Series Soft Starter Device
Purpose
Series soft starter device (SSS) is designed to perform consecutive start of several HV motors be means of a single thyristor-based controller.
Applications
- SSS is used across variety of industries and is designed to consecutively start several motors in a soft manner.
- Application of SSS:
- Water supply utilities: pumps for water lifting/pumping station, compressors/fans for aeration stations
- Compressors for metallurgy and automobile factories
- Compressors for blast furnaces
- Factory ventilation systems
- Sledgehammers/presses
- Water intake pumps for thermal power plants
- Compressors for gas-based thermal power plants
- Pumps for heating systems
- Concrete mills/mills for ore-dressing plants
- Sludge pumps for ore-dressing plants
- Oil-transfer/separator pump stations
- Slush pumps
- Shaft ventilation
- Conveyors for mines
- Compressors for pulp and paper plants
- Crushing machines
- Shipbuilding
- Etc.
Structure
SSS consists of three main parts:
1. Soft starter
Soft starter is a thyristor controller that features motor soft start/stop functions. Solcon HRVS-DN thyristor controller is used as the main unit of the device.
2. Switchgear rated for voltage 6 or 10 kV
The basic switchgear unit is the ELTIMA switchgear manufactured by OOO Electronmash Engineering ELTEMA switchgears are intended to receive and distribute AC 3-phase 50 Hz electric power, rated for 6-10 kV isolated or grounded grids via an arc-suppression reactor or a resistor.
3. Control cabinet (CC)
Control cabinets produced by Electronmash JSC are designed for centralized control of starting a number of HV asynchronous motors by means of a single soft starter.
Series Soft Starter - Specifications
Parameter | Parameter value |
Number of motors | As required |
Time between starts | 30 minutes as standard; higher power soft starter leads to reducing time < 30 minutes |
Auxiliary circuits voltage | 220 VDC |
ELTEMA switchgear - Specifications
Parameter | Parameter value |
Rated voltage (kV) | 6; 10 |
Maximum operation voltage (kV) | 7.2; 12 |
Busbar rated current (A) | 630; 1000; 1250; 1600; 2500; 3150 |
Rated current of main circuits (A) | 630; 1000; 1250; 1600; 2500; 3150 |
Rated tripping current of the circuit breakers integrated to switchgear (kA) | 12.5; 16; 20; 25; 31.5; 40 |
Short-time withstand current (amplitude) (kA) | 51; 64; 81; 102 |
Short-time thermal current (kA) | 20; 25; 31.5; 40 |
Short-time thermal current duration (s) - Main circuits – Ground circuits |
3 1 |
Rated voltage of auxiliary circuits (V) - Control and alarm circuits – Light and heating – Electromagnetic interlocks |
100 AC, 110 DC, 220 AC/DC 220 AC 220 AC/DC |
Cabinet dimensions (mm) - Width - Depth - Height |
650; 750; 800; 900; 1000 1400; 1500 2100 - 2400 |
Weight (kg) | Over 480 |
Schematics Example of a solution based on HRVS-DN controller intended to start three motors:
Input | |
Series soft starter for starting 3 motors | |
Common starting bus |
Principle of operation Serial soft starter will be used as an example. This solution allows for starting up of up to 3 motors in soft mode with a set time delay between the starts. Time delay (pause) between starts is required for thyristors of the soft starter to cool down. By default the time delay is set to 30 minutes. This time delay can be reduced by overrating soft starter power. When starting a motor connected to section I, the soft starter is supplied from the feeder number 3. When starting a motor connected to section II, the soft starter is supplied from the feeder number 6. When power is applied to the soft starter, appropriate cell of the starting bus is switched on which results in soft acceleration of motor. When steady speed has been reached, appropriate motor bypass cell is switched on whilst the starting cell is switched off. Once the starting cell is off, power is removed from the soft starter for it to cool down during the set time delay. Once the timer has expired and thyristor temperature is down, the soft starter is ready to start next motor. SSS is controlled by the system enclosed in Control Cabinet. All signals from cells and from soft starter are connected to the Control Cabinet. Motors can be started locally (by means of door controls), and remotely (near a machine). Series soft starter is controlled by means of operator panel, mounted on the door of Control Cabinet. Should the soft starter run out of order it is possible to run a motor directly, and for mission-critical objects two soft starters are used – one starter is the main unit, another one is the cold redundant unit.
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