Research On The Electromagnet Lock Of Earth Fault Protection For 10kV Switchgear

At the present time, in the most of the cities, the ring cubicle switch gear is the main equipment in power supply network. Most of the power supply network is designed as a ring, this design promotes the continuum and reliability. Followed with the extensive use of ring cubicle switch gear and the ring is bigger and bigger, it comes a big problem—fault operating on the earth switch. The fault will damage the power supply network seriously.Now most of the cubicle switch gear had the lock between main switch and the earth switch, it means when the main switch is closed the earth switch could not be operated. But if the main switch is open and the line is still conducted, the ring cubicle switch gear could not provide the protection of fault operation. This situation asks a kind of earth switch fault protection.In this word we will presentation a kind of earth fault protection equipment.The equipment relate to electric engineering electron engineering and new power. It use the high voltage CT get power from the 10kV power supply network and charge the storage battery. Or use the solar as the power supply to the battery. The battery is the direct power to the whole system to insure the reliable of the system. In the same time this design solve the problem where had no low voltage power supply. The system is connected to the electric vision part of the ring cubicle switch gear from a at least as 1 M? high resistance measure electro circuitry. The whole system changed the signal whether the line is connected or not to a digital signal to control the electronic lock. To the electric vision of the ring cubicle switch gear likes connected to a high resistance. This system solve the problem of 10kV ring cubicle switch gear earth switch fault operating without the signal from the electric vision equipment. This system is not expensive easy mounted and green.