高电压设备测试（High Voltage Equipment Testing）（英文版）课件 Worksheet 11 Grounding Resistance Measurement of Ground Grid.pptx

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高电压设备测试（High Voltage Equipment Testing）（英文版）课件 Worksheet 11 Grounding Resistance Measurement of Ground Grid.pptx

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《HighVoltageEquipmentTesting》GroundingResistanceMeasurementofGroundGrid主讲人：何发武（副教授）

OperatingWorksheet：

TableofContents01Followme02Workshop03Training

01Followme

Ⅰ.OverviewofGroundingResistanceGroundingresistancereferstotheresistancevaluebetweenthegroundingelectrode,equipmentenclosure,orbuildinggroundingelectrodeandtheearth.Thesmallerthegroundingresistance,thebetteritcandivertleakagecurrentsorlightningsignalsintotheground,preventingpersonalandequipmentdamage.Groundingresistanceincludescontactresistancebetweenelectricalequipmentandgroundingwires,resistanceofgroundingwiresorgroundingbodiesthemselves,contactresistancebetweengroundingbodiesandtheearth,andresistanceoftheearth.

Ⅰ.OverviewofGroundingResistanceAtpresent,thegroundingresistanceofthegroundinggridismainlymeasuredbythepowerfrequencylargecurrentthree-polemethodinthepowersystem.Inordertopreventthepowerfrequencyinterferencegeneratedduringtheoperationofthepowergridandimprovetheaccuracyofthemeasurementresults,theinsulationpreventivetestprocedurestipulatesthatthetestcurrentofthepowerfrequencylargecurrentmethodshallnotbelessthan30?A.

Ⅰ.OverviewofGroundingResistanceThe50?Hzdataobtainedfrommeasurementsinstronginterferenceenvironmentsofsubstationsareparticularlysuitableforenvironmentswithlargefluctuationsinrailwaysubstationreturncurrent.Theanti-interferencegroundinggridgroundingresistancemeterisaspecializedinstrumentusedtomeasurethegroundingresistanceandconductivityofagroundinggridbetweengroundingpoints.Itiscapableofmeasuringbothgroundingimpedanceandresistancesimultaneously,providinganaccuratereflectionofthegroundinggrid’sactualcharacteristics.

Ⅱ.PrinciplesofGroundingResistanceMeasurementGroundingresistancereferstotheresistancedisplayedwhenreleasingcurr

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高电压设备测试（High Voltage Equipment Testing）（英文版）课件 Worksheet 11 Grounding Resistance Measurement of Ground Grid.pptx