阅读说明：本技术 低压电缆连接头温度在线监测预警系统及方法 (Low-voltage cable connector temperature online monitoring and early warning system and method ) 是由 张鹏程 于 2020-07-15 设计创作，主要内容包括：本发明公开了一种低压电缆连接头温度在线监测预警系统,监测预警系统包括：采集单元；采集单元包括荧光光纤温度传感器,荧光光纤温度传感器安装于电缆连接头处；通讯单元；通讯单元与采集单元建立TCP/IP连接,通讯单元与云端数据库建立无线连接；移动应用服务；基于云端数据库建立用于在移动端推送采集数据的移动应用服务。本发明还公开一种低压电缆连接头温度在线监测预警方法,应用于上述的低压电缆连接头温度在线监测预警系统。较传统的低压配电系统监控而言,能实时监测低压配电系统电缆接头温度,且监测精度较高,对接头温度的异常实时预警,从而显著提升了低压配电系统安全可靠性,降低了人工维护强度,经济技术指标显著。(The invention discloses a low-voltage cable connector temperature on-line monitoring and early warning system, which comprises: a collection unit; the acquisition unit comprises a fluorescent optical fiber temperature sensor which is arranged at the cable connector; a communication unit; the communication unit and the acquisition unit establish TCP/IP connection, and the communication unit and the cloud database establish wireless connection; a mobile application service; and establishing a mobile application service for pushing the collected data at the mobile terminal based on the cloud database. The invention also discloses a low-voltage cable connector temperature online monitoring and early warning method which is applied to the low-voltage cable connector temperature online monitoring and early warning system. Compared with traditional low-voltage distribution system monitoring, the monitoring device can monitor the temperature of a cable joint of the low-voltage distribution system in real time, is high in monitoring precision, and can perform early warning on the abnormity of the temperature of the joint in real time, so that the safety and reliability of the low-voltage distribution system are improved remarkably, the manual maintenance intensity is reduced, and the economic and technical indexes are remarkable.)

1. Low tension cable connector temperature on-line monitoring early warning system, its characterized in that, monitoring early warning system includes:

a collection unit; the acquisition unit comprises a fluorescent optical fiber temperature sensor which is arranged at the cable connector;

a communication unit; the communication unit and the acquisition unit establish TCP/IP connection, and the communication unit and the cloud database establish wireless connection;

a mobile application service; and establishing a mobile application service for pushing the collected data at the mobile terminal based on the cloud database.

2. The on-line temperature monitoring and early warning system for the low-voltage cable connector as recited in claim 1, wherein: the monitoring and early warning system also comprises a monitoring unit;

the acquisition unit is in signal connection with the monitoring unit through an A/D converter, the monitoring unit is provided with an analog quantity monitoring module and a threshold early warning module, the analog quantity monitoring module is electrically connected with the threshold early warning module, and the monitoring unit starts an alarm signal if analog data monitored by the analog quantity monitoring module exceeds a threshold set by the threshold early warning module;

the monitoring unit is in wireless connection with the communication unit, and monitoring data and alarm information of the monitoring unit are stored in the cloud database in real time through the communication unit and are pushed by the mobile terminal.

3. The on-line temperature monitoring and early warning system for the low-voltage cable connector as recited in claim 1, wherein: the acquisition unit is provided with a threshold intercept point and is electrically connected with the power distribution loop switch, and when the temperature acquired by the fluorescent optical fiber temperature sensor reaches the threshold intercept point of the acquisition unit, the acquisition unit triggers the power distribution loop switch to trip.

4. The device of claim 1, whereinCable connector temperature on-line monitoring early warning system presses, its characterized in that: the cross section area of the cable is more than 16 mm²Under the condition of (3), a temperature measuring probe of the fluorescent optical fiber temperature sensor is inserted into the cable connector part, and the temperature measuring probe is close to the copper core of the cable.

5. The on-line temperature monitoring and early warning system for the low-voltage cable connector as recited in claim 1, wherein: the cross section area of the cable is less than or equal to 16 mm²Under the condition, a temperature measuring probe of the fluorescent optical fiber temperature sensor is pasted on the surface of the copper core of the cable connector.

6. The low-voltage cable connector temperature online monitoring and early warning method is applied to the low-voltage cable connector temperature online monitoring and early warning system of any one of claims 1 to 5, and comprises the following steps:

determining the positions and the number of monitoring points of the cable connectors according to the importance level of a power distribution system loop;

determining the installation mode of the fluorescent optical fiber temperature sensor according to the cross section area of the cable, and installing the fluorescent optical fiber temperature sensor;

the method comprises the steps that an acquisition unit, a communication unit and a cloud database are established, and the acquisition unit transmits acquired data to the cloud database for storage and data analysis in real time through the communication unit;

and establishing a mobile application service based on the cloud database, wherein the mobile application service finishes the pushing of the collected data at the mobile terminal.

7. The on-line temperature monitoring and early warning method for the low-voltage cable connector as recited in claim 6, wherein: establishing a monitoring unit, wherein the acquisition unit converts the temperature acquisition quantity into an analog signal monitoring unit, the monitoring unit monitors the analog quantity and sets an early warning threshold, and the monitoring unit starts an alarm signal if the monitored analog data exceeds the early warning threshold;

monitoring data and alarm information of the monitoring unit are stored in a cloud database in real time through the communication unit and are pushed by the mobile terminal.

8. The on-line temperature monitoring and early warning method for the low-voltage cable connector as recited in claim 6, wherein: the acquisition unit is provided with a threshold intercept point, and the acquisition unit triggers the switch of the power distribution loop to trip when the temperature acquired by the fluorescent optical fiber temperature sensor reaches the threshold intercept point of the acquisition unit.

Technical Field

The invention relates to the technical field of cable temperature monitoring, in particular to a temperature on-line monitoring and early warning system and method for a low-voltage cable connector.

Background

The connection of a low-voltage distribution system cable and electrical equipment or a wiring terminal mostly adopts a bolt compression joint mode, the cable joint is inevitably loosened and increased in contact resistance due to expansion with heat and contraction with cold under the alternate operation environment of long-term load heating and no-load cooling, the safety and reliability of loop power supply are seriously influenced due to the occurrence of the condition, the joint part is heated due to the increase of the contact resistance, the connector terminal is slightly burnt due to overheating, and serious accidents such as burning loss of the electrical equipment, electrical fire and the like are seriously caused.

The current adopted modes of the preventive measures for the occurrence of abnormity or accidents caused by the looseness of the low-voltage cable contact mainly comprise the following steps:

firstly, the method comprises the following steps: and (4) infrared temperature measurement, wherein an infrared thermometer is manually adopted for periodic inspection, the working condition of the connector is judged according to the variation trend of the inspection temperature record, and corresponding treatment is carried out.

II, secondly: preventive maintenance, regularly carry out the overhaul of the equipments and maintain, fastening cable joint connecting bolt, avoid the serious not hard up condition of connector to appear in an overhaul of the equipments cycle as far as possible.

Thirdly, the method comprises the following steps: in the monitoring of the environmental temperature in the switch cabinet, temperature sensing elements such as a thermocouple, a thermal resistor, cable type linear temperature sensing and the like are arranged near a large-current cable connector, and key heating parts such as the cable connector and the like are indirectly monitored through monitoring the environmental temperature.

The traditional abnormal monitoring and preventing means for the low-voltage cable connector have certain defects, and faults or accidents caused by the defects cannot be effectively avoided. For a closed switch cabinet, an infrared temperature measurement inspection mode has no condition; regular maintenance can prevent the occurrence of a connector loosening event to a certain extent, but the loosening of the connector is often uncertain due to the change of the operation condition of equipment, environmental factors and the like; the indirect monitoring mode through ambient temperature monitoring lacks the precision, is insensitive to connector temperature variation under the good condition of cabinet body ventilation cooling, and receives ambient temperature to influence great.

Disclosure of Invention

The invention aims to solve the problems and provide an online temperature monitoring and early warning system and method for a low-voltage cable connector.

In order to realize above-mentioned purpose, this disclosure provides a low tension cable connector temperature on-line monitoring early warning system, and monitoring early warning system includes:

a collection unit; the acquisition unit comprises a fluorescent optical fiber temperature sensor which is arranged at the cable connector;

a communication unit; the communication unit and the acquisition unit establish TCP/IP connection, and the communication unit and the cloud database establish wireless connection;

a mobile application service; and establishing a mobile application service for pushing the collected data at the mobile terminal based on the cloud database.

Optionally, the monitoring and early warning system further comprises a monitoring unit;

the acquisition unit is in signal connection with the monitoring unit through an A/D converter, the monitoring unit is provided with an analog quantity monitoring module and a threshold early warning module, the analog quantity monitoring module is electrically connected with the threshold early warning module, and the monitoring unit starts an alarm signal if analog data monitored by the analog quantity monitoring module exceeds a threshold set by the threshold early warning module;

the monitoring unit is in wireless connection with the communication unit, and monitoring data and alarm information of the monitoring unit are stored in the cloud database in real time through the communication unit and are pushed by the mobile terminal.

Optionally, the acquisition unit sets a threshold intercept point, the acquisition unit is electrically connected with the power distribution loop switch, and the acquisition unit triggers the power distribution loop switch to trip when the temperature acquired by the fluorescent optical fiber temperature sensor reaches the threshold intercept point of the acquisition unit.

Optionally, the cross-sectional area of the cable is greater than 16 mm²Under the condition of (3), a temperature measuring probe of the fluorescent optical fiber temperature sensor is inserted into the cable connector part, and the temperature measuring probe is close to the copper core of the cable.

Optionally, the cross-sectional area of the cable is less than or equal to 16 mm²Under the condition, a temperature measuring probe of the fluorescent optical fiber temperature sensor is pasted on the surface of the copper core of the cable connector.

The invention also provides a low-voltage cable connector temperature online monitoring and early warning method, which is applied to the low-voltage cable connector temperature online monitoring and early warning system and comprises the following components:

determining the positions and the number of monitoring points of the cable connectors according to the importance level of a power distribution system loop;

determining the installation mode of the fluorescent optical fiber temperature sensor according to the cross section area of the cable, and installing the fluorescent optical fiber temperature sensor;

the method comprises the steps that an acquisition unit, a communication unit and a cloud database are established, and the acquisition unit transmits acquired data to the cloud database for storage and data analysis in real time through the communication unit;

and establishing a mobile application service based on the cloud database, wherein the mobile application service finishes the pushing of the collected data at the mobile terminal.

Optionally, a monitoring unit is established, the acquisition unit converts the temperature acquisition quantity into an analog signal monitoring unit, the monitoring unit monitors the analog quantity and sets an early warning threshold, and the monitoring unit starts an alarm signal if the monitored analog data exceeds the early warning threshold;

monitoring data and alarm information of the monitoring unit are stored in a cloud database in real time through the communication unit and are pushed by the mobile terminal.

Optionally, the acquisition unit sets a threshold intercept point, and the acquisition unit triggers the switch of the power distribution loop to trip when the temperature acquired by the fluorescent optical fiber temperature sensor reaches the threshold intercept point of the acquisition unit.

The invention has the beneficial effects that:

compared with the traditional low-voltage distribution system monitoring, the on-line monitoring and early warning system and method for the temperature of the low-voltage cable connector can monitor the temperature of the cable connector of the low-voltage distribution system in real time, are high in monitoring precision, and can early warn the abnormity of the temperature of the connector in real time, so that the safety and reliability of the low-voltage distribution system are remarkably improved, the manual maintenance intensity is reduced, and the economic and technical indexes are remarkable.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure without limiting the disclosure. In the drawings:

fig. 1 is a topological diagram of the temperature on-line monitoring and early warning system for the low-voltage cable connector according to the invention.

Detailed Description

The following detailed description of specific embodiments of the present disclosure is provided in connection with the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present disclosure, are given by way of illustration and explanation only, not limitation.

As shown in fig. 1, the temperature on-line monitoring and early warning system for the low-voltage cable connector according to the present invention comprises:

a collection unit; the acquisition unit comprises a fluorescent optical fiber temperature sensor which is arranged at the cable connector;

a communication unit; the communication unit and the acquisition unit establish TCP/IP connection, and the communication unit and the cloud database establish wireless connection;

a mobile application service; and establishing a mobile application service for pushing the collected data at the mobile terminal based on the cloud database.

The fluorescent optical fiber temperature measurement technology has wide application in industrial fields in flammable, explosive and complex electromagnetic environments, is brand new application in the temperature monitoring of low-voltage cable connectors, can obviously improve the power supply reliability of a low-voltage power distribution system, and effectively avoids electrical fire accidents. For a low-voltage power distribution system widely distributed, centralized display and early warning of a mobile terminal are realized through mobile application service.

Optionally, the monitoring and early warning system further comprises a monitoring unit;

the acquisition unit is in signal connection with the monitoring unit through an A/D converter, the monitoring unit is provided with an analog quantity monitoring module and a threshold early warning module, the analog quantity monitoring module is electrically connected with the threshold early warning module, and the monitoring unit starts an alarm signal if analog data monitored by the analog quantity monitoring module exceeds a threshold set by the threshold early warning module;

the monitoring unit is in wireless connection with the communication unit, and monitoring data and alarm information of the monitoring unit are stored in the cloud database in real time through the communication unit and are pushed by the mobile terminal.

Optionally, the acquisition unit sets a threshold intercept point, the acquisition unit is electrically connected with the power distribution loop switch, and the acquisition unit triggers the power distribution loop switch to trip when the temperature acquired by the fluorescent optical fiber temperature sensor reaches the threshold intercept point of the acquisition unit.

Optionally, the cross-sectional area of the cable is greater than 16 mm²Under the condition of (3), a temperature measuring probe of the fluorescent optical fiber temperature sensor is inserted into the cable connector part, and the temperature measuring probe is close to the copper core of the cable and is coated with insulation.

Optionally, the cross-sectional area of the cable is less than or equal to 16 mm²In the case of (3), the temperature probe of the fluorescent optical fiber temperature sensor is usually adhered to the surface of the copper core of the cable connector by using a special adhesive.

The invention also provides a low-voltage cable connector temperature online monitoring and early warning method, which is applied to the low-voltage cable connector temperature online monitoring and early warning system and comprises the following components:

determining the positions and the number of monitoring points of the cable connectors according to the importance level of a power distribution system loop;

determining the installation mode of the fluorescent optical fiber temperature sensor according to the cross section area of the cable, and installing the fluorescent optical fiber temperature sensor;

the method comprises the steps that an acquisition unit, a communication unit and a cloud database are established, and the acquisition unit transmits acquired data to the cloud database for storage and data analysis in real time through the communication unit;

and establishing a mobile application service based on the cloud database, wherein the mobile application service finishes the pushing of the collected data at the mobile terminal.

Optionally, a monitoring unit is established, the acquisition unit converts the temperature acquisition quantity into an analog signal monitoring unit, the monitoring unit monitors the analog quantity and sets an early warning threshold, and the monitoring unit starts an alarm signal if the monitored analog data exceeds the early warning threshold;

monitoring data and alarm information of the monitoring unit are stored in a cloud database in real time through the communication unit and are pushed by the mobile terminal.

Optionally, the acquisition unit sets a threshold intercept point, and the acquisition unit triggers the switch of the power distribution loop to trip when the temperature acquired by the fluorescent optical fiber temperature sensor reaches the threshold intercept point of the acquisition unit.

The invention relates to a low-voltage cable connector temperature online monitoring and early warning system and a method thereof, wherein the adopted fluorescence optical fiber temperature measurement technology adopts optical signal transmission, has the advantages of high safety, wide applicable environment, strong anti-electromagnetic interference capability and the like, and is widely applied to industrial fields. The fluorescent optical fiber temperature measuring element is configured at the cable connector of the important low-voltage distribution system loop, the element can be pasted on the connector or embedded in a cable core wire according to the condition of a field cable, an acquired signal is transmitted to the acquisition unit through optical fiber, the acquisition unit is configured with 4-20mA analog quantity output, switching value threshold value quotation contact output, a Modbus TCP communication interface and a WIFI interface, and data communication between the acquisition unit and a cloud data server and a monitoring system is realized. For power supply and distribution enterprises with monitoring systems, temperature thresholds for alarming and tripping can be set in the monitoring systems, so that online real-time monitoring and control of low-voltage cable joints are realized; for users who do not deploy a computer monitoring system, the mobile application service can be utilized to realize the online monitoring and automatic early warning information pushing of a mobile terminal. Therefore, the online real-time monitoring of the running state of the cable joint of the low-voltage distribution system is realized, and the reliability and the safety of power supply of the low-voltage distribution system are obviously improved.

Compared with traditional low-voltage distribution system monitoring, the monitoring device can monitor the temperature of a cable joint of the low-voltage distribution system in real time, is high in monitoring precision, and can perform early warning on the abnormity of the temperature of the joint in real time, so that the safety and reliability of the low-voltage distribution system are improved remarkably, the manual maintenance intensity is reduced, and the economic and technical indexes are remarkable.

The preferred embodiments of the present disclosure are described in detail with reference to the accompanying drawings, however, the present disclosure is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present disclosure within the technical idea of the present disclosure, and these simple modifications all belong to the protection scope of the present disclosure.

It should be noted that, in the foregoing embodiments, various features described in the above embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, various combinations that are possible in the present disclosure are not described again.

In addition, any combination of various embodiments of the present disclosure may be made, and the same should be considered as the disclosure of the present disclosure, as long as it does not depart from the spirit of the present disclosure.