Rozdzielnice średniego napięcia: Komponenty i dobór

Release Time: 2026-07-08

Wyraźny rozdzielnica średniego napięcia decyzja zaczyna się od zatwierdzonego projektu sieci, a nie od wyizolowanej specyfikacji katalogowej. Ten przewodnik utrzymuje fokus artykułu na pytaniach projektowych, które determinują wykonalny zakres, i kieruje węższe decyzje do powiązanych artykułów technicznych.

Part 1. Use the one-line diagram to define the duty

Medium-voltage switchgear is an assembly that switches, protects, isolates, and controls circuits above low-voltage distribution levels. Selection starts with the system voltage, earthing method, continuous current, prospective short-circuit current, feeder roles, and operating philosophy. A voltage label alone does not establish the required assembly duty.

Rozdzielnice średniego napięcia: Komponenty i dobór

Part 2. Understand the components as one coordinated system

Typical sections combine busbars, circuit breakers or load-break switches, disconnecting and earthing functions, instrument transformers, protection relays, cable compartments, and interlocks. Their ratings and clearances must be coordinated. The equipment schedule should state what is included in each incomer, feeder, bus section, and metering panel.

Part 3. Choose the insulation and construction for the installation

Air-insulated, gas-insulated, and metal-clad designs solve different footprint, environmental, and maintenance problems. Indoor rooms require attention to access, cable routing, ventilation, and safety clearances. Outdoor or compact installations add enclosure and environmental considerations. Confirm the actual construction in approved drawings rather than inferring it from a generic category name.

Project planning for medium voltage switchgear

Part 4. Separate protection design from hardware selection

Relays, CTs, VTs, breaker operating times, and the protection philosophy must be aligned with the network study. Protection settings are not universal values that can be copied between projects. Coordinate them with upstream utility equipment and downstream transformers or feeders before commissioning.

Part 5. Make factory and handover records part of procurement

Ask for approved GA drawings, wiring diagrams, nameplate information, routine-test records, relay documentation, and operation instructions. Factory tests should be witnessed or reviewed according to the contract. Site commissioning then verifies cable identification, interlocks, earthing, protection logic, and the latest settings file.

Part 6. Use the product page for initial scope alignment

For 12kV or 24kV project discussions, the published Rozdzielnica średniego napięcia KYN28-12 can provide a catalog starting point. Product recommendation boundary: fault duty, internal-arc requirements, relay scheme, and utility interfaces must be confirmed by project engineering.

Więcej szczegółowych informacji można znaleźć w KYN28 Gas Insulated Switchgear Buyer Guide i Przewodnik wyboru rozdzielnicy i 11kV Vacuum Circuit Breaker Selection. Przejrzyj szersze konteksty Kategoria Shenheng Power podczas porównywania rodzin katalogowych i przesyłania zatwierdzonych danych wejściowych projektu Skontaktuj się z Shenheng Power do dyskusji inżynierskiej.

Documentation review for medium voltage switchgear

Najczęściej zadawane pytania

What does medium voltage switchgear do?

It switches, protects, isolates, and controls medium-voltage circuits according to the system design.

What should be defined before requesting a quotation?

Provide voltage, current, fault duty, insulation level, feeder schedule, protection requirements, site conditions, and required documentation.

How are AIS and GIS selection decisions made?

Compare footprint, environment, maintenance approach, project standards, and the required electrical duty rather than choosing by label alone.

Why are interlocks important?

They support safe operating sequences, but the required interlock scheme must match the approved single-line diagram and operating procedure.

What documents are needed before commissioning?

Use the approved drawings, test records, relay settings, cable schedule, manuals, and commissioning procedure.

When should an RMU be considered instead of a larger lineup?

Use the network layout, feeder functions, protection needs, and site constraints to determine whether an RMU is appropriate.

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