Online measuring device of inductive voltage of cable sheath

A technology of induced voltage and cable sheath, applied in voltage/current isolation, measurement using digital measurement technology, signal transmission system, etc., can solve problems such as inability to measure, poor measurement sensitivity, low accuracy, etc., to prevent operational accidents Occurrence, the effect of prolonging the operating life
CN110702973AInactive Publication Date: 2020-01-17四川国信慧通电气技术有限公司
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
四川国信慧通电气技术有限公司
Publication Date
2020-01-17
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention is suitable for the technical field of electric power measurement, and provides an online measuring device of inductive voltage of a cable sheath. Instead of using PT for electrical isolation, the inductive voltage of the metal sheath is directly connected to the detection circuit of the measuring board for measurement, the measuring board is powered by the isolation power supply, and the measurement result is transmitted to the main control board at the back end through the isolation serial port, so as to achieve the electrical isolation effect of the signal acquisition end andthe control end at the back end. As an electric signal is electrically connected to the metal sheath of the cable directly, the online measuring device is not affected by the magnitude of the inductive voltage, is high in sensitivity and accuracy, discovers potential fault risks in time, provides technical basis and reference for the adjustment and optimization of cable grounding methods and sheath protector selection of cable operation units, can effectively prevent operating accidents and prolong the operating life of medium and high-voltage crosslinked cable lines.
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Description

technical field

[0001] The invention relates to the technical field of power measurement, in particular to an on-line measurement device for induced voltage of a cable sheath. Background technique

[0002] When the core of a single-core power cable flows through an alternating current, an alternating magnetic field is generated around the alternating current to form a magnetic flux that intersects with the cable loop, and the magnetic flux intersects with the metal sheath of the cable at the same time. Therefore, A voltage will be induced on the metal sheath. The induced voltage is related to the length of the cable, the longer the length, the higher the induced voltage.

[0003] For the safe operation of the cable, the national standard stipulates that the metal sheath of the AC single-phase cable must be directly grounded, and the normal induced voltage at any point on the metal sheath that is not grounded should meet the following regulations: For safety measures, it mu...

Claims

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