DEIF PPU-3 Paralleling and Protection Unit

The DEIF PPU-3 is a high-performance paralleling and protection unit designed for generator control in marine, offshore, and land-based power generation applications. This advanced controller integrates generator protection, synchronization, load sharing, and power management functions into a single compact unit. The PPU-3 provides reliable control for single or multiple generator sets operating in island mode or in parallel with the grid.

Key Features

Generator Control and Synchronization

The PPU-3 provides precise generator control with automatic synchronization capabilities. The unit monitors voltage, frequency, and phase angle to ensure safe paralleling of multiple generators or connection to the grid. Synchronization parameters are configurable to match specific application requirements. The controller supports both speed and voltage control through analog outputs or digital communication with electronic governors and voltage regulators.

Protection Functions

Comprehensive protection features ensure reliable generator operation and personnel safety:

• Overcurrent and short-circuit protection (ANSI 50/51)

• Reverse power protection (ANSI 32)

• Overvoltage and undervoltage protection (ANSI 59/27)

• Overfrequency and underfrequency protection (ANSI 81 O/U)

• Loss of excitation protection

• Voltage unbalance protection

• Ground fault protection

All protection functions are independently configurable with adjustable time delays and trip settings, enabling precise coordination with upstream and downstream protection devices.

Power Management System

The PPU-3 incorporates advanced power management functionality for multi-generator installations. The controller automatically starts and stops generators based on load demand, optimizing fuel efficiency and ensuring adequate power reserve. Load sharing between parallel generators is continuously controlled to maintain balanced operation. The unit supports both isochronous and droop load sharing modes, accommodating various governor and system configurations.

Communication and Integration

The PPU-3 offers extensive communication capabilities for integration with plant control systems. Standard interfaces include CAN bus for inter-unit communication between multiple PPU controllers, enabling distributed power management without a separate master controller. Optional communication modules provide support for Modbus RTU, Modbus TCP, PROFIBUS, and other industrial protocols. The unit also features Ethernet connectivity for remote monitoring and configuration.

User Interface

A backlit graphical display provides clear visualization of generator parameters, alarms, and system status. The intuitive menu structure enables easy configuration and operation. Navigation buttons allow operators to view measured values, acknowledge alarms, and perform manual control actions. The display language can be selected from multiple options, supporting international installation requirements.

Technical Specifications

• Power Supply: 24 V DC (18 to 32 V DC)

• Voltage Measurement: Up to 690 V AC directly

• Current Measurement: 5 A or 1 A CT secondary

• Frequency Range: 40 to 70 Hz

• Analog Outputs: 2 for governor and AVR control

• Digital Inputs: 12 configurable

• Relay Outputs: 6 configurable

• Operating Temperature: -25°C to +70°C

Applications

The DEIF PPU-3 is suitable for a wide range of power generation applications:

• Marine vessel power plants and shipboard electrical systems

• Offshore platforms and rigs

• Land-based standby and prime power generators

• Data center backup power systems

• Industrial facilities with multiple generator sets

• Containerized power stations

Certifications and Compliance

The PPU-3 is manufactured under ISO 9001 quality management systems. It complies with applicable marine classification society requirements including DNV, Lloyd’s Register, ABS, Bureau Veritas, and ClassNK. The unit meets CE requirements for electromagnetic compatibility and safety.