ABB UNITROL 1010 UNS0121A-Z,V1 Compact Digital Excitation Automatic Voltage Regulator

Description

Hardware and Performance Specifications Auxiliary supply: 24 V DC, support 9‑36 V DC wide‑range input Power consumption: ≤20 W Excitation output: continuous 10A DC, short‑time overload 25A DC(10s) Regulation accuracy: steady‑state voltage regulation accuracy ≤±0.2%Un Dynamic response: voltage step‑response time＜20‑50ms Binary I/O: built‑in isolated digital input and relay output channels, for breaker status collection, alarm and trip‑signal output Communication interfaces: Ethernet, USB, RS485; support Modbus‑TCP, Modbus‑RTU protocol 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: IEC 61000‑4 series industrial electromagnetic compatibility standards Dimension & weight: approx.225 × 165 × 80 mm, weight about 2.5 kg Certifications: CE, DNV‑GL approval

Main Functions Real‑time sampling of generator VT voltage and CT current signals, execute AVR automatic‑voltage‑regulation closed‑loop calculation. Support multiple control modes: auto voltage regulation, manual field‑current regulation, constant reactive‑power control, constant power‑factor control. Built‑in complete excitation‑limit functions: over‑excitation limit, under‑excitation limit, V/Hz limitation, field‑current over‑current protection. Drive built‑in IGBT power unit, output adjustable excitation current for generator exciter. Collect field binary status signals: circuit‑breaker auxiliary contact, external interlock signal; output fault‑alarm and protection‑blocking relay contact signals. Event‑logging and disturbance‑recording function, record fault waveform and operation event with time‑stamp. Multi‑communication interfaces realize data interaction with DCS and local HMI panel. Hardware self‑diagnosis detects internal circuit, measuring‑loop and power‑unit fault, upload fault code to upper‑system. Parameter configuration and commissioning are finished by UNITROL‑Tool engineering 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 cabinet grounding. Auxiliary 24 V DC power supply must stay within rated working range. After unit replacement, confirm hardware version UNS0121A‑Z,V1 strictly matches original project configuration, download complete excitation project configuration file. Perform voltage‑loop calibration, excitation‑output test, binary‑I/O point‑to‑point test and communication debugging. This unit is integrated whole‑machine regulator, different hardware versions (V1/V2) cannot be directly interchanged without software adaptation. Confirm no hardware self‑diagnosis fault‑alarm before putting‑into‑service.

Typical Application Scenarios Compact digital excitation regulator for small‑and‑medium synchronous generators in hydropower plants, industrial captive‑power‑stations, diesel gensets and marine power‑system, used for excitation‑system maintenance and spare‑part replacement.

Key Features

1. UNITROL1000 series integrated compact excitation AVR, whole‑machine all‑in‑one design, no extra main‑board required, convenient for small‑unit reconstruction.
2. Multiple selectable control modes, built‑in full‑set excitation‑limit and protection algorithm, guarantee generator safe operation.
3. Fast dynamic response, high‑precision voltage regulation performance.
4. Multiple standard communication interfaces, easy to connect with plant DCS monitoring system.
5. Integrated cabinet‑mount mechanical structure, convenient for on‑site replacement and maintenance; hardware version matching shall be strictly noticed during spare‑part replacement.
6. Widely‑used maintenance spare‑part for ABB small‑and‑medium‑unit excitation‑systems.