EI803F ABB distributed control system industrial DCS module card

Description

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The overcurrent protection for AC installations uses three types of electronic trip unit series:
PR121, PR122 and PR123.
The basic series, PR121, offers the whole set of standard protection functions, complete with a
user-friendly interface.
It allows discrimination of which fault caused the trip by means of the new led indications.
PR122 and PR123 trip units are of new concept modular architecture. It is now possible to have
a complete series of protections, accurate measurements, signalling or dialogue functions, designed and customisable for all application requirements.
The protection system is made up of:
• 3 or 4 new generation current sensors (Rogowsky coil);
• external current sensors (i.e. for external neutral, residual current or source ground return
protection);
• a protection unit selected among PR121/P, PR122/P or PR123/P with optional communication
module via Modbus or Fieldbus plug network (PR122/P and PR123/P only), as well as via a
wireless connection;
• an opening solenoid, which acts directly on the circuit-breaker operating mechanism (supplied with the protection unit).

General specifications of the electronic trip units include:
• operation without the need for an external power supply
• microprocessor technology
• high precision
• sensitivity to the true R.M.S. value of the current
• trip cause indication and trip data recording
• interchangeability among all types of trip units
• setting for neutral configurable:
– OFF-50%-100%-200% of phase setting for circuit-breakers E1, E2, E3 and E4/f,
E6/f full-size versions, and E4-E6 with external neutral protection;
– OFF-50% for standard E4 and E6.
The main performance features of the trip units are listed below.