The GE Multilin F650 (F650BABF2G1HI) is a high-performance digital bay controller from GE Vernova, designed for power systems. It integrates feeder protection, measurement, control, and communication, and is a core component of substation automation and industrial power distribution systems.

I. Model Designation (F650BABF2G1HI)

This model code precisely defines the hardware configuration:

F650: Series Name (Feeder Protection and Interval Controller)

B: Basic Display

A: Serial Port 1 — Redundant RS485

B: Ethernet 2 — 10/100 Base TX

F: No Additional Communication Module

2: I/O Slot F — 8 DI + 8 DO + 2 Trip/Close Circuit Monitoring

G: Additional Communication Module

1: I/O Slot G — 16 DI + 8 DO

HI: Auxiliary Power Supply — 110–250 VDC / 120–230 VAC Wide Voltage

II. Core Functions

1. Comprehensive Protection Functions

Overcurrent Protection: Time-definite / Inverse-time, Instantaneous, Directional Elements (Phase / Neutral / Ground / Sensitive Grounding)

Voltage / Frequency: Over / Undervoltage, Over / 1. **Underfrequency Protection (Level 6), df/dt Frequency Change Rate Protection**

**Advanced Functions:** 2nd Harmonic Blocking, Load Intrusion Monitoring, Synchronization Detection, Circuit Breaker Failure, 4-Time Automatic Reclosing

2. **Measurement and Monitoring:**

**Precise Measurement:** Current, Voltage, Power, Power Factor, Frequency, Harmonics

**Event Logging, Fault Recording, SOE Events, Data Logging**

**Circuit Breaker Control, Trip and Close Circuit Monitoring, Anti-Pump Logic**

3. **Communication and Protocol:**

**Ethernet:** IEC 61850 Ed. 2 (KEMA Certified), Modbus TCP, DNP3.0, IEEE 1588 PTP Time Synchronization

**Serial Port:** RS485 (Modbus RTU, DNP3.0, IEC 103)

**High Availability Network:** Supports PRP, HSR, RSTP Redundancy Protocols

4. **I/O Configuration (This Model):**

**Digital Inputs (DI):** 24 channels (optically isolated)

**Digital Outputs (DO):** 16 Circuit (relay output, 5A/250V)

Dedicated circuit: 2 sets of trip/close monitoring circuits

III. Technical Parameters

Operating Power Supply: 110–250 VDC (88–300V) / 120–230 VAC (96–250V)

Power Consumption: Approx. 30W

Environment: Operating temperature -25°C ~ +70°C, humidity 5–95% (non-condensing)

Dimensions: 144mm (H) x 178mm (W) x 254mm (D), 19-inch rack mounting

Weight: Approx. 1.5–5 kg

IV. Typical Applications

Substation bay level control (circuit breakers, disconnectors, grounding switches)

Industrial/municipal power distribution feeder protection

Power supply automatic transfer, load shedding, busbar interconnection solutions

Distributed renewable energy (DG) grid-connected protection (including anti-islanding)

V. Main Advantages

Integration: Integrated protection, control, measurement, and communication, reducing secondary wiring.

High reliability: Industrial-grade design, dual-network redundancy, IEC 61850 standard compatibility.

Flexible programmability: Programmable logic controller (PLC), virtual I/O, custom protection curves.

Easy maintenance: Graphical LCD, pluggable modules, USB configuration, event analysis.

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