Overview
Features
Available for any voltage and contamination level by changing number of insulators
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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
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)
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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.
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