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IEEE 2974-2025

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IEEE Guide for System Commissioning of Medium and Low (750 V to ±50 kV) Voltage Direct Current Distribution Network
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IEEE 2974-2025

IEEE Guide for System Commissioning of Medium and Low (750 V to ±50 kV) Voltage Direct Current Distribution Network

PUBLISH DATE 2026
PAGES 37
IEEE 2974-2025

New IEEE Standard - Active.

The test requirements for system commissioning, applicable to dc (direct current) distribution networks with voltage levels from 750 V to ±50 kV, are specified in this guide.

Included in the guide are the following aspects:

  • converter [ac (alternating current)/dc, dc/dc] test;
  • dc circuit breaker test;
  • test of active and passive network conversion;
  • test of the operation characteristics of low voltage dc islanded operation system;
  • test of feeder power balance system;
  • coordinated operation test of medium and low voltage dc system;
  • plug and play system test;
  • small power system test;
  • large power system test;
  • rated load test;
  • overload test;
  • short circuit test;
  • and trial operation.

This guide specifies the test requirements of system commissioning which are applicable to the dc (direct current) distribution network of the voltage level from 750 V to ±50 kV.

The guide mainly includes the following aspects:

  • the converter (ac/dc, dc/dc) test;
  • the dc circuit breaker test;
  • the test of active and passive network conversion;
  • the test of the operation characteristics of low voltage dc islanded operation system;
  • the test of feeder power balance system;
  • the coordinated operation test of medium and low voltage dc system;
  • the plug and play system test;
  • the small power system test;
  • the large power system test;
  • the rated load test;
  • the overload test;
  • the short circuit test; and
  • the trial operation.

The purpose of this document is to specify the condition, general requirements, test foundation, content, and methods that are applied in a medium and low voltage dc distribution network project during system commissioning.

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