Temperature measurement system for high voltage switchgear circuit connection structure

Abstract

The present invention discloses a temperature measurement system for a circuit connection structure of a high-voltage switchgear, comprising a conductive metal element, an insulating heat-conducting element, a temperature measurement guide wire and a temperature display and acquisition device; the conductive metal element is used to transmit the temperature of the connection structure to the insulating heat-conducting element, one end of the insulating heat-conducting element is connected to the conductive metal element, and the other end is connected to the temperature display and acquisition device through the temperature measurement guide wire. In the temperature measurement system, the temperature of the connection structure can be transmitted to the temperature measurement guide wire via the conductive metal element and the insulating heat-conducting element, and the temperature measurement guide wire converts the temperature signal into an electrical signal and transmits it to the temperature display and acquisition device to display the temperature in real time, so that the staff can monitor the temperature in real time, so that corresponding processing can be carried out in time when abnormal heating occurs, thereby improving the safety of equipment operation. In addition, since the insulating heat-conducting element does not need to be connected to a power source separately, passive transmission of temperature can be achieved.

Description

Technical Field

[0001] The invention relates to the technical field of high-voltage equipment, and in particular to a temperature measurement system for a loop connection structure of a high-voltage switchgear. Background Art

[0002] In order to ensure the safe operation of the power system, the thermal fault diagnosis of high-voltage equipment has received widespread attention. For the circuit connection structure of high-voltage equipment, such as high-voltage switches, the contact resistance of the contacts increases, overload, etc., causing the joint temperature to be too high, resulting in heating. This heating phenomenon will cause continuous aging or even breakdown, thereby causing short circuits, forming major accidents, and causing greater economic losses. However, in the prior art, the abnormal heating of the circuit connection structure of the high-voltage equipment cannot be detected in time during operation, affecting the safety and reliability of the operation of the power system.

[0003] Therefore, how to detect abnormal heating in time is a technical problem that technicians in this field need to solve at present. Summary of the invention

[0004] In view of this, an object of the present invention is to provide a temperature measurement system for a circuit connection structure of a high-voltage switchgear, so as to facilitate staff to promptly detect abnormal heating of the connection structure.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A temperature measurement system for a high-voltage switchgear circuit connection structure comprises a conductive metal element, an insulating heat-conducting element, a temperature measurement guide wire and a temperature display and acquisition device; the conductive metal element is used to transmit the temperature of the connection structure to the insulating heat-conducting element, one end of the insulating heat-conducting element is connected to the conductive metal element, and the other end is connected to the temperature display and acquisition device through the temperature measurement guide wire.

[0007] Preferably, the conductive metal element is connected between the contact box and the insulating heat-conducting element.

[0008] Preferably, one end of the conductive metal element is connected to an insulator to which the bus conductor is connected, and the other end is connected to the insulating heat-conducting element.

[0009] Preferably, it also includes a data monitoring main unit electrically connected to the output end of the temperature display and collection device, and the data monitoring main unit is provided with a remote device interface.

[0010] Preferably, the conductive metal element is a copper-based metal strip.

[0011] Preferably, the insulating thermally conductive element is any one of a SiC ceramic thermally conductive element, an AlN ceramic thermally conductive element, and a BeO ceramic thermally conductive element.

[0012] Preferably, the temperature measuring guide wire is a thermocouple transmission line.

[0013] Preferably, the temperature display and collection device comprises a linear temperature sensor and an alarm electrically connected to an output end of the linear temperature sensor, wherein the alarm is used to sound an alarm when the temperature detected by the linear temperature sensor is greater than a set temperature.

[0014] Preferably, the conductive metal element and the insulating heat-conducting element are fastened with insulating bolts and insulating adhesive.

[0015] Preferably, the insulating heat-conducting element is connected to the connecting structure through a mounting hole, and a gap between the insulating heat-conducting element and the mounting hole is filled with insulating material.

[0016] The temperature measurement system of the high-voltage switchgear circuit connection structure provided by the present invention comprises a conductive metal element, an insulating heat-conducting element, a temperature measurement guide wire and a temperature display and collection device; the conductive metal element is used to transmit the temperature of the connection structure to the insulating heat-conducting element, one end of the insulating heat-conducting element is connected to the conductive metal element, and the other end is connected to the temperature display and collection device through the temperature measurement guide wire.

[0017] In the temperature measurement system of the high-voltage switchgear circuit connection structure, the temperature of the connection structure can be transmitted to the temperature measurement guide wire through the conductive metal element and the insulating heat-conducting element. The temperature measurement guide wire converts the temperature signal into an electrical signal and transmits it to the temperature display acquisition device to display the temperature in real time, so that the staff can monitor the temperature in real time, so that when abnormal heating occurs, corresponding processing can be carried out in time to improve the safety of equipment operation. In addition, since the insulating heat-conducting element does not need to be connected to a power source separately, passive transmission of temperature can be achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0019] Figure 1 This is a structural diagram of the temperature measurement system for the circuit connection structure of the high-voltage switchgear provided by the present invention;

[0020] Figure 2 for Figure 1 The local structure diagram of .

[0021] Reference numerals:

[0022] Insulating heat-conducting element 1, connecting structure 2, conductive metal element 21, temperature measuring guide wire 3, temperature display and collection device 4, temperature data monitoring main unit 5, RS485 bus 6, insulating material 7. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] The core of the present invention is to provide a temperature measurement system for the circuit connection structure of a high-voltage switchgear, so that the staff can find the abnormal heating of the connection structure in time.

[0025] It should be noted that when an element is referred to as "fixing" another element, it may be directly on the other element or there may also be a centered element. When an element is considered to be "connected" to another element, it may be directly connected to the other element or there may be a centered element at the same time. The orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0026] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0027] In a specific embodiment of the temperature measurement system for the high-voltage switchgear circuit connection structure provided by the present invention, please refer to Figure 1 , including a conductive metal element 21, an insulating heat-conducting element 1, a temperature measuring guide line 3 and a temperature display and collection device 4.

[0028] The connection structure 2 to be measured for temperature is a contact box, more specifically a high-voltage switch contact box. Optionally, the high-voltage switch contact box is a switch dynamic and static contact box with a voltage level of 10kV to 35kV. The conductive metal element 21 is connected to the contact box to transfer the temperature of the contact box structure to the insulating thermal conductive element 1. One end of the insulating thermal conductive element 1 is connected to the conductive metal element 21, and the other end is connected to the temperature display and collection device 4 through the temperature measurement guide line 3. The insulating thermal conductive element 1 is specifically a high-voltage insulating thermal conductive element. The conductive metal element 21 can be set to a columnar, filamentary, strip or other shape as needed, specifically a copper-based metal strip.

[0029] In the temperature measurement system of the high-voltage switchgear circuit connection structure provided in this embodiment, the temperature of the connection structure 2 can be transmitted to the temperature measurement guide line 3 through the conductive metal element 21 and the insulating heat-conducting element 1. The temperature measurement guide line 3 converts the temperature signal into an electrical signal and transmits it to the temperature display acquisition device 4 to display the temperature in real time, so that the staff can monitor the temperature in real time, so that corresponding processing can be carried out in time when abnormal heating occurs, thereby improving the safety of equipment operation. In addition, since the insulating heat-conducting element 1 does not need to be connected to a power source separately, passive transmission of temperature can be achieved.

[0030] Furthermore, the temperature measurement system also includes a data monitoring unit 5 electrically connected to the output end of the temperature display and collection device 4, and the two are specifically connected via an RS232 bus or an RS485 bus 6. The data monitoring unit 5 is provided with a remote device interface, which can be specifically connected to terminal devices such as mobile phones and tablet computers, or to the substation integrated automation system via the network, so as to further facilitate the monitoring work of the staff.

[0031] Further, the insulating thermal conductive element 1 is any one of a Sic ceramic thermal conductive element, an AlN ceramic thermal conductive element, and a BeO ceramic thermal conductive element. The main performance indicators of such insulating thermal conductive element 1 are: voltage breakdown strength ≥ 17kV / m; bending strength ≥ 330Mpa; thermal conductivity (coefficient) ≥ 170Wmk; excellent thermal conductivity, low dielectric constant and dielectric loss, reliable insulation performance, excellent mechanical properties, non-toxic, high temperature resistance, and chemical corrosion resistance.

[0032] In addition, the length of the insulating thermal conductive element 1 is determined according to different voltage levels. Specifically, the length of the 10kV voltage level is 5-15mm, the length of the 35kV voltage level is 15-35mm, the length of the 110kV voltage level is 20-40mm, and the length of the 220kV voltage level is 35-55mm.

[0033] Furthermore, the temperature measurement guide line 3 is a thermocouple transmission line with high measurement accuracy and stable performance, and more specifically is a thermocouple wire transmission line of model pt-100.

[0034] Furthermore, the temperature display and acquisition device 4 includes a linear temperature sensor and an alarm electrically connected to the output end of the linear temperature sensor, and the alarm is used to alarm when the temperature detected by the linear temperature sensor is greater than the set temperature, so that the on-site staff can find abnormal heating in time. Optionally, the operating temperature of the linear temperature sensor is suitable for -50℃~200℃, and the preset temperature of the alarm is 95℃. More specifically, the temperature display and acquisition device 4 is a multi-channel temperature display automatic acquisition detector, which is arranged in the instrument box inside the high-voltage switch cabinet.

[0035] Furthermore, the conductive metal element 21 and the insulating heat-conducting element 1 are fastened with insulating bolts and insulating adhesive, and the insulating heat-conducting element 1 is connected to the connecting structure 2 through the mounting hole, and the gap between the insulating heat-conducting element 1 and the mounting hole is filled with insulating material 7, such as epoxy resin, quartz powder and other materials with high insulation performance. For details, please refer to Figure 2 , a mounting hole is directly provided on the connection structure 2, and one end of the insulating heat-conducting element 1 extends into the mounting hole to connect the conductive metal element 21. After the connection, the gap between the mounting hole and the connection structure 2 is filled with insulating material 7 to ensure the insulation performance of the connection. Of course, as long as the temperature conduction between the insulating heat-conducting element 1 and the connection structure can be smoothly carried out, in other embodiments, the mounting hole can also be provided on other structures connected to the connection structure 2. For example, when the connection structure is a bus conductor, the mounting hole can be provided on an insulator supporting the bus conductor.

[0036] In this embodiment, the high-voltage equipment is specifically a high-voltage switch cabinet in the distribution network system, and the high-voltage switch contact box is arranged in the high-voltage switch cabinet. The working principle is that the heat on the high-voltage switch contact box is transferred to the insulating heat-conducting element 1 through the copper-based metal strip, and then to the temperature display and collection device 4 installed near the contact box base via the thermocouple transmission line, and then transmitted to the data monitoring main unit 5 via the RS232 bus. The remote receiving and control center can compare the historical data of the temperature of multiple contact boxes, timely discover potential accidents, and timely alarm.

[0037] In this embodiment, the heat of the target temperature measurement point is sampled by high-voltage insulation overlap, and the heat is transferred backward through the insulating thermal conductive element 1. Then, the temperature display and collection device 4 is used on the non-electric side of the insulating thermal conductive element 1 to realize accurate monitoring of the high-voltage side temperature. The insulating thermal conductive element 1 does not require power supply, which greatly improves the reliability, simplifies the method of monitoring temperature in the high voltage field, and improves the feasibility. It can effectively perform real-time temperature monitoring of power equipment for a long time without frequent replacement, has low manufacturing cost, and is easy to promote.

[0038] Of course, in other embodiments, the connection structure 2 can also be a bus conductor, that is, a busbar in a high-voltage device, to monitor abnormal heat generated at the busbar. Specifically, one end of the conductive metal element 21 is connected to the insulator connected to the bus conductor, and the other end is connected to the insulating thermal conductive element 1.

[0039] Of course, in other embodiments, the temperature measurement guide line 3 can also be an optical fiber, and the temperature detection is realized by using the fiber grating temperature measurement principle. Accordingly, an optical demodulator is provided in the temperature display and collection device 4.

[0040] In addition, in other embodiments, the high-voltage device may also be a circuit breaker.

[0041] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0042] The above is a detailed introduction to the temperature measurement system of the circuit connection structure of the high-voltage switchgear provided by the present invention. Specific examples are used in this article to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A temperature measurement system for a high-voltage switchgear circuit connection structure, characterized in that: It comprises a conductive metal element (21), an insulating heat-conducting element (1), a temperature measuring guide wire (3) and a temperature display and collection device (4); the conductive metal element (21) is used to transmit the temperature of the connection structure to the insulating heat-conducting element (1); one end of the insulating heat-conducting element (1) is connected to the conductive metal element (21), and the other end is connected to the temperature display and collection device (4) through the temperature measuring guide wire (3); The conductive metal element (21) is connected between the contact box and the insulating heat-conducting element (1); It also includes a data monitoring main unit (5) electrically connected to the output end of the temperature display and collection device (4), and the data monitoring main unit (5) is provided with a remote device interface; The conductive metal element (21) is a copper-based metal strip; The insulating heat-conducting element (1) is any one of a SiC ceramic heat-conducting element, an AlN ceramic heat-conducting element, and a BeO ceramic heat-conducting element; The temperature measurement guide line (3) is a thermocouple transmission line; The temperature display and collection device (4) comprises a linear temperature sensor and an alarm electrically connected to the output end of the linear temperature sensor, wherein the alarm is used to sound an alarm when the temperature detected by the linear temperature sensor is greater than a set temperature; The conductive metal element (21) and the insulating heat-conducting element (1) are fastened with insulating bolts and insulating adhesive; The insulating heat-conducting element (1) is connected to the connection structure (2) via a mounting hole, and an insulating material (7) is filled in a gap between the insulating heat-conducting element (1) and the mounting hole.

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