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How to Distinguish and Select: Ground Resistance, Loop Resistance, and Insulation Resistance Testers?

2025-09-25

This is a common question in electrical testing.
Although the names of these three instruments sound similar, their purposes, test objects, and methods are completely different:

1.Ground Resistance Tester

What it measures:

The resistance between a grounding device and the earth.
Ensures that lightning current or fault current can be safely discharged into the ground.

Applications:

Substation grounding grids
Power equipment grounding systems
Lightning rod grounding
Building grounding systems

2.Loop Resistance Tester

What it measures:

The contact resistance of high-current circuits, such as switchgear, cable joints, and busbar connections (typically in the micro-ohm range).
Focuses on whether the contact points may overheat, ensuring reliable current transmission.

Applications:

Contact resistance of high-voltage circuit breakers
Busbar and cable joint testing
Electrical performance testing during factory inspection or maintenance of HV switchgear

3.Insulation Resistance Tester (commonly called “Vibrometer”)

What it measures:

The insulation resistance between electrical equipment and ground or between phases.
Evaluates the insulation condition to prevent leakage current or breakdown.

Applications:

Insulation testing of motors, transformers, and power cables
Control panels and wiring inspection
Household appliances insulation check

Key Differences

Tester	Test Object	Test Purpose	Resistance Range	Test Voltage/Current
Ground Resistance Tester	Grounding system – Earth	Check grounding reliability	Ohms to tens of ohms	Low-frequency current, auxiliary electrode method
Loop Resistance Tester	Contacts, circuit connections	Check contact quality	Micro-ohm level	High current (tens to thousands of amperes)
Insulation Resistance Tester	Insulating materials	Check insulation quality	Mega-ohms to giga-ohms	High DC voltage (commonly 500V – 5kV)

In simple terms:

Ground resistance: checks “how well you are connected to earth”
Loop resistance: checks “how good the circuit contact is”
Insulation resistance: checks “whether the insulation is reliable”

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equipamento de teste de alta tensão

Sistema de teste ressonante de alta tensão

Equipamento de testes do transformador

Calibrador da corrente elétrica

Equipamento de testes do óleo do transformador

Localizador subterrâneo da distância da falha do cabo

Medidor da resistência de contato

Analisador do interruptor

Analisador de gás SF6

Verificador da proteção do relé

Verificador da isolação da terra

Analisador do CT pinta

Analisador da qualidade do poder

Equipamento de teste do prendedor de relâmpago

equipamento de teste da descarga da carga da bateria

Verificador atual elétrico

equipamento de teste de alta tensão

Sistema de teste ressonante de alta tensão

Equipamento de testes do transformador

Calibrador da corrente elétrica

Equipamento de testes do óleo do transformador

Localizador subterrâneo da distância da falha do cabo

Medidor da resistência de contato

Analisador do interruptor

Analisador de gás SF6

Verificador da proteção do relé

Verificador da isolação da terra

Analisador do CT pinta

Analisador da qualidade do poder

Equipamento de teste do prendedor de relâmpago

equipamento de teste da descarga da carga da bateria

Verificador atual elétrico

How to Distinguish and Select: Ground Resistance, Loop Resistance, and Insulation Resistance Testers?

2.Loop Resistance Tester

3.Insulation Resistance Tester (commonly called “Vibrometer”)

Notícia

Casos

equipamento de teste de alta tensão

Sistema de teste ressonante de alta tensão

Equipamento de testes do transformador

Calibrador da corrente elétrica

Equipamento de testes do óleo do transformador

Localizador subterrâneo da distância da falha do cabo