Energy-saving outdoor grid current limiting device

Abstract

The invention relates to a current limiting device consisting of a current limiting inductor and a high-capacity and high-speed switch which are connected in parallel, in particular to an energy-saving outdoor grid current limiting device, comprising a current limiting inductor and a high-capacity and high-speed switch which are connected in parallel. The energy-saving outdoor grid current limiting device is characterized in that the high-capacity and high-speed switch comprises a tubular insulating shell (8) both ends of which are sealed and are respectively provided with an upper flange (5) and a lower flange (11), and leading-out terminals are respectively arranged on the upper flange (5) and the lower flange (11); a bridge body (1), a fuse and a non-linear resister (7) are installed in the insulating shell (8) which is also provided with a measuring and control unit (2) consisting of a controller and a current inductor (9). The invention can not only be used in a medium-voltage system, but also have obvious effect on short-circuit current limitation of 110kV and 220kV high-voltage grids.

Description

technical field [0001] The invention relates to a current-limiting device composed of a current-limiting reactor and a large-capacity high-speed switch connected in parallel, in particular to an energy-saving outdoor power grid current-limiting device. Background technique [0002] With the leap-forward development of the State Grid Corporation, the 1000kV UHV demonstration project has been put into operation, and the 750kV UHV AC power grid has begun to take shape. The rapid increase in the installed capacity of the power grid will make the short-circuit current of the power grid increase rapidly, which has appeared or will appear in many areas. The case where a circuit breaker with a large breaking capacity cannot be selected. When the short-circuit current exceeds the maximum breaking capacity of the circuit breaker, it is necessary to limit the short-circuit current by changing the power grid structure and operation mode, such as grid partition operation, electromagnetic...

AI Technical Summary

Problems solved by technology

However, the use of large-capacity high-speed switches has some disadvantages. After the large-capacity high-speed switchgear is disconnected, the faulty line is cut off, which brings safety hazards to the stable operation of some loads that cannot be powered off. Moreover, FSR can only be installed indoors and cannot be installed outdoors. in complex environment

There are many domestic cases of eliminating operating loss and voltage reduction of current-limiting reactors, all of which are connected in parallel with a large-capacity high-speed switch through a switch cabinet at both ends of the current-limiting reactor. The control of the high-speed switch is realized on the secondary side, and the control signal The trigger signal is issued through the insulating transformer, and the control circuit power supply is provided by the substation. Due to the limitation of the insulation level, it is mostly used in the 6-35 kV high-voltage room. There are many operating links and many restrictions. It is inconvenient to install and use. The length of the busbar increases the probability of failure

Images