Rogowski coil-based method and Rogowski coil-based device for detecting direct-current short-circuit current fault

Abstract

The invention relates to a Rogowski coil-based method and a Rogowski coil-based device for detecting a direct-current short-circuit current fault. The device comprises a Rogowski coil. A Rogowski coil measurement differential output signal is divided into two paths, wherein one path of the signal is communicated with a high-pass filtering unit, a first voltage comparison unit, a logic gate circuit and a circuit time delay unit in sequence; the other path of the signal is communicated with a low-pass filtering unit and a second voltage comparison unit in sequence; and a Rogowski coil measurement integration output signal is communicated with a third voltage comparison unit. The Rogowski coil-based method and the Rogowski coil-based device for detecting the direct-current short-circuit current fault are based on a protecting strategy of combining two criterions of a short-circuit current amplitude and a short-circuit current rate of rise, and under such a manner, the action reliability of a protecting device is improved, good electromagnetic compatibility can still be kept under the condition of stronger electromagnetic interference, the false tripping possibility of a tripper is reduced to a maximum degree, and simultaneously, the device can be ensured to still accurately and normally work under the condition of stronger electromagnetic interference. Simultaneously, the Rogowski coil-based method and the Rogowski coil-based device for detecting the direct-current short-circuit current fault are capable of well reducing the impact on a system under the short-circuit condition and relieving the load of a break.

Description

technical field [0001] The invention relates to a direct current large current measurement technology, which belongs to electric quantity measuring instruments and meters. In particular, it relates to a method and a device for detecting a DC short-circuit current fault based on a Rogowski coil. Background technique [0002] In recent years, with the development of the power system, the power system is developing in the direction of large capacity, high voltage and high current. The harm of its short-circuit current is also becoming more and more serious. This puts forward higher requirements for the short-circuit current protection device. [0003] When a short-circuit fault occurs, the fault current must be detected at the initial stage of the short-circuit fault, that is, during the rising period of the short-circuit current, and a protective action must be taken, otherwise it will cause great harm to the system. Traditional current measurement methods have been difficu...

AI Technical Summary

Problems solved by technology

Traditional current measurement methods have been difficult to meet the needs of protection devices, and current transformers based on Rogowski coils have attracted more and more attention because they can directly obtain the change rate of short-circuit current

However, there is no mature and simple method to achieve rapid protection based on Rogowski coil current transformers

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