Partial discharge monitoring method for distributed arrangement of multiple power equipment

Abstract

The invention discloses a partial discharge monitoring method for distributed arrangement of multiple power equipment. The method comprises the following steps: setting a high-frequency shielded bus ring, arranging a plurality of parallel connection points on the high-frequency shielded bus ring, respectively installing a plurality of sensing terminals corresponding to each power equipment in a substation to monitor partial discharge signals, transmitting the monitored partial discharge signals uniaxially to the high-frequency shielded bus ring, connecting a single-channel data acquisition unit with the high-frequency shielded bus ring to enable the partial discharge signals monitored by the plurality of sensing terminals to be transmitted to the single-channel data acquisition unit through a first path and a second path respectively along the high-frequency shielded bus ring, setting length differences of the first path and the second path corresponding to the parallel connection points as different values, so as to produce different time differences, and positioning partial discharge signals according to the different time differences. According to the monitoring method, a plurality of distributed power equipment of the whole substation, which need to be monitored, can be omnidirectionally and synchronously monitored online, and the insulation defect of the power equipment can be timely found and eliminated, and therefore the operation safety of the whole substation is improved.

Description

technical field [0001] The invention relates to a monitoring method, in particular to a monitoring method for partial discharge signals. Background technique [0002] As an important means of insulation diagnosis, partial discharge detection is widely used in the power field because it can reflect the insulation status of electrical equipment in the power system in a timely and effective manner. At present, domestic and foreign researches on partial discharge monitoring and monitoring technology are basically aimed at specific power equipment in substations. The main detection principles and methods used include pulse current method, ultra high frequency (UHF, Ultra High Frequency) method, ultrasonic method , chemical method, optical method, etc. Among them, UHF method and ultrasonic method are more practical and feasible methods. [0003] At present, the partial discharge monitoring and positioning of substation equipment is mainly carried out for specific single equipment...

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Problems solved by technology

However, since the sensor receiving the discharge signal is set far away from the device under test, and the discharge signal will continue to attenuate in the air, this method is only suitable for relatively obvious partial discharge monitoring and positioning

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