IEEE C37.108 1989

$30.88

IEEE Guide for the Protection of Network Transformers

Published By	Publication Date	Number of Pages
IEEE	1989	33

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Description

New IEEE Standard – Inactive – Superseded. This IEEE Standards product is part of the C37 family on Switchgear, Substations and Protective Relays. This guide is intended to aid those engineers who have reevaluated the risks associated with faults within network vaults, particularly for those network vaults located within or near highrise buildings. It will also identify currently available devices that are being used in network transformer protection schemes. These devices should act to sense the fault and initiate fault interruption locally or remotely, thereby minimizing damage and restoration time. These devices will be described as to their fault detecting capabilities. An example utilizing a number of protective schemes is presented in Appendix B.

PDF Catalog

PDF Pages	PDF Title
1	Title Page
3	Introduction Participants
6	CONTENTS
7	1. Introduction 1.1 Scope 1.2 References
8	2. General Background
9	2.1 Network Development 2.2 Application Considerations of Adding Protection to Spot Network Vaults versus Grid Network Vaults
10	3. Operation of a Network Transformer Vault Under Fault Conditions 3.1 Primary Feeder Faults
11	3.2 Network Equipment Faults
14	4. Methods Available to Provide Improved Network Transformer Protection 4.1 Electrical Detection of Faults
16	4.2 Mechanical Detection of Faults
17	4.3 Thermal Detection of Faults 4.4 Untraviolet Detectors
18	5. High-Voltage Fault Interrupting Devices 5.1 Circuit Breakers 5.2 Remotely Located Circuit Breakers with Transfer Tripping 5.3 Fault Interrupters
19	5.4 Power Fuses and Current-Limiting Fuses
20	6. Low-Voltage Fault Interrupting Devices 6.1 Network Protector 6.2 Low-Voltage Fuses
21	7. Bibliography
23	Annex A—Response of Network Relays to System Faults
26	Annex B—Example: 12.5 kV/277Y/480 V Spot Vault Network Transformer Protection
32	Annex C—Other Concepts Being Investigated