[PDF] Worksheets On Conductors And Insulators worksheets on ...

01 Sep.,2025

 

[PDF] Worksheets On Conductors And Insulators worksheets on ...


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Suspension Insulators | Products | NGK INSULATORS, LTD.

Overview

Features

Available for any voltage and contamination level by changing number of insulators

Product Lineup

Various Types of Suspension (Disc) Insulators.

Application

High Reliability

High reliability is achieved by long-term experience and accumulation of technology.

Selected High Quality Raw Material

High strength porcelain insulators require not only higher amount of alumina but also

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Optimum Design Engineering

  • *M&E Test: Electromechanical failing load test as per IEC -1

Advanced Manufacturing Technology

Strict Quality Control

In addition to ISO certified,

Hydraulic Pressure Test

Excellent Long-Term Performance

Long-Term Performance Evaluation

Thermal-Mechanical (T&M) performance test as per IEC -1 or ANSI C29.2 is to evaluate long-term reliability of insulators.
As these standards specify minimum requirements only, all NGK insulators have been confirmed to pass modified T&M test.

Test Method IEC Pub. -1 NGK Method Load 60-65% of Specified
E&M failing load
(24-hour cycle) 60-65% of Specified
E&M failing load
(1-hour cycle) Temperature -30°C to +40°C
(24-hour cycle) -40°C to +60°C
(8-hour cycle) Duration 4days 15days

Acceptance Criteria for T&M Test

To exclude poor quality insulators, M&E test results before and after T&M test are:

(R: mean value, s: standard deviation)

Zinc Sleeve

Contaminated and wet insulators display a biased leakage current having DC component. This DC component causes electrolytic corrosion and reduction of pin diameter.

Pin Corrosion of suspension (disc) insulator

NGK developed Zinc Sleeve to prevent pin corrosion.

Test & Standard

NGK suspension (disc) insulators meet the requirements and tests of the following standards.

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IEC Standard and Technical Report

-1 High-voltage test techniques, Part 1: General definitions and test requirements Dimensions of ball and socket coupling of string insulator units Characteristics of insulator units of the cap and pin type -1 Insulator units - Definitions, test methods and acceptance criteria -2 Insulator strings - Definitions, test methods and acceptance criteria Radio interference test on high-voltage insulators Dimensions of clevis and tongue coupling of string insulator units Artificial pollution tests on high-voltage insulators to be used on a.c. systems Thermal-mechanical performance test Residual strength of string insulator units Guide for the selection of insulators in respect of polluted conditions Puncture testing Artificial pollution tests on high-voltage insulators to be used on d.c. systems Insulator units for d.c. systems - Definitions, test methods and acceptance criteria

ANSI Standard

C29.1 Electrical power insulators - test methods C29.2 Wet-process porcelain and toughened glass - suspension type

CAN/CSA Standard

C411.1 AC suspension insulators

EHV & UHV Service Experiences