Pole-mounted distribution substation traveling wave detection method

Abstract

The invention relates to a pole-mounted distribution substation traveling wave detection method. The pole-mounted distribution substation traveling wave detection method comprises the steps that the high-frequency band component amplitude of the current on a grounding line of a pole-mounted distribution substation is measured, and if the high-frequency band component amplitude is larger than a set value of the high-frequency band component amplitude, the high-frequency band component amplitude is judged to be a distribution network transient state jump signal; the energy value of a high-frequency band component and the energy value of a low-frequency band component of the current of the grounding wire after the transient state jump signal appears are calculated respectively, and if the energy value of the high-frequency band component is larger than a set value of the energy value of the high-frequency band component and the energy value of the low-frequency band component is smaller that a set value of the energy value of the low-frequency band component, it is detected that a fault of a distribution network on the high-voltage side of a transformer is generated, and a fault traveling wave signal is transmitted to the pole-mounted distribution substation; if the energy value of the high-frequency band component and the energy value of the low-frequency band component are larger than the respectively set values, it is detected that a fault of the distribution network on the low-voltage side of the transformer is generated, and a fault traveling wave signal is transmitted to the pole-mounted distribution substation. The pole-mounted distribution substation traveling wave detection method has the advantages that the traveling wave detection precision is high, the manufacturing cost is low, installation is easy and convenient, and application and popularization are easy. The pole-mounted distribution substation traveling wave detection method can be used for power grid fault traveling wave protecting and positioning.

Description

technical field [0001] The invention relates to a traveling wave detection method of a power distribution substation on a pole. Background technique [0002] As a power network directly connected to the user end, the distribution network is responsible for the important task of supplying power to people's lives and industrial production. Once the distribution network fails, it will affect people's production and life, and even affect personal and equipment safety; If it is not cleared in time, it will lead to further expansion of the fault and cause a large-scale power outage. For this reason, grid operators must locate faults in the shortest possible time, determine the location of the fault point, find the line fault point, clear the fault, and restore the normal operation of the power grid as soon as possible. [0003] Distribution network fault traveling wave location technology is the current development direction of distribution network fault detection technology. The...

AI Technical Summary

Problems solved by technology

However, according to the principle of traveling wave transmission, the current traveling wave will be totally reflected in the power distribution substation (only one high-voltage outgoing line) on the end column of the distribution network line. The wave method has blind spots in the detection of traveling waves in distribution substations on poles, so it cannot be applied to the detection of traveling waves in distribution substations on poles; voltage traveling wave detection technology is also widely used in domestic transmission networks, and usually requires the development of special traveling wave sensors, connected in series or set Connect to the CVT ground wire to extract the voltage traveling wave signal

Since the pole-mounted distribution substation at the end of the distribution network does not use CVT devices, the existing voltage traveling wave detection technology cannot be applied to pole-mounted distribution substation traveling wave detection.

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