1. Maintenance and testing of power systems

• High voltage switchgear contact resistance test:

• Accurate measurement of circuit breakers, isolating switches, and GIS (gas insulated switchgear)Contact resistance of dynamic and static contactsEnsure good contact and prevent overheating, arcing, and even explosions caused by poor contact (commonly used by institutions such as French power company EDF).

• Evaluate the resistance values of busbar connection points, cable joints, and grounding bar connections, and identify potential hazards caused by looseness and corrosion.

• Transformer and reactor testing:

• Diagnose winding inter turn short circuit, wire breakage, and poor welding.

• Check the contact status of each gear of the tap changer.

• Perform three-phase resistance balance analysis (strictly required by French and European standards such as IEC 60076).

• Measuring the high and low voltage windings of transformersDC resistance (DCR), used for:

• Generator/Large Motor Maintenance:

• Detect the DC resistance of stator and rotor windings, diagnose conductor integrity and connection point issues (such as power plants and large industrial motors).

2. Rail transit (core application areas in France and Europe)

• Inspection of key components of traction system:

• Pantograph contact resistance:Measure the dynamic contact point resistance (simulated or static test) between the pantograph slide and the contact wire to ensure efficient current collection and reduce arc wear.

• Grounding system for rail vehicles:Detect the grounding connection resistance between the vehicle body and bogie, as well as between the wheelset and track, to ensure safe discharge of lightning and fault currents (in accordance with railway safety standards such as EN 50122).

• High voltage cables and connectors:Regularly check the connection resistance of high-voltage cables and terminals in the traction system to prevent overheating faults.

• Track circuit and signal system:

• Measure the resistance of rail connection lines and welding points (aluminum thermal welding, flash welding) to ensure signal transmission integrity.

3. Aerospace and Defense (High Reliability Requirements)

• Aircraft/spacecraft electrical system:

• Test key parts such as engines, landing gear, wings, etcBonding ResistanceEnsure good electrical connections between metal components, prevent static electricity accumulation, lightning damage, and electromagnetic interference (in accordance with manufacturer specifications such as Airbus).

• Check the connection quality of the grounding circuit and wire harness termination points of the avionics equipment.

• Military equipment:Contact resistance and grounding integrity testing of electrical systems in ships and armored vehicles.

4. New energy facilities

• Wind power generation:

• Measure the resistance of the generator winding, the grounding connection of the tower, and the contact resistance of the busbar and circuit breaker inside the inverter cabinet.

• Solar power station:

• Check the connection points and circuit breaker contact resistance inside the DC side combiner box and junction box to prevent the risk of DC arc.

5. Industrial manufacturing and quality control

• Welding process evaluation:Accurately measure pipelines, steel structures, car bodies, etcWelding point resistanceIndirectly reflecting welding penetration and porosity defects (especially used in the automotive and pressure vessel industries).

• Conductor material inspection:Measure the DC resistance of cables, bus ducts, and conductive components to verify the conductivity of materials (in accordance with NF and IEC standards).

• Key equipment inspection:Preventive resistance testing is conducted on large motors, frequency converters, and medium and low voltage switchgear in steel and chemical plants.

The core advantage of AOIP micro ohmmeter (enhancing application reliability)

1. Accurate compliance:

• comply withNF (French National Standard), IEC (International Electrotechnical Commission), EN (European Standard)Strict requirements such as IEC 62464 for resistance testing of medical equipment.

2. Anti interference design:

• adoptFour wire Kelvin measurement method+High test current (1A~100A+)Effectively suppress electromagnetic interference and thermoelectric potential effects in industrial sites.

3. Durable and portable:

• Specially designed for European industrial environments, with high protection levels (such as IP65), suitable for use in harsh conditions such as substations, tracksides, shipyards, etc.

4. Intelligent functions:

• Data storage/export, automatic temperature compensation, comparison alarm function, improve detection efficiency (especially suitable for places such as French nuclear power that require strict record tracing).

5. Security certification:

• Through CAT III/CAT IV high-voltage safety level certification, ensure the safety of operators near live environments.

Typical application cases

• EDF nuclear power plants in France:Regularly check the winding resistance of the main transformer and the contact resistance of the high-voltage switch using an AOIP micro ohmmeter.

• SNCF TGV Maintenance Center:Conduct resistance tests on the pantograph, traction motor winding, and carriage grounding system.

• Airbus production line:Measure the lap resistance of the aircraft fuselage to ensure electromagnetic compatibility and lightning protection safety.

• Schneider Electric (France):Used for factory contact resistance quality inspection of medium and low voltage switchgear.