GEI-10951M GEI-10952K GEI-13543 GEK-39196B EK-39196 9F61AAW612 9F61BFW394 - Datasheet Archive

 

(Inst-EK39196) Rev.-A Supersedes GEI-10951M, GEI-10952K, GEI-13543, and GEK-39196B Medium Voltage Current-limiting Fuses, Fuse

 

INSTRUCTIONS (Inst-EK39196) Rev.-A Supersedes GEI-10951M GEI-10951M, GEI-10952K GEI-10952K, GEI-13543 GEI-13543, and GEK-39196B GEK-39196B Medium Voltage Current-limiting Fuses, Fuse Supports, & fuse Disconnecting Switches CAUTION: The equipment covered by these instructions should be installed and serviced only by competent personnel familiar with good safety practices. This instruction is written for such personnel and is not intended as a substitute for adequate training and experience in safe procedures for this type of equipment. and extinguished without any expulsion of gases or material from the tube. The maximum current passing through the fuse before the arc is extinguished is limited to a value considerably lower than the maximum short-circuit current usually available in the circuit. INTRODUCTION Type EK fuse supports, with Type EJ current-limiting fuses, are used for short-circuit protection of power transformers and feeder circuits. The Type EK fuse disconnecting switches are similar, except that the contact assemblies are designed to permit the fuse unit to be used as a disconnecting switch. APPLICATION General The complete lines and all sizes of Type EK fuse supports and fuse disconnecting switches are shown in the Figures 1 through 4. NOTE: Check with factory for fuses to be used in hazardous locations. Ferraz Shawmut EK fuse supports and switches accommodate Type EJ current-limiting fuse units. The fuse voltage rating, current rating and, in turn, the size (ferrule diameter) is determined by service requirements. Type EK switches and supports are used for indoor installations, while Type EKO are used outdoors. The dash one (-1) designation indicates a fuse support, and the dash three (-3) a fuse disconnecting switch. It should be noted that disconnecting switches are not load-breaking devices; therefore, the circuit must be open prior to the fuse disconnection. The letter suffix following the (-1) or the (-3) shows the fuse size. Example: Type EK-1B indicates that the device is an indoor fuse support for a Size B, Type EJ, current-limiting fuse unit. Ferrule diameters corresponding to fuse sizes are shown in Table 1. Table 1 Fuse Size The EK mountings are available in voltage ratings from 2400 to 38,000. The standard terminals available for Type EK fuse mountings are adjustable to take a range of conductor sizes from No. 2 wire to 250 MCM cable. Receiving, Handling & Storage RECEIVING Immediately upon receipt of a fuse support or switch, examine it for any damage or loss sustained in transit. If injury or rough handling is evident file a damage claim at once with the transportation company and promptly notify Ferraz Shawmut. Check the contents of all crates and boxes against the shipping memorandum. Notify Ferraz Shawmut of any shortages or discrepancies. All indoor supports and disconnecting switches are shipped fully assembled. Outdoor supports and switches are fully assembled for domestic shipment. One set of fuse-unit fittings is included with a Type EK-3 or EKO-3 fuse disconnecting switch, and is always shipped tied to the switch parts. Ferrule Diameter B C D DD DDDD EE RATINGS 1-9/16 inches 2 inches 3 inches two-3 inch in parallel four-3 inch in parallel two-4 inch in parallel A Type EJ fuse unit - for indoor use - or a Type EJO fuse unit - for indoor or outdoor use ­ consists of a fuse tube having metal ferrules at each end and containing currentresponsive elements surrounded by a quartz filler. When the fuse functions, the arc resulting from the melting of the current-responsive elements is cooled by the adjacent filler HANDLING Care should be exercised in handling the insulators and fuses since they are breakable. 1 EK-39196 EK-39196 Rev. -A, Fuses, Fuse Supports, and Fuse Disconnect Switches EK-1B EK-1C EK-1D EK-1DD EK-1EE EK-1DDDD Fig. 1. Type EK-1 fuse supports (indoor) EK-3C EK-3D EK-3DD Fig. 2. Type EK-3 fuse disconnecting switches (indoor) It should be noted that disconnecting switches are not load-breaking devices; therefore, the circuit must be open prior to the fuse disconnection. 2 Fuses, Fuse Supports, and Fuse Disconnect Switches, EK-39196 EK-39196 Rev. -A EKO-1C EKO-1D EKO-1DD EKO-1DDDD Fig. 3. Type EKO-1 fuse supports (outdoor) EKO-3C EKO-3D EKO-3DD Fig. 4. Type EKO-3 fuse disconnecting switches (outdoor) It should be noted that disconnecting switches are not load-breaking devices; therefore, the circuit must be open prior to the fuse disconnection. 3 EK-39196 EK-39196 Rev. -A, Fuses, Fuse Supports, and Fuse Disconnect Switches STORAGE The insulators should not be subject to mechanical or thermal stresses transmitted through the conductors. Bar or pipe connections from buses should be provided with flexible connectors, unless they are so shaped as to eliminate strain due to expansion and contraction of the bus. Supports and switches for indoor service should be kept in a dry place before installation. Supports and switches for outdoor service may be stored anywhere; but if stored outdoors, care should be taken to see that the insulator units are kept upright to prevent the collection of water inside the porcelain parts. ADJUSTMENTS If the support is properly mounted, so there is no buckling of the base, there should be no need for adjustment of switch parts. If, in the case of the disconnecting switches, the fuse strikes the clip on one side more than the other, the bolts holding the hinge support to the lower insulator maybe loosened, and the hinge support must be adjusted so the upper fuse ferrule enters the clips centrally. Tighten the bolts when correct adjustment is obtained. INSTALLATION LOCATION Type EK-1 or EKO-1 supports may be mounted, either vertically or horizontally, with the fuse on top. Fuse disconnecting switches, Type EK-3 or EKO-3, must be in the vertical position with hinge support on the bottom. When indoor supports or switches are mounted on a flat surface, 1/2-inch spacers must be placed under the base in order to provide clearance for the insulator mounting-bolt heads. EK-1 OR EKO-1 SUPPORTS Prior to inserting or removing a fuse from fuse support the circuit must be completely de-energized and grounded for maintenance. A fuse tong is the preferred method for inserting or removing fuses from support. When inserting a new fuse unit, be sure the fuse is firmly seated in the clip before removing the tongs. After removing the fuse, gloves may be required to handle the fuse because of high surface temperature. There should be ample room for installing and removing the fuse units. In the case of fuse disconnecting switches, clearance is necessary for opening the switch. MOUNTING After unpacking, and before installation on the supporting structure, the location of the mounting holes in the base should be compared with those in the structure. In case of a discrepancy, check with approved outline drawing and take appropriate action. In mounting the fuse supports and switches, especially those with outdoor insulator units, the rigging should be attached to the bases, and not to the insulator unit, contacts, or other parts, which might be damaged during the hoisting operation. With the unit in the mounting position, check to see that the base is supported evenly, so it will not be distorted when the mounting bolts are tightened. CONNECTIONS The conductors should be clean and bright before connecting to the terminals. In the case of flat bars, there should be no dents or burrs. Terminals which accommodate conductors from No. 2 wire to 250 MCM cable must be sourced separately. 4 Fuses, Fuse Supports, and Fuse Disconnect Switches, EK-39196 EK-39196 Rev. -A Fig. 5. EK-3D fuse-disconnecting switch in the closed position Fig. 6. EK-3D fuse-disconnecting switch in the open position Fig. 7. Fuse units assembled with fittings for Type EK-3D, EK-3DD, and EK-3C fuse disconnecting switch EK-3 OR EKO-3 SWITCHES With Type EK-3 and EKO-3 fuse disconnecting switches, fittings for the fuse unit are furnished to make it suitable for use as a disconnecting fuse. Before inserting the fuse unit in the EK-3 or EKO-3 switches, these fittings, shown in Figs. 7 and 8, must be assembled on the fuse unit. To attach these fittings to a fuse unit, slide them on the ferrules of the fuse unit and fasten in the position shown in Fig. 7. With a Size DD fuse unit, attach the hinge fitting to the bottom ferrule of one tube and the operating eye to the top ferrule of the other tube. In all cases, the hinge fitting should be located at the end of the fuse containing the indicating target, for ease of viewing from below. The target end of the fuse units have button indicators to indicate blown fuses. (See Fig. 9). These screws should only be tightened firmly with a hand screwdriver; excess force may cause damage to the fuse body. Prior to inserting or removing a fuse from fuse disconnecting switches, the circuit must be open. To insert size C, D, or DD fuse units, grip the tube firmly with the tongs. Insert the point of the hinge fitting behind the hinge bolt and lower the unit until it rests on the bolt. The tongs can then be removed; then insert the fuse hook in the operating eye and rotate the blade into the closed position. To remove the C, D, or DD unit from the switch, insert the hook in the operating eye and open the switch to the position shown in Fig. 6. Grip the tube firmly in the jaws of the fuse tongs and lift straight up. For size DD fittings, the connecting block should seat firmly in the slot cut in the hinge fitting. The fittings are provided with slotted cap screws to hold the fuse firmly. 5 Fuses, Fuse Supports, and Fuse Disconnect Switches, EK-39196 EK-39196 Rev. -A EK-3D and DD EK-3C 9F61AAW612 9F61AAW612 9F61BFW394 9F61BFW394 EKO-3C 9F61BJW397 9F61BJW397 EKO -3D EKO-3DD 9F61BKW398 9F61BKW398 9F61BLW399 9F61BLW399 Fig. 8. Fuse fittings for Type EK-3 and EKO-3 fuse disconnecting switches Button Type Indicator Before Operation After Operation Fig. 9. Typical blown fuse indicators FUSES When a fuse unit functions, it should be replaced by a complete new unit. Always use fuse tongs for handling unless special means are provided for disconnecting the fuse support from all sources of power. If used in a fuse disconnecting switch, the fittings should be removed from the blown unit and transferred to a replacement unit. The time required to replace a blown fuse unit in a disconnecting switch may be considerably shortened if a spare fuse unit with fittings in place is kept on hand at each installation. The indicating target operates when the fuse unit functions. Its operation is provided by a separate mechanism within the fuse tube, and is not due to any pressure developed by the main fuse elements in functioning. The appearance of the target for fuse units is shown, before and after operation, in Figure 9. The fuse units have an indicator consisting of a small plunger which projects from the end of the fuse unit after the fuse unit functions. 6 Fuses, Fuse Supports, and Fuse Disconnect Switches, EK-39196 EK-39196 Rev. -A Maintenance INSPECTION GENERAL At intervals of about one year (or more often depending on local conditions), an inspection of contact surfaces and other parts should be made to make sure damaged parts are replaced, the insulators and fuse tubes are free of contaminants, and the contacts are maintained in a bright appearance. When installing a new fuse unit in a support or switch, care must be taken to place the indicating end in a position where it can be seen. On vertically mounted 9F60 EJ-1 or EJ0-1 fuses, the indicator end should be at the bottom of the fuse. Renewal Parts The ferrules of the Type EJ or EJO fuse units are silver plated, and provide low contact resistance when the fuse clips are periodically checked for tightness. When ordering renewal parts, contact Ferraz Shawmut and furnish model number and the quantity required. For disconnecting switches, the time required to replace a "blown" fuse is considerably shortened if spare fuse units, with fittings attached, are kept on hand. Make sure fuse holder is clean before assembling the fuse. When ordering or replacing fuse units, specify the quantity required and give the model number, voltage and current rating as stamped on the fuse nameplate. NOTE: Gloves may be required when removing fuses because of high fuse surface temperature. Recommended lists of renewal parts are shown in Tables II, III and IV. NOTE: Do not use fuses which have been submerged in water or other liquids. TABLE II FUSE CLIPS* Fuse Size 9F61BWW460 9F61BWW460 10 C 9F61BWW457 9F61BWW457 11 D 9F61BWW459 9F61BWW459 12 D-D Fig. 11 See Fig. B Fig. 10 Model No. * 9F61BNW402 9F61BNW402 13 * Clips only; does not include mounting bracket or plate. * Clip sold as a single unit only (not in pairs). TABLE III OPERATING EYE Fuse Size 9F61BFW394 9F61BFW394 8 D 9F6lAWW612 8 D-D Fig. 13 Conversion Kit D to DD See Fig. C Fig. 12 Model No. 9F61AWW612 9F61AWW612 8 TABLE IV HINGE TRUNNION (FRONT-CONNECTED UNITS) Fuse Size See Fig. C 9F61BJW397 9F61BJW397 8 D 9F61BKW398 9F61BKW398 8 D-D 7 Model No. 9F61BLW399 9F61BLW399 8 A relentless pursuit of protection for electrical components, systems-and the people who use them. Ferraz Shawmut is an international company manufacturing the widest range of circuit protection solutions in the electrical industry. Drawing on a century of experience-and an ongoing commitment to critical research in electrical safety-we provide industrial, commercial, and OEM customers with innovative products and technical support teams to increase effectiveness, simplify applications, and enhance productivity. Learn more about our circuit protection solutions at us.ferrazshawmut.com. For more on Medium Voltage Current-Limiting Fuses, visit our website at us.ferrazshawmut.com. 374 Merrimac Street, Newburyport, MA 01950 T: 978-462-6662 F: 978-462-0181 88 Horner Avenue Toronto, Ontario, Canada M8Z 5Y3 T: 416-252-9371 Toll-Free: 800-267-8727 F: 416-252-6572 Toll-Free: 800-387-3329 © 2008 Ferraz Shawmut. All rights reserved. INST-EK39196-01/5 INST-EK39196-01/5,000/7.08/STASSOC 08/STASSOC Disclaimer: These instructions do not purport to cover all details or variations in equipment nor to provide for every possible contingency to be met in connection with installation, operation or maintenance. Should further information be desired or should particular problems arise, which are not covered sufficiently for the purchaser's purposes, the matter should be referred to Ferraz Shawmut.