一种适用于低压光伏台区塑壳断路器的故障方向判断方法
By adding a current sampling circuit to the molded case circuit breaker in the low-voltage photovoltaic area and combining it with voltage criteria, the problem of insufficient sensitivity of traditional current protection is solved, and high sensitivity and selectivity of fault direction judgment are achieved, simplifying hardware modification and improving the reliability of power supply restoration.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- JIANGSU HOMELITE TECH CO LTD
- Filing Date
- 2022-12-29
- Publication Date
- 2026-07-17
AI Technical Summary
When molded case circuit breakers are widely used in low-voltage photovoltaic areas, traditional three-stage current protection has problems with insufficient sensitivity and selectivity. In particular, the tripping time is too long when there is a fault upstream of the photovoltaic system, which affects the reliability of power supply restoration. At the same time, adding traditional directional elements requires hardware modification and increases the complexity of inverter control.
Two current sampling loops are added to the T-shaped structure of the photovoltaic grid connection point. By using sequence component decomposition and voltage auxiliary criteria, the fault type and direction can be quickly determined. The amplitude comparison method is used to improve sensitivity and selectivity and reduce hardware modification costs.
It achieves highly sensitive fault direction determination, improves the selectivity and reliability of three-stage current protection, simplifies hardware modification, reduces costs, and adapts to the low voltage ride-through characteristics of photovoltaic inverters.
Smart Images
Figure CN116165530B_ABST