阅读说明：本技术 一种基于相角差法检测染污绝缘子憎水性的系统和方法 (System and method for detecting hydrophobicity of contaminated insulator based on phase angle difference method ) 是由 阳林 郝艳捧 况志强 孙艺杰 毕继凯 廖一帆 张福增 于 2019-08-28 设计创作，主要内容包括：本发明属于一种基于相角差法检测染污绝缘子憎水性的系统,包括：蒸汽锅炉、气候罐、测量电路、监测标定绝缘子表面污秽电导率单元和示波器；所述监测标定绝缘子表面污秽电导率单元包括依次连接的数据采集单元和数据处理单元；蒸汽锅炉,设置在气候罐一侧的下端,用于产生热雾至气候罐；将待测染污复合绝缘子悬挂在气候罐内,待测染污复合绝缘子的表面布置铜导电胶,作为测量电极,测量电极和测量电路连接。本发明通过测量待测染污复合绝缘子蒸汽锅炉一开始加雾到相角差值保持不变的时间t,定量判断绝缘子的憎水等级,提高了憎水等级识别的准确度,进一步完善了现有的绝缘子人工污秽试验方法。(the invention belongs to a system for detecting hydrophobicity of a contaminated insulator based on a phase angle difference method, which comprises the following steps: the device comprises a steam boiler, a climate tank, a measuring circuit, a unit for monitoring and calibrating the surface contamination conductivity of the insulator and an oscilloscope; the unit for monitoring and calibrating the surface contamination conductivity of the insulator comprises a data acquisition unit and a data processing unit which are sequentially connected; the steam boiler is arranged at the lower end of one side of the climate tank and is used for generating hot mist to the climate tank; the method comprises the steps of suspending a to-be-measured polluted composite insulator in a climate tank, arranging copper conductive adhesive on the surface of the to-be-measured polluted composite insulator to serve as a measuring electrode, and connecting the measuring electrode with a measuring circuit. According to the invention, the time t from the beginning of fogging of the steam boiler of the polluted composite insulator to be detected to the moment when the phase angle difference value is kept unchanged is measured, the hydrophobic grade of the insulator is quantitatively judged, the accuracy of hydrophobic grade identification is improved, and the existing insulator artificial pollution test method is further perfected.)

1. The utility model provides a system for detect hydrophobicity of contaminated insulator based on phase angle difference method which characterized in that includes: the device comprises a steam boiler, a climate tank, a measuring circuit, a unit for monitoring and calibrating the surface contamination conductivity of the insulator and an oscilloscope; the unit for monitoring and calibrating the surface contamination conductivity of the insulator comprises a data acquisition unit and a data processing unit which are sequentially connected;

The steam boiler is arranged at the lower end of one side of the climate tank and is used for generating hot mist to the climate tank; the method comprises the steps that a to-be-detected polluted composite insulator is hung in a climate tank, copper conductive adhesive is arranged on the surface of the to-be-detected polluted composite insulator and serves as a measuring electrode, the measuring electrode is connected with a measuring circuit, the measuring circuit is further connected with a data acquisition unit, and a data processing unit is further connected with an oscilloscope.

2. A method for detecting the hydrophobicity of a contaminated composite insulator by using the system for detecting the hydrophobicity of a contaminated insulator based on the phase angle difference method as claimed in claim 1, comprising the following steps:

S1, sequentially measuring the time from the beginning of the steam boiler fogging to the time when the phase angle difference value is kept unchanged for different calibration insulators with known hydrophobic grades by using the system to obtain a fitting formula; the fitting equation is a function of the hydrophobicity grade with respect to the time;

s2, measuring the time t from the beginning of the mist adding of the steam boiler to the time when the phase angle difference value is kept unchanged by using the system and the experimental conditions used in the step S1 for the contaminated composite insulator to be measured;

And S3, substituting the time t into a fitting formula to obtain the hydrophobic grade of the contamination composite insulator to be detected.

3. The method according to claim 2, wherein step S1 includes:

S11, cleaning the calibration insulator for later use;

S12, arranging copper conductive adhesive on the surface of the calibration insulator to serve as a measuring electrode;

s13, uniformly coating dirt with a preset salt ash density value on the surface of the calibration insulator, airing and respectively allowing the hydrophobicity of the calibration insulator to migrate for different times; sequentially judging the hydrophobic grade of the calibration insulator according to a water spraying classification method;

and S14, measuring the time from the beginning of the mist adding of the steam boiler to the time when the phase angle difference value is kept unchanged by using the system to transfer the calibration insulators at different times, and obtaining a fitting formula.

4. the method according to claim 3, wherein step S14 comprises:

And measuring the time from the beginning of the fogging of the steam boiler to the time when the phase angle difference value is kept unchanged by using the system, obtaining a fitting curve about the hydrophobic grade and the time, and obtaining a fitting formula according to the fitting curve.

5. the method of claim 2, wherein in step S1, the experimental conditions for measuring the time from the beginning of the fogging of the steam boiler to the time when the phase angle difference is kept constant by using the system are that the ambient temperature is 30 ℃ ± 2 ℃, the humidity is 60% ± 5%, and the hot fogging of the steam boiler is 0.077 kg/h-m ³.

6. The method according to claim 2, wherein in step S2, the time t from the beginning of the fogging of the steam boiler to the time when the phase angle difference is kept constant is observed by an oscilloscope.

Technical Field

The invention belongs to the technical field of detection of performance of a calibration insulator of a power transmission line, and particularly relates to a system and a method for detecting hydrophobicity of a contaminated insulator based on a phase angle difference method.

background

with the rapid development of economy in China, the problem of air pollution is more serious. Atmospheric pollutants floating in the air are adsorbed on the surface of the calibration insulator under the comprehensive action of gravity, electric field force and the like. Under the severe conditions of rain, fog, dew, ice melting, snow melting and the like, the dirt on the surface of the calibration insulator is damped, so that the electrical strength of the calibration insulator is greatly reduced, and pollution flashover accidents are easy to happen. The external insulation pollution flashover becomes a great threat to the safe operation of the power system.

The silicone rubber composite calibration insulator shows excellent antifouling performance due to the hydrophobicity and the hydrophobic migration property, and is widely used in power grids in China. However, as the operating time increases, the gradual aging of the silicone rubber material and the continuous deposition of dirt can reduce or even lose the hydrophobicity of the surface of the calibration insulator, which directly results in the great reduction of the pollution resistance level. Therefore, it is very important to periodically perform the hydrophobicity detection work of the composite calibration insulator.

the current measuring method for the hydrophobicity of the composite calibration insulator mainly comprises a contact angle method, a surface tension method and a water spraying grading method. The contact angle method can only test a flat plate sample with a simple shape, requires a strict test environment, and can hardly be used in the field. When the contact angle measurement is carried out on the composite calibration insulator string, a small umbrella skirt or a small sheath needs to be cut out to be used as a sample. In addition, when the hydrophobicity of a polluted sample is measured, the phenomenon of contact angle retardation of water drops can occur. The surface tension method is rarely used, and the feasibility of measuring a dirty sample and the cumulative effect of multiple measurements need to be further tested. The water spraying classification method is an artificial naked eye judgment method, has large subjective dependence on people and is greatly influenced by artificial factors.

Disclosure of Invention

In order to solve the problem of low accuracy in the prior art, the invention provides a system and a method for detecting hydrophobicity of a contaminated insulator based on a phase angle difference method.

The technical scheme adopted by the invention for solving the technical problems is as follows:

a system for detecting hydrophobicity of a contaminated insulator based on a phase angle difference method comprises the following steps: the device comprises a steam boiler, a climate tank, a measuring circuit, a unit for monitoring and calibrating the surface contamination conductivity of the insulator and an oscilloscope; the unit for monitoring and calibrating the surface contamination conductivity of the insulator comprises a data acquisition unit and a data processing unit which are sequentially connected; the steam boiler is arranged at the lower end of one side of the climate tank and is used for generating hot mist to the climate tank; the method comprises the steps that a to-be-detected polluted composite insulator is hung in a climate tank, copper conductive adhesive is arranged on the surface of the to-be-detected polluted composite insulator and serves as a measuring electrode, the measuring electrode is connected with a measuring circuit, the measuring circuit is further connected with a data acquisition unit, and a data processing unit is further connected with an oscilloscope.

A method for detecting the hydrophobicity of a contaminated composite insulator by using the system for detecting the hydrophobicity of the contaminated insulator based on the phase angle difference method comprises the following steps:

s1, sequentially measuring the time from the beginning of the steam boiler fogging to the time when the phase angle difference value is kept unchanged for different calibration insulators with known hydrophobic grades by using the system to obtain a fitting formula; the fitting equation is a function of the hydrophobicity grade with respect to the time;

S2, measuring the time t from the beginning of the mist adding of the steam boiler to the time when the phase angle difference value is kept unchanged by using the system and the experimental conditions used in the step S1 for the contaminated composite insulator to be measured;

And S3, substituting the time t into a fitting formula to obtain the hydrophobic grade of the contamination composite insulator to be detected.

Preferably, step S1 includes:

S11, cleaning the calibration insulator for later use;

s12, arranging copper conductive adhesive on the surface of the calibration insulator to serve as a measuring electrode;

S13, uniformly coating dirt with a preset salt ash density value on the surface of the calibration insulator, airing and respectively allowing the hydrophobicity of the calibration insulator to migrate for different times; sequentially judging the hydrophobic grade of the calibration insulator according to a water spraying classification method;

And S14, measuring the time from the beginning of the mist adding of the steam boiler to the time when the phase angle difference value is kept unchanged by using the system to transfer the calibration insulators at different times, and obtaining a fitting formula.

Preferably, step S14 includes: and measuring the time from the beginning of the fogging of the steam boiler to the time when the phase angle difference value is kept unchanged by using the system, obtaining a fitting curve about the hydrophobic grade and the time, and obtaining a fitting formula according to the fitting curve.

preferably, in step S1, the experimental conditions for measuring the time from the beginning of the fogging of the steam boiler to the time when the phase angle difference is kept constant by using the system are that the ambient temperature is 30 ℃ ± 2 ℃, the humidity is 60% ± 5%, and the hot fogging of the steam boiler is at a flow rate of 0.077kg/h · m ³.

Preferably, in step S2, the time t from the beginning of the fogging of the steam boiler to the time when the phase angle difference remains constant is observed by an oscilloscope.

the invention has the beneficial effects that:

According to the invention, the time t from the beginning of fogging of the steam boiler of the polluted composite insulator to be detected to the moment when the phase angle difference value is kept unchanged is measured, the hydrophobic grade of the insulator is quantitatively judged, the accuracy of hydrophobic grade identification is improved, and the existing insulator artificial pollution test method is further perfected.

Drawings

the invention is further illustrated with reference to the following figures and examples.

FIG. 1 is a block diagram of a system for detecting hydrophobicity of a contaminated insulator based on a phase angle difference method according to the present invention;

Fig. 2 is a schematic flow chart of the method for detecting the hydrophobicity of the contaminated insulator based on the phase angle difference method.

Detailed Description

The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic views illustrating only the basic structure of the present invention in a schematic manner, and thus show only the constitution related to the present invention.

referring to fig. 1, a system for detecting hydrophobicity of a contaminated insulator based on a phase angle difference method includes: the device comprises a steam boiler 11, a climate tank 12, a measuring circuit 13, a unit 14 for monitoring and calibrating the electrical conductivity of the dirt on the surface of the insulator and an oscilloscope 15; the unit 14 for monitoring and calibrating the surface contamination conductivity of the insulator comprises a data acquisition unit and a data processing unit which are sequentially connected; a steam boiler 11 provided at a lower end of one side of the climate tank 12 for generating hot mist to the climate tank 12; the method comprises the steps that a to-be-detected polluted composite insulator is hung in a climate tank 12, copper conductive adhesive is arranged on the surface of a to-be-detected polluted composite insulator 16 and serves as a measuring electrode, the measuring electrode is connected with a measuring circuit 13, the measuring circuit 13 is further connected with a data acquisition unit, and a data processing unit is further connected with an oscilloscope 15.

it should be noted that the measuring circuit 13 and the unit 14 for monitoring and calibrating the conductivity of the surface contamination of the insulator both adopt the invention patent "a system for monitoring the conductivity of the contamination on the surface of the insulator" which has been applied by the subject group, and the patent number is 201310689364. The measuring electrode is connected to a unit 14 for monitoring and calibrating the surface contamination conductivity of the insulator through a measuring circuit, the unit 14 for monitoring and calibrating the surface contamination conductivity of the insulator obtains a signal source voltage signal and a constant value resistance voltage signal from the measuring unit, the two signals respectively obtain a phase angle difference of the two signals through a data processing unit, and the data processing unit is further connected with an oscilloscope 15. The oscilloscope 15 displays the phase angle difference.

Referring to fig. 2, a method for detecting hydrophobicity of a contaminated composite insulator by using the system comprises the following steps:

S1, sequentially measuring the time from the beginning of the mist adding of the steam boiler 11 to the time when the phase angle difference value is kept unchanged for different calibration insulators with known hydrophobic grades by using the system to obtain a fitting formula; the fitting equation is a function of the hydrophobicity grade with respect to the time; specifically, step S1 includes:

S11, cleaning the calibration insulator for later use;

S12, arranging copper conductive adhesive on the surface of the calibration insulator to serve as a measuring electrode;

S13, uniformly coating dirt with a preset salt ash density value on the surface of the calibration insulator, airing and respectively allowing the hydrophobicity of the calibration insulator to migrate for different times; sequentially judging the hydrophobic grade of the calibration insulator according to a water spraying classification method;

S14, the system is used for measuring the time from the beginning of the mist adding of the steam boiler 11 to the time when the phase angle difference value is kept unchanged during the migration of the calibration insulators at different times, and a fitting formula is obtained. Table 1 shows the time t for which the phase angle difference θ remains substantially constant for different hydrophobic grades, specifically, step S14 includes: the system is utilized to measure the time from the beginning of the mist adding of the steam boiler 11 to the constant phase angle difference value of the calibration insulator migrating at different time, a fitting curve about the hydrophobic grade and the time is obtained, and a fitting formula is obtained according to the fitting curve.

TABLE 1 time t (min) for which the phase angle difference theta remains substantially constant for different hydrophobic grades

Wherein the experimental conditions are that the ambient temperature is 30 ℃ plus or minus 2 ℃, the humidity is 60 percent plus or minus 5 percent, and the flow rate of the hot mist of the steam boiler 11 is 0.077 kg/h.m ³.

S2, measuring the time t from the beginning of the mist adding of the steam boiler 11 to the unchanged phase angle difference value of the contaminated composite insulator 16 to be measured by using the system and the experimental conditions used in the step S1; in step S2, the time t from the start of the fogging of the steam boiler 11 to the time when the phase angle difference is kept constant is observed by the oscilloscope 15.

and S3, substituting the time t into a fitting formula to obtain the hydrophobic grade of the contamination composite insulator 16 to be detected.

In light of the foregoing description of the preferred embodiment of the present invention, many modifications and variations will be apparent to those skilled in the art without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.