CN-122017356-A - Thermal resistance measurement method, system, equipment and medium for ice melting process of ice-covered insulated conductor

CN122017356ACN 122017356 ACN122017356 ACN 122017356ACN-122017356-A

Abstract

The invention relates to the technical field of ice melting and discloses a thermal resistance measurement method, a system, equipment and a medium in an ice melting process of an ice-covered insulated wire, wherein the method comprises the steps of arranging the insulated wire in a temperature-controllable refrigeration house, connecting two ends of the insulated wire with an ice melting test power supply, removing an insulating layer near one end of the wire, and connecting the insulating layer to a voltage measuring line; the method comprises the steps of arranging a plurality of infrared temperature measuring units at intervals along the axial direction in the middle section of a wire, aligning the outer surface of the wire and being in the same horizontal plane, collecting the surface temperature of the wire at fixed time intervals through an infrared temperature measuring control module, synchronously recording the voltage drop and the power supply output current of the wire at fixed sampling frequency through a voltage and current measuring system, applying constant ice melting power after uniform ice coating is formed, recording temperature, voltage and current data in the whole process, calculating thermal resistance, conductor real-time temperature, dynamic internal and external temperature difference and dynamic ice melting thermal resistance in unit length on the basis of the data on a time-by-time basis, and further determining insulation layer thermal resistance, thermal conductivity and natural convection heat exchange coefficient.

Inventors

YANG HAO
LI XINHAO
HAO SHUQING
CAI YONGXIANG
MIAO YU
ZHANG HENGRONG
FU YU
XIAO XIAOBING
WU PENG
LI YI
JIANG FUGUO
LEI YIYONG
HE PENG
ZHANG SONG
WENG DI
GUO DAO
ZHAO LEI
ZHAO YINGHU
LIU FU
Xun Yukai
LI YUE
LIU ANJIANG
OUYANG GUANGZE
ZHOU LIN
XU YUTAO
DOU CHEN
ZHENG YOUZHUO

Assignees

贵州电网有限责任公司

Dates

Publication Date: 20260512
Application Date: 20251230

Claims (10)

1. The method for measuring the thermal resistance in the ice melting process of the ice-coated insulated wire is characterized by comprising the following steps of: Arranging a section of insulated wire in a temperature-controllable refrigeration house; connecting ice melting test power supplies at two ends of the insulated wire, respectively removing surface insulating layers at two positions near one end of the insulated wire, and accessing to a measuring line of a voltage measuring system; A plurality of infrared temperature measuring units are axially arranged at intervals in the middle section of the insulated wire, and each infrared temperature measuring unit is aligned to the outer surface of the ice-covered insulated wire and is positioned at the same horizontal plane with the center of the wire; configuring the infrared temperature measuring unit to acquire temperature data of the outer surface of the ice-covered insulated wire at fixed time intervals; and configuring a voltage and current measurement system to synchronously record voltage drop data of the insulated wire and current data output by the ice melting test power supply at a fixed sampling frequency.
2. The method for measuring thermal resistance in ice melting process of ice-covered insulated wire as claimed in claim 1, further comprising: Regulating the temperature of the refrigeration house to a preset low temperature, and forming a uniform ice coating layer on the surface of the insulated wire in the voltage measurement section in a spraying mode until the thickness of the ice coating layer reaches a preset thickness; Selecting a corresponding direct current test current from a preset current parameter table as an initial ice melting current according to the conductor sectional area of the insulated wire; and calculating constant ice melting power based on the initial ice melting current, the conductor cross-section area and the conductor length, and configuring an ice melting test power supply to output the constant ice melting power.
3. The method for measuring thermal resistance in ice melting process of ice-covered insulated wire as claimed in claim 2, further comprising: starting an ice melting test power supply to continuously output the ice melting test power supply with constant ice melting power; synchronously recording the temperature data of the outer surface of the ice-covered insulated wire, which are acquired by the infrared temperature measuring unit, the voltage data acquired by the voltage measuring system and the current data acquired by the current measuring system; After the ice coating is completely melted, temperature data, voltage data and current data in the whole ice melting process are stored.
4. A method of measuring thermal resistance during ice melting of an insulated wire of claim 3, further comprising: And calculating the thermal resistance value of the insulated wire with unit length at the corresponding moment according to the voltage data and the current data recorded at each moment at fixed time intervals, wherein the thermal resistance value is determined by the voltage value, the current value and the wire length at the moment.
5. The method for measuring thermal resistance in ice melting process of ice-covered insulated wire as claimed in claim 4, further comprising: According to the thermal resistance value of unit length, the initial resistance value of the conductor before the ice melting starts, the initial temperature of the conductor before the ice melting starts and the resistance temperature coefficient of the conductor material at the standard temperature, calculating the real-time temperature of the conductor at each moment, wherein the real-time temperature is determined by the initial temperature, the initial resistance value, the current thermal resistance value and the resistance temperature coefficient together.
6. The method for measuring thermal resistance in ice melting process of ice-covered insulated wire of claim 5, further comprising: Carrying out arithmetic average on the outer surface temperature data acquired by the plurality of infrared temperature measuring units at the same moment to obtain the outer surface average temperature of the ice-covered insulated wire at the moment; the difference between the real-time temperature of the conductor at that time and the average temperature of the outer surface is calculated as the dynamic inside-outside temperature difference at that time.
7. The method for measuring thermal resistance in ice melting process of ice-covered insulated wire of claim 6, further comprising: According to the dynamic internal and external temperature difference and the thermal power consumed by the insulated wire in unit length, calculating the dynamic ice melting thermal resistance of the insulated wire in unit length at the moment, wherein the dynamic ice melting thermal resistance is determined by the dynamic internal and external temperature difference and the thermal power in unit length; Further comprises: Taking the value of the dynamic ice melting thermal resistor at the ice melting starting time as an insulating layer thermal resistor; Calculating the heat conductivity coefficient of the insulating layer according to the thermal resistance of the insulating layer, the inner diameter of the conductor and the outer diameter of the insulating layer; Subtracting the insulation layer thermal resistance from the value of the dynamic ice melting thermal resistance at the ice melting end time to obtain a natural convection heat exchange equivalent thermal resistance; and calculating the natural convection heat transfer coefficient according to the natural convection heat transfer equivalent thermal resistance, the ambient temperature, the average temperature of the outer surface of the ice-covered insulated wire at the ice-melting end time and the outer diameter of the ice-covered insulated wire.
8. A thermal resistance measurement system for ice melting process of ice-covered insulated wires, applying the method as claimed in any one of claims 1 to 7, comprising: A temperature-controllable refrigerator; Insulated wires arranged in the refrigerator; the ice melting test power supply is connected with two ends of the insulated wire; the measuring line of the voltage measuring system is connected to two positions near one end of the insulated wire, from which the surface insulating layer is removed; The infrared temperature measuring units are axially arranged at intervals along the middle section of the insulated wire, and each infrared temperature measuring unit is aligned to the outer surface of the insulated wire and is in the same horizontal plane with the center of the wire; The infrared temperature measurement control module is connected with the plurality of infrared temperature measurement units and is configured to collect temperature data of the outer surface of the insulated wire at fixed time intervals; And the voltage and current measurement system is connected with the insulated wire and the ice melting test power supply and is configured to synchronously record voltage drop data of the insulated wire and current data output by the ice melting test power supply at a fixed sampling frequency.
9. An electronic device comprising a memory and a processor, the memory storing a computer program, characterized in that the processor, when executing the computer program, implements the steps of a method for measuring thermal resistance in an ice melting process of an insulated wire covered with ice according to any one of claims 1 to 7.
10. A computer readable storage medium having stored thereon a computer program, wherein the computer program when executed by a processor implements the steps of a method for measuring thermal resistance in an ice-covered insulated wire ice melting process according to any one of claims 1 to 7.

Description

Thermal resistance measurement method, system, equipment and medium for ice melting process of ice-covered insulated conductor Technical Field The invention relates to the technical field of ice melting, in particular to a thermal resistance measurement method, a thermal resistance measurement system, thermal resistance measurement equipment and thermal resistance measurement medium in an ice melting process of an ice-covered insulated wire. Background When the ice-covered insulated wire runs in winter, the ice covering on the surface of the wire is easy to cause the increase of the load of the wire and the decrease of the insulation performance, and the power supply safety is ensured by ice melting. The traditional ice-covered wire ice-melting technology pays attention to ice-melting power output and final ice-melting effect, lacks monitoring on dynamic change of thermal resistance in the ice-melting process, and is difficult to accurately obtain key parameters such as thermal characteristics of an insulating layer, natural convection heat exchange rules and the like. Because the deicing process involves multiple physical processes such as wire heat conduction, icing and melting, environmental heat exchange and the like, the parameter coupling relationship is complex, the traditional method cannot quantify the deicing efficiency and the heat loss distribution, and is difficult to formulate an adaptive deicing scheme aiming at different icing conditions, and even the problems of overheating of the wire or incomplete deicing caused by improper parameter configuration can be caused when the icing thickness is uneven or the environmental temperature fluctuates. Disclosure of Invention The present invention has been made in view of the above-described problems occurring in the prior art. Therefore, the invention provides a thermal resistance measuring method, a system, equipment and a medium for the ice melting process of an icing insulated wire, which can solve the problems that the wire is easy to overheat or the ice melting is not thorough when the icing thickness is uneven or the ambient temperature fluctuates in the prior art. In order to solve the technical problems, the invention provides the following technical scheme: In a first aspect, the invention provides a thermal resistance measurement method in an ice melting process of an ice-covered insulated wire, which comprises the following steps: Arranging a section of insulated wire in a temperature-controllable refrigeration house; connecting ice melting test power supplies at two ends of the insulated wire, respectively removing surface insulating layers at two positions near one end of the insulated wire, and accessing to a measuring line of a voltage measuring system; A plurality of infrared temperature measuring units are axially arranged at intervals in the middle section of the insulated wire, and each infrared temperature measuring unit is aligned to the outer surface of the ice-covered insulated wire and is positioned at the same horizontal plane with the center of the wire; configuring the infrared temperature measuring unit to acquire temperature data of the outer surface of the ice-covered insulated wire at fixed time intervals; and configuring a voltage and current measurement system to synchronously record voltage drop data of the insulated wire and current data output by the ice melting test power supply at a fixed sampling frequency. As a preferable scheme of the method for measuring the thermal resistance in the ice melting process of the ice-covered insulated wire, the method further comprises the following steps: Regulating the temperature of the refrigeration house to a preset low temperature, and forming a uniform ice coating layer on the surface of the insulated wire in the voltage measurement section in a spraying mode until the thickness of the ice coating layer reaches a preset thickness; Selecting a corresponding direct current test current from a preset current parameter table as an initial ice melting current according to the conductor sectional area of the insulated wire; and calculating constant ice melting power based on the initial ice melting current, the conductor cross-section area and the conductor length, and configuring an ice melting test power supply to output the constant ice melting power. As a preferable scheme of the method for measuring the thermal resistance in the ice melting process of the ice-covered insulated wire, the method further comprises the following steps: starting an ice melting test power supply to continuously output the ice melting test power supply with constant ice melting power; synchronously recording the temperature data of the outer surface of the ice-covered insulated wire, which are acquired by the infrared temperature measuring unit, the voltage data acquired by the voltage measuring system and the current data acquired by the current measuring system; After the ice coating is complet