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An Equivalent Circuit Model of Equipotential Shielded Capacitive Voltage Transformer

An equivalent circuit model, a technology of voltage transformers, applied in the direction of voltage/current isolation, etc., can solve problems such as no systematic method, and achieve the effect of enhancing operability, improving efficiency, and ensuring high precision

Active Publication Date: 2020-11-03
GLOBAL ENERGY INTERCONNECTION RES INST CO LTD +2
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, there are only some experimental methods or approximate theoretical calculations for the additional error caused by stray capacitance, and there is no systematic method for research

Method used

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  • An Equivalent Circuit Model of Equipotential Shielded Capacitive Voltage Transformer
  • An Equivalent Circuit Model of Equipotential Shielded Capacitive Voltage Transformer
  • An Equivalent Circuit Model of Equipotential Shielded Capacitive Voltage Transformer

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Embodiment Construction

[0025] Combine below Figure 1-5 The method of establishing the equipotential shielding equipotential shielding capacitive voltage transformer equivalent model is described in detail:

[0026] Step 1: According to the actual layout of the electrical equipment of the 1000kV UHV AC substation in Southeast Shanxi, a three-phase equivalent model of the substation inlet section is established, including the voltage equalizing ring model of the GIS bushing, grounding switch, equipotential shielding capacitive voltage transformer, post insulator and arrester . The charging state of each voltage equalizing ring reflects the charged state of the adjacent phase electrical equipment, and the capacitance between each voltage equalizing ring and the equipotential shielding capacitor voltage transformer represents the miscellaneous between each electrical equipment and the equipotential shielding capacitor voltage transformer. The stray capacitance is used to calculate the stray capacitanc...

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Abstract

The invention provides an equivalent circuit model of an equipotential shielding capacitive type voltage transformer. The model is characterized by using a flange of each capacitor unit forming a voltage divider to express a capacitive voltage divider of the equipotential shielding capacitive type voltage transformer; using a grading ring of a top of each electrified body to express the electrified body surrounding the equipotential shielding capacitive type voltage transformer; taking all the electrified body grading rings in a same phase of circuit of a transformer substation incoming line segment as a same conductor; and determining a total number of the electrified bodies in the equivalent circuit model and successively numbering, and numbering the flange and the grading ring which is equipotential with the flange as an integral body. In the invention, a foundation is laid for further accurately analyzing an additive error of the capacitive type voltage transformer under a stray parameter influence; a complex stray parameter network under a transformer substation field condition is reasonably simplified, maneuverability of stray parameter extraction is enhanced and stray parameter extraction efficiency is increased; and simultaneously high precision of calculation is guaranteed.

Description

technical field [0001] The invention relates to a power system transformer device, in particular to an equipotential shielding capacitive voltage transformer. Background technique [0002] Capacitive voltage transformer (equipotential shielding capacitive voltage transformer) has high insulation strength, can reduce the steepness of lightning shock wave head, will not cause ferromagnetic resonance with the system, is low in cost, and can also be used as a coupling capacitor for power line carrier communication. And other advantages, it is widely used in the field of power system, the voltage range has covered 35kV ~ 1000kV, and the market share of 110kV and above high voltage level has reached more than 90%. With the development of electricity market transactions, the requirements for the measurement of electric energy are getting higher and higher, and the development of high-precision capacitive voltage transformers has become inevitable. [0003] There are many factors t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R15/18
CPCG01R15/18
Inventor 董巍刘杰纪锋张娟娟查鲲鹏
Owner GLOBAL ENERGY INTERCONNECTION RES INST CO LTD
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