Description
1. Product Overview
Model: UNITROL1000, Part No.:3BHE014557R0003 (V3 Main Regulator Version)
It is a full digital static excitation AVR controller, core control component of ABB compact static excitation system. Applicable for synchronous turbo/hydro/gas generators, marine power stations and standby units with capacity from 100kVA to 80MVA, forming complete excitation system with thyristor/IGBT rectifier cabinet. Single-channel or optional 1+1 redundant dual-channel design; interlocks with REG670 generator protection relay to realize voltage regulation, reactive power control and full-set excitation protection, certified to SIL2 functional safety level.
Basic Model Data
- Model: UNITROL 1000
- ABB Part Number: 3BHE014557R0003
- Product Line: UNITROL1000 compact static excitation series, matched with UNITROL1010/1020 power modules
- Type: Digital AVR Excitation Main Control Board
- Applicable Units: Medium & small thermal, hydro, gas and marine synchronous generators (0.1MVA~80MVA)
2. Electrical & Hardware Specifications
2.1 Main Controller Configuration
- CPU: 32-bit dedicated industrial DSP with dual-CPU architecture (independent cores for control and communication)
- Sampling Rate: ≥24 samples per power frequency cycle
- Steady-State Voltage Regulation Accuracy: ≤±0.25%FS; step response time＜20ms
- Commissioning Software: CMT1000, supporting parameter setting, fault oscillography and automatic PID optimization
2.2 Power Supply
- Auxiliary Power: Wide-range AC 85~265V / DC 90~300V dual universal input
- Power Consumption: ≤35W, DIN rail mounted, dual redundant power supply available
- Excitation Power Input: Derived from generator terminal PT three-phase AC 0~300V rectified supply
2.3 Onboard I/O List
| I/O Type | Specification | Application |
|---|---|---|
| AI Analog Input | 6CH, PT three-phase voltage & CT three-phase current AC0~120V/AC0~5A | Terminal voltage, stator current & system frequency acquisition |
| DI Digital Input | 10CH DC24V/DC220V | Field breaker status, cooling fan fault, local/remote switch, unit start/stop signal |
| DO Relay Output | 8CH dry contact AC250V/5A | Fault alarm, de-excitation trip, abnormal system output, excitation fault signal |
| AO Analog Output | 2CH 4~20mA/0~10V | Reactive power & terminal voltage remote transmission to DCS |
| Trigger Output | Pulse signal | Drive pulse output for thyristor/IGBT power cabinet |
2.4 Communication Ports
- Isolated RS485: Modbus-RTU for DCS & REG670 protection connection
- Front DB9 RS232 debug port: Program upload/download & fault waveform reading via local CMT1000
- Optional expansion: Profibus-DP, Modbus-TCP Ethernet module
2.5 Dimension & Ambient Condition
- Dimension: 127×76×178mm(L×W×H), standard DIN rail installation
- Weight: Approx.0.4kg
- Protection Class: IP20 (indoor cabinet use only)
- Temperature: Operating -10℃~+55℃; Storage -25℃~+70℃
- Humidity:5%~95%RH non-condensing; vibration compliance with IEC60068-2-6 & DNV marine certification
3. Core Excitation Control Functions
3.1 Four Regulation Modes
- AVR Auto Constant Voltage: Closed-loop terminal voltage regulation (main operating mode)
- FCR Manual Constant Field Current: Manual control for commissioning & field flashing backup
- Constant Reactive Power(Q): Fixed reactive output after grid synchronization
- Constant Power Factor(PF): Fixed unit power factor operation
3.2 Built-in Excitation Limit & Protection
OEL Overexcitation Limiter, UEL Underexcitation Limiter (ANSI40 Loss-of-Excitation Protection), V/F Overflux Limiter, SCL Instantaneous Stator Current Limiter, rotor overcurrent blocking, soft field build-up & soft de-excitation logic.
Optional PSS Power System Stabilizer: Suppress grid low-frequency oscillation to improve grid-connected stability.
3.3 Fault Diagnosis & Monitoring
- Onboard LED indicators for Power, Run, Fault, Communication and Alarm status
- Event log: ≥500 fault records; oscillography for 10 cycles pre & post fault
- Auto self-test: Full hardware check at power-on & periodic online inspection; fault code displayed on local LCD screen
4. Complete UNITROL1000 System Composition
- Main Controller(3BHE014557R0003): AVR regulation, signal acquisition & logic calculation
- Power Rectifier Unit: UNITROL1010(10A)/UNITROL1020(20A) IGBT/Thyristor modules for DC excitation output
- De-excitation Circuit: DC field breaker + non-linear de-excitation resistor for rapid fault de-excitation
- Auxiliary parts: Auxiliary power supply, temperature detection and fan interlock components
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