Automated Protection Type
Key words:
SMR-WXC Microcomputer Resonance Elimination Device
Applicable to small current power supply systems with voltage levels of 380V, 3kV, 6kV, 10kV, 35kV, and 66kV, where the neutral point is ungrounded or grounded through an arc suppression coil. When the system experiences ferromagnetic resonance, grounding, or overvoltage faults, it eliminates and records ferromagnetic resonance faults, and monitors and records single-phase grounding and overvoltage faults. Note: This device can only eliminate non-permanent ferromagnetic resonance faults induced by external causes; it cannot eliminate other PT overvoltages caused by persistent external factors.
Key words:
SMR-WXB Microcomputer-type Resonance Elimination Device
Suitable for low-current power supply systems with voltage levels of 380V, 3kV, 6kV, 10kV, 35kV, and 66kV, where the neutral point is not grounded or is grounded through an arc suppression coil. When the system experiences ferroresonance, grounding, or overvoltage faults, it eliminates and records ferroresonance faults, and monitors and records single-phase grounding and overvoltage faults. Note: This device can only eliminate non-permanent ferroresonance faults induced by external causes; it cannot eliminate other PT overvoltages caused by persistent external factors.
Key words:
SMR-WXA Microcomputer Resonance Elimination Device
Applicable to small current power supply systems with voltage levels of 380V, 3kV, 6kV, 10kV, 35kV, and 66kV, where the neutral point is ungrounded or grounded through an arc suppression coil. When the system experiences ferromagnetic resonance, grounding, or overvoltage faults, it eliminates and records ferromagnetic resonance faults, and monitors and records single-phase grounding and overvoltage faults. Note: This device can only eliminate non-permanent ferromagnetic resonance faults induced by external causes; it cannot eliminate other PT overvoltages caused by persistent external factors.
Key words:
SMR-ZN09A Small Current Ground Selection Device
Most of the 3kV to 66kV distribution networks in our country adopt a small current grounding method, which is a non-effective grounding method for the neutral point, including neutral point ungrounded systems and neutral point grounded systems through arc suppression coils or large resistors. The advantage of the non-effective grounding system is that it can automatically extinguish arcs and restore insulation in most cases when a single-phase ground fault occurs. However, when a permanent ground fault occurs, in order to prevent the fault from expanding due to the voltage rise of the non-fault phase, it is necessary to quickly identify the fault line and cut it off, which raises the issue of single-phase ground fault line selection. This issue has not been well resolved for a long time, restricting the development of distribution network automation.
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