Basler VR63-4C/UL Voltage Regulator

Basler VR63-4C/UL Voltage Regulator: Technical Depth Analysis and Engineering Application

Product positioning and technical overview

VR63-4C/UL is a single-phase input, DC output voltage regulator suitable for small and medium-sized synchronous generator sets equipped with brushless excitation systems. Its design goal is to provide stable and precise terminal voltage control for generators in a wide temperature range (-40 ° C to+60 ° C) and harsh vibration environments.

Core functional highlights:

Frequency Compensation: Suppresses premature voltage recovery during sudden load increases and assists the prime mover in smoothly receiving loads.

Overexcitation Shutdown: Monitor the excitation voltage, automatically cut off the output when abnormal high excitation is detected, and protect the excitation winding.

Solid state excitation circuit: It can achieve reliable voltage building when the residual magnetism of the generator is as low as 6 Vac.

Built in EMI filter: meets industrial electromagnetic compatibility requirements.

The product has passed UL 6200:2019 certification and CSA certification, and is suitable for industrial power generation applications in North America and international markets.

In depth interpretation of technical specifications

1. DC output capability

Parameter values

Maximum continuous output 4 Adc @ 63 Vdc (252W)

One minute strong excitation output 7 Adc @ 100 Vdc (700W, input 120Vac)

The output capability determines the adaptation range of the matching excitation winding. The manual specifies that the DC resistance of the excitation winding must be between 15 Ω and 100 Ω. If the resistance is lower than 15 Ω, a current limiting resistor must be connected in series to avoid output overload; If it is higher than 100 Ω, sufficient excitation current may not be provided.

2. Communication input and detection

Power input: 85-139 Vac, single-phase, 50/60Hz ± 5%, maximum capacity 450VA

Voltage detection: Shared terminals with power input (terminals 3 and 4), with a detection range of 85-139 Vac

Voltage regulation range: 85-139 Vac (corresponding to the generator terminal voltage setting range)

Important engineering reminder: The power input and detection input share the same terminal, which means that the control power of the regulator is taken from the generator terminal voltage or auxiliary winding. The advantage of this self powered design is that it does not require an independent external power source, but the disadvantage is that when the voltage at the generator terminal drops severely, the regulator may lose control due to insufficient power supply.

3. Adjust accuracy and response speed

Steady state accuracy: better than ± 1.0% within the range of no load to full load

Response time: When detecting a ± 5% step change in voltage, the response time is less than 1.5 power frequency cycles (i.e.<25ms @ 60Hz)

4. Overexcitation shutdown characteristics

Overexcitation shutdown is the core safety function that distinguishes VR63-4C/UL from ordinary AVR. The action logic is:

When the excitation voltage exceeds 95 Vdc ± 5 Vdc, the shutdown delay is inversely proportional to the overvoltage amplitude (the higher the voltage, the faster the action).

When the excitation voltage exceeds 140 Vdc ± 5 Vdc, the excitation output is forcibly cut off within 0.2 seconds.

After shutdown, the input voltage needs to be reduced to below 6 Vac (if the power is turned off for at least 2 seconds) before resetting.

This feature can effectively prevent rotor winding overheating and damage in the event of excitation circuit failure or regulator loss of control.

5. Environmental and physical specifications

Working temperature: -40 ° C to+60 ° C, storage temperature: -65 ° C to+85 ° C

Vibration tolerance: 5-26Hz/1.2g, 27-52Hz/0.036 "dual amplitude, 53-1000Hz/5g

Impact tolerance: 20g (three-axis)

Weight: Only 283g (10 oz), lightweight design, can be directly installed in the generator control box.

Frequency compensation mechanism and tuning method

The frequency compensation function aims to improve the dynamic response of the generator when there is a sudden increase in load. When the load suddenly increases, the speed of the prime mover will briefly decrease, and the frequency of the generator will also decrease accordingly. If there is no frequency compensation, the AVR will fully maintain the voltage setting value, which may cause the prime mover to overload or even stall.

The frequency compensation characteristic curve of VR63-4C/UL is shown in Figure 3 (manual):

When the frequency is higher than the inflection point frequency, the regulator works normally and maintains the set voltage.

When the frequency drops below the inflection point frequency, the voltage setting value linearly decreases at a fixed slope to assist the prime mover in restoring speed.

The factory preset inflection point frequency is 45Hz (50Hz system).

On site frequency adjustment operation:

If used in a 60Hz system, the inflection point frequency needs to be adjusted to 55Hz.

Operation method: Cut off the external HZ jumper and wrap the cut ends with insulation to ensure that they are not exposed.