Radisys PIC-3-3300数字量输入卡件

产品详细资料
1000/1的CT比率与250/1的比率并不完美匹配。高侧CT产生262.5/250=1.05A的二次电流，而低侧CT产生0.837A的电流。745自动将振幅校正因子应用于绕组2电流，以使其与绕组1电流相匹配。以下说明了如何计算校正系数：（EQ 7.5）因此，失配系数为：（EQ7.6）将绕组2的电流除以该系数，以获得差分元件的平衡条件。如果该变压器在线，满载，并由适当设置的745继电器保护，继电器读取的实际电流值为：•绕组1:262.5 A∠0°（这是参考绕组）•绕组2:836.8 A∠210°（变压器滞后30°，CT连接滞后180°）•差动电流：<0.03×CT，因为一旦继电器内部正确转换，两个绕组电流相等。•每个绕组的负载应为额定负载的100%。上述结果可以用两个可调节的三相电流源进行验证。对于单个电流源，必须考虑继电器如何执行必要的相位角校正。表5-1:第5-13页的变压器类型显示，Y侧电流偏移30°，以匹配德尔塔二次侧。30°相移由以下方程获得：仅出于微分元件的目的，对于所描述的注入条件，变换已将电流降低到A相的原始值的0.57倍，并在B相产生表观电流。如果现在将1×CT注入绕组1的a相，则应获得所有三相的差动电流的以下值：a相差动：0.57×CT∠0°滞后B相差动：0.5 7×CT≠180°滞后C相：0×CT。
The 1000/1 CT ratio is not a perfect match for the 250/1 ratio. The high-side CT produces a secondary current of 262.5/250 = 1.05 A whereas the low-side CT produces a current of 0.837 A. The 745 automatically applies an amplitude correction factor to the Winding 2 currents to match them to the Winding 1 currents. The following illustrates how the correction factor is computed: (EQ 7.5) The mismatch factor is therefore: (EQ 7.6) Winding 2 currents are divided by this factor to obtain balanced conditions for the differential elements. If this transformer were on line, fully loaded, and protected by a properly set 745 relay, the actual current values read by the relay would be: • Winding 1: 262.5 A ∠0° (this is the reference winding) • Winding 2: 836.8 A ∠210° (30° lag due to transformer and 180° lag due to CT connections) • Differential current: < 0.03 × CT as the two winding currents are equal once correctly transformed inside the relay. • The loading of each winding would be 100% of rated. The above results can be verified with two adjustable sources of three-phase current. With a single current source, how the relay performs the necessary phase angle corrections must be taken into account. Table 5–1: Transformer types on page 5–13 shows that the Yside currents are shifted by 30° to match the Delta secondary side. The 30° phase shift is obtained from the equations below:For the purposes of the differential elements only, the transformation has reduced the current to 0.57 times its original value into Phase A, and created an apparent current into Phase B, for the described injection condition. If a 1 × CT is now injected into Winding 1 Phase A, the following values for the differential currents for all three phases should be obtained: Phase A differential: 0.57 × CT ∠0° Lag Phase B differential: 0.57 × CT ∠180° Lag Phase C: 0 × CT.
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应用于品牌本系列工业以及生产生活自动化设备产品。

Used in the brand of this series of industriaand production automation eauipment products

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