Learn to read and analyze the control circuits of MV gas insulated switchgear (GIS)


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Tripping, separator, ground switch … Previously, an introductory portion of GIS and its components was discussed to pave the way for GIS control circuits. Moreover, the single-line graph example of double bus and single breaker illustrates several concepts of GIS only. Control circuits are difficult to understand and understand due to the interrelated components and functions that impose additional meshing diagrams and control functions. Learn how to read and analyze MV GIS control circuits and then briefly describe the drawing tips and sketch examples before delving into the actual article topics (Control Circuits). Generally, control circuits are categorized into: secondary AC and DC auxiliary circuits (close / trip) for CB switches, disconnectors, ground switches, SCADA signal and alarm circuits, alarm circuits, equipment coil contacts arrangements, and secondary AC component details (CT & PT) The group shares similar concepts with medium voltage switchgear circuits in previous articles, so they were mentioned briefly. The second group includes several circuits – a breaker shutdown circuit, a breaker disconnect circuit, and a ground switch disconnect / close / open circuit. The circuit breaker closing circuit requires many conditions to be met before closing, and as a result, it is expected to have a complex circuit as we tested in the previous article, however, the disconnect / close / open circuits of the disconnect / ground switch are not less complicated as they will be revealed at the end This article. The trip circuit, alarm and signal circuits are also considered. If you have not read the first article, we encourage you to do so as it is a precondition for this article. Of course, a couple of articles of MV switchgear should be covered first to make it easier to understand. You can think of it as a series of articles dealing with medium voltage switchgear and then moving to GIS, so the difficulty level increases steadily. However, once mastered, it becomes an invaluable tool for your practical experience of design, maintenance, and troubleshooting. Table of contents: circuit breaker disconnecting circuit, disconnecting switch / ground switch, control circuit, circuit, double actuation circuit, protection control unit (BCPU), alarm circuit, gas pressure alarm circuit indicator SF6 alarm switch alarm circuit opening control protection circuit (BCPU) Secondary AC Circuits Summary 1. Circuit breaker disconnecting circuit In the previous article, there was a general close command that had to be pressed with the breaker select button to close the breaker in emergency mode so that any accidental activation of the switch selector would not cause the breaker to close. The same philosophy is implemented in the trip circuit, and this is shown in Figure 1, where the pushbutton S1 represents the tripping breaker in emergency mode and the K302 is the conductor that is energized when the general trip command button is pressed. This is identical to what was seen in the lockout circuit. Thus, the K12 coil circuit is completed so that its conductor in which the DC source reaches the trip coil (Y2) is closed, and again, the SF6 condition plays a major role in the trip circuit as well. Premium membership. Get access to all premium HV / MV / LV technical articles, electrical engineering guides, and papers. Check the benefits of each plan and choose the membership plan that’s best for you or your organization. You can choose the Plus, Pro, or Enterprise membership plan on a yearly basis. – Get 15% off Pro plan, use discount code: ZX21FLog InSign Up


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