The power frequency withstand voltage test transformer (power frequency voltage withstand test device) is a light high voltage withstand voltage test equipment produced based on the original similar products after a lot of improvement according to the "test transformer" standard of the Ministry of mechanical and electrical engineering. It is suitable for power frequency withstand voltage test of various high-voltage electrical equipment, electrical components and insulation materials in the fields of electric power, wire and cable, industrial and mining enterprises, scientific research, etcTest and DC leakage test are indispensable instruments in high voltage test.
YDJ power frequency AC / DC withstand voltage test device is composed of voltage regulating console and oil immersed high-voltage test transformer. The power frequency power supply is input to the operation box (or operation table), and the voltage is regulated by the auto voltage regulator to the primary winding of the test transformer, so that the power frequency high voltage can be obtained in the secondary (high voltage side) winding.This power frequency high-voltage AC can obtain high-voltage direct current after rectifying by high-voltage silicon stack and capacitor filtering, and its amplitude is 1.4 times of the effective value of power frequency high-voltage, but the short-circuit rod should be pulled out when using DC, and inserted into the short-circuit rod when using AC.
The high-voltage test transformer adopts single frame core structure. The low-voltage winding and the high-voltage winding are coaxial wound. The primary low-voltage winding is wound on the iron core, and the secondary high-voltage winding is outside. This coaxial arrangement reduces the leakage flux and increases the coupling between windings.The iron core of the test transformer is made of high-quality cold-rolled oriented silicon steel sheets, and the fastening method is steel as clamp.The high-voltage coil is a cylinder multi-layer tower structure, which is made of high-quality polyester enameled wire and high-voltage insulation materials. The overall structure of the product is compact, universal, easy to use and carry. The shell is made into octagonal structure with better matching with the device core. The overall appearance is beautiful and generous.
》Structure diagram of test transformer
1 - short circuit pole D 2 - equalizing ball 3 - high voltage bushing 4 - transformer handle
5-oil valve 6 ~ 7 - secondary pressure input a, x 8 ~ 9 - measuring terminals E and F
10 - grounding terminal of transformer shell 11 - high voltage tail x 12 - high voltage output a
13 high voltage silicon reactor 14 Transformer Oil 15 core
X and E are the input and output terminals of the transformer, and X and F are the test terminals.
Features and advantages of test transformer
1. In terms of insulation structure, according to the principle of "distance effect" of transformer oil, multi-level insulation is adopted to divide the internal insulation of transformer into multiple oil channels, so as to improve the insulation degree and reduce the volume;
2. The oil leakage problem of transformer is solved. Because the former transformer has no oil reservoir, when the temperature is too high, the oil will expand and leak out from the oil nozzle. In this series of products, the oil injection hole is set on the top of the casing, and the oil in the casing and the body of the transformer
Oil is interlinked.Therefore, the bushing not only has the functions of silicon stack, short circuit rod and series excitation rod, but also is equivalent to transformer oil reservoir;
3. This series of products adopts metal fixed lead and voltage equalizing, so as to eliminate the discharge phenomenon;
4. The fuel tank is compact in structure, novel in appearance, small in size and light in weight; the test transformer above 10KVA is equipped with movable iron wheel, which is easy to move.
5. The iron core is of single frame core type, which is composed of DQ type cold-rolled oriented silicon steel sheets of 0.30mm, which are fastened with new special materials instead of
Traditional core screw.The coil is concentric cylinder and multi-layer tower structure.
Specifications and parameters of test transformer
When purchasing, please clarify the following points:
1. Basic model, specification, capacity and quantity of transformer;
2. Primary and secondary voltage of transformer (input and output voltage);
3. When multiple voltages are required, the capacity distribution of each voltage and whether multiple groups of voltages are used at the same time shall be provided;
4. The appearance and size shall be subject to delivery. If the required size needs to be changed, it must be explained when ordering.
Note: if the user has special requirements, our company can design and manufacture for you.