Hybrid type flux coupling superconduction fault current limiter and current limitation method

Abstract

The invention relates to a hybrid type flux coupling superconduction fault current limiter and current limitation method. According to the hybrid type flux coupling superconduction fault current limiter, a primary side winding coil of a coupling transformer and a high-speed switch are connected and are connected into an MOA zinc oxide resistor disc, a secondary side winding coil is connected with a superconduction current limiting material in series, and then the primary side winding coil and the secondary primary side winding coil are connected in an anti-parallel mode and then are connected into a main loop of a power system. When the power system operates normally, the high-speed switch is switched on; when the power system short-circuits, the high-speed switch is controlled to be triggered and switched off, the flux locking characteristic of the coupling transformer is relieved, the superconduction material is switched to be at the high resistance state as the through-flow of the superconduction material is larger than a set critical current, and at the moment, the current limiter carries out fault current limitation in an inductance-resistance hybrid mode. The hybrid type flux coupling superconduction fault current limiter is simple in structure and rapid in response, exchange losses generated when the superconduction current limiting material operates normally are reduced, and system economical efficiency of current limiting equipment is improved.

Description

technical field [0001] The invention relates to the field of power system and automation, in particular to a hybrid magnetic flux coupling superconducting fault current limiter and a current limiting method. Background technique [0002] With the prosperity of the society and the progress of the economy, the electric power industry, which is the basic industry of the country, is also developing rapidly. Unit capacity, power plant capacity, and urban and industrial power loads are increasing, coupled with users' increasing demand for power supply guarantee capability, power supply quality and reliability, making the power grid evolve to a larger scale, and the national power grid interconnection is gradually form. In fact, the rapid development of power system scale and the application of Internet technology increase the transmission capacity of the system on the one hand and improve the flexibility of system operation, on the other hand, it also greatly enhances its own com...

AI Technical Summary

Problems solved by technology

At present, although some foreign manufacturers can produce circuit breakers with a breaking current of 80kA, the actual number of them used is very small, and it is difficult to guarantee safety and reliability; second, increasing the breaking capacity also means that the cost of equipment will increase. The cost of the circuit breaker is about 1.8 times that of a 63kA circuit breaker, and it will also involve the transformation or replacement of other existing auxiliary equipment, and the total investment will be relatively large

A large number of equipment transformations will also affect production operations, and the resulting economic losses are also very considerable

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