IEEE C37.302-2015 pdf free
IEEE C37.302-2015 pdf free.IEEE Guide for Fault Current Limiter (FCL) Testing of FCLs Rated above 1000VAC.
transieitt fault current lintitation voltage (TLV) : The fault current limitation voltage during the time in which it has a significant transient component, it may be oscillatory or non-oscillatory or a combination of these depending on the characteristics of the circuit and the FCL.
33 Definitions related to prospective short-circuit currents
For FCLs, two prospective short-circuit current values are defined.
niaximuin prospeethe short-circuit current: The maximum prospective fault current tiir which the FCL has been designed. The two aspects are:
peak short-circuit current, and
symmetrical short-circuit mis current.
NOTE—The maximum syninwlncal fault current may riot be the most critical current for testing some RI. tcchnologics The most critical value should be discussed between the user and manufacturer.
minimum prospective short-circuit current for CCL transition: The minimum prospective fault current for which the FCL is designed to transition out of C mode.
NOTE—The minimum symmetrical fault current for (‘CL Iransition might not be the most critical current for testing some FCI. technologies. The most critical value should be discussed behveen the user and manufacturer.
3.4 Definitions related to initiation of CCL transition
The CCL transition may be initiated by current magnitude, rate-of-current rise, external initiation signal, or other quantities.
CCL initiation criteria: The quantity which causes the CCL transition.
NOTE For purposes of this testing guide, initiation criteria based on current, on rate-of-current rise, and on external initiation signals are considered. ‘The user is invited to discuss testing of any other type of CCL initiation criterion with the manufacturer.
CCL initiation current: The instantaneous value of current which will initiate the CCL transition. It may need to be considered in combination with rate-of-current rise.
CCL initiation delay: The time delay from fault inception to reach the initiation criteria.
NOTE—Cd initiation delay is a measured value of the test waveform or of the external initiation signal, not a characteristic of the FCL. ‘The initiation delay includes system effects such as the time it takes the system fault current waveform to reach Linitiation conditions. The user is in’icd to consider that short-circuit conditions may arise at any time in the waveform. Therefore the measurements should include the point on the prnspectivc fault current was dunn when the short-circuit conditions are imposed and the time constant is of the prospective fault current. Accurately measuring this delay may be difficult for some FCLs.
CCL initiation rate-of-current rise: The initiation rate-of-current rise (i.e.. gradient), is the rate-of-current rise which will initiate the CCL transition, It may need to be considered in combination with initiation current.
3.5 Definitions related to currents without limitation by an FCL
This clause pertains to currents at levels above the rated continuous current that do not meet the initiation criteria of an FCL
branch short-time withstand current: The rms value of the current that a specific branch of the FCL can carry in the C mode, evaluated during the first- and last three full half-cycles under prescribed conditions of use and behavior without limitation by the FCL.
NOTE—The branch ID number is denoted by the value of the subscript “n”.
peak withstand branch current: The peak current associated with the first major loop of the short-time withstand current that a specific branch of the FC’L can carry in the Cmode.IEEE C37.302 pdf download.
