Cable Partial Discharge Test Equipment Based on Optical Electric Field Sensor Voltage Phase Synchronization Technology

Abstract

The invention discloses test equipment for partial discharge of a cable based on a voltage phase synchronization technology of an optical electric field transducer. The test equipment comprises a handhold insulated tool and instrument, a high voltage BGO optical crystal, a high voltage optical fiber, a photoelectric conversion and output unit, a partial discharge test instrument and a synchronous signal transmission wire. The test equipment disclosed by the invention has the advantages that: the test equipment emphatically solves the difficulty in acquirement and synchronization of a voltage signal in a major network during live line test works of field high voltage equipment, is also applicable to any work that needs acquirement of the voltage signal during electrical test; the test equipment is simple and firm in structure, light in weight (less than 1kg), small in volume and convenient in operation on a basis that functional requirements are met, and is applicable to the requirements on live tests of equipment on a pole and a tower as well as ground equipment.

Description

technical field [0001] The invention relates to the working field of electrical performance testing of electric power equipment. Specifically, it is a cable partial discharge test equipment based on optical electric field sensor voltage phase synchronization technology. Background technique [0002] In the current market, partial discharge testing instruments are widely used when performing partial discharge non-stop power testing on cable equipment. There are many manufacturers of such instruments, but the common feature is that they all need to obtain the voltage sine wave data of the primary system of the power grid during the test, including frequency signals, voltage phase signals, etc. The function of this signal is to display the real-time voltage phase signal, and then mark the partial discharge signal captured by the partial discharge instrument at the corresponding phase and signal strength on the voltage phase signal according to the time relationship and signal ...

AI Technical Summary

Problems solved by technology

This is an indirect method, because in the field test, the parameters of the line will vary greatly with the influence of voltage level, cable length, overhead line length, system operation, line space position, and load. Therefore, the voltage and current The phase angle difference will also change. If the phase conversion is performed only through certain experience, then not only cannot the accurate voltage phase be obtained, but also may cause misjudgment due to the wrong phase relationship of the partial discharge map.

[0004] It is difficult to estimate the loss of materials and electricity caused by misjudgments or inaccurate judgments that lead to unnecessary power outages and maintenance of cable lines; and the emergency repairs and electricity caused by cable lines that still fail after testing due to missed judgments The loss is far greater than the loss caused by accurate judgment and planned maintenance

[0005] There is no report of similar device of the present invention at present

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