Porcelain Insulators

Hollow Insulators

Introduction

Introduction

NGK has been supplying various kind of hollow insulators for apparatus, such as Power Transformer, Gas Circuit Breaker, Current & Voltage Transformer and so on, up to 1000kV. These insulators are designed in accordance with customer's requireme

  • NGK has developed a shed profile having longer leakage distance to improve contamination in the 1980s and has established an ultralarge 12-meter hollow insulator that will be used in 1000kV power transmission systems.

Shed design

Contamination performance of station insulators is influenced by the kind and degree of contamination.
It is also largely influenced by the shed shape, especially for the application of DC systems.

Based upon accumulated laboratory test data and field experiences regarding efficiency of leakage distance of various shed shapes for AC & DC systems, NGK has established the following standard shed shapes.

Plain shed

Plain shed

Single rib shed

Single rib shed

Double rib shed

Double rib shed

Alternating shed

Alternating shed

Super deep rib shed

Super deep rib shed
(This shed shape is
used mainly for DC use)

Super deep rib shed

DC fog withstand voltage characteristics of station insulators with various shed shapes

Applications

500kV GIS

500kV GIS

1000kV GIS

1000kV GIS

Test & Standard

NGK hollow insulators for apparatus can meet the requirements and tests specified in the following standards.

IEC Standards and Technical Report

60060-1 High-voltage test techniques Part1: General definitions and test requirements
60233 Tests on hollow insulators for use in electrical equipment
60437 Radio interference test on high-voltage insulators
60507 Artificial pollution tests on high-voltage insulators to be used on AC systems
60815 Guide for the selection of insulators in respect of polluted conditions
61245 Artificial pollution tests on high-voltage insulators to be used on D.C. systems
61264 Ceramic pressurized hollow insulators for high-voltage switchgear and controlgear

ANSI Standard

C29.1 Electrical Power Insulators - Test methods
C29.9 Wet-Process Porcelain insulators - Apparatus, Post-type

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