Flat-plate type broad frequency sensor for power transmission engineering

Abstract

A flat type wide frequency sensor for a power transmission project comprises a GIS casing 1, a cavity mask 24, a pole plate 3, an insulation film 2, a connector 5, a plug 11, a tray 15 and matched resistors 14, wherein the cavity mask 24 is arranged at the opening of the GIS casing 1, the pole plate 3 adheres to the cavity mask 24 with the in-between insulation film 2, the pole plate 3 is electrically connected with the masking type plug 11 through the insulated connector 5, the plug 11 is fixed on the cavity mask 24, the tray 15 which is fixed in the inner cavity of the cavity mask 24 is arranged between the connector 5 and the plug 11, the axle center of the plug 11 is positioned at the circular center of the tray 15, and a plurality of paralleled matched resistors 14 are evenly distributed along the circumference of the tray 15. The flat type wide frequency sensor is a practical quick steep-wave sensor integrating a capacitance sensor, the measurement system matched resistors, a signal masking protective function and an inserting piece for connecting a measurement cable. Furthermore, a plurality of paralleled matched resistors are evenly distributed in the sensor, thereby bringing about the little stray inductance of a measurement system, little wave form distortion and wide measurement frequency domain. The flat type wide frequency sensor is applicable to the VFTO measurement in the GIS or H-GIS.

Description

technical field [0001] The invention belongs to a fast steep wave sensor for power transmission engineering, and is particularly suitable for on-line fast steep wave (VFTO) measurement of VFTO in UHV engineering equipment GIS and H-GIS, and can also be used for partial discharge measurement and power frequency voltage measurement. Background technique [0002] The operation of disconnectors in gas-insulated substations (GIS) and semi-gas-insulated substations (H-GIS) is very easy to generate fast steep overvoltage (VFTO) with high voltage amplitude and steep rise time. The higher the voltage level, the greater the harm of VFTO to GIS and H-GIS, especially for UHV projects. [0003] When the voltage level is low (such as 220kV, 500kV), in the actual project, the spherical capacitance probe packaged in the insulator is used as the sensor, and the supporting low-voltage arm capacitor is externally placed, and the external low-voltage arm capacitor and the auxiliary lead lead to...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to solve the problem of the large parasitic inductance of the existing VFTO measuring flat sensor, the existence of the transition lead leads to the wave distortion caused by the refraction and reflection of the traveling wave, and the sealing reliability and long-term stability of the engineering for sensor access are not considered. For engineering practical problems such as sensor installation, built-in matching impedance, and integrated connection of coaxial signal transmission and shielding wires, a practical flat-panel broadband sensor for power transmission engineering is provided for online measurement of VFTO in GIS and H-GIS for UHV engineering Lay foundation; The present invention also can be applied to ultra-high voltage engineering VFTO measuring sensor, can be applied to partial discharge measurement and positioning sensor in GIS and H-GIS, can also be applied to GIS and H-GIS steady-state voltage (power frequency voltage ) sensor for measurement

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