Equivalent height compensation measurement system and method of local discharging ultrahigh-frequency sensor

Abstract

The invention discloses an equivalent height compensation measurement system and method of a local discharging ultrahigh-frequency sensor. The equivalent height compensation measurement system comprises a GTEM chamber, a radio-frequency signal source, a radio-frequency power amplifier, a coaxial connector, an electric field probe, an electric field measurement module, a monopole standard probe, ameasurement and control computer and a high-speed oscilloscope, wherein a test window is formed in a part above the GTEM chamber, and the monopole standard probe is used for transferring a known function. An electric field where a measurement position of the monopole standard probe is used as a reference, electric field values at different positions are measured by the electric field probes and are compared with an electric field reference to obtain corresponding compensation quantity, compensation calculation is performed on the electric field at a position where a measured ultrahigh-frequency sensor is located to obtain measured sensor compensation quantity, so that the influence of non-uniform electric field on equivalent height of the measured ultrahigh-frequency sensor caused by different test positions is reduced, and the equivalent height measurement accuracy of the ultrahigh-frequency sensor is further improved.

Description

technical field [0001] The invention belongs to the technical field of instrumentation detection, and relates to a performance detection problem of a partial discharge ultra-high frequency sensor, in particular to a compensation measurement system and method for the equivalent height of a partial discharge ultra-high frequency sensor. Background technique [0002] Partial discharge is an important means of insulation evaluation of power transformers, GIS and other equipment. With the deepening of the state-of-the-art maintenance of power systems in my country, the partial discharge UHF detection technology has high sensitivity, strong anti-interference ability and can be used for partial discharge identification. And other advantages, widely used in partial discharge detection of transformers, GIS and other electrical equipment. Partial discharge UHF sensor is the core component of UHF method for detecting and diagnosing partial discharge faults of GIS equipment. The performa...

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Problems solved by technology

The above documents all use the reference sensor and the sensor under test, and use the test window on the top of the GTEM cell to detect the time-domain or frequency-domain value of the equivalent height of the sensor under test. However, since the test window on the top of the chamber is not a traditional uniform electric field test area, the electric field changes significantly at different test positions. It is necessary to accurately measure the electric field at the position of the reference sensor and the sensor under test to ensure the accuracy of the equivalent height measurement of the UHF sensor. sex

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