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

Automatic monitoring function

Periodic automatic monitoring of the full current, number of actions, and action time of the lightning arrester.

Data storage function

It has the function of saving and exporting historical data, and can automatically store 10000 monitoring data periodically.

communication function

Equipped with remote data upload function, meeting the data communication requirements of Part 4 of the Technical Specification for Smart Substation - Digital Remote Transmission Meter (see Appendix 1).

alarm function

Equipped with abnormal alarm function, real-time alarm will be triggered when monitoring data exceeds the standard, monitoring function fails, communication interruption and other abnormalities occur. The alarm settings can be modified, and the alarm information can be transmitted remotely in real time.

Local display function

The lightning arrester action count is displayed using a 3-digit mechanical counter. The full current is displayed using a mechanical pointer meter.

Appearance of the device

The appearance structure of the device is consistent with the installation dimensions of traditional lightning arrester monitors, and can be directly replaced for installation.

2. Technical indicators for digital leakage current meter of lightning arrester:

3. Electromagnetic compatibility performance

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

Power supply: DC24V; ?

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

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]；

Communication method: RS485; ?

Communication protocol: MODBUS-RTU;