Substation automation system (SAS) with insulation on-line monitoring function for high voltage electric power equipment

Abstract

The invention relates to a technology for realizing insulation state on-line monitoring for high voltage electric power equipment in a substation under the architecture of a substation automation system (SAS), and discloses a method, a device and a system of insulation on-line monitoring for high voltage electric power equipment, which realizes synchronized phasor measurement by using a measurement unit at a spacer layer of the SAS and is realized by combining the internal communication of the SAS. The system comprises a monitoring main station at a station control layer, a synchronized phasor measurement unit (PMU) at a spacer layer, and a current synchronized phasor measurement unit (IPMU) which is locally installed dispersedly. The PMU and the IPMU realize the phasor measurement based on clock synchronization, and the PMU realizes the measurement at the spacer layer and the insulation on-line monitoring for main equipment; the IPMU measures the synchronized phasor of the leakage current of capacitive equipment and realizes the insulation on-line monitoring for the capacitive equipment by using the busbar voltage measured by the PMU; and the characteristic quantity of insulation monitoring adopts the variable quantity of leakage active power. The monitor main station, the PMU and the IPMU can also form a special insulation on-line monitoring system for the high voltage electric power equipment.

Description

technical field [0001] The invention relates to insulation monitoring of high-voltage power equipment in substations of electric power systems and power plants, and belongs to the field of state maintenance and on-line monitoring of high-voltage power equipment and the field of substation automation. Background technique [0002] Ultra-high voltage and ultra-high voltage transmission are the characteristics of modern power systems and transmission networks. Higher voltage levels put forward higher requirements for the insulation of power equipment, and at the same time stimulate the application of material science and online monitoring technology. The vast majority of faults in UHV and EHV power grids are manifested as insulation damage, and high-voltage power equipment other than transmission lines are concentrated in substations, including main transformers, high-voltage circuit breakers, current transformers (CT), capacitive voltage Transformer (CPT), bushing, coupling ca...

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