CN210071944U - Current-carrying lead thermal performance parameter measuring device - Google Patents
Current-carrying lead thermal performance parameter measuring device Download PDFInfo
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- CN210071944U CN210071944U CN201920729482.2U CN201920729482U CN210071944U CN 210071944 U CN210071944 U CN 210071944U CN 201920729482 U CN201920729482 U CN 201920729482U CN 210071944 U CN210071944 U CN 210071944U
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- insulating layer
- lead wire
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Abstract
The utility model relates to a current-carrying lead wire thermal behavior parameter measurement device belongs to power transformer thermal behavior research technical field. The technical scheme is as follows: burying 10-20 thermocouples at different positions on the surface of the lead conductor in the thickness direction of the insulating layer and in the transformer oil, and leading out lead wires of the thermocouples along the length direction of the lead wires; the lead wire support is fixedly arranged in the oil groove, and a lead wire of the thermocouple is fixed on the lead wire support; the two ends of the lead are connected with a power supply through power lines, the lead-out wire of the thermocouple is connected with a measuring instrument, and the transformer oil is injected into the oil groove; after the power supply is switched on, the thermocouple is used for measuring the temperature of the surface of the electric conductor, different positions of the insulating layer and the transformer oil. The utility model discloses a measure the temperature of lead wire electric conductor surface, the different positions of insulating layer and transformer oil with the thermocouple, calculate thermal performance parameters such as lead wire temperature rise, insulating material's coefficient of heat conductivity according to the measuring result, for control lead wire hot point temperature rise, prevent to produce local overheat and provide powerful technical support.
Description
Technical Field
The utility model relates to a current-carrying lead wire thermal behavior parameter measurement device belongs to power transformer thermal behavior research technical field.
Background
For a large high-voltage power transformer, the current of a lead wire is up to thousands of amperes or even tens of thousands of amperes, if the lead wire is positioned in a high magnetic field area, larger eddy current loss can be generated, and the high-voltage lead wire needs to be wrapped with an insulating layer of 5-20mm according to the voltage level. If the lead configuration is not reasonable or in a high magnetic field area, local overheating on the lead may occur, which may lead to transformer failure. Therefore, controlling the temperature rise of the hot spot of the lead and preventing the local overheating become one of the key technologies of the high-voltage large-scale power transformer. The temperature rise of the hot point of the lead can be calculated and controlled by adopting a lead thermal simulation technology, the thermal performance parameters of the lead are required to be input when the lead thermal simulation is carried out, and a device is required to obtain the thermal performance parameters of the current-carrying lead.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a current-carrying lead wire thermal performance parameter measurement device, through the temperature with thermocouple measurement lead wire conductor surface, the different positions of insulating layer and transformer oil, calculate according to the temperature measurement result and draw thermal performance parameters such as lead wire temperature rise, insulating material's coefficient of heat conductivity, lead wire surface heat dissipation coefficient, solved the above-mentioned problem that exists effectively among the background art.
The technical scheme of the utility model is that: a current-carrying lead thermal performance parameter measuring device comprises an oil groove, a lead bracket, a lead, a power line, a thermocouple and transformer oil, wherein the transformer oil is injected into the oil groove; the lead comprises an electric conductor and an insulating layer, and the package is arranged outside the electric conductor; the number of the thermocouples is more than one, the thermocouples are embedded in different positions on the surface of the lead conductor in the thickness direction of the insulating layer and in the transformer oil, and the leading-out wires of the thermocouples are led out along the length direction of the leads; the lead wire support is fixedly arranged in the oil groove, and the lead wire of the thermocouple is fixed on the lead wire support; the two ends of the lead are connected with a power line through bolts, the power line is connected with a power supply, and the lead-out wire of the thermocouple is connected with a measuring instrument.
The number of the thermocouples is 10-20, 7-9 thermocouples are buried in the surface of the lead conductor, and the distance between temperature sensing points on the surfaces of the adjacent thermocouple conductors is 150mm (millimeters); 1 thermocouple is buried every 2-3mm along the thickness direction of the insulating layer, and the temperature sensing point of the insulating layer is close to the middle part of the length direction of the lead; 3-5 thermocouples are buried in the transformer oil at a position 10mm away from the surface of the lead insulating layer.
The conductor of the lead is a pure copper bar with the length of 1200-1500mm and the diameter of phi 20-phi 50, two ends of the conductor are in a flattened shape and provided with wiring holes; the thickness of the insulating layer is 10-20 mm.
The utility model has the advantages that: the thermocouple is used for measuring the temperature of the surface of the lead conductor, different positions of the insulating layer and transformer oil, and the thermal performance parameters such as the temperature rise of the lead, the thermal conductivity coefficient of the insulating material, the surface heat dissipation coefficient of the lead and the like are calculated according to the temperature measurement result, so that powerful technical support is provided for controlling the temperature rise of the hot point of the lead and preventing local overheating.
Drawings
FIG. 1 is a schematic structural diagram of a current-carrying lead thermal performance parameter measuring device according to the present invention;
FIG. 2 is a schematic diagram of the embedding position of the thermocouple of the present invention;
in the figure: the device comprises an oil tank 1, a lead support 2, a lead 3, a power line 4, a thermocouple 5, transformer oil 6, an insulating layer 7, a thermocouple conductor surface temperature sensing point 8, an insulating layer temperature sensing point 9, a power supply 10, a measuring instrument 11 and a transformer oil temperature sensing point 12.
Detailed Description
The technical solution of the present invention will be further described in detail with reference to the accompanying drawings and embodiments.
A current-carrying lead thermal performance parameter measuring device comprises an oil groove 1, a lead bracket 2, a lead 3, a power line 4, a thermocouple 5 and transformer oil 6, wherein the transformer oil 6 is injected into the oil groove 1; the lead 3 comprises an electric conductor and an insulating layer 7, and is wrapped and arranged outside the electric conductor; the number of the thermocouples 5 is more than one, the thermocouples are embedded in different positions of the surface of the electric conductor of the lead 3 in the thickness direction of the insulating layer 7 and in the transformer oil, and the leading-out wires of the thermocouples 5 are led out along the length direction of the lead 3; the lead wire support 2 is fixedly arranged in the oil groove 1, and the lead wire of the thermocouple 5 is fixed on the lead wire support 2; two ends of the lead 3 are connected with a power line 4 through bolts, the power line 4 is connected with a power supply 10, and an outgoing line of the thermocouple 5 is connected with a measuring instrument 11.
The number of the thermocouples 5 is 10-20, 7-9 thermocouples 5 are embedded on the surface of the lead 3 electric conductor, and the distance between the temperature sensing points 8 on the surface of the adjacent thermocouple conductors is 150 mm; 1 thermocouple 5 is buried every 2-3mm along the thickness direction of the insulating layer, and the temperature sensing point 9 of the insulating layer is close to the middle part of the length direction of the lead 3; 3-5 thermocouples 5 are embedded in the transformer oil at a position 10mm away from the surface of the lead insulation layer.
The conductor of the lead 3 is a pure copper bar with the length of 1200-1500mm and the diameter of phi 20-phi 50, and both ends of the conductor are in a flattened shape and are provided with wiring holes; the thickness of the insulating layer 7 is 10-20 mm.
The specific implementation mode is that ① lead electrical conductors are pure copper rods with the lengths of 1200-1500mm and phi 20-phi 50, two ends of each copper rod are flattened, planes are milled and wiring holes are punched, insulating paper is coated outside the copper rods by 5-20mm, ② 7-9 thermocouples are embedded on the surfaces of the lead conductors in the process that the lead is coated with an insulating layer, the distance between temperature sensing points on the surfaces of adjacent thermocouple conductors is about 150mm, 1 thermocouple is embedded at intervals of 2-3mm in the thickness direction of the insulating layer, the temperature sensing points of the insulating layer are close to the middle position in the length direction of the lead, 3-5 thermocouples are embedded in transformer oil at the position 10mm away from the surface of the lead insulating layer, lead wires of the thermocouples are led out in the length direction of the lead, ③ the lead support is installed and fixed inside an oil groove, then the lead wires with the embedded thermocouples are fixed on the lead support, two ends of the lead wires of ④ are connected with a power supply through bolts, the power supply is connected with the power supply, lead wires of the thermocouple are connected with the transformer oil, then transformer oil is injected into the oil groove, after the power supply is connected with the power supply, the lead wires, the heat dissipation coefficient of the lead wires is measured, the temperature of the lead wires, the relationship between the temperature of the lead wires is.
Claims (3)
1. A current-carrying lead thermal performance parameter measuring device is characterized in that: the transformer oil tank comprises an oil tank (1), a lead wire bracket (2), a lead wire (3), a power wire (4), a thermocouple (5) and transformer oil (6), wherein the transformer oil (6) is injected into the oil tank (1); the lead (3) comprises an electric conductor and an insulating layer (7), and is wrapped and arranged outside the electric conductor; the number of the thermocouples (5) is more than one, the thermocouples are embedded in different positions of the surface of the electric conductor of the lead (3) in the thickness direction of the insulating layer (7) and in the transformer oil, and the leading-out wires of the thermocouples (5) are led out along the length direction of the lead (3); the lead wire support (2) is fixedly arranged in the oil groove (1), and the lead wire of the thermocouple (5) is fixed on the lead wire support (2); two ends of the lead (3) are connected with a power line (4) through bolts, the power line (4) is connected with a power supply (10), and a leading-out wire of the thermocouple (5) is connected with a measuring instrument (11).
2. A device as claimed in claim 1, wherein the thermal performance parameters of the current carrying lead are measured by: the number of the thermocouples (5) is 10-20, 7-9 thermocouples (5) are embedded on the surface of the electric conductor of the lead (3), and the distance between temperature sensing points (8) on the surface of the adjacent thermocouple conductors is 150 mm; 1 thermocouple (5) is buried every 2-3mm along the thickness direction of the insulating layer, and the temperature sensing point (9) of the insulating layer is close to the middle part of the length direction of the lead (3); 3-5 thermocouples (5) are embedded in the transformer oil at a position 10mm away from the surface of the lead insulating layer.
3. A device as claimed in claim 1, wherein the thermal performance parameters of the current carrying lead are measured by: the conductor of the lead (3) is a pure copper bar with the length of 1200 and 1500mm and the diameter of phi 20-phi 50, and both ends of the conductor are in a flattened shape and are provided with wiring holes; the thickness of the insulating layer (7) is 10-20 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920729482.2U CN210071944U (en) | 2019-05-21 | 2019-05-21 | Current-carrying lead thermal performance parameter measuring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920729482.2U CN210071944U (en) | 2019-05-21 | 2019-05-21 | Current-carrying lead thermal performance parameter measuring device |
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| CN210071944U true CN210071944U (en) | 2020-02-14 |
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| CN201920729482.2U Active CN210071944U (en) | 2019-05-21 | 2019-05-21 | Current-carrying lead thermal performance parameter measuring device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110082604A (en) * | 2019-05-21 | 2019-08-02 | 保定天威保变电气股份有限公司 | A kind of current carrying lead Thermal Parameter measuring device and measuring method |
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2019
- 2019-05-21 CN CN201920729482.2U patent/CN210071944U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110082604A (en) * | 2019-05-21 | 2019-08-02 | 保定天威保变电气股份有限公司 | A kind of current carrying lead Thermal Parameter measuring device and measuring method |
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