ABB UNITROL1000 Series Compact Digital Excitation Automatic Voltage Regulator Family

Description

Main Model Variants ‑ UNITROL 1005: Entry‑level compact AVR, continuous excitation output 5 A DC, peak 10 A DC, without local HMI panel, mainly for OEM and small‑generator applications. ‑ UNITROL 1010: Mid‑range compact AVR, continuous excitation output 10 A DC, 10‑second short‑time overload 20 A DC, no local HMI panel. ‑ UNITROL 1020: High‑performance compact AVR, continuous excitation output 20 A DC, 10‑second short‑time overload 38‑40 A DC, equipped with local HMI display and keypad for on‑site operation.

Hardware and Performance Specifications Auxiliary supply: 24 V DC, 9‑36 V DC wide‑range input; AC auxiliary power supply optional Excitation output: 5 A‑20 A continuous DC subject to model; short‑time overload up to 40 A DC Voltage regulation accuracy: Steady‑state voltage regulation accuracy ≤±0.2 %Un Dynamic response: Fast closed‑loop response for both grid‑parallel and island‑mode operation Binary & Analog I/O: Galvanic‑isolated digital inputs, relay outputs, configurable analog inputs and outputs Communication interfaces: Ethernet, USB, RS485; support Modbus‑TCP, Modbus‑RTU protocols Mounting mode: Cabinet wall‑mount / rack‑mount integrated unit Operating temperature: ‑25 ℃ ~ +70 ℃ Storage temperature: ‑40 ℃ ~ +85 ℃ Humidity: 5‑95 %RH non‑condensing EMC compliance: Comply with IEC 61000‑4 series industrial electromagnetic‑compatibility standards Certifications: CE, DNV‑GL marine certification, partial UL approvalsABB Group

Main Functions Real‑time sampling of generator VT voltage and CT current signals, execute AVR automatic‑voltage closed‑loop regulation calculation. Multiple selectable control modes: auto‑voltage regulation, manual field‑current regulation, constant reactive‑power control, constant power‑factor control. Built‑in complete excitation‑limit and protection functions: over‑excitation limit, under‑excitation limit, V/Hz limitation, field‑current over‑current protection. Optional PSS power‑system stabilizer complying with IEEE 421.5 standard for grid‑connected generators. Integrated IGBT power stage provides adjustable DC excitation current for generator exciter. Collect field‑site binary status signals; output relay‑contact signals for alarm, trip and protection blocking. Event logging and disturbance‑recording function with time‑stamp, support SNTP Ethernet time synchronization for post‑fault waveform analysis. Multiple communication interfaces realize data exchange with plant DCS and upper‑level monitoring system. Hardware self‑diagnosis detects internal circuit, measuring‑loop and power‑unit faults, upload fault codes to local HMI or DCS. Parameter configuration, debugging and firmware upgrade are completed by ABB CMT1000 commissioning software.

Installation Requirement Wall‑mount or rack‑mount installation inside excitation cabinet. High‑power cables and weak‑signal measuring cables shall be routed separately. Ensure reliable protective grounding of the cabinet. Auxiliary power supply shall stay within rated operating range. After unit replacement, confirm hardware part‑number and software package match original project configuration, download complete excitation configuration file. Perform voltage‑loop calibration, excitation‑output test, I/O point‑to‑point test and communication debugging. Different models and hardware versions cannot be directly interchanged without software adaptation. Do not put into service until no hardware self‑diagnosis fault alarm exists.

Typical Application Scenarios Compact digital excitation regulator family for small‑and‑medium‑sized synchronous generators in hydropower stations, diesel‑gas power plants, industrial captive power stations, marine vessels and traction power equipment; used for excitation‑system maintenance and spare‑part replacement.

Key Features

1. All‑in‑one compact excitation AVR family with separate control and communication processors, covering 100 kVA‑80 MVA machine range.
2. Multiple optional software packages, abundant built‑in excitation‑limit and protection algorithms to guarantee generator safe operation.
3. Fast dynamic response and high‑precision voltage‑regulation performance, support island‑mode and grid‑parallel working conditions.
4. Multiple standard communication interfaces, easy to connect with plant DCS monitoring system.
5. Robust cabinet‑mount mechanical structure, convenient for on‑site replacement and maintenance; hardware‑version and software‑package matching shall be strictly observed during spare‑part replacement.
6. Globally‑deployed, widely‑used maintenance spare‑part for ABB compact excitation‑systems.