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Summary of Contents for Howard Industries HI-110
- Page 1 Document 2.4.128, Revision 3 Network Transformer Instruction Manual October, 2017 Instructions (HI-110) Installation, Operation, and Maintenance of Secondary Network Transformers Howard Industries Distribution Transformer Division...
- Page 2 Features presented herein may not be present in all equipment designs. Standard and optional features are subject to change without notice. Howard Industries makes no representation or warranty with respect to and assumes no responsibility for the completeness, accuracy, sufficiency, or usefulness of these instructions.
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Page 3: Table Of Contents
Document 2.4.128, Revision 3 Network Transformer Instruction Manual October, 2017 Table of Contents SECTION 1: INTRODUCTION ..........................5 SECTION 2: RECEIVING, HANDLING AND STORAGE ..................6 Drawings and Documents ..........................6 Lifting and Handling ............................6 Initial Inspection ..............................6 Fluid Levels ................................7 Internal Inspection ............................7 Fluid Sampling ..............................7 Transformer Storage ............................7 SECTION 3: INSTALLATION ..........................9... - Page 4 Document 2.4.128, Revision 3 October, 2017 Network Transformer Instruction Manual SECTION 5: OPERATION OF SWITCHING AND PROTECTIVE DEVICES ............14 Tap Changer ..............................15 Series/Multiple or Delta/Wye Switch ......................15 Primary Disconnect and Grounding Switch Computer Support ..............16 Three-Position Non-Interrupting Primary Disconnect and Grounding Switch ..........16 Three-Position Mag-Break Primary Disconnect and Grounding Switch............
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Page 5: Section 1: Introduction
IEEE Standard C57.12.00. Questions regarding installation, operation, and maintenance (particularly when encountering unusual or special circumstances not sufficiently covered by these instructions) should be directed to the Howard Industries Transformer Division. IT IS IMPORTANT TO READ AND COMPLY WITH ALL SAFETY INFORMATION, INSTRUCTIONS AND... -
Page 6: Section 2: Receiving, Handling And Storage
Howard Industries Transformer Division prior to Transformers should be lifted in an upright position, unloading the transformer and before attempting any allowing no more than 15 degrees of tilt from repair. -
Page 7: Fluid Levels
The transformer and primary switch chamber are during transit. If moisture or contaminants in the shipped from the factory with insulating fluid filled fluid are suspected, contact the Howard Industries to the proper level. When provided, the primary Transformer Division immediately for instructions. - Page 8 Document 2.4.128, Revision 3 October, 2017 Network Transformer Instruction Manual containers. Do not store the transformer in a corrosive environment. 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. The gas space above the insulating fluid should be pressurized with dry nitrogen to a pressure of 2-3 PSIG.
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Page 9: Section 3: Installation
Contact the Howard Industries Transformer damaged. Refer to the transformer nameplate Division, if additional information is needed about to determine the total weight of the assembled location and mounting issues not covered by these transformer. -
Page 10: Grounding
Document 2.4.128, Revision 3 October, 2017 Network Transformer Instruction Manual depend on the transformer kVA, efficiency and Primary Connections load cycle. Forced ventilation may be required Network transformers are supplied with a high- to adequately cool the transformer. Refer to the voltage entrance as specified by the user, usually National Electric Code for recommended vault consisting of dead-front bushings or wiping sleeves... -
Page 11: Section 4: Inspection And Testing
Document 2.4.128, Revision 3 Network Transformer Instruction Manual October, 2017 BEFORE AND AFTER INITIAL ERGIZATION SECTION 4: INSPECTION AND TESTING Pre-Energization Inspection and Tests DANGER After the transformer has been installed, but before it is energized, the following tests and checks should FAILURE TO FOLLOW THE INSTRUCTIONS BELOW be performed at a minimum to ensure that the WILL RESULT IN DEATH OR SERIOUS PERSONAL... -
Page 12: Tap Changer Setting
Fluid Levels refer to “Opening the Transformer Tank” for The transformer main tank and primary instructions. Contact the Howard Industries switch chamber are shipped from the factory Transformer Division prior to opening the with insulating fluid filled to the proper level, tank. -
Page 13: Post-Energization Inspection And Tests
Document 2.4.128, Revision 3 Network Transformer Instruction Manual October, 2017 Post-Energization Inspection and Tests 1. Verifying Correct Voltage After the transformer is energized, the following tests Before supplying voltage from the transformer and inspections should be performed. to the load, verify that the secondary voltage is correct. -
Page 14: Section 5: Operation Of Switching And Protective Devices
Document 2.4.128, Revision 3 October, 2017 Network Transformer Instruction Manual SECTION 5: OPERATION OF SWITCHING AND PROTECTIVE DEVICES The following operating instructions and descriptions WARNING of switching and protective devices are intended to be a general guide for operation of Howard secondary network transformers in normal environments. -
Page 15: Tap Changer
Document 2.4.128, Revision 3 Network Transformer Instruction Manual October, 2017 Tap Changer Unless otherwise specified, transformers supplied The de-energized (no-load) tap changer may be used with tap changers will be shipped from the factory to adjust the voltage ratio of a transformer while it with the switch set to the nominal position. -
Page 16: Primary Disconnect And Grounding Switch Computer Support
CLOSED position. of the switch according to the parameters listed Contact the Howard Industries Transformer Division in Table 1 below. The interlock system requires to inquire about other switch configurations and a source of power that is independent of the options that may be available. -
Page 17: Sequential Grounding Provisions
Table 2 below; however, Other Switching and Protective Devices other user-specified switch characteristics are Contact the Howard Industries Transformer Division available. Markings on the switch handle indicate for information related to any other switching switch position. The switch may be operated in either or protection options not discussed in these a clockwise or counterclockwise direction. -
Page 18: Section 6: Accessories
Document 2.4.128, Revision 3 October, 2017 Network Transformer Instruction Manual SECTION 6: ACCESSORIES Fluid Temperature Gauge Some of the accessory devices described below are The fluid temperature gauge is a dial-type bi-metal optional and may not be present in any particular device that indicates the fluid temperature at transformer design. -
Page 19: Air Test Provision
Document 2.4.128, Revision 3 Network Transformer Instruction Manual October, 2017 Air Test Provision Primary Entrance The primary entrance is located on the top of the The air test provision is located on the primary switch terminal chamber and is provided for connection to chamber above the 85°C fluid level. -
Page 20: Secondary Bushings
Document 2.4.128, Revision 3 October, 2017 Network Transformer Instruction Manual Secondary Bushings Three externally-removable secondary bushings are bolted to the main tank wall inside the secondary throat. Each is fitted with a flexible connector for connection to a network protector. The low-voltage neutral connection consists of a blade welded to the main tank or, when specified by the user, a fully- insulated bushing. -
Page 21: Section 7: Maintenance
Document 2.4.128, Revision 3 Network Transformer Instruction Manual October, 2017 SECTION 7: MAINTENANCE Inspection and Maintenance Checklist While observing safe working practices, perform the WARNING following checks. 1. Inspect for dents or other damage to metal FAILURE TO FOLLOW THE INSTRUCTIONS surfaces and make the necessary repairs BELOW COULD RESULT IN DEATH OR 2. -
Page 22: Electrical Testing
Document 2.4.128, Revision 3 October, 2017 Network Transformer Instruction Manual 8. Check all fasteners for signs of corrosion and Electrical Testing The following electrical tests should be used to replace as necessary. determine the condition of the transformer. Follow 9. Check fluid temperature gauges, including the the instructions and precautions provided by the maximum temperature drag hand (if present) test equipment manufacturer. -
Page 23: Exterior Paint Finish
Pin-hole and weld seam leaks can the damaged area. Touch-up paint is available in usually be repaired by welding on a de-energized aerosol cans from the Howard Industries Transformer transformer. Division. Bushing leaks can sometimes be corrected by Fluid Leaks tightening the bushing clamp bolts. -
Page 24: Other Accessory Devices
Document 2.4.128, Revision 3 October, 2017 Network Transformer Instruction Manual Other Accessory Devices been contaminated by different types of fluids. Hoses must be designed for handling Other accessories devices, such as a gauges and the particular fluid in the transformer (As an valves typically require no maintenance except for example, rubber hoses should not be used replacement in the event of malfunction or damage. -
Page 25: Opening The Transformer Tank
Document 2.4.128, Revision 3 Network Transformer Instruction Manual October, 2017 water and other possible contaminants before from dropping into the core/coil assembly. proceeding with the filling process The following procedure should be used to remove the bolted hand-hole cover. 2. Pump from the bottom of the storage container. To prevent bubbles in the fluid, do not allow air to 1. -
Page 26: Table 3: Torque Guidelines For External Cabinet Fasteners
Network Transformer Instruction Manual tank-mounted components are over tightened. Check hardware may cause the component to crack or with the Howard Industries Transformer Division the gasket to become over-compressed. for recommended torque values for any devices or connections not listed below. Use manufacturer’s... -
Page 27: Additional Maintenance Instructions
Fluid type and volume can be determined by referring to the transformer Ground connector 140-180 nameplate. Contact Howard Industries to obtain the appropriate fluid Safety Data Sheet (SDS). The SDS ¹ When checking tightness of gasketed components, the measured... - Page 28 Document 2.4.128, Revision 3 October, 2017 Network Transformer Instruction Manual HI-110 Instructions for Installation, Operation and Maintenance of Secondary Network Transformers Document 2.4.128, Revision 3, October, 2017 Copyright © 2017, Howard Industries, Inc. Laurel, Mississippi Telephone: 601-425-3151 Fax: 601-649-8090 Email: mkt@howard.com Web: howardtransformers.com...
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