IEEE C37.3-1997 pdf download IEEE Standard Requirements for High- Voltage Switches
Overview
This standard applies to all high-yoltage enclosed indoor or outdoor, and non-enclosed indoor or outdoor, switchesrated in excess of 1000 V. This includes such switch types as disconnecting, selector, horn-gap, grounding, etc., formanual or power operation. The following switch types are not covered by this standard: distribution-enclosed, single-pole switches and distribution cutouts fitted with disconnecting blades; switches used in metal-enclosed gear coveredby IEEE Std C37.20.2-1993, IEEE Std C37.20.3-1987, and 1EEE Std C37.20.4-1996; and switches used in pad-mounted switchgear covered by EEE Std C37.71-1984，ANSI C37.72-1987, and PC37.73 (Draft 8, Feb. 95).
NOTE- PC37.39,Proposed Standard for Interrupter Switches, is currently under development. Upon its approval andpublication, all references to interrupter switches in this standard will be superseded.
This standard defines terms and words that uniquely apply to high-voltage switches and are not included in IEEE StdC37.100-1992. It also defines terms used for rating high-voltage switches and ratings that must be included onnameplates for high-voltage switches.
2.References
ANSI C37.32-1990, American National Standard for Switchgear–High-Voltage Air Switches, Bus Supports, andSwitch Accessories–Schedules of Preferred Ratings, Manufacturing Specifications, and Application Guide.
IEEE Std C37.34-1994,IEEE Standard Test Code for High-Voltage Air Switches (ANSI).
IEEE Std C37.36b-1990 (Reaff 1996), IEEE Guide to Current Interruption with Horn-Gap Air Switches (ANSI).
IEEE Std C37.37-1996,IEEE Standard Loading Guide for AC High-Voltage Air Switches (in Excess of 1000 volts)(ANSI.
NEMA SG 6-1995Power Switching Equipment.
3. Definitions
For definitions. see IEEE Std C37,100-1992. 1EEE Standard Definitions for Power Switchgear, The definitions oferms contained in this standard, or in other standards referred to in this standard. are not intended to embrace allegitimate meanings of the terms. They are applicable only to the subject treated in this standard.
3.1 rated making current: The maximum current that the switch shal be required to close (initiate) and carry undeispecified conditions.For transient currents, fault initiation, capacitive discharge, etc.. the rated making current shall bethe prospective current available from the circuit without the influence of the switching device.
4. Service conditions
4.1 Usual service conditions
High-voltage switches conforming to this standard shall be suitable for operation at or within their ratings, providedthat
a) The temperature of the cooling air (ambient temperature) is within the range of –30 °C to +40 °C.
b) The altitude does not exceed 1000 m (3300 ft).
c) The wind velocity does not exceed 37 m/s (80 mi/h).
NOTE — This wind velocity will produce a force of approximately 770 N/m 2 (16 lb/ft 2 ) of projected area on cylindrical surfaces
(see NEMA SG 6-1995).
4.2 Unusual service conditions
a) Equipment that depends on air for its insulating and cooling medium will have a higher temperature rise and a lower dielectric strength when operating at higher altitudes than when operating at lower altitudes.
b) For altitudes above 1000 m (3300 ft), correction factors should be applied to the switch ratings. Altitudecorrection factors are being developed.
c) Where other unusual conditions exist, they should be brought to the attention of those responsible for the design and application of the equipment. Examples of such conditions are:
1) Contamination, such as damaging fumes or vapors, excessive or abrasive dust, explosive mixtures of dust or gases, steam, or salt spray.
2) Abnormal vibration, shocks, earthquakes, or tilting.
3) Excessively high or low ambient temperatures.
4) Unusual transportation or storage conditions.
5) Unusual space limitations.
6) Unusual operating duty, frequency of operation, difficulty of maintenance, poor current wave form,unbalanced voltage, special insulation requirements, etc.
IEEE C37.3-1997 pdf download
PS:Thank you for your support!
