Abstract
In order to meet the requirements of partial discharge (PD) detection of electrical equipment in substation station area, the ultra-high frequency (UHF) antenna with broadband, high gain and horizontal plane (H-plane) omnidirectional is studied and designed as a PD sensor. By analyzing the characteristic impedance and structural characteristics of the biconic antenna, it is determined to be an UHF omnidirectional wideband antenna for detecting PD. The influence of structural parameters such as half-cone angle and vertebral body height on the antenna performance is simulated. At last, a double cone antenna is made and its bandwidth, directional pattern, gain and equivalent height are tested.
Highlights
Substation is an important link of electric energy transmission between power plant and users, and the failure of substation equipment seriously threatens the safe and reliable operation of power system [1,2,3]
When partial discharge (PD) occurs in power equipment, the radiated electromagnetic wave signal can leak into the substation space through the non-metallic shielding parts, and the electric field intensity is approximately inversely proportional to the propagation distance, which can be detected at a distance by the highsensitivity ultra-high frequency (UHF) antenna
The UHF omni-directional broadband antenna developed in this paper has the characteristics of wide working frequency band, omni-directional and high detection sensitivity in the horizontal plane, which can effectively detect and locate the PD of electrical equipment in substations
Summary
Substation is an important link of electric energy transmission between power plant and users, and the failure of substation equipment seriously threatens the safe and reliable operation of power system [1,2,3]. Antenna sensor should be able to receive electromagnetic wave signals radiated into the air due to corona discharge of electrical equipment from a certain distance [12,13].To facilitate the movement of the antenna array in the substation with limited space, the antenna design must meet the following conditions: the directional pattern on H-plane is omnidirectional, that is, the directional pattern of the antenna on H-plan is circular [14].In the detection of PD in substations, the antenna is required to be able to effectively receive UHF signals of PD from all horizontal directions and have a large impedance bandwidth [15].It is generally believed that the frequency band of PD UHF signal is 0.3-3GHz[16].
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