PC37.68 - Standard Design, Test, and Application Requirements for Microprocessor-Based Controls of Distribution Padmount, Dry Vault, Wet Vault, and Polemount Switchgear Rated Above 1 kV and Up to and Including 38 kV
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This standard presents basic requirements for the design, testing and application of microprocessor-based controls of distribution switchgear rated above 1 kV up to and including 38 kV. The standard is intended to mitigate the effects of the harsh environments which may be encountered outside the protections provided by a typical substation. This standard applies to microprocessor-based devices employed in distribution switchgear typically mounted on power poles, in wet or dry vaults, or in pad mounted switchgear enclosures. This standard also does not apply to microprocessor-based devices employed in high voltage circuit breakers (IEEE C37.04 "Standard Rating Structure for AC High-Voltage Circuit Breakers") or metal-enclosed switchgear (IEEE C37.20.2 "Standard Metal-Clad Switchgear" and IEEE C37.20.3 "Standard for Metal-Enclosed Interrupter Switchgear"). This standard does not invalidate any tests performed on power system protective relays which are designed to IEEE C37.90 ("Standard for Relays and Relay Systems Associated with Electric Power Apparatus"). Lastly, this standard will not cover the design of the control enclosure such as mounting, latching, or user accessibility.
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