IEEE Std 592:2018 pdf download.IEEE Standard for Insulation Shields on Medium-Voltage(15 kV- 35 kV) Cable Joints and Separable Connectors.
IEEE Std 592 covers design tests for shield resistance, simulated touch current and a simulated fault-current initiation (hr insulation shields used on cable accessories, specifically 15 kV through 35 kV class joints and separable insulated connectors.
2. Normative references
The following referenced documents are indispensable for the application of this document (i.e., they must be understood and used, so each referenced document is cited in text and its relationship to this document is explained). For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments or corrigenda) applies.
ICEA P-32-382, Short Circuit Characteristics of Insulated Cable.
ICEA P-45-482, Short Circuit Performance of Metallic Shields and Sheaths on Insulated Cable.
IEEE Std 386TM, IEEE Standard for Separable Insulated Connector Systems for Power Distribution Systems Rated 2.5 kV through 35 kV.23
IEEE Std 404TM, IEEE Std, IEEE Standard for Extruded and Laminated Dielectric Shielded Cable Joints Rated 2500 V to 500 000 V.
3. Definitions
For the purposes of this document, the following terms and definitions apply. The IEEE Standards Diiiionarv O?lIiflL’ should he consulted for terms not defined in this clause.
family of accessories: Accessories of the same type and basic design, using the same insulation and conductive compounds and having identical insulation shield thickness.
nictallic housing/shield: A device that covers and provides contact with the insulation shield of the accessory body. It can be integral to the accessory, a requirement dictated by the manufacturer, or an optional component added by the end user.
4. Performance requirements
To comply with this standard, accessories shall successfully pass the following tests:
a) Shield resistance: The shield resistance measured between the cable entrance and the farthest extremity of the shield from the cable entrance shall be 5000 12 or less when tested as specified in 5.2.
b) Simulated touch current measurement: The maximum rms current passing to ground through a 100012 resistance when energized at the maximum voltage rating shall not exceed 1.0 mA, when tested as specified in 5.3.
c) Fault-current initiation: The accessory shall be capable of initiating two consecutive arcing faults to ground, when tested as specified in 5.4.
5. Test procedures
5.1 Test specimens
Test specimens shall he clean and dry. A minimum number of’two test specimens shall be subjected to each test. The cable outside diameter used for testing in 5.3 and 5.4 can influence the results. Using a larger cable outside diameter will expand the accessory more than a smaller outside diameter increasing the overall resistance of the particular accessory’s insulation shield creating a more severe test. Therefore, the outside diameter of the insulation of the cable utilized for the tests must be within the upper 25% of the accessory’s range. If a cable is not readily available in this range, additional material, such as tape, heat shrink tube(s) or cold shrink tube(s) may be used to increase the outside diameter.
a) Family 0/Accessories: When testing accessories belonging to a family, tests shall be performed on the specific size accessory in the family that has the highest shield resistance as measured in 5.2. In addition, the cable used for testing must meet the requirements specified above.
b) Test cable. The cable to be used in the test shall be of the same voltage class as the accessory tested and shall have a conductor and a metallic shield rated for the eflèctive mis value of the short time current to be applied during the test. The test cable shall not be smaller than a 1/0 aluminum, full neutral cable. The short circuit current carrying capacity of the metallic shield and phase conductor may be determined in accordance with ICEA P-45—482 and ICEA P-32—382, respectively.5 An initial conductor temperature of 400 and the specified clearing time should be used when calculations are made per the ICEA standards.IEEE Std 592 pdf download.