Neutral point grounding resistor cabinet serves as specialized equipment designed for the protection of transformers or generators' neutral points in power systems. It guarantees safe operation by restricting grounding fault current, mitigating overvoltage, and providing real-time monitoring of system conditions.
1. Core Functions
- Fault Current Limiting: When a single-phase grounding fault occurs, the current flows through the resistance cabinet, accurately limiting the fault current within the set range (5-2000A adjustable) to prevent equipment overheating and damage.
- Overvoltage Suppression: Limits the rise of neutral point voltage, effectively suppressing operational and arc overvoltage, reducing harm to equipment and personnel.
- Intelligent Monitoring: Real-time monitoring of grounding current, neutral point voltage, and resistance temperature, triggering sound and light alarms (electric bells and warning lights) when limits are exceeded. Built-in temperature and humidity controller, automatically starting and stopping fans/heaters, suitable for complex environments.
2. Core Structure and Configuration
- Resistance Unit: Made of high-stability stainless steel or iron chromium aluminum alloy, with high temperature resistance (up to 1500°C) and stable resistance (temperature coefficient as low as 0.000225/°C). Modular grid design, supporting series-parallel combinations (500Ω-1000Ω tap adjustment), ensuring high heat dissipation efficiency.
- Monitoring and Protection System: Instrument room equipped with current transformers, voltage relays, and leakage current relays for real-time fault signal detection. Intelligent controller records fault data (saves 30 historical records) and supports remote monitoring using the 61850 communication protocol.
- Cabinet Design: Optional indoor/outdoor types with protection levels of IP54/IP65 and a stainless steel welded frame resistant to salt spray corrosion. Clear functional zoning (independent isolation of resistance unit, control unit, and heat dissipation unit) for easy maintenance.
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