Standard Type Glass Insulator

Design of insulating part has two external ribs. As a result of ribs arranged on the side face, the surface of insulator is self-cleaned by strong wind. insulators perform well in areas with industrial pollution and salty soil.

Item	Spacing（mm）	Diameter（mm)	Creepage Distance(mm)
U40B	110	175	190
	100	175	190
U70BS	127	255	320
U70BL	146	255	320
U100BL	144	255	320
U100BS	127	255	320
U120B	146	255	320
U120BS	146	280	450
U160BL	170	280	400
	155	280	400
U160BS	146	280	400
U210B	170	280	400
	170	280	450
	170	280	400
	170	280	450
U300B	195	320	485
U400B	205	360	550
U530B	240	380	620
	300	400	700
U70BLP	146	255	400
	146	280	450
	146	320	550
	146	255	400
U100BLP	146	280	450
	146	320	550
	146	255	400
U120BP	146	280	450
	146	320	550
	155	280	450
U160BLP	170	280	450
	170	320	550
	155	320	550
U120BP	170	320	550
	170	320	550
	195	320	550
U120BP	195	360	635
	240	360	635
52-3A	255	146	320
52-5A	255	146	320
52-8A	280	146	400
52-11A	280	155	400
52-4A	255	146	320
52-6A	255	146	320
52-10A	280	165	380
52-3FA	280	146	450
52-5FA	280	146	450
52-8FA	280	171	450
52-11FA	280	170	450

Strength ratings from 40 kN to 550 kN enable application across a wide range of transmission line types, from standard spans to heavy-load structures. The toughened glass disc offers strong resistance to impact and deformation, ensuring stability even under fluctuating mechanical stress. Steel pins and iron caps, bonded by cement and sealed with tar at contact points, enhance mechanical connection and accommodate thermal expansion. This construction reduces the likelihood of fatigue damage over time. Additionally, gaskets help absorb movement between metal and glass interfaces. Customers relying on glass insulators in demanding climates or long-distance installations benefit from reduced breakage rates, long-term material resilience, and consistent insulation performance under both electrical and mechanical stress conditions.

The insulator features zero-value self-breaking, meaning internal damage results in visible breakage, which simplifies inspection without the need for specialized detection equipment. This makes line maintenance more efficient and reduces downtime caused by hidden failures. Furthermore, the relatively small size and light weight allow easier handling during installation and replacement, improving workflow and reducing manual labor burden. The smooth surface structure promotes natural self-cleaning, helping to remove dust, moisture, or industrial pollutants during wind or rain. These advantages are especially valuable for users depending on glass electrical insulators in remote or difficult-to-access areas where inspection intervals are long and consistent performance is essential for grid reliability.

NJREC's toughened glass insulators include a wide array of profile types—such as Fog, Anti-pollution, Out-ribs, and External Shed—that are designed to address different environmental challenges. These profiles vary in rib geometry, creepage distances, and overall diameter to suit polluted, coastal, or high-moisture areas. For example, the Fog type features extended rib structures that lengthen the creepage path, reducing the chance of flashover in high-humidity or salt-laden conditions. Many insulator types provide creepage distances well above standard requirements, further improving resistance to surface leakage. This range of profiles is essential for users selecting green glass insulator units for installations where long-term insulation integrity must be maintained despite the presence of airborne contaminants or harsh weather.

These glass insulators are engineered for reliable operation across a wide voltage spectrum from 10 kV up to 1000 kV. Whether used in medium-voltage rural networks or ultra-high-voltage long-distance corridors, NJREC’s insulators accommodate variations in line span, conductor weight, and structural stress. Available profiles—including Standard, Fog, Open and Double Shed—allow designers to match product type with system load and insulation distance needs. Mechanical strength options up to 550 kN offer flexibility in configuring string lengths or suspension arrangements. For customers needing glass insulators tailored to specific technical standards or geographic requirements, the adaptability across voltage classes makes these insulators a strong option for both grid expansions and infrastructure upgrades.

Installations near coastlines or industrial centers often face persistent exposure to salt spray, dust, chemical residues, or high humidity. NJREC’s fog-type and anti-pollution profiles provide improved environmental resilience by incorporating extended ribs and increased creepage distances. This structural adaptation ensures better self-cleaning during rainfall and decreases surface conductivity caused by contaminants. Even in regions with acidic emissions or dust storms, these insulators help preserve performance and reduce flashover risks. The stable performance of glass electric insulators in such environments contributes to fewer service interruptions, less frequent cleaning cycles, and greater confidence in transmission system resilience. For systems operating in chemically active or moisture-laden settings, specialized profiles provide a meaningful layer of protection.

Transmission lines installed in remote mountains, deserts, or areas with extreme temperature variation require robust components that combine low maintenance needs with high reliability. These toughened glass insulators offer strong arc resistance and visual break detection, both of which are essential when frequent inspection is impractical. Their resistance to thermal cycling, ice buildup, and UV degradation means they maintain function in extreme cold or intense sunlight without surface cracking or loss of dielectric strength. The combination of durable structure and minimal upkeep makes them a dependable choice for grid sections that must operate autonomously for long periods. Users depending on glass insulators in remote terrains benefit from consistent mechanical strength and reduced replacement frequency, which ultimately lowers the total operational burden.

Nanjing Rainbow Electric Co., Ltd. was established in 2005 and has more than twenty years of experience producing insulation components including toughened glass insulators, porcelain insulators, transformer bushings, capacitive bushings and other related insulation materials. The company has specialized plants for glass insulator manufacture, metal fitting accessories, porcelain/composite insulation devices, and raw insulating material supply.

NJREC exports to many regions across the world including North America, South America, Southeast Asia, Africa, Australia and Europe. As glass insulator manufacturers, NJREC ensures its products meet or exceed mechanical strength requirements, offer multiple profiles, maintain accurate spacing, diameter and creepage measurement, zero‑value self‑breaking, arc resistance, and self‑cleaning surfaces. As a producer of glass insulators and green glass insulator types, NJREC supports both new transmission line construction and replacement projects, emphasizing durability, environmental resistance, and reliable insulation integrity.


FAQ

It is composed of toughened glass disc, steel pin, iron cap, cement adhesive; with gasket and tar at contact points to buffer thermal expansion and contraction.

Strength ratings from 40 kN up to 550 kN depending on profile: standard, fog, open, double shed, ground wire etc.

They are suitable for transmission lines with voltage grades from 10 kV to 1000 kV.

Fog profile has extended ribs to block flowing contaminations, open lacks under‑ribs reducing pollutant accumulation, external shed has ribs on side surface assisting self‑cleaning under wind.

They have zero‑value self‑breaking property so that damage produces visible breakage, allowing inspection to see failure without sophisticated instruments.