CATALOG NUMBER 081 BALTIMORE, MARYLAND

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1 CATALOG NUMBER 081 LOCKE SUSPENSION INSULATORS BALTIMORE, MARYLAND

LOCKE SUSPENSION S S N INSULATORS S GUIDE TO SELECTION OF LOCKE SUSPENSION INSULATORS M&E Strength BALL & SOCKET TYPE CLEVIS TYPE Without Zinc Sleeve With Zinc Sleeve Shed Diameter x Spacing Without

3 LOCKE SUSPENSION S S N INSULATORS S GUIDE TO SELECTION OF LOCKE SUSPENSION INSULATORS M&E Strength BALL & SOCKET TYPE CLEVIS TYPE Without Zinc Sleeve With Zinc Sleeve Shed Diameter x Spacing Without Zinc Sleeve Shed Diameter x Spacing (ANSI Class) (ANSI Class) (Leakage Distance) (ANSI Class) (Leakage Distance) 20K 20S840 (52-3) 20S195 (52-3) 10 x 5 3/4 (12 5/8 ) 20S580 (52-4) 10 x 5 3/4 (12 5/8 ) 30K 30S255 (52-5) 30S295 (52-5) 10 x 5 3/4 (12 5/8 ) 30S257 (52-6) 10 x 5 3/4 (12 5/8 ) 40K 40S360 (52-8) 40S370 (52-8) 10 x 5 3/4 (12 13/16 ) 40S290 (52-10) 10 x 6 1/2 (12 13/16 ) 50K --- CA589MZ* (52-11) 11 x 6 1/8 (15 15/16 ) CA589Q* (52-12) 11 x 7 (15 15/16 ) *We offer 50,000 lb M&E insulators under NGK part numbers. Please reference NGK catalog No. 14C. 1

LOCKE INSULATORS, INC. SUSPENSION INSULATORS LOCKE SUSPENSION INSULATORS Today s insulators provide even greater benefits and reliability than in the past.

4 LOCKE INSULATORS, INC. SUSPENSION INSULATORS LOCKE SUSPENSION INSULATORS Today s insulators provide even greater benefits and reliability than in the past. Locke suspension insulators are designed and manufactured to give unparalleled performance and reliability. Silent testimony to this fact is the continuing function of the millions of units already in service. Although shapes and appearances seem unchanging, today s insulators provide even greater benefits and reliability than in the past. Special features and performance capabilities have been added which significantly assist the transmission line designer. CONSTRUCTION DETAILS

5 1. CONNECTIONS 4. PORCELAIN SHELLS Insulators are furnished with either ball-and-socket or clevis-eye configurations. The ability for either style to be connected with other similar insulators is assured by conformance to ANSI standards. Routine checks are made with gages. 2. COTTER KEYS Positive locking of both types is attained by using a humped-type cotter key to prevent unintentional uncoupling during service or handling. The ball-and-socket design has enjoyed a greater popularity over the years because of the overall flexibility and the lack of loose parts. The self-contained split cotter key, by virtue of its hump, can be maintained in either the locked or unlocked position. 3. CAPS & PINS Caps are manufactured of malleable iron or ductile iron. Pins are forged steel. Caps and pins are galvanized per ASTM A153. Proven manufacturing techniques provide the finest quality porcelain to ensure uniformly high mechanical and electrical strength. Each class of insulator has been designed with the unique configurations required to develop the required electrical and mechanical performance. All exposed surfaces are glazed to provide a smooth hard finish, which is easily cleaned of contaminants, and which significantly enhances the mechanical strength. Glaze-bonded sand surfaces on the porcelain provide reliable gripping areas for the cement to develop the full strength of the insulator. 5. ASSEMBLY & TEST Assembly of hardware and porcelain is made with Alumina cement, which has superior characteristics over the Portland cement which is normally used. The cement is steam-cured under controlled conditions to achieve optimum physical properties. Each insulator is mechanically proof-tested at 50% of its M&E rating and is electrically tested prior to shipment. A permanently flexible coating on the inside of the cap and on the pin protects the cap and pin from chemical attack by the cement. The coating also provides more uniform distribution of working stresses in the insulator components. 6. MARKING & COLOR Each porcelain shell is permanently marked to show the manufacturer name, year of manufacture, M&E Strength and Proof-Test Value which has been applied to the insulator. Insulators are available in the following glaze colors: light gray, dark gray, royal blue, and brown. 3

6 LONG TERM STRENGTH Experience shows that Locke suspension insulators maintain their mechanical strength over long periods of time without deterioration. This performance results from using properly engineered materials, good design, and modern manufacturing equipment and technology. We think that it is important to be able to substantiate that our insulators do indeed have long-term strength. We have established an in-house specification to use the IEC Publication 60575, Thermal-Mechanical Performance Test and Mechanical Performance Test on String Insulator Units, as a design test for all Locke suspension insulators. This test consists of simultaneously applying a mechanical cyclical load and a thermal cyclical environment to the insulators. After four cycles, the insulators are subjected to an M&E test. We feel that the M&E results obtained after cyclical stressing of the insulators should be substantially the same as the M&E results obtained without cyclical testing. LOKGARD SLEEVE All Locke ball and socket suspension insulators can be equipped with Lokgard sleeves where pin corrosion has been or is expected to be a problem. Serious pin corrosion can result from electrolytic action with the most severe activity apparently related to areas having high levels of contamination. Corrosion can take place totally outside of the cement which results solely in loss of pin cross-section and hence mechanical strength. Or it can take place inside the cement causing bursting pressure to the porcelain shell with subsequent catastrophic electrical and mechanical failure. The Lokgard sleeve is high purity zinc that is cast on to the insulator pin prior to assembly. It too will corrode in service at approximately the same rate as the steel in the pin, but until the zinc is consumed, no corrosion of the steel can occur. Additionally, the zinc oxidizes without residue, and cannot build up the larger expansion volume in the manner of rusted steel. Therefore, it is impossible for a Lokgard protected insulator porcelain shell to be subjected to corrosion-caused hoop stress damage. A substantial amount of data obtained on a variety of designs by many manufacturers shows a remarkable correlation with extended field performance Designs that perform well on this test have performed very well in service whereas those designs that perform poorly have demonstrated generally unsatisfactory field performance. Contact your local sales representative for design reports covering Long-Term Tests. 4

7 20,000 lb. M & E CHARACTERISTICS Catalog Number 20S840 20S580 Cat. No. w/lokgard Sleeve 20S195 - ANSI Class M&E Rating, lb. 20,000 20,000 Leakage Distance in. 12 5/8 12 5/8 Dry Arcing Distance, in. 7 9/16 7 9/16 Mechanical Impact Strength, in.-lb Tension Proof, lb. 10,000 10,000 Low Frequency Flashover Dry, kv Wet, kv Critical Impulse Flashover Pos., kv Neg., kv Low Frequency Puncture, kv Radio influence Voltage Data Test Voltage, RMS to Ground, kv Max. RIV at 1000 khz, uv Net Weight Each, lb Standard Package Quantity 6 6 Packed Weight, lb S840 ANSI CLASS S580 ANSI CLASS

8 30,000 lb. M & E CHARACTERISTICS Catalog Number 30S255 30S257 Cat. No. w/lokgard Sleeve 30S295 - ANSI Class M&E Rating, lb. 30,000 30,000 Leakage Distance in. 12 5/8 12 5/8 Dry Arcing Distance, in. 7 9/16 7 9/16 Mechanical Impact Strength, in.-lb Tension Proof, lb. 15,000 15,000 Low Frequency Flashover Dry, kv Wet, kv Critical Impulse Flashover Pos., kv Neg., kv Low Frequency Puncture, kv Radio influence Voltage Data Test Voltage, RMS to Ground, kv Max. RIV at 1000 khz, uv Net Weight Each, lb Standard Package Quantity 6 6 Packed Weight, lb S255 ANSI CLASS S257 ANSI CLASS

9 40,000 lb. M & E CHARACTERISTICS Catalog Number 40S360 40S290 Cat. No. w/lokgard Sleeve 40S370 - ANSI Class M&E Rating, lb. 40,000 40,000 Leakage Distance in / /16 Dry Arcing Distance, in. 7 11/ /16 Mechanical Impact Strength, in.-lb Tension Proof, lb. 20,000 20,000 Low Frequency Flashover Dry, kv Wet, kv Critical Impulse Flashover Pos., kv Neg., kv Low Frequency Puncture, kv Radio influence Voltage Data Test Voltage, RMS to Ground, kv Max. RIV at 1000 khz, uv Net Weight Each, lb Standard Package Quantity 6 6 Packed Weight, lb S360 ANSI CLASS S290 ANSI CLASS

10 STRING FLASHOVER CHARACTERISTICS (Based on ANSI 29-1 Test Procedures) Disc Dia. x Spacing Number of Units Dry x 5 3/4 Low Frequency Flashover kv Wet Positive Critical Impulse Flashover kv Negative Dry x 6 1/2 Low Frequency Flashover kv Wet Positive Critical Impulse Flashover kv Negative

12 SALES OFFICES NGK-LOCKE INC. (BALTIMORE OFFICE) 2525 Insulator Drive Baltimore, Maryland 21230, U.S.A. Tel: +1(410) Fax: +1(410) NGK-LOCKE INC. (ATLANTA OFFICE) 1880 West Oak Parkway Suite 104 Marietta, Georgia 30062, U.S.A. Tel: +1(404) Fax: +1(678) NGK-LOCKE INC. (DALLAS OFFICE) 1452 Hughes Road Suite 200 Grapevine, Texas 76051, U.S.A. Tel:+1(817) Fax:+1(817) NGK-LOCKE INC. (LOS ANGELES OFFICE) Hawthorne Blvd., Suite 500 Torrance, California 90503, U.S.A. Tel: +1(310) Fax: +1(310) NGK INSULATORS OF CANADA, LTD. (TORONTO OFFICE) 2700 Matheson Blvd. East, Suite 700 East Tower, Mississauga, Ontario L4W 4V9, Canada Tel: +1(905) Fax: +1(905) NGK INSULATORS OF CANADA, LTD. (MONTREAL OFFICE) 1501, Avenue McGill College, Bureau 515 Montreal (Quebec) H3A 3M8, Canada Tel: +1(514) Fax: +1(514) BALTIMORE, MARYLAND

Polymer Suspension Insulators 69kV to 765kV

CTLOG Polymer Suspension Insulators 69kV to 765kV NGK Locke Polymer Insulators, Inc. Virginia each, Virginia, U.S.. NSI 25kip / SC, SS, SL Shed Series SC Normal ø3.0 (ø76mm) ø3.0 (ø76mm) SS lternating