Low voltage molded case circuit breakers like the microprocessor-based SACE are often installed as protection devices for motors in industrial and commercial facilities. It is important to regularly check the condition of these devices because of the critical role that they have in protecting the electrical circuits that they are tasked with monitoring.READ MORE >>
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The protective devices that are used for the oversight and operational decision making in low voltage circuit breakers (LVCBs) are are often simply referred to as a Solid-State Trip device (SST). They are essentially protective relays that are frequently an integrated part of a low voltage circuit breaker and monitor the primary current path of the circuit breaker. In normal operation, these solid-state trip devices will sense changes in the primary current path and make the decision to open the circuit based on the magnitude and duration of the fluctuation.
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Secondary injection testing is a diagnostic method of determining if a secondary protective device will respond as expected in both normal and faulted conditions. This method of testing is conducted by injecting signals directly into the trip unit that controls that operation of the circuit breaker to which it is connected.
Since this type of operational testing is performed by injecting secondary signals into the device instead of using primary current levels, it is generally considered to be a safer method of verifying the proper operation of a circuit breaker. This method of testing can be performed on circuit breakers as a part of commissioning or preventive maintenance.READ MORE >>
Designed to perform secondary injection testing on the Static Trip III (STIII) overcurrent tripping system utilized on the RL breaker, the Siemens PTS-5 Secondary Injection Test Set, packaged in a self-contained case, contains a microprocessor controlled constant current source which enables rapid verification of the performance of the STIII.
Directly enter the desired test current on the numeric keypad for easy test configuration, and the self-contained, automatically controlled digital timer allows simple verification of the time-current tripping characteristics. The Siemens PTS-5 also provides a regulated DC voltage to allow functional testing of the tripping actuator.READ MORE >>
Circuit breakers are used in homes, office buildings, and electric facilities. These instruments are prone to break down as they gather moisture, contaminants, and dirt while in use. If not maintained regularly, ciruit breakers insulation becomes weak as a result of the heat that is created due to arc interruption. Chemicals like hydrogen sulphide or chlorine can also be major factors in the damage and corrosion of insulation as well as metal components of circuit breakers.READ MORE >>
When it’s necessary to test circuit breakers and protective relay systems, a secondary injection test set is the main piece of electrical test equipment companies utilize. Secondary injection testing differs from the standard primary injection testing method in that there is no current flowing and contacts remain closed during the testing process.READ MORE >>
Secondary current injection testing is performed on solid-state trip units using a specially designed power supply unit. However, the secondary injection method only tests the solid-state trip unit, and does not test the current sensors, wiring, or the breaker current handling components.READ MORE >>
The ABB Ekip Connect Secondary Injection Test Set is a software application for personal computers that interfaces with ABB low voltage circuit-breakers equipped with compatible protection releases.
The test set allows the releases to be configured, monitored, controlled and tested. Ekip Connect can connect to the releases in the point-to-point or network modes, and connection is made using the front test connector or to communication modules installed on the circuit-breaker.READ MORE >>