IEEE C57.12.200-2022

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IEEE Guide for the Dielectric Frequency Response Measurement of Bushings (Published)

Published By	Publication Date	Number of Pages
IEEE	2022	84

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Description

New IEEE Standard – Active. Bushings are critical components for power apparatus as their main role is to conduct current at high voltage through a grounded barrier. Statistical studies have shown that bushing defects such as water ingression and partial discharge are among the most important causes for unexpected failures. Dielectric frequency response (DFR), sometimes also known as frequency domain spectroscopy (FDS), which involves measurement of the bushing capacitance and dielectric losses over a frequency range, is an effective method to detect deterioration of bushing insulation. This guide applies to the DFR measurement of various types of bushings either in the field or in the factory except for gas-insulated bushings.

PDF Catalog

PDF Pages	PDF Title
1	IEEE Std C57.12.200™-2022 Front cover
2	Title page
4	Important Notices and Disclaimers Concerning IEEE Standards Documents
8	Participants
10	Introduction
11	Contents
12	List of Figures
15	List of Tables
16	1. Overview 1.1 Scope 1.2 Purpose 1.3 Word usage
17	2. Normative references 3. Definitions, acronyms, and abbreviations 3.1 Definitions
18	3.2 Acronyms and abbreviations
19	4. Principle and application of the DFR measurement 4.1 Overview 4.2 Use of DFR
21	4.3 Differences between DFR and single-frequency PF testing techniques 4.4 DFR measurement on bushings
22	5. Safety recommendations 5.1 General safety instructions
23	5.2 Test safety
24	6. Best practices for DFR testing 6.1 Test object 6.2 Measuring instrument
25	6.3 Test setup 7. Test connection 7.1 Test mode
27	7.2 Connection from instrument to bushing
30	8. DFR results analysis
31	8.1 Time-based comparison 8.2 Type-based comparison
32	8.3 Phase-based comparison 8.4 Model-based analysis
33	8.5 Causes of abnormal DFR results
34	Annex A (informative) Theoretical basis for dielectric measurement
36	Annex B (informative) Temperature correction of DFR measurements using Arrhenius equation
41	Annex C (informative) Impact of stray currents on bushing surface
44	Annex D (informative) Impact of test voltage on DFR results D.1 DFR measurements in the factory D.2 DFR measurements in the field
54	Annex E (informative) Case studies irrelevant to moisture ingress E.1 500 kV high-voltage power transformer bushings
59	E.2 500 kV high-voltage power transformer bushings
63	E.3 110 kV high-voltage power transformer bushings
67	E.4 500 kV high-voltage power transformer bushings for in one substation
72	Annex F (informative) Case studies relevant to moisture ingress F.1 110 kV high-voltage power transformer bushings
76	F.2 500 kV high-voltage power transformer bushing in a substation
80	Annex G (informative) OIP bushings investigated by both DGA and DFR methods
83	Annex H (informative) Bibliography
84	Back cover