Implementation of high-voltage soft start
     Customer: JSC “Arcelor Mittal Temirtau”
RECONSTRUCTION OBJECT SPECIFICATION
     The Sinter Plant is situated on the Arselor Mittal Temirtau theretory.
It is used for slaughtering and sinter supply for the blast-furnace shop.To increase plant productive capacity,
in additioon two cone crushers HP – 400 were installed.
     According to the producer factory recommendation, crusher is completed by phase-wound rotor
induction motor with power 320 kv 400 W, which provided shockless start. However, phase-wound rotor induction motor control
system required continuous technical service of line contactor equipment. Also for motor connection on voltage 400 v, it was
required additional line transformers 6/0,4 kv installation. Because of this, it was decided to install cage induction motors
on voltage 6 rv on the crusher motors. It was solved to use soft start high voltage device for crusher soft start providing.
Requirements to the high voltage soft start system
- It’s necessary to achieve soft start, providing optimal way
of current and moment reducing during motor start.
- To provide standart protection to the high voltage electric
drive.
SOLUTION AND SOFT START SYSTEM CHARACTERISTICS
     To implement this project it was chosen soft start of series HRVS-DN from the delivery “SIEMENS” Ltd.,
which answered all technical requirements. HRVS-DN is difficult and high super-reliable device. Soft start runs the motor by
slowly increasing voltage supplying on it, providing soft start and soft acceleration.
Picture No1
Project implementation period
     Project implementation period is a month (without equipment supply). Commissioning is December, 2007.