Small Current Grounding Line Selection Device

Small Current Grounding Line Selection Device

SHNIS-I
The device adopts a high-reliability industrial-grade "fully embedded" structure, adopts a comprehensive line selection algorithm combining steady-state and transient quantities, and uses fuzzy theory for information fusion. After the fuzzy information fusion between multiple fault line selection methods is completed, each line will calculate a comprehensive fault measurement coefficient, that is, the line fault credibility coefficient, which greatly improves the accuracy of line selection in complex situations.

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The device has fault recording function, tripping function, wheel cutting function, post-acceleration tripping function, etc., and fully complies with the latest "DLT872-2016 Technical Conditions for Single-Phase Grounding Fault Line Selection Device for Small Current Grounding System" and "QCSG1203068-2019 Technical Specifications for Small Current Grounding Line Selection Device" and other standards and specifications. The device is suitable for power systems with voltage levels of 66kV and below (ungrounded, grounded systems with small resistors or arc suppression coils) or new energy stations that require rapid fault removal.
1. It has 2 standard RS-232 interfaces, 2 standard RS-485 interfaces, 1 standard IRIG-B code timing interface, and 4 10/100M Ethernet ports. 2. It can connect 2 groups of three-phase voltages, 4 zero-sequence voltages, and 36 zero-sequence currents. Or it can connect 6 zero-sequence voltages and 42 zero-sequence currents in total, without three-phase voltage input. 3. Action performance a) Alarm delay setting range: 0s~7200s b) Trip delay setting range: 0s~7200s c) Line selection tripping action time error: When the delay setting value is not greater than 0.5s, the whole group time is not greater than 540ms When the delay setting value is greater than 0.5s, the error is not greater than 0.5% or 40ms d) The accuracy of the first line selection tripping: not less than 90%.