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联系人:赵礼春  先生 (商务部  经理)
手 机:18951262418
电 话:86-0517-86844418
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地 址:中国-江苏-淮安-江苏省金湖县金南幸福路
邮 编:211611
网 址:http://ccdlyxgs.machine365.com/General/
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YFFB扁电缆

  • 当 前 价:10.00元/米
  • 最小起订:100米
  • 供货总量:10000米
  • 发 货 期:10天内发货
  • 有效期至:2020年6月4日
  • 所 在 地: 江苏 淮安
  • 843499471

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联系我们

联系人:赵礼春  先生 (商务部  经理)
电 话:86-0517-86844418
手 机:18951262418
传 真:86--
地 址:中国-江苏-淮安-江苏省金湖县金南幸福路
邮 编:211611
网 址: http://ccdlyxgs.machine365.com/General/

江苏春晨电缆有限公司生产YFFB扁电缆,500kV某站新上3号主变投运,在空载投切变压器试验过程中,首次冲击,变压器差动保护动作,冲击不成功;后又进行第二次冲击,仍然不成功,差动保护动作。事后,我们收集现场资料,根据保护动作情况及故障波形对冲击不成功原因进行了分析,结果如下。
500kV a station new and up 3 main transformer operation, in the process of unload transformer test, the first impact, the transformer differential protection action, the impact is not successful, after another second shocks, still unsuccessful, differential protection action. Afterwards, we collected on-site information, and analyzed the reasons for the unsuccessful impact according to the protective action and fault waveform. The results are as follows.
从保护跳闸报告上看,两套不同原理制动的差动保护(波形制动和谐波制动)均动作出口。看故障波形(如图9),虽然冲击时的直流分量很大,三相波形偏向时间轴的一侧,但是三相电流都很大,波形平滑、连贯、无间断角,同正常变压器空载冲击时的波形(如图9)有所不同。同时,还可以发现在相位上,A、C两相几乎同相, B相与A、C两相反相(差180度)。
From the protection trip report, two sets of differential protection (wave braking and harmonic braking) with different principles are all exported. Look at the fault waveform (for example, figure 9), although the DC component of the impact is very large, the three-phase waveform is biased toward the side of the time axis, but the three-phase current is very large, the waveform is smooth, coherent, and there is no break angle, and the waveform of the normal transformer when the load is unloaded (Figure 9) is different. At the same time, it can be found that the A and C phases are almost the same phase, and the B phase is opposite to A and C (180 degrees).
B相低压侧绕组反接时的相量图如图所示,由于绕组接反,变压器△侧产生了不平衡电压Uk,由于绕组阻抗很小,继而产生了很大的环流Ik。供应YFFB扁电缆
The phasor diagram of the back winding of the B phase low voltage side winding shows that the unbalanced voltage Uk is produced by the transformer delta side due to the connection of the winding, and the winding impedance is very small, and a large circulation Ik is generated.
更改了变压器b相的一次接线组别,见图10,与相关二次绕组极性,该变压器一次送电成功。供应YFFB扁电缆
The primary wiring group of transformer B phase has been changed. See Figure 10, and the polarity of the two secondary windings. The transformer is successfully delivered at one time.

  • 品牌
    其他
  • 型号
    YFFB
  • 外形尺寸
    50
  • 适用范围
    卷筒扁电缆
  • 产品认证
    其他