Fault current-limiting device for transmission and distribution electric network

A fault current limiter and fault current limiting technology, applied in power network operating system integration, electrical components, circuit devices, etc., can solve the problems of long interruption time, poor reliability, and inability to limit steady-state fault current, and achieve reliable The effect of cutting off fault current and reducing impact

CN1508937AInactive Publication Date: 2004-06-30INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2004-06-30
Estimated Expiration
Not applicable · inactive patent

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Abstract

The circuit is installed at line outlet of electric power system and cascaded to a breaker. The circuit comprises four pair of controlled silicons paralleled in positive and negative direction and cascaded pairwise. The said circuit of silicons is connected to an equivalent current source in parallel. The invention possesses features of high efficiency, simple structure, reliable, solves too large failure current of electric system as well as lowers current tolerance for requiring each electric component, and design specification of system. The circuit raises stability, safety and reliability if it is utilized in high voltage or supervoltage transmission.
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Description

Technical field:

[0001] The invention relates to a fault current limiter for transmission and distribution network, which belongs to the technical field of electric engineering. Background technique:

[0002] Due to the development of the power system, the increase of load, the investment of large-capacity units, power plants and substation equipment, especially the emergence of large power plants in the load center and the interconnection of large power systems, the capacity of the transmission and distribution network has been greatly increased, and at the same time, the short-circuit The current level is increasing day by day, and even the short-circuit current level in some places has exceeded the breaking capacity of the current circuit breaker. If no restrictive measures are taken to control it, not only will the equipment investment of the new substation be greatly increased, but it will also have a great impact on the original substation equipment in the system, and ...

Examples

Embodiment Construction

[0016] The present invention will be further described below in conjunction with accompanying drawing and embodiment;

[0017] The present invention as figure 2 , image 3 Shown in the dotted box. exist figure 2 In a single-phase system, the present invention is connected to the outlet of the AC line of the system and connected in series with the circuit breaker DL. It consists of four pairs of thyristors T 1 , T 2 ,T 3 , T 4 ,T 5 , T 6 ,T 7 , T 8 After being connected in series with equivalent current source I DC composed in parallel. exist image 3 In the three-phase system, the present invention is respectively connected to the outlets of the three-phase A, B and C lines in series with the circuit breaker DL, and the three phases are respectively composed of four pairs of thyristors T 1 , T 2 ,T 3 , T 4 ,T 5 , T 6 ,T 7 , T 8 After being connected in series with equivalent current source I DC composed in parallel. figure 2 , image 3 Middle R L 、X...