IEEE C37.46-2000 pdf download
IEEE C37.46-2000 pdf download.American National Standard for For Hiah Voltage Expulsion and Current-Limiting Type Power Class Fuses and Fuse Disconnecting Switches.
The preferred rated maximum voltages for designs of power class fuse supports, fuse disconnecting switches, fuse units, refill units, and fuse links now being manufactured and in use shall be 2.8, 5.5, 8.3, 15.5, 17.0, 17.2, 25.8, 38.0, 48.3, 72.5, 121.0, 145.0, and 169.0 kV. Presently some “R” rated fuses have maximum voltages of 2.54 or 5.08(5.1) kV and some indoor fuses and disconnecting switches are rated 15.0 kV maximum.
The rated voltage of a power class fuse support and a fuse disconnecting switch shall correspond to the rated voltage of either the fuse unit or the supporting insulator unit, whichever is lower.
3.3.2 Rated Continuous Current For Power Class Fuse Supports and Fuse Disconnecting Switches
The preferred rated continuous current for power class fuse supports and fuse disconnecting switches shall be 10, 25, 100, 200, 300, 400, 450, 600, 700 and 720 amperes.
3.3.3 Rated Continuous Current For Power Class Fuse Units, Refill Units, and Fuse Links
The preferred rated continuous current for power class fuse units, refill units, and fuse links shall be 0.5, 1, 2, 3, 5, 7, 10, 15, 20, 25, 30, 40, 50, 65, 80, 100, 125, 150, 200, 250, 300 and 400 amperes.
“R’ rated fuses are designated by the use of an R number and are not assigned a rated continuous current. Table 10 specifies the minimum allowable continuous current for each R rating at two ambient temperature conditions.
3.3.4 Rated Frequency
The preferred rated frequency for power class fuses shall be 50 Hz, 60 Hz, or both.
3.3.5 Rated Interrupting [Breaking] Current
The preferred rated maximum symmetrical interrupting currents of power class fuses in rms kiloamperes shall be in accordance with Table 1.
3.3.6 Rated Minimum Interrupting [Breaking] Current for Backup Current-Limiting Fuses
The rated minimum interrupting current for backup current-limiting power class fuses shall be designated by the manufacturer.
3.3.7 Rated Maximum Application Temperature [Rated Maximum Reference Ambient Temperature]
The rated maximum application temperature (rated maximum reference ambient temperature) is the maximum ambient temperature at which the device is suitable for use. The device must be capable of withstanding this temperature without any deterioration that would inhibit its ability to properly interrupt the circuit. The minimum rating allowable is 40°C. The rated maximum application temperature of the device in degrees C shall be preferably selected from the R20 series of preferred numbers (typically 40, 45, 50, 56, 63, 71 etc.). The R20 series is comprised of the numbers 1, 1.12, 1.25, 1.40, 1.60, 1.80, 2.00, 2.24,
2.50, 2.80, 3.15, 3.55, 4.00, 4.50, 5.00, 5.60, 6.3, 7.10, 8.00, 9.00 and their multiples of 10.
3.3.8 Basic Impulse Insulation Level (BIL)
The preferred basic impulse insulation level of power class fuses shall be as specified in Table 2.
3.3.9 Power Class Fuse Performance Requirements
The preferred performance requirements of power class fuse supports and fuse disconnecting switches shall include:
a) Power-frequency dry-withstand voltages for outdoor and indoor power class fuses, as specified in clause 4.1.
b) Power-frequency wet-withstand voltages for outdoor power class fuses, as specified in clause 4.1.
c) Power-frequency dew-withstand voltages for indoor power class fuses used in fuse enclosure packages (FEP) as specified in clause 4.1.
d) Impulse withstand voltages for outdoor and indoor power class fuses, as specified in clause 4.1
e) Temperature Rise limitations as specified in clause 4.4.
f) Radio-influence voltage, as specified in clause 4.3.
3.3.9.2 Performance Requirements of Fuse Units, Refill Units, and Fuse Links For Power Class Fuses
The performance requirements of fuse units, refill units, and fuse links for power class fuses shall include:
a) Melting [pre-arcing] time-current characteristic. Time-current-characteristic requirements specified in clause 5 and determined as specified in clause 4.5.
b) Total clearing-time-current characteristics, determined as specified in clause 4.5.
c) Maximum peak overvoltages for current limiting fuses determined as specified in clause 4.2.2.
d) Peak let-through [cut-off] current characteristics, for current-limiting fuses, determined as specified in clause 4.2.3.
3.3.10 Ratings and Performance Requirements Other Than Preferred
Special circuit or environmental conditions may require devices with ratings or performance requirements that are different from the preferred values specified above. For these devices the ratings and the performance requirements shall be agreed upon by the user and the manufacturer.
4 Design Test Requirements
4.1 Dielectric Tests
4.1.1 Outdoor Power Class Fuses
Outdoor power class fuses shall be capable of withstanding the test voltages specified in table 3 when tested as specified in clause 5 of ANSI/IEEE C37.41.
