LLOCKE SUSPENSIONOCKE SUSPENSION …

1 BALTIMORE, MARYLANDCATALOG NUMBER081 LOCKE SUSPENSIONLOCKE SUSPENSIONINSULATORSINSULATORS1 GUIDE TO SELECTION OF LOCKE SUSPENSION INSULATORS BALL & SOCKET TYPE CLEVIS TYPE M&E Without Zinc Sleeve With Zinc Sleeve Shed Diameter x Spacing Without Zinc Sleeve Shed Diameter x Spacing Strength (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.

2 Please reference NGK catalog No. 14C. LOCKE SUSPENSION INSULATORSLOCKE SUSPENSION INSULATORSLOCKE INSULATORS, INC. SUSPENSION INSULATORSL ocke SUSPENSION insulators are designed and manu-factured 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 benefi ts and reliability than in the past. Special features and performance capabilities have been added which signifi cantly assist the transmission line SUSPENSION INSULATORSCONSTRUCTION DETAILST oday s insulators provide even greater benefi ts and reliability than in the CONNECTIONSI nsulators are furnished with either ball-and-socket or clevis-eye confi gurations.

3 The ability for either style to be connected with other similar insulators is assured by conformance to ANSI standards. Routine checks are made with COTTER KEYSP ositive locking of both types is attained by using a humped-type cotter key to prevent unintentional uncou-pling during service or ball-and-socket design has enjoyed a greater popu-larity over the years because of the overall fl exibility 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 CAPS & PINSCaps are manufactured of malleable iron or ductile are forged and pins are galvanized per ASTM permanently fl exible coating on the inside of the cap and on the pin protects the cap and pin from chemical attack by the cement.

4 The coating also provides more uniform distribution of working stresses in the insulator PORCELAIN SHELLSP roven manufacturing techniques provide the fi nest qual-ity porcelain to ensure uniformly high mechanical and electrical class of insulator has been designed with the unique confi gurations required to develop the required electrical and mechanical exposed surfaces are glazed to provide a smooth hard fi nish, which is easily cleaned of contaminants, and which signifi cantly enhances the mechanical sand surfaces on the porcelain provide reliable gripping areas for the cement to develop the full strength of the ASSEMBLY & TESTA ssembly of hardware and porcelain is made with Alumina cement, which has superior characteristics over the Portland cement which is normally used.

5 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. 6. MARKING & COLOREach 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 are available in the following glaze colors: light gray, dark gray, royal blue, and 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.

6 We think that it is important to be able to substantiate that our insulators do indeed have long-term have established an in-house specifi cation to use the IEC Publication 60575, Thermal-Mechanical Perfor-mance Test and Mechanical Performance Test on String Insulator Units , as a design test for all Locke suspen-sion 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 substantial amount of data obtained on a variety of designs by many manufacturers shows a remarkable cor-relation with extended fi eld performance Designs that perform well on this test have performed very well in service whereas those designs that perform poorly have demonstrated generally unsatisfactory fi eld your local sales representative for design reports covering Long-Term SLEEVEAll Locke ball and socket SUSPENSION insulators can be equipped with Lokgard

7 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 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.

8 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 ,000 lb. M & E5 Catalog Number 20S840 20S580 Cat. No. w/LOKGARD Sleeve 20S195 -ANSI Class 52-3 52-4M&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, 100 100 Tension Proof, lb. 10,000 10,000 Low Frequency Flashover Dry, kV 80 80 Wet, kV 50 50 Critical Impulse Flashover Pos.

9 , kV 125 125 Neg., kV 130 130 Low Frequency Puncture, kV 110 110 Test Voltage, 10 10 RMS to Ground, kV Max. RIV 50 50 at 1000 kHz, uV Net Weight Each, lb. Package Quantity 6 6 Packed Weight, lb. 78 82 Radio infl uenceVoltage Data CHARACTERISTICS20S840 ANSI CLASS 52-320S580 ANSI CLASS 52-430,000 lb. M & E6 Catalog Number 30S255 30S257 Cat. No. w/LOKGARD Sleeve 30S295 -ANSI Class 52-5 52-6M&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, 100 100 Tension Proof, lb. 15,000 15,000 Low Frequency Flashover Dry, kV 80 80 Wet, kV 50 50 Critical Impulse Flashover Pos.

10 , kV 125 125 Neg., kV 130 130 Low Frequency Puncture, kV 110 110 Test Voltage, 10 10 RMS to Ground, kV Max. RIV 50 50 at 1000 kHz, uV Net Weight Each, lb. Package Quantity 6 6 Packed Weight, lb. 84 82 Radio infl uenceVoltage Data CHARACTERISTICS30S255 ANSI CLASS 52-530S257 ANSI CLASS 52-640,000 lb. M & E7 Catalog Number 40S360 40S290 Cat. No. w/LOKGARD Sleeve 40S370 -ANSI Class 52-8 52-10M&E Rating, lb. 40,000 40,000 Leakage Distance in. 12 13/16 12 13/16 Dry Arcing Distance, in. 7 11/16 7 11/16 Mechanical Impact Strength, 100 100 Tension Proof, lb. 20,000 20,000 Low Frequency Flashover Dry, kV 80 80 Wet, kV 50 50 Critical Impulse Flashover Pos.