The series resonance under Wuhan UHV can help many power workers conduct various power tests more conveniently.

The operating frequency of a series resonant reactor mainly depends on its design and application environment, but generally speaking, its operating frequency range is wide. The following is a detailed explanation of the operating frequency of series resonant reactors:

Frequency range:

According to different standards and applications, the operating frequency of series resonant reactors can be roughly divided into several ranges.

The first frequency range typically includes 30-300Hz, 20-300Hz, and 1-300Hz, which cover a wide range of frequency variations.

The second frequency range is the power frequency range, usually 45-65Hz or 45-55Hz, which is specified for specific power system standards (such as IEC standards).

The third frequency range is close to the power frequency of 35-75Hz, which is considered to be closer to the operating voltage frequency (such as 50Hz).

International standard recommendations:

The "Test Guidelines" released by the 21st and 9th working groups of the International Conference on Power Grids recommend a frequency range of 30-300Hz.

The draft standards of IEC60840 and IEC62067 (2001 and 2000) stipulate that the frequency range of 20-300Hz can be used.

Considerations in practical applications:

In practical applications, the selection of frequency may vary depending on specific experimental purposes, equipment characteristics, and system requirements.

Lower frequencies may allow for longer cable lengths or larger capacitance, but may result in an increase in the size and weight of the reactor core.

Although higher frequencies may reduce the losses of series harmonic reactors and excitation transformers, it is necessary to consider the polarization heating problem of the tested capacitor dielectric.

Special frequency applications:

In some special cases, such as series resonant reactors designed by some foreign manufacturers, lower operating frequencies such as 25Hz or 20Hz may be used.

Some studies also suggest that even if the frequency is lower than the typically recommended minimum value (such as less than 20Hz or even up to 0.1Hz), it may still have equivalence to power frequency AC testing.

Summary:

The working frequency range of series resonant reactors is wide, and can be selected according to specific application environments and requirements.

When selecting the operating frequency, it is necessary to comprehensively consider factors such as equipment performance, system requirements, and the purpose of the experiment.

At the same time, attention should also be paid to the matching problem between frequency and device characteristics or system requirements that may occur in practical applications.