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Station Post Insulators

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Overview

Station Post Insulators

Insulators are essential to the safe and stable distribution of electricity generated at power plants. The station post (SP) insulators found in power handling equipment at power plants and substations support electric cables and other equipment, isolating them from the ground.
SP insulators support each piece of equipment; several can be connected to form an insulator column.

Features

NGK has been supplying station post insulators with various mechanical rating in accordance with IEC standard or ANSI standard and so on.
In addition to products for HVAC, NGK can supply HVDC post insulators with appropriate shed design for HVDC.

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

Applications

BUS support (Japan)
BUS support (Japan)
Semi-conducting SP (Thailand)
Semi-conducting SP (Thailand)

Test & Standard

NGK station post insulators 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
60168 Test on indoor and outdoor post insulators of ceramic material or glass for systems with normal voltages greater than 1000V
60273 Characteristics of indoor and outdoor post insulators for systems with normal voltages greater than 1000V
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

ANSI Standard

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

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