The voltage regulator SPAU 341 C is designed for automatic and manual voltage regulation for power transformers with on-load tap-changers in distribution substations. The regulator can be used in association with a single power transformer by measuring voltage alone. When two or three power transformers are run in parallel and more sophisticated regulating principles are used the voltage regulators need to measure both voltage and current. Further, a means of communication between the regulators must be provided. When two transformers are running in parallel three different operating principles can be selected.
Features:
- Comprehensive voltage regulation for power transformers with on-load tap-changers in distribution substations
- 1 A and 5 A tappings on the energizing phase current inputs
- Two-stage undervoltage relay module containing a higher undervoltage stage U< and a lower undervoltage stage 3U<<
- Selectable rated energizing input voltage of phase-to-phase voltage measurement: 100 V, 110 V, 120 V
- Three-phase overcurrent and undervoltage blocking
- Line-drop compensation
- Maximum three transformers can be operated in parallel, either in a master/slave connection, in the minimizing circulating current connection or using the negative reactance principle
- Tap changer position measurement
- Local man-machine communication via push-buttons and digital display on the front panels of the regulator modules
- Serial interface for connecting the regulator to higher-level data acquisition systems, local/remote control systems or other host systems
- High immunity to electrical and electromagnetic interference
- Continuous self-supervision of regulator hardware and software for enhanced system reliability
- Auto-diagnostic fault indication to facilitate fault location