Basler BE2000E Voltage Regulator: Replacement and Application Details

Resolution: 0.001

3.4 VAR (reactive power) regulation mode

This mode directly controls the reactive power output of the generator.

Adjustment range: -100% to+100%

Resolution: 0.1%

Protection functions and security mechanisms

BE2000E integrates comprehensive protection functions to ensure the safety of the generator and regulator under various abnormal operating conditions:

Protection function triggering condition response characteristics

Overexcitation shutdown magnetic field current exceeds the adjustable set value, with a delay of 0-10 seconds

Generator overvoltage shutdown voltage>set value 105-120% fixed 0.75 second delay

Over excitation limit (OEL) automatic current limiting in AVR/var/PF mode

Loss of excitation, shutdown of generator, loss of sensing, instantaneous movement

Over temperature shutdown, internal temperature exceeding transient action

Crowbar protects against magnetic field anomalies, overvoltage, transient short circuit, and magnetic fields

4.1 Magnetic field overvoltage protection

Setting range: 0-250 Vdc

Time delay: 15 seconds (fixed)

When the magnetic field voltage continues to exceed the set value for 15 seconds, the regulator will turn off the excitation output to prevent damage to the excitation machine and generator magnetic field coils due to overvoltage.

4.2 Magnetic field overcurrent protection

Setting range: 0-7.5 Adc

Resolution: 0.001 Adc

Time delay: adjustable from 0-10 seconds (step size of 1 second)

This protection is particularly important: when the overexcitation limit (OEL) cannot control the current within a safe range, overcurrent protection serves as the last line of defense to cut off the excitation. The adjustability of time delay allows for coordination and coordination with OEL characteristics.

4.3 Generator Overvoltage Protection

Setting range: 105% -120% of the set value

Resolution: 1%

Time delay: 0.75 seconds (fixed)

This protection is used to prevent generator overvoltage caused by regulator failure or abnormal sensing circuit, and to protect downstream load equipment.

4.4 Loss of Sensing Protection

When the voltage sensing signal of the generator is lost, BE2000E will automatically turn off the excitation output to prevent regulator misoperation caused by incorrect sensing signals. This is particularly important for three-phase sensing mode - any loss of phase will trigger protection.

4.5 Crowbar Circuit

The Crowbar circuit is a critical safety feature of the BE2000E. When overvoltage is detected in the magnetic field, the Crowbar circuit will quickly provide a low impedance path to discharge the magnetic field energy to a safe level, protecting the magnetic field winding and exciter from destructive overvoltage impact.

Parallel operation and compensation function

BE2000E supports reactive power distribution during parallel operation of generator sets and provides two compensation modes:

5.1 Reactive Droop Compensation

Adjustment range: 0-10%

Resolution: 0.01%

When operating in parallel with independent generator sets or with the grid, droop compensation allows the generator to share the reactive load according to its capacity ratio. The larger the droop coefficient setting, the more significant the impact of changes in reactive load on terminal voltage.

Typical setting: Typically set at 3-5%, depending on the capacity of the generator set and system requirements.

5.2 Reactive Differential/Cross Current Compensation

This mode (also known as cross current compensation) achieves more accurate reactive power distribution by comparing the differences in reactive current between parallel generators. Compared to simple droop compensation, differential compensation can provide more stable voltage regulation when the load changes significantly.

Attention: If an external resistor is added to the CT circuit, the capacity may exceed 1 VA and should be considered during design.

Underfrequency compensation and engine unloading

BE2000E has built-in underfrequency (Volts/Hertz) compensation function, which automatically reduces the output voltage when the generator speed decreases, preventing the excitation system from attempting to maintain the rated voltage and causing overexcitation.

Characteristic slope: adjustable from 1 to 3 PU, step size 0.01

Frequency range: 40-65 Hz

Resolution: 0.01 Hz

In addition, this function can also be used to achieve "engine unloading": when the grid frequency decreases, by reducing the active power output of the generator, it helps the prime mover (engine or turbine) restore its rated speed. This is particularly important in isolated power grids or ship power systems.

Interface and Communication

7.1 Contact Input

BE2000E provides 4 contact inputs for interfacing with external control systems:

Input function terminal

Parallel control unit/parallel selection 52L, 52M

The boost setting value increases by 6U, 7

The voltage reduction setting is reduced by 6D, 7

Var/PF enables reactive power/power factor mode switching 52J, 52K

All contact inputs use a dry contact polling voltage of 13 Vdc, which is compatible with most standard control signals.

7.2 General alarm output

Type: Type A (normally open)

Rated load: 7 Aac/7 Adc continuous