Figure 1. ELSP Current-Limiting Backup Fuse. INSTALLATION

Transcription

1 Fusing Equipment Current-Limiting Backup Fuse Electrical Apparatus - GENERAL The Cooper Power Systems Current-limiting Backup Fuse is used in series with low current primary protection devices such as a Bay-O-Net Fuse or MagneX Interrupter. The fuse is designed for use in transformer oil, Envirotemp FR3 fluid, or an approved equivalent. The fuse s highly efficient currentlimiting section minimizes the effects of high fault current stresses on equipment and the distribution system. Its minimum interrupting rating is coordinated with that of a low current interrupter to avoid undesirable low current operation; yet its maximum interrupting rating will clear the highest fault currents likely to occur. Higher continuous current ratings can be achieved by connecting two fuses in parallel. APPLICATION The fuse is used in transformers to protect and isolate faulted equipment. When connected in series with a low current primary protection device, the fuse becomes an element of a twopart protection system that gives a full range of fault protection. This two-part system provides low current protection with the replaceable expulsion fuse or resettable MagneX Interrupter, and it adds the energylimiting protection of a current-limiting fuse. Together, they coordinate easily with upstream and downstream devices. Figure 1. Current-Limiting Backup Fuse. INSTALLATION No special tools are required. The fuse is liquid immersed, mounted as near as possible to the incoming primary bushing to which it is connected. Normal liquid dielectric clearances should be used. Refer to Installation Instructions Sheet S--1 for details. PRODUCTION TESTS Tests are conducted on percent of production in accordance with Cooper Power Systems requirements. Physical Inspection I t Testing Resistance Testing Helium Mass Spectrometer Leak Testing TABLE 1 Electrical s and Characteristics Fuse Type Backup (Partial Range) C Rated Maximum Interrupting Current,000 A rms symmetrical* *See Table for fuses with ratings other than,000 A rms symmetrical May 007 Supersedes /07 Printed in U.S.A. 1

2 Current-Limiting Backup Fuse HIGH PURITY SILICA SAND FILLER Specific particle size, purity, and compaction gives the heat-absorbing and arc-quenching properties necessary for consistent clearing and low energy let-thru levels. MICA SPIDER Provides stable winding support without generating gas and pressure buildup during fuse operation. A B C SOLID COPPER END CAPS Brass inserts are tapped for attachment of a 1 /4 inch - 0 x 1 / inch lead hardware. DOUBLE SEALING SYSTEM Buna-N rubber gasket and epoxy sealant ensures seal performance and integrity. FIBERGLASS HOUSING Provides strength and maintains integrity of fuse during any interruption, from minimum melt current to maximum rated current of ka. INDELIBLE IDENTIFICATION LABEL Easy-to-read voltage and current ratings and catalog numbers. PURE SILVER ELEMENT Stable under current cycling and thermal stress, providing consistent melt characteristics. The ribbons effectively control and minimize peak arc voltage levels resulting from high current interrup tions. During inter rup tion, the element effectively controls and limits both current and energy (l t) let-thru levels. Figure. diameter Current-Limiting Back-up Fuse cutaway shows design characteristics. Note: Dimensions given are for reference only. TABLE Interrupting s Continuous Current Minimum Interrupting Capacity 8.3 kv kv 3 kv 3 Minimum Melt I Maximum t (A Clear I Minimum Minimum t s) (A Interrupting Melt I Maximum t s) Capacity (A Clear I Minimum Minimum t s) (A Interrupting Melt I t s) Capacity (A s) Maximum Clear I t (A s) 1,00 5,800 1,00 7, ,00 10,0 15 1,800 8,00 1 1,800 11, ,800 15, 1 4, 16,0 00 4, 3, , 34,0 0 6,00 6, ,00 33, ,00 38, ,600 4,900 9,600 5, ,600 68,0 3 17, 6, , 93, , 11, ,0 97,800 0,0 15,700 0,0 149, , , ,900 16, , , ,600 45, ,600 7,0 ** 800 1, , ,000 8, , , 0** 0 175, , , , , ,000 3** ,0 875, ,0 88,000 Notes: 1. The 8.3 kv, A through A ratings have been tested and approved for application at 9.9 kv. The maximum interrupting capacity for the A through A ratings at 9.9 kv is 18 ka.. The 15.5 kv, through 15 A and A ratings have been tested and approved for application at 17. kv. The maximum interrupting rating for the 15.5 kv fuse, A through 15 A at 17. kv is 43 ka. For the 15 kv, A fuse at 17. kv the maximum interrupting rating is 1 ka. 3. The maximum interrupting rating for the 3 kv fuse, 80 A through 1 A, 0 A and 3 A, is ka. For the 3 kv, A fuse the maximum interrupting rating is 1 ka. ** Parallel Fuses

3 - B C Figure 3. 3 diameter Current-Limiting Backup Fuse cutaway shows design characteristics. Note: Dimensions given are for reference only. TABLE 3 Dimensional Information Voltage (kv) Current A Dim. in/ (mm) - 7. (183) (44) (77) (47) (356) (414) (33) (49) 1-1 n/a B Dim. in/ (mm) 6.0 (15) 8.4 (14) 9.7 (47) 8.5 (16) 1.8 (35) 15.1 (384) 11.5 (9) 15.6 (396) 18.9 (480) C Dim. in/ (mm) (76) Ref. Figure 3 ORDERING INFORMATION To order an current-limiting fuse, de ter mine the am per age and voltage ratings of the ap pli ca tion and specify the fuse required from Table 4. For parallel fusing, order two fuses. TABLE 4 Back-Up Fuse Catalog Numbers Catalog Number Current 8.3 kv 15.5 kv 3 kv 354M61M 354M61M 354M61M 354M61M 354M61M 354M61M 354M61M 354M61M 354M61M 354M61M 354M61M 354M61M M71M 35480M71M M71M 3543M71M 3544M71M 3545M71M M71M M71M M71M M71M 35441M71M 35451M71M M71M N/A 35451M71M * M71M M71M M71M 0* 35431M71M 35441M71M 35451M71M 3* 35431M71M N/A 35451M71M * Parallel fuse application (ORDER TWO FUSES) Method A CORRELATION INFORMATION Use the correlation information in Tables 5, 6 and 7 to determine the amperage and voltage ratings of the fuse combination required for the application. Then use Table 4 to determine the appropriate fuse catalog number. Correlation is based on IEEE Standard C57.9 Loading Guide and IEEE Standard C Through-Fault Guide, and the Fuse Application Guide CP766A. Tables 5, 6 and 7 indicate the rec om mend ed Bay-O-Net fuse link or MagneX Interrupter and combination for each application. To order a current sensing Bay-O- Net Fuse, complete catalog number To order a dual sensing Bay-O-Net Fuse, complete catalog number To order a dual element Bay-O-Net Fuse, complete catalog number To order a High Ampere Overload Bay-O-Net Fuse, complete catalog number Examples: To order an and dual element Bay-O-Net fuse combination for a single-phase, 7. kv phase-to-ground, kva transformer, specify: 1 A Fuse 354M61M 1 Bay-O-Net Fuse 38108C07 3

4 Current-Limiting Backup Fuse TABLE 5 Recommended Single-Phase Transformer Bay-O-Net and Combinations 8.3 kv Nominal Single-Phase Voltage (KV) Phase-to-Ground Single- Phase Transformer (KVA) and Current Sensing Bay-O-Net Fuse Combinations a C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C17 and Dual Sensing Bay-O-Net Fuse Combinations b C C C C C C C C C C C C C1 1.9 C C C C C C C1 1.9 C C C C C C and Dual Element Bay-O-Net Fuse Combinations b C C C C C C C C C C C C C C C C C C C C C C1.0 C C C High Amp Overload Bay-O-Net/ Combinations C03CB C04CB**.6 1 C03CB C05CB*** C04CB C05CB C03CB** C05CB*** C04CB** Indicates parallel fuse application Notes: The following tables show minimum recommended fuse ratings. Recommended backup fuse will coordinate with protecting fuse and melt only on internal transformer faults. Rec om mended Bay-O-Net fuses meet inrush criterion of 1 times transformer full load current for 0.1 second. If a different transformer impedance is used, a different Fuse rating may be required. If a larger % is used, a smaller may coordinate. a. Current sensing Bay-O-Net fuse is selected to melt at 3 to 4 times transformer full load in 0 seconds. b. Dual sensing and Dual element Bay-O-Net fuses are selected to limit transformer load to approximately 160% for 7 hours and 00% for hours with the trans former initially carrying 75% of rated load at ambient temperature of 35 C. ** The use of these fuses will provide 175% of rated load for hours and 1% of rated load for 7 hours. The use of the next larger fuse is recommended for greater overload capacity. Contact your Cooper Power Systems representative for specific overload capability. *** The specified fuse provides slightly less than 175% of rated load for hours and 1% of rated load for 7 hours. Contact your Cooper Power Systems representative for specific overload capability. 4

5 - TABLE 5 (Continued) Recommended Single-Phase Transformer Bay-O-Net and Combinations 15.5 kv 3 kv Nominal Single-Phase Voltage (kv) Phase-to-Ground Single-Phase Transformer (kva) and Current Sensing Bay-O-Net Fuse Combinations a C C C C C C C C C C C C C C C C C C C C C C C C C C C C06.0 C08.0 C08.0 C08.0 C C10.6 C10.6 C10.6 C C1 4.0 C1 4.0 C C C C1 5.0 C C C C C C14 and Dual Sensing Bay-O-Net Fuse Combinations b C C C C C C C C C C C C C C C C C C C C C C C C C C C C05.0 C08.0 C08.0 C08.0 C C10.6 C10.6 C10.6 C C C1 4.0 C C C C C1 5.0 C C C c C C10 and Dual Element Bay-O-Net Fuse Combinations b C C C C C C C C C C C C C C C C C C C C C C C C C C C C C09.0 C07.0 C07.0 C C C09.6 C07.6 C C C C1 5.0 C High Amp Overload Bay-O-Net/ Combinations C03CB C03CB Indicates parallel fuse application Note: Table shows minimum recommended fuse ratings. Recommended backup fuse will coordinate with protecting fuse and melt only on internal transformer faults. Recom mended Bay-O-Net fuses meet inrush criterion of 1 times transformer full load current for 0.1 second. a. Current sensing Bay-O-Net fuse is selected to melt at 3 to 4 times transformer full load in 0 seconds. b. Dual sensing and Dual element Bay-O-Net fuses are selected to limit transformer load to approximately 160% for 7 hours and 00% for hours with the trans former initially carrying 75% of rated load at ambient temperature of 35 C. c. Use 3.0 kv rated fuse for this application. (See Table, note, page of this catalog section). 5

6 Current-Limiting Backup Fuse TABLE 6 Recommended Three-Phase Transformer Bay-O-Net and Combinations 8.3 kv Nominal Three-Phase Voltage (KV) Phase-to-Phase Three- Phase Transformer (KVA) and Current Sensing Bay-O-Net Fuse Combinations a C C C C C C C1 1.8 C C C C C C C C C C C C C C C C and Dual Sensing Bay-O-Net Fuse Combinations b C C C C C C C C C C C C C C C C C C and Dual Element Bay-O-Net Fuse Combinations b C C C C C C C C C C C C C C High Amp Overload Bay-O-Net/ Combinations C03CB C04CB C04CB** C03CB C03CB C05CB*** C04CB** C04CB C05CB*** C04CB C05CB Indicates parallel fuse application Note: Table shows minimum recommended fuse rating. Recommended backup fuse will coordinate with protecting fuse and melt only on internal transformer faults. Recommended Bay-O-Net fuses meet inrush criterion of 1 times transformer full load current for 0.1 second. a. Current sensing Bay-O-Net fuse is selected to melt at 3 to 4 times transformer full load in 0 seconds. b. Dual sensing and Dual element Bay-O-Net fuses are selected to limit transformer load to approximately 160% for 7 hours and 00% for hours with the trans former initially carrying 75% of rated load at ambient temperature of 35 C. ** The use of these fuses will provide 175% of rated load for hours and 1% of rated load for 7 hours. The use of the next larger fuse is recommended for greater overload capacity. Contact your Cooper Power Systems representative for specific overload capability. *** The specified fuse provides slightly less than 175% of rated load for hours and 1% of rated load for 7 hours. Contact your Cooper Power Systems representative for specific overload capability. 6

7 - TABLE 6 (Continued) Recommended Three-Phase Transformer Bay-O-Net and Combinations 15.5 kv Nominal Three-Phase Voltage (kv) Phase-to-Phase d 4.9d Three-Phase Transformer (kva) and Current Sensing Bay-O-Net Fuse Combinations a C C C C C C C C C C C C C08.0 C08.0 C06.0 C C C C C C C C C C1 4.0 C1 4.0 C C C C C C C C C C C C C C C C C16 and Dual Sensing Bay-O-Net Fuse Combinations b C C C C C C C C C C C C C08.0 C08.0 C05.0 C C C C C C C C C C C1 4.0 C C C C C C C C C C C C C14 and Dual Element Bay-O-Net Fuse Combinations b C C C C C C C C C C C C C07.0 C07.0 C06.0 C C C C C C C C C C1 4.0 C C C C C C C C C High Amp Overload Bay-O-Net/ Combinations C03CB C04CB C03CB C04CB** 5.75 C04CB C03CB C03CB C05CB*** 5.75 C05CB 5.75 C04CB 5.75 C04CB C05CB*** 5.75 C05CB*** 5.75 C04CB** 5.75 C04CB Indicates parallel fuse application Note: Table shows minimum recommended fuse rating. Recommended backup fuse will coordinate with protecting fuse and melt only on internal transformer faults. Recommended Bay-O-Net fuses meet inrush criterion of 1 times transformer full load current for 0.1 second. a. Current sensing Bay-O-Net fuse is selected to melt at 3 to 4 times transformer full load in 0 seconds. b. Dual sensing and Dual element Bay-O-Net fuses are selected to limit transformer load to approximately 160% for 7 hours and 00% for hours with the trans former initially carrying 75% of rated load at ambient temperature of 35 C. c. 3 kv delta primary transformer connection. d. Recommended fuse is limited to gnd Y/gnd Y transformer with no more than % delta connected secondary load and with neutral internally grounded. Phase-to-ground rated fuses are frequently recommended for gnd Y-gnd Y connections. ** The use of these fuses will provide 175% of rated load for hours and 1% of rated load for 7 hours. The use of the next larger fuse is recommended for greater overload capacity. Contact your Cooper Power Systems representative for specific overload capability. *** The specified fuse provides slightly less than 175% of rated load for hours and 1% of rated load for 7 hours. Contact your Cooper Power Systems representative for specific overload capability. 7

8 Current-Limiting Backup Fuse TABLE 6 (Continued) Recommended Three-Phase Transformer Bay-O-Net and Combinations 3 kv Nominal Three-Phase Voltage (KV) Phase-to-Phase 3 c 7.6 d 34.5 d Three- Phase Transformer Rat- Rat- Rat- (KVA) ing ing ing and Current Sensing Bay-O-Net Fuse Combinations a C C C C C C C C C C06.0 C06.0 C C C C C C C C C C C C C C C C C C C C C C14 and Dual Sensing Bay-O-Net Fuse Combinations b C C C C C C C C C C05.0 C05.0 C C C C C C C C C C C C C C C C C C C C14 and Dual Element Bay-O-Net Fuse Combinations b C C C C C C C C C C05.0 C04.0 C C C C C C C C Indicates parallel fuse application Note: Table shows minimum recommended fuse rating. Recommended backup fuse will coordinate with protecting fuse and melt only on internal transformer faults. Recommended Bay-O-Net fuses meet inrush criterion of 1 times transformer full load current for 0.1 second. a. Current sensing Bay-O-Net fuse is selected to melt at 3 to 4 times transformer full load in 0 seconds. b. Dual sensing and Dual element Bay-O-Net fuses are selected to limit transformer load to approximately 160% for 7 hours and 00% for hours with the trans former initially carrying 75% of rated load at ambient temperature of 35 C. c. 3 kv delta primary transformer connection. d. Recommended fuse is limited to gnd Y/gnd Y transformer with no more than % delta connected secondary load and with neutral internally grounded. Phase-to-ground rated fuses are frequently recommended for gnd Y-gnd Y connections. 8

9 - TABLE 7 Recommended MagneX Interrupter and Current-Limiting Fuse Combinations Nominal Single Phase (kv Phase-to-ground) 10 kva % = kva. % = kva % = kva % = 1.9 kva % = kva % = 1.9 kva % = kva % = E5 1 E 1 E - 1 E 1 E - E1 15 E5 1 E 1 E 8.3 kv 15.5 kv 3 kv Notes: The MagneX Interrupter recommendations are based on: Deration factor of 0.5% per C above 5 C. Allowable loading greater than 1% for four hours in accordance with IEEE Standard C guide for Loading Distribution Transformers, Table 6. If using a MagneX Interrupter equipped without emergency overload, a smaller rating may be used. E1 15 E5 1 E E1 15 E5 1 E E1 15 E5 1 E 1 E E01 E1 E01 E E01 E1 E01 E01 E1 9

10 Current-Limiting Backup Fuse See the Following Catalog Sections for Additional Information: Fuse Holder Section -53 Bay-O-Net Fuse Holder Assembly Section - Current Sensing Bay-O-Net Fuse Section -45 Dual Sensing Bay-O-Net Fuse Section -46 Dual Element Bay-O-Net Fuse Section -48 High Ampere Overload Bay-O-Net Fuse Section -49 MagneX Interrupter Section -34 (previously 800-) Contact your Cooper Power Systems representative for further in for ma tion or other applications. Method B TIME CURRENT CURVES To determine or confirm the fuse that will coordinate with up stream and downstream system requirements, use the time-current characteristic curves and specify the fuse in di cated from Table 4. For full size TCC curves R (8.3 kv), R-91-7 (15.5 kv), and R (3.0 kv), contact your Cooper Power Systems rep re sen ta tive. 10

11 - 11

12 007 Cooper Power Systems, Inc., or its affiliates MagneX, Envirotemp, and FR3 are registered trademarks of Cooper Power Systems, Inc., or its affiliates IEEE Standard C57.9, IEEE Standard C57.91 and IEEE C are trademarks of the Institute of Electrical and Electronics Engineer, Inc Hickory Street Pewaukee, WI 57 USA