What is Contact Resistance Meter? Why we are using?

 A Contact Resistance Meter is a switching device that is used to interrupt the irregular or fault current. The circuit breaker's primary purpose is to close or open an electrical circuit, protecting the electrical system during the running process. 


Contact Resistance Meter measures the resistivity of electrical contact between the circuit breaker and insulators. To make sure the circuit breaker is in good shape and working properly, the contacts must be inspected from time to time. Contacts that have been neglected or damaged may arc, lose phase, or even catch fire.



Why Is Contact Resistance Meter Testing Important? 


The contact resistance shows the resistance of the circuit breaker, isolator, and bus bar.   To know about the overall functionality of your circuits, you will need to check the circuit resistance periodically. The contacts that have been ignored are usually responsible for loose phase and catching fire.


 Contact resistance meter helps you to  primarily check that electrical connections are secure and measures resistance at the micro- or milli-ohm level. It is crucial for connections that carry a lot of currents since a higher contact resistance reduces current carrying capacity and increases I2R losses.


How Contact Resistance Meter Testing Done? 


There are two checks usually conducted on the contacts of the circuit breakers visual inspection check and the other one is contact resistance check: 


Visual Inspection 


  • To calculate the value of the resistance the Ohm’s law is used. The manufacturer's value is odd to the resistance value.  The visual inspection check covers examining the circuit breaker's contacts for any arcing-related pitting marks that damaged or deformed contacts.


Contact Resistance 


  • The measurement of contact resistance serves as the second check. Contact resistance entails passing a constant current through the contacts—typically 100, 200, or 300 A—while measuring the voltage drop across it. A unique contact resistance measuring device used to test the instruments. Ohm's law is used to calculate the value of the resistance. The manufacturer's value is odd to the resistance value. Additionally, the value needs to be compared to earlier data. To get the accurate value resistance meter with advance specifications offered by Contact Resistance Meter Manufacturers in India for secure win. 


These two exams must be conducted simultaneously. As there are instances of contacts that are damaged but have good contact resistance. A good contact resistance and passing the visual inspection test are therefore required for a contact to be certified as good.


Ductor Testing 


Ductor testers are divided into two categories:


  • Four resistors, internal battery voltage E, and output terminals A and B are present in a series type ohmmeter. The battery creates the direct series circuit when the R1 and R2 resistors are connected to  A and B terminals.  


  • Small amounts of current resistance are measured using an ohmmeter of the shunt type. The needle reads 0 when the A and B connections are closed because only the resistor RX receives current.Since there is no current flowing through the RX resistor when these two terminals are open, the reading on the ductor tester is recorded as infinite.


Maintaining constant measurement settings is crucial for the contact resistance test in order to compare results with those from the past and the future for trend analysis.


Final Words 


Contact resistance tests reveal the state of the contacts' health and their capacity to carry their rated current.So, to get higher specifications resistance keep in touch with S.B.ELECTROTECH. We are leading Contact Resistance Meter Suppliers In India that deal with the precise quality of circuit meters. Visit our website to know more about our products!! 


Location: 124, Sikdar Para Rd, Paschatya Para, Rajpur, Kolkata, West Bengal 700149, India

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