| 绝缘垫块异常老化的原因分析 |
| 添加时间：2018/5/3 14:27:22 浏览次数： |
| 绝缘垫块异常老化的原因分析 Analysis on the causes of abnormal aging of insulation pad 通过一起干式铁心串联电抗器绝缘垫块异常老化的分析，发现了绝缘垫块堵塞绕组散热气道时受影响面积虽不大，但会引起绕组温升偏高，造成绝缘垫块异常老化。 Through the analysis of the abnormal aging of the insulation pad of a dry core series reactor, it is found that the affected area of the insulation cushion block is not large, but it will cause the temperature rise of the winding and the abnormal aging of the insulation pad. 试验分析 Test analysis 电抗器故障后，提取了噪声等实测数据，并进行了现场分析。 该型号产品为电网公司常用规格，经型式试验噪声合格，投运后曾测试一次噪声，声压级57.8dB，比标准（55dB）高了2.8dB。 由于标准规定的电抗器噪声为试验室数据，在电流波形、环境干扰等方面实际工况和试验室有较大差异，现场稍高噪声也是认可的。 运行人员发现噪声异常时，测得产品噪声达到71.1dB，跟往常比已有3dB 左右升高，已严重超标。说明电抗器内部可能发生结构松动，并可能影响了绝缘结构参数的稳定。 After the reactor fails, the measured data such as noise are extracted, and field analysis is carried out. This type of product is the usual specification of Power Grid Corp. It is qualified by type test noise. It has been tested once noise, sound pressure level 57.8dB, and 2.8dB higher than standard (55dB). Due to the noise of the standard reactor as the test room data, the actual conditions of the current waveform and environmental interference are quite different from the test room, and the high noise in the field is also recognized. When the operator found abnormal noise, the noise of the product was 71.1dB, which was higher than usual 3dB. It shows that structural loosening may occur inside reactor and may affect the stability of insulation structure parameters. 对该电抗器进行绝缘试验、绕组直流电阻测试和工频耐压等试验。测试结果表明，铁心对地绝缘良好，绕组直流电阻和出厂值对比仍在合格范围内。工频耐压试验结果显示，施加28kV 电压时，B、C相均有明显电晕放电声，A相则不明显，说明B、C相绕组对铁心绝缘已不完好，绝缘距离可能已发生改变。 The insulation test, winding DC resistance test and power frequency withstand voltage test of the reactor are carried out. The test results show that the core insulation is good, and the DC resistance of the winding is still within the qualified range compared with the factory value. The test results of frequency resistance test show that when the 28kV voltage is applied, the B and C phase have obvious corona discharge sound, and the A phase is not obvious. It shows that the insulation of B and C phase winding is not good for the core insulation, and the insulation distance may have been changed. 为进一步查找产品结构松动情况，检查绕组辐向定位，发现A、B、C三相绕组均发生位移，B、C相达到6mm，A相位移为3mm，结合工频耐压分析可以判断B、C相绕组压紧结构松动已较严重。 In order to find out the loosening of the product structure and check the orientation of the winding direction, it is found that the A, B and C three-phase windings are all displaced, B, C phase reaches 6mm, A phase moves to 3mm, and the tension structure of B and C phase winding can be judged to be more serious by combining the frequency resistance analysis of the industrial frequency. |
| 上一页 绝缘接头构造和原理 |
| 下一页 高压支柱绝缘子结构特点 |
Copyright © 技术支持：遨游网络