Fluid-Filled Overhead Distribution Transformers Document 2.4.
Document 2.4.95, Revision 0 May. 2013 Fluid-Filled Overhead Distribution Transformers ! READ THIS IMPORTANT SAFETY INFORMATION ▲ READ THIS ENTIRE INSTRUCTION MANUAL CAREFULLY AND BECOME FAMILIAR WITH THE EQUIPMENT AND ALL SAFETY-RELATED INFORMATION BEFORE PROCEEDING WITH INSTALLATION, OPERATION, OR MAINTENANCE ACTIVITIES. Safe use of this equipment is dependent on proper installation, operation, and maintenance procedures. Follow all applicable local and national codes.
Document 2.4.
Document 2.4.95, Revision 0 May.
Fluid-Filled Overhead Distribution Transformers Document 2.4.95, Revision 0 May, 2013 SECTION 1: INTRODUCTION This document is intended as a general guide for the installation, operation and maintenance of Howard Industries fluid-filled, overhead distribution transformers. Although every effort has been made to ensure accuracy and completeness, these instructions do not address every conceivable application or circumstance that might be encountered.
Document 2.4.95, Revision 0 May. 2013 Fluid-Filled Overhead Distribution Transformers SECTION 2: RECEIVING, HANDLING, AND STORAGE Drawings and Documents Locate all shipping papers, packing lists, specifications, and other pertinent information for use during inspection. Verify that the transformer is supplied with a nameplate, required warning labels, and terminal designation markings. Verify that the terminal designation markings are consistent with those on the nameplate.
Fluid-Filled Overhead Distribution Transformers additional items may arrive on separate pallets. Claims for shortages or errors must be noted on the shipping documents and reported immediately to the Howard Industries Transformer Division. Failure to make a timely claim will constitute unqualified acceptance and a waiver of all such claims by the purchaser. 3.
Document 2.4.95, Revision 0 May. 2013 containers. Do not store the transformer in a corrosive environment. Transformers may be stored in racks designed for that purpose. Transformers should not be stacked directly on top of one another, as this may damage the tank and bushings. If the transformer is to be stored for an extended period of time before being placed into service, it should be stored on a firm level surface.
Document 2.4.95, Revision 0 May, 2013 Fluid-Filled Overhead Distribution Transformers SECTION 3: INSTALLATION Lifting and Handling Overhead transformers may be lifted by crane or hoist. Properly palletized transformers may also be lifted by a forklift truck. Refer to the transformer nameplate to determine the total weight of the assembled transformer and make sure that the lifting equipment, hooks, cables, slings and spreader bars are adequate to perform a safe lift.
Document 2.4.95, Revision 0 May. 2013 When specified by the user, base skids are provided for mounting the transformer on a solid, level surface, rather than on a pole. The factory may elect to provide skids for transformers whose weight exceeds the capability of pole-mounting brackets. The mounting surface must be rated to support the weight of the completely assembled transformer. Refer to the transformer nameplate for the weight of the transformer.
Document 2.4.95, Revision 0 May, 2013 Fluid-Filled Overhead Distribution Transformers SECTION 4: INSPECTION AND TESTING Pre-Energization Inspection and Tests After the transformer has been installed, but before it is energized, the following tests and checks should be performed at a minimum to ensure that the transformer is ready to be energized. The transformer should not be energized without successfully completing these tests and checks.
Document 2.4.95, Revision 0 May. 2013 voltage switch is in the parallel position. Before removing the cover or handhole cover, refer to “Opening the Transformer Tank” for instructions. 5. Grounding—Check to ensure that the transformer tank is securely and effectively grounded. The transformer tank ground pad or nut is located on the tank. 6. Bolted Connections—Check all bolted connections for tightness, referring to nominal torque guidelines contained in Tables 1 through 4. 7.
Fluid-Filled Overhead Distribution Transformers Document 2.4.95, Revision 0 May, 2013 2. C hecking for Leaks—Check the tank to make sure there are no fluid leaks. 3. O bserving Operation—After the transformer is initially energized, visually inspect it to make sure that no abnormal conditions are observed. 4. C hecking Gauges—Observe the fluid level and fluid temperature gauges (if provided) to confirm the proper fluid level and temperature. 5.
Document 2.4.95, Revision 0 May. 2013 Fluid-Filled Overhead Distribution Transformers SECTION 5: OPERATION OF SWITCHING AND PROTECTIVE DEVICES The following operating instructions and descriptions of switching and fusing devices are intended to be a general guide for operation of Howard Industries fluid-filled overhead distribution transformers in normal environments.
Fluid-Filled Overhead Distribution Transformers multiple high-voltage windings. Although not recommended, these transformers also can be designed with both high-voltage taps and multiple high-voltage windings. When both are provided, extreme care must be taken to ensure that the tap switch setting is in the position shown on the nameplate when the multiple-voltage switch is in the parallel position. Failure to set the tap switch in the correct position could result in an unsafe condition.
Document 2.4.95, Revision 0 May. 2013 Replacement fuses should have the proper rating and operating characteristics. Refer to the circuit diagram on the transformer nameplate for the location of fuses. ! WARNING ▲ FAILURE TO FOLLOW THE INSTRUCTIONS BELOW COULD RESULT IN DEATH OR SERIOUS PERSONAL INJURY, AND COULD ALSO RESULT IN DAMAGE TO THE EQUIPMENT. • D o not replace a blown fuse unless the cause of the fuse operation has been identified and corrected.
Fluid-Filled Overhead Distribution Transformers Document 2.4.95, Revision 0 May, 2013 surge arrester is designed to be fluid immersed and mounted inside the transformer tank. It is recommended that the fluid-immersed MOV arrester not be exposed to an average fluid temperature exceeding 90°C (194°F) or a maximum fluid temperature exceeding 125°C (257°F). − To open the circuit breaker, rotate the handle so that the pointer is at the OPEN (“O”) position.
Document 2.4.95, Revision 0 May. 2013 general guide for operation of the Magnex Interrupter. Personnel should read and follow Cooper Power Systems Magnex Interrupter Installation Instructions S240-34-1. The operating handle is located on the side of the transformer tank and is designed to be operated with a live-line tool (hot stick), as follows. − To open the interrupter, rotate the handle upward in a counterclockwise direction, until the spring-loaded contacts open and the handle is in the OPEN position.
Fluid-Filled Overhead Distribution Transformers Document 2.4.95, Revision 0 May, 2013 SECTION 6: OPERATION OF BUSHINGS, GAUGES AND ACCESSORY DEVICES Some of the devices described below are optional and may not be present in any particular transformer design. The inclusion of particular accessory devices in any transformer design is governed by industry standards and by individual user specifications.
Document 2.4.95, Revision 0 May. 2013 Drain Valve and Sampling Device The drain valve and sampling device permit draining the transformer fluid and sampling the fluid for testing purposes. The valve is located near the bottom of the transformer tank. Refer to “Sampling and Testing the Fluid” and “Draining and Filling the Tank” for the fluid sampling and draining procedures.
Fluid-Filled Overhead Distribution Transformers Document 2.4.95, Revision 0 May, 2013 Line connections should be made without placing excessive cantilever load on the bushings. Excessive loading may cause bushing or gasket damage. ! WARNING ▲ FAILURE TO FOLLOW THE INSTRUCTIONS BELOW COULD RESULT IN MINOR OR MODERATE PERSONAL INJURY, AND COULD ALSO RESULT IN DAMAGE TO THE EQUIPMENT. Do not place excessive cantilever load on a lowvoltage or high-voltage bushing.
Document 2.4.95, Revision 0 May. 2013 Fluid-Filled Overhead Distribution Transformers SECTION 7: MAINTENANCE AND REPAIR These instructions are intended as a general guide for the maintenance and repair of Howard Industries fluid-filled overhead distribution transformers, when used in typical applications and operated in normal environments.
Fluid-Filled Overhead Distribution Transformers if provided. Be aware that fluid temperature and orientation of the transformer tank will cause the fluid level to vary. Transformers are filled to a level that corresponds to a fluid temperature of 25°C. The actual fluid level will increase with increasing temperature. The fluid level indication will also vary when the transformer is not installed in a level orientation.
Document 2.4.95, Revision 0 May. 2013 paint flakes and other debris. The surface should then be cleaned with a suitable solvent to remove any oil, grease or other contaminants. At least two coats of a high-quality touch-up paint should be applied to the damaged area. Bare metal should receive a primer coat before applying the final finish. Touch-up paint is available from the Howard Industries Transformer Division.
Fluid-Filled Overhead Distribution Transformers Magnex™ Interrupter The Magnex™ interrupter and protective link, if present, are accessible by removing the transformer cover or handhole cover. Interrupters do not normally require field adjustment. Defective interrupters should be replaced. Refer to “Opening the Transformer Tank” for instructions.
Document 2.4.95, Revision 0 May. 2013 Fill with fluid to fill line marked inside the transformer tank. Opening the Transformer Tank Transformer tanks are shipped sealed and should not be opened unless necessary. If it is necessary to open the tank, follow the instructions below and observe all safety warnings.
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Document 2.4.95, Revision 0 May. 2013 Additional Maintenance Instructions Features and accessory devices discussed herein may not be present in all transformer designs. Some features or accessory devices may be present on a transformer, but not discussed in these instructions. Howard Industries does not represent that these instructions are complete, sufficient, accurate or useful in all circumstances.
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Document 2.4.95, Revision 0 May.
Document 2.4.
Document 2.4.95, Revision 0 May. 2013 Fluid-Filled Overhead Distribution Transformers HI-102 Instructions for the Installation, Operation, and Maintenance of Fluid-Filled Overhead Distribution Transformers Document 2.4.95, Revision 0 (September 2012) Copyright © 2012, Howard Industries, Inc. Laurel, Mississippi Telephone: 601-425-3151 Fax: 601-649-8090 www.howardtransformers.
