Three-phase unbalance protection method for low-voltage electrical equipment

Abstract

The invention relates to a three-phase unbalance protection method for low-voltage electrical equipment. The three-phase unbalance protection method is characterized by comprising the specific steps that: a, a low-voltage main line and branch lines from a public transformer outgoing line to a house-service meter power side adopt a three-phase four wire system, reduce circuity and avoid crossed crossing; b, phase lines and null lines of an overhead or cable line are arranged according to a sequence of A, B, C, O lead wires with different colors or identifiers; c, before a low-voltage line is set and electric energy meters are arranged in an inserting coil centralized manner, single-phase load electricity utilization users under a distribution transformer are subjected to unified planning, allocated to three phases of the low-voltage line evenly and are recorded; d, and after the electric energy meters are arranged in an inserting coil centralized manner, whether actual operating three-phase loads of a low-voltage power grid is within a balance degree range is checked again, if not, then adjustment is carried out. The three-phase unbalance protection method is scientific and reasonable in design, has the advantages of avoiding the occurrence of unbalance phenomena and ensuring stable operation of the electrical equipment, and has high innovativeness.

Description

technical field [0001] The invention belongs to the field of electric power, in particular to a three-phase unbalance protection method for low-voltage electrical equipment. Background technique [0002] With the development of low-voltage power grid, the number of low-voltage electrical equipment is increasing day by day. In actual use, the disconnection and grounding accidents of power lines will cause the imbalance of three-phase voltage, which will easily cause the burning of three-phase low-voltage electrical equipment, thus threatening the safe operation of low-voltage electrical equipment. Contents of the invention [0003] The purpose of the present invention is to provide a three-phase unbalance protection method for low-voltage electrical equipment that avoids unbalanced phenomena and ensures stable operation of the electrical equipment. [0004] The present invention solves its technical problem and realizes through the following technical solutions: [0005] ...

AI Technical Summary

Problems solved by technology

In actual use, the disconnection and grounding accidents of power lines will cause the imbalance of three-phase voltage, which will easily cause the burning of three-phase low-voltage electrical equipment, thus threatening the safe operation of low-voltage electrical equipment.