专利详细信息

一种电功率测量方法及其测量装置

文献类型：专利

专利类型：发明专利

是否失效：否

是否授权：否

申请号：CN200610011474.1

申请日：20060310

发明人：刘民李亚琭

申请人：中国航天科技集团公司第五研究院第五一四研究所

申请人地址：100086 北京市海淀区北京9628信箱

公开日：20080716

公开号：CN100403036C

代理人：安丽

代理机构：11009 中国航天科技专利中心

语　　种：中文

摘　　要：一种测量电功率的方法，将视在功率与电压相量和电流相量的关系表示为见右下式(Ⅰ)或者见右下式(Ⅱ)；然后测量上述电压的有效值|U|或电流的有效值|I|，并计算其平方，即|U|<Sup>2</Sup>或|I|<Sup>2</Sup>；采用正交分解比例法，测量电流相量与电压相量的复相量比值|Y|(cosφ-jsinφ)，或测量电压相量与电流相量的复相量比值|Z|(cosφ+jsinφ)；最后，计算有效值平方与复相量比值的乘积，乘积的实部为有功功率P＝|U|<Sup>2</Sup>|Y|cosφ或P＝|I|<Sup>2</Sup>|Z|cosφ、虚部为无功功率Q＝|U|<Sup>2</Sup>|Y|sinφ或Q＝|I|<Sup>2</Sup>|Z|sinφ、复相量相位差为功率因数角见右下式(Ⅲ)；测量电功率的装置主要包括交流电压有效值测量装置、交流电压比例器、交流电流分流器、能测量复相量比值的正交分解比例器。本发明在10Hz～1MHz频率范围内可以溯源到交流电压有效值计量标准以及阻抗计量标准或交流电压比例计量标准上，最佳测量不确定度可以达到1×10<Sup>-4</Sup>。

主权项：1.一种测量电功率的方法，其特征在于步骤如下：(1)将视在功率与电压相量和电流相量的关系表示为 $<math><mrow> <mover> <mi>S</mi> <mo>·</mo> </mover> <mo>=</mo> <mover> <mi>U</mi> <mo>·</mo> </mover> <mo>·</mo> <mover> <mi>I</mi> <mo>*</mo> </mover> <mo>=</mo> <mfrac> <mover> <mi>U</mi> <mo>·</mo> </mover> <mover> <mi>I</mi> <mo>·</mo> </mover> </mfrac> <mo>·</mo> <mover> <mi>I</mi> <mo>·</mo> </mover> <mo>·</mo> <mover> <mi>I</mi> <mo>*</mo> </mover> <mo>=</mo> <mo>|</mo> <mi>Z</mi> <mo>|</mo> <msup> <mi>e</mi> <mi>jφ</mi> </msup> <mo>·</mo> <msup> <mrow> <mo>|</mo> <mi>I</mi> <mo>|</mo> </mrow> <mn>2</mn> </msup> <mo>=</mo> <mo>|</mo> <mi>Z</mi> <mo>|</mo> <mrow> <mo>(</mo> <mi>cos</mi> <mi>φ</mi> <mo>+</mo> <mi>j</mi> <mi>sin</mi> <mi>φ</mi> <mo>)</mo> </mrow> <msup> <mrow> <mo>|</mo> <mi>I</mi> <mo>|</mo> </mrow> <mn>2</mn> </msup> </mrow></math>$ 或者 $<math><mrow> <mover> <mi>S</mi> <mo>·</mo> </mover> <mo>=</mo> <mover> <mi>I</mi> <mo>·</mo> </move</p><p class='subject'><strong>关键词：</strong>复相量计量标准交流电压有效值测量电功率 <b class='type_ico_id'></b>电流相量电压比例 <b class='type_ico_id'></b>电压相量分解比例 <b class='type_ico_id'></b>有效值测量不确定度 <b class='type_ico_id'></b>功率因数角计算有效值测量电流测量电压测量装置关系表示交流电流频率范围无功功率分流器相位差实部阻抗 <b class='type_ico_id'></b>电流 <b class='type_ico_id'></b>电压溯源交流 </p><p class='class'><strong>IPC专利分类号：</strong>G01R21/06(20060101)</p>
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