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
SOLUTION AND SOFT START SYSTEM CHARACTERISTICS
- 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
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.
Project implementation period
Project implementation period is a month (without equipment supply). Commissioning is December, 2007.