The main functions of the digital leakage current meter for lightning arresters are:

Automatic monitoring function

Periodic automatic monitoring of lightning arrester's full current, resistive current, number of actions, and action time. The resistive current is implemented based on the third harmonic current vector inversion method.

Wireless communication function

This function is mainly for 4G/LoRa wireless communication of lightning arrester monitoring device. Upload the characteristic data of the lightning arrester to the station aggregation node device through 4G/LoRa communication.

The device communication complies with the "Q/GDW 12020-2019 Transmission and Transformation Equipment Internet of Things Micro Power Wireless Network Communication Protocol", and can be directly connected to the perception layer of the transmission and transformation Internet of Things without the need for other configurations.

Local display function

The lightning arrester action count is displayed using a 3-digit electromagnetic counter. The full current is displayed on a scale (the scale range can be configured). The scale has a normal area (green), a caution area (yellow), and an alarm area (red).

Self powered function

The digital meter for lightning arresters has the functions of extracting energy from lightning arrester leakage current and supplying power to primary batteries.

Alarm function

Equipped with abnormal alarm function, real-time alarm will be triggered when monitoring data exceeds the standard or monitoring function fails. The alarm settings can be modified, and the alarm information can be uploaded in real time.

Meter appearance

The device adopts a meter style appearance structure, which is consistent with the installation size of traditional lightning arrester monitors and can be directly replaced for installation.

Main performance parameters:

Performance: Meets the Technical Specification for Smart Substations Part 4: Digital Remote Transmission Meter (Q/GDW 12355.4-2023);

Power supply (P): 5: Leakage current energy harvesting; 6: A high-energy battery; 7: Leakage current energy harvesting+primary high-energy battery; ?

Display: Electromagnetic counter and ammeter;

Ampere meter range (L): 3:3mA; 5：5mA； 10:10mA;

2mS square wave impulse current withstand (F): 1: ＜ 1200A; 2：[1200A,2500A]；

Monitoring: full current, number of actions, resistive current (Z3); ?

Communication(T): 1: LoRa; 2:4G; 3: WAPI;