Technical library

Measurement of the outer limits of the operating mechanism is required by international standards such IEEE C37 and as IEC 62271, when certifying a circuit breaker (CB). Some of those tests are valuable to repeat in field tests, obviously to ensure that the CB fulfil its design specification, but those tests and some additional tests in similar spirit can also disclose potential future problems. The most common is to vary the auxiliary voltage but it could also be other energy resources for example hydraulic and pneumatic pressure. This application note will focus of the auxiliary voltage, what the standard requires, sort out the terminology and what tests that are valuable to repeat in field tests.

The document explains what load curves are and why they are important.  

Electric power transmission and distribution systems are vital for modern life. And, since the electricity these systems provide is essential, then these systems are essential too. One of the less celebrated components of these systems is the humble surge arrester. These arresters serve the important job of keeping the electric supply smooth and steady. As such, these devices must be tested regularly as part of a maintenance program.This application note looks at what a surge arrestor is, the test procedures of insulation resistance testers, as well as present test results and recommendations.

For most of the breakers the MOM/DLRO is as accurate as other types of micro-ohmmeters but if there is a current transformer (CT) in series with the breaker contact to be tested then it is advisable to make some basic checks

To measure a low resistance connection could be a demanding task. If using an ordinary multimeter (DMM). It will make measurements of resistance values down to a tenth of an ohm.

This application note informs about how to perform testing of breakers with both sides grounded. Valid for both Mjölner 200 and Mjölner 600

This application note informs about testing of reclosers with ODEN/INGVAR (herafter only ODEN is mentioned, though the text is valid for both products).

This application note is about primary injection testing of low voltage (LV) circuit breakers (CB) with the primary test equipment ODEN or INGVAR (hereafter only ODEN is mentioned, though the text is valid for both products), and the challenges that could arise for various CB installations.

This application note is about primary injection testing low voltage (LV) circuit breakers (CB) using the High Current Probe HCP2000 probe (AA-90165). Current source can be the primary test equipment ODEN or INGVAR

This application note is about primary injection testing of low voltage (LV) circuit breakers (CB) with the primary test equipment ODEN or INGVAR (hereafter only ODEN is mentioned, though the text is valid for both products), and the challenges that could arise for various CB installations.