12kV High Voltage Ring Main Unit Fuse Protection Oil-immersed Transformer Current Limiting Fuse Product Introduction

Product Overview

12kV High Voltage Ring Main Unit Fuse Protection Oil-immersed Transformer Current Limiting Fuse is an integrated protection device designed for medium and high voltage power systems, combining the insulation and heat dissipation advantages of oil-immersed transformers with the fast fault isolation capability of current limiting fuses. This product is widely used in urban distribution networks, industrial parks, new energy power stations (such as photovoltaic or hydro-power stations) and other scenarios, aiming to improve the stability and safety of power systems and reduce the risk of equipment damage caused by faults.

Core Structure and Function

1. Oil-immersed TransformerDesign

Oil-immersed transformers use mineral oil as insulation and cooling medium, with excellent heat dissipation performance and overload resistance. The fault protection mechanism inside and outside the oil tank is realized through non-electrical quantity (such as oil temperature, gas pressure) monitoring, combined with electrical quantity protection technologies such as longitudinal differential protection, which can quickly identify internal faults such as winding short circuit and core overheating.

2. Current-limiting fuse protection

Current-limiting fuses use polymer positive temperature coefficient (PPTC) materials or special alloys, which can quickly melt when a short circuit or over-current occurs, limiting the fault current to a safe range. For example, TDK-EPCOS's B59219J0130A020 fuse supports 560V high voltage and has self-recovery characteristics, which is suitable for frequent overload scenarios.

3. High-voltage ring network cabinet integration

The ring network cabinet adopts a modular design, integrating circuit breakers, disconnectors and fuses, and supports a 12kV voltage level. Its protection level reaches IP44, which can resist dust and humid environments and is suitable for outdoor or complex industrial environments. For example, the double terminal design of the MENNEKES additional socket enhances the connection reliability and reduces the energy loss caused by contact resistance.

Technical advantages

- Fast response and high reliability: The current-limiting fuse has an action time of less than 10ms, and with differential protection, it can avoid fault propagation. Infineon's PROFET Load Guard series' adjustable over-current limiting technology (0.3A~8.7A) further optimizes the protection threshold.

- Energy saving and long life: Oil-immersed heat dissipation design reduces temperature rise and extends equipment life; self-resettable fuses reduce maintenance frequency, such as Bourns Multifuse series supports 125℃ high temperature environment, suitable for automotive and industrial fields.

- Intelligent monitoring: Support remote monitoring and parameter adjustment, such as the intelligent load management platform of Deye inverter, which can track current, temperature and other data in real time to achieve fault warning and remote maintenance.

Application scenarios

1. Urban distribution network: used for substations and ring network power supply nodes to ensure the stability of residential and commercial electricity.
2. New energy system: In photovoltaic power stations, transformers boost the medium voltage output of photovoltaic arrays to grid-compatible voltages, and fuses protect inverters and energy storage devices.
3. Industrial power: Provide over-currentprotection for high-load equipment (such as motors and compressors) to avoid production line downtime losses.

Summary

The 12kV high-voltage ring main unit fuse protection oil-immersed transformer current limiting fuse provides an efficient and reliable solution for modern power systems through multiple protection mechanisms and intelligent design. Its technical advantages and wide applicability make it a key equipment in power grid upgrades and new energy transformation.