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Power cable connector construction normalization detection method based on temperature measurement

A power cable and temperature measurement technology, which is applied in the field of normative detection of power cable joint construction based on temperature measurement, can solve the problems of single temperature detection of cable joints, failure to detect and judge cable defects, and failure to detect temperature distribution, etc., to achieve practicality. Strong, simple detection, small calculation effect

Active Publication Date: 2014-03-19
STATE GRID CORP OF CHINA +1
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Problems solved by technology

[0004] At present, the fault detection of cable joints is a single temperature detection, that is, it only cares whether the temperature exceeds the critical threshold, and does not detect its specific temperature distribution.
This monitoring method can only play a certain alarm role when the cable joint has a fault symptom after a period of operation, but cannot detect and judge the cable defect from the process quality at the beginning of the cable joint operation.

Method used

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  • Power cable connector construction normalization detection method based on temperature measurement
  • Power cable connector construction normalization detection method based on temperature measurement
  • Power cable connector construction normalization detection method based on temperature measurement

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Embodiment

[0047] Such as figure 1 As shown, a cylindrical coordinate system is established with the cable axis as the axis according to the right-hand screw rule, and the azimuth angle of the lowest point of the cable φ=0. Take 5 cross-sections 2 from left to right on the cable connector, and each cross-section boundary is on the , Π / 3, 2π / 3, π, 4π / 3, 5π / 3 take six temperature measurement points.

[0048] Measure the temperature T at each temperature measurement point (i,j) At present, the commonly used temperature sensing elements mainly include infrared thermometers, thermocouples, thermal resistances, semiconductor PN junctions, temperature-controlled thyristors and integrated circuit temperature sensors. Among them, the specific temperature measurement form is uncertain, and only the temperature of each point is required. (i,j) The measurement accuracy of at least T (i,j) 0.01% of the maximum value.

[0049] Calculate the average temperature of each single section temperature measuremen...

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Abstract

The invention relates to the field of power cable connector construction normalization detection, and particularly relates to a power cable connector construction normalization detection method based on temperature measurement. According to the power cable connector construction normalization detection method, a cable connector temperature measurement dot matrix is arranged and the temperature of each point is measured through a sensor with the accuracy meeting certain requirement so that the temperature distribution condition of the surface of a cable connector is obtained, and correlation coefficients which represents the temperature distribution uniformity degree of various sections, such as the relative deviation and k-order error norm of the temperature of the boundary temperature-measuring points of the sections, are further calculated; the relation between the correlation coefficients and cable connector construction process quality is obtained according to simulating calculation or experience. The power cable connector construction normalization detection method disclosed by the invention can be used for judging the defect condition of the cable connector in the aspect of the normalization of a construction process and providing the reference for the service life forecast of the cable connector through the detection of the temperature distribution of the cable connector and has the advantages of simple detection process, small calculated amount and high practicability.

Description

Technical field [0001] The invention relates to the field of standard detection of power cable joint construction, in particular to a method for standard detection of power cable joint construction based on temperature measurement. Background technique [0002] Cross-linked polyethylene cables are widely used in power transmission lines because of their excellent performance. However, the length of the cable production is generally below 1000m, and cable joints are required to connect the cables. Cable joints are an important accessory of power cables and also a weak link in the entire cable line. Research in recent years has shown that with the gradual improvement of the quality of the cable itself, the proportion of accidents caused by various cable joints in power cable accidents is increasing, and more than 50% of the accidents occur on cable joints. Due to the complicated production process of cable joints, the process requirements are high. Irregular construction has made...

Claims

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Application Information

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IPC IPC(8): G01B21/24
Inventor 刘兴华咸日常孙学峰陈素红杨磊杨帆
Owner STATE GRID CORP OF CHINA
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