CN107885921A - Composite insulator rod core aging evaluation method - Google Patents

Abstract

The present invention relates to a kind of composite insulator rod core aging evaluation method of 110KV voltage class insulators that are particularly suitable for use in.It is characterized in, infrared spectrum analysis is carried out to composite insulator rod core, extracts the height of composite insulator major absorbance peak, and the degree of aging of composite insulator rod core is evaluated using SVMs；The infrared spectrum analysis needs composite insulator rod core being fabricated to the test specimen that thickness is 1.5mm, and the major absorbance peak includes hydroxyl group (OH), alkyl group (CH₃), carbonyl group (C=O), the SVMs foundation need first against a kind of certain fixing model composite insulator rod core evaluation model, recycle model parameter the composite insulator rod core sample of the model is evaluated.The composite insulator rod core aging evaluation method of the present invention can be classified for the composite insulator of different ageing states and state estimation, instructs operation maintenance personnel to safeguard composite insulator.

Description

Aging Evaluation Method of Composite Insulator Rod Core

technical field

The invention relates to a composite insulator rod core aging evaluation method which is especially suitable for 110KV voltage grade insulators.

Background technique

Composite insulators are one of the key equipment for the operation of power systems, and they are used for supporting protection and electrical insulation. Composite insulator rod core is mainly composed of epoxy resin, which belongs to a kind of thermosetting polymer oligomer organic matter, which has the characteristics of good mechanical properties, stable size, good electrical properties and stable chemical properties. However, since the composite insulator itself operates in a natural environment and is subjected to long-term temperature changes, ultraviolet rays, rain and snow, etc., aging linearity will inevitably occur. The aging of the composite insulator rod core will reduce its mechanical properties and cause brittle fracture accidents, which will pose a serious threat to the stable operation of the power system. Therefore, it is of great significance to evaluate the aging of composite insulator cores.

Chinese patent CN201210167361.6 discloses a composite insulator core aging evaluation method, by making the core material into a sample and measuring the trap energy level and trap charge of the sample to evaluate the aging degree of the composite insulator core. This method can characterize the aging degree of composite insulator cores to a certain extent, but the equipment used is relatively complex, and the data is random, so the evaluation accuracy needs to be improved, and it is not sensitive to the early aging degree of composite insulator cores.

Contents of the invention

The purpose of the present invention is to provide a method for evaluating the aging of composite insulator cores, which can accurately evaluate the aging degree of composite insulators, provide reliable assistance for operation and maintenance personnel, and effectively ensure the safe operation of power equipment.

A method for evaluating the aging of a composite insulator rod core is characterized in that it includes the following steps:

(1) Select the same type of composite insulators in three states of health, general and severe aging, and select at least 10 composite insulators in each state;

(2) Strip off the shed and sheath of the composite insulator, take out the core of the composite insulator, and make the core into a circular sheet;

(3) The circular slice is placed in an infrared spectrometer, and its infrared absorption spectrum is measured, and the absorption peaks of hydroxyl group-OH, hydrocarbon group- _CH3 and carbonyl group-C=O are recorded respectively;

(4) Divide all sample measurement results into two groups, in which the measurement results in the severe state of aging are divided into one group, and the measurement results in the healthy state and general state are divided into another group, and the two groups of samples are used to train the support first vector machine model, so that the first vector machine model can distinguish whether the rod core is in a serious state of aging;

(5) Divide the measurement results of rod cores in a healthy state and rod cores in a normal state into two groups, wherein those in a healthy state are divided into one group, and those in a normal state are divided into another group. Using these two groups of samples training the second support vector machine model, so that the second vector machine model can distinguish whether the rod core is in a healthy state;

(6) The composite insulator rod core to be tested is made into a circular sheet sample, and an infrared spectrometer is used to measure the absorption peaks of the hydroxyl group-OH, hydrocarbon group- _CH3 and carbonyl group-C=O of the circular sheet sample respectively;

(7) According to the obtained sample measurement results, use the first vector machine model established in step (4) to judge whether the sample to be tested is in a serious state of aging, if yes, then determine that the sample is in a serious state of aging, if not, use step (5) The established second vector machine model judges whether the sample to be tested is in a healthy state, if yes, it is judged that the sample is in a healthy state, and if not, it is judged that the sample is in a normal state.

Select 10 composite insulators in each state in step (1).

The thickness of the circular flakes in step (2) is 1.5 mm, and the thickness of the circular flake samples in step (6) is 1.5 mm.

The beneficial effects of the present invention are: 1. The equipment required by the composite insulator core aging evaluation method proposed by the invention is simple, and the measured characteristic parameters can accurately characterize the aging degree of the composite insulator core, thereby improving the accuracy of the evaluation 2. The method of the present invention combines intelligent algorithms, which is more sensitive to the state of the composite insulator rod core, and can distinguish the aging degree of the insulator rod core in different states. At the same time, the measuring equipment used is simple and the physical meaning is relatively clear.

Detailed ways

The invention provides a method for evaluating the aging of a composite insulator rod core, which includes performing infrared spectrum analysis on the composite insulator rod core, extracting the height of the main absorption peak of the composite insulator, and evaluating the aging degree of the composite insulator rod core by using a support vector machine; The infrared spectrum analysis needs to make the composite insulator rod core into a test sample with a thickness of 1.5 mm, and the main absorption peaks include hydroxyl group (-OH), hydrocarbon group (-CH ₃ ), carbonyl group (-C=O) , the establishment of the support vector machine needs to first aim at the evaluation model of a fixed type of composite insulator rod core, and then use the model parameters to evaluate the type of composite insulator rod core sample.

According to the above scheme, the composite insulator core aging evaluation method can classify and evaluate the composite insulators in different aging states, and guide the operation and maintenance personnel to maintain the composite insulators.

In order to make the purpose, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not constitute a conflict with each other.

Example 1:

A method for evaluating the aging of composite insulator rod cores, including performing infrared spectrum analysis on composite insulator rod cores, extracting the height of the main absorption peak of composite insulators, and evaluating the aging degree of composite insulator rod cores by using a support vector machine; the infrared spectrum The analysis needs to make the composite insulator rod core into a test sample with a thickness of 1.5mm. The main absorption peaks include hydroxyl groups (-OH), hydrocarbon groups (-CH ₃ ), and carbonyl groups (-C=O). The establishment of the vector machine needs to firstly evaluate the evaluation model of a fixed type of composite insulator rod core, and then use the model parameters to evaluate the composite insulator rod core sample of this type

The absorption peaks are all characteristic parameters of the infrared spectrum absorption peaks that change significantly during the aging process of the rod core material, and can better characterize the aging degree of the composite insulator rod core.

The support vector machine needs to measure the data of composite insulator rod cores of specific models with different aging degrees, train the model, and realize the evaluation of the aging degree through multiple binary classifications.

The aging assessment method provided in this embodiment includes the following steps:

(1) Select 10 composite insulator rod cores of the same type, including healthy, general, and serious aging;

(2) Strip off the shed and sheath of the composite insulator, take out the core material of the composite insulator, and make it into a circular sheet with a thickness of 1.5mm;

(3) Place the circular slice in an infrared spectrometer, measure its infrared absorption spectrum, and record the absorption of each sample including hydroxyl group (-OH), hydrocarbon group (-CH ₃ ), carbonyl group (-C=O) peak-to-peak value;

(4) Divide the measurement results of all samples into two groups: the measurement results of severe aging are divided into one group, and the measurement results of health and general are divided into one group, and the support vector machine model 1 is trained by using the two groups of samples. Whether the core is seriously aged;

(5) Divide the measurement results of healthy rod cores and general rod cores into two groups: a healthy group and a general group, and use the two groups of samples to train the support vector machine model 2, which can distinguish whether the rod is in a healthy state ;

(6) The core of the composite insulator to be tested is made into a sample with a thickness of 1.5 mm, and the absorption of the hydroxyl group (-OH), hydrocarbon group (-CH ₃ ) and carbonyl group (-C=O) of the rod core is measured by an infrared spectrometer peak-to-peak value;

(7) Use the model established in step (4) to judge whether the test sample is in a stage of severe aging, if yes, then determine that the sample is seriously aged, if not, continue to use model 2 to judge whether the test sample is in a healthy state, if yes, then The sample is judged to be in a healthy state, if not the sample is in a normal state.

Apparently, the above-mentioned embodiments are only examples for clearly illustrating the present invention, rather than limiting the implementation of the present invention. For those skilled in the art, other changes or modifications can be made on the basis of the above description. It is not necessary to exhaustively list all implementation manners here. And these derived changes belonging to the present invention are still within the protection scope of the present invention.

Claims (3)

1. A composite insulator rod core aging evaluation method, is characterized in that, comprises the steps: (1) Select the same type of composite insulators in three states of health, general and severe aging, and select at least 10 composite insulators in each state; (2) Strip off the shed and sheath of the composite insulator, take out the core of the composite insulator, and make the core into a circular sheet; (3) The circular slice is placed in an infrared spectrometer, and its infrared absorption spectrum is measured, and the absorption peaks of hydroxyl group-OH, hydrocarbon group- _CH3 and carbonyl group-C=O are recorded respectively; (4) Divide all sample measurement results into two groups, in which the measurement results in the severe state of aging are divided into one group, and the measurement results in the healthy state and general state are divided into another group, and the two groups of samples are used to train the support first vector machine model, so that the first vector machine model can distinguish whether the rod core is in a serious state of aging; (5) Divide the measurement results of rod cores in a healthy state and rod cores in a normal state into two groups, wherein those in a healthy state are divided into one group, and those in a normal state are divided into another group. Using these two groups of samples training the second support vector machine model, so that the second vector machine model can distinguish whether the rod core is in a healthy state; (6) The composite insulator rod core to be tested is made into a circular sheet sample, and an infrared spectrometer is used to measure the absorption peaks of the hydroxyl group-OH, hydrocarbon group- _CH3 and carbonyl group-C=O of the circular sheet sample respectively; (7) According to the obtained sample measurement results, use the first vector machine model established in step (4) to judge whether the sample to be tested is in a serious state of aging, if yes, then determine that the sample is in a serious state of aging, if not, use step (5) The established second vector machine model judges whether the sample to be tested is in a healthy state, if yes, it is judged that the sample is in a healthy state, and if not, it is judged that the sample is in a normal state. 2. The composite insulator rod core aging evaluation method according to claim 1, characterized in that: in step (1), 10 composite insulators in each state are selected. 3. The composite insulator rod core aging evaluation method according to claim 1, characterized in that: the thickness of the circular slice in step (2) is 1.5 mm, and the thickness of the circular slice sample in step (6) is 1.5 mm.