ABB UNITOL series excitation regulator and supporting components

ABB UNITOL series excitation regulator and supporting components, used for excitation control and regulation of synchronous generators, classified and interpreted as follows: # # # 1. Core series: Siemens UNITOL excitation regulator

UNITROL is a classic excitation regulation system brand from Siemens (formerly ABB), used to control the excitation current of synchronous generators, stabilize the output voltage of generators, and control reactive power. It is a "voltage stabilizer" for power systems (power plants, grids).

-* * Basic Model * *:

-UNITOLO1000: Universal excitation regulator, suitable for small and medium-sized generators (such as diesel generators, small hydropower), supports manual/automatic excitation regulation, and has over excitation and under excitation protection functions;

-UNITRAL1005: Enhanced with added communication interfaces (such as Modbus and Profibus), capable of connecting to power plant DCS systems for remote monitoring (such as unmanned power stations);

-UNITRAL1010/1020: A high-end digital model that supports complex excitation control algorithms (such as PID adaptive regulation) and is compatible with large steam turbine generators and hydro generators. It has dual channel redundancy (seamless switching in case of faults) to ensure the continuous operation of power plants.

-* * suffix interpretation * *:

-* * -15/-0011/-0002 * *: Hardware configuration or software version differences, such as -0004 may represent support for 4-channel analog input, adapted to different generator capacities (such as 30MW/100MW units);

-PM40: Expansion of Power Module, PM40 represents 40A excitation current output module, used to drive the excitation winding of the generator. ###2、 Supporting components and protocol adaptation models

- **UNC4672AV1/HIEE205012R1**：

The UNC prefix may represent "Unitrol Control Unit", 4672AV1 is the specific module model, and HIEE205012R1 is the standard order number for Siemens industrial automation products (R1 represents the revised version), presumably the core control board of the UNITOL system (such as CPU module, signal processing module), responsible for excitation regulation algorithm calculation and signal acquisition.

-UNS series (UNS0074-FP1, UNS0119A-P, V101, etc.):

UNS is highly likely to be the 'Unitrol Auxiliary System', with suffixes such as FP1/V101 representing functional types:

-* * - FP1 * *: It may be a "Power Supply" module that provides the DC power required by the excitation regulator (such as 24VDC) and has overvoltage protection;

-* * - P, V1 * *: may be a "Protocol Module" that supports communication with generator protection devices and power grid dispatch systems (such as IEC 61850 protocol);

-UNS2880-P-FP1: A composite functional module that may integrate power and signal conversion functions, suitable for the excitation system retrofit of old units. ###3、 Application scenarios and industrial value

-The core of the power system: The excitation system is the "pacemaker" of the generator. The UNITOL series ensures voltage stability of the generator during load fluctuations (such as sudden increases in power consumption in the factory) by accurately controlling the excitation current, avoiding grid collapse;

-* * Power Plant Safety Redundancy * *: The dual channel redundancy design of UNITOLO1010/1020 can switch to the backup channel within 0.1 seconds in case of a main channel failure, ensuring "zero shutdown" of thermal power plants and hydropower stations (with losses exceeding one million for one hour of shutdown);

-The renovation of old units is urgently needed: A large number of power plants that were put into operation before 2000 are still using the old UNITOL model, and replacing the new system requires the reconstruction of control logic and wiring, which is extremely costly (with a single unit renovation exceeding ten million). Therefore, this series of spare parts (such as the UNS0074-FP1 power module) is still the key to "extending the life" of the power plant.

Tags: UNITROL1000, UNITROL1005, UNITROL1010