Low voltage inverse power transmission automatic disconnecting device for power distribution network

Abstract

The invention relates to a low voltage inverse power transmission automatic disconnecting device for a power distribution network. The device has a structure as follows: a clamping slot is formed in a shell, an electromagnetic coil is fixed in the clamping slot, two control electrodes of the electromagnetic coil are connected with a live wire and a null wire of a power grid side circuit via contacts on the shell; a magnet yoke is connected with the coil and fixed, the upper side of the magnetic yoke is connected with one end of an upper spring, the other end of the upper spring is connected with an upper armature, the lower side of the magnetic yoke is connected with one end of a lower spring, and the other end of the lower spring is connected with a lower armature; the upper and lower armatures of the spring are connected with an upper reaction spring and a lower reaction spring, respectively; a movable contact is fixed on the lower armature, a fixed contact is fixed on the shell, and the movable contact and the fixed contact are corresponding to each other. The device provided by the invention has the functions of automatic tripping when no voltage exists and automatic switching-on when voltage exists, and is used for preventing a user side from inversely transmitting power to the power distribution network, when a distribution line is interrupted for maintenance, and thus security of maintenance staffs is ensured.

Description

technical field [0001] The invention belongs to the field of electric equipment, and in particular relates to an automatic cut-off device for low-voltage reverse power transmission of a distribution network. Background technique [0002] With the advancement of technology and the development of science and technology, my country's new energy technology has ushered in a spring of development. Especially in the photovoltaic industry, with my country's subsidies for new energy technologies and the overcapacity of the entire industry, the price of solar panels, the most important photovoltaic power generation technology, has dropped year by year, and the cost of a complete set of small photovoltaic power plants has dropped to an acceptable level for ordinary residents , making it possible to establish a photovoltaic solar grid-connected power generation system with a family as a unit. At the same time, according to relevant national documents, the State Grid Corporation of China...

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problems existing in the above-mentioned prior art, the present invention provides an automatic cut-off device for low-voltage reverse power transmission of the distribution network, which solves the problem in the prior art that when the power grid needs maintenance and power failure, it is very easy to cause reverse power transmission of the power supply line

Images