How do Primary & Secondary injection test sets work?.Another way to look at this is a primary injection test tests the breaker as close to a real-world scenario as you can while secondary injection tests the timing and function of the trip unit. The secondary injection test injects a ratio of the fault rated current of the breaker directly into the trip unit and measures how long it takes the breaker to trip. What is the difference between Primary & Secondary injection test?Ī primary injection test set injects a multiple of the fault rated current of the breaker, through the breaker while measuring the trip time.The different functions that are tested on the circuit breaker would be a long time and short time which are your overcurrent protection functions, instantaneous which is your short circuit protection, and your ground fault function which is your ground-fault current protection. The purpose of primary and secondary injection tests sets is to test the trip functions of breakers according to whether they are magnetic, thermal magnetic or digital.
What is the purpose of Primary & Secondary injection test set?.If the breaker does not trip within its calculated trip time, equipment downstream could be damaged more than expected. Another reason is to protect the equipment. If the breaker does not trip within its calculated trip time, it could cause a longer trip time and cause an arc flash damage to personnel and extended collateral damage to assets. One of the reasons is to protect personnel. Why do we use Primary & Secondary injection test sets?.Below Transworld Electric has shared five commonly asked questions about primary and secondary injection test. In the video above, Steve Spohnholz, Senior Electrical Systems Coordinator at Transworld Electric shares which test set best fits your circuit breaker testing needs and how both primary and secondary current injection tests are conducted to monitor the operation of a circuit breaker. Primary and second injection test are used to test a circuit breaker and its protective relays and devices. PRIMARY AND SECONDARY INJECTION TEST SETS
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