Many circuit breakers are tested by use of secondary injection test equipment applied to the breaker’s trip unit. These specialty test sets check the trip function of the circuit breaker — in other words, whether the electronics in the breaker are functioning properly. When you have work requirements that involve testing and maintaining Merlin Gerin circuit breakers, the Merlin Gerin Secondary Injection Test Set is ideal for verifying the proper operation of the trip circuitry. Merlin Gerin is only one of several well-known brands in the Protec stable of test equipment rental.
Regular testing and maintenance of circuit breakers and relays is essential when dealing with sophisticated electrical systems.
For checking circuit breaker and protective relay systems, the secondary injection test set is an essential piece of electrical test equipment for companies to use. It differs from the standard primary injection testing method in that it does not require high current to be passed through the primary current path, but rather tests the breaker as a result of low level signals sent directly to the solid state trip device that controls the operation of the breaker.
A contact resistance test (also known as a ductor test) measures the resistance of electrical connections such as joints, terminations and connectors. These can be connections between any two conductors, for instance busbar sections or cable connections. The test measures the resistance at the micro- or milli-ohm level and is used primarily to verify that electrical connections are made properly, and can detect the following problems:
With the critical role that protective relays play in arresting and isolating electrical faults, it is extremely important to know that they are operating in concert with their design and intent. The unplanned downtime and damages associated with the mis-operation of protective devices during fault conditions can be incredibly detrimental. Regular maintenance testing allows the discovery and resolution of such issues before they are able to escalate into very costly problems.
Can't find what you are looking for here? Be sure to checkout the entire Protec Resource Blog Archive.