# Microgrid feeder energization readiness gate Canonical URL: https://eloragrid.ai/symbols/microgrid-feeder-energization-readiness-gate Publisher: Elora Grid Updated: 2026-11-03 Lookup label: MFERG Drawing use: Schematic Reference families: Manufacturer Representation: Functional block Installation focus: microgrids Input: Feeder status and permits Output: Feeder connection permission Checks the documented prerequisites before connecting the assigned feeder in a restoration stage. ## In plain English ### What this block does Checks the documented prerequisites before connecting the assigned feeder in a restoration stage. ### A simple example In a microgrid recovering from a blackout, an available grid-forming source can establish the assigned island reference before compatible generation and eligible load groups are introduced under the validated restoration strategy. For this reference, the drawing identifies “Feeder status and permits” at the input and “Feeder connection permission” at the output. A control permissive does not prove field isolation removed correctly. ### What the drawings help you do Start at the named input: Feeder status and permits. Identify its source device or document and the state represented on the drawing. Follow the named output: Feeder connection permission. Cross-reference its destination and separate the command from confirmation that the equipment responded. ### Terms - Input: Feeder status and permits - Output: Feeder connection permission - Application reference: An explanation of a named drawing function or circuit relationship; the project documents define the equipment and its connections. Concept diagram: Feeder status and permits → MFERG → Feeder connection permission A reading guide. The entry's original illustration and input/output facts describe this application. - [Avista Shared Energy Economy microgrid protection and control case study](https://selinc.com/api/download/135486/) ## What it represents Checks the documented prerequisites before connecting the assigned feeder in a restoration stage. Black-start and restoration control coordinates the establishment of an electrical reference and the gradual return of assigned resources and loads. A dead system, an available starting source and a successful load restoration are distinct states. In a microgrid recovering from a blackout, an available grid-forming source can establish the assigned island reference before compatible generation and eligible load groups are introduced under the validated restoration strategy. For this reference, the drawing identifies “Feeder status and permits” at the input and “Feeder connection permission” at the output. A control permissive does not prove field isolation removed correctly. Show the prerequisites and confirmation at each control boundary. These original explanatory blocks are not an operating procedure; energization, protection, transformer inrush and motor reacceleration require system-level validation. The functional block is an independent explanation of this named application. Equipment-specific ratings, terminal connections and operating conditions must be established in the project documentation. ## How to read it - Start at the named input: Feeder status and permits. Identify its source device or document and the state represented on the drawing. - Follow the named output: Feeder connection permission. Cross-reference its destination and separate the command from confirmation that the equipment responded. - A control permissive does not prove field isolation removed correctly. - Show the prerequisites and confirmation at each control boundary. These original explanatory blocks are not an operating procedure; energization, protection, transformer inrush and motor reacceleration require system-level validation. ## Information to show or reference - Label the source and connection reference for feeder status and permits. - Identify the destination and defined state of feeder connection permission. - Record the equipment or control-document revision supporting this functional block. - Check this application limit in the project design: A control permissive does not prove field isolation removed correctly. ## Important distinction A control permissive does not prove field isolation removed correctly. This reference describes the named application; it does not establish a new IEC graphical symbol, an ANSI device-function number or an exact manufacturer connection diagram. ## Facts - Representation: Functional block - Installation focus: Microgrids - Input / boundary: Feeder status and permits - Output / connection: Feeder connection permission - Lookup label: MFERG is a library lookup label, not a standard device designation. ## Public references - [Avista Shared Energy Economy microgrid protection and control case study](https://selinc.com/api/download/135486/) — SEL. Public technical context for microgrid black-start and restoration controls. Storage, protection, black start, load restoration and coordinated island operation. The application text and educational graphic are independently authored; the publisher does not certify this representation. ## Graphic scope Independent original educational concept illustration by Elora Grid. Not a certified standards graphic or manufacturer footprint. Unitless; not to scale. Original artwork licence: https://creativecommons.org/licenses/by/4.0/. Publisher material is linked only.