ZSW-110/6 Post Insulator-Outdoor Rod-Type Porcelain Post Insulator

Product Overview

The ZSW-110kv/6 post insulator is an outdoor rod-type porcelain post insulator, suitable for insulation and support of live parts in 110kV substations and switchgear. With a porcelain solid-core structure, it features high mechanical strength, safe and reliable operation, and an anti-pollution design to meet the requirements of different pollution levels.

Model Description

ZSW-110KV series post insulator model designation: Z - Post Insulator, S - Outdoor, W - Anti-Pollution, Number - Voltage Class (kV) / Bending Strength (kN).

Technical Parameters

Insulator Type: Porcelain Rod-Type Post Insulator

Insulator Model: ZSW-110/6

Voltage Class: 110kV

Bending Strength: 6kN

Creepage Distance: 3050mm

Anti-Pollution Class: Anti-Pollution Type

Power Frequency Dry Withstand Voltage: 300kV

Power Frequency Wet Withstand Voltage: 230kV

Lightning Impulse Withstand Voltage: 550kV

Weight: 76KG

Total Height: 1200mm

Insulator Operating Temperature Range: -40C~+40C, (some products can be used at altitudes up to 4000m)

   The insulator porcelain body is of solid construction. The cementing part uses a body sanding structure. The porcelain formulation has excellent performance and has proven to be highly reliable in actual operation. The sand used for sanding is specially processed granulated sand with strict process control, providing good bonding performance with the porcelain body and a suitable coefficient of expansion, effectively improving the mechanical strength of the product. The flange structure is reasonable, with uniform stress distribution under load. The material is high-strength ductile iron with a hot-dip galvanized surface, offering excellent corrosion resistance. The cement used for cementing is high-grade cement, and with a proper curing process, the strength of the porcelain is fully utilized. All voltage class products are single-column type, featuring simple structure, long service life, and low maintenance requirements. To ensure the reliability of the insulators, each product undergoes individual impact testing, ultrasonic inspection, and four-direction bending withstand load testing.


Model Description



Example 1: zsw2-220/16k-3
Indicates outdoor rod-type post insulator, anti-pollution type, design serial number 2, 220kV voltage class, 16kN bending strength, both upper and lower flanges with plain holes, for Class 3 pollution area.
Example 2: ZSI-110/4L
Indicates outdoor rod-type post insulator, standard type, design serial number 1, 110kV voltage class, 4kN bending strength, both upper and lower flanges with threaded holes, for Class I pollution area

Technical Parameters

1. The insulator has excellent anti-pollution performance:
The anti-pollution capability of post insulators mainly depends on the insulator structure and shed profile. China's power design and research departments have done detailed research work in this area. Through design optimization and artificial and natural pollution tests, an insulator shed profile with alternating large and small sheds and ribs under the sheds was finalized. Insulators developed with this shed profile, with rated voltages of 126kV and 252kV, bending failure load not less than 12kV, and specific creepage distance of 25mm/kV, can withstand long-term operating phase voltage under an equivalent salt deposit density of 0.12mg/cm2, meaning insulators with Class 3 creepage distance can withstand Class 4 equivalent salt deposit density pollution. Insulators with a rated voltage of 550kV and specific creepage distance of 25mm/kV can operate long-term under an equivalent salt deposit density of 0.06mg/cm2. The pollution withstand level of the insulators domestically, the equivalent salt deposit density withstand value is one-third higher than similar products with the same creepage distance and equal-diameter sheds. The artificial pollution withstand voltage test results conducted by the Electric Power Research Institute show that the withstand salt density of insulators with a specific creepage distance of 31mm/kV is 0.25mg/cm2.

2. The insulator has good low-temperature mechanical properties.
To test the low-temperature mechanical properties of the product, freezing tests were conducted on post insulators. After several temperature cycles, bending failure tests were performed on the specimens at low temperatures. The test results proved that the bending failure strength of the insulators at -40C shows no significant change compared to room temperature.

3. The insulator has high mechanical strength, low dispersion, and safe and reliable operation.

Technical Features

ZSW series post insulators have the following technical features:

• Alternating large and small shed design with ribs under the sheds, offering excellent anti-pollution performance
• Porcelain solid-core structure with high mechanical strength and low dispersion
• Good low-temperature mechanical properties, with bending strength showing no significant change at -40C
• Suitable for different pollution levels, with a wide range of creepage distance options