KHT Fuses, LLC A Hi-Tech Fuses Company Trans-Guard FX Full-Range Current-Limiting Fuses General: The Trans-Guard FX full-range current-limiting fuse provides both overload and fault current protection for distribution equipment in a single fuse body. As a full-range fuse, it is capable of interrupting any continuous current between the minimum current that can cause melting of its elements and its rated maximum interrupting current (50,000 amps). The fuses are capable of interrupting in elevated ambient temperatures up to their rated maximum application temperature, which is 140 C and 71 C for the 2.2 inch and 3.3 inch diameter designs, respectively. The Trans-Guard FX fuse is hermetically sealed and thus discharges no gasses during fuse operation. An additional design distinction is its patented Damage Sensor that significantly reduces the potential for fuse failure in the event of element damaging current surges. Trans-Guard FX Full-Range Current-Limiting Fuse Line Applications: Trans-Guard FX fuses are available in a broad range of ratings. For ease of application, all designs are compatible with the industry-recognized standard mounting codes. Common applications include the Trans-Guard FX: q q q q q installed in dry-well canisters for distribution transformer protection (see Figure 1) clip mounted in live-front switchgear (see Figure 2) externally mounted on overhead distribution systems (outdoor version) encapsulated in rubber housings for installation in underground vaults installed in "wet-well" fuseholders for oil-filled padmounted switchgear (special "SFX" version) Design Features: Figure 1 Figure 2 O Patented Damage Sensor designed to significantly reduce the risk of fuse failure should the fuse be subjected to an element damaging current surge. O Hermetically sealed construction ensures that no gasses escape from the fuse during current interruption. All Trans-Guard FX fuses are helium mass spectrometer leak tested to ensure sealing system integrity. O Optional blown fuse indicator provides reliable indication of fuse operation without adversely affecting the fuse's arcing performance due to its unique design. O Versatile design - With its hermetically sealed construction and resin-rich body surface, the same fuse can be used for both in-air and under-oil applications. O Rugged cast bronze end caps used for greater ferrule strength resulting in less distortion and more secure fuse attachment in dry-well canisters. O Tested in accordance with the most recent ANSI/IEEE standards, which include requirements for short circuit testing at the manufacturer's specified rated maximum application temperature (140 C and 71 C for 2.2 inch and 3.3 inch diameter Trans-Guard FX designs, respectively). January 2001 * Supersedes June 1997 * 2001 Hi-Tech Fuses, Inc. 1 Trans-Guard FX Full-Range Current-Limiting Fuses Construction: Low current interruption element (includes patented damage sensor) Tin plated bronze caps Mica element support High current interruption element "B" 0.625 (15.9) "C" Length "A" Optional blown fuse indicator Resin-rich filament wound glass/epoxy body Compacted quartz sand Welded element joints Epoxy Joint Soldered electrical connection and sealing Table 1 - Trans-Guard FX Fuse Dimensional Information Voltage Current (kV) (amp) 5.5 Standard Mounting Code A B C 80-200 17.51-17.35 (444.8-440.7) 1.21-1.17 (30.7-29.7) 3.32-3.25 (84.4-82.5) 6 3-50 10.00-9.86 (254.0-250.4) 1.02-.98 (25.9-24.9) 2.25-2.18 (57.0-55.3) 4 65-125 14.7-14.54 (373.4-369.3) 1.21-1.17 (30.7-29.7) 3.32-3.25 (84.4-82.5) 5 3-50 14.31-14.17 (363.5-359.9) 1.02-.98 (25.9-24.9) 2.25-2.18 (57.0-55.3) 5 65-100 17.51-17.35 (444.8-440.7) 1.21-1.17 (30.7-29.7) 3.32-3.25 (84.4-82.5) 6 6-50 17.12-16.98 (434.8-431.3) 1.02-.98 (25.9-24.9) 2.25-2.18 (57.0-55.3) 6 8.3 15.5 23.0 Dimensions inches (mm) January 2001 * Supersedes June 1997 * 2001 Hi-Tech Fuses, Inc. 2 Trans-Guard FX Full-Range Current-Limiting Fuses Electrical Characteristics: Table 2a - Electrical Characteristics of Trans-Guard FX Fuses (Single Fuses) NOMINAL VOLTAGE RATING CURRENT RATING (kV) (A) 5.5 5.5 5.5 5.5 5.5 8.3 8.3 8.3 8.3 8.3 8.3 8.3 8.3 8.3 8.3 8.3 8.3 8.3 8.3 8.3 15.5 15.5 15.5 15.5 15.5 15.5 15.5 15.5 15.5 15.5 15.5 15.5 15.5 15.5 23.0 23.0 23.0 23.0 23.0 23.0 23.0 23.0 23.0 23.0 80 100 125 150 200 3 6 8 10 12 18 20 25 30 40 50 65 80 100 125 3 6 8 10 12 18 20 25 30 40 50 65 80 100 6 8 10 12 18 20 25 30 40 50 FUSE MODEL NUMBER RATED MAXIMUM VOLTAGE (kV) HTFX320080 HTFX320100 HTFX320125 HTFX320150 HTFX320200 HTFX230003 HTFX230006 HTFX230008 HTFX230010 HTFX230012 HTFX230018 HTFX230020 HTFX230025 HTFX230030 HTFX230040 HTFX230050 HTFX330065 HTFX330080 HTFX330100 HTFX330125 HTFX240003 HTFX240006 HTFX240008 HTFX240010 HTFX240012 HTFX240018 HTFX240020 HTFX240025 HTFX240030 HTFX240040 HTFX240050 HTFX340065 HTFX340080 HTFX340100 HTFX250006 HTFX250008 HTFX250010 HTFX250012 HTFX250018 HTFX250020 HTFX250025 HTFX250030 HTFX250040 HTFX250050 5.5 5.5 5.5 5.5 5.5 10.0 10.0 10.0 10.0 10.0 10.0 10.0 10.0 10.0 10.0 10.0 8.3 8.3 8.3 8.3 17.2 17.2 17.2 17.2 17.2 17.2 17.2 17.2 17.2 17.2 17.2 15.5 15.5 15.5 23.0 23.0 23.0 23.0 23.0 23.0 23.0 23.0 23.0 23.0 MAXIMUM CONTINUOUS CURRENT (IN AIR) (6) 25O C 99 126 142 184 208 5.0 11.0 13.5 16.0 20.5 23.5 27.5 37.0 41.0 50.0 57.0 81.0 95.0 120.0 135.0 5.0 11.0 13.5 16.0 20.5 23.5 27.5 37.0 41.0 50.0 53.0 78.0 88.0 114.0 11.0 13.5 16.0 20.5 23.5 27.5 37.0 41.0 48.0 55.0 40O C 96 122 138 178 202 4.9 10.5 13.0 15.5 19.5 22.5 26.5 35.5 39.5 48.5 55.0 79.0 92.0 117.0 131.0 4.9 10.5 13.0 15.5 19.5 22.5 26.5 35.5 39.5 48.5 51.5 75.0 85.0 110.0 10.5 13.0 15.5 19.5 22.5 26.5 35.5 39.5 46.5 53.0 January 2001 * Supersedes June 1997 * 2001 Hi-Tech Fuses, Inc. 55O C 94 118 134 173 196 4.7 10.0 12.5 15.0 19.0 22.0 25.5 34.5 38.5 47.0 53.5 77.0 89.0 113.0 127.0 4.7 10.0 12.5 15.0 19.0 22.0 25.5 34.5 38.5 47.0 50.0 73.0 82.0 107.0 10.0 12.5 15.0 19.0 22.0 25.5 34.5 38.5 45.0 51.5 PEAK ARC VOLTAGE (kV) MINIMUM MELT I2t MAXIMUM TOTAL I2t (3) (4) (5) (AMP2 SEC) (AMP2 SEC) 15.0 15.0 15.0 15.0 15.0 30 32 28 28 26 26 26 26 26 26 26 25 25 25 25 51 54 46 46 43 45 45 45 45 45 45 40 40 40 67 61 61 60 60 60 60 60 60 60 22,100 56,700 78,300 176,000 259,000 100 620 800 800 920 1,310 1,620 3,660 5,250 8,700 12,800 25,200 47,200 78,300 115,150 100 620 800 800 920 1,310 1,620 3,660 5,250 8,700 12,800 25,200 39,400 80,000 620 800 800 920 1,310 1,620 3,660 5,250 8,700 12,800 110,000 280,000 380,000 860,000 1,270,000 350 2,700 4,000 4,000 8,000 9,500 11,000 22,000 30,000 50,000 70,000 100,000 185,000 330,000 480,000 510 2,600 3,700 3,700 6,500 8,000 10,000 22,000 30,000 50,000 70,000 110,000 185,000 380,000 3,100 4,800 4,800 8,300 11,200 13,000 28,000 38,000 61,000 82,000 3 Trans-Guard FX Full-Range Current-Limiting Fuses Table 2b - Electrical Characteristics of Trans-Guard FX Fuses (Parallel Fuses) NOMINAL VOLTAGE RATING CURRENT FUSE RATING MODEL NUMBER (A) (Order Two fuses) RATED MAXIMUM VOLTAGE MAXIMUM CONTINUOUS CURRENT (IN AIR) (6) PEAK ARC VOLTAGE (kV) MINIMUM MELT I2t MAXIMUM TOTAL I2t (3) (4) (kV) 25O C 40O C 55O C (5) HTFX230030 10.0 80.0 77.0 75.0 26 21,000 120,000 80 HTFX230040 10.0 98.0 95.0 92.0 26 34,000 180,000 8.3 100 HTFX230050 8.3 111.0 108.0 105.0 24 51,200 250,000 8.3 130 HTFX330065 8.3 158.0 154.0 151.0 24 100,800 400,000 8.3 160 HTFX330080 8.3 186.0 180.0 175.0 24 189,000 740,000 8.3 200 HTFX330100 8.3 235.0 229.0 221.0 24 313,000 1,300,000 8.3 250 HTFX330125 8.3 265.0 256.0 249.0 24 460,500 1,800,000 15.5 60 HTFX240030 17.2 80.0 77.0 75.0 45 21,000 110,000 15.5 80 HTFX240040 17.2 98.0 95.0 92.0 45 34,800 170,000 15.5 100 HTFX240050 17.2 104.0 101.0 98.0 45 51,200 310,000 15.5 130 HTFX340065 15.5 152.0 147.0 143.0 39 100,800 440,000 15.5 160 HTFX340080 15.5 172.0 167.0 160.0 39 157,500 740,000 15.5 200 HTFX340100 15.5 222.0 214.0 208.0 39 320,000 1,520,000 (kV) (2) 8.3 60 8.3 (AMP2 SEC) (AMP2 SEC) Notes to Table 2a and 2b: 1. Designs have a 50,000 Amps rms. Symmetrical Rating (except 3A 17.2 kV which was tested at 44 kA maximum). 2. Current ratings shown in Table 2b are achieved by using a parallel combination of two fuses (order two fuses). To facilitate equal sharing of the interrupting duty, the two fuses should be resistance matched ( 2%) and be mounted such that the current paths to and from each fuse are symmetrical. 3. Tabulated Maximum Total I2t values are for currents of 50,000 amperes at the nominal voltage of the fuse. Fuses that have a Rated Maximum Voltage higher than their Nominal Voltage Rating will have a higher I2t letthrough when applied at voltages up to these higher values. For example, Maximum Total I2t values are increased by approximately 30% when 8.3 kV fuses are applied at 10 kV and approximately 25% when 15.5 kV fuses are used at 17.2 kV. 4. Maximum total I2t values are reduced for currents below 50,000 A. For example, at 10,000 A, maximum total I2t values are approximately 15% less than the published values. 5. Peak arc voltages quoted are for 50,000 A currents at the rated maximum voltage listed. Reduced currents and voltages will reduce the peak arc voltage. Consult the factory for further information. 6. Maximum continuous currents at higher ambient temperatures, and in confining enclosures: * These may be determined by derating the fuses by 0.2% per degree C over 25O C (for example at 85O C the derating would be 60 x .2 = 12%, making the maximum continuous current of a 30 A fuse 41 x .88 = 36.1 A). * When fuses are applied in a confining enclosure, such as a dry-well canister, additional derating of a fuse's maximum continuous current is necessary. Specifically, the maximum continuous current for fuses used in a dry-well canister, with the canister completely submerged in oil, will be reduced by an additional 2%. When calculating the derating for temperature, as described above, the temperature of the oil surrounding the canister should be used. For other types of enclosures, please consult the factory. 7. Reduction in the long time melting current of the fuses (approximately one hour and longer) due to higher ambient temperatures and use in enclosures is the same as described above for "maximum continuous currents". See time-current characteristics for melting characteristics in this time region. January 2001 * Supersedes June 1997 * 2001 Hi-Tech Fuses, Inc. 4 Trans-Guard FX Full-Range Current-Limiting Fuses Application Tables: Table 3 - Recommended Trans-Guard FX Mounted in a Dry Well Canister in Oil (Maximum Oil Temperature of 100 C) Recommended Fuse Current Ratings (Amperes) Fuse Voltage 8.3 kV 15.5 kV Transformer 1-Phase Voltage Rating (kV) Phase-to-Ground 1-Phase Transformer 2.4 4.16 4.8 7.2 7.62 12 14.4 16 kVA A B A B A B A B A B A B A B A B b a a a a a 10 6 8 6 3 3 3 3 3 3a 15 8 12 6 6 3 3 3a 3a 3a b 25 18 25 8 12 8 10 6 6 3 3 3 37.5 20 40 12 20 12b 20 8 10 8b 10 6 6a 6a 50 30 50 18 30 18 25 10 18 10 12 6b 8 6 6 75 50 80 25 40 25 40 18 25 18 20 8 12 8 10 8b 10 100 60 100 40 50 40 50 20 30 20 30 12b 18 10 18 10b 12 167 100 60 100 60 100 40 50 30 40 20 30 18 25 18 20 250 80 80 50 80 50 80 30 50 25 40 20 30 333 100 80 100 60 100 40 60 40 50 25 40 500 60 80 50 80 40 60 750 80 80 60 100 1000 100 23 kV 19.9 A B 6a 6a 6a 6a 6a b 6 8 8b 8 12 18 18 25 20 30 30 50 Note: Column A = 140-200% of transformer rating and Column B = 200-300% of transformer rating Table 4 - Recommended Trans-Guard FX Mounted in a Dry Well Canister in Oil (Maximum Oil Temperature of 100 C) Fuse Voltage 3-Phase Transformer kVA 15 22.5 30 45 75 100 112.5 150 200 225 300 500 750 1000 1500 2000 2.4 A 8 10 18 25 40 50 60 80 80 B 6 10 18 20 40 50 60 80 100 Recommended Fuse Current Ratings (Amperes) 8.3 kV 15.5 kV 23 kV Transformer 3-Phase Voltage Rating (kV) Phase-to-Phase 13.222.94.16 4.8 7.2-7.96 8.32 12.47 14.4 20.8 24.9c A B A B A B A B A B A B A B A B 3 3 3a 3a 3a 3a 6a 6a 6 6a 3 3 3a 3a 6a 6a 6b 8 6 6a 3 3a 3a 6a 6a b a 8 12 8 10 6 6 3 3 6 6a b a 18 20 12 20 8 12 8 10 6 6 6 6a 20 30 20 25 12b 18 12 18 8b 10 6 8 6a 6a b b b 25 40 20 30 12 20 12 18 8 10 8 10 6 6a b 40 50 30 40 18 25 18 20 12 18 10 12 6 6 b b 50 60 40 50 25 40 20 30 12 20 12 20 8 10 8 10 50 80 50 60 25 50 25 40 18 25 12 20 8 12 8 10 80 100 60 80 40 50 30 50 20 30 20 30 12 18 12b 18 100 80 60 80 50 80 40 50 40 50 20 30 18 25 80 80 50 80 50 80 30 50 25 40 80 100 60 80 40 40 100 50 34.5c A B 6a 6a 6a 6a 6a 6a 6a 6a 6 6b 8 8b 10 12 20 20 30 25 40 40 50 Note: Column A = 140-200% of transformer rating and Column B = 200-300% of transformer rating January 2001 * Supersedes June 1997 * 2001 Hi-Tech Fuses, Inc. 5 Trans-Guard FX Full-Range Current-Limiting Fuses Table 5 - Recommended Trans-Guard FX Mounted in Air at 40 C Ambient Temperature Fuse Voltage 3-Phase Transformer kVA 2.4 A B 15 22.5 30 10 45 b Recommended Fuse Current Ratings (Amperes) (5.5 kV) 8.3 kV 15.5 kV Transformer 3-Phase Voltage Rating (kV) Phase-to-Phase 13.24.16 4.8 7.2-7.96 8.32 12.47 20.8 14.4 A B A B A B A B A B A B A B 23 kV 22.924.9c A B 3 3a 3a 3a 3a 6a 6a 6a 8 6a 6a 3a 3a 3a 3a 6a 6a 6a a 3 3 a 3 a a a 6a 6 6 12 18 8 8 6a 6a 3 3 6a 6a 6a 75 20 30 12 18 12b 18 10 8 6 6a 6a 6a 6a 100 30 40 18 20 18 20 12 8 6 6a 6a 6a 8 6 a a 6a 10 6 8b 10b 12 b 18 112.5 40 50 20 25 18 25 12 150 50 65 25 40 25 40 18b 20 12 18 10b 12 200 65 100 30 50 30 40 20 30 18 25 12b 18 12b 30 b 500 750 1000 65 100 100 (150) (200) 250 250 40 50 80 65 80 (125) 40 50 80 50 65 125 25 30 50 12 30 20 40 25 65 8 12 40 40 65 18 c 8b 18 12 25 18 18 18 6 8b 8 20 12 8 6 6 6 6a 8b 8 6a b 8 10 8 b 18 10 12 b 8 40 25 40 18 25 18 25 12 65 40 65 25 40 20 40 18 25 65 100 65 80 30 50 30 50 20 30 c c c c (200) 250 (200) 250 100 130 100 125 250 160 200 130 200 100 130 80 130 50 200 50 30 200c 250c 130 200 100 160 40 160 200 130 200 50 2500 3000 200 200 Note: Column A = 140-200% of transformer rating and Column B = 200-300% of transformer rating Notes for Tables 3, 4 and 5: c 8 25 2000 b 6 b (150) (200) 125 (200) 65 100 65c 100c 40 1500 a B 3 6 300 A 6 12 225 34.5c Recommended fuses meet inrush criteria of 12 times transformer full load current for 0.1 second and 25 times transformer full load current for 0.01 second. Fuses also meet cold load pickup criteria of 6 times transformer full load current for 1 second and 3 times transformer full load current for 10 seconds. Shaded areas indicate parallel fuse applications. Ratings in parentheses are 5.5 kV rated fuses. Fuse allows greater than 300% of transformer rating. Fuse allows greater than 200% of transformer rating. Recommendations limited to gndY-gndY transformers with no more than 50% delta connected secondary load. Phase-to-ground rated fuses are frequently recommended for gndY-gndY three phase transformers. For some 8.32 kV transformers, parallel 2" fuses (rated max. voltage 10kV) can be used for delta connected transformers. January 2001 * Supersedes June 1997 * 2001 Hi-Tech Fuses, Inc. 6 18 50 Trans-Guard FX Full-Range Current-Limiting Fuses Ordering Information: To order the proper fuse for a particular application, first determine the correct fuse voltage and current rating using either the appropriate application table (Tables 3-5) or the published performance data (Tables 2a-2b, the applicable TCC and Peak Let-through Characteristics FC-016A). Then refer to Table 6 to determine the appropria te catalog number. Table 6 - Trans-Guard FX Catalog Information Continuous Current Rating (amps) 5.5 kV 8.3 kV 15.5 kV 23.0 kV 3 6 8 10 12 18 20 25 30 40 50 60 65 80 80 100 100 125 130 150 160 200 200 250 HTFX320080 HTFX320100 HTFX320125 HTFX320150 HTFX320200 - HTFX230003 HTFX230006 HTFX230008 HTFX230010 HTFX230012 HTFX230018 HTFX230020 HTFX230025 HTFX230030 HTFX230040 HTFX230050 HTFX230030 HTFX330065 HTFX330080 HTFX230040 HTFX330100 HTFX230050 HTFX330125 HTFX330065 HTFX330080 HTFX330100 HTFX330125 HTFX240003 HTFX240006 HTFX240008 HTFX240010 HTFX240012 HTFX240018 HTFX240020 HTFX240025 HTFX240030 HTFX240040 HTFX240050 HTFX240030 HTFX340065 HTFX340080 HTFX240040 HTFX340100 HTFX240050 HTFX340065 HTFX340080 HTFX340100 - HTFX250006 HTFX250008 HTFX250010 HTFX250012 HTFX250018 HTFX250020 HTFX250025 HTFX250030 HTFX250040 HTFX250050 - Catalog Number Notes to Table 6: 1. To order a fuse having a blown fuse indicator, replace the 7th character ("0") in the catalog number with an "1" (EXAMPLE: HTFX241040). Please note that indicator fuses are not suitable for dry-well canister applications. For an outdoor version (weatherproofed exterior surface), replace the 7th character ("0") in the catalog number with a "6" (EXAMPLE: HTFX246050). 2. Shaded current ratings shown are achieved by using a parallel combination of two fuses (order two fuses). No warranty or representation, expressed or implied, including any implied warranty of merchantability or fitness for a particular purpose regarding the product described herein is extended by anything contained in this brochure. KHT Fuses, LLC neither assumes nor authorized any other person, firm or entity to assume for it any liability in connection with the sale or use of the product described in this brochure. Any such warranties or other terms and conditions of sale of products shall be in accordance with KHT Fuses, LLC standard terms and conditions of sale for such products, which are available on request. KHT Fuses, LLC (a Hi-Tech Fuses Company ) 415 19th St. Dr. SE, Hickory, NC 28602 Phone: 828-322-1855 Fax: 828-322-2376 Internet:www.hi-techfuses.com January 2001 * Supersedes June 1997 * 2001 Hi-Tech Fuses, Inc. 7