristor should be 6500V or above. To select the rated current of thyristor, the rated operating current of the motor must be considered. Generally, the selected current of the thyristor should be 3 to 4 times of motor rated current.