Revision Standard – Active. Guidance for the application of ac high-voltage circuit breakers switching capacitive currents is provided. The general theory of capacitive current switching and the notions of restrike, reignition, and nonsustained disruptive discharge (NSDD) are addressed in the application guide. Voltage factors used for single-phase testing as a substitute for three-phase testing are explained. The application of circuit breakers for different network conditions and different capacitive loads (capacitor banks, cables, transmission lines, and filter banks) is discussed.

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PDF Pages	PDF Title
1	IEEE Std C37.012™-2022 Front Cover
4	Important Notices and Disclaimers Concerning IEEE Standards Documents
8	Participants
10	Introduction
11	Contents
13	1. Overview 1.1 Scope 1.2 Purpose 1.3 Overview/roadmap 1.4 Word usage
14	2. Normative references 3. Definitions
16	4. General
18	5. Capacitive current switching application considerations 5.1 General 5.2 Maximum voltage for application 5.3 Frequency 5.4 Rated capacitive current
19	5.5 Voltage and power system grounding arrangement 5.6 Restrike probability
20	5.7 Restrike probability class of circuit breaker
21	5.8 Interrupting time 5.9 Transient overvoltages and overvoltage limitation
23	5.10 Inrush and outrush currents
24	6. Capacitor bank switching 6.1 General
25	6.2 De-energizing capacitor banks
30	6.3 Energizing capacitor banks
36	6.4 Capacitor bank application considerations
44	7. Unloaded cable switching 7.1 General
45	7.2 De-energizing unloaded cables
47	7.3 Energizing unloaded cables
52	7.4 Insulated cables
53	8. Unloaded line switching 8.1 General 8.2 Considerations about line charging currents
54	8.3 Considerations about recovery voltage of unloaded transmission lines
55	8.4 De-energizing uncompensated transmission lines
58	8.5 De-energizing compensated transmission lines
60	8.6 Energizing and reenergizing transmission lines
68	9. Voltage factors for capacitive current switching tests
70	10. Other capacitive current switching application considerations 10.1 Switching through transformers
71	10.2 “Hidden” circuits
74	10.3 Effect of load 10.4 Effect of reclosing
75	10.5 Resistor thermal limitations 10.6 Application considerations for different circuit breaker types
77	11. Considerations of capacitive currents and recovery voltages under fault conditions 11.1 Voltage and current factors
78	11.2 Reasons for these specific tests being nonmandatory in the standard 11.3 Contribution of a capacitor bank to a fault
79	11.4 Switching transmission lines under faulted conditions
80	11.5 Switching capacitor banks under faulted conditions
82	11.6 Switching cables under faulted conditions 11.7 Examples of application alternatives
83	Annex A (informative) Bibliography
85	Annex B (informative) Derivation of standard values B.1 Voltage factors
86	B.2 Why standards do not require testing under fault conditions B.3 Reason for the test recovery voltage being maintained for 0.3 seconds
87	Annex C (informative)Document roadmap and general guidance C.1 Purpose C.2 Nature of the capacitive load to be switched
88	C.3 Consequences of capacitive load switching
89	C.4 Mitigation of undesired consequences of capacitive current switching C.5 Cautionary notes
90	Back Cover

Published By	Publication Date	Number of Pages
IEEE	2022


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Standard Title	IEEE Guide for the Application of Capacitive Current Switching for AC High-Voltage Circuit Breakers Above 1000 V (Published)
Published Code	IEEE
Publication Date	2022

IEEE C37.012-2022

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