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Transformer insulation life loss calculation method

A technology of insulation life and calculation method, applied in the field of transformers, can solve the problems of decreased mechanical strength, decreased electrical strength and mechanical strength, decreased mechanical strength of insulating paper, etc., to reduce downtime, ensure power supply, and eliminate hidden dangers.

Pending Publication Date: 2020-05-08
SHIJIAZHUANG KE IOT TECH CO LTD +1
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Problems solved by technology

As for insulating paper, during the aging process, its electrical strength and mechanical strength will decrease and the insulating paper cannot be replaced, and the decline in mechanical strength is particularly obvious.
In addition, a large number of studies have found that the root cause of most transformers out of service due to the aging of their insulation is that the mechanical strength of the insulating paper is reduced and cannot support sufficient insulation

Method used

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  • Transformer insulation life loss calculation method
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Embodiment Construction

[0019] The invention provides a calculation method for transformer insulation life loss, which includes the following steps.

[0020] a. IEC60076-7 guidelines give the hot spot temperature life calculation formula: Θ HST =Θ a +ΔΘ T0 +ΔΘ W . Among them, Θ HST is the hot spot temperature; Θ a is ambient temperature; ΔΘ T0 is the top oil temperature rise; ΔΘ W is the temperature difference between the hot spot temperature and the top oil temperature.

[0021] IEEE Std C57.91-1995 guideline gives the definition of transformer insulation life aging factor under rated load and reference temperature Since the Arrhenius model is suitable for the case where the temperature range is not large, if the temperature range changes greatly, the model will produce errors, and it is necessary to adjust F ins Make corrections. The revised formula:

[0022] in, Θ HST is the hot spot temperature, the unit is °C, K is the Boltzmann constant, K=8.617×10 -5 , f is the real-time oper...

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Abstract

The invention discloses a transformer insulation life loss calculation method, and belongs to the technical field of transformers. The method comprises two steps of correcting an insulation life agingfactor of the transformer and calculating the insulation life loss of the transformer. The method has the advantages that by monitoring the key data of the running state of the transformer, the insulation life loss can be accurately calculated, and then the remaining life and the overall running state of the transformer are predicted; operation and maintenance personnel are helped to make accurate and efficient decisions in time, customers are helped to arrange product maintenance in a planned mode, the number of products needing to be replaced is accurately provided, and product inventory isreduced; potential hazards are effectively eliminated through timely judgment, downtime is shortened, and power supply is ensured.

Description

technical field [0001] The invention belongs to the technical field of transformers, and in particular relates to a calculation method for transformer insulation life loss. Background technique [0002] Large-scale power transformers are the main equipment in the power system and the core equipment of the substation. They are responsible for the important task of power transmission in the system. Its operating status is directly related to the safe operation of the system. The key to running. [0003] The reliable operation life of the transformer is determined by the state of its insulation structure, and the main insulation structure of the transformer is oil-paper composite insulation, which has a long history and has been proved to be very suitable for the insulation of high-voltage power equipment. Due to the influence of various external effects, For example, the load and temperature of the transformer during operation, the insulating paper and insulating oil will gra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/20G06F119/04
CPCY04S10/50
Inventor 李春海陈贺刘海涛王强陈洪雨翟志国崔振伟刘晓龙郭立敏刘立锋芦斌
Owner SHIJIAZHUANG KE IOT TECH CO LTD
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