ABB PROTECTION RELAY RXTCS 1MYN569698 E 12:31

The RXTCS is part of ABB’s renowned Relion® product family and belongs to the RET615 series, which is specifically engineered for feeder and transformer protection. The code 1MYN569698 E is a specific order code that defines the exact hardware configuration, firmware, and set of protection functions included with this particular unit.

In essence, this relay is a compact, multifunctional device that replaces several older electromechanical or single-function relays with a single, intelligent unit. It serves as the “brain” for an electrical circuit, continuously monitoring current and voltage to detect faults and automatically isolate the faulty section to protect personnel and equipment.

Key Features and Capabilities

1. Comprehensive Protection Functions:

   • Overcurrent Protection (50/51, 50N/51N): The core function. It protects against phase-to-phase and phase-to-ground faults (short-circuits) with highly customizable time-current characteristics (e.g., DT, IDMT).

   • Directional Overcurrent Protection (67/67N): Essential for ring main or parallel feeder systems. It can determine the direction of a fault current, allowing it to trip only for faults on its protected line, not for faults behind it.

   • Transformer Protection:

     • Restricted Earth Fault (64R): A highly sensitive protection for detecting internal ground faults within a transformer’s winding.

     • Inrush Detector (THD): Recognizes the high harmonic content of transformer inrush current and blocks unnecessary tripping during transformer energization.

   • Autorecloser (79): Automatically attempts to re-close the circuit breaker after a temporary fault (e.g., a tree branch causing a short circuit that burns away). This significantly improves power supply availability.

   • Thermal Overload Protection (49): Protects cables and transformers from damage due to sustained overcurrent conditions by modeling the thermal capacity.

2. Control and Automation:

   • Programmable Logic (CFC): Contains Configurable Function Charts (CFC). This is a powerful, graphical tool that allows engineers to create custom control sequences, interlocking, and automation schemes without needing specialized software languages.

   • Circuit Breaker Control: Provides full control (open/close) and monitoring of the circuit breaker.

   • Measurement: Provides accurate, real-time values for currents, voltages, power, energy, frequency, and harmonics.

3. Communication and Interfacing:

   • Communication Protocols: Typically supports industry-standard protocols like IEC 61850 (for modern digital substations), IEC 60870-5-103, and Modbus for seamless integration into SCADA and control systems.

   • HMI Interface: Features a large, backlit graphical LCD display and a keypad for local access to measurements, event logs, and settings.

   • LED Indicators: Provides quick visual status and alarm indications.

4. Monitoring and Diagnostics:

   • Event Recorder: Logs time-stamped sequences of events (e.g., trips, alarms, status changes) for precise post-fault analysis.

   • Disturbance Recorder: Captures high-resolution current and voltage waveforms during a fault, which is crucial for understanding the nature of the disturbance.

   • Condition Monitoring: Monards the health of the circuit breaker by tracking operations and trip times.

Typical Applications

The RET615 (RXTCS) is ideally suited for protecting and controlling:

• Distribution Feeders in utility and industrial networks.

• Ring Main Units (RMUs).

• Transformers (primarily for secondary and backup protection).

• Sectionalizers in meshed distribution systems.

• Industrial and Commercial Power Systems.