IEEE Std C57.12.31-2020 pdf download
IEEE Std C57.12.31-2020 pdf download.IEEE Standard for Pole-Mounted Equipment一Enclosure Integrity.
conformance tests: Certain performance tests are conducted to demonstrate compliance with the applicable standards. The test specimen is normally subjected to all planned routine tests prior to initiation of the conformance test program.
NOTE- -The conformance tests may, or may not, be similar to certain design tests. Demonstration of margins (capabilities)
beyond the standard requirements is unnecessary.
design tests: Tests made by the manufacturer to determine the adequacy of the design of a particular type or model of equipment or its component parts to meet its assigned ratings and to operate satisfactorily under normal conditions and under special conditions if specified. These tests may be used to demonstrate compliance with applicable standards of the industry .
NOTE- Design tests, sometimes called ype lests, are made on representative apparatus or prototypes to verify the validity of design analysis and calculation methods and to substantiate the ratings assigned to all other apparatus of basically the same design. These tests may also be used to evaluate the modification of a previous design and to verify that performance has not been adversely affected. Test data from previous similar designs may be used for current designs, where appropriate. Once made, the tests need not be repeated unless the design is changed so as to modify performance.
dry film thickness (of a coating): Thickness of any applied coating(s) measured after curing.
enclosure: The manufacturer supplied tank, cover, cover retention and integral components (like sealed bushings or overpressure devices) or other housing containing the electrical equipment, its insulating medium and internal components. The tank or housing includes permanent attachments such as weldments necessary for the proper handling, mounting, operation or upgrading of the equipment. This tank or other housing is typically located outdoors, above grade level, and not accessible to the general public, as some of its external components have high voltages during operation.
routine tests: Tests made for quality control by the manufacturer on every device or representative samples, or on parts or materials, as required to verify during production that the product meets the design specifications and applicable standards.
NOTE 1- -Certain quality assurance tests on identified critical parts of repetitive high-production devices may be tested on a planned statistical sampling basis.
NOTE 2- Routine tests are sometimes called production tests.
5.4 Coating system performance requirements
5.4.1 Cross hatch adhesion test
This test demonstrates proper adhesion of the coating system to the substrate.
One coated test panel, per Figurc 2, shall be scribed to bare substrate in accordance with ASTM D3359.7
Method A shall be used for films thicker than0. 13 mm (5 mil or 0.005 in). Method B shall be used for films less than or equal to0. 13 mm (5 mil or 0.005 in). There shall be 100% adhesion to the substrate and between layers.
A rating of 5A for Method A and 5B for Method B per ASTM D3359 is required.
5.4.2 Humidity test
This test evaluates the performance of the coating system under controlled condensation conditions.
Condensation may cause deterioration of the coating system impacting the useful service life of the equipment.
Two coated panels, per Figure 1, shall be tested for 1000 h in accordance with ASTM D4585, except that the test shall be conducted at 45°C+1 °C(113°F +2 °F). Upon completion of the test, panels shall be evaluated for the following:
a) Blistering- There shall be no blistering observed per ASTM D714 on the surface of the panels when inspected within 15 min after removal from the cabinet.
