IEEE DRAFT C57.12.20 : D10C 2004
Withdrawn
A Withdrawn Standard is one, which is removed from sale, and its unique number can no longer be used. The Standard can be withdrawn and not replaced, or it can be withdrawn and replaced by a Standard with a different number.
OVERHEAD TYPE DISTRIBUTION TRANSFORMERS, 500 KVA AND SMALLER: HIGH VOLTAGE, 34 500 VOLTS AND BELOW; LOW VOLTAGE, 7970/13 800Y VOLTS AND BELOW
17-10-2023
12-01-2013
Introduction
1 Overview
1.1 Scope
1.2 Purpose
2 References
3 Definitions
3.1 A Fault
3.2 A Test
3.3 Back-Up Protection
3.4 Enclosures
3.5 Internal Fusible Element
4 Ratings
4.1 Kilovolt-Ampere Ratings
4.2 Voltage Ratings and Tap Ratings
5 Basic Lightning Impulse Insulation Levels and Dielectric
Test Levels
5.1 Basic Lightning Impulse
5.2 Dielectric Test
6 Tests
6.1 General
6.2 Dielectric Tests
7 Construction
7.1 Bushings and Terminals
7.1.1 Bushings
7.1.2 Terminals
7.1.3 Neutral Termination
7.1.4 Terminal Boards
7.2 Accessory Equipment
7.2.1 Tap Changer
7.2.2 Series-Multiple Connections
7.2.3 Liquid-Level Marking
7.2.4 Lifting Lugs
7.2.5 Relief of Excessive Pressure
7.2.6 Enclosure Integrity
7.3 Polarity, Terminal Markings, and Angular Displacement
7.3.1 Polarity
7.3.2 Angular Displacement
7.3.3 Terminal Markings
7.3.4 Instruction Nameplate
7.3.5 Kilovolt-Ampere Rating on Tank
7.3.6 Connections for Shipment by the Manufacturer
7.4 Oil Preservation
7.5 Tanks
7.5.1 Covers and Handholes
7.5.2 Support Lugs
7.5.3 Tank Finish
7.5.4 Tank Grounding Provisions
8 Storage and Installation
8.1 Storage
8.2 Installation
9 Design Tests for Fault Current Capability of Overhead
Distribution Transformer Enclosures
9.1 Objective
9.2 General Requirements
9.3 Tests
9.4 Test Number 1- An Arcing Fault in an Enclosure
9.4.1 First Fault
9.4.2 Second Fault
9.5 Test Number 2- For Enclosures with Internal Fusible Elements
9.5.1 "A" Fault
9.5.2 "B" Fault
9.6 Test Results
Tables
Figures
Annex A (informative) Auxiliary Mounting Devices
Figure A.1 Support Lug C
Figure A.2 Type C Adapter Plates
Figure A.3 T-Crossarm Hangers and Kickers (T1 and K1)
Figure A.4 T-Crossarm Hangers and Kickers (T2 and K2)
Figure A.5 Crossarm Hangers
Annex B (informative) Bibliography
Describes certain electrical, dimensional, and mechanical characteristics and safety features of single and three phase, 60-Hz, mineral oil immersed, self-cooled, overhead type distribution transformers 500 kVA and smaller, High Voltages 34 500 volts and below and Low Voltages 7970/13 800Y volts and below.
| DocumentType |
Draft
|
| PublisherName |
Institute of Electrical & Electronics Engineers
|
| Status |
Withdrawn
|
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| IEEE C57.12.31-2010 | IEEE Standard for Pole-Mounted Equipment--Enclosure Integrity |
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| MIL-STD-209 Revision K:2005 | LIFTING AND TIEDOWN PROVISIONS |
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