Online temperature measurement device for switchgear

Description :

　　Background of wireless temperature measurement system construction

　　1.1 Equipment scale

　　The power distribution project of this rolling mill consists of a 10kV switchgear and two substations, 1 # and 2 #, with a total of 21 medium voltage switchgear cabinets. Among them, the medium voltage switch is a mid mounted switchgear for vacuum circuit breakers, using 150VCP-W50 vacuum circuit breakers imported from Eaton in the United States and VD4 vacuum circuit breakers produced by ABB.

　　1.2 Current Status of Equipment Operation and Maintenance

　　In daily operation, 10kV switches have the characteristics of long live operation time, high operating current, and few opportunities for power outage maintenance and repair. Moreover, due to the five prevention design, the switch cabinet door cannot be opened due to locking. It is difficult for operation and maintenance personnel to effectively monitor the temperature of hot parts of the switch cabinet, such as dynamic and static contacts, outgoing busbars, etc., relying solely on temperature measuring guns or infrared imaging devices. From 2013 to 2015, this power distribution project experienced accidents that affected the safety and stability of the distribution room, such as the overheating and tripping of the 1AH6 incoming line switch contacts causing busbar power loss, and the overheating and tripping of the 1AH10 incoming line switch contacts causing busbar power loss.

　　The main reason for the above accidents is the lack of effective online monitoring methods, which makes it difficult to effectively prevent overheating faults. When the switch components heat up, they cannot be dealt with in a timely manner, resulting in switch damage and even non-stop operation of the distribution room. In short, the 10kV switch of this distribution project cannot meet the requirements for safe and stable operation of the distribution room.

　　Wireless temperature measurement product case This project is the off-site power supply and distribution project for the T1 terminal of Nanjing Lukou International Airport. The airport currently has a 10kV switchgear, which was renovated from the original 35kV central substation and constructed in 1996. The main line of the 10kV system operates in sections with a single busbar, and the busbar is equipped with a self switching device. There are 50 10kV side outgoing lines, and the switch cabinet adopts ZCN1 handcart cabinet. The reactive power compensation adopts a semi enclosed complete capacitor compensation device, and the station transformer has a capacity of 200kVA. All 10kV substations are equipped with dual circuit power supply, which is led out from the 10kV I and II busbars of this switching station.

　　The 10kV power supply system of Nanjing Lukou Airport adopts a radial power supply method, with a total of 46 10kV/0.4kV substations set up. Each 10kV substation is an internal substation of the airport, with its main protection, metering, and dispatch centralized in the 10kV switching station and 10kV central substation. The 10kV outgoing circuits of the airport are reorganized according to their functional purposes, with the 110kV substation as one station responsible for supplying power to important loads such as T1 and T2 terminals, and the 10kV switching station as the second station responsible for supplying power to production ancillary facilities. The T1 terminal requires a total of 16 incoming lines. According to the 10kV power supply conditions of the 110kV substation, it is proposed to change the 12 10kV power supply cables of the T1 terminal from the 10kV switchgear to the 110kV substation for power supply. In addition, the transformer power supply for the 2 intermediate frequency power supplies and aircraft air conditioning will be supplied by the newly added 10kV distribution equipment, and the high-voltage refrigeration unit will be provided by this station.

　　Product Requirements

　　For the off-site power supply and distribution project of the T1 terminal of Nanjing Lukou International Airport, wireless temperature measurement products need to be configured. The requirements for this project are as follows:

　　1) Implement 6-point online temperature measurement for the contact wall of the circuit breaker, and it is recommended to set the temperature measuring element on the contact wall side of the circuit breaker to avoid any impact on the external electric field. It is also necessary to complete the factory test verification with the switchgear and circuit breaker as a whole. Ensure safety and reliability during use;

　　2) Perform temperature rise analysis based on real-time operating status such as dynamic load and environment, in order to determine whether the switchgear is operating normally or to issue alarms (non set value alarms);

　　3) The power supply components adopt self powered technology and do not require external power supply;

　　4) After exchanging circuit breakers of the same specifications, temperature rise monitoring of the circuit breakers inside the cabinet can be achieved; The working environment temperature of the sensor meets the requirement of -40 ℃ to+120 ℃.

　　Based on the above requirements, ATE300 CT induction power sensor is selected. In addition, the original plan was to use a 7-inch touch screen ARTM-7062HT-4 (HI) - W wireless temperature measurement centralized on-site display device. Considering cost factors, it was chosen to directly connect the backend system with an ATC400 transceiver. The application of Ankerui wireless temperature measurement products in the off-site power supply and distribution project of the T1 terminal of Nanjing Lukou International Airport is aimed at monitoring the temperature of the electrical connection points of the circuit breaker contacts in the high-voltage switchgear. With the increasingly convenient development of transportation, airport safety is particularly important. To prevent safety issues caused by excessive contact resistance and heating due to oxidation, looseness, dust, and other factors, it is necessary to monitor the temperature online, timely, continuously, and accurately reflect the operating status of equipment, avoid safety accidents, and reduce equipment accident rates.

　　 ARTM series electrical contact online temperature measurement device

　　1 Product Introduction: Online Temperature Measurement Device for Switchgear

　　Function:

　　ARTM Pn wireless temperature measurement device: The ARTM Pn wireless temperature measurement device can be installed separately in high-voltage cabinets and low-voltage drawer cabinets. Each device can receive data from 18 sensors, and sensor models can be selected as ATE100, ATE200, or ATE300. The device is equipped with a 485 interface, which can upload the collected temperature data to the monitoring center.

　　ARTM8 Temperature Inspection Instrument: The ARTM series temperature inspection and control instrument is suitable for measuring and controlling one or multiple temperatures, mainly used for temperature inspection, measurement and control in thermal power plants, hydropower stations and other occasions. Measure the temperature of Pt100 in 8 channels, and any channel can also be shielded. Each channel temperature measurement corresponds to 2 alarm segments, and the relay output can be set to any alarm direction and value.

　　Wireless temperature measurement centralized collection touch screen: The wireless temperature measurement touch screen can be embedded and installed in high-voltage cabinets and low-voltage drawer cabinets. Each device can receive data from 240 sensors and can be optionally used with ATE100, ATE200, and ATE300 sensors. The device is equipped with a 485 interface and an optional Ethernet port, which can upload the collected temperature data to the monitoring center.

　　Application scope:

　　Suitable for temperature monitoring of cable joints, circuit breaker contacts, knife switch switches, high-voltage cable intermediate heads, dry-type transformers, low-voltage high current equipment, etc. inside high and low voltage switchgear.

　　Ordering Example:

　　Technical requirements: Passive wireless temperature measurement with 6-point circuit breaker contacts and 3-point busbar in one high-voltage cabinet

　　Auxiliary power supply: AC/DC 220V

　　Display mode: standalone wireless temperature display

　　In summary, the confirmed model is: wireless temperature measurement device: ARTM-P9-300, 1 unit; Wireless temperature sensor: ATE300, 9 pieces

　　Ordering Example:

　　Technical requirements: Wireless temperature measurement for 6-point circuit breaker contacts and 3-point busbar in 10 high-voltage cabinets

　　Wireless sensor requirements: battery powered, wireless

　　Display mode: centralized wireless temperature display

　　In summary, the confirmed model is: Wireless temperature measurement centralized touch screen: AARTM-7062HT-4 (HI), 1 unit; Wireless temperature sensors: ATE200,90 pieces; Wireless temperature measurement transceiver: ATC200,10

　　Ordering Example:

　　Technical requirements: Wireless temperature measurement for 6-point circuit breaker contacts and 3-point busbar in 10 high-voltage cabinets

　　Wireless sensor requirements: Passive wireless

　　Display mode: centralized wireless temperature display

　　In summary, the confirmed model is: wireless temperature measurement centralized touch screen: ARTM-7062HT-4 (HI), 1 unit; Wireless temperature sensors: ATE300, 90 pieces; Wireless temperature measurement transceiver: ATC400, 1 unit; Power module: ARTM-KDYA-DG30-24K, 1 unit.

　　2 Technical parameters

　　3 External dimensions

　　Wireless Temperature Measurement System Solution

　　The structure of the wireless temperature online monitoring system for substations is divided into three layers: the main station layer, the communication layer, and the equipment bay layer (see Figure 1).

　　The main station layer is responsible for the collection, statistics, analysis, and calculation of temperature measurement data, and automatically generates reports, supporting printing functions. At the same time, the main station level equipment supports remote data transmission, which can transmit temperature data from the substation to the monitoring center, dispatch center, or centralized control station of the power supply bureau to achieve unmanned operation. The communication layer uploads the temperature data of each measurement point to the on-site management machine through short-range wireless automatic network communication. Due to the use of wireless communication technology, the construction amount is very small, and there is no need to lay communication cables, saving equipment installation time. It is particularly suitable for the renovation of old stations and solves the problem of communication cables being burned due to heat attached to the surface of the measured object.

　　The equipment compartment is installed on the surface of the object being tested. It consists of two parts: one is the temperature measurement part, which uses temperature sensors installed at measurement points to measure the operating temperature of the equipment, and then converts the measured analog temperature data into digital signals; The second is the wireless communication module, which is responsible for transmitting the collected temperature data to the on-site management machine in a short-range wireless manner.

　　The main features are:

　　1. Adopt a layered, distributed, and dispersed structure. The system configuration is free and flexible, and can be expanded or reduced according to actual situations without the need for system reconstruction. The software adopts object-oriented programming technology, with a user-friendly interface for human-machine communication, easy to operate and maintain.

　　2. Use wireless transmission to achieve centralized monitoring of multiple data collection points. Each on-site management machine can be responsible for managing multiple temperature measurement terminals. Wireless communication is used between the temperature measurement terminals and the on-site management machine, without any cable connection, making construction fast and convenient. It is suitable for both old station renovation and new substation construction.

　　3. By combining multiple communication methods such as wireless and Ethernet, the system is easy to expand. As needed, the system can support multiple communication methods such as wireless and Ethernet, and can remotely transmit temperature data from the backend system to the dispatch center or centralized control station, meeting the requirements of unmanned substations.

　　4. Standard protocols can be directly integrated into the operation of "integrated automation" or form their own systems. The system supports multiple communication protocols and can be networked with multiple systems, such as MIS, integrated automation systems, and scheduling systems.

　　5. A stable and reliable intelligent temperature sensor, which has undergone special processing and has strong anti-interference ability, greatly enhancing communication reliability. To adapt to different installation scenarios and methods, various temperature sensor housings have been developed, such as metal stainless steel housings, aluminum alloy housings, flame-retardant engineering plastic housings, etc., which can be conveniently installed in outdoor switches, copper busbars, circuit breaker knife switch contacts, cable joints, circuit breaker contacts, and other parts.

　　6. The alarm mode can be set to include multiple methods such as pushing the alarm window on the monitoring background screen, sound, and light signal alarms. The alarm records can be queried and printed in the monitoring background.

　　7. Real time and online temperature data can be collected, and the interval between data collection and transmission can be adjusted through a fixed value setting method. Users can flexibly adjust it according to their actual needs.

　　8. There is no direct connection between the measuring point and the receiving point, so there is no need to consider insulation issues, and the trouble of wiring inside the switchgear is also eliminated.

　　Wireless temperature measurement system architecture for this project

　　The wireless temperature measurement and monitoring system for this power distribution project mainly consists of data acquisition, data transmission, and main station monitoring. Each circuit breaker handcart contact of the medium voltage switchgear needs to be equipped with a wireless temperature measurement device. The temperature of the nodes in each cabinet is converged to the backend system through a 485 communication port.

　　data collection

　　The contact temperature collection of this system consists of wireless temperature sensors, transceivers, and temperature measurement terminals. The wireless temperature sensors are directly installed at the heating nodes in the distribution cabinet, and the temperature measurement data is sent to the transceiver through wireless RF technology. The transceiver then sends the data to the temperature measurement terminal for display, and the temperature measurement terminal can transmit it to the monitoring main network. The wireless temperature measurement terminal of this project adopts the ASD320-P6 intelligent control wireless temperature measurement integrated device, the wireless temperature measurement sensor adopts the ATE200, and the transceiver adopts the ATC100.

　　The entire system consists of a 10kV switch station wireless temperature measurement subsystem, a 1 # substation wireless temperature measurement subsystem, a 1 # substation wireless temperature measurement subsystem, and a main station

　　The 10kV wireless temperature measurement system used in this power distribution project has been tested and proven to meet the requirements for safe and stable operation on site. Realizing online real-time monitoring of switch temperature not only reduces the maintenance and repair workload of switch equipment, but also effectively prevents major accidents, which is of great significance for ensuring the normal operation of 10kV equipment in power distribution projects. At the same time, it has certain reference and guidance value for other companies to carry out equipment wireless temperature measurement device transformation work.

　　Online temperature measurement device for switchgear

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• Online temperature measurement device for switchgear