Name: ZS-770 Pin Post Porcelain Insulator 770mm Creepage
Brand: Pingxiang Risheng Electric Porcelain Co., Ltd.

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ZS-770 Pin Post Porcelain Insulator 770mm Creepage

Product Overview

A long-creepage pin post porcelain insulator with a 770 mm leakage path and a 16 kN rated electromechanical failing load. Electrical margin is high for its class: 190 kV lightning impulse withstand, 110 kV dry and 85 kV wet power frequency withstand, and a 200 kV power frequency breakdown voltage. It is the part to specify where a standard pin insulator keeps flashing over.

Why Buyers Choose This Part

770 mm creepage for severe pollution without going to a longer string
16 kN rated electromechanical failing load
190 kV lightning impulse withstand with a 200 kV breakdown voltage
85 kV wet power frequency withstand for heavy rain and fog

Where It Is Used

Lines crossing industrial zones with conductive airborne fallout
Coastal distribution lines within salt spray range
Line sections with a history of repeated pollution flashover
Compact line designs that cannot accommodate a suspension string

Who It Suits

Line engineers solving recurring flashover on a specific section
Contractors building lines through polluted corridors
Utilities upgrading insulation class without changing the pole design

What Goes Wrong Without The Right Part

Repeat outages on a line section where standard insulators keep failing
Wash programmes that cannot be scheduled often enough to keep up
Insufficient impulse margin on lines with high lightning exposure
Pole designs that leave no room for a longer insulator string

How It Is Built

770 mm creepage distance
16 kN rated electromechanical failing load
190 kV lightning impulse withstand voltage
110 kV power frequency dry withstand voltage
85 kV power frequency wet withstand voltage
200 kV power frequency breakdown voltage

Published Figures For This Product

Every value below comes from the manufacturer data for this item. Figures not listed are confirmed against the drawing before an order is placed.

Creepage Distance	770 mm
Rated Electromechanical Failing Load	16 kN
Lightning Impulse Withstand Voltage	190 kV
Power Frequency Dry Withstand Voltage	110 kV
Power Frequency Wet Withstand Voltage	85 kV
Power Frequency Breakdown Voltage	200 kV

Materials

Electrical porcelain body
Galvanised metal base fitting

Process

Body forming
Glazing
Firing
Base fitting assembly
Electromechanical proof test

Testing

Electromechanical proof loading against the 16 kN rating
Impulse withstand verification at 190 kV
Wet power frequency withstand test at 85 kV

Certification

ISO 9001 quality management system

Customisation Options

Other creepage distances in the ZS pin post family
Base fitting matched to your bracket
Produced to drawing or sample

How It Compares

ZS-600 pin post insulator	ZS-600 gives 600 mm creepage. Move to the ZS-770 when the site pollution class needs the extra 170 mm.
Standard ANSI 55-5 pin insulator	The ZS-770 carries far more creepage and a 16 kN electromechanical rating, so it belongs where standard pin insulators have already proven inadequate.

Before You Order And After It Arrives

Set the creepage requirement from the site pollution class, not from the voltage alone
Keep line pull within the 16 kN electromechanical rating
Inspect the shed undersides, that is where fallout collects first
Wash with clean water when deposits build, avoid abrasive cleaning