ABB UNITROL®6000 excitation systems
ABB UNITROL®6000 excitation systems
DESCRIPTION
ABB UNITROL® excitation systems are a key component in many power generating units used by plant owners and operators to achieve reliability of operations, stability, and fast transient response of their assets, as per grid requirements.
The UNITROL® 6000 excitation systems series is specifically designed to serve a wide range of applications:
• Generators: steam, gas, nuclear and hydro power plants, nuclear emergency diesel
• Motors: steel mills, pulp and paper, chemical, natural gas production plants, refineries
UNITROL® 6000 for indirect and static excitation systems comes in the following versions:
• UNITROL® 6000 Medium
• UNITROL® 6000 X-power
Selected applications
• Hydro power plant
• Pumped storage power plant
• Combined cycle power plant
• Critical Steam power plant with brushless excitation, Ifn 200 A, 400 Hz supply
Engineered solutions:
• Online supply transfer
• Electric braking
Selected applications
• Nuclear power plant, field current Ifn >10,000 A
• Underground hydro power plant, Ifn 4,500 A, with redundant air-to-water heat exchanger system
• Gas turbine power plant, MEGATROL package with Ifn 6,000 A and static frequency converter 15 MW for turbine starting
• Coal-fired power plant, Ifn 3,500 A, power part in IP54 container, detached AVR cabinet with >150 m distance apart
• Hydro power plant, Ifn 4,000 A, two DC field circuit breakers, one for DC backup excitation
Closed-loop control
• Voltage regulator with PID filter (AUTO mode)
• Field current regulator with PI filter (MAN mode)
• Reactive and/or active current droop compensation
• Limiter circuits to ensure that the generator operates within safe limits: - Maximum and minimum field current - Maximum stator current, dependent on machine cooling media temperature - P/Q under-excitation - Volt/Hertz
• Manual restrict to keep the generator within safe limits, even though controlled in manual mode
• Power factor/reactive load control
• Power system stabilizer
Protection and monitoring functions
• Monitoring and protection functions can be freely configured on three action levels:
- Alarm signal only
- Changeover to redundant circuits
- Instantaneous excitation trip to protect the assets
Major available functions
• Overcurrent protection (instantaneous/inverse time)
• Volt/Hertz protection
• Loss of field protection
• Rotor temperature
• Thyristor conduction monitoring
• Actual value monitoring
Power system stabilizer (PSS)
The PSS function improves the stability of the generator and the transmission system by using the excitation to damp power oscillations.
PSS types optionally available for UNITROL® 6000:
• PSS 2A/2B/2C in accordance with IEEE standard 421.5-2016
• PSS 4B/4C in accordance with IEEE standard 421.5-2016
• Adaptive PSS (APSS) developed by ABB Switzerland, which optimizes the PSS settings based on the current network conditions, to maximize availability and avoid trips due to insufficient damping in weak networks
Main features (UNL14300)
• AC supply voltage up to 1,500 V
• High insulation test voltages up to 7.5 kV
• Low noise level of cooling fans ≤70 dB(A)
• Active current balance control
• Optional: - Redundant fans, replaceable during operation
- “Draw-out” design for safe online repair and function tests
- User name Member Level Quantity Specification Purchase Date
- Satisfaction ：
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