IEEE C37.23:2003 pdf free download

IEEE C37.23:2003 pdf free download.IEEE Standard for Metal- Enclosed Bus.
a) For isolated-phase and segregated-phase bus, between each phase and ground, with the other phases and the enclosure grounded.
h For dc bus, between each ungrounded conductor and ground, with the other ungrounded conductor (if any) and the enclosure grounded.
C) For other types of bus, between each phase and ground. rith the other phases and the enclosure grounded.
d) If ME bus includes disconnect switches or disconnect links, the open gap shall be tested with a value of voltage l0.o higher than that specified in Table I. Table 2. Table 3 and Table 4.
NOTE—For the test across the open gap of switches or links at I 0% higher voltage, an intermediate point of the voltage sowcc. may. if practicable. be connected to ground and to thc frame of the assembly in order th,it the voltage between any live part and the frame will not exceed that specified in Table I. Table 2. Table 3. and Table 4. If this is not practicable. the frame may be insulated from ground.
6.2.1.1 Power frequency withstand voltage tests
AC roltage shall have a crest value equal to 1.4 14 times the mis value specified in Table 1, Table 2, Table 3, and Table 4. The wave shape shall be essentially sinusoidal. The frequency shall be within ±20% of the rated power frequency. For dc bus assemblies, either the power frequency withstand voltage or the dc withstand voltage listed in Table 4 may be used. The test voltage is to be increased gradually from zero to reach the required test value within 60 s and shall be held at that value for I mm.
6.2t2 Lightning impulse withstand voltage tests
The lightning impulse withstand voltage test shall be conducted in accordance with IEEE Std C37.20.2- 1999, 6.2.1.2.
6.2.1.3 Test for bus bar insulation
Insulation applied to bus bar shall be tested in accordance with IEEE Std C37.20.2-l999. 6.2.1.3.
6.2.2 Continuous-current tests
Tests shall be conducted to demonstrate the ability of the bus assemblies to meet the temperature rise limitations specified in Table 5 while carrying rated continuous current. Temperature measurements shall be made in accordance with 6.2.2.3 and 6.2.2.4.
The bus assembly shall have a minimum enclosure length of 6 m. It shall have at least one joint (conductor and enclosure) per phase (bolted. clamped, or welded). Ends of the bus shall be sealed. The number of phases tested should be consistent with the number of phases of the application.