变压器局部放电特高频传感器的研究与应用王伟杰，雍明超，何星躲，郭旭，姜睿智，刘洋（许继集团有限公司，河南许昌461000）摘要：针对目前变压器局放传感器灵敏度低、频带窄等问题，采用平面等角螺旋天线设计特高频传感器，采用直线代替指数渐变巴伦，仿真验证螺旋内径、巴伦宽度和高度对天线性能的影响，表明随着平面等角螺旋天线的螺旋内径r0的增加，回波损耗在低频段波动性逐渐变强，频带宽度降低；巴伦端宽度w1对天线回波损耗低频段的稳定性和频带宽度的影响也十分明显；巴伦高度h则主要会影响天线回波损耗高频段的性能，随着巴伦高度的增加，回波损耗呈现先增加后减小的趋势。基于天线仿真优化尺寸，研制了基于法兰安装的变压器局放特高频传感器，利用变压器局部放电模拟系统进行实测，回波损耗S11小于10dB带宽为0.38~3GHz，增益可达3.64dB。结果表明传感器抗干扰能力强，天线性能良好，可用于变压器局部放电在线检测及故障诊断。关键词：局部放电；等角螺旋天线；微带巴伦；特高频传感器ResearchandApplicationofUHFSensorforPartialDischargeDetectionofTransformerWANGWeijie，YONGMingchao，HEXingduo，GUOXu，JIANGRuizhi，LIUYang（XuJiGroupCo.，Ltd.，HenanXuchang461000，China）Abstract:Inviewofsuchproblemsaslowsensitivityandnarrowfrequencybandofpartialdischargesensorofthepresenttransformer，theUHFsensorisdesignedwithaplanarequiangularhelicalantenna，andastraightlineisusedinsteadofanexponentiallychangingbaluntosimulateandverifytheinfluenceofhelicalinnerdiameter，bal⁃unwidthandheightontheantennaperformance，indicatingthatwiththeincreaseofthehelicalinnerdiameterr0oftheplanarequiangularhelicalantenna，thefluctuationofthereturnlossinthelowfrequencybandbecomesstrongerandthefrequencybandwidthdecreases.Theinfluenceofthebalunendwidthw1onthestabilityandfrequencybandwidthoftheantennareturnlossinthelowfrequencybandisalsoveryobvious，andthebalunheighthmainlyaffectstheperformanceoftheantennareturnlossinthehighfrequencyband.Withtheincreaseofbalunheight，thereturnlossshowsatrendofincreasingfirstandthendecreasing.Basedontheoptimizedsizeofsimulationofthean⁃tenna，aflange⁃mountedtransformerPDUHFsensorisdeveloped.ThePDsimulationsystemofthetransformerisus...
