ELECTRIC DRIVE CONTROL SYSTEMS
DESCRIPTION AND SCOPE OF APPLICATION OF FREQUENCY INVERTERS 0,4 KV
Thus, the inverter provides the following capabilities:
The use of frequency converters allows you to achieve such advantages as:
Applications of frequency converters:
The use of frequency converters for pumping equipment is most effective in open water supply systems with variable flow rates. An example can be pumping stations I, II lifting, booster pumping stations, hot water pumps for boiler houses and heating points.
Traditionally, the pumping equipment of the listed objects was carried out using throttling devices on the discharge pipelines of the pumps (valves, gates, etc.). This method is far from effective and is associated with unproductive energy losses on control valves and faster wear of the mechanical part of the pump.
The simplest and most effective solution to the problem is to change the pump performance in order to stabilize the pressure at the outlet of the pump group.
The use of frequency converters to drive conveyors is primarily due to the uneven loading of this equipment. When solving this problem, frequency converters not only ensure smooth start-up and high torque of the motor shaft at low frequencies, but also allow synchronization of the master and slave motors.
As a rule, the master-slave mode is widely used to obtain the same output frequencies of electric motors: the frequency reference is received by the master, the rest of the drives receive signals from the master frequency converter. This scheme is relatively simple and reliable.
About 90% of medium voltage motors drive machines with a “fan” load characteristic. These are pumping units for water supply, transportation of oil and other liquids, compressors of compressed air and gases, fans, air blowers, etc.
Unlike a 220V / 380V frequency drive, which has already become almost household appliances, the introduction of a medium voltage frequency drive is a relatively expensive and lengthy project that lasts more than one month, the success of which depends on the success of all its stages.
As a result of such a project, it is possible to obtain significant energy savings of up to 50%, which is especially tempting considering the amount of money processed by such a drive per hour.