Huixing Zhongdian provides one-stop comprehensive solutions for power distribution equipment and substation accessories. Medium-voltage equipment (1kV–35kV) acts as a core hub in the power transmission, distribution and consumption chain, featuring five core functions: power transformation, safety control, fault isolation, precise metering and reliable protection.
The core function of medium-voltage transformers is to step down medium-voltage power to low-voltage power, providing safe and reliable electricity for various end users. As a bridge linking medium-voltage distribution networks and low-voltage power sides, it achieves efficient voltage conversion and ensures stable power delivery from the grid to users. It is essential equipment for voltage matching and power distribution in the power system.
Core Function: Automatically detect and clear short-circuit and transient faults; 1 to 4 preset reclosing cycles help isolate permanent faults.
Strengths: Automatically restore power supply after transient faults such as lightning flashovers; vacuum and SF6 arc-extinguishing designs achieve a breaking capacity of up to 40kA; remote parameter configuration is supported.
Application Scenarios: 10–35kV overhead lines, feeder branches, remote distribution networks and PV/wind power grid-connected lines.
Core Function: Offer overcurrent protection and visible isolation, combining the functions of fuses and disconnectors.
Strengths: Simple structure, low cost and easy maintenance; short-circuit breaking capacity ranges from 12.5kA to 16kA; visible disconnection points guarantee on-site safety.
Application Scenarios: Lines of 35kV and below, high-voltage sides of distribution transformers and shunt capacitor bank protection.
Core Function: Create clear and reliable isolation gaps to separate equipment and lines from power sources for maintenance.
Strengths: Achieve full electrical isolation (for no-load operation o
nly without arc-extinguishing capability); mechanical endurance reaches no less than 5,000 operations; manual and electric operation types are available.
Application Scenarios: Substation busbar segmentation, transformer and circuit breaker maintenance, and matching installation for GIS substations.
Core Function: Restrain lightning and switching overvoltages to protect the internal insulation of power equipment.
Strengths: Zinc oxide varistors deliver nanosecond-level response speed; gapless structure ensures a service life of 15 to 20 years; built-in pressure relief devices are adopted.
Application Scenarios: Substations, pad-mounted transformers, ring main units, cable terminals and lightning-prone areas.
Core Function: Provide mechanical support for live conductors and electrical insulation to earth.
Strengths: Combine high mechanical strength (resisting wind, ice and conductor tension) with outstanding insulating performance; porcelain, silicone rubber and composite types are available for diverse working conditions.
Application Scenarios: Overhead transmission lines, substation busbars and internal insulation of switchgears.
Core Function: Realize insulation transition, electric field optimization and sealed connection between cables and power equipment.
Strengths: Stress cone design eliminates electric field concentration; cold-shrink and heat-shrink options are available; superior moisture-proof and chemical corrosion resistance.
Application Scenarios: Underground distribution networ
ks, ring main units, industrial plants and new energy power stations.
Core Function: Convert high voltage and large current into standard 100V, 5A or 1A signals for measurement, metering and system protection.
Strengths: Complete electrical isolation between primary and secondary circuits; accuracy classes reach 0.2S/0.5S for metering and 5P/10P for protection; integrated epoxy casting structure ensures high durability.
Application Scenarios: Substation metering circuits, switchgear protection systems and new energy grid-connected metering.
Core Function: Switch normal load current and
work with fuses to realize short-circuit protection.
Strengths: Three-position design (close-open-earth) simplifies operation; more cost-effective than high-voltage circuit breakers; SF6 and vacuum insulation enable compact installation.
Application Scenarios: Ring main units, cable branch boxes, industrial power supply systems and dual-power switching occasions.
| Application Area | Core Equipment Combination | Key Requirements |
|---|---|---|
| Urban Distribution Grids | Transformers + Reclosers + Load Switches + Surge Arresters + Instrument Transformers | High reliability, fast fault isolation, self-healing capability |
| Industrial Parks | Transformers + Load Switches + Disconnectors + Cable Terminations + Insulators | High capacity, frequent operation, anti-interference |
| Commercial Complexes | Dry-type Transformers + Ring Main Units + Load Switches + Surge Arresters | Fire safety, low noise, compact installation |
| Renewable Energy Stations | Step-up Transformers + Reclosers + Instrument Transformers + Surge Arresters | Grid compatibility, harmonic suppression, remote monitoring |
| Rural Power Grids | Drop-out Fuses + Disconnectors + Surge Arresters + Transformers | Low cost, easy maintenance, extreme environment adaptation |
Medium-voltage distribution equipment serves as the backbone of modern power systems, enabling safe and efficient power supply from substations to end users. Huixing Zhongdian provides a full lineup of medium-voltage distribution products designed for high reliability, intelligent operation and sustainable development.
With the rapid development of smart grids, our solutions are continuously optimized to meet the increasing global demand for efficient, safe and eco-friendly power distribution.
