Efficient Water Treatment and Distribution
In another scenario, managing the variable flow rates will require a variable speed drive in order to achieve an animated effect. In the same way, to obtain a constant water pressure in the showers on every floor of a hotel simultaneously, regardless of the flow rate, the pressure will be regulated by means of a variable speed drive.
A typical problem encountered in a water board in the South, where the power supply was erratic, frequent tripping and failures of motors, operating on gen-sets necessitated reduced starting currents, hammering and low power factor.
Energy Efficiency and Reliability With Uneven Power Supply
The Variable Speed Drive (VSD) provides an answer to all these mentioned issues apart from saving energy as well. The ‘speed’ reference comes from a process regulator (flow or pressure) ensuring an optimal operation apart from protecting motor from all power issues, and enhancing availability. Today, almost all the motors in that water board have VSDs as a standard.
Variable Speed Drive (VSD) for Waste Water Treatment
The introduction of VSD in a sewage plant to drive asynchronous motor, replacing other mechanical solutions based on control valves, recorded significant energy savings and operating costs. Its main advantages include the suppression of pressure shocks (water hammer) during starting and stopping.
It forms the ideal partner to the ‘water hammer arresters’ fitted in distribution systems – thereby extends the service life of hydraulic equipment, and hence reduces overall costs. A further advantage is the reduction in the starting current, which in the case of large equipment helps in cutting installation costs...