Type HS PEXLIM-P Surge Arresters Maximum System Voltage 123 kv to 800 kv
HS PEXLIM-P Metal Oxide Surge Arrester HS PEXLIM-P Surge Arresters are used for the protection of switchgear, transformers and other equipment in high voltage systems against atmospheric and switching overvoltages. For use when requirements of lightning intensity, energy capability are high and pollution level medium, high, and very high. Superior design where low weight, reduced clearances, flexible mounting, and shatter-proof housing is required. Application The HS PEXLIM-P Surge Arrester has been verified to meet Station Class requirements of IEEE C62.11 (IEEE Standard for Metal-Oxide Surge Arresters for AC Power Circuits and Line Discharge Class 4 requirements of IEC 60099-4 (IEC Standard for Metal-Oxide Surge Arresters without gaps for AC Systems. The HS PEXLIM-P Surge Arrester is designed to meet the following performance data: Performance data Maximum system voltages (Vm Duty cycle rated voltages (Vr Classifying current IEEE / ANSI IEC Discharge current withstand strength: High current 4/10 µs Low current 2000 µs 123-800 kv rms 90-624 kv rms 10 / 15 ka peak 20 ka peak 100 ka peak 1500 A peak Energy capability: 2 impulses, (IEC Cl. 7.5.5 13.6 kj/kv of MCOV Fulfills requirements of ANSI transmission-line discharge test for 362 kv systems Short-circuit / Pressure relief capability 80 ka rms sym Mechanical Strength 1 Permissible static service load (PSSL Maximum permissible dynamic service load (MPDSL 14,013 ft-lbs / 19 knm 20,650 ft-lbs / 28 knm Service conditions: Ambient temperature - 50 C to + 45 C Design altitude 6000 ft / 1830 m Frequency 15-62 Hz (1 Higher altitudes designs available on request 2 HS PEXLIM-P Metal Oxide Surge Arresters
Benefits Fiber glass tube construction In special cases with very high demands for mechanical strength, the molded design may not provide the optimal solution particularly at system voltages at 245 kv and higher. Instead, what is required is a mix between the features of the standard EXLIM and the molded POLIM and PEXLIM designs. The HS (High Strength PEXLIM tube design provides this by offering comparable mechanical strength to EXLIM arresters, but with much less weigh. The seismic and pollution performance is in line with the molded POLIM and PEXLIM arresters and thus superior to conventional porcelain designs. Design highlights The basic concept is the replacement of the porcelain housing used with EXLIM arresters by a fiberglass tube housing onto which the silicone sheds are vulcanized. The metal flanges are integrated onto the tube prior to the vulcanizing process. The internal arrangement and the pressure-relief diviese are similar to those for EXLIM arresters. For satisfactory performance, it is important that the units are hermetically sealed for the lifetime of the arresters. The sealing arrangement at each end of the each unit consists of a prestressed stainless steel plate with a rubber gasket against the inner surface of the flanges and ensures effective sealing even if the gasket set due to aging. It also serves to fix the column of blocks in the longitudinal direction by means of heavy spring washers. Nameplates Standard (stainless steel To maintain the interior free of any humidity, the unit is evacuated after the sealing plates and gaskets are fitted and then filled with dry air at low dew point. Additionally, a small bag or a desiccant is placed in each unit during assembly. Sealing is verified for each unit after manufacturing during routine tests. Each arrester is furnished with 4-hole, line and ground terminals for electrical connections. 100% silicone based housing The silicone rubber housing features high tracking and arc resistance, excellent hydrophobic properties, and resistance to weathering, UV radiation and pollution. The incorporation of polymer material in an intermediate class arrester has resulted in many additional advantages. Among these are: Damage resistance Polymer construction reduces possible shipping and handling damage, as well as, damage due to vandalism. Safety Shatter-resistant construction provides greater protection for personnel, as well as, nearby equipment. Drilling plan Master nameplate (SSLT Unit nameplate (SSLT HS PEXLIM-P Metal Oxide Surge Arresters 3
Quick selection guide System Voltage Nominal Surge Arrester ANSI/IEEE Ratings Four-Wire Maximum V m (kv rms Three-Wire V n (kv rms Four-Wire V n (kv rms Three-Wire V r / V MCOV (kv rms Four-Wire Grounded V r / V MCOV (kv rms Grounded High Impedance V r / V MCOV (kv rms Medium Voltage 2.52 2.4 3 / 2.55 4.37Y / 2.52 4.16Y / 2.4 3 / 2.55 5 / 4.25 4.37 4.16 5 / 4.25 5.04 4.8 6 / 5.1 7.24 6.9 9 / 7.65 8.73Y / 5.04 8.32Y / 4.8 6 / 5.1 12 / 10.2 12.6Y / 7.27 12.0Y / 6.93 9 / 7.65 15 / 12.7 13.09Y / 7.56 12.47Y / 7.2 9 / 7.65 18 / 15.3 13.86Y / 8.0 13.2Y / 7.62 10 / 8.4 18 / 15.3 14.49Y / 8.37 13.8Y / 7.97 10 / 8.4 18 / 15.3 14.49 13.8 18 / 15.3 21.82Y / 12.6 20.78Y / 12.0 15 / 12.7 27/ 22 24.0Y / 13.86 22.86Y / 13.2 18 / 15.3 30 / 24.4 24.15 23.0 30 / 24.4 26.19Y / 15.12 24.94Y / 14.4 21 / 17 33 / 27 36.23Y / 20.92 34.5Y / 19.92 27 / 22 42 / 34 36.23 High Voltage 48.30 48 / 39 72.50 60 / 48 123 108 / 88 145 120 / 98 170 144 / 115 245 192 / 152 300 228 /180 362 276 / 220 420 336 / 272 500 420 / 335 Key V n Nominal System Voltage per NEMA C84.1 V m Maximum System Voltage per NEMA C84.1 V r Duty Cycle Rated Voltage per IEEE C62.11 MCOV Maximum Continuous Operating Voltage per IEEE C62.11 TOV SPL LPL FOW Temporary Overvoltage Switching Protective Level 500 A 3-132 V r (kv rms 1000 A 144-240 V r (kv rms 2000 A 258-444 V r (kv rms Lightning Protective Level Front of Wave 4 HS PEXLIM-P Metal Oxide Surge Arresters
Guaranteed performance data Electrical characteristics Ratings (kv rms TOV (kv rms Maximum residual voltage with current wave, (kv peak Voltage MCOV with prior energy single impulse of 8.8 kj/ kv MCOV SPL (SIPL 30/60 µs LPL (LIPL 8/20 µs V r V MCOV 1 sec 10 sec 1.5 ka 3 ka 5 ka 10 ka 20 ka 40 ka 10 ka 90 70 107 102 173 183 191 197 207 228 249 222 94 73 112 107 182 191 200 207 217 239 261 233 96 76 115 109 185 195 204 210 221 243 266 237 102 82 122 116 197 207 217 224 235 259 283 252 108 88 129 123 208 220 230 237 249 274 299 267 114 92 136 130 220 232 242 250 263 289 316 282 120 98 143 137 231 243 254 263 276 304 332 296 129 104 154 147 248 262 274 283 297 327 357 318 132 106 158 150 254 268 280 289 304 334 365 326 138 111 165 157 266 280 293 303 318 350 382 341 144 115 172 164 278 293 306 316 332 365 399 356 150 121 179 171 289 304 318 328 345 379 415 370 162 131 193 184 312 329 344 355 373 410 448 400 168 134 201 191 324 341 357 368 387 425 465 415 172 140 205 196 331 349 365 377 396 435 476 424 180 144 215 205 346 365 381 394 414 455 497 443 192 152 229 218 370 389 407 420 442 486 531 473 198 160 236 225 381 402 420 434 456 501 548 488 210 170 251 239 404 426 445 459 483 531 580 517 216 173 258 246 415 438 458 473 497 546 597 532 222 179 265 253 427 450 471 486 511 562 614 547 228 180 272 259 439 463 484 499 525 577 631 562 258 209 308 294 496 523 547 565 594 653 713 636 264 212 315 300 508 536 560 578 608 668 730 651 276 220 330 314 531 559 585 604 635 698 763 680 288 230 344 328 554 584 610 630 663 728 796 710 294 235 351 335 566 596 623 644 677 744 813 725 300 243 358 341 577 608 635 656 690 758 829 739 312 245 373 355 600 632 661 683 718 789 862 769 330 267 394 376 634 668 699 722 759 834 911 813 336 272 401 382 646 681 712 735 773 849 928 828 342 277 408 389 658 693 725 748 787 865 945 843 360 288 430 410 692 729 762 787 828 910 994 886 396 318 473 451 761 802 839 866 911 1001 1094 975 420 335 501 478 807 851 889 918 966 1061 1160 1034 444 353 530 505 854 900 941 971 1022 1123 1227 1094 588 470 702 669 1130 1191 1245 1286 1353 1486 1624 1448 612 490 731 696 1176 1240 1296 1338 1408 1546 1690 1507 624 499 745 710 1200 1264 1322 1365 1436 1577 1724 1537 FOW 0.5 µs HS PEXLIM-P Metal Oxide Surge Arresters 5
Style numbers and technical data for housings Vertical mounting styles with standard creepage distance Surge Arrester V m (kv IEEE rating Vr / V MCOV (kv Style number Creepage distance inches (mm Strike distance inches (mm Bil 1.2/50 µs dry kv peak Weight (mass lbs (kg A inches (mm B inches (mm C inches (mm D inches (mm Fig 123 90 / 70 P090TV123A 194.9 (4950 1400 750 240 (109 73.54 (1868 1 94 / 73 P094TV123A 194.9 (4950 1400 750 240 (109 73.54 (1868 1 96 / 76 P096TV123A 194.9 (4950 1400 750 240 (109 73.54 (1868 1 102 / 82 P102TV123A 194.9 (4950 1400 750 240 (109 73.54 (1868 1 108 / 88 P108TV123A 194.9 (4950 1400 750 240 (109 73.54 (1868 1 114 / 92 P114TV123A 194.9 (4950 1400 750 240 (109 73.54 (1868 1 120 / 98 P120TV123A 194.9 (4950 1400 750 240 (109 73.54 (1868 1 129 / 104 P129TV123A 194.9 (4950 1400 750 240 (109 73.54 (1868 1 132 / 106 P132TV123A 194.9 (4950 1400 750 240 (109 73.54 (1868 1 138 / 111 P138TV123A 194.9 (4950 1400 750 240 (109 73.54 (1868 1 144 / 115 P144TV123A 194.9 (4950 1400 750 240 (109 73.54 (1868 1 150 / 121 P150TV123A 194.9 (4950 1400 750 240 (109 73.54 (1868 1 145 108 / 88 P108TV145A 194.9 (4950 1400 750 240 (109 73.54 (1868 1 120 / 98 P120TV145A 194.9 (4950 1400 750 240 (109 73.54 (1868 1 132 / 106 P132TV145A 194.9 (4950 1400 750 240 (109 73.54 (1868 1 138 / 111 P138TV145A 194.9 (4950 1400 750 240 (109 73.54 (1868 1 144 / 115 P144TV145A 194.9 (4950 1400 750 240 (109 73.54 (1868 1 150 / 121 P150TV145A 194.9 (4950 1400 750 240 (109 73.54 (1868 1 162 / 131 P162TV145A 194.9 (4950 1400 750 240 (109 73.54 (1868 1 168 / 134 P168TV145A 194.9 (4950 1400 750 240 (109 73.54 (1868 1 170 132 / 106 P132TH170C 194.9 (4950 1400 750 254 (115 73.54 (1868 23.6 (600 11.7 (300 2 144 / 115 P144TH170A 194.9 (4950 1400 750 240 (109 73.54 (1868 1 150 / 121 P150TH170A 194.9 (4950 1400 750 240 (109 73.54 (1868 1 162 / 131 P162TH170A 194.9 (4950 1400 750 240 (109 73.54 (1868 1 168 / 134 P168TH170A 194.9 (4950 1400 750 240 (109 73.54 (1868 1 170 / 140 P172TH170A 194.9 (4950 1400 750 240 (109 73.54 (1868 1 132 / 106 P132TV170C 281.5 (7150 1802 1081 330 (150 94.76 (2407 23.6 (600 11.7 (300 2 144 / 115 P144TV170C 281.5 (7150 1802 1081 330 (150 94.76 (2407 23.6 (600 11.7 (300 2 150 / 121 P150TV170C 281.5 (7150 1802 1081 330 (150 94.76 (2407 23.6 (600 11.7 (300 2 162 / 131 P162TV170A 281.5 (7150 1939 1081 330 (150 94.76 (2407 1 168 / 134 P168TV170A 281.5 (7150 1939 1081 330 (150 94.76 (2407 1 170 / 140 P172TV170A 281.5 (7150 1939 1081 330 (150 94.76 (2407 1 245 180 / 144 P180TM245C 194.9 (4950 1263 750 254 (115 73.54 (1868 23.6 (600 11.7 (300 2 192 / 152 P192TM245C 194.9 (4950 1263 750 254 (115 73.54 (1868 23.6 (600 11.7 (300 2 180 / 144 P180TH245C 281.5 (7150 1602 1081 330 (150 94.76 (2407 31.5 (800 19.7 (500 2 192 / 152 P192TH245C 281.5 (7150 1602 1081 330 (150 94.76 (2407 31.5 (800 19.7 (500 2 198 / 160 P198TH245C 281.5 (7150 1602 1081 330 (150 94.76 (2407 31.5 (800 19.7 (500 2 210 / 170 P210TH245C 281.5 (7150 1802 1081 330 (150 94.76 (2407 23.6 (600 11.7 (300 2 216 / 173 P216TH245C 281.5 (7150 1802 1081 330 (150 94.76 (2407 23.6 (600 11.7 (300 2 222 / 179 P222TH245C 281.5 (7150 1802 1081 330 (150 94.76 (2407 23.6 (600 11.7 (300 2 228 / 180 P228TH245C 281.5 (7150 1802 1081 330 (150 94.76 (2407 23.6 (600 11.7 (300 2 180 / 144 P180TV245C 326.8 (8300 1602 1081 350 (159 94.76 (2407 31.5 (800 19.7 (500 3 192 / 152 P192TV245C 326.8 (8300 1602 1081 350 (159 94.76 (2407 31.5 (800 19.7 (500 3 198 / 160 P198TV245C 326.8 (8300 1602 1081 350 (159 94.76 (2407 31.5 (800 19.7 (500 3 210 / 170 P210TV245C 326.8 (8300 1802 1081 350 (159 94.76 (2407 23.6 (600 11.7 (300 3 216 / 173 P216TV245C 326.8 (8300 1802 1081 350 (159 94.76 (2407 23.6 (600 11.7 (300 3 222 / 179 P222TV245C 326.8 (8300 1802 1081 350 (159 94.76 (2407 23.6 (600 11.7 (300 3 228 / 180 P228TV245C 326.8 (8300 1802 1081 350 (159 94.76 (2407 23.6 (600 11.7 (300 3 6 HS PEXLIM-P Metal Oxide Surge Arresters
Vertical mounting styles with standard creepage distance Surge Arrester Vm (kv IEEE rating V r / V MCOV (kv Style number Creepage distance inches (mm Strike Distance inches (mm Bil 1.2/50 us dry kv peak Weight (Mass lbs (kg A inches (mm B inches (mm C inches (mm D inches (mm Fig 362 258 / 209 P258TM362C 326.8 (8300 1602 1081 350 (159 94.76 (2407 31.5 (800 19.7 (500 3 258 / 209 P258TH362C 389.8 (9900 1963 1500 540 (245 141.5 (3594 63.0 (1600 39.4 (1000 39.4 (1000 4 264 / 212 P264TH362C 389.8 (9900 1963 1500 540 (245 141.5 (3594 63.0 (1600 39.4 (1000 39.4 (1000 4 276 / 220 P276TH362C 389.8 (9900 2163 1500 540 (245 141.5 (3594 47.2 (1200 39.4 (1000 31.5 (800 4 288 / 230 P288TH362C 389.8 (9900 2163 1500 540 (245 141.5 (3594 47.2 (1200 39.4 (1000 31.5 (800 4 294 / 235 P294TH362C 389.8 (9900 2163 1500 540 (245 141.5 (3594 47.2 (1200 39.4 (1000 31.5 (800 4 300 / 243 P300TH362C 389.8 (9900 2163 1500 540 (245 141.5 (3594 47.2 (1200 39.4 (1000 31.5 (800 4 312 / 245 P312TH362C 389.8 (9900 2163 1500 540 (245 141.5 (3594 47.2 (1200 39.4 (1000 31.5 (800 4 258 / 209 P258TV362C 476.4 (12100 2502 1831 595 (270 162.7 (4133 70.9 (1800 39.4 (1000 39.4 (1000 4 264 / 212 P264TV362C 476.4 (12100 2502 1831 595 (270 162.7 (4133 70.9 (1800 39.4 (1000 39.4 (1000 4 276 / 220 P276TV362C 476.4 (12100 2502 1831 595 (270 162.7 (4133 70.9 (1800 39.4 (1000 39.4 (1000 4 288 / 230 P288TV362C 476.4 (12100 2502 1831 595 (270 162.7 (4133 70.9 (1800 39.4 (1000 39.4 (1000 4 294 / 235 P294TV362C 476.4 (12100 2702 1831 595 (270 162.7 (4133 70.9 (1800 39.4 (1000 31.5 (800 4 300 / 243 P300TV362C 476.4 (12100 2702 1831 595 (270 162.7 (4133 70.9 (1800 39.4 (1000 31.5 (800 4 312 / 245 P312TV362C 476.4 (12100 2702 1831 595 (270 162.7 (4133 70.9 (1800 39.4 (1000 31.5 (800 4 420 330 / 267 P330TM420C 389.8 (9900 2163 1500 540 (245 141.5 (3594 47.2 (1200 39.4 (1000 31.5 (800 4 336 / 272 P336TM420C 389.8 (9900 2163 1500 540 (245 141.5 (3594 47.2 (1200 39.4 (1000 31.5 (800 4 342 / 277 P342TM420C 389.8 (9900 2163 1500 540 (245 141.5 (3594 47.2 (1200 39.4 (1000 31.5 (800 4 360 / 288 P360TM420C 389.8 (9900 2163 1500 540 (245 141.5 (3594 47.2 (1200 39.4 (1000 23.6 (600 4 330 / 267 P330TH420C 476.4 (12100 2702 1831 595 (270 162.7 (4133 70.9 (1800 39.4 (1000 31.5 (800 4 336 / 272 P336TH420C 476.4 (12100 2702 1831 595 (270 162.7 (4133 70.9 (1800 39.4 (1000 31.5 (800 4 342 / 277 P342TH420C 476.4 (12100 2702 1831 595 (270 162.7 (4133 70.9 (1800 39.4 (1000 31.5 (800 4 360 / 288 P360TH420C 476.4 (12100 2702 1831 595 (270 162.7 (4133 70.9 (1800 39.4 (1000 31.5 (800 4 330 / 267 P330TV420C 563.0 (14300 3041 2162 694 (315 183.9 (4672 63.0 (1600 39.4 (1000 39.4 (1000 4 336 / 272 P336TV420C 563.0 (14300 3041 2162 694 (315 183.9 (4672 63.0 (1600 39.4 (1000 39.4 (1000 4 342 / 277 P342TV420C 563.0 (14300 3041 2162 694 (315 183.9 (4672 63.0 (1600 39.4 (1000 39.4 (1000 4 360 / 288 P360TV420C 563.0 (14300 3241 2162 694 (315 183.9 (4672 63.0 (1600 39.4 (1000 31.5 (800 4 550 396 / 318 P396TM550C 476.4 (12100 2702 1831 595 (270 170.8 (4339 70.9 (1800 39.4 (1000 31.5 (800 5 420 / 335 P420TM550C 476.4 (12100 2702 1831 595 (270 170.8 (4339 70.9 (1800 39.4 (1000 31.5 (800 5 444 / 353 P444TM550C 476.4 (12100 2702 1831 595 (270 170.8 (4339 70.9 (1800 39.4 (1000 31.5 (800 5 396 / 318 P396TH550C 563.0 (14300 3041 2162 694 (315 192.1 (4878 70.9 (1800 39.4 (1000 39.4 (1000 5 420 / 335 P420TH550C 563.0 (14300 3041 2162 694 (315 192.1 (4878 70.9 (1800 39.4 (1000 39.4 (1000 5 444 / 353 P444TH550C 563.0 (14300 3041 2162 694 (315 192.1 (4878 70.9 (1800 39.4 (1000 39.4 (1000 5 396 / 318 P396TV550C 671.3 (17050 3502 2581 836 (379 238.8 (6065 98.4 (2500 55.1 (1400 55.1 (1400 6 420 / 335 P420TV550C 671.3 (17050 3502 2581 836 (379 238.8 (6065 98.4 (2500 55.1 (1400 55.1 (1400 6 444 / 353 P444TV550C 671.3 (17050 3502 2581 836 (379 238.8 (6065 98.4 (2500 55.1 (1400 55.1 (1400 6 HS PEXLIM-P Metal Oxide Surge Arresters 7
Figures Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 8 HS PEXLIM-P Metal Oxide Surge Arresters
Optional mountings Under-hung mounted styles Available for all ratings. To select, add UH to the end of the style number. Single housing under-hung (Example: 90 kv P090TV070CUH 3 Holes on 10 bolt circle mounting configuration styles Available for all rating To select, add P to the end of the style number. Single housing with adapter plate For 3 holes mounting on 10 bolt circle (Example: 90 kv (P090TV070CP HS PEXLIM-P Metal Oxide Surge Arresters 9
Standard hardware Line terminal Ground terminal Note: Line and ground terminals can accommodate copper or aluminum cable size Number 2 to 1000 MCM / 0.25 to 1.15 in / 6 to 29 mm diameter. Ground terminal can be located on any lug. 10 HS PEXLIM-P Metal Oxide Surge Arresters
Notes HS PEXLIM-P Metal Oxide Surge Arresters 11
Phase-to-ground clearance The phase-to-ground clearance in substations is usually based on the selected standard rated lightning and switching impulse withstand voltages. International standards, e.g. IEC 60071-2, recommend minimum clearances. In general, the clearance between a grounded object and a surge arrester should be the same as the phase-to-ground clearance selected for other high voltage equipment in a substation. If it is not possible to use the normal phase-to-ground clearance in special applications of HS PEXLIM-P Surge Arresters, a smaller clearance may be chosen, considering the protective characteristics of the arrester. At system voltages 24 kv and below, the margin between the rated withstand voltage of the substation and the protective level of the surge arrester is large. Furthermore, distance effects by fast transients do not exist in the immediate vicinity of the surge arrester. The Adjusted Protective Level to be used in Figure 1, is defined as: - For lightning impulse: L pl x 1.15 x e H/8150 - For switching impulse: S pl x 1.10 x e H/8150 H is the altitude in meters above sea level. L pl and S pl are the lightning and switching impulse protective levels for the selected HS PEXLIM-P Surge Arresters at the respective coordinating currents. The minimum clearance is determined either by lightning or switching impulse withstand, whichever renders a larger value. Thus, the recommended minimum phase-to-ground clearance for HS PEXLIM-P Surge Arresters, with regard to lightning and switching overvoltages are presented in Figure 1. These clearances are based on IEC 60071-2, Table VI, and on the protective characteristics of the surge arrester. They include safety margins and altitude correction. (cm 200 Figure 1: Recommended minimum phase-to-ground clearance 150 Switching impulse Lightning impulse 100 50 0 0 100 200 300 400 500 600 700 800 900 1000 Adjusted Protective Level (kv 12 HS PEXLIM-P Metal Oxide Surge Arresters
Phase-to-phase clearance The phase-to-phase clearance for high voltage equipment in a substation is normally based on the selected standard rated lightning and switching impulse phase-to-phase withstand voltages. International standards, e.g. IEC 60071-3 recommend minimum phase-to-phase clearances. Note that the normal election of surge arrester protective levels does not directly protect the phase-to-phase insulation. In general, the clearance between surge arresters in adjacent phases should be the same as the phase-to-phase clearance selected for other high voltage equipment in the substation. If it is not possible to use the normal phase-to-phase clearance in a special application of HS PEXLIM-P Surge Arresters, the minimum clearance with regard to lightning overvoltages can be derived from Figure 2. The clearances shown in Figure 2 are based on the assumption that one phase is subjected to a lightning overvoltage, while the voltage on the adjacent phase is at the peak of the maximum power frequency operating voltage (opposite polarity. Obviously, these clearances will also cover the case of lightning overvoltages of the same polarity appearing simultaneously on two or three phases. The Adjusted Protective Level shown in Figure 2 is based on the lightning protective characteristics of the selected HS PEXLIM-P Surge Arresters. It includes safety margin and altitude correction factors and is defined as: L pl x 1.15 x e H/8150 + V m x 2 / 3 - V m is the highest voltage for equipment according to IEC 60071-1, which is usually equal to the highest system voltage. - L pl is the lightning impulse protective level for the selected HS PEXLIM-P Surge Arrester. The minimum phase-to-phase clearance for arresters with respect to switching overvoltages should always be based on the selected standard rated switching impulse phase-to-phase withstand voltage for the substation. Consequently, the clearances specified in IEC 60071-3, Table VI, are valid for most applications of arresters. If a special application requires a minimized phase spacing, the favorable electrode configuration established by the grading rings on HS PEXLIM-P Surge Arresters may permit a further reduction of the phaseto-phase clearance. Figure 2: Recommended minimum phase-to-phase clearance for lightning overvoltages (cm 250 200 150 100 50 0 0 100 200 300 400 500 600 700 800 900 1000 1100 1200 Adjusted Protective Level (kv HS PEXLIM-P Metal Oxide Surge Arresters 13
Contact us ABB Inc. High Voltage Products - Surge Arresters 100 Distribution Circle Mount Pleasant, Pennsylvania 15666, USA Phone: +1 (724 696-1568 Fax: +1 (724 696-1502 www.abb.us/highvoltage Document Number: 22GNM110061 / August 2013