CN202631151U - Powerless and wireless online monitoring system for temperature of switch cabinet - Google Patents

Abstract

The utility model belongs to a wireless temperature measuring device, in particular to a passive wireless switch cabinet temperature on-line monitoring system with simple structure, convenient and practical, safe and reliable, good environmental adaptability and low cost; it includes a switch cabinet, a temperature collector, a main controller Indoor display terminal and remote monitoring data acquisition and monitoring control system, the switch cabinet is equipped with a surface acoustic wave temperature sensor, the surface acoustic wave temperature sensor is provided with a first wireless receiving module, the temperature collector A second wireless receiving module with an antenna and a first wireless transmitting module with an antenna are provided. The display terminal in the main control room and the data acquisition and monitoring control system for remote monitoring are respectively connected to the temperature measurement main control terminal through communication cables. The temperature measurement main control terminal is connected to the temperature collector through the third wireless receiving module with antenna or communication cable; it has the advantages of simple structure, convenient and practical, safe and reliable, good environmental adaptability and low cost.

Description

Passive wireless switchgear temperature online monitoring system

technical field

The utility model belongs to a wireless temperature measuring device, in particular to a passive wireless switch cabinet temperature on-line monitoring system with simple structure, convenient and practical, safe and reliable, good environmental adaptability and low cost.

technical background

For important equipment such as high-voltage switchgear, busbar joints, and outdoor knife switches in power plants and substations, during long-term operation, the contacts of switches and busbar connections will heat up due to aging or excessive contact resistance. The temperature cannot be monitored, which eventually leads to the accident. In recent years, many switch overheating accidents have occurred in power plants and substations, resulting in fires and large-scale blackouts. Solving the problem of switch overheating is the key to eliminating such accidents. Realizing online temperature monitoring is an important means to ensure the safe operation of high-voltage equipment . Because of the power plant, the high-voltage cabinets, busbar joints, and outdoor switch blades of the substation are at high potential. At present, there are few devices specially used for heating and temperature measurement of high-voltage power equipment in China. There are mainly the following methods for temperature detection of power system equipment:

One is that the optical fiber temperature measurement method belongs to the wired temperature measurement method. Due to the influence of the equipment structure, the wiring is more difficult. The optical fiber is easy to break, easy to break, not resistant to high temperature and easy to be affected by environmental factors such as dust accumulation. It belongs to the wired measurement method. When there is an obstacle, the connection of the optical fiber cannot be carried out, so the temperature cannot be measured. After the accumulation of dust, it is easy to cause the optical fiber to discharge along the surface and reduce the insulation. The battery sensor is relatively large in size and difficult to install in a small space. It needs to replace the battery regularly, which brings a huge maintenance workload. The long-term operation of the battery in an environment with high temperature and strong electromagnetic field has certain potential safety hazards. The second is infrared temperature measurement. The probe must keep a certain distance from the measured object and face the surface of the measured object. It is required that the measured point is unobstructed in the field of view. Therefore, it is difficult to find a suitable installation position in the limited space in the equipment; usually it is necessary to drill holes on the equipment and install other components to install the infrared probe, which will destroy the structure of the equipment itself. Easily affected by environmental factors, such as ambient temperature, humidity, dust in the air, etc. Due to the influence of the emissivity of the measured object, it is almost impossible to measure the real temperature of the measured object. The surface temperature is measured, and the temperature measurement error of the bright or polished metal surface is relatively large.

Contents of the invention

The purpose of the utility model is to overcome the deficiencies in the prior art and provide a passive wireless switchgear temperature on-line monitoring system with simple structure, convenient and practical, safe and reliable, good environmental adaptability and low cost.

The purpose of this utility model is achieved in this way: including a switch cabinet, a temperature collector, a display terminal in the main control room and a remote monitoring data acquisition and monitoring control system, the surface of the object to be measured on the switch cabinet is equipped with a surface acoustic wave temperature sensor, the surface acoustic wave temperature sensor is provided with a first wireless receiving module, the temperature collector is provided with a second wireless receiving module with an antenna and a first wireless transmitting module with an antenna, the main control The indoor display terminal and the remote monitoring data collection and monitoring control system are respectively connected to the temperature measurement main control terminal through a communication cable, and the temperature measurement main control terminal is connected to the temperature measurement through a third wireless receiving module with an antenna or a communication cable. The collector is connected. The communication cable mentioned is an rs485 cable. There is at least one surface acoustic wave temperature sensor. There is at least one temperature collector.

The utility model has the advantages of simple structure, convenience and practicality, safety and reliability, good environmental adaptability and low cost.

Description of drawings

Fig. 1 is a block diagram of the control principle of the utility model.

Detailed ways

As shown in Figure 1, the utility model includes a switch cabinet, a temperature collector 1, a display terminal 6 in the main control room and a data acquisition and monitoring control system 7 for remote monitoring, and an acoustic surface is installed on the surface of the object to be measured on the switch cabinet. Wave temperature sensor 2, described surface acoustic wave temperature sensor 2 is provided with first wireless receiving module 4, and described temperature collector 1 is provided with the second wireless receiving module 9 with antenna and the first wireless transmitting module 9 with antenna Module 8, the display terminal 6 in the main control room and the data acquisition and monitoring control system 7 for remote monitoring are respectively connected to the temperature measurement main control terminal 5 through communication cables, and the temperature measurement main control terminal 5 is connected to the temperature measurement main control terminal 5 through a belt antenna The third wireless receiving module 3 or the communication cable is connected with the temperature collector 1 . The communication cable mentioned is an rs485 cable. There is at least one surface acoustic wave temperature sensor 2 . There is at least one temperature collector 1 .

The surface acoustic wave temperature sensor 2 in the utility model applies the physical properties of the crystal material, and the change of the physical properties of the crystal is automatically converted into an electrical signal through the principle of piezoelectric induction. The working principle of the surface acoustic wave temperature sensor 2 is to transmit a radio frequency signal to the surface of the piezoelectric material, and then convert the reflected wave affected by the temperature back to an electrical signal to obtain temperature data. The biggest advantage of surface wave technology is to use the passive working principle of the sensor, that is, to realize wireless temperature data acquisition in an unconventional operating environment.

The working principle of the utility model is that the temperature collector 1 emits radio frequency pulses through the first wireless transmitting module 8 with an antenna. After the radio frequency pulse signal is received by the first wireless receiving module 4 on the surface acoustic wave temperature sensor 2, the surface acoustic wave temperature sensor 2 activates the surface wave, and the frequency of the surface wave occurs due to the influence of the temperature of the surface acoustic wave temperature sensor 2 itself. Change, due to the mechanism of the frequency being changed by the temperature, the temperature data measurement can be realized. The frequency oscillation of the surface wave is converted into a sound wave communication signal, which is processed after being received by the second wireless receiving module 9 on the temperature collector 1, and then the signal is transmitted by the first wireless transmitting module 8 with antenna, so that The third wireless receiving module 3 with an antenna receives it; after receiving the signal, the temperature measurement main control terminal 5 processes the data and displays it on the display terminal 6 in the main control room and the data acquisition and monitoring control system 7 for remote monitoring. The temperature collector 1 can be connected with the temperature measurement main control terminal 5 through a communication cable.

Claims (4)

1. passive and wireless switch cubicle temperature online monitoring system; Comprise display terminal (6) and the data acquisition and the supervisor control (7) of remote monitoring in the switch cubicle, Temperature sampler (1), master-control room; It is characterized in that: the object under test mounted on surface on the described switch cubicle has surface acoustic wave temperature sensor (2); Described surface acoustic wave temperature sensor (2) is provided with first wireless receiving module (4); Described Temperature sampler (1) is provided with second wireless receiving module (9) of band antenna and first wireless transmitter module (8) of band antenna; The display terminal (6) in the described master-control room and the data acquisition of remote monitoring link to each other with thermometric main control terminal (5) through communication cable respectively with supervisor control (7), and described thermometric main control terminal (5) links to each other with Temperature sampler (1) through the 3rd wireless receiving module (3) or the communication cable of band antenna.

2. passive and wireless switch cubicle temperature online monitoring system according to claim 1 is characterized in that: described communication cable is the rs485 cable.

3. passive and wireless switch cubicle temperature online monitoring system according to claim 1 is characterized in that: described surface acoustic wave temperature sensor (2) is at least one.

4. passive and wireless switch cubicle temperature online monitoring system according to claim 1 is characterized in that: described Temperature sampler (1) is at least one.

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