ALSTOM / GE MICOM P346 GENERATOR PROTECTION NUMERICAL RELAY

The MiCOM Alstom  P346 generator protection relay have been designed for the protection of a wide range of generators.

The Alstom P346 is suitable for the protection of medium to large size generators and is the same as the P343 but without 100% stator earth fault, pole slipping and dead machine protection.

The P346 also includes 10 function keys for integral scheme or operator control functionality and tri-color (red/yellow/green) LEDs. Rotor earth fault protection is provided by the P391 low frequency square wave injection, coupling and measurement unit connected to the rotor circuit. The measurement of the rotor resistance is passed to the P346 via a current loop output (0-20 mA) on the P391 connected to one of the 4 current loop inputs on
the P346. The rotor ground fault protection is only available if the relay includes the CLIO hardware option.

The Micom P346 supports the following relay management functions in addition to the functions shown above.

• Measurement of all instantaneous & integrated values
• Circuit breaker control, status & condition monitoring
• Trip circuit and coil supervision
• 4 Alternative setting groups
• Programmable function keys (P343/4/5/6)
• Control inputs
• Programmable scheme logic
• Programmable allocation of digital inputs and outputs
• Sequence of event recording
• Comprehensive disturbance recording (waveform capture)
• Fault recording
• Fully customizable menu texts
• Multi-level password protection
• Power-up diagnostics and continuous self-monitoring of relay
• Commissioning test facilities
• Real time clock/time synchronization – time synchronization possible from IRIG-B input, opto input or communications

GE’s Agile P346 generator protection solutions provide extensive functionality to meet all generator and generator – transformer applications, including differential protection for fast and selective tripping of phase and earth faults. All generator protection, control, monitoring, recording and communications components are housed within one box, and the solutions are accompanied by a comprehensive library of hardware options, protection and control functions to meet system requirements.

Key benefits:

• Extensive condition based monitoring features for generators and transformers
• Graphical programmable scheme logic eases protection scheme creation and avoids the need for external logic controllers
• Range of different protocols (MODBUS, DNP3, IEC 60870-5-103 and IEC 61850) are available
• IEC 61850 / DNP3.0 redundant Ethernet, supporting self healing ring, RSTP, dual homing or PRP
• Programmable curves for easy protection customization

Main characteristics:

• Sensitive rotor earth fault protection using low frequency injection method
• Harsh Environment Option to protect against corrosive gases such as H2S or SO2
• Generator and transformer thermal overload, transformer loss of life and through fault monitoring
• Extensive protection for large machines such as pole slipping and 100% stator earth fault protection (3rd harmonic and low frequency injection method)

TYPE: NUMERICAL RELAY

• Protection Type: Generator

• Voltage 24V-240V

• AC\DC Operated: Auxillary supply AC/DC

MiCOM ALSTOM is a comprehensive solution capable of meeting all electricity supply requirements. It comprises a range of components, systems and services from Alstom Grid. Central to the MiCOM ALSTOM concept is flexibility. MiCOM ALSTOM provides the ability to define an application solution and, through extensive communication capabilities, integrate it with your power supply control system.

Our products include extensive facilities for recording information on the state and behavior of the power system using disturbance and fault records. They can also provide measurements of the system at regular intervals to a control center enabling remote monitoring and control to take place. For up-to-date information on any MiCOM ALSTOM product, visit us!