Differences In Testing Methods Between Insulation Resistance Tester And Ground Resistance Tester
(1) Test Method Of Insulation Resistance Tester
Insulation Resistance Tester Is To Test The Degree Of Insulation Between Phases, Layers And Neutral Points Of Wires And Cables. The Higher The Test Value, The Better The Insulation Performance. The Insulation Resistance Can Be Measured By UMG2672 Electronic Megohmmeter.
(2) Test Method Of Grounding Resistance Tester
The Grounding Resistance Tester Is A Power Equipment That Detects Whether The Grounding Resistance Is Qualified. The Test Method Of The Grounding Resistance Tester Is That The Electrical Equipment Is Connected To The Same Potential By The Earth, And It Is The Closeness Of The Reaction Wire Or The Lightning Down Conductor To The Earth. The Value Measured By The Grounding Resistance Tester Is An Effective Measure To Ensure Personal Safety. You Can Choose The DER2571 Digital Grounding Resistance Tester Produced By WeiA Power.
Fourth, The Principle Difference Between Insulation Resistance Tester And Ground Resistance Tester
(1) Principle Of Insulation Resistance Tester
When The Insulation Resistance Tester Is Used To Measure The Insulation Resistance, The DC Voltage U Is Applied To The Insulation. At This Time, A Current Changes Attenuation With Time, And Finally Tends To A Stable Value.
Generally, The Current Of An Insulation Resistance Tester Is The Sum Of Capacitance Current, Absorption Current And Conduction Current. Capacitive Current Ic, Its Attenuation Speed Is Very Fast; Absorption Current Iaδc, It Decays Much Slower Than Capacitive Current; Conduction Current Inp, It Tends To Stabilize In A Short Time.
During The Test Using The Insulation Resistance Tester, If The Insulation Is Not Damp And The Surface Is Clean, The Transient Current Components Ic And Iaδc Will Quickly Decay To Zero, Leaving Only A Small Conduction Current Inp To Pass, Because The Insulation Resistance Is Inversely Proportional To The Circulating Current , The Insulation Resistance Will Rise Quickly And Stabilize At A Large Value. Conversely, If The Insulation Is Damp, The Conduction Current Increases Significantly, Even Faster Than The Initial Value Of The Absorption Current Iaδc, The Transient Current Component Is Significantly Reduced, And The Insulation Resistance Value Is Very Low, And It Changes Greatly With Time. Micro.
Therefore, In The Experiment Of The Insulation Resistance Tester, The Moisture Content Of The Insulation Is Generally Judged By The Absorption Ratio. When The Absorption Ratio Is Greater Than 1.3, It Indicates That The Insulation Is Excellent. If The Absorption Ratio Is Close To 1, It Indicates That The Insulation Is Damp.
(2) Principle Of Grounding Resistance Tester
Grounding Resistance Tester Is Also Called Grounding Resistance Measuring Instrument, Grounding Shaker. The Test Principle Of The Ground Resistance Test Is To Obtain The Ground Resistance Value “Rx” Through The AC Constant Current “I” Between The Ground Electrode “E” And The Power Supply Electrode “H(C)” Of The Object Under Test, And The Grounding Is Found The Position Difference “V” Between The Electrode “E” And The Measuring Electrode “S(P)”.
Post time: Feb-06-2021
