IEEE 1277-2020 pdf free download

IEEE 1277-2020 pdf free download.IEEE Standard General Requirements and Test Code for Dry-Type and Oil-Immersed Smoothing Reactors and for Dry-Type Converter Reactors for DC Power Transmission.
12.4.4.5 Temperature-rise test by temperature Indicating device
When temperature rise tests by temperature-indicating devices (thermocouple, thermal sensor. etc.) arc required. place at least one temperature indicating device in each winding group, so that it is in contact with the coil winding. It is important that (he temperature indicating devices be placed in the cooling air ducts in such a manner as to indicate the winding temperature without restriction of the ventilation. Once the temperature rise has become constant, the test voltage and current should be removed. Immediately thereafler. the coil temperature indicating devices, and any other temperature indicating devices, should be read continually in rotation until the temperature begins to falL If any of the temperature indicating device temperatures are higher than those observed during the run, the highest temperature should be recorded as the final temperature reading.
If the reactor is fitted (supplied) with top hats, enclosures, electrostatic shields (dummy package), or any other type of passive mitigation geometry, for example for sound-suppression purposes. the complete assembly shall be installed for the temperature rise test. If sound mitigation treatment (shielding) is a possible field installed option, consideration should be given to simulating its effect during the temperature rise test.
12.4.4.6 Measurement of hot spot
Since hot spot determines service life, the measurement of hot spot during the heat run type test is imporant. Dry-type air-core reactors usually employ ftilly encapsulated windings. Therefore, direct access to the winding is not possible for the measurement of hot-spot temperatures during the heat run test. However, it is possible to measure winding surface temperature with some degree of accuracy. Such winding surface temperature measurements arc essentially a measurement of winding hot spot due to the fact that the winding encapsulation medium is thin compared to the winding conductor cross section.
Winding hot spot can be measured using thermometers. thermocouples. or fiber-optic probes. In all cases, the method for fixing of the temperature-measuring device to the surface of the winding is extremely critical. Silicone rubber sealant compound or similarly based adhesive systems offer the best performance due to their bonding capabilities at high temperatures and thermal insulating properties. The amount of silicone rubber sealant used is important. Sufficient material should be employed to bond the thermometer bulb to the surface in such a manner that the bulb registers only surface temperature and not air temperature. The same holds true for thermocouples or fiber-optic probes.IEEE 1277-2020 pdf free download.