Demarcation breaker for vector-synthesis zero sequence current

Abstract

The invention discloses a dividing breaker of a vector combined zero-sequence current which consists of the body of the dividing breaker, an intelligent dividing controller and a cable connection device; the body of the dividing breaker and the intelligent dividing controller are connected by the cable connection device; the invention is characterized in that the body of the dividing breaker consists of the breaker, a signal-phase voltage mutual inductor and an integral mutual inductor of protection and zero-sequence currents; the integral mutual inductor of protection and zero-sequence currents consists of three Rogowski coil combiners which are respectively sheathed on the power of the inlet wire of a three-phase user. The dividing breaker of a vector combined zero-sequence current has the advantages of zero-sequence protection function, short circuit breaking capacity, re-switching function, being capable of greatly reducing the implicative accidental power-off of non-failure circuits, shortening the failure power-off ranges and improving the power supply reliability of a user, non-SF6 and non-environmental pollution. The dividing breaker is an intelligent switch device mountedby a 'T joint' branch user on a novel overhead power line of 10kV and can automatically isolate the failures at a user terminal after being applied and prevent the accident at the user side to affecta power distribution network.

Description

technical field [0001] The present invention relates to power switchgear, in particular to a vector synthesis zero-sequence current with zero-sequence protection function, short-circuit breaking capability, reclosing function, automatic isolation of user-side faults, and prevention of user-side accidents from affecting power distribution networks demarcation circuit breaker. Background technique [0002] With the further improvement of users' requirements for power supply reliability, various power companies have higher requirements for switchgear at the entrance of distribution network branch lines. The circuit breakers and load switches commonly used now have no zero-sequence protection function, because my country's 10kV power system is generally In the neutral point ungrounded system, when a single-phase ground fault occurs, the fault current is small, and the small current protection function cannot be realized, which brings great losses to the power system. In order to...

AI Technical Summary

Problems solved by technology

For example, the patent name is "intelligent boundary load switch (application number: 200620122673.5)", the patent name is "user boundary switch (application number: 200710029653.2)", and the patent name is "user boundary switch (application number: 200720053125.6)", However, the above three patents have the following three disadvantages: 1. These three patented technologies are based on load switch technology. Since the load switch cannot break the short-circuit current, when a permanent phase-to-phase short-circuit fault occurs on the side of the user branch line, the boundary load switch The switch must be opened after the substation outlet circuit breaker protection trips. When the substation outlet circuit breaker is reclosed, the boundary load switch is no longer closed to get rid of the faulty line.

Although the first patented technology does not mention SF in the specification 6 , but in practical application, the patentee of this patent also filled the switch box of the product developed by Xi'an High Voltage Apparatus Research Institute with SF 6 gas, so these three patented technologies will undoubtedly cause damage to the environment

Images