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Ohio Brass Polymer Insulators Components

This library is a compilation of Section 26 of the Ohio Brass January 2002 catalog for Hi*Lite^®XL Transmission Insulators. It contains information for suspension, post, and braced post insulators. This catalog can be downloaded from Hubbell Power Systems' web site at http://www.hubbellpowersystems.com. The direct link to the PDF version of the catalog can is http://www.hubbellpowersystems.com/powertest/catalog_sections/PDF_ohio/26-HiLite.pdf .

The label and stock number used in the component file is the catalog no. used in the OB catalog.

For the ANSI 25kip, ANSI 30kip, ANSI 50kip, and ANSI 80kip suspension and strain insulators, the length, weight, and leakage values were taken straight from the catalog with no additions made for any additional hardware that might be used. These values will need to be adjusted depending on your standard hardware and actual end fittings selected. These values can all be obtained from the OB catalog.

The tension capacity used in the component files for suspension and strain insulators are the Rated Tensile Load (RTL) based upon 2002 NESC Article 277, which requires a 50% reduction of the Specified Mechanical Load (SML). For this reason, your load factors and your strength factors used in PLS-CADD for the insulators should be "1" for the governing NESC conditions. Should you wish to check another loading condition for a capacity other than the 50% reduction, your strength factors in PLS-CADD should be adjusted accordingly.

Suspension and Strain Example;

OB Suspension Insulator 515015-1201 is rated at ANSI 30kips (SML).
The tension capacity used in the component file is the RTL value, or 15000 pounds (50% of 30 kips).
For NESC 250B loading condition, unity (1) should be used for the load factors and strength factors to meet minimum NESC requirements.
Should the user wish to use say 80% of SML for a user specified loading condition, the load factor used should be those normally used, and the strength factor adjusted to 1.6 (80%/50%).

For the post insulators, the horizontal and vertical projections were calculated from the dimensions and inclination angles given in the catalog. The actual position of the wire relative to the centroid of the end of the insulator should be accounted for by either modifying the vertical projection or by chaining a short suspension insulator component to the end of the post when modeling the actual structure to mimic the actual suspension assembly. The weight of the post insulators was also taken directly from the catalog. The projections and weight of the insulators should be modified accordingly should different end fitting and base hardware be used.

Cantilever, tension, and compression capacities were entered for the horizontal post insulators. These capacities are based upon 2002 NESC Article 277, which requires a 40% reduction of the Specified Cantilever Load (SCL) for cantilever and a 50% reduction of the Specified Mechanical Load (SML) for tension and compression. For this reason, your load factors and your strength factors used in PLS-CADD for the insulators should be "1" for the governing NESC conditions. Should you wish to check another loading condition for a capacity other than the 50% and 40% reductions, your strength factors in PLS-CADD should be adjusted accordingly.

Please note that the 40% reduction is different than the Routine Cantilever Load (RCL) published in OB's catalog, as that value is 50% of the SCL.

An important issue to note with post insulators is that combined loadings of compression or tension loading and cantilever loading (i.e. vertical and/or longitudinal loading) can govern the insulator design. Since there are no industry standards available for the calculation of these interaction forces on post insulators, we must rely on the manufacturers' own methods for determining the acceptable combined loadings. For this reason, we have limited the compression capacity of horizontal post insulators to 100 pounds and the RCL for vertical posts. Should your insulators fail in compression, this does not necessarily mean that the insulators will not work, but that you should consult your Hubble Power Systems representative for guidance in the proper application of the combined loading.

Post Example:

OB 2.5" Rod Horizontal Line Post Insulator with a Blade End fitting, Catalog Number 522013-1002, is rated at 1060 pounds Rated Cantilever Load (RCL) and the Maximum Design Tension for a blade end-fitting is 7,500 pounds.
Per OB Design Guide, RCL is 50% of SCL.
The cantilever capacity in the component file is 848 pounds (40% of 2xRCL) and the tension capacity is 7,500 pounds (Maximum Design Tension is %50 of SML).
The compression capacity is 100 pounds.

For the Braced Post insulators, the Maximum Loadings adjusted appropriately per the NESC and those values used for the vertical, transverse, and longitudinal capacities. As the vertical and transverse tend to create tension and compression loads on the insulators, the 50% rule was applied, and thus the values used are the same as those in the catalog. However, the longitudinal load will create cantilever loads on the post insulators, so the 40% rule was used for cantilever loading, similar to the horizontal line posts above. Should you want to use different methods for your calculations, the capacities should be changed accordingly.

Click on Ohio Brass Polymer Insulator Components Library to download the library.

Please see the PLS-POLE or TOWER manuals for a detailed explanation of the various properties. You may also wish to review our technical note Application of NESC Insulator Requirements in PLS-CADD, PLS-POLE and TOWER.

Please note: Power Line Systems cannot provide a copy of Ohio Brass catalog, NESC 2002, or any other standards or material for that matter, as these standards are copyrighted. We suggest that you contact your Hubbell Power Systems Representative or the IEEE for those documents.

LEGAL DISCLAIMER: These files are being provided on an "as-is" basis. Power Line Systems, Inc. accepts no responsibility for the accuracy of the data herein, and the PLS-CADD end user is responsible for the use and verification of all data obtained in this library.