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A sensor for directly contacting and measuring the temperature of high-voltage objects

An object and direct technology, applied in the field of sensors, can solve the problems of high electric field strength of the sensor, excessively large medium and high switch cabinets, damage to the insulation of the sensor and the object to be measured, etc., to achieve the effect of overcoming the low level of insulation

Active Publication Date: 2019-03-05
TOP DIRECTION LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This sensor size is too large for practical applications
[0005] Patent No. 200610050793.3 "Medium and High Voltage Switch Contact Temperature Sensor" describes a temperature sensor that uses a ceramic insulating heat transfer base as the insulation protection of the sensor probe. Like the above-mentioned patent No. ZL200420055437.7, because its metal shielding shell is at ground potential, As a result, when the insulating heat transfer base is in contact with the high-voltage object machine, the distance between the high-voltage object and the metal shielding shell is greater than 100 mm, and this size is too large for medium and high switch cabinets.
[0006] Another obvious shortcoming of the above four technologies is that the metal signal wires and thermoelectric conversion elements of the sensor directly contacting the high-voltage object are at low potential. The same voltage level as the contacted high-voltage object, which makes the potential difference between the internal circuit of the sensor and the outside of the sensor equal to the voltage level of the high-voltage occasion, because the thickness of the thermal insulator that wraps the internal circuit of the sensor cannot be made larger, so that the sensor If the electric field strength on the outer surface of the sensor is too high, a discharge phenomenon will occur in the air, and the long-term discharge phenomenon will damage the insulation between the sensor and the measured object

Method used

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  • A sensor for directly contacting and measuring the temperature of high-voltage objects
  • A sensor for directly contacting and measuring the temperature of high-voltage objects
  • A sensor for directly contacting and measuring the temperature of high-voltage objects

Examples

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Embodiment 1

[0023] Such as figure 1 As shown, a sensor for directly contacting and measuring the temperature of a high-voltage object includes a polymer insulator 2, an insulating and heat-conducting ceramic body 1, a thermoelectric conversion element 5, a ground shielding sleeve 7, an electrical signal wire 6, and a metal heat-conducting layer 4; The heat-conducting ceramic body 1 is located in the polymer insulator 2. The function of the polymer insulator 2 is to form sufficient insulation distance and insulation thickness to ensure the insulation between the internal circuit of the sensor and the high-voltage measured object, and the insulating heat-conducting ceramic The body 1 is provided with an inner hole for placing the thermoelectric conversion element 5, and the surface of the inner hole is coated with a conductive layer 8, that is, the conductive layer 8 can be considered to be provided at the contact between the insulating and heat-conducting ceramic body 1 and the thermoelectr...

Embodiment 2

[0027] Such as figure 2 As shown, the overall technical solution of Embodiment 2 is basically the same as that of Embodiment 1, including a polymer insulator 2, an insulating and heat-conducting ceramic body 1, a metal heat-conducting layer 4, a thermoelectric conversion element 5, a ground shielding sleeve 7, an electrical signal wire 6, and a conductive layer 8; the difference is that the insulating and heat-conducting ceramic body 1 is located in the middle of the polymer insulator 2, and the polymer insulator 2 is also provided with a metal connector 10 for connecting the measured object, and the metal connector The part 10 is connected with the metal heat-conducting layer 4. While being used to connect the measured object, it also acts as a substitute for the pressure equalizing shield, shielding the gap between the measured object and the sensor, so that the outer surface of the sensor does not There will be discharge phenomena in which the air is ionized such as corona...

Embodiment 3

[0029] Such as image 3 As shown, the overall technical solution of embodiment 3 is basically the same as that of embodiment 1, including insulating and heat-conducting ceramic body 1, polymer insulator 2, voltage equalizing shield 3, metal heat-conducting layer 4, thermoelectric conversion element 5, electrical signal wire 6, grounding Shielding sleeve 7 and conductive layer 8; the difference is: when the object to be measured or the position to be measured is located inside the polymer insulator 2, such as when the object to be measured in this embodiment is a T-shaped structure, the high Molecular insulator 2 is a T-shaped tubular structure, which is coated on the outside of the object to be measured, and the metal heat-conducting layer 4 is located between the object to be measured and the insulating and heat-conducting ceramic body 1; the polymer insulator 2 The outer side is provided with a ground shielding layer 9, and the ground shielding layer 9 is bonded to the outer...

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Abstract

The invention relates to a sensor for directly contacting and measuring the temperature of a high voltage object. The sensor comprises a high-molecular insulator, an insulating heat conduction ceramic body, a thermoelectric conversion element, a grounding shielding housing, an electrical signal wire and a metal heat conduction layer, wherein the insulating heat conduction ceramic body is arranged in the high-molecular insulator, and is provided with the thermoelectric conversion element; a contact surface between the insulating heat conduction ceramic body and the thermoelectric conversion element is coated with a conducting layer; the grounding shielding housing is connected with the conducting layer; the electrical signal wire is connected with the thermoelectric conversion element; one end of the insulating heat conduction ceramic body is provided with the metal heat conduction layer; the insulating heat conduction ceramic body is arranged at one internal end of the high-molecular insulator; and a voltage-sharing shielding layer is formed at the periphery of the metal heat conduction layer. The sensor for directly contacting and measuring the temperature of a high voltage object is provided with the ability for bearing high voltage, and can overcome the problems that a sensor in the prior art is low in insulation level and the connection part between the sensor and a high voltage object to be detected is liable to discharge phenomenon caused by high voltage field intensity, such as corona and flashover.

Description

technical field [0001] The invention relates to a sensor, in particular to a sensor for directly contacting and measuring the temperature of a high-voltage object in a high-voltage state. Background technique [0002] In order to continuously detect the temperature of high-voltage objects in high-voltage electrical equipment, the insulation problem of the temperature sensor in the long-term operation must be solved; the existing temperature sensors are classified according to whether they are in contact with the measured object during measurement, and can be divided into direct contact measurement And non-direct contact measurement; non-direct contact measurement method, there is no insulation problem, such as infrared measurement, but the cost of infrared measurement equipment is very high, if continuous detection is required, the cost will be higher; direct contact measurement is divided into wired signal Transmission and wireless signal transmission; the method of wireles...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01K7/04
CPCG01K7/023G01K7/04
Inventor 林韶光
Owner TOP DIRECTION LTD