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Type HS PEXLIM-P Surge ArrestersMaximum System Voltage 123 kV to 800 kV
2 HS PEXLIM-P Metal Oxide Surge Arresters
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.
ApplicationThe 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 dataMaximum system voltages (Vm) 123 - 800 kV rms
Duty cycle rated voltages (Vr) 90 - 624 kV rms
Classifying current IEEE / ANSI 10 / 15 kA peak IEC 20 kA peak
Discharge current withstand strength: High current 4/10 µs 100 kA peak Low current 2000 µs 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) 14,013 ft-lbs / 19 kNm Maximum permissible dynamic service 20,650 ft-lbs / 28 kNm load (MPDSL) 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
HS PEXLIM-P Metal Oxide Surge Arrester
HS PEXLIM-P Metal Oxide Surge Arresters 3
Benefits
Fiber glass tube constructionIn 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 highlightsThe 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 pre-stressed 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.
NameplatesStandard (stainless steel)
Master nameplate (SSLT) Unit nameplate (SSLT)
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 housingThe 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 resistancePolymer 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
Quick selection guide
4 HS PEXLIM-P Metal Oxide Surge Arresters
KeyV
n Nominal System Voltage per NEMA C84.1
Vm Maximum System Voltage per NEMA C84.1
Vr Duty Cycle Rated Voltage per IEEE C62.11
MCOV Maximum Continuous Operating Voltage per IEEE C62.11
TOV Temporary Overvoltage
SPL Switching Protective Level
500 A 3-132 Vr (kV
rms)
1000 A 144-240 Vr (kV
rms)
2000 A 258-444 Vr (kV
rms)
LPL Lightning Protective Level
FOW Front of Wave
System Voltage Surge Arrester
ANSI/IEEE RatingsNominal
Maximum
Vm
(kVrms)
Three-Wire
Vn
(kVrms)
Four-Wire
Vn
(kVrms)
Three-Wire
Vr / VMCOV
(kVrms)
Four-Wire GroundedVr / VMCOV
(kVrms)
Four-Wire
Grounded High
Impedance
Vr / VMCOV
(kVrms)
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
HS PEXLIM-P Metal Oxide Surge Arresters 5
Guaranteed performance data
Electrical characteristics
Ratings (kVrms) TOV (kVrms) Maximum residual voltage with current wave, (kVpeak)
Voltage MCOV
with prior energysingle impulse of 8.8 kJ/kVMCOV
SPL (SIPL)30/60 µs
LPL (LIPL)8/20 µs
FOW0.5 µs
Vr VMCOV 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
6 HS PEXLIM-P Metal Oxide Surge Arresters
Style numbers and technical data for housings
Vertical mounting styles with standard creepage distance
Vm (kV)
Surge Arrester
IEEE rating
Vr / VMCOV (kV) Style number
Creepage distance
inches (mm)
Strike distance
inches (mm)
Bil 1.2/50 µs
dry kVpeak
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
HS PEXLIM-P Metal Oxide Surge Arresters 7
Vertical mounting styles with standard creepage distance
Vm (kV)
Surge Arrester
IEEE rating
Vr / VMCOV (kV) Style number
Creepage distance
inches (mm)
Strike Distance
inches (mm)
Bil 1.2/50 us
dry kVpeak
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
8 HS PEXLIM-P Metal Oxide Surge Arresters
Figures
Figure 1 Figure 2 Figure 3
Figure 4 Figure 5 Figure 6
HS PEXLIM-P Metal Oxide Surge Arresters 9
Optional mountings
Under-hung mounted stylesAvailable for all ratings. To select, add ‘UH’ to the end of the style number.
(Example: 90 kV P090TV070CUH)
3 Holes on 10” bolt circle mounting configuration stylesAvailable for all rating To select, add P’ to the end of the style number.
(Example: 90 kV (P090TV070CP)
Single housing under-hung
Single housing with adapter plateFor 3 holes mounting on 10” bolt circle
10 HS PEXLIM-P Metal Oxide Surge Arresters
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.
HS PEXLIM-P Metal Oxide Surge Arresters 11
Notes
12 HS PEXLIM-P Metal Oxide Surge Arresters
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.
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.
Phase-to-ground clearance
The Adjusted Protective Level to be used in Figure 1, is defined as:- For lightning impulse: L
pl x 1.15 x eH/8150
- For switching impulse: S
pl x 1.10 x eH/8150
H is the altitude in meters above sea level.
Lpl 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.
Figure 1: Recommended minimum phase-to-ground clearance
Lightning impulse
Switching impulse
0
50
100
150
200
0 100 200 300 400 500 600 700 800 900 1000Adjusted Protective Level (kV)
(cm)
HS PEXLIM-P Metal Oxide Surge Arresters 13
Figure 2: Recommended minimum phase-to-phase clearance for lightning overvoltages
0
50
100
150
200
250
0 100 200 300 400 500 600 700 800 900 1000 1100 1200
Adjusted Protective Level (kV)
(cm)
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.
Phase-to-phase clearance
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 eH/8150 + V
m x √2 / √3
- Vm 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 phase-to-phase clearance.
Contact us
Doc
umen
t N
umb
er:
22
GN
M1
10
06
1 /
Aug
ust
20
13ABB Inc.
High Voltage Products - Surge Arresters100 Distribution Circle Mount Pleasant, Pennsylvania 15666, USA Phone: +1 (724) 696-1568 Fax: +1 (724) 696-1502 www.abb.us/highvoltage
