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Local discharge monitoring method for multiple intensively arranged power equipment

A technology for partial discharge monitoring and power equipment, applied in the field of monitoring, to achieve the effects of ensuring safe operation, reducing power outage accidents in the whole station, and improving online synchronous monitoring capabilities

Active Publication Date: 2015-07-01
STATE GRID CORP OF CHINA +2
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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

Method used

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  • Local discharge monitoring method for multiple intensively arranged power equipment
  • Local discharge monitoring method for multiple intensively arranged power equipment

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Embodiment Construction

[0026] The partial discharge monitoring method for centralized arrangement of multi-power equipment according to the present invention will be further explained below in conjunction with specific embodiments and accompanying drawings.

[0027] Such as figure 1 As shown, this embodiment synchronously monitors the partial discharge of a plurality of centrally arranged electric equipment through the following method:

[0028] Set up a high-frequency shielded bus ring 1 in the substation, the length of the high-frequency shielded total ring line is not more than 100m, and install sensing terminals 3 on each power equipment in the substation, and these sensing terminals are respectively connected with the high-frequency shielded bus ring in parallel contacts 2 Parallel connection, and the distance between two adjacent parallel connections is not less than 3m. Each sensing terminal includes a UHF sensor 31 and a UHF broadband amplifier 32 (with a gain of 40dB) connected sequentiall...

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Abstract

The invention discloses a local discharge monitoring method for multiple intensively arranged power equipment. The local discharge monitoring method comprises the following steps: setting a high-frequency mask bus ring, and arranging multiple parallel connection points on the high-frequency mask bus ring; respectively and correspondingly mounting multiple sensing terminals on the power equipment in a substation; connecting a two-channel data collection unit with the high-frequency mask bus ring so as to enable local discharge signals monitored by the sensing terminals to be transmitted to the two-channel data collection unit through a first path and a second path respectively along the high-frequency mask bus ring; setting a length difference between the first path and the second path corresponding to the parallel connection points to be different values so as to generate different time differences; and positioning the local discharge signals according to the different time differences. According to the local discharge monitoring method, the multiple intensively arranged power equipment needing to be monitored in the whole substation can be synchronously monitored in an on line manner, and discovering and removing insulation defects of the power equipment in time so as to improve safety running of the whole substation.

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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/12
Inventor 孙承超胡岳高鹏路钱勇盛戈皞江秀臣
Owner STATE GRID CORP OF CHINA
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