IEEE C37.017-2010 pdf download

IEEE C37.017-2010 pdf download.IEEE Standard for Bushings for High- Voltage [over 1000 V (ac)] Circuit Breakers and Gas-Insulated Switchgear
4. Normal (usual) and special (unusual) service conditions
4.1 General
Clause 2 of IEEE Std C37.100.1-2007 applies.
4.2 Normal (usual) service conditions
4.2.1 Indoor application
Subclause 2.1.1 of IEEE Std C37.100.1-2007 applies. Many indoor applications do not require −30°C capability, and in these cases −5 °C, −15
°C, and −25 °C are common values that may be specified.
4.2.2 Outdoor application
Subclause 2.1.2 of IEEE Std C37.100.1-2007 applies.
4.3 Special (unusual) service conditions for both indoor and outdoor applications
4.3.1 Altitude
Subclause 2.2.1 of IEEE Std C37.100.1-2007 applies.
4.3.2 Exposure to excessive pollution
For installations in a location with polluted ambient air, 2.2.2 of IEEE Std C37.100.1-2007 applies.
4.3.3 Temperature and humidity
Subclause 2.2.3 of IEEE Std C37.100.1-2007 applies.
4.3.4 Exposure to abnormal vibration, shock, or tilting
Subclause 2.2.4 of IEEE Std C37.100.1-2007 applies.
4.3.5 Other special (unusual) service conditions
Subclause 2.2.5 of IEEE Std C37.100.1-2007 applies.
5. Ratings
5.1 General
The rating of a bushing shall meet or exceed the rating of the associated high-voltage circuit breaker or the gas-insulated switchgear, and the gas-insulated substation (GIS). The ratings of a bushing of the highvoltage circuit breaker or a GIS shall include the following:
a) Rated maximum system voltage (phase to phase, rms), U m
b) Rated voltage (line to ground, rms), U m /√3
c) Rated insulation level
d) Rated power frequency
e) Rated continuous current
f) Rated short-time withstand current
g) Rated peak withstand current
h) Rated duration of the short circuit
5.2 Rated maximum voltage
Subclause 4.1 of IEEE C37.100.1-2007 applies with the following additions:
⎯ Bushings for high-voltage circuit breakers shall meet the rated maximum voltage requirements of IEEE Std C37.06.
⎯ Bushings for the GIS rated above 52 kV shall meet the rated maximum voltage requirements of IEEE Std C37.122.
⎯ Bushings for the GIS rated 52 kV and below shall meet the rated maximum voltage requirements of IEEE PC37.122.2.
5.3 Rated insulation level
The rated insulation level of the bushing shall match the dielectric withstand levels in:
⎯ IEEE Std C37.06 for high-voltage circuit breaker bushings
⎯ IEEE Std C37.122 for GIS bushings rated above 52 kV
⎯ IEEE PC37.122.2 for GIS bushings rated 52 kV and below.
The insulation levels shall be met when the bushing is installed at the angle in which it will be mounted in the high-voltage circuit breaker or the GIS.
5.4 Rated power frequency
Subclause 4.3 of IEEE Std C37.100.1-2007 applies.
Other power frequencies such as 16-2/3 Hz and 25 Hz are special applications subject to agreement between the manufacturer and the user.
5.5 Rated continuous current and temperature rise
5.5.1 Rated continuous current
Subclause 4.4.1 of IEEE Std C37.100.1-2007 applies.
5.5.2 Temperature rise
Subclause 4.4.2 of IEEE Std C37.100.1-2007 applies.
The bushing terminal temperature shall not exceed 90 °C for bare terminals or 105 °C for silver surfaced,
tin surfaced, or equivalent terminals.
The overload capability of the bushing shall not be less than the overload capability of the equipment to
which it is applied.
5.6 Rated short-time withstand current
Subclause 4.5 of IEEE Std C37.100.1-2007 applies.
5.7 Rated peak withstand current Subclause
4.6 of IEEE Std C37.100.1-2007 applies with the following clarification. The rated peak withstand current corresponds to the rated closing and latching rating for the circuit breakers defined in IEEE Std C37.04.
5.8 Rated duration of short circuit Subclause 4.7 of IEEE Std C37.100.1-2007 applies with the following addition. The capability of the bushing to withstand the short time current shall be not less than the capability required of the equipment to which it is applied, or any other value agreed upon between the manufacturer and the user.
6. Design and construction
6.1 General The main component of the gas-insulated bushing is the hollow insulator made of ceramic material, glass, or composite material before metal fittings are attached.
The center conductors, top caps, and throat shields assembled to the hollow insulator shall be designed to satisfy the requirements of the high-voltage circuit breaker or GIS, where bushing assembly is intended for use. The design of all bushing parts should follow the specifications of IEEE Std C37.04 and IEEE Std C37.010 for application information on overloads and dielectric withstands. The bushing manufacturer shall calculate the maximum electrical field in the bushing and ensure that it does not exceed the maximum permissible electrical field within the polymeric material specified by the polymeric hollow core insulator manufacturer or the surface field strength that would cause a flashover along the external surface of the bushing.IEEE C37.017 pdf download.IEEE C37.017-2010 pdf downl