The centralized power grid grounding monitoring device is a new product researched and developed by applying the ground capacitance compensation method of the mine low-voltage power grid leakage selection protection system and the mine low-voltage power grid zero sequence current and voltage timing discrimination leakage selection method, using programmable logic technology and ARM SCM management and communication.
Product features:
Advanced leak detection technology
Powerful software and hardware platform
high reliability
Multiple anti-interference measures
Scope of application: 380V, 660V and 1140V low-voltage power grids with neutral point not directly grounded.
Power grid parameters: Phase to ground capacitance of the power grid: 0.22~1.0uF;
Phase to ground capacitance of power grid branch: 0.1~0.33uF;
Monitoring scope: 1 main switch (or mobile substation), 1-32 branch switches.
Fixed value of leak detection function:
Neutral point voltage: 2V~100V
Insulation value to ground: 0-999K Ω
Delay range of grounding line selection: 10ms~300ms
Measurement range: Neutral point voltage: 2V~100V
Insulation monitoring: 0-999K
Contact capacity: allows long-term current flow of 8A and cut-off current of 0.3A
