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SMR-TNEP phase-to-ground short-circuit monitoring and protection device
- Description
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1. Product Overview
According to Article 2 of 8.2.3 and Article 2 of 8.7.1 of DL5153-2014 Technical Regulations for Design of Auxiliary Power Supply in Large Thermal Power Plants, low-voltage feeders and motors below 100KW are protected by phase-to-phase short circuit protection which also serves as grounding protection. When the sensitivity cannot be met, additional grounding short circuit protection should be installed. Due to the difficulty in judging sensitivity and the need for control investment, most have not installed zero-sequence protection. After operation, there have been fault phenomena such as single-phase grounding of feeders or motors below the secondary bus, and the zero-sequence protection of the primary bus feeder tripping at a higher level.
The SMR-TNEP phase-to-ground short circuit monitoring protection device is suitable for power plants, coal, steel, textiles, and other 400V TN systems. It can solve the problem of small resistance grounding in MCC lines, and the failure of molded case circuit breakers and thermal relays to operate, which causes PC to trip at a higher level, leading to widespread power outages. The phase-to-ground short circuit monitoring protection device continuously monitors the zero-sequence CT current of each circuit, and after meeting the conditions, it first alarms and then trips, cutting off the power supply to the faulty line to protect equipment and avoid significant economic losses caused by higher-level tripping.
2. Product Features
1) Real-time monitoring
2) Secondary warning and tertiary tripping function
3) High sensitivity and small Size zero-sequence current transformer
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