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SMR-DFS-S Station Type Distributed Low Current Grounding Selection Device
- Description
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1. Product Overview
The SMR-DFS-S station-type distributed low current grounding selection device does not require measuring zero-sequence voltage and zero-sequence current signals. It only needs to collect the phase current and phase voltage signals of this line to perform single-phase grounding fault selection, without relying on communication and other line information, thus achieving on-site grounding fault selection, positioning, and rapid isolation. It is suitable for single-phase grounding fault on-site judgment in substations or switching stations with low current grounding systems (ungrounded, arc suppression grounded, low resistance grounded) for single outgoing lines.
2. Product Features
Selection function: Generally, only three-phase current and three-phase voltage are collected, without the need to collect zero-sequence voltage and zero-sequence current, to complete the selection function; in extreme cases, only collecting three-phase current can also complete the selection.
Short circuit identification function: When a short circuit fault occurs downstream of the detection point, it can accurately determine the short circuit path, and automatically revert after the fault disappears.
Tripping function: The tripping function is realized by connecting to the protection tripping circuit. The tripping function of the device can be set for operation and tripping delay.
Phase identification function: When a grounding fault occurs in the system, it can accurately identify the phase of the grounding fault.
On-site grounding fault identification: This device can perform single-phase grounding fault selection without measuring zero-sequence voltage and zero-sequence current signals, completely independent of communication and other line information, thus identifying the grounding fault of this line.
Precise grounding fault selection: Relying on the domestically leading and innovative high-precision open-type phase current transformer technology, it can accurately synthesize high-precision zero-sequence current (meeting 0.2S level) signals using three-phase phase currents. The station-type distributed selection device can accurately identify fault currents ≥1A, reliably solving on-site identification of high-resistance grounding faults within 5K and on-site identification of zero-crossing grounding faults without any transient process.
Flexible installation: Each outgoing line independently installs a set of equipment, which is the distributed low current grounding selection device. It can also be flexibly installed in batches according to user needs (prioritizing installation on lines that are prone to faults) and power outage arrangements (installing first on lines scheduled for power outage maintenance). The distributed low current equipment uses intelligent wireless communication with the main station equipment (remote communication gateway) in the station, making on-site layout convenient. The distributed low current equipment can flexibly join the system without complex secondary line long layout, arranged nearby in the cabinet, facilitating construction.
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