Overheating alarm wire clamp

Abstract

The invention provides an overheating alarm wire clamp, relates to the field of electric equipment, and is used for solving the problem of overheating monitoring and alarming for wire clamp faults in the power grid operation. The overheating alarm wire clamp is advantaged in that 1, false alarm and omission is avoided, and the operation workload is reduced; 2, the service life is long; 3, the appearance and construction of the conventional wire clamp can be maintained, and energy conversation and environmental protection can be achieved; 4, the alarm state can be maintained; 5, the alarm indication is obvious; 6, there is no increase in the installation steps, and simplicity and firmness are achieved; 7, the heat conduction link is omitted, and the detection precision tolerance is smaller than + / - 1 DEG C; 8, the structure is simple and the cost is cheap; and 9, maintenance is not needed. The wire clamp conductor is internally provided with at least one cylindrical hole in which a spring and a warning cloth which is worn at the end of the spring are compressed. The hole opening is sealed with a low-melting-point alloy cap. When the wire clamp is heated to the melting point of the low-melting-point alloy, the low-melting-point alloy cap is melted, and the warning cloth is sprung out of the hole and unfolded, warning overheating of the wire clamp.

Description

technical field [0001] The invention relates to the field of electric equipment, in particular to an overheat alarm clip. Background technique [0002] Wire clamps are usually used to connect wires on electric overhead lines. Due to equipment design, product quality, construction quality, operating conditions, operating years and other reasons, some clamps may have poor contact and abnormal heating. According to the requirements of existing equipment operating procedures and specifications, abnormal heating of wire clips is a defect, and major and urgent defects need to be repaired as soon as possible, otherwise the wires may be blown, causing equipment or even large-scale power outages, with serious consequences. [0003] Although the root cause of the clamp heating is the abnormal increase of the contact resistance of the clamp, it is also closely related to changing factors such as load current, wind speed, ambient temperature and sunshine. When the most unfavorable fact...

AI Technical Summary

Problems solved by technology

However, if this technical solution is applied to transmission and distribution lines, there will be the following disadvantages: 1. The warning is not obvious

The height of the transmission line tower is generally tens of meters, and the area of ​​the memory metal is too small, so it is difficult to be observed by the naked eyes of the underground patrol personnel in the pop-up state

2. There is no tight seal between the base and the upper cover, and the warning color painted on the surface is easy to fade if exposed to wind and rain in the wild for a long time

3. The temperature tolerance of the material is usually above 10°C, and the accuracy of temperature measurement is not high enough

There are deficiencies in this technical solution: 1. The red indicator flag is not tightly sealed. If it is exposed to wind and rain in the wild, the warning color on the surface will fade easily after a long time; 2. The temperature tolerance of the material is usually above 10°C. The accuracy of the temperature measurement is not high enough; 3. The volume is large and the mechanism is complicated. It is used on high-voltage transmission lines, which is prone to corona and radio interference.

However, this solution still has the following deficiencies: 1. When newly installing and putting into production equipment, in addition to wire clips, an additional alarm device needs to be purchased and installed, which increases the management and construction links. For field high-altitude operations, the cost is high ,Can not be ignored

2. The parts that the alarm device needs to be connected with the existing clamps have the risk of heat transfer loss at the connection, and the installation is not firm enough

3. The alarm device needs to be connected with the existing cable clip and an independent shell package, which increases the product cost

This technical solution has the following deficiencies: 1. Usually, the size of the wire clip is about 100 mm, limited by the volume of the wire clip, the length of the indicating rod is about 100 mm, and the section is smaller, so it is easy to be blocked by the wire and the wire clip. , even if it is not blocked, the installation height of the clamps of the general tower line is greater than 10 meters, and it is very difficult for the inspectors to find the indicator pole on the ground

The bimetal sheet is heated and deformed to push the mechanism to be in a normal state of motion. In the case of no waterproof and dustproof working conditions, how to ensure the working reliability of the cable clamp within a service life of about 30 years is not further specifically provided in this technical solution. Technical solutions are difficult for professional and technical personnel to understand and implement

According to the operation experience, the probability of heating of the cable clamp is at the level of 0.1%. If the reliability of the alarm device cannot be higher than that of the cable clamp, false alarms will be a high probability event, and the practicability of the alarm device will be compromised.

3. Since the device is not completely sealed, water and dust will enter the device when used in the field, which poses a threat to the components that require precise motion control, and will make it difficult to meet the scrapping period of overhead power equipment, usually 20 to 30 years.

[0010] In order to realize the overheating alarm on the connection parts of the high-voltage transmission and distribution lines, the following problems need to be solved: 1. The working reliability of the monitoring equipment must be higher than that of the connection parts of the high-voltage transmission and distribution lines, otherwise the malfunction will be higher than the equipment heating failure More frequent, cannot reduce the workload of operation

2. The equipment must be durable, otherwise it will be replaced frequently, and the construction cost of high-altitude operations will be high

3. The volume of the monitoring equipment should be small enough, and the shape should be smooth, otherwise it will protrude too much outside the conductor, and corona discharge will easily occur, resulting in excessive radio interference and audible noise.

8. The thermal resistance between the heat-sensitive part of the monitoring device and the heating part of the wire clip should be small enough, otherwise, in the high-altitude windy state, the temperature difference between the heat-sensitive part and the monitored equipment is too large, and the accuracy will drop

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