Description
The ABB UNS3020 is a rotor earth fault relay that is part of the Unitrol series of protection relays. It is designed to protect synchronous generators and motors from earth faults in the rotor winding. The UNS3020 is a microprocessor-based relay that offers a variety of features, including:
- High sensitivity: The UNS3020 can detect earth faults as low as 0.1 A.
- Fast operating time: The UNS3020 has a fast operating time of less than 20 ms, which helps to minimize damage to the rotor winding.
- Multiple tripping options: The UNS3020 offers a variety of tripping options, including definite time, inverse time, and restricted earth fault (REF) protection.
- Communication capabilities: The UNS3020 can communicate with SCADA systems via Modbus RTU or Profibus DP protocols.
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Here are some of the specifications of the ABB UNS3020:
- Rated voltage: 3.6 kV to 15 kV
- Rated current: 5 A to 5000 A
- Operating time: Less than 20 ms
- Protection characteristics: Definite time, inverse time, REF
- Communication protocols: Modbus RTU, Profibus DP
Here are some of the applications of the ABB UNS3020:
- Protection of synchronous generators: The UNS3020 can be used to protect synchronous generators from earth faults in the rotor winding.
- Protection of synchronous motors: The UNS3020 can be used to protect synchronous motors from earth faults in the rotor winding.
- Industrial applications: The UNS3020 is commonly used in industrial applications, such as power plants, paper mills, and steel mills.
