Method for discriminating and diagnosing incomplete switching-on of disconnector based on current analysis during inverted operation of busbar

Abstract

The invention discloses a method for discriminating and diagnosing the incomplete switching-on of a disconnector based on current analysis during an inverted operation of a busbar. The method comprises the steps: obtaining the real-time data of load current, state position and deflection information of a corresponding device as an input information source of the method through the data communication with a conventional measurement and control device; performing the processing of the data and information according to the model and algorithm set in the invention; and outputting a locking signalor warning information to a conventional measurement and control system or anti-misoperation device when a calculation result determines a switching-on abnormality of the corresponding disconnector. The invention provides a brand-new solution for overcoming a discrimination difficulty of whether the switching-on of the disconnector is fully reliable or not during the inverted operation, so as to guarantee the operation safety and reliable power supply of a transformer substation.

Description

technical field [0001] The invention belongs to the technical field of busbar inversion, and in particular relates to a method for differential diagnosis of incomplete closure of isolation switch blades during busbar inversion operation based on current analysis. Background technique [0002] The double-bus connection method is widely used in substations of various voltage levels because of its outstanding features of reliability and flexibility. In this wiring mode, lines or components (mainly referring to transformers) can be flexibly switched between the two buses depending on the operation needs. This switching operation is called "inverting" operation in the industry. Among them, the inversion operation performed under the condition that the circuit or components are not powered off is called "hot inversion", whereas the inversion operation performed under the condition of power failure is called "cold inversion". Restricted by power supply reliability requirements, t...

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Problems solved by technology

Secondly, its application will increase the complexity of the operation (such as the need to change the protection to the signal during the inversion process, etc.), and this increase in complexity also means that the operation safety will be reduced. The overall effect is debatable. Promotion will also encounter great resistance

[0009] The second is to design and install a contact resistance on-line measurement device for the isolation switch. Regardless of whether the technical solution is reliable or not, and the economy is reasonable (the area of ​​the isolation switch is large), the operation and maintenance of such a large number of devices will undoubtedly greatly increase the operation. Unit's burden

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