Answers to Commonly-Asked Questions About the Mark VI Circuit-Switcher.

Capacitor banks are an important source of voltage support during peak periods when the demand for electricity is high. Effective capacitor bank switching and protection requires a reliable capacitor switch. This device must assure the availability of the capacitor bank when needed, and it must be able to function reliably several times a day.

Mark VI Circuit-Switcher is tailor-made for capacitor-bank switching and protection. Following are questions and answers concerning the use of Mark VI Circuit-Switcher for capacitor bank switching applications.

Can Mark VI Circuit-Switchers be applied with pre-insertion inductors?

Yes. Mark VI Circuit-Switchers are especially designed for use with pre-insertion inductors. Check out the March article, “Learn How Pre-Insertion Inductors Solve an Array of Power Quality Problems Associated with the Switching of Substation Capacitor Banks” for details.

Can Mark VI Circuit-Switchers be used in 34.5 and 46-kV applications?

Yes, a 69-kV model can be used.

On what size capacitor banks can Mark VI Circuit-Switchers be used?

Mark VI Circuit-Switchers can be applied on grounded and ungrounded 69-kV capacitor banks up to 50 MVAR, grounded and ungrounded 115-kV banks up through 83 MVAR, and grounded 138-kV banks up through 100 MVAR.

If applied with pre-insertion inductors, Mark VI Circuit-Switchers can be applied on grounded and ungrounded 69-kV capacitor banks up to 42 MVAR, grounded and ungrounded 115-kV banks up through 60 MVAR, and grounded 138-kV banks up through 75 MVAR.

Can Mark VI Circuit-Switchers be furnished with current transformers?

Optional free-standing CTs can be mounted on brackets attached directly to the Circuit-Switcher’s pole-unit bases . . . eliminating the need for a separate structure for the CTs and minimizing real-estate requirements.

Can Mark VI Circuit-Switchers be applied on parallel (back-to-back) capacitor banks?

Yes. Contact your S&C Sales Representative for more information on using the Mark VI Circuit-Switcher on parallel banks.