IEEE 592-2018 pdf free
IEEE 592-2018 pdf free.IEEE Standard for Insulation Shields on Medium-Voltage (15 kV- 35 kV) Cable Joints and Separable Connectors.
To comply with this standard, accessories shall sucessfully 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 2 or less when tested as specifed in 5.2.
b) Simulated touch current measurement: The maximum rms current passing to ground through a 1000 22 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 be 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. Ifa 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 of 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 effective rms 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.s An initial conductor temperature of 40 °C and the specified clearing time should be used when calculations are made per the ICEA standards.
5.2 Shield resistance test
The resistance of the semiconducting insulation shield shall be measured using the voltmeter-ammeter method, with either an ac (49 61 Hz) or de current supply. The current connections shall be as follows:
-For a separable insulated connector, the current connections shall be located on the shield at the cable entrance and at the farthest shield extremity, using a circumferential electrode at both locations to give a uniform current distribution.
-For a joint, the current connections shall be located on the shield at the cable entrance and at the center of the joint, using a circumferential electrode at both points to give a uniform current distribution.Alternatively, the measurement can be performed between the two cable entrances if the geometry of the joint at the physical center does not lend itself to easy installation of the circumferential electrode.In this case the pass criterion shall be a maximum value of 10000 2. IEEE 592 pdf free download.
