METHOD OF ELECTRICITY LEAKAGE DETECTION AND PREVENTION OF ELECTRICAL EQUIPMENT'S OUTER SURFACE AND SYSTEM THEREOF

摘要

Disclosed in the present invention are a method of electricity leakage detection and prevention of electrical equipment's outer surface and system thereof. The method and system are used for detecting and preventing electricity leakage of the electrical equipment's outer surface caused by defective insulation and power supply connection faults. Without in touch with the electrical equipment's outer surface, the electricity leakage of the outer surface can be detected and the connection between the electrical equipment and the power supply can be cut and an alarm is made by means of the current channel (2) formed between the electrical equipment neutral line (N′) and the electrical equipment's outer surface (G′) and the monitoring of the current value. A power supply channel (5) is set up to make sure that the electrical equipment can be normally operated via the system even in the condition of the power supply connection faults. According to the method and system, the electricity leakage of the outer surface can be correctly detected and the alarm can be made or the connection between the electrical equipment and the power supply can be cut even if the electrical equipment's outer surface is not grounded. With the advantage of simple construction and low cost, the system can be widely used.

主权项

1. A method of electricity leakage detection and prevention of electrical equipment's surface comprising:
Monitoring the current between equipment's neutral line and equipment surface; if the current between equipment's neutral line and equipment surface is detected larger than the preset threshold, tripping the amplification and execution circuit to alarm or remove the power supply to the equipment.