Quick fault current restrictor based on carrier isolator

A fault current and isolator technology, applied in the field of fast fault current limiters, can solve the problems of increasing the short circuit level of the system, and achieve the effects of reducing loss, improving safety and stability, and suppressing short circuit current.

Active Publication Date: 2011-10-19
CHINA EPRI SCIENCE & TECHNOLOGY CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The promotion and application of large-scale distributed power and renewable energy will lead to a significant increase in the level of system short-circuit

Method used

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  • Quick fault current restrictor based on carrier isolator
  • Quick fault current restrictor based on carrier isolator
  • Quick fault current restrictor based on carrier isolator

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Embodiment Construction

[0025] The specific embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0026] The basic principle of the fault current limiter is that it does not affect the power flow of the system when the power system is working normally, and puts in a current limiting device to limit the short-circuit current when the power system fails. Fault current limiters based on fuses and load switches have the longest history and have been widely used in the breaking and protection of distribution transformers with a short-circuit capacity of 1600kVA and below in 10kV urban networks. However, the disadvantage of this kind of fault current limiter is that the response time of the fuse is not fast enough, the disconnection of the fuse cannot be completely guaranteed, and the problem of partial power failure of the system after disconnection. The fast fault current limiter based on the current-carrying limiter proposed by th...

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Abstract

The invention relates to a quick fault current restrictor based on a carrier isolator, comprising a carrier isolator, an ignition pulse transformer, an electronic measuring and controlling unit, a sensor, a current-limiting reactor, an MOA, a bypass switch, a first isolation switch, a first grounding switch, a second isolation switch, a second grounding switch and a bus-bar; the sensor, a first isolation switch carrier isolator and a third isolation switch are connected on the bus-bar in sequence; one end of the first grounding switch and one end of the second grounding switch are connected with the bus-bar; the other ends of the first grounding switch and the second grounding switch are grounded; the electronic measuring and control unit is connected with one end of the sensor and one end of the ignition pulse transformer respectively; the other end of the ignition pulse transformer is connected with the carrier isolator; and the bypass switch and the MOA are connected in parallel with the current-limiting reactor in sequence. The device provided by the invention can detect the system current failure in time, can restrict the fault current, does not affect the normal power supply of a user, enhances the power supply reliability, and realizes flexible and self-adaptive fault current treatment and self-healing.

Description

technical field [0001] The invention relates to a fault current limiter in the field of flexible alternating current transmission (FACTS) of a power system, in particular to a fast fault current limiter based on a current-carrying isolator. Background technique [0002] With the rapid development of the power system, the continuous increase in the capacity of single machines and power plants, the capacity of substations, the load and load density of cities and industrial centers, and the interconnection between power systems, a new prominent problem has emerged, that is, modern The level of short-circuit current in the power grid at all levels of the large power system continues to increase. The investment of large power sources in the load center has further accelerated the growth of the short-circuit current level. The short-circuit current in some areas of the system has reached or even exceeded the breaking capacity of the circuit breaker, and the rising trend is getting...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H9/02
Inventor 武守远戴朝波谢炜
Owner CHINA EPRI SCIENCE & TECHNOLOGY CO LTD
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