CN104390711A - Contact thermometer of high-voltage switch cabinet - Google Patents

Abstract

The invention relates to electrical equipment, in particular to a high-voltage switch cabinet contact thermometer, which includes a host computer, a receiving host and a transmitting module. The transmitting module connects to the receiving host through a wireless connection, and the receiving host connects to the upper computer through serial communication. The present invention monitors the heating temperature of the switch contact in time, and gives a real-time alarm to the abnormal heating contact to prevent the contact from being burned out. At the same time, the historical record of the contact temperature and the analysis of the historical temperature data can effectively guarantee the normal operation of the switch cabinet . There is no need to manually go to the site for temperature measurement, and it has reliable high-voltage isolation and anti-interference capabilities, which is of great significance to the safe operation of the switchgear.

Description

High-voltage switchgear contact thermometer

technical field

The invention relates to electrical equipment, in particular to a high-voltage switch cabinet contact thermometer.

Background technique

High-voltage switchgear is an important electrical equipment in power plants and substations. During the long-term operation of the high-voltage switchgear, due to the aging of the contacts in the switchgear or the connection of the bus bar, the contact resistance increases and heats up, resulting in the temperature of the contact or the connection of the bus bar rising. The temperature rise of the contact or bus bar connection will further increase the contact resistance, thereby generating more heat and further increasing the contact resistance, forming a vicious circle, which will eventually lead to fire accidents and failures. In recent years, many switchgear overheating accidents have occurred in power plants and substations, causing fires and large-scale power outages. Predicting the operating status of the switchgear and confirming that the temperature rise of the switchgear is within the allowable range is the key to preventing such accidents. The key to happening.

However, it is difficult to detect the operating temperature of the contacts in the high-voltage switch cabinet. This is mainly because there is high voltage in the cabinet, the space is narrow and mostly closed, and the usual temperature measurement method cannot be used. At present, there are two types of instruments for measuring the temperature of high-voltage switches. One uses an analog temperature sensor, which has inaccurate temperature accuracy and poor anti-interference ability; Use is restricted.

Contents of the invention

One of the objectives of the present invention is to provide a high-voltage switch cabinet contact thermometer suitable for use in a high-voltage cabinet. The thermometer does not need to go to the site for temperature measurement manually, and has reliable high-voltage isolation and anti-interference capabilities. The safe operation of switchgear is of great significance.

The invention provides a contact thermometer suitable for high-voltage switch cabinets, which includes a host computer, a receiving host and a transmitting module. The transmitting module is connected to the receiving host through wireless transmission, and the receiving host is connected to the upper computer through serial communication.

The receiving host includes No. 1 power supply module, display module, alarm module, No. 1 MCU, wireless data receiving module and serial communication module. No. 1 MCU is respectively connected to No. 1 power module, display module, alarm module, wireless data receiving module and serial communication module. module.

The wireless data receiving module receives the data from the transmitting module and transmits it to the No. 1 MCU. The No. 1 MCU processes the data and transmits it to the display module to display the temperature. At the same time, it sends all the temperature data to the host computer through the serial port communication module. When abnormal temperature data occurs At the same time, the No. 1 MCU transmits the alarm information to the alarm module for alarming, and the No. 1 power supply module supplies power to the receiving host.

The transmitting module includes No. 2 power supply module, temperature measuring module, No. 2 MCU and wireless data transmitting module. The No. 2 MCU is respectively connected to the No. 2 power supply module, the temperature measurement module and the wireless data transmission module.

After the temperature measurement module measures the temperature of the contact, it sends data to the No. 2 MCU. After the No. 2 MCU processes the data, it is sent to the receiving host by the wireless data sending module. The No. 2 power supply module supplies power to the temperature measurement module, the No. 2 MCU and the wireless data transmission module.

The No. 2 power supply module obtains AC current through the electromagnetic induction of the CT coil and the high-voltage busbar, and supplies power to the temperature measurement module, the No. 2 MCU and the wireless transmission module after rectification and filtering.

Electromagnetic induction occurs between the CT coil and the high-voltage busbar to obtain AC current. The AC current is rectified by a rectifier diode to become a DC current. The DC current is filtered by the zero capacitor. The filtered DC current is divided into two channels, and one channel passes through the No. The circuit and the No. 1 capacitor get a 5V DC current; the other channel gets a 3.3V DC current through the No. 2 voltage stabilizing circuit and the No. 2 capacitor. The two DC currents simultaneously supply power to the temperature measuring module, the No. 2 MCU and the wireless data transmitting module.

The transmitting module includes one or more.

The beneficial effect of the present invention is that: the present invention can monitor the heating temperature of the switch contact in time, alarm the abnormal heating contact in real time, and prevent the contact from being burned out. Record the historical temperature of the contacts, analyze the historical temperature data, and effectively ensure the normal operation of the switchgear. It has reliable high voltage isolation and anti-interference ability.

Description of drawings

Fig. 1 is a block diagram of the overall structure;

Fig. 2 is a schematic block diagram of the structure of the receiving host;

Figure 3 is a circuit diagram of the No. 1 power supply module;

Fig. 4 is a structural block diagram of the transmitting module;

Fig. 5 is the circuit diagram of No. 2 power supply module;

In the figure, host computer 1, receiving host 2, transmitting module 3, No. 1 power supply module 4, display module 5, alarm module 6, No. 1 MCU 7, wireless data receiving module 8, serial communication module 9, No. 2 power supply module 10, A temperature measurement module 11 , a No. 2 MCU 12 , and a wireless data transmission module 13 .

specific embodiment

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that the technical features or combinations of technical features described in the following embodiments should not be regarded as isolated, and they can be combined and combined with each other to achieve better technical effects. In the drawings of the following embodiments, the same reference numerals appearing in each drawing represent the same features or components, which can be applied in different embodiments.

As shown in FIG. 1 , it is a schematic block diagram of the overall structure of the present invention. The present invention is a high-voltage switch cabinet contact thermometer, including a host computer 1 , a receiving host 2 and a transmitting module 3 . One or more transmitting modules 3 are connected to the receiving host 2 through wireless connection, and the receiving host 2 is connected to the host computer 1 through serial port communication.

As shown in FIG. 2 , the receiving host 2 is a structural block diagram. The receiving host 2 includes a No. 1 power module 4 , a display module 5 , an alarm module 6 , a No. 1 MCU 7 , a wireless data receiving module 8 and a serial communication module 9 . No. 1 MCU 7 is respectively connected to No. 1 power supply module 4 , display module 5 , alarm module 6 , wireless data receiving module 8 and serial port communication module 9 .

FIG. 3 is a circuit diagram of the No. 1 power supply module 4 , and the No. 1 power supply module 4 mainly supplies power to the receiving host 2 . No. 1 power supply module 4 obtains 5V AC power from 220V AC through a step-down transformer, rectifies and filters, and passes through voltage stabilizing circuits VR1 and VR2 to obtain 5V and 3.3V DC power respectively, and the rectified power JD supplies power to the relay coil of alarm module 6 . Parts D21-D24 rectify the alternating current into direct current, and the capacitors of C41-C44 filter the rectified power supply.

As shown in Figure 4, it is a structural block diagram of the transmitting module 3. The transmitting module 3 includes a No. 2 power supply module 10, a temperature measurement module 11, a No. 2 MCU 12 and a wireless data transmitting module 13. The No. 2 MCU 12 is respectively connected to the No. 2 power module 10 , the temperature measurement module 11 and the wireless data transmitting module 13 .

Figure 5 shows the circuit diagram of the No. 2 power module 10. The No. 2 power module 10 generates an AC current through the electromagnetic induction between the CT coil and the high-voltage busbar in the switch cabinet. The current is then filtered by the capacitors C41~C44, and the filtered DC current is divided into two paths, one path passes through the voltage regulator circuit VR1 and capacitors C21, C22 to obtain a 5V DC current; the other path passes through the voltage regulator circuit VR2 and capacitors C23, C24 A DC current of 3.3V is obtained. The two DC currents supply power to the temperature measuring module 11 , the No. 2 MCU 12 and the wireless data transmitting module 13 at the same time.

The transmitting module 3 is installed in the position where the high-voltage switchgear needs to measure the temperature. The temperature measurement module 11 in the transmitting module 3 performs temperature measurement, and uploads the temperature measurement data to the receiving host 2 through the wireless data transmitting module 13 and the wireless data receiving module 8 , The receiving host 2 and the upper computer 1 adopt serial port communication, and transmit the inquired data to the upper computer 1, so that the inspector can inquire whether the data is abnormal. The main system of the upper computer 1 adopts labview and configuration software, which has good compatibility with industrial field monitoring equipment.

The present invention monitors the heating temperature of the switch contact in time, and gives a real-time alarm to the abnormal heating contact to prevent the contact from being burned out. At the same time, the historical record of the contact temperature and the analysis of the historical temperature data can effectively guarantee the normal operation of the switch cabinet . There is no need to manually go to the site for temperature measurement, and it has reliable high-voltage isolation and anti-interference capabilities, which is of great significance to the safe operation of the switchgear.

Although some embodiments of the present invention have been given herein, those skilled in the art should understand that the embodiments herein can be changed without departing from the spirit of the present invention. The above-mentioned embodiments are only exemplary, and the embodiments herein should not be used as limitations on the scope of rights of the present invention.

Claims (7)

1. a high-tension switch cabinet contact temperature measurer, is characterized in that: comprise host computer, Receiving Host and transmitter module, and described host computer connects described Receiving Host by serial communication, and described Receiving Host connects described transmitter module by wireless transmission.

2. high-tension switch cabinet contact as claimed in claim 1 temperature measurer, it is characterized in that: described Receiving Host comprises a power module, display module, alarm module, MCU, wireless data receipt modules and a serial communication module, a described MCU connects a described power module, described display module, described alarm module, described wireless data receipt modules and described serial communication modular respectively.

3. high-tension switch cabinet contact as claimed in claim 2 temperature measurer, it is characterized in that: described wireless data receipt modules receives the data from described transmitter module and is transferred to a described MCU, a described MCU will be transferred to described display module displays temperature after data processing, by described serial communication module, all temperature datas are sent to described host computer simultaneously, a MCU described in when occurring abnormal temperature data transmits warning message and reports to the police to described alarm module, and a described power module powers to described Receiving Host.

4. the high-tension switch cabinet contact temperature measurer as described in any one of claim 1-3, it is characterized in that: described transmitter module comprises No. two power modules, temperature measurement module, No. two MCU and wireless data transmission module, described No. two MCU are connected with described wireless data transmission module with described No. two power modules, described temperature measurement module respectively.

5. high-tension switch cabinet contact as claimed in claim 4 temperature measurer, it is characterized in that: described No. two power modules obtain alternating current by CT coil and high-voltage busbar generation electromagnetic induction, after rectifying and wave-filtering, give temperature measurement module, No. two MCU and wireless data transmission module for power supply.

6. high-tension switch cabinet contact as claimed in claim 5 temperature measurer, it is characterized in that: described temperature measurement module sends data to described No. two MCU after recording contact temperature, send to described Receiving Host by described wireless data sending module after described No. two MCU process data, described No. two power modules power to described transmitter module.

7. the high-tension switch cabinet contact temperature measurer as described in any one of claim 1,2,3,5 or 6, is characterized in that: described transmitter module is one or more.