Multi-parameter intelligent identification system of high-voltage dry-type bushing and application

Abstract

The invention belongs to the technical field of parameter identification of insulating dry type bushings in power equipment and discloses a multi-parameter intelligent identification system and application of a high-voltage dry type bushing. The multi-parameter intelligent identification system is provided with transformer bushings, an integrated miniature broadband micro-current sensor, a temperature-pressure composite sensor and optical fiber communication; the transformer bushings, the integrated miniature broadband micro-current sensor, the temperature-pressure composite sensor and the optical fiber are synchronously triggered to form a cascade structure, multiple bushings can synchronously acquire multiple parameters, and meanwhile, the optical fiber is used for data transmission, so external electromagnetic interference can be inhibited. According to the system, synchronous acquisition of various parameters is realized, data transmission is carried out by using the optical fiber, and external electromagnetic interference can be effectively inhibited. The system is advantaged in that a magnetic core and a coil of the sensor are optimally designed, so the sensor has relatively high bandwidth and sensitivity at the same time, and meanwhile, the size of the sensor is greatly reduced.

Description

technical field [0001] The invention belongs to the technical field of parameter identification of insulating dry-type bushings in power equipment, and in particular relates to a multi-parameter intelligent identification system and application of high-voltage dry-type bushings. Background technique [0002] At present, the transformer is the main component of the power transmission system and the key equipment of the power grid. The safety and reliability of the transformer is one of the conditions that determine the stable operation of the power system. The bushing is an important part of the large current and high voltage input or output in the metal box of the transformer. The fault identification of the bushing is the weak link of the transformer. Since the fault process of the bushing is not easy to identify, the defect will cause the bushing to fail. In severe cases, it may even lead to failure of the entire transformer. [0003] In recent years, the failure rate of...

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Problems solved by technology

[0006] (1) Common fault analysis and handling methods require personnel to attend maintenance, with few monitoring points and low frequency. If the problem is not found in time, it is likely to pose a major threat to the safety of personnel on duty and equipment

[0007] (2) The dry-type transformer temperature control system with uninterrupted power supply in the prior art has a single monitoring parameter, and it is difficult to realize online analysis of multi-parameter integration due to interface limitations of different subsystems

[0008] The difficulty in solving the above problems and defects is: the problem in the existing technology is that the current casing operation and maintenance is still based on regular preventive tests, the test period is long, and the occurrence of casing failures is sporadic, resulting in preventive The test cannot obtain the early indication signal of casing failure in time, so the occurrence of casing failure cannot be effectively avoided

[0009] In practical applications, it is impossible to obtain a large number of non-destructive characteristic parameters and breakdown voltage of various dry bushings, and it is difficult to solve this problem in terms of economics and operational difficulty.

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