Wireless lightning arrester leakage current sensor

Overview

Metal oxide lightning arrester(abbreviation)MOA）Due to its mature protective performance, valve disc, and manufacturing process quality,It has been widely used in the power system. In order to meet the requirements of modern power Internet of Things construction, fully utilizing modern wireless data acquisition technology for wireless data collection and monitoring of lightning arresters in the station can achieveMOAAutomatic wireless operation statusCentralized monitoring facilitates wireless ubiquitous IoT monitoring of the operating status of equipment such as lightning arresters within the station.

system architecture

Wireless lightning arrester leakage current sensorThe structure is shown in Figure 1.

image 1 Structure diagram of wireless monitoring system for lightning arrester based on power Internet of Things

The system is equipped with lightning arrester wireless intelligent state sensors with ubiquitous IoT functions, collection nodes, access nodes, and communication lines such as optical fibers. The lightning arrester uses wireless intelligent state sensing sensors. According to the construction requirements of the ubiquitous Internet of Things, LoRa wireless communication mode is adopted for self-organizing wireless local area network, which meets the "Communication Protocol for Micro Power Wireless Access Network of Power Equipment Sensors" and has passed interconnection testing. It can be directly applied to the lightning arrester state monitoring system of the ubiquitous Internet of Things.

In addition, the power IoT network monitoring system also has an open feature, which can easily connect other monitoring devices that can meet IoT access standards in the station, achieving ubiquitous IoT intelligent perception and comprehensive monitoring of the entire station.

The key device in this system is an intelligent sensor for lightning arresters based on LoRa wireless communication technology. Its characteristic is that it can meet the requirements of ubiquitous IoT for lightning arrester status monitoring without the need for any external power supply, providing real-time online wireless monitoring and on-site display of lightning arrester operation status. This intelligent sensor fully utilizes the leakage current of the lightning arrester to provide energy, avoiding maintenance issues caused by the use of batteries or external power supply. In addition, the wireless intelligent monitor can automatically record and store the continuous current during the initial operation of the lightning arrester without loss, and use longitudinal comparison method to accurately judge the operating status of the lightning arrester. The on-site display part adopts a large screen LCD display to simultaneously display the initial continuous current, current continuous current, and total number of current actions, making it easy to observe from a distance. Its external dimensions and installation method are compatible with traditional monitors. The wireless transmission part complies with the requirements of the State Grid's "Communication Protocol for Micro Power Wireless Access Network of Power Equipment Sensors", and can be directly upgraded and replaced with ubiquitous IoT wireless intelligent sensors on site without any modifications. It is compatible with all functions of traditional online monitors and meets the requirements of ubiquitous IoT wireless monitoring.

Technical Specifications

3.1 Characteristics parameters of continuous current measurement for lightning arrester

Voltage level: 35kV~500kV

Rated current: 20mA

Measurement range: 0.1~10mA
Measurement accuracy: ≤ 2%
Working current:>0.1mA

3.2 Characteristics parameters of lightning arrester action monitoring

Upper limit operating current (8/20 μ S): 20 kA (peak)

Lower limit operating current (8/20 μ S): 50 A (peak)

Square wave current (2mS): 1500A (peak)

High current (4/10 μ S): 100kA (peak)

Nominal current: 20kA

3.3 Characteristics and Parameters of Wireless Remote Transmission

Wireless communication: LORA modulation

Communication distance:<1000m (under open conditions)

Transmission power: ≤ 100mW

Carrier frequency: 2400~2483.5MHz

Air speed: 2.4kbps

Sending cycle: 5 minutes

Transmission content: full current, number of actions, operating status, initial operating current

Overall dimensions