LH700 Fault Current Quick Identification and Protection Device Introduction: The LH700 fault current rapid identification and protection device for high-voltage distribution systems with a voltage of 40.5kV and below does not require the configuration of traditional current transformers or complex secondary wiring. The fault current can be identified at the moment of fault occurrence, and the fault feeder circuit breaker can be activated through relay contacts to achieve automatic isolation of the fault point or provide fault indications for later fault troubleshooting. Features: 1. Ultra low power design; 2. Powered by high-energy batteries, with a range of more than 10 years; 3. Using current sensors to replace traditional expensive and bulky electromagnetic CT or electronic CT; 4. The response time of fault current is as low as 1ms; 5. Adopting a three-phase fault code interval transmission strategy to avoid data loss due to receiving port congestion; 6. Band tied structure, high-voltage equipotential installation; 7. Design with strong EMC anti-interference ability; 8. The current sensor is equipped with a high-frequency interference signal filtering circuit to prevent transient current disturbances such as lightning; 9. Innovative technology, ultra-low cost. Technical parameters: Working power supply: Built in high-energy battery, with a range of more than 10 years Air environment: temperature -20 ℃~+125 ℃, humidity 0-99% RH (no condensation) Communication interface: IoT module, transmission power of 17dBm, line of sight communication distance greater than 1000m Work and alarm indication: dual color LED light: used for indicating normal operation, battery undervoltage, and fault current identification Setting of fault current threshold ETH: Built in precision potentiometer Fault current identification time: ＜ 20ms. If the fault current level is greater than 1.2ITH, the recognition time is less than 1ms Transmission time of three-phase fault code: 80-220ms Shell material and external dimensions: silicone rubber material, 45mm x 45mm x 16mm (length x width x height) Installation method: High voltage equipotential, strap type installation
Introduction: The LH700 fault current rapid identification and protection device for high-voltage distribution systems with a voltage of 40.5kV and below does not require the configuration of traditional current transformers or complex secondary wiring. The fault current can be identified at the moment of fault occurrence, and the fault feeder circuit breaker can be activated through relay contacts to achieve automatic isolation of the fault point or provide fault indications for later fault troubleshooting.
