| Product Overview
Glass insulators are crucial components in power transmission and substation systems, playing a vital role in ensuring electrical insulation and mechanical support. Characterized by their disc-shaped structure, these insulators are typically made of glass material and present a transparent green hue.
Multiple discs are connected in series to form insulator strings, which can be applied in high-voltage transmission towers for supporting and fixing transmission lines, as well as in indoor electrical equipment.
| Product Parameters
| Type | Spacing (mm) | Diameter (mm) | Creepage Distance (mm) | Coupling | Mechanical Failing Load (kN) |
| U40B | 110 | 175 | 190 | 11 | 40 |
| U70BS | 127 | 255 | 320 | 16 | 70 |
| U70BL | 146 | 255 | 320 | 16 | 70 |
| U100BS | 127 | 255 | 320 | 16 | 100 |
| U100BL | 146 | 255 | 320 | 16 | 100 |
| U120B | 146 | 255 | 320 | 16 | 120 |
| U120BS | 127 | 255 | 320 | 16 | 120 |
| U160BL | 170 | 280 | 400 | 20 | 160 |
| U160BS | 146 | 280 | 400 | 20 | 160 |
| U210B | 170 | 280 | 400 | 20 | 210 |
| U240B | 170 | 280 | 400 | 24 | 240 |
| U300B | 195 | 330 | 490 | 24 | 300 |
| U400B | 205 | 360 | 550 | 28 | 420 |
| U550B | 240 | 380 | 620 | 32 | 550 |
| U70BLP | 146 | 280 | 450 | 16 | 70 |
| U100BLP | 146 | 280 | 450 | 16 | 100 |
| U120BP | 146 | 280 | 450 | 16 | 120 |
| U160BLP | 170 | 320 | 550 | 20 | 160 |
| U160BMP | 155 | 320 | 550 | 20 | 160 |
| U160BSP | 146 | 320 | 550 | 20 | 160 |
| U210BP | 170 | 320 | 550 | 20 | 210 |
| U240BP | 170 | 320 | 550 | 24 | 240 |
| U300BP | 195 | 380 | 690 | 24 | 300 |
| U420BP | 205 | 380 | 620 | 28 | 420 |
| U550BP | 240 | 390 | 710 | 32 | 550 |
| Application and Maintenance
Application
Glass insulators are widely used in high-voltage transmission towers to support and fix transmission lines, providing both electrical insulation and mechanical fixation. They are also applicable in indoor electrical equipment setups.
In special scenarios such as ultra-high-voltage transmission lines, their ability to withstand high voltage and mechanical stress can be fully utilized.
Maintenance
Regular inspections by electric power workers are necessary. This includes checking for signs of damage, such as cracks or reduced mechanical integrity.
In case of self-bursting of glass insulators, a unique feature where the residual strength can still support the conductor temporarily, timely replacement is required to ensure the long-term stable operation of the power system.
Compared to some competitive products, the maintenance cycle and difficulty may vary. Due to the self-bursting feature, damage to glass insulators is more easily detectable, which can simplify the maintenance process to some extent.
| Competitive Products Comparison
Competitive insulators in the market also target power system applications. Similar products may differ in material, design, and performance under specific operating conditions.
Material Variations
Some competing products use ceramic materials instead of glass. Ceramic insulators have good chemical stability but may be heavier and more brittle compared with glass insulators.
Glass insulators offer advantages such as higher mechanical strength. Even when self-bursting occurs, the residual strength can still support the conductor, helping to avoid transmission line breakage and dropping.
Design Differences
Competitors' products may have different disc shapes or string configurations. For example, some may use more complex contour designs to optimize electric field distribution, while the simple and efficient disc-series structure of glass insulators has been proven effective in long-term operation.
In terms of mechanical design, some competitive insulators may have lower mechanical failing loads, which restricts their application in high-load power transmission scenarios.
Performance in Specific Scenarios
In extreme weather conditions such as heavy pollution or strong wind, different insulators show distinct performance. Some competitive products may require more frequent maintenance in polluted environments due to lower creepage distance design or material properties.
Glass insulators with an appropriate creepage distance can maintain good insulation performance with relatively less maintenance.
| Key Features
RTV coating protection: The RTV coated surface helps improve pollution resistance and supports stable insulation performance in harsh outdoor environments.
High mechanical strength: The U210BP model offers a mechanical failing load of 210kN, making it suitable for high-load overhead transmission line applications.
Long creepage distance: The 550mm creepage distance helps reduce the risk of flashover in polluted, humid, or salt-fog environments.
Toughened glass core: The glass insulator body provides reliable insulation, mechanical stability, and convenient visual inspection during maintenance.
Ball-and-socket connection: The coupling design supports secure installation and easy assembly into suspension insulator strings.
Outdoor durability: Suitable for long-term exposure to rain, wind, sunlight, dust, temperature changes, and industrial pollution.
| Why Choose RTV Coated Glass Insulators?
In areas with heavy pollution, salt fog, dust, or high humidity, conventional insulator surfaces may accumulate contaminants over time, increasing the risk of leakage current and flashover. RTV coated glass insulators are designed to provide enhanced surface protection, making them suitable for difficult operating conditions where reliable insulation is essential.
Compared with ordinary glass insulators, RTV coated glass insulators offer better adaptability in coastal areas, chemical industrial zones, mining areas, desert regions, and other environments where pollution or moisture may affect power line safety. The coating helps reduce surface contamination impact and supports stable power system operation.
| Selection Guide
When selecting RTV coated glass insulators, customers should consider voltage level, mechanical failing load, creepage distance, coupling size, pollution level, installation environment, and line design requirements. For power line projects in heavily polluted or coastal areas, RTV coated models are often preferred because they provide additional surface protection compared with ordinary glass insulators.
For the U210BP model, the 210kN mechanical failing load makes it suitable for transmission line systems where stronger mechanical performance is required. If the project is located in a high-pollution zone, it is also important to confirm the creepage distance and coating requirements before final model selection.
| Quality Control and Testing
NJREC focuses on product quality, dimensional consistency, mechanical strength, coating performance, and electrical insulation reliability. Each RTV coated glass insulator is manufactured for use in power transmission and distribution projects where safety and long-term stability are essential.
According to customer or project requirements, inspection can include appearance checking, dimensional verification, mechanical performance testing, electrical performance testing, and coating surface inspection. Related test reports and technical documents can be provided when required.
| Installation and Maintenance Notes
Check the glass body, RTV coated surface, and metal fittings before installation.
Confirm that the coupling size and accessories match the project drawings and line hardware.
Avoid scratching or damaging the RTV coating during transportation, handling, and installation.
Install the insulator string according to power line construction requirements and engineering standards.
Carry out regular inspections after storms, lightning, strong wind, or heavy pollution events.
Replace damaged insulator units in time to ensure safe and stable operation of the transmission line.
For polluted environments, check the coating condition and surface contamination during routine maintenance.
| Why Choose NJREC U210BP RTV Coated Glass Insulator?
NJREC provides glass insulators, RTV coated glass insulators, transformer bushings, and related insulation products for transmission line and substation applications. The U210BP RTV Coated Glass Insulator is suitable for customers who need strong mechanical performance, improved pollution resistance, and reliable insulation for demanding power line projects.
With experience in power transmission, substation insulation, and transformer bushing products, NJREC can support customers with product selection, technical communication, packing solutions, and project documentation according to different market and engineering requirements.
