CN203688080U - Substation high-voltage switch cabinet temperature online monitoring device - Google Patents

Abstract

The utility model relates to an on-line temperature monitoring device of a high-voltage switch cabinet in a substation, which relates to the technical field of state maintenance of high-voltage electrical equipment in a power station. Including high-voltage switchgear, monitoring unit, receiving unit, wireless repeater, monitoring host and display. The monitoring unit is composed of a temperature-sensing probe, an induction power-taking box, and a wireless transmitting unit. The receiving unit includes a receiving antenna, GFSK modulation, and PCL; the temperature-sensing probe is connected to the wireless transmitting unit, the wireless transmitting unit is connected to the induction power-taking box, and the wireless relay The device and the monitoring unit are connected by wireless communication; the receiving antenna of the receiving unit and the monitoring host are connected by RS485 communication; The current passing through the copper bar of the cabinet generates induction to obtain electric energy, and supplies power to the wireless transmitting unit. It solves the problem that the real-time online monitoring temperature data in the high-voltage cabinet is difficult to obtain and the accuracy is not high.

Description

Substation high voltage switchgear temperature online monitoring device

technical field

The utility model relates to the technical field of state maintenance of high-voltage electrical equipment in a power station, in particular to an online monitoring device for the temperature of a high-voltage switch cabinet in a substation.

Background technique

During the long-term operation of high-voltage switch cabinets and capacitor cabinets in substations, the contacts of switches and busbar connections will become hot due to aging or excessive contact resistance, and the temperature of these heating parts cannot be monitored, which eventually leads to accidents. In recent years, many switch overheating accidents have occurred in power plants and substations, resulting in large-scale power outages. The heating point is in the sealed cabinet, and the door of the cabinet during operation is forbidden to be opened, and the personnel on duty cannot find the heating defect through normal monitoring methods. The temperature rise of the switchgear exceeds the standard, which directly affects the safe and stable operation of the equipment. Moreover, the problem of overheating is a continuous development process. If it is not controlled, the degree of overheating will continue to increase, and it will have a great impact on the performance of the insulating parts and the life of the equipment. Influence.

At present, there are many technical means to solve the problem of switch overheating. However, the use of temperature online monitoring is an important means to ensure the safe operation of high-voltage switchgear, especially in the high-voltage switchgear. Contact online real-time temperature monitoring has certain difficulties.

Utility model content

The purpose of this utility model is to provide an on-line monitoring device for the temperature of a high-voltage switchgear in a substation, in order to accurately locate and alarm the fault point, and to perform contact-type online real-time temperature monitoring inside the high-voltage switchgear.

The technical solution to realize the purpose of this utility model is as follows: an on-line monitoring device for the temperature of a high-voltage switchgear in a substation, including a high-voltage switchgear, a monitoring unit, a receiving unit, a wireless repeater, a monitoring host and a display; Probe, induction power-taking box, wireless transmitting unit, the receiving unit includes receiving antenna, GFSK modulation, PCL; the temperature-sensing probe is connected with the wireless transmitting unit, the wireless transmitting unit is connected with the induction power-taking box, wireless repeater It is connected with the monitoring unit by wireless communication; between the receiving antenna of the receiving unit and the monitoring host, it is connected by RS485 communication; the monitoring unit is flatly fixed on the surface of the connecting copper bar of the static contact in the high-voltage switch cabinet , its induction power-taking box generates induction to the current passing through the copper bar of the switch cabinet to obtain electric energy, and supplies power to the wireless transmitting unit.

Further, each monitoring unit is equipped with an induction power-taking box.

Further, the temperature-sensing probe is connected to the wireless transmitting unit through a nitrile wire capable of high temperature and high pressure, and installed at an equipotential.

Furthermore, intelligent analysis software is pre-installed on the host computer and the monitoring host computer of the monitor installed in the main control room.

Furthermore, the receiving unit is also provided with a programmable logic controller PLC and communicates with the host computer in the main control room.

Compared with the existing technology, the utility model solves the problem that the real-time online monitoring temperature data in the high-voltage cabinet is difficult to obtain and the accuracy is not high; In the future, whether it is to increase the number of monitoring temperature points or expand the system function, it will be easy to realize. The data of this device is accurate, the external influence is small, the power supply is continuous and stable, and Siemens industrial-grade PLC is adopted, the system performance is stable, reliable, and the anti-interference is extremely strong. Slit connection, no loss of signal attenuation.

Description of drawings

Fig. 1 is a schematic diagram of a structural block diagram of the device described in the present invention.

Fig. 2 is a schematic diagram of the structure of the monitoring unit.

Fig. 3 is an embodiment of the utility model device.

Detailed ways

Below in conjunction with accompanying drawing and embodiment, the utility model is described in further detail. It should be emphasized that the specific embodiments described here are only used to explain the utility model, and are not used to limit the scope of the concept of the utility model and the claims thereof.

Referring to Fig. 1, Fig. 2, shown in Fig. 3, the device of the present invention is an online monitoring device, including a high-voltage switch cabinet, a monitoring unit 1, a receiving unit 2, a wireless repeater 3, a monitoring host and a display 4. The monitoring unit 1 is composed of a temperature-sensing probe, an induction power-taking box, and a wireless transmitting unit; the number of monitoring units 1 can be expanded arbitrarily; different installations can be used to monitor busbars, disconnectors, transformers, etc., so each monitoring unit is equipped with a Induction pick-up box.

The temperature probe adopts DXJ-CD model specification, adopts industrial-grade intelligent digital temperature sensing IC, point-to-point accurate detection, and high-precision temperature measurement IC converts temperature into electrical signal. The temperature-sensing probe and the wireless transmitting unit are connected by high-temperature and high-voltage nitrile wires, and are installed at the same potential.

The wireless transmitting unit adopts DXJ/GN/JH model specification, and adopts GSFK demodulation method to send the temperature signal. The induction power-taking box is connected with the wireless transmitting unit, and the DXJ-POWER model is selected, and the power is taken from the bus through the coil induction method, and the power is supplied after the voltage is stabilized through the circuit.

The wireless repeater 3 and the monitoring unit 1 are connected by wireless communication; the wireless repeater 3 adopts the DXJ/ZJ model, and the temperature signal is received on site, compensated and amplified, and then sent to a distant place. The receiving unit 2 includes a receiving unit Antenna, GFSK modulation, programmable logic controller PCL; the programmable logic controller PLC communicates with the host in the main control room; the receiving antenna of the receiving unit 2 and the host are connected by RS485 communication lines; the receiving unit 2 body is selected DXJ/GN/JS models receive temperature digital signals through an external receiving antenna for processing, analysis, storage or alarm, and can be operated and set. The monitoring unit is flatly fixed on the surface of the connecting copper bar of the static contact in the high-voltage switch cabinet, and its induction power-taking box takes power from the busbar through coil induction, and supplies power after voltage stabilization through the circuit.

The monitoring host installed in the main control room is pre-installed with intelligent analysis software. The monitoring host and analysis software do data processing and calculation through Siemens PLC, and the pre-installed intelligent analysis software realizes the setting, saving, analysis, sorting, output, and alarm of high-voltage electrical equipment maintenance data.

The working principle of the utility model device is as follows: the monitoring unit is installed inside the 10kV high-voltage switchgear to measure the parts that are prone to heat, such as the dynamic and static contacts and joints of the isolating switch in the high-voltage switchgear, and at the same time, the induction power-taking box is taken from the The power is obtained from the busbar of the switchgear and the voltage is stabilized to supply power to the monitoring unit to ensure continuous and uninterrupted work of the monitoring unit, and the measured temperature data is sent to the wireless repeater outside the high-voltage switchgear, through the compensation of the repeater Finally, the temperature data is sent wirelessly to the receiving unit in the main control room for display, analysis, storage, processing, etc.

Claims (3)

1. An online temperature monitoring device for a high-voltage switchgear in a substation, including a high-voltage switchgear, a monitoring unit (1), a receiving unit (2), a wireless repeater (3); a monitoring host and a display (4); the monitoring unit (1) Consists of a temperature-sensing probe, an induction power-taking box, and a wireless transmitting unit, and the receiving unit (2) includes a receiving antenna, GFSK modulation, and a programmable logic controller PCL; the temperature-sensing probe is connected to the wireless transmitting unit, The wireless transmitting unit is connected to the induction power-taking box, and the wireless repeater (3) and the monitoring unit (1) are connected by wireless communication; the receiving antenna of the receiving unit (2) is connected to the monitoring host (4) , using RS485 communication connection; it is characterized in that the monitoring unit (1) is flatly fixed on the surface of the connecting copper bar of the static contact in the high-voltage switch cabinet, and its induction power-taking box generates current passing through the copper bar of the switch cabinet The electric energy is obtained by induction to supply power to the wireless transmitting unit. 2. The on-line temperature monitoring device for high-voltage switchgear in a substation according to claim 1, wherein each monitoring unit (1) is equipped with an induction power-taking box. 3. The on-line temperature monitoring device for high-voltage switchgear in a substation according to claim 1, characterized in that the temperature-sensing probe and the wireless transmitting unit are connected by a high-temperature, high-voltage nitrile wire and installed at an equipotential.

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