CN103557957A - Device for online monitoring temperature of contact of substation equipment - Google Patents

Abstract

The on-line monitoring device for substation equipment contact temperature of the present invention belongs to the technical field of substation equipment temperature monitoring devices; the technical problem to be solved is: to provide a device for convenient substation equipment contact temperature monitoring; The cross-regional monitoring master station computer of the monitoring master station, the monitoring center computer installed in the substation monitoring center, the bus gateway installed in the power distribution room, the temperature collector installed on the switch cabinet and the passive wireless temperature controller installed on the surface of the measured element sensor, the computer of the cross-regional monitoring master station is connected to a plurality of monitoring center computers, the monitoring center computer is connected to a plurality of bus gateways, the bus gateway is connected to a plurality of temperature collectors through a communication bus, and the temperature collectors It is connected with a plurality of passive wireless temperature sensors through a wireless radio frequency network; the invention is suitable for power supply departments.

Description

Substation equipment contact temperature online monitoring device

technical field

The invention relates to an online monitoring device for contact temperature of substation equipment, belonging to the technical field of temperature monitoring devices for substation equipment.

Background technique

Power grid safety production is not only a huge and complex system engineering, but also the basis for the reform, development and stability of power companies and the whole society. It is the top priority for the development of smart grids in my country and the world in the future. In a series of important documents such as the "National Medium and Long-Term Science and Technology Development Plan" and the "State Grid Corporation Green Development White Paper" issued by the State Grid on April 19, the security of the smart grid has been included in the national major priority development and implementation. theme.

During the long-term operation of each equipment in the substation, the contacts of the switch and the bus connection and other parts will heat up due to aging or excessive contact resistance, and the temperature of these heating parts cannot be monitored, which will eventually lead to accidents. The power equipment is safe and reliable Safety is an important part of ultra-large-scale power transmission and distribution and grid security. While continuously expanding power supply, it brings a series of safety problems to grid electrical equipment. In order to avoid various power accidents as much as possible, the task of real-time monitoring of power equipment safety operation imminent.

The contacts and joints in the power grid equipment are an important hidden danger of the power grid security. The existing statistical results show that the fault mainly occurs in the following positions: 1. The fault of the dynamic and static contacts in the switch cabinet. As a widely used Power equipment, switchgear is an important equipment in the power transmission and distribution system, which plays an important role in breaking and closing power lines, line fault protection, and monitoring operating power data; , coupled with long-term high current, contact aging and other factors will easily cause the contact resistance to increase, resulting in long-term heating, excessive temperature rise of the contacts, and even the eventual high-voltage cabinet burning failure; 2. Cable joint failure, with the operation The prolongation of time, the loosening of crimping joints, the aging of insulation, partial discharge, high voltage leakage, etc. will cause heating and temperature rise, and the rise of temperature will further deteriorate these conditions, which will promote the further increase of temperature. As a result of the cycle, short-circuit blasts and even fires are triggered.

In order to solve this problem, there are usually several ways from the principle of temperature measurement, from the perspective of transmission, including wired and wireless data transmission.

1. Conventional temperature measurement methods: The disadvantages of conventional thermocouples, thermal resistances, semiconductor temperature sensors and other temperature measurement methods are that they cannot be wireless and passive, and metal wires are required to transmit signals. They cannot work independently wirelessly, and insulation performance cannot be guaranteed. Even if wireless transmission is used The module, in the complex situation of the magnetic field, electric field and thermal field of the power grid, has weak anti-interference ability and cannot work normally.

2. Optical fiber temperature measurement: The optical fiber temperature sensor uses optical fiber to transmit temperature signals. The optical fiber has excellent insulation performance and can isolate the high voltage in the switch cabinet. Therefore, the optical fiber temperature sensor can be directly installed on the high voltage contact in the switch cabinet, accurate Measure the operating temperature of the high-voltage contacts to realize online monitoring of the operating temperature of the switch cabinet contacts. However, the optical fiber is easy to break, easy to break, and not resistant to high temperatures. After accumulating dust, it is easy to cause the optical fiber to discharge along the surface and reduce the insulation. The optical fiber It belongs to the wired method, which will destroy the existing equipment structure. Due to the influence of the structure of the switch cabinet, it is difficult to wire in the cabinet. In addition, the cost of optical fiber temperature measurement is relatively high.

3. Infrared temperature measurement: Infrared temperature measurement is non-contact temperature measurement, which is widely used in temperature monitoring of substation bushings, arresters, busbars and other equipment. However, due to the complex internal structure of high-voltage switchgear, the components are more shielded from each other. Through The accuracy of the temperature data obtained indirectly by the infrared spectrum cannot meet the requirements, and the computer recognition technology level of the infrared spectrum cannot replace manual identification, and the degree of automation is not high. The temperature is easily disturbed by the environment and the surrounding electromagnetic field. Because the space in the switch cabinet is very narrow, it is impossible to install an infrared temperature measurement probe (because the probe must keep a certain safe distance from the measured object and need to face the surface of the measured object), It is required that the point to be measured can be unobstructed in the field of view, and the surface is clean to ensure accuracy. Therefore, when using the infrared imager to measure the temperature, there will be dead angles, which cannot be fully monitored; the infrared imager must be measured by the staff. It is impossible to realize remote and real-time monitoring, which wastes a lot of manpower; when monitoring outdoor knife gates, etc., due to the long distance and high cost, the equipment will fail to monitor in ice and snow weather.

4. Active wireless temperature measurement: Active wireless temperature sensors are usually relatively large in size and need to be replaced frequently. The maintenance cost of the system is high. At the same time, the battery is not suitable for working in a high temperature state. If the temperature is too high, it will affect the normal operation of the battery. , will eventually affect the measurement accuracy, and even false alarms will occur; in addition, when the battery power is insufficient, false alarms will occur, which will affect the monitoring accuracy; in addition, most of the antennas used by wireless sensors are ordinary sucker antennas. Due to its shape, it cannot be installed in the handcart cabinet when it is used for contact temperature monitoring in the switch cabinet.

Contents of the invention

The invention overcomes the deficiencies in the prior art, and the technical problem to be solved is: to provide a system for monitoring the contact temperature of substation equipment conveniently.

In order to solve the above-mentioned technical problems, the technical solution adopted in the present invention is: the on-line monitoring device for substation equipment contact temperature, including the cross-region monitoring master station computer installed in the cross-region monitoring master station, the monitoring center computer installed in the substation monitoring center, The bus gateway installed in the power distribution room, the temperature collector installed on the switch cabinet and the passive wireless temperature sensor installed on the surface of the tested component;

The computer of the cross-regional monitoring master station is connected to a plurality of monitoring center computers, and the monitoring center computer is connected to a plurality of bus gateways, and the bus gateway is connected to a plurality of temperature collectors through a communication bus, and the temperature collectors are connected via wireless The radio frequency network is connected to a plurality of passive wireless temperature sensors employing surface acoustic wave temperature sensors.

The temperature collector is connected with a collector antenna, and the temperature collector transmits and receives wireless radio frequency signals through the collector antenna.

The temperature collector is installed outside the switch cabinet, and the collector antenna is installed inside the switch cabinet.

The passive wireless temperature sensor includes: an interdigital transducer, a reflection grid and a piezoelectric substrate, and the interdigital transducer and the reflection grid are arranged on the piezoelectric substrate.

The passive wireless temperature sensor also includes a sensor antenna, and the sensor antenna is electrically connected to the above-mentioned interdigital transducer.

The passive wireless temperature sensor is divided into: a tuning fork type sensor, an inlay type sensor and a binding type sensor.

The communication bus includes: RS485 bus, CAN bus and RS232 bus.

The beneficial effect that the present invention has compared with prior art is:

1. The present invention can realize the passive wireless remote monitoring of the contact temperature of the substation switch cabinet, forming a three-dimensional real-time remote monitoring system, which can meet the temperature detection of various switch cabinet equipment. The whole device has a simple structure and is easy to install and use;

2. No power supply is required, which reduces the high maintenance costs and false alarms generated by the battery. The sensor adopts a passive induction method without battery drive, which reduces the maintenance cost caused by battery replacement and will not affect the ecological environment;

3. Safe and reliable, the wireless temperature sampling method does not need to be connected to the measured point or related supporting structures, and there is no electrical connection between the sensor and the receiving device, thereby realizing high-voltage isolation and ensuring the safe operation of the device;

4. The installation is convenient and flexible. The passive wireless temperature sensor is small in size and wirelessly transmits data with the collector. The installation is convenient and flexible, and it is not affected by the structure and space of the switch cabinet;

5. Good environmental adaptability. The temperature sensor has compensated for the deviation in the sensor production process after being calibrated by the matching software. The sensor can be debugged at any temperature within the working temperature range and will not be affected by seasonal factors.

Description of drawings

Below in conjunction with accompanying drawing, the present invention is described in further detail:

Fig. 1 is a schematic diagram of circuit structure of the present invention;

Fig. 2 is the structural representation of passive wireless temperature sensor among the present invention;

In the figure: 1 is the cross-region monitoring master station computer, 2 is the monitoring center computer, 3 is the bus gateway, 4 is the temperature collector, 5 is the passive wireless temperature sensor, 6 is the collector antenna, and 7 is the interdigital transducer , 8 is a reflection grid, 9 is a piezoelectric substrate, and 10 is a sensor antenna.

Detailed ways

As shown in Figure 1, the on-line monitoring device for contact temperature of substation equipment in the present invention includes a cross-regional monitoring master station computer 1 installed in a cross-regional monitoring master station, a monitoring center computer 2 installed in a substation monitoring center, and a computer 2 installed in a power distribution room. The bus gateway 3, the temperature collector 4 installed on the switch cabinet and the passive wireless temperature sensor 5 installed on the surface of the tested element.

The cross-area monitoring master station computer 1 is connected with a plurality of monitoring center computers 2, and the monitoring center computer 2 is connected with a plurality of bus gateways 3, and the bus gateway 3 is connected with a plurality of temperature collectors 4 through a communication bus, so that Described temperature collector 4 links to each other with a plurality of passive wireless temperature sensors 5 through radio frequency network, and described passive wireless temperature sensor 5 adopts surface acoustic wave temperature sensor; Described temperature collector 4 is connected with collector antenna 6, and temperature collection The device 4 transmits and receives wireless radio frequency signals through the collector antenna 6. The temperature collector 4 is installed outside the switch cabinet, and the collector antenna 6 is installed inside the switch cabinet. The communication bus includes: RS485 bus, CAN bus and RS232 bus.

The invention can realize the passive wireless remote monitoring of the contact temperature of the substation switch cabinet, forms a three-dimensional real-time remote monitoring system, can meet the temperature detection of various switch cabinet equipment, and the whole device has a simple structure and is easy to install and use.

As shown in Figure 2, the passive wireless temperature sensor 5 includes: an interdigital transducer 7, a reflection grid 8 and a piezoelectric substrate 9, and the interdigital transducer 7 and the reflection grid 8 are arranged on a piezoelectric On the substrate 9 , the passive wireless temperature sensor 5 further includes a sensor antenna 10 , and the sensor antenna 10 is electrically connected to the above-mentioned IDT 7 .

The passive wireless temperature sensor 5 is divided into a tuning fork sensor, an inlay sensor and a binding sensor, which are respectively applicable to different environments. The tuning fork sensor is fixed on the surface of the object to be measured with screws, and the inlay sensor uses its own The ring is fixed on the surface of the circular object to be measured, and the bundled sensor is fixed with a cable tie.

The passive wireless temperature sensor 5 is a temperature measuring element directly installed on the surface of the measured object, it is responsible for receiving the inquiry radio frequency signal, and returns the radio frequency signal with temperature information to the temperature collector 4, the passive wireless temperature sensor 5 adopts Surface Acoustic Wave (Surface Acoustic Wave) sensing technology design, the sensor surface wave technology applies the physical properties of crystal materials, the change of the physical properties of the crystal is automatically converted into electrical signals through the principle of piezoelectric induction, the working principle of the sensor is to convert The radio frequency signal is transmitted to the surface of the piezoelectric material, and then the reflected wave affected by the temperature is converted back to an electrical signal to obtain temperature data.

The temperature collector 4 is responsible for communicating with a group of sensors, transmitting a temperature measurement and inquiry radio frequency signal to the sensor, receiving the return signal of the temperature sensor, and analyzing it into temperature information and sending it back to the temperature monitoring master station software system. The collector antenna 6 is embedded in the switch The inner wall of the cabinet, so that it can shield the external radio wave interference, while the other parts of the temperature collector 4 (receiving box) are installed outside the switch cabinet, and the collector antenna 6 is absorbed on the cabinet wall through the gap between the cabinet and the partition , the temperature collector 4 is placed on the top, and the cabinet door can be opened without power failure, which is convenient for managers to operate.

The temperature collector 4 is powered by a separate power supply and transmits a short radio frequency signal into the switch cabinet. If the frequency of the radio frequency pulse is the same as the preset frequency of the temperature sensor, the sensor can receive the radio frequency signal and change and passively Reflecting the pulse signal, the returned pulse signal carries the temperature information of the sensor due to the influence of the temperature of the sensor itself.

The monitoring center computer 2 mainly completes sensor and collector file management, parameter setting, storage of temperature data and provides a data interface with the automation system.

The main functions of the application software of the cross-area monitoring master station computer 1 include various temperature sensor devices, temperature monitoring parameter settings, remote acquisition of temperature information, comprehensive query analysis, and temperature prediction and alarm. According to actual conditions, these application functions can be It exists as a functional module of the power automation system (the temperature information is connected to the power automation system through a standard data interface), and it can also be used as a set of temperature monitoring master station system alone. Various operation management personnel can monitor equipment in a timely and accurate manner through remote access. Contact temperature conditions.

1. A variety of temperature monitoring methods; the system sets automatic collection tasks, regularly collects equipment temperature information according to the established sampling frequency, and saves the temperature data in the database. Users can set the time interval and specify the monitoring object for historical temperature information collection. Query, at the same time, the user can specify a specific switch cabinet or sensor in the master station system for real-time temperature information collection.

2. Complete alarm mechanism; when the absolute value of the switchgear temperature or the rate of change of temperature exceeds the upper limit, the system provides alarm information in various ways such as sound, photoelectric, and text messages for operation and management personnel, and timely or predictive discovery and troubleshooting , so as to ensure the safe and stable operation of power equipment to the greatest extent.

3. Perfect system parameter setting; establish temperature monitoring and management network of switch cabinets at all levels, manage temperature monitoring related equipment, sensors, collectors and other equipment files, and specify switch cabinets or a specific temperature sensor for remote downloading of parameters Sending, including sensor temperature calibration, various warning values, time, temperature collection frequency, sensor transmission power, signal acceptance threshold, etc.

4. Rich data display; on the monitoring object, the system can not only select a group of sensors of a switch cabinet to monitor the temperature information, but also specify the temperature of multiple switch cabinets in an area (such as a station area, a line) Information is monitored. For historical temperature information, the system provides various display methods such as lists and curves, which are convenient for users to view.

5. Fault diagnosis and prediction; the system provides means such as equipment temperature and real-time load comparison, and troubleshoots abnormal temperature conditions. According to the existing temperature data and its variation rules, it provides users with temperature prediction results according to the established prediction algorithm, and Compare the predicted value with the warning value, and send a temperature warning message when it is found that there is a possibility of abnormality.

6. Powerful statistical analysis; the system automatically generates various statistical reports based on historical temperature data, such as statistics on temperature abnormalities by region, voltage level, equipment model, etc. Various statistical reports and KPIs can be released through the system portal.

The embodiments of the present invention have been described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments, and can also be made without departing from the gist of the present invention within the scope of knowledge possessed by those of ordinary skill in the art. Variations.

Claims (7)

1. The online monitoring device for contact temperature of substation equipment is characterized in that: it includes a cross-region monitoring master station computer (1) installed in the cross-region monitoring master station, a monitoring center computer (2) installed in the substation monitoring center, and a monitoring center computer (2) installed in the distribution The bus gateway (3) in the electric room, the temperature collector (4) installed on the switch cabinet and the passive wireless temperature sensor (5) installed on the surface of the tested component; The cross-region monitoring master computer (1) is connected to a plurality of monitoring center computers (2), the monitoring center computer (2) is connected to a plurality of bus gateways (3), and the bus gateways (3) are connected through a communication bus Connected to multiple temperature collectors (4), the temperature collectors (4) are connected to multiple passive wireless temperature sensors (5) through a wireless radio frequency network, and the passive wireless temperature sensors (5) use surface acoustic waves Temperature Sensor. 2. The online monitoring device for substation equipment contact temperature according to claim 1, characterized in that: the temperature collector (4) is connected with a collector antenna (6), and the temperature collector (4) passes through the collector antenna ( 6) Transmit and receive radio frequency signals. 3. The online monitoring device for substation equipment contact temperature according to claim 2, characterized in that: the temperature collector (4) is installed outside the switch cabinet, and the collector antenna (6) is installed inside the switch cabinet. 4. The online monitoring device for contact temperature of substation equipment according to any one of claims 1 to 3, characterized in that: the passive wireless temperature sensor (5) includes: an interdigital transducer (7), A reflection grid (8) and a piezoelectric substrate (9), the interdigital transducer (7) and the reflection grid (8) are arranged on the piezoelectric substrate (9). 5. The online monitoring device for substation equipment contact temperature according to claim 4, characterized in that: the passive wireless temperature sensor (5) also includes a sensor antenna (10), and the sensor antenna (10) is connected to the above-mentioned The interdigital transducer (7) is electrically connected. 6. The online monitoring device for contact temperature of substation equipment according to claim 5, characterized in that: the passive wireless temperature sensor (5) is divided into: a tuning fork type sensor, an inlaid type sensor and a bundled type sensor. 7. The online monitoring device for contact temperature of substation equipment according to claim 5, characterized in that: said communication bus includes: RS485 bus, CAN bus and RS232 bus.

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