DEIF RMV-112D Reactive Power Divider and Voltage Matching Relay

The DEIF RMV-112D is an essential auxiliary module for multi-generator systems operating in parallel. Its primary function is to ensure accurate sharing of reactive power (kVAR) among paralleled generators and to maintain voltage matching, thereby stabilizing the overall power system.

Functionality and Operation

In parallel operation, simply matching frequencies and voltages at the moment of synchronization is not enough; after closure, the generators must share both active and reactive power proportionally. The RMV-112D addresses reactive power sharing by measuring the generator's reactive current and comparing it to a reference derived from the system. It then generates a correction signal that adjusts the automatic voltage regulator (AVR) of the generator, either raising or lowering excitation to balance reactive output. This "cross-current compensation" method ensures that no single generator carries an undue share of reactive load, preventing circulating currents and potential overloads.

Integration and Setup

The module is designed for easy integration into generator control panels. It connects to the generator's current transformers (typically one phase) and to the AVR's raise/lower inputs or to an external voltage matching interface. The RMV-112D features adjustable droop settings, allowing operators to fine-tune the reactive load-sharing characteristics according to system requirements. LEDs indicate operational status and direction of correction.

Applications

The RMV-112D is widely employed in marine power plants, industrial microgrids, and backup power installations where multiple gensets run in parallel for extended periods. It is compatible with various AVR types and works alongside DEIF controllers or third-party synchronizers. In systems with complex load profiles, the module ensures that reactive power demand is met without overstressing individual generators.

Benefits of Using RMV-112D

By enabling precise reactive load sharing, the RMV-112D prevents issues such as voltage instability, unnecessary wear on AVRs, and nuisance trips due to over-excitation. It contributes to fuel efficiency by ensuring each generator operates near its optimal power factor. The module's robust design ensures reliable performance in electrically noisy environments, and its straightforward interface simplifies commissioning and maintenance. For any parallel genset application requiring stable voltage control, the RMV-112D is a proven solution.