Basler Electric KR2F Generator Voltage Regulator

The Basler Electric KR2F (part number 9056600100) is a compact, solid‑state automatic voltage regulator (AVR) designed for synchronous generators in standby, prime power, and mobile applications. It senses the generator output voltage and controls the excitation current to maintain the terminal voltage within ±1% of the setpoint under steady‑state conditions. The KR2F is suitable for both brushless and DC exciter systems, offering versatility for a wide range of generator sizes.

Control and Adjustment

The regulator features a proportional‑integral (PI) control loop with adjustable stability to match the generator and exciter dynamics. A front‑panel potentiometer allows voltage setpoint adjustment from 90% to 110% of nominal. An under‑frequency roll‑off function reduces excitation when the frequency drops below 45 Hz, preventing over‑excitation and protecting the generator. The regulator also includes a droop adjustment (0‑5%) for reactive load sharing in parallel operation.

Input and Output

Sensing input: 100‑480 VAC, 50/60 Hz, single‑phase or three‑phase. The regulator derives its power from the sensing input, eliminating the need for a separate power supply. Excitation output: up to 90 VDC at 5 A continuous, sufficient for most small to medium exciters. Output is short‑circuit protected and current‑limited. A field current monitor terminal is provided for external metering.

Protection Features

Built‑in protections include loss of sensing (shuts down excitation), over‑excitation limit, thermal shutdown, and reverse polarity protection on field output. A red LED indicates fault conditions, and a green LED confirms normal operation. The regulator automatically resets after faults are cleared. An auxiliary output provides a signal for remote alarm.

Technical Specifications

Operating temperature: –20°C to +60°C. Regulation accuracy: ±1%. Response time:<50 ms for 20% load change. Burden: <5 VA. Enclosure: rugged plastic or metal (depending on variant), suitable for panel or chassis mounting. Weight: approximately 1.5 kg. Compliance with CE and RoHS standards.

Applications

The KR2F is used on diesel, gas, and hydro generator sets from 10 kVA to 500 kVA. It is ideal for agricultural irrigation, construction sites, marine auxiliary power, and telecommunications backup. Its simple design makes it a popular choice for OEMs and retrofits.

Installation and Commissioning

Mount the regulator near the generator terminal box. Connect sensing leads, field output, and optional droop CT leads. Commissioning involves setting the voltage setpoint, stability, and droop while performing load tests. The regulator includes a test mode for checking excitation without running the generator.

Reliability and Quality

Basler Electric’s KR2F is built with high‑grade components and conformal‑coated boards for moisture and dust resistance. It is tested for vibration, thermal cycling, and surge immunity. The regulator has a proven MTBF of over 80,000 hours.

Conclusion

The Basler Electric KR2F generator voltage regulator (9056600100) is a dependable, cost‑effective solution for precise voltage regulation in small to medium generator sets. Its robust design and flexible settings ensure stable performance in demanding environments.