Technology & Processes
With nearly two decades of professional manufacturing experience, we have built deep technical strength and innovation capabilities in high-voltage power components.
Why Shield Rings Are Needed
Electric-field simulation makes the role of shield rings in high-voltage insulation reliability tangible.
Contact Box Electric Field Simulation
Figure 1: Contact box electric field simulation
Figure 1 shows the electric-field simulation of contact boxes used in medium-voltage switchgear. Without a shield ring (top), peak field strength concentrates in the gap between busbar corner and contact box. With a shield ring added at the root of the contact box (bottom), the field across the gap is materially reduced.
Wall Bushing Field Optimization
Figure 2: Wall bushing electric field simulation
Figure 2 shows the wall-bushing simulation. Without shield rings (left), peak field strength accumulates between bushing & mounting plate and between busbar & bushing. Adding a high-voltage and a low-voltage shield ring (right) — tied to HV and ground respectively — drives the field across the air gaps down sharply.
Shield Ring Materials
Multiple material options to match the performance and cost profile of each application.
Stainless Steel (SUS)
Common grades: AISI 201, AISI 304, AISI 316 — AISI 304 is the default. Good corrosion resistance, heat resistance and machinability at a competitive cost; the resulting mesh holds shape well during transport.
Technical Features
- Excellent corrosion resistance
- Good heat resistance and machinability
- High strength and hardness
- Stable during transport
- Excellent cost effectiveness
Brass
Mainly H62 and H65 — each trades off hardness (shape retention) against ductility. Both processing and raw-material costs are higher than stainless. Better ductility means fewer micro-burrs in complex forms, and superior partial-discharge behavior in some operating conditions.
Technical Features
- H62 / H65 specifications
- Excellent ductility
- Fewer burrs in complex forming
- Better partial-discharge performance
- Adapts well to precision machining
Aluminum
Aluminum mesh has the best ductility and the lowest weight, with a thermal-expansion coefficient closer to epoxy than brass or stainless, and good electrical conductivity. The trade-off: it is soft, so insert mounting can deform the original geometry — special pre-treatment is required.
Technical Features
- Best ductility and lightweight
- Thermal expansion close to epoxy
- Good electrical conductivity
- Soft — requires special handling
- Made from 1000-series pure aluminum
Nylon (PA66+30CF)
PA66 reinforced with 30% carbon fiber: an organic polymer with good epoxy affinity; sandblasting further improves resin bonding. The 30% CF content hits the conductive percolation threshold — conductivity sits 10⁶× below metal but is sufficient to control partial discharge. Caveats: higher cost, reduced thermal expansion after CF loading, and crack risk if pre-processing is sloppy.
Technical Features
- PA66 + 30% carbon-fiber polymer
- Good affinity with epoxy resin
- 30% CF — conductive percolation threshold
- Effective partial-discharge control
- Requires precision pre-processing
Mesh Specifications
Three mainstream mesh types, each tuned for a different balance of strength, filtration and formability.
Extended Mesh
Extended Mesh
Made by stretching metal sheet or strip — high filtration rate and good formability. Specifications use internal opening dimensions H×L; shield meshes typically use 2×3 or larger. The trade-off is residual internal stress, which can cause dimensional drift and later deformation.
- Made by stretching metal plate/strip
- High filtration rate and formability
- Spec: internal H×L dimensions
- Common: 2×3 or larger
Perforated Mesh
Perforated Mesh
Punched from metal sheet. Stronger than extended mesh and free of stress-driven deformation, but lower filtration rate. Hole-internal burrs are hard to remove fully, so it sees limited use in high-voltage parts. Specs are stated as hole diameter and pitch.
- Punched from metal sheet
- High strength, no stress deformation
- Lower filtration rate
- Spec: diameter and pitch
Woven Mesh
Woven Mesh
Woven from metal wire. Pros: no burrs, high filtration rate. Cons: weak mesh body that deforms under epoxy casting, compromising insulation distance and partial-discharge behavior. Even after edge finishing, exposed wire ends remain a risk — so use is limited. Specs are mesh count (openings per 25.4 mm).
- Woven from metal wire
- Burr-free, high filtration
- Weaker mesh body
- Spec: mesh count per 25.4 mm
Processing Techniques
A mature mix of precision processing techniques underwriting product quality and performance.
Manufacturing Capabilities
An end-to-end manufacturing system — design through finished product, fully controlled.