IEEE C57.19.00-1991 pdf free

04-29-2021 comment

IEEE C57.19.00-1991 pdf free.IEEE Standard General Requirements and Test Procedure for Outdoor Power Apparatus Bushings.
IEEE C57.19.00 During the cantilever test, the bushing internal pressure (gauge) shall be 69 kPa(10 1bin2).The temperature shall be approximately 25 C.The specified load shall (see Table 8 in IEEEC57.19.01-1991 [5) be applied for a period of 1 min. Permanent deformation, measured at thebottom end 1 min after removal of the load, shall not exceed 0.76 mm(0.03 in).There shall beno leakage at either end at any time during the test or within 10 min after removal of theload.
Thermal Tests. Thermal tests shall apply to bottom-connected bushings only. Thebushing shall be tested in the following manner:
(1)The connections to the bushings shall be made in such a manner that they will not appreciably affect the bushing temperature rise. The lower end of the bushing shall beimmersed to the oil level required in 5.4.1 at test ambient temperature.
(2) Rated continuous current at rated frequency shall be applied continuously until thermal conditions become constant or until the measured temperatures do not increase bymore than 1 °C for 2 h for bushings up ihru 900kV BIL and not more than 1 C for 4hfor bushings 1050kV BIL and above.Operating voltage need not be applied during thetest.
(3)The temperatures during the test shall be measured with thermocouples in sufficient number to detect the hottest part. The temperature of the hottest point on the condue-tor of the bushing shall be determined by thermocouples soldered or suitably fixedalong the length of the conductor or imbedded in the insulation.
(4)The ambient temperature shaii be determined as that of the surrounding air by taking the average reading of three therrnometers,placed at least 610 mm(2 ft) away fromany part of the bushing on test. The thermometers shall be located at heights corre-sponding to the mounting flange,midpoint, and top end of the bushing. The temperature of the surrounding air shall not be less than 10 C nor more than 40C.Nocorrections for variations of the ambient temperature within this range shall beapplied.
(5) The temperature of the lower end (oil bath)shall be measured by a thermocouple immersed approximately 50 mm(2 in) below the oil surface and located approximately150 mm (6 in) from the surface of the bushing.
(6)Requirements, as outlined in 5.4.1, shall be fulfilled or the bushing shall be considered to have failed.IEEE C57.19.00 pdf download.

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