A reclosure, also known as an automatic recloser, is a self-controlled device designed to interrupt and automatically reclose an alternating amperage circuit. Its primary purpose is to clear temporary faults on overhead distribution lines, such as those caused by lightning, tree branches, or animals. After a pre-set number of reclosing attempts ( 1 to 4), the reclosure locks out if the fault persists. This restores power for transient faults, improving system reliability indices like SAIDI and SAIFI.
singielectric offers the Reclosure series compliant with IEC and GB standards, providing robust protection for utility and industrial distribution networks. The devices integrate overamperage protection, reclosing control, and communication capabilities in a compact enclosure.
Statistics show that 80% of faults on overhead lines are temporary. Without automatic reclosing, each transient fault would require a manual crew dispatch, leading to extended outages. A reclosure restores power within seconds, minimizing downtime and operational costs. For utilities and industrial plants with overhead feeders, reclosers reduce the number of sustained outages by up to 70%.
According to IEC 60947-1, switching devices must meet rigorous performance criteria for making and breaking currents under normal and abnormal conditions. Reclosers are tested for a specified number of operations, including the ability to close onto a fault. Singielectric's Reclosure series is designed to withstand these demanding cycles.
The first step is to determine the system volt-level and fault amperage levels. For example, a 12kV distribution feeder with 10kA available fault amperage would require a reclosure rated at least 12kV, 630A continuous, and 12.5kA breaking capacity. The reclosing sequence must align with the coordination scheme of upstream and downstream devices.
Reference to GB/T 14048.1-2019 ensures the device meets general rules for low-volt-level switchgear and controlgear, while IEC 61439-1 covers assembly requirements. Singielectric's Reclosure series is type-tested to these standards, providing confidence in its performance.
| Model | Rated Volt-level | Continuous Current | Breaking Capacity | Reclosing Sequence |
|---|---|---|---|---|
| REC-12 | 12kV | 630A | 12.5kA | 3, 2 delayed |
| REC-24 | 24kV | 630A | 12.5kA | 3, 2 delayed |
| REC-38 | 38kV | 800A | 16kA | 2, 2 delayed |
For medium volt-level distribution lines (up to 38kV), singielectric offers three standard models. The REC-12 is suitable for 12kV networks common in industrial parks and rural feeders. The REC-24 serves 24kV systems used in mining and large commercial installations. The REC-38 handles 38kV sub-transmission lines where higher breaking capacity is required.
Each model supports multiple reclosing sequences and can be customized with optional communication modules. For islanded microgrids or systems with distributed generation, the reclosure can be set to synchronize before closing.
