Large generators pressure test

Large generator DC voltage test with a lightweight test equipment, while the advantages of measuring the leakage current changes due to the different test results, in the DC voltage insulated internal voltage distribution power frequency AC voltage test and DC voltage can not betest instead. In this connection, we would like to adopt a new test method instead of the power frequency AC voltage test, the test proved the test voltage of 0.1 Hz frequency should be chosen. Compare it with the power frequency of 50 Hz, the test transformer capacity of only 1/500. 0.1 Hz AC voltage insulation internal voltage capacitor distribution is in line with the 50 Hz power frequency AC voltage operation. 0.1 Hz ultra-low frequency withstand voltage test DC voltage test of a good advantages.

As early as the early 1960s, some people abroad began to study the high-voltage motors commonly used insulation in the ultra-low frequency dielectric properties studied select a new test frequency, then made the 0.1 Hz. Preliminary study produce ultra-low frequency method For insulating properties. After comparing the home such as the United States, Japan, France, Sweden, the Soviet Union and other countries have been studied generator insulation, the focus of most of the emphasis on equivalence coefficient and test equipment improved. Further expand the study the characteristics of the cable under the ultra-low frequency, to study the applicability of the cables, capacitors and other test product. Since 1965 in some factory has begun trial ultra-low quite a pressure test as factory quality inspection test. Some run large generators are beginning to ultra-low frequency voltage withstand test face. In 1970 and for many years the central large generators of more than 150 ultra-low frequency test result is satisfactory. Combined with the current grid, as well as to prepare for future large generators put into test as well as a large capacity to solve the low-speed turbine generator pressure test test equipment. Conducted a preliminary exploration of ultra-low frequency voltage withstand test method. In the MEW scientific institutes and Xing'anjiang Hydroelectric assistance, the generator stator bar ultra-low frequency measured test today to explore issues related to a reference only.

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