IEEE C37.100.2-2018 pdf free.IEEE Standard for Common Requirements for Testing of AC Capacitive Current Switching Devices over 1000 V.
The tests in this standard are designed to be used by other standards to demonstrate a capabiliiy of a particular device to switch capacitive circuits. Not all devices need be ieted to all of the tests in this standard. Any device can he qualified for any given capacitive circuit in this standard with no requirement to pertbm’i (he other tests. The capacnive current switching abilities of a device shall be stated in terms of (he raings given in 4.2.
4.2 Ratings and applicability
4.2.1 Rated capacitive switching current
The rated capacitive switching current is the rrns symmetrical value of the capacitive load current that a device is required to make and break under specified ratings.
4.2.2 Rated maximum voltage () or (Ur)
The rated maximum voltage indicates the upper limit of the highest voltage of systems for which the capacitive current switching device is intended.
4.2.3 Rated power frequency (1)
The preferred values of the rated power frequency are 50 lIz and 60 Hz.
4.2.4 Rated application grounding condition
The rated application grounding condition is the connection made between the neutral of a wye.connected capacitor bank and the ground, The connection is typically referred to as ‘grounded or ungrounded’. A capacitor bank neutral grounded with a high impedance, such as a potential transformer or voltage divider. is considered to be ungrounded. A delta-connected bank is ungrounded.
4.2.5 Simultaneous or non-simultaneous operation
the electrical stresses on a switching de ie. and thus the probability of restrike or tiashover vary according to the degree of pole synchronicity in breaking operations. For the purposes of capacitive switching performance. devices are rated for simultaneous or non-simultaneous operation as follows:
Sintultaneous operation: An opcration in which the time interval in electrical degrees between the first capacitive current switching device pole contact and the final pole contact to mechanically close or open is equal to or less than 90 electrical degrees.
Non-simultaneous operation: An operation in which the time interval in electrical degrees between the tirst capacitive current switching device pole contact and the final pole contact to mechanically close or open is greater than 90 degrees.
4.2.6 Rated restrike performance
The following three classes of capacitive current switching devices are defined according to their restrike performance:
a) Class C2: Very low probability of restrike during capacitive current breaking as demonstrated by specific tests (Table 3 or Table 5).
b) Class Cl: Low probability of restrike during capacitive current breaking as demonstrated by specific tests (Table 4 or Table 5).
c) Class (‘0: Unspecified probability of restrike during capacitive current breaking.
4.2.6.1 ApplicabIlity of rated restrike performance
Tests are conducted to demonstrate the rated probability of restrike at or below the following capacitive switching currents. Various product standards refer to these values as rated values.IEEE C37.100.2 pdf download.