The ultra-low frequency high voltage generator has a very wide range of applications in the field of power testing. It is mainly used for power frequency withstand voltage tests on large generators, cables, and other test objects. Due to its small size and relatively light weight, it is a power testing instrument favored by power workers. Taking the YTC1104 ultra-low frequency high voltage generator as an example, this article briefly introduces the working principle and wiring method of the ultra-low frequency high voltage generator.
Wiring description: Connect the two dedicated wires and the grounding wire provided with this product according to the method shown in Figure 4. Connect the power socket to a 50Hz/220V AC power supply using the power cord.
The ultra-low frequency insulation withstand voltage test is actually an alternative method to the power frequency withstand voltage test. As we know, when conducting power frequency withstand voltage tests on large generators, cables, and other test objects, due to their insulation layers having a relatively large capacitance, a test transformer or resonant transformer with a large capacity is required. Such huge equipment is not only bulky and expensive but also very inconvenient to use. To solve this contradiction, the power sector has adopted a method of reducing the test frequency, thereby reducing the capacity of the test power supply.
Years of theory and practice at home and abroad have proven that using 0.1Hz ultra-low frequency withstand voltage tests instead of power frequency withstand voltage tests not only provides the same equivalence but also greatly reduces the size and weight of the equipment. Theoretically, the capacity is about one five-hundredth of that of the power frequency test. The test procedure is greatly simplified, and it has more advantages compared to the power frequency test. This is why developed countries commonly adopt this method. The Ministry of Electric Power of China has commissioned the Wuhan High Voltage Research Institute to draft the industry standard "Test Method for Ultra-Low Frequency (0.1Hz) Withstand Voltage of 35kV and Below Cross-linked Polyethylene Insulated Power Cables." China is promoting this method, and this instrument is developed based on this national need. It can be widely used in AC withstand voltage tests for cables, large high-voltage rotating motors, and power capacitors.
Schematic diagram of the controller panel of the ultra-low frequency high voltage generator:
Schematic and function description of each component:
(1) "Ground": Grounding terminal, connect to the earth when in use.
(2) "Output": Output multi-core socket, connect to the input multi-core socket of the booster body when in use.
(3) "Contrast": Contrast adjustment knob, used to adjust the contrast of the LCD display.
(4) "Function Keys": Their functions are indicated by the corresponding positions in the prompt bar on the display.
(5) "AC220V": Power input socket, with built-in fuse.
(6) "Switch": Power switch. Built-in indicator light, lights up when on, goes out when off.
(7) "Printer": Prints test reports.
(8) "LCD Display": Displays test data and output waveform.
The working principles of different ultra-low frequency high voltage generators are generally the same. The main differences are slight variations in the panel and operation methods. In actual work, power workers need to first thoroughly read the product operation manual, then perform the corresponding operations to avoid accidents.
