This paper studies the negative sequence directional protection (NSDP) as the primary protection of series compensated UHV transmission line.

文中对带串补的特高压线路采用负序方向高频保护作为主保护方式进行了研究。

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Copyright and trade secrets have historically been the primary protection mechanisms for software intellectual property, and they are still the best solutions.

版权和商业秘密在历史上一直是软件知识产权的主要保护机制，它们仍然是最好的解决方案。

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It effectively avoids the action failure of the primary protection zones related to the measuring point which loses information, as well as the improper action of the backup protection zone.

这将有效地避免信息缺失测量点相关的主保护区拒动，从而后备保护区动作使其所包含的多个主保护区全部停电的情况。

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The U.S.Environmental Protection Agency,or EPA, lists stormwater as the primary cause of water pollution in the United States, and encourages local communities to develop management plans to treat run-off before it pollutes their rivers, lakes or streams.

VOA: standard.2010.08.04

Perhaps things will change now that regulators, state and federal, are reminded of their primary mission: the protection of investors.

FORBES: Early Warnings of Mutual Fund Illegalities (October 1, 2003 )

In either case, the force's primary role will be the protection of the British military trainers now working with the Sierra Leone army.

BBC: UK boosts Sierra Leone force

Initially, their primary purpose was to offer protection from attack.

BBC: News Magazine, Washington DC