TMEICA ARND-3119 A6 2N3A3119-B

Description

Technical Specifications:

• Model: ARND-3119
• Variant: A6 / 2N3A3119-B
• Type: Fully redundant digital AVR — Automatic Voltage Regulator
• Application: Critical brushless excitation, large synchronous generators (100 MVA and above)
• Redundancy: Dual independent channels with automatic transfer, hot-standby
• Input Signals: 2× PT voltage, 2× CT current, 2× frequency, start/stop, PSS, load compensator
• Output: 2 independent sets of firing pulses (6-pulse or 12-pulse each)
• Voltage Regulation Accuracy: ±0.1% (steady state) — highest in ARND series
• Response Time: < 5 ms (fastest in ARND series)
• Firing Angle Resolution: 0.05°
• Communication: Ethernet TCP/IP (dual ports), RS-485, IEC 61850 MMS, DNP3.0, Modbus TCP
• Remote Setpoint: Dual 4–20 mA inputs (one per channel)
• Power Supply: Dual power supply inputs (110 VAC + 24 VDC) for maximum redundancy
• Operating Temperature: -25°C to +60°C
• Protection Functions: OEL, UEL, SCL, V/Hz limiter, stator thermal protection, rotor ground fault detection
• Event Log: 500 events with millisecond timestamps
• Dimensions: Full DIN or 1/4 DIN with extended depth
• Weight: Approximately 2.5 kg
• Compliance: IEC 60034, IEEE 421.5, IEC 61850, IEC 61508 SIL 2

Functional Features:

• Full dual-redundancy: both channels process all inputs independently
• Automatic channel transfer on fault detection (< 10 ms switchover)
• IEC 61850 GOOSE messaging for fast trip signals
• Built-in oscillography: captures voltage/current waveforms during faults
• Black-start capability: can build voltage from residual magnetism
• Automatic initialization sequence with soft voltage buildup
• Web server for configuration via any browser
• SNMP v3 support for network management

Structural Characteristics:

• Enclosure: Die-cast aluminum, IP54 rating (dust and splash proof)
• Terminals: Double-level spring-clamp terminals
• Display: 128×64 pixel graphic LCD, full color (on some sub-variants)
• Status: 8 LED indicators + LCD message display
• PCB: 6-layer, gold-plated contacts, conformal coated, potted for vibration resistance

Working Principle: Two completely independent AVR channels operate in parallel. Each channel has its own PT, CT, processor, and firing pulse output. The channels continuously compare their output voltages. If one channel deviates beyond a threshold or fails self-diagnostics, the other channel takes over within one power cycle (< 16.7 ms at 60 Hz). The IEC 61850 interface publishes generator status as logical nodes (MMXU, MHAI, STPI) to the substation automation system. The oscillography function stores pre-fault and fault waveforms in non-volatile memory for post-event analysis.

Advantages:

• Highest availability architecture — dual everything (power, inputs, outputs, processing)
• IEC 61850 native — seamless integration with modern substation automation
• Fastest response time in the product line — critical for grid stability
• Oscillography eliminates need for separate fault recorder
• SIL 2 certified for safety-critical applications

Applicable Industries: Large power plants (500 MW+), pumped storage hydro, nuclear plant auxiliary generators, critical industrial cogeneration, grid-forming inverters with synchronous generator emulation

Installation Requirements:

• Dual PT circuits: two separate potential transformer secondaries, each wired to both channels (cross-connected for redundancy)
• Dual CT circuits: two separate current transformer secondaries
• Dual Ethernet: two separate network paths to different switches (ring topology)
• Dual power: two separate power feeds (AC + DC)
• Ground impedance: < 0.25 Ohm
• Firing pulse cables: shielded twisted pair, max 30 m per channel

Usage Precautions:

• Commission both channels fully before placing in service — do not use single-channel mode in critical applications
• Verify IEC 61850 configuration with substation engineer before energizing
• Firmware updates: use USB or Ethernet — never update via RS-485
• Oscillography memory: 500 events — configure auto-purge to prevent overflow
• Annual full functional test including channel transfer test mandatory