| 绝缘垫块异常老化的原因分析 |
| 添加时间：2018/8/11 15:17:44 浏览次数： |
| 绝缘垫块异常老化的原因分析 Analysis of abnormal aging of insulating 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 cushion of a dry-type series reactor, it is found that the insulation cushion block will cause the temperature rise of the winding on the high side and the abnormal aging of the insulation cushion block. 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 a common specification of power grid company. The type test noise is qualified. After commissioning, it has been tested once. The sound pressure level is 57.8dB, which is 2.8dB higher than the standard (55dB). Because the reactor noise stipulated in the standard is laboratory data, there are great differences in current waveform, environmental interference and other actual working conditions between the laboratory and the laboratory. When the operator discovers the abnormal noise, the measured noise of the product reaches 71.1 dB, which is higher than the usual 3 dB or so, and has exceeded the standard seriously. It shows that the reactor internal structure may be loosened, 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 is well insulated to the ground, and the DC resistance of the winding is still within the qualified range. The results of power frequency withstand voltage test show that both B and C phases have obvious corona discharge sound, while A phase is not obvious, which indicates that B and C phase windings are not perfect for core insulation, and the insulation distance may have 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 looseness of the product structure and check the radial orientation of the winding, it is found that the A, B and C three-phase windings all have displacement, the B, C phase reaches 6mm and the A phase shifts 3mm. Combined with the power frequency voltage withstanding analysis, the looseness of the B and C phase windings can be judged to be serious. |
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