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. Please reference NGK catalog No.

2 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. The ability for either style to be connected with other similar insulators is assured by conformance to ANSI standards.

3 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. 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.

4 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. 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.

5 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 sleeves where pin corrosion has been or is expected to be a problem.

6 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. Additionally, the zinc oxidizes without residue, and cannot build up the larger expansion volume in the manner of rusted steel.

7 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., 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.

8 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., 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.

9 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., 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. 97 102 Radio infl uenceVoltage Data CHARACTERISTICS40S360 ANSI CLASS 52-840S290 ANSI CLASS 52-108 STRING FLASHOVER CHARACTERISTICS (Based on ANSI 29-1 Test Procedures) 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 Dry 380 440 495 545 600 650 700 745 795 840 880 925 965 1005 1045 1080 1120 1155 1190 1220 1255 1285 1320 1350 1380 Wet 240 280 320 360 400 440 480 520 560 600 640 680 720 760 805 845 885 925 965 1005 1045 1085 1125 1165 1205 Positive 560 640 720 800 880 960 1040 1120 1200 1280 1360 1440 1520 1600 1680 1760 1835 1915 1995 2075 2155 2235 2315 2395 2475 Negative 575 660 745 825 910 995 1080 1165 1250 1335

10 1420 1505 1590 1675 1760 1845 1925 2010 2095 2180 2265 2350 2435 2520 2605 Dry 425 490 550 610 665 720 775 825 875 920 970 1015 1055 1100 1140 1180 1215 1255 1290 1325 1360 1395 1425 1460 1490 Wet 270 315 365 410 455 500 545 590 635 680 725 770 815 860 905 950 1000 1045 1090 1135 1180 1225 1270 1315 1360 Positive 625 715 805 895 985 1075 1165 1255 1345 1435 1525 1615 1705 1795 1885 1975 2065 2155 2245 2335 2425 2515 2605 2695 2785 Negative 640 735 830 925 1020 1120 1215 1310 1405 1500 1595 1690 1785 1885 1980 2075 2170 2265 2360 2455 2550 2650 2745 2840 2935 Low Frequency Flashover kv Critical Impulse Flashover kvLow Frequency Flashover kv Critical Impulse Flashover kv10 x 5 3/4 10 x 6 1/2 Disc Dia.