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Flexible opening and network disconnection auxiliary device

An auxiliary device and flexible technology, applied in circuit devices, emergency protection circuit devices, emergency protection circuit devices for limiting overcurrent/overvoltage, etc. question

Active Publication Date: 2021-05-18
HAINAN JINPAN INTELLIGENCE TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It may cause accidents such as insulation breakdown of high-voltage equipment, failure of circuit equipment or even damage to circuit breakers, and burning of high-voltage switchgear.

Method used

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  • Flexible opening and network disconnection auxiliary device
  • Flexible opening and network disconnection auxiliary device

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Embodiment Construction

[0022] The core of the present invention is to provide an auxiliary device for flexible opening and disconnection of power transformers, which provides a load and excitation current freewheeling circuit for the power transformer when the power transformer is open and disconnected without load, thereby reducing the no-load load of the power transformer. The operating overvoltage caused by the disconnection of the network realizes flexible opening and disconnection of the network. The device ensures local grid stability and equipment insulation safety.

[0023] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments...

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Abstract

The invention discloses a power transformer flexible opening and network disconnection auxiliary device which comprises an auxiliary transformer, a second circuit breaker, a first switch and a three-phase short-circuit bar. When the power transformer is in no-load opening and network disconnection, the auxiliary transformer has certain short-circuit impedance, so that the short-circuit impedance of the auxiliary device becomes a small load of the power transformer; and an exciting current follow current loop is provided for the power transformer, so that operation overvoltage caused by no-load network disconnection of the power transformer is reduced, and flexible opening network disconnection is realized. The device ensures the local power grid stability and the device insulation safety.

Description

technical field [0001] The invention relates to the field of power supply, in particular to a flexible opening and disconnection auxiliary device. Background technique [0002] A transformer is a device that uses the principle of electromagnetic induction to change the AC voltage to transmit electrical energy. In the power system, from power generation, power transmission to power distribution network, transformers and switchgears are connected to power grids of different voltage levels. Among them, high-voltage and large-capacity power transformers and vacuum circuit breakers are widely used. [0003] Vacuum circuit breakers have many advantages such as small maintenance workload, large breaking capacity, suitable for frequent operation, etc., and are widely used in grid connection and protection of large-capacity power transformers. The contacts of the vacuum circuit breaker generally have different degrees of bouncing phenomenon when closing, and operating overvoltage m...

Claims

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Application Information

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IPC IPC(8): H02H9/04H01F27/42
CPCH02H9/04H01F27/42
Inventor 王忠波杨雄王耀强严攀
Owner HAINAN JINPAN INTELLIGENCE TECH CO LTD
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