Automatic Voltage Regulator
SPRECON-E-C-AVR
Transformers with motor-driven tap changers can be controlled with automatic voltage regulators. Actuation of the motor drive leads to a voltage change by one tap.
SPRECON-E-C-AVR can be adapted to customer-specific requirements to the greatest possible extent. Moreover, several units can be operated in parallel mode, which is based on the master/follower principle. Thereby, the circulating reactive current is monitored.
If the difference between actual voltage and set-point exceeds a certain limit, a regulation command (”up”, “down”) is initiated.
The AVR unit allows five different set point values that can be selected both locally or remotely. Reliable operation is guaranteed by staggered monitoring of under- and overvoltage with automatic tap changing to the demand voltage, by function monitoring of both the motor drive and the tap changer and by integrated overcurrent blocking.
Setting data is stored into programmable memory (FLASH), which therefore still contains the data after a voltage failure. Auxiliary supply for data back-up is not required. Beside application of SPRECONE-C-AVR as a stand-alone device, automatic voltage regulation can be also integrated into SPRECON-E-C or SPRECON-E-P devices together with other control functions.
A variety of functions are available for the display of the respective process information, such as
- colour changes, movements, text and number displays
- text and bitmap buttons, switches or combo/list boxes
- bar graph, universal controller, numerical value, dynamic text display and pointer instrument for the perfect display of values
- user-programmable ActiveX® controls for individual solutions
- freely adjustable vector elements such as circles, rectangles, lines, etc. and freely definable fonts, colours and various 3D display settings
- libraries with predefined switch symbols as well as complete pre-parameterised fields for energy systems
