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66kV low excitation impedance transformer and method for realizing grounding transfer thereof

A technology of excitation impedance and transformer, which is applied in the field of power system, can solve problems such as difficulty in signal injection, achieve the effects of compact overall structure, convenient installation, and improved power supply safety

Pending Publication Date: 2022-03-11
JINZHOU ELECTRIC POWER SUPPLY COMPANY OF STATE GRID LIAONING ELECTRIC POWER SUPPLY +1
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Problems solved by technology

To solve the problem of difficult signal injection in the neutral point ungrounded system, it can effectively improve the safety of power supply

Method used

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  • 66kV low excitation impedance transformer and method for realizing grounding transfer thereof

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Embodiment Construction

[0019] In order to make the technical means, creative features, goals and effects achieved by the present invention easy to understand, the present invention will be further described below in conjunction with specific embodiments.

[0020] refer to figure 1 As shown, a 66kV low excitation impedance transformer provided by the present invention is composed of a primary coil W1, a primary secondary coil W2 and a sub-secondary coil W3; the primary coil W1 is used to connect with a single-phase grounding circuit breaker, and the other side It is used for grounding connection with the main ground network 4 of the substation, and the secondary coils W2 and W3 are respectively used for characteristic signal injection and measurement; the end of the primary coil W1 is equipped with a single-phase current transformer 6, and the transformation ratio of the single-phase current transformer 6 is 200 / 5, accuracy level 5P20 to meet system requirements.

[0021] The primary coil W1 is used...

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Abstract

The invention relates to a 66kV low excitation impedance transformer and a method for realizing grounding transfer thereof, which solve the problem of difficult signal injection in a neutral point ungrounded system and can effectively improve the power supply safety. Comprising a primary coil W1, a first secondary coil W2 and a second secondary coil W3, the primary coil W1 is used for being connected with a single-phase circuit breaker, the other side of the primary coil W1 is used for being connected with a transformer substation main ground grid in a grounding mode, and the first secondary coil W2 and the second secondary coil W3 are used for characteristic signal injection and measurement respectively. The transformer is characterized in that the rated current of the primary coil W1 is 200A, and the terminal voltage of the primary coil W1 is 150V; the secondary coil W2 is used as a main secondary winding, and the limit current is 150A; the terminal voltage is 37.5 V; the secondary coil W3 serves as an auxiliary secondary winding, and the limit current is 150A; the terminal voltage is 9.375 V; the tail end of the primary coil W1 is provided with a single-phase current transformer.

Description

technical field [0001] The invention belongs to the technical field of power systems, in particular to a 66kV low excitation impedance transformer and a method for realizing grounding transfer. Background technique [0002] Traditional energy supply can no longer keep pace with the current social development. In addition, traditional energy has disadvantages such as low efficiency, non-environmental protection, and non-renewable. Therefore, new clean and renewable energy is considered to provide support for social development. Taking into account factors such as economy, high efficiency, and environmental protection, electric energy is relatively the most suitable energy source on the whole. [0003] With the passage of time, my country has achieved world-renowned development in various fields, especially in the construction of power grids in my country. The construction area involves various remote areas, covering almost every village and every household. Try to make every ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M5/12H02H9/08H02H7/26H02H3/06
CPCH02M5/12H02H9/08H02H7/26H02H3/066
Inventor 孟镇潘月明邱鹏付一峰祝杰
Owner JINZHOU ELECTRIC POWER SUPPLY COMPANY OF STATE GRID LIAONING ELECTRIC POWER SUPPLY
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