Basler Electric BE1‑11g – Generator Protection Relay (G5A3M2J2N0E000)

The Basler Electric BE1‑11g is a comprehensive generator protection relay that provides complete protection for synchronous generators in utility, industrial, and commercial applications. This model, configured as G5A3M2J2N0E000, integrates multiple protection elements, metering, and communication in a single compact unit, reducing panel space and simplifying system design. The BE1‑11g is specifically optimized for generator protection, offering a wide range of functions including differential, loss‑of‑field, reverse power, and overexcitation protection.

Protection Elements

The BE1‑11g includes the following key protection functions:

• Percentage Differential (87G) – Provides high‑speed protection for internal phase and ground faults.

• Loss‑of‑Field (40) – Detects excitation failure using impedance measurement.

• Reverse Power (32) – Prevents motoring of the generator.

• Overexcitation (24) – V/Hz protection to prevent core saturation.

• Stator Overcurrent (50/51) – Instantaneous and time‑overcurrent protection.

• Voltage Protection (59/27) – Overvoltage and undervoltage.

• Frequency Protection (81O/U) – Overfrequency and underfrequency.

• Negative Sequence (46) – For unbalanced load protection.

All elements are independently configurable and can be enabled or disabled as required.

Measurement and Metering

The relay provides high‑accuracy measurement of three‑phase voltage, current, power (kW, kVAR, kVA), power factor, frequency, and energy. All values are displayed on the front‑panel LCD and can be accessed via communication. The unit includes a built‑in oscillography feature that captures up to 64 cycles of waveform data for fault analysis.

Setting and Configuration

Settings are entered via a front‑panel keypad and backlit LCD, or through the BESTCOMS software. Up to six setting groups are available, allowing the relay to adapt to different operating conditions. The unit includes a password‑protected lock to prevent unauthorized changes.

Communication and Integration

Standard RS‑485 port with Modbus RTU and DNP3 protocols is provided. Optional Ethernet supports Modbus TCP and IEC 61850 for advanced substation integration. The relay includes IRIG‑B input for time synchronization.

Environmental and Mechanical

Housed in a rugged metal case for panel or 19‑inch rack mounting, the BE1‑11g operates from -40 °C to +85 °C and is rated IP40. The relay meets IEC 60255, IEEE C37.2, and ANSI C37.90 standards.

Typical Applications

This relay is used for protection of medium to large synchronous generators in thermal, hydro, and gas‑fired plants, as well as industrial gensets and co‑generation facilities.

Maintenance and Diagnostics

Continuous self‑diagnostics monitor hardware and software integrity. The relay logs events and provides diagnostic codes for troubleshooting.

In summary, the Basler Electric BE1‑11g offers a comprehensive, reliable, and flexible generator protection solution.