China National Standards

China 121：Functional GB Standards List

  •  China "121：Functional" GB Standards List:
    • Standard  Code Standard Title Standard Class Order
    GB/T 14598.121-2017 Measuring relays and protection equipment—Part 121：Functional requirements for distance protection
    量度继电器和保护装置 第121部分：距离保护功能要求    		 China National Standards
    121：Functional
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