Description

ABB UNITROL 1000 (3BHE014557R0003) Static Excitation System

Product Overview

The ABB UNITROL 1000, with the specific order code 3BHE014557R0003, is a fully digital, thyristor-based static excitation system designed for the automatic voltage regulation (AVR) and protection of synchronous generators in a wide range of applications, from small industrial gensets to medium-sized utility generators. As part of ABB’s renowned UNITROL family, this system represents a compact, reliable, and cost-effective solution for controlling the generator field current to maintain stable terminal voltage and reactive power output.

The UNITROL 1000 is a complete, cabinet-mounted system. It typically integrates all necessary components: a digital AVR controller, a thyristor power stage, field flashing equipment, protection modules, and necessary switchgear (field circuit breaker, crowbar, etc.) into a single, pre-engineered package. The order code 3BHE014557R0003 defines the exact configuration, including input/output ratings, options, and accessories. Its primary function is to convert AC power from the generator terminals (or a separate auxiliary source) into controlled DC power for the generator’s rotor (field winding), ensuring stable power generation under varying load conditions and enhancing grid support capabilities.

Technical Specifications

Parameter	Specification
Model / Order Code	UNITROL 1000 / 3BHE014557R0003
Manufacturer	ABB
Product Type	Digital Static Excitation System
Typical Applications	Synchronous Generators (Hydro, Steam, Gas Turbine, Diesel/Gas Engine)
Rated Field Voltage/Current	Defined by order code.Common ranges: Field Voltage up to 500V DC, Field Current from ~100A to several kA.
Power Source	Generator-Terminal Powered (Potential Source) or Compound Source (combined voltage and current transformer). May include a permanent magnet generator (PMG) option for enhanced fault ride-through.
AVR Controller	Digital Microprocessor-based. Features dual-channel redundancy in many configurations for high availability.
Control Functions	• Automatic Voltage Regulation (AVR): Maintains generator terminal voltage setpoint. • Reactive Power / Power Factor Control: Optional. • Field Current Regulation (FCR): Manual backup mode. • Soft Start (V/Hz Limiter): Protects generator and transformer during start-up/shutdown. • Limiters: Under/Over Excitation Limiter (UEL/OEL), Stator Current Limiter (SCL), V/Hz Limiter.
Power Stage	Three-phase fully controlled thyristor bridge. Air-cooled or forced-air cooled. Includes fusing and surge protection.
Field Flashing	Integrated system for initial generator build-up (from battery or AC source).
Protection & De-Excitation	• Field Overcurrent Protection • Field Ground Fault Detection • Thyristor Fuse Failure Monitoring • Instantaneous De-Excitation (Crowbar / Jump Start Discharge Resistor): For rapid field energy dissipation in fault conditions.
Communications	Standard serial interfaces (RS-485/232) for MODBUS RTU/JBUS protocol. Optional Profibus DP, DeviceNet, etc.
Human-Machine Interface	Local control panel with LCD display and keypad for setpoint adjustment, mode selection, and real-time data monitoring.
Redundancy Options	Often configured with dual AVR channels (Auto/Manual) and automatic backup logic.
Standards	Complies with IEEE 421.2, IEC, and other major international standards.

UNITROL1000 Z.V3 3BHE014557R0003

Main Features and Advantages

Proven Digital Control Platform: Utilizes a robust, microprocessor-based AVR with advanced control algorithms, providing superior voltage stability, fast response to load changes, and precise reactive power control compared to analog systems.
High Reliability & Built-in Protection: Designed for 24/7 operation in demanding environments. The integrated protection functions (UEL, OEL, SCL, V/Hz) safeguard both the generator and the exciter itself from abnormal operating conditions.
Excellent Grid Support: Features like the Under Excitation Limiter (UEL) and Over Excitation Limiter (OEL) allow the generator to operate safely within the P-Q capability curve, contributing to grid voltage stability. Fast de-excitation capability enhances system protection.
User-Friendly Operation & Diagnostics: The local LCD panel and remote communication capabilities provide clear access to setpoints, real-time measurements (V, I, P, Q, field data), event logs, and fault records, simplifying operation and maintenance.
Compact & Pre-Engineered Design: As a complete system in a cabinet, it reduces engineering, installation, and commissioning time. It is a plug-and-play solution matched to the generator’s specifications.

Application Fields

The UNITROL 1000 is applied across industries where synchronous generators require precise and reliable excitation control:

Power Generation (Utility & IPP): Medium-sized hydroelectric, steam turbine, and gas turbine generators.
Marine & Offshore: Main and auxiliary generators on ships and oil platforms.
Industrial Plants: Captive power plants in mining, cement, paper, and chemical industries.
District Heating & Cogeneration: Gas engine and diesel generator sets for combined heat and power (CHP).
Emergency Standby Power: For critical facilities like hospitals and data centers.

ABB UNITROL 1000 3BHE014557R0003 Static Excitation System

Description