FDS-PDC dielectric frequency response analyzer

Test principle
DRA-3000 dielectric response analyzer can use either the polarization depolarization PDC method or the frequency domain FDS method alone, or both methods can be used at the same time. The PDC curve can be converted into a low-frequency FDS curve through a unique algorithm, and the high-frequency measured FDS curve can form a full-range FDS curve. This allows users to measure the equipment in a relatively short time in a wide frequency range, greatly reducing the workload of on-site testing personnel and improving on-site work efficiency.

1.PDC method
Polarization-depolarization current (PDC)method is a time-domain measurement method for dielectric response. It uses the polarization characteristics of dielectric materials under DC voltage to obtain PDC curves, and studies the relationship between PDC curve changes and aging/water content. The principle of polarization/depolarization current method: When a DC voltage is applied to an insulating dielectric, polarization occurs inside the dielectric, and the internal dipoles are arranged in a directional manner to form a polarization current; After removing the DC voltage and shorting the two electrodes, the polarized charges gradually change from a directional arrangement to a disordered state, generating a depolarizing current.

2.FDS method
Frequency domain spectroscopy (FDS) method is to study the polarization characteristics of a medium in the frequency domain, also known as the frequency response method. By applying AC voltage signals of different frequencies to both ends of the insulating medium material, a responsive current signal is generated in the medium. The amplitude and phase of the responsive current signal are measured. Based on the relevant information of the voltage signal, information such as dielectric loss, complex capacitance, and complex dielectric constant of the insulating material is calculated. This information is closely related to the insulation state, and the insulation state can be effectively evaluated by using this information.

Main technical parameter