Superconducting air-core transformer and system for changing 35kV neutral point grounding mode of power grid

Abstract

The invention provides a superconducting air-core transformer and system for changing a 35kV neutral point grounding mode of a power grid. The superconducting air-core transformer comprises a superconducting air-core transformer body, a small-resistance grounding system and a monitoring protection system. An outgoing line neutral point connecting wire of the superconducting air-core transformer isconnected with the small-resistance grounding system, and a data monitoring cable of the superconducting air-core transformer is connected with the monitoring protection system. The user station canbe isolated from the main net rack by additionally arranging the superconducting substation, the grounding form of the user substation can be changed, and the flexibility of a user substation grounding system is improved.

Description

technical field [0001] The disclosure belongs to the technical field of substation structures, and in particular relates to a superconducting substation system that changes the grounding mode of a 35kV neutral point of a power grid. Background technique [0002] The statements in this section merely provide background information related to the present disclosure and do not necessarily constitute prior art. [0003] The neutral point grounding method affects the reliability of line power supply, the scope of faults, the insulation level of electrical equipment, etc. At the same time, the convenience of operation, the reliability of relay protection, and the grounding method of the original system must also be considered. Different forms of neutral point grounding methods have different application ranges. [0004] The inventor found in the research that in the current 35kV substation, because the substation cannot flexibly consider the equipment insulation level and relay p...

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Problems solved by technology

[0004] The inventor found in the research that in the current 35kV substation, because the substation cannot flexibly consider the equipment insulation level and relay protection mode according to its own needs, it can only be limited by the operation mode of the power system. The conventional solution to the problem of inconsistent grounding types of the main grid in the region is to use an isolation transformer of the same capacity to change the grounding mode of the center point. The disadvantage is that it is large in size and loss

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