ALSTOM P70035W82V Feeder Protection Relay

Overview

The P70035W82V continuously measures three-phase currents and residual current. It offers both definite time and inverse time overcurrent characteristics (IEC and ANSI curves). The directional overcurrent element can be set to forward or reverse direction, enabling selective fault clearance in meshed networks. Additional functions include overvoltage/undervoltage protection, underfrequency, and a multi-shot autoreclose for overhead lines. The relay features a user-friendly interface with a graphical LCD and keypad, simplifying local operation and settings review.

Key Features

• Protection Functions: 50/51 (phase overcurrent), 50N/51N (earth fault), 67 (directional overcurrent), 27/59 (voltage), 81 (frequency), 79 (autoreclose).

• Measurement: True RMS currents, demand current, fault current recording.

• Programmable Logic: Configurable logic gates for custom interlocking and control.

• User Interface: 128x64 graphical LCD, multi-language, and 6 navigation keys.

• Communication: RS485 with Modbus RTU, optional IEC 61850 or Profibus.

• Digital I/O: 6 digital inputs, 4 output relays (expandable via I/O modules).

• Event & Fault Records: 200 events, 10 fault records with oscillography.

• Self-Supervision: Continuous internal diagnostics with watchdog output.

Technical Specifications

• Nominal Current: 1 A or 5 A (CT inputs).

• Auxiliary Supply: 24-250 VDC / 100-240 VAC.

• Current Inputs: 0-20 A continuous, 100 A for 1 s.

• Voltage Inputs: 0-150 VAC (optional for voltage protection).

• Frequency Range: 50/60 Hz auto-sensing.

• Overcurrent Accuracy: ±2% of setting.

• Directional Accuracy: ±2° at nominal current.

• Output Contacts: 4 form-C, 8A / 250 VAC.

• Operating Temperature: -25°C to +70°C.

• Enclosure: Panel mount, 96 x 96 mm (¼ DIN).

• Certifications: IEC 60255, CE, UL.

Applications

The P70035W82V is ideal for protecting medium voltage feeders in utility and industrial networks:

• Radial distribution feeders.

• Loop or ring main feeders (directional protection).

• Transformer primary and secondary protection.

• Industrial plant incomers and bus-ties.

• Overhead lines with auto-reclosing.

Configuration and Integration

The relay can be fully configured using the front panel keypad or via ALSTOM's software. Multiple setting groups allow adaptation to different operating conditions (e.g., normal and emergency). The directional element can use voltage polarizing or current polarizing. The autoreclose function supports up to 4 shots with programmable dead times. Integration with SCADA is straightforward through Modbus RTU or optional protocols. The relay's compact size and comprehensive protection make it a cost-effective choice for modern distribution networks.

In summary, the ALSTOM P70035W82V feeder protection relay delivers advanced protection functions in a compact package, enhancing network reliability and selectivity.